// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol";
import "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
import "@openzeppelin/contracts/proxy/transparent/ProxyAdmin.sol";
// Kept for backwards compatibility with older versions of Hardhat and Truffle plugins.
contract AdminUpgradeabilityProxy is TransparentUpgradeableProxy {
    constructor(address logic, address admin, bytes memory data) payable TransparentUpgradeableProxy(logic, admin, data) {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(address _logic, address admin_, bytes memory _data) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./TransparentUpgradeableProxy.sol";
import "../../access/Ownable.sol";
/**
 * @dev This is an auxiliary contract meant to be assigned as the admin of a {TransparentUpgradeableProxy}. For an
 * explanation of why you would want to use this see the documentation for {TransparentUpgradeableProxy}.
 */
contract ProxyAdmin is Ownable {
    /**
     * @dev Returns the current implementation of `proxy`.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function getProxyImplementation(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
        // We need to manually run the static call since the getter cannot be flagged as view
        // bytes4(keccak256("implementation()")) == 0x5c60da1b
        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"5c60da1b");
        require(success);
        return abi.decode(returndata, (address));
    }
    /**
     * @dev Returns the current admin of `proxy`.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function getProxyAdmin(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
        // We need to manually run the static call since the getter cannot be flagged as view
        // bytes4(keccak256("admin()")) == 0xf851a440
        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"f851a440");
        require(success);
        return abi.decode(returndata, (address));
    }
    /**
     * @dev Changes the admin of `proxy` to `newAdmin`.
     *
     * Requirements:
     *
     * - This contract must be the current admin of `proxy`.
     */
    function changeProxyAdmin(TransparentUpgradeableProxy proxy, address newAdmin) public virtual onlyOwner {
        proxy.changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrades `proxy` to `implementation`. See {TransparentUpgradeableProxy-upgradeTo}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgrade(TransparentUpgradeableProxy proxy, address implementation) public virtual onlyOwner {
        proxy.upgradeTo(implementation);
    }
    /**
     * @dev Upgrades `proxy` to `implementation` and calls a function on the new implementation. See
     * {TransparentUpgradeableProxy-upgradeToAndCall}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgradeAndCall(TransparentUpgradeableProxy proxy, address implementation, bytes memory data) public payable virtual onlyOwner {
        proxy.upgradeToAndCall{value: msg.value}(implementation, data);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(address newImplementation, bytes memory data, bool forceCall) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature(
                    "upgradeTo(address)",
                    oldImplementation
                )
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _setImplementation(newImplementation);
            emit Upgraded(newImplementation);
        }
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(
            Address.isContract(newBeacon),
            "ERC1967: new beacon is not a contract"
        );
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Upgrade.sol";
/**
 * @dev Base contract for building openzeppelin-upgrades compatible implementations for the {ERC1967Proxy}. It includes
 * publicly available upgrade functions that are called by the plugin and by the secure upgrade mechanism to verify
 * continuation of the upgradability.
 *
 * The {_authorizeUpgrade} function MUST be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is ERC1967Upgrade {
    function upgradeTo(address newImplementation) external virtual {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallSecure(newImplementation, bytes(""), false);
    }
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallSecure(newImplementation, data, true);
    }
    function _authorizeUpgrade(address newImplementation) internal virtual;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;
import "@openzeppelin/contracts/proxy/utils/UUPSUpgradeable.sol";
abstract contract Proxiable is UUPSUpgradeable {
    function _authorizeUpgrade(address newImplementation) internal override {
        _beforeUpgrade(newImplementation);
    }
    function _beforeUpgrade(address newImplementation) internal virtual;
}
contract ChildOfProxiable is Proxiable {
    function _beforeUpgrade(address newImplementation) internal virtual override {}
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol";
import "@chainlink/contracts/src/v0.8/VRFConsumerBaseV2.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import "./IWebaverseLand.sol";
/**
 *
 * @dev Inheritance details:
 *      ERC721            ERC721 token standard, imported from openzeppelin
 *      Pausable          Allows functions to be Paused, note that this contract includes the metadrop
 *                        time-limited pause, where the contract can only be paused for a defined time period.
 *                        Imported from openzeppelin.
 *      Ownable           Allow priviledged access to certain functions. Imported from openzeppelin.
 *      ERC721Burnable    Helper library for convenient burning of ERC721s. Imported from openzeppelin.
 *      VRFConsumerBaseV2   Chainlink RNG contract. Imported from chainlink.
 *
 */
contract WebaverseGenesisPass is
  ERC721,
  Pausable,
  Ownable,
  ERC721Burnable,
  VRFConsumerBaseV2
{
  using SafeERC20 for IERC20;
  using Strings for uint256;
  /**
   * @dev Chainlink config.
   */
  VRFCoordinatorV2Interface vrfCoordinator;
  uint64 vrfSubscriptionId;
  // The gas lane to use, which specifies the maximum gas price to bump to.
  // For a list of available gas lanes on each network,
  // see https://docs.chain.link/docs/vrf-contracts/#configurations
  bytes32 vrfKeyHash;
  // Depends on the number of requested values that you want sent to the
  // fulfillRandomWords() function. Storing each word costs about 20,000 gas,
  // so 100,000 is a safe default for this example contract. Test and adjust
  // this limit based on the network that you select, the size of the request,
  // and the processing of the callback request in the fulfillRandomWords()
  // function.
  uint32 vrfCallbackGasLimit = 150000;
  // The default is 3, but you can set this higher.
  uint16 vrfRequestConfirmations = 3;
  // Cannot exceed VRFCoordinatorV2.MAX_NUM_WORDS.
  uint32 vrfNumWords = 1;
  uint256 public immutable maxSupply;
  uint256 public immutable numberOfCommunities;
  uint256 public immutable mintPrice;
  uint256 public immutable maxCommunityWhitelistLength;
  uint256 public immutable whitelistMintStart;
  uint256 public immutable whitelistMintEnd;
  address payable public immutable beneficiaryAddress;
  string private _tokenBaseURI;
  string public placeholderTokenURI;
  uint256 public communityRandomness;
  uint256 private _royaltyPercentageBasisPoints;
  uint256 public tokenIdCounter;
  uint256 public burnCounter;
  // Slot size (32 + 160 + 8 + 8 + 8 = 216)
  // ERC-2981: NFT Royalty Standard
  bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;
  address private _royaltyReceipientAddress;
  bool public tokenBaseURILocked;
  bool public listsLocked;
  bool public webaverseLandAddressLocked;
  bool public placeholderTokenURILocked;
  // Claim whitelist merkle root - for auction
  // hash(quantity, address)
  bytes32 public claimWhitelistMerkleRoot;
  mapping(address => bool) private _claimHasMinted;
  // Treasury whitelist merkle root - for metadrop & webaverse treasury
  // hash(quantity, address)
  bytes32 public treasuryWhitelistMerkleRoot;
  mapping(address => uint256) private _treasuryAllocationMinted;
  // Direct whitelist merkle root
  // hash(position, address)
  bytes32 public directWhitelistMerkleRoot;
  // Community whitelist merkle root
  // hash(community, position, address)
  bytes32 public communityWhitelistMerkleRoot;
  // Community ID => Community whitelist merkle length
  mapping(uint256 => uint256) public communityWhitelistLengths;
  // Completion whitelist merkle root
  // hash(quantity, address, unitPrice)
  bytes32 public completionWhitelistMerkleRoot;
  mapping(address => uint256) private _completionAllocationMinted;
  uint256 public pauseCutoffDays;
  // Single bool for first stage mint (direct and community) - each
  // address can only mint once, regardless of multiple eligibility:
  mapping(address => bool) private _firstStageAddressHasMinted;
  // Webaverse Land contract address:
  address public webaverseLandAddress;
  /**
   *
   * @dev constructor: Must be passed following addresses:
   *                   * chainlink VRF address and Link token address
   *
   */
  constructor(
    // configIntegers array must contain the following:
    // [0]: numberOfCommunities (e.g. 7)
    // [1]: maxCommunityWhitlistLength (how many slots are open per community, beyond which we 'lottery' using a randon start position)
    // [2]: whitelistMintStart (timestamp of when the stage 1 mint will start)
    // [3]: pauseCutoffDays (when the ability to pause this contract expires)
    uint256[] memory configIntegers_,
    uint256 maxSupply_,
    uint256 mintPrice_,
    address royaltyReceipientAddress_,
    uint256 royaltyPercentageBasisPoints_,
    address vrfCoordinator_,
    bytes32 vrfKeyHash_,
    address payable beneficiaryAddress_
  )
    ERC721("Webaverse Genesis Pass", "WEBA")
    VRFConsumerBaseV2(vrfCoordinator_)
  {
    numberOfCommunities = configIntegers_[0];
    maxCommunityWhitelistLength = configIntegers_[1];
    whitelistMintStart = configIntegers_[2];
    pauseCutoffDays = configIntegers_[3];
    whitelistMintEnd = whitelistMintStart + 2 days;
    maxSupply = maxSupply_;
    mintPrice = mintPrice_;
    _royaltyReceipientAddress = royaltyReceipientAddress_;
    _royaltyPercentageBasisPoints = royaltyPercentageBasisPoints_;
    vrfCoordinator = VRFCoordinatorV2Interface(vrfCoordinator_);
    vrfKeyHash = vrfKeyHash_;
    beneficiaryAddress = beneficiaryAddress_;
  }
  /**
   *
   * @dev WebaverseVotes: Emit the votes cast with this mint to be tallied off-chain.
   *
   */
  event WebaverseVotes(address voter, uint256 quantityMinted, uint256[] votes);
  /**
   *
   * @dev Only allow when stage 1 whitelist minting is open:
   *
   */
  modifier whenStage1MintingOpen() {
    require(stage1MintingOpen(), "Stage 1 mint closed");
    require(communityRandomness != 0, "Community randomness not set");
    _;
  }
  /**
   *
   * @dev whenListsUnlocked: restrict access to when the lists are unlocked.
   * This allows the owner to effectively end new minting, with eligibility
   * fixed to the details on the merkle roots (and associated lists) already
   * saved in storage
   *
   */
  modifier whenListsUnlocked() {
    require(!listsLocked, "Lists locked");
    _;
  }
  /**
   *
   * @dev whenLandAddressUnlocked: the webaverse land address cannot be
   * updated after it has been locked
   *
   */
  modifier whenLandAddressUnlocked() {
    require(!webaverseLandAddressLocked, "Land address locked");
    _;
  }
  /**
   *
   * @dev whenPlaceholderURIUnlocked: the placeholder URI cannot be
   * updated after it has been locked
   *
   */
  modifier whenPlaceholderURIUnlocked() {
    require(!placeholderTokenURILocked, "Place holder URI locked");
    _;
  }
  /**
   *
   * @dev whenSupplyRemaining: Supply is controlled by lists and cannot be exceeded, but as
   * an explicity and clear control we check here that the mint operation requested will not
   * exceed the max supply.
   *
   */
  modifier whenSupplyRemaining(uint256 quantity_) {
    require((tokenIdCounter + quantity_) <= maxSupply, "Max supply exceeded");
    _;
  }
  /**
   *
   * @dev stage1MintingOpen: View of whether stage 1 mint is open
   *
   */
  function stage1MintingOpen() public view returns (bool) {
    return
      block.timestamp > (whitelistMintStart - 1) &&
      block.timestamp < (whitelistMintEnd + 1);
  }
  /**
   *
   * @dev isStage1MintingEnded: View of whether stage 1 mint is ended
   *
   */
  function stage1MintingEnded() public view returns (bool) {
    return block.timestamp > whitelistMintEnd;
  }
  /**
   * totalSupply is the number of tokens minted (value tokenIdCounter, as this is 0
   * indexed by always set to the next ID it will issue) minus burned
   */
  function totalSupply() public view returns (uint256) {
    return tokenIdCounter - burnCounter;
  }
  /**
   *
   * @dev getRandomNumber: Requests randomness.
   *
   */
  function getRandomNumber() public onlyOwner returns (uint256) {
    require(communityWhitelistMerkleRoot != 0, "Community list not set");
    require(communityRandomness == 0, "Randomness set");
    return
      vrfCoordinator.requestRandomWords(
        vrfKeyHash,
        vrfSubscriptionId,
        vrfRequestConfirmations,
        vrfCallbackGasLimit,
        vrfNumWords
      );
  }
  /**
   *
   * @dev fulfillRandomWords: Callback function used by VRF Coordinator.
   * This function is used to generate random values used in community & claim minting
   *
   */
  function fulfillRandomWords(uint256, uint256[] memory randomWords_)
    internal
    override
  {
    require(communityRandomness == 0, "Randomness set");
    communityRandomness = randomWords_[0];
  }
  /**
   *
   * @dev setVRFSubscriptionId: Set the chainlink subscription id.
   *
   */
  function setVRFSubscriptionId(uint64 vrfSubscriptionId_) external onlyOwner {
    vrfSubscriptionId = vrfSubscriptionId_;
  }
  /**
   *
   * @dev withdrawContractBalance: A withdraw function to allow ETH balance to be withdrawn to the beneficiary address
   * set in the constructor
   *
   */
  function withdrawContractBalance() external onlyOwner {
    (bool success, ) = beneficiaryAddress.call{value: address(this).balance}(
      ""
    );
    require(success, "Transfer failed");
  }
  /**
   *
   * @dev receive: Handles receiving ether to the contract. Reject all direct payments to the contract except from beneficiary and owner.
   * set in the constructor
   *
   */
  receive() external payable {
    require(msg.value > 0, "No ETH");
    require(
      msg.sender == beneficiaryAddress || msg.sender == owner(),
      "Only owner or beneficiary"
    );
  }
  /**
   *
   * @dev transferERC20Token: A withdraw function to avoid locking ERC20 tokens in the contract forever.
   * Tokens can only be withdrawn by the owner, to the owner.
   *
   */
  function transferERC20Token(IERC20 token, uint256 amount) public onlyOwner {
    token.safeTransfer(owner(), amount);
  }
  /**
   *
   * @dev pause: Allow owner to pause.
   *
   */
  function pause() public onlyOwner {
    require(
      whitelistMintStart == 0 ||
        block.timestamp < (whitelistMintStart + pauseCutoffDays * 1 days),
      "Pause cutoff passed"
    );
    _pause();
  }
  /**
   *
   * @dev unpause: Allow owner to unpause.
   *
   */
  function unpause() public onlyOwner {
    _unpause();
  }
  /**
   *
   * @dev lockLists: Prevent any further changes to list merkle roots.
   *
   */
  function lockLists() public onlyOwner {
    listsLocked = true;
  }
  /**
   *
   * @dev lockLandAddress: Prevent any further changes to the webaverse land contract address.
   *
   */
  function lockLandAddress() public onlyOwner {
    webaverseLandAddressLocked = true;
  }
  /**
   *
   * @dev setLandAddress: Set the root for the auction claims.
   *
   */
  function setLandAddress(address webaverseLandAddress_)
    external
    onlyOwner
    whenLandAddressUnlocked
  {
    webaverseLandAddress = webaverseLandAddress_;
  }
  /**
   *
   * @dev lockPlaceholderTokenURI: Prevent any further changes to the placeholder URI.
   *
   */
  function lockPlaceholderTokenURI() public onlyOwner {
    placeholderTokenURILocked = true;
  }
  /**
   *
   * @dev setPlaceholderTokenURI: Set the string for the placeholder
   * token URI.
   *
   */
  function setPlaceholderTokenURI(string memory placeholderTokenURI_)
    external
    onlyOwner
    whenPlaceholderURIUnlocked
  {
    placeholderTokenURI = placeholderTokenURI_;
  }
  /**
   *
   * @dev setDirectWhitelist: Set the initial data for the direct list mint.
   *
   */
  function setDirectWhitelist(bytes32 directWhitelistMerkleRoot_)
    external
    whenListsUnlocked
    onlyOwner
  {
    directWhitelistMerkleRoot = directWhitelistMerkleRoot_;
  }
  /**
   *
   * @dev setCommunityWhitelist: Set the initial data for the community mint.
   *
   */
  function setCommunityWhitelist(
    uint256[] calldata communityWhitelistLengths_,
    bytes32 communityWhitelistMerkleRoot_
  ) external whenListsUnlocked onlyOwner {
    require(
      communityWhitelistLengths_.length == numberOfCommunities,
      "Community length doesnt match"
    );
    communityWhitelistMerkleRoot = communityWhitelistMerkleRoot_;
    for (
      uint256 communityId = 0;
      communityId < numberOfCommunities;
      communityId++
    ) {
      communityWhitelistLengths[communityId] = communityWhitelistLengths_[
        communityId
      ];
    }
  }
  /**
   *
   * @dev setClaimWhitelistMerkleRoot: Set the root for the auction claims.
   *
   */
  function setClaimWhitelistMerkleRoot(bytes32 claimWhitelistMerkleRoot_)
    external
    whenListsUnlocked
    onlyOwner
  {
    claimWhitelistMerkleRoot = claimWhitelistMerkleRoot_;
  }
  /**
   *
   * @dev setTreasuryWhitelistMerkleRoot: Set the root for the treasury claims (metadrop + webaverse allocations).
   *
   */
  function setTreasuryWhitelistMerkleRoot(bytes32 treasuryWhitelistMerkleRoot_)
    external
    whenListsUnlocked
    onlyOwner
  {
    treasuryWhitelistMerkleRoot = treasuryWhitelistMerkleRoot_;
  }
  /**
   *
   * @dev setCompletionWhitelistMerkleRoot: Set the root for completion mints.
   *
   */
  function setCompletionWhitelistMerkleRoot(
    bytes32 completionWhitelistMerkleRoot_
  ) external whenListsUnlocked onlyOwner {
    completionWhitelistMerkleRoot = completionWhitelistMerkleRoot_;
  }
  /**
   *
   * @dev _getCommunityHash: Get hash of information for the community mint.
   *
   */
  function _getCommunityHash(
    uint256 community_,
    uint256 position_,
    address minter_
  ) internal pure returns (bytes32) {
    return keccak256(abi.encodePacked(community_, position_, minter_));
  }
  /**
   *
   * @dev _getDirectHash: Get hash of information for mints for direct list.
   *
   */
  function _getDirectHash(address minter_) internal pure returns (bytes32) {
    return keccak256(abi.encodePacked(minter_));
  }
  /**
   *
   * @dev _getClaimAndTreasuryHash: Get hash of information for mints from the auction (claims).
   * Also the same hash format as the treasury whitelist, used for treasuryWhitelistMerkleRoot too
   *
   */
  function _getClaimAndTreasuryHash(uint256 quantity_, address minter_)
    internal
    pure
    returns (bytes32)
  {
    return keccak256(abi.encodePacked(quantity_, minter_));
  }
  /**
   *
   * @dev _getCompletionHash: Get hash of information for mints from the auction (claims).
   * Also the same hash format as the treasury whitelist, used for treasuryWhitelistMerkleRoot too
   *
   */
  function _getCompletionHash(
    uint256 quantity_,
    address minter_,
    uint256 unitPrice_
  ) internal pure returns (bytes32) {
    return keccak256(abi.encodePacked(quantity_, minter_, unitPrice_));
  }
  /**
   *
   * @dev isValidPosition: Check is this is a valid position for this community allowlist. There are
   * 1,000 positions per community. If more than 1,000 have registered a random start position in the
   * allowlist is used to determine eligibility.
   *
   */
  function isValidPosition(uint256 position_, uint256 community_)
    internal
    view
    returns (bool)
  {
    uint256 communityWhitelistLength = communityWhitelistLengths[community_];
    require(communityWhitelistLength > 0, "Length not set");
    if (communityWhitelistLength > maxCommunityWhitelistLength) {
      // Find the random starting point somewhere in the whitelist length array
      uint256 startPoint = communityRandomness % communityWhitelistLength;
      uint256 endPoint = startPoint + maxCommunityWhitelistLength;
      // If the valid range exceeds the length of the whitelist, it must roll over
      if (endPoint > communityWhitelistLength) {
        return
          position_ >= startPoint ||
          position_ < endPoint - communityWhitelistLength;
      } else {
        return position_ >= startPoint && position_ < endPoint;
      }
    } else {
      return true;
    }
  }
  /**
   *
   * @dev _checkTheVote: check the count of votes = the quantity minted:
   *
   */
  function _checkTheVote(uint256[] memory votesToCount_, uint256 quantity_)
    internal
    view
  {
    // (1) Check that we have been passed the right number of community votes in the array:
    require(
      votesToCount_.length == numberOfCommunities,
      "Vote array does not match community count"
    );
    // (2) Check that the total votes matches the mint quantity:
    uint256 totalVotes;
    for (uint256 i = 0; i < votesToCount_.length; i++) {
      totalVotes += votesToCount_[i];
    }
    require(totalVotes == quantity_, "Votes do not match minting quantity");
  }
  /**
   *
   * @dev communityMint: Minting of community allocations from the allowlist.
   *
   */
  function communityMint(
    uint256 community_,
    uint256 position_,
    bytes32[] calldata proof_,
    uint256[] calldata votes_
  ) external payable whenStage1MintingOpen whenSupplyRemaining(1) {
    require(msg.value == mintPrice, "Insufficient ETH passed");
    require(communityWhitelistMerkleRoot != 0, "Community merkle root not set");
    // Check the total votes passed equals the minted quantity:
    _checkTheVote(votes_, 1);
    bytes32 leaf = _getCommunityHash(community_, position_, msg.sender);
    require(
      MerkleProof.verify(proof_, communityWhitelistMerkleRoot, leaf),
      "Community mint proof invalid"
    );
    require(
      isValidPosition(position_, community_),
      "This position has missed out"
    );
    _performDirectAndCommunityMint(msg.sender, votes_);
  }
  /**
   *
   * @dev directMint:  Mint allocations from the webaverse direct allowlist
   *
   */
  function directMint(bytes32[] calldata proof_, uint256[] calldata votes_)
    external
    payable
    whenStage1MintingOpen
    whenSupplyRemaining(1)
  {
    require(msg.value == mintPrice, "Insufficient ETH passed");
    require(directWhitelistMerkleRoot != 0, "Direct merkle root not set");
    // Check the total votes passed equals the minted quantity:
    _checkTheVote(votes_, 1);
    bytes32 leaf = _getDirectHash(msg.sender);
    require(
      MerkleProof.verify(proof_, directWhitelistMerkleRoot, leaf),
      "Direct mint proof invalid"
    );
    _performDirectAndCommunityMint(msg.sender, votes_);
  }
  /**
   *
   * @dev claimMint: Whitelist proof is generated from quantity and address
   *
   */
  function claimMint(
    uint256 quantityToMint_,
    bytes32[] calldata proof_,
    uint256[] calldata votes_
  ) public whenSupplyRemaining(quantityToMint_) {
    require(claimWhitelistMerkleRoot != 0, "Mint merkle root not set");
    // Check the total votes passed equals the minted quantity:
    _checkTheVote(votes_, quantityToMint_);
    bytes32 leaf = _getClaimAndTreasuryHash(quantityToMint_, msg.sender);
    require(
      MerkleProof.verify(proof_, claimWhitelistMerkleRoot, leaf),
      "Claim mint proof invalid"
    );
    require(!_claimHasMinted[msg.sender], "Claim: Address has already minted");
    _claimHasMinted[msg.sender] = true;
    _batchMint(msg.sender, quantityToMint_);
    emit WebaverseVotes(msg.sender, quantityToMint_, votes_);
  }
  /**
   *
   * @dev treasuryMint: Mint function for metadrop & webaverse treasury + other parties
   *
   */
  function treasuryMint(
    uint256 quantityEligible_,
    bytes32[] calldata proof_,
    uint256 quantityToMint_
  ) public whenSupplyRemaining(quantityToMint_) {
    require(treasuryWhitelistMerkleRoot != 0, "Mint merkle root not set");
    bytes32 leaf = _getClaimAndTreasuryHash(quantityEligible_, msg.sender);
    require(
      MerkleProof.verify(proof_, treasuryWhitelistMerkleRoot, leaf),
      "Treasury: mint proof invalid"
    );
    require(
      (_treasuryAllocationMinted[msg.sender] + quantityToMint_) <=
        quantityEligible_,
      "Treasury: Requesting more than remaining allocation"
    );
    _treasuryAllocationMinted[msg.sender] += quantityToMint_;
    _batchMint(msg.sender, quantityToMint_);
  }
  /**
   *
   * @dev completionMint
   *
   */
  function completionMint(
    uint256 quantityEligible_,
    bytes32[] calldata proof_,
    uint256 quantityToMint_,
    uint256 unitPrice_
  ) public payable whenSupplyRemaining(quantityToMint_) {
    require(
      msg.value == (quantityToMint_ * unitPrice_),
      "Insufficient ETH passed"
    );
    require(
      completionWhitelistMerkleRoot != 0,
      "Completion merkle root not set"
    );
    bytes32 leaf = _getCompletionHash(
      quantityEligible_,
      msg.sender,
      unitPrice_
    );
    require(
      MerkleProof.verify(proof_, completionWhitelistMerkleRoot, leaf),
      "Completion: mint proof invalid"
    );
    require(
      (_completionAllocationMinted[msg.sender] + quantityToMint_) <=
        quantityEligible_,
      "Completion: Requesting more than remaining allocation"
    );
    _completionAllocationMinted[msg.sender] += quantityToMint_;
    _batchMint(msg.sender, quantityToMint_);
  }
  /**
   *
   * @dev _performDirectAndCommunityMint:  Unified processing for direct and community mint
   *
   */
  function _performDirectAndCommunityMint(
    address minter_,
    uint256[] calldata votes_
  ) internal {
    require(
      !_firstStageAddressHasMinted[minter_],
      "Community and Direct: Address has already minted"
    );
    _firstStageAddressHasMinted[minter_] = true;
    _safeMint(minter_, tokenIdCounter);
    tokenIdCounter += 1;
    emit WebaverseVotes(minter_, 1, votes_);
  }
  /**
   *
   * @dev _batchMint:  Unified processing for treasury, claim and completion mint
   *
   */
  function _batchMint(address minter_, uint256 quantity_) internal {
    uint256 tempTokenIdCounter = tokenIdCounter;
    for (uint256 i = 0; i < quantity_; i++) {
      _safeMint(minter_, tempTokenIdCounter);
      tempTokenIdCounter += 1;
    }
    tokenIdCounter = tempTokenIdCounter;
  }
  /**
   *
   * @dev setRoyaltyPercentageBasisPoints: allow the owner to set the base royalty percentage.
   *
   */
  function setRoyaltyPercentageBasisPoints(
    uint256 royaltyPercentageBasisPoints_
  ) external onlyOwner {
    _royaltyPercentageBasisPoints = royaltyPercentageBasisPoints_;
  }
  /**
   *
   * @dev setRoyaltyReceipientAddress: Allow the owner to set the royalty recipient.
   *
   */
  function setRoyaltyReceipientAddress(
    address payable royaltyReceipientAddress_
  ) external onlyOwner {
    _royaltyReceipientAddress = royaltyReceipientAddress_;
  }
  /**
   *
   * @dev setTokenBaseURI: Allow the owner to set the base token URI
   *
   */
  function setTokenBaseURI(string calldata tokenBaseURI_) external onlyOwner {
    require(!tokenBaseURILocked, "Token base URI is locked");
    _tokenBaseURI = tokenBaseURI_;
  }
  /**
   *
   * @dev lockTokenBaseURI: allow the owner to lock the base token URI, after which the URI cannot be altered.
   *
   */
  function lockTokenBaseURI() external onlyOwner {
    require(!tokenBaseURILocked, "Token base URI is locked");
    tokenBaseURILocked = true;
  }
  /**
   *
   * @dev royaltyInfo: Returns recipent address and royalty.
   *
   */
  function royaltyInfo(uint256, uint256 salePrice_)
    external
    view
    returns (address receiver, uint256 royaltyAmount)
  {
    uint256 royalty = (salePrice_ * _royaltyPercentageBasisPoints) / 10000;
    return (_royaltyReceipientAddress, royalty);
  }
  /**
   *
   * @dev _baseURI: returns the URI
   *
   */
  function _baseURI() internal view override returns (string memory) {
    return _tokenBaseURI;
  }
  function tokenURI(uint256 tokenId)
    public
    view
    override
    returns (string memory)
  {
    require(
      _exists(tokenId),
      "ERC721Metadata: URI query for nonexistent token"
    );
    // If there is a land contract address set, use that address to retrieve the tokenURI:
    if (webaverseLandAddress != address(0)) {
      // Call the contract to return the token URI for this token ID:
      return IWebaverseLand(webaverseLandAddress).uriForToken(tokenId);
      // See if we have a token base URI set:
    } else if (bytes(_tokenBaseURI).length != 0) {
      // Return tokenBaseURI appended with the tokenId number:
      return
        string(abi.encodePacked(_tokenBaseURI, tokenId.toString(), ".json"));
      // If neither of the above, use the placeholder URI
    } else {
      // The placeholder URI is the same for all tokenIds:
      return placeholderTokenURI;
    }
  }
  /**
   *
   * @dev _beforeTokenTransfer: function called before tokens are transfered.
   *
   */
  function _beforeTokenTransfer(
    address from,
    address to,
    uint256 tokenId
  ) internal override(ERC721) whenNotPaused {
    super._beforeTokenTransfer(from, to, tokenId);
  }
  /**
   *
   * @dev supportsInterface: ERC2981 interface support.
   *
   */
  function supportsInterface(bytes4 interfaceId)
    public
    view
    override(ERC721)
    returns (bool)
  {
    return
      interfaceId == _INTERFACE_ID_ERC2981 ||
      super.supportsInterface(interfaceId);
  }
  /**
   * ============================
   * Web app eligibility getters:
   * ============================
   */
  /**
   *
   * @dev eligibleForCommunityMint: Eligibility check for the COMMUNITY mint. This can be called from front-end (for example to control
   * screen components that indicate if the connected address is eligible).
   *
   * Function flow is as follows:
   * (1) Check that the position, community and address are in the allowlist.
   * (2) Check if this leaf has already minted. If so, exit with false eligibility and reason "Sender has already minted for this community"
   * (3) Check if this leaf is in a valid position in the allowlist. If not, exit with false eligilibity and reason "This position has missed out"
   * (4) All checks passed, return elibility = true, the delivery address and valid leaf.
   *
   */
  function eligibleForCommunityMint(
    address addressToCheck_,
    uint256 position_,
    uint256 community_,
    bytes32[] calldata proof_
  )
    external
    view
    returns (
      address,
      bool eligible,
      string memory reason,
      bytes32 leaf,
      address
    )
  {
    leaf = _getCommunityHash(community_, position_, addressToCheck_);
    if (
      MerkleProof.verify(proof_, communityWhitelistMerkleRoot, leaf) == false
    ) {
      return (
        addressToCheck_,
        false,
        "Community mint proof invalid",
        leaf,
        addressToCheck_
      );
    }
    if (_firstStageAddressHasMinted[addressToCheck_]) {
      return (
        addressToCheck_,
        false,
        "Community: Address has already minted",
        leaf,
        addressToCheck_
      );
    }
    if (!isValidPosition(position_, community_)) {
      return (
        addressToCheck_,
        false,
        "This position has missed out",
        leaf,
        addressToCheck_
      );
    }
    return (addressToCheck_, true, "", leaf, addressToCheck_);
  }
  /**
   *
   * @dev eligibleForDirectMint: Eligibility check for the DIRECT mint. This can be called from front-end (for example to control
   * screen components that indicate if the connected address is eligible).
   *
   * Function flow is as follows:
   * (1) Check that the position and address are in the allowlist.
   * (2) Check if this minter address has already minted. If so, exit with false eligibility and reason "Address has already minted"
   * (3) All checks passed, return elibility = true, the delivery address and valid minter adress.
   *
   */
  function eligibleForDirectMint(
    address addressToCheck_,
    bytes32[] calldata proof_
  )
    external
    view
    returns (
      address,
      address,
      bool eligible,
      string memory reason
    )
  {
    bytes32 leaf = _getDirectHash(addressToCheck_);
    if (MerkleProof.verify(proof_, directWhitelistMerkleRoot, leaf) == false) {
      return (
        addressToCheck_,
        addressToCheck_,
        false,
        "Direct mint proof invalid"
      );
    }
    if (_firstStageAddressHasMinted[addressToCheck_]) {
      return (
        addressToCheck_,
        addressToCheck_,
        false,
        "Direct: Address has already minted"
      );
    }
    return (addressToCheck_, addressToCheck_, true, "");
  }
  /**
   *
   * @dev eligibleForClaimMint: Eligibility check for the CLAIM mint. This can be called from front-end (for example to control
   * screen components that indicate if the connected address is eligible).
   *
   * Function flow is as follows:
   * (1) Check that the position and address are in the allowlist.
   * (2) Check if this minter address has already minted. If so, exit with false eligibility and reason "Address has already minted"
   * (3) All checks passed, return elibility = true, the delivery address and valid minter adress.
   *
   */
  function eligibleForClaimMint(
    address addressToCheck_,
    uint256 quantity_,
    bytes32[] calldata proof_
  )
    external
    view
    returns (
      address,
      address,
      bool eligible,
      string memory reason
    )
  {
    bytes32 leaf = _getClaimAndTreasuryHash(quantity_, addressToCheck_);
    if (MerkleProof.verify(proof_, claimWhitelistMerkleRoot, leaf) == false) {
      return (
        addressToCheck_,
        addressToCheck_,
        false,
        "Claim mint proof invalid"
      );
    }
    if (_claimHasMinted[addressToCheck_]) {
      return (
        addressToCheck_,
        addressToCheck_,
        false,
        "Claim: Address has already minted"
      );
    }
    return (addressToCheck_, addressToCheck_, true, "");
  }
  /**
   *
   * @dev eligibleForTreasuryMint: Eligibility check for the treasury mint. This can be called from front-end (for example to control
   * screen components that indicate if the connected address is eligible).
   * Function flow is as follows:
   * (1) Check that the quantityEligible and address are in the allowlist.
   * (2) Check if this minter is requesting more than its allocation. If so, exit with false eligibility and reason "Treasury: Requesting more than remaining allocation"
   * (3) All checks passed, return elibility = true, the delivery address and valid minter adress.
   *
   */
  function eligibleForTreasuryMint(
    address addressToCheck_,
    uint256 quantityEligible_,
    bytes32[] calldata proof_,
    uint256 quantityToMint_
  )
    external
    view
    returns (
      address,
      address,
      bool eligible,
      string memory reason
    )
  {
    // (2) Check the proof is valid
    bytes32 leaf = _getClaimAndTreasuryHash(quantityEligible_, addressToCheck_);
    if (
      MerkleProof.verify(proof_, treasuryWhitelistMerkleRoot, leaf) == false
    ) {
      return (
        addressToCheck_,
        addressToCheck_,
        false,
        "Treasury: mint proof invalid"
      );
    }
    if (
      (_treasuryAllocationMinted[addressToCheck_] + quantityToMint_) >
      quantityEligible_
    ) {
      return (
        addressToCheck_,
        addressToCheck_,
        false,
        "Treasury: Requesting more than remaining allocation"
      );
    }
    return (addressToCheck_, addressToCheck_, true, "");
  }
  /**
   *
   * @dev eligibleForCompletionMint: Eligibility check for the completion mint. This can be called from front-end (for example to control
   * screen components that indicate if the connected address is eligible).
   * Function flow is as follows:
   * (1) Check that the quantityEligible, address and unitPrice are in the allowlist.
   * (2) Check if this minter is requesting more than its allocation. If so, exit with false eligibility and reason "Treasury: Requesting more than remaining allocation"
   * (3) All checks passed, return elibility = true, the delivery address and valid minter adress.
   *
   */
  function eligibleForCompletionMint(
    address addressToCheck_,
    uint256 quantityEligible_,
    bytes32[] calldata proof_,
    uint256 quantityToMint_,
    uint256 unitPrice_
  )
    external
    view
    returns (
      address,
      address,
      bool eligible,
      string memory reason
    )
  {
    bytes32 leaf = _getCompletionHash(
      quantityEligible_,
      addressToCheck_,
      unitPrice_
    );
    if (
      MerkleProof.verify(proof_, completionWhitelistMerkleRoot, leaf) == false
    ) {
      return (
        addressToCheck_,
        addressToCheck_,
        false,
        "Completion: mint proof invalid"
      );
    }
    if (
      (_completionAllocationMinted[addressToCheck_] + quantityToMint_) >
      quantityEligible_
    ) {
      return (
        addressToCheck_,
        addressToCheck_,
        false,
        "Completion: Requesting more than remaining allocation"
      );
    }
    return (addressToCheck_, addressToCheck_, true, "");
  }
  /**
   * @dev Burns `tokenId`. See {ERC721-_burn}.
   *
   * Requirements:
   *
   * - The caller must own `tokenId` or be an approved operator.
   */
  function burn(uint256 tokenId) public override {
    super.burn(tokenId);
    burnCounter += 1;
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../../../utils/Address.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;
    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)
pragma solidity ^0.8.0;
import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";
/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;
    // Token name
    string private _name;
    // Token symbol
    string private _symbol;
    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;
    // Mapping owner address to token count
    mapping(address => uint256) private _balances;
    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;
    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;
    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }
    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }
    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }
    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }
    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }
    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");
        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );
        _approve(to, tokenId);
    }
    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");
        return _tokenApprovals[tokenId];
    }
    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }
    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }
    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _transfer(from, to, tokenId);
    }
    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }
    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }
    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }
    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }
    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }
    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }
    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");
        _beforeTokenTransfer(address(0), to, tokenId);
        _balances[to] += 1;
        _owners[tokenId] = to;
        emit Transfer(address(0), to, tokenId);
    }
    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);
        _beforeTokenTransfer(owner, address(0), tokenId);
        // Clear approvals
        _approve(address(0), tokenId);
        _balances[owner] -= 1;
        delete _owners[tokenId];
        emit Transfer(owner, address(0), tokenId);
    }
    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");
        _beforeTokenTransfer(from, to, tokenId);
        // Clear approvals from the previous owner
        _approve(address(0), tokenId);
        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;
        emit Transfer(from, to, tokenId);
    }
    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }
    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }
    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }
    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);
    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);
    bool private _paused;
    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }
    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }
    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Burnable.sol)
pragma solidity ^0.8.0;
import "../ERC721.sol";
import "../../../utils/Context.sol";
/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be irreversibly burned (destroyed).
 */
abstract contract ERC721Burnable is Context, ERC721 {
    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) public virtual {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved");
        _burn(tokenId);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface VRFCoordinatorV2Interface {
  /**
   * @notice Get configuration relevant for making requests
   * @return minimumRequestConfirmations global min for request confirmations
   * @return maxGasLimit global max for request gas limit
   * @return s_provingKeyHashes list of registered key hashes
   */
  function getRequestConfig()
    external
    view
    returns (
      uint16,
      uint32,
      bytes32[] memory
    );
  /**
   * @notice Request a set of random words.
   * @param keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * @param subId  - The ID of the VRF subscription. Must be funded
   * with the minimum subscription balance required for the selected keyHash.
   * @param minimumRequestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * @param callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [0, maxGasLimit]
   * @param numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(
    bytes32 keyHash,
    uint64 subId,
    uint16 minimumRequestConfirmations,
    uint32 callbackGasLimit,
    uint32 numWords
  ) external returns (uint256 requestId);
  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   */
  function createSubscription() external returns (uint64 subId);
  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return reqCount - number of requests for this subscription, determines fee tier.
   * @return owner - owner of the subscription.
   * @return consumers - list of consumer address which are able to use this subscription.
   */
  function getSubscription(uint64 subId)
    external
    view
    returns (
      uint96 balance,
      uint64 reqCount,
      address owner,
      address[] memory consumers
    );
  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner) external;
  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(uint64 subId) external;
  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(uint64 subId, address consumer) external;
  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(uint64 subId, address consumer) external;
  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(uint64 subId, address to) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness. It ensures 2 things:
 * @dev 1. The fulfillment came from the VRFCoordinator
 * @dev 2. The consumer contract implements fulfillRandomWords.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constructor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash). Create subscription, fund it
 * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface
 * @dev subscription management functions).
 * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,
 * @dev callbackGasLimit, numWords),
 * @dev see (VRFCoordinatorInterface for a description of the arguments).
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomWords method.
 *
 * @dev The randomness argument to fulfillRandomWords is a set of random words
 * @dev generated from your requestId and the blockHash of the request.
 *
 * @dev If your contract could have concurrent requests open, you can use the
 * @dev requestId returned from requestRandomWords to track which response is associated
 * @dev with which randomness request.
 * @dev See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ.
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request. It is for this reason that
 * @dev that you can signal to an oracle you'd like them to wait longer before
 * @dev responding to the request (however this is not enforced in the contract
 * @dev and so remains effective only in the case of unmodified oracle software).
 */
abstract contract VRFConsumerBaseV2 {
  error OnlyCoordinatorCanFulfill(address have, address want);
  address private immutable vrfCoordinator;
  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   */
  constructor(address _vrfCoordinator) {
    vrfCoordinator = _vrfCoordinator;
  }
  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBaseV2 expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomWords the VRF output expanded to the requested number of words
   */
  function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal virtual;
  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomWords(uint256 requestId, uint256[] memory randomWords) external {
    if (msg.sender != vrfCoordinator) {
      revert OnlyCoordinatorCanFulfill(msg.sender, vrfCoordinator);
    }
    fulfillRandomWords(requestId, randomWords);
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/MerkleProof.sol)
pragma solidity ^0.8.0;
/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }
    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }
        return computedHash;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
interface IWebaverseLand {
  // Function to call to return the tokenURI for a passed token Id
  function uriForToken(uint256 tokenId_) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
import './IDelegate.sol';
import './IWETHUpgradable.sol';
import './MarketConsts.sol';
import '@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
import '@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol';
import '@openzeppelin/contracts/utils/cryptography/ECDSA.sol';
interface IX2Y2Run {
    function run1(
        Market.Order memory order,
        Market.SettleShared memory shared,
        Market.SettleDetail memory detail
    ) external returns (uint256);
}
contract X2Y2_r1 is
    Initializable,
    ReentrancyGuardUpgradeable,
    OwnableUpgradeable,
    PausableUpgradeable,
    IX2Y2Run
{
    using SafeERC20Upgradeable for IERC20Upgradeable;
    event EvProfit(bytes32 itemHash, address currency, address to, uint256 amount);
    event EvAuctionRefund(
        bytes32 indexed itemHash,
        address currency,
        address to,
        uint256 amount,
        uint256 incentive
    );
    event EvInventory(
        bytes32 indexed itemHash,
        address maker,
        address taker,
        uint256 orderSalt,
        uint256 settleSalt,
        uint256 intent,
        uint256 delegateType,
        uint256 deadline,
        IERC20Upgradeable currency,
        bytes dataMask,
        Market.OrderItem item,
        Market.SettleDetail detail
    );
    event EvSigner(address signer, bool isRemoval);
    event EvDelegate(address delegate, bool isRemoval);
    event EvFeeCapUpdate(uint256 newValue);
    event EvCancel(bytes32 indexed itemHash);
    event EvFailure(uint256 index, bytes error);
    mapping(address => bool) public delegates;
    mapping(address => bool) public signers;
    mapping(bytes32 => Market.InvStatus) public inventoryStatus;
    mapping(bytes32 => Market.OngoingAuction) public ongoingAuctions;
    uint256 public constant RATE_BASE = 1e6;
    uint256 public feeCapPct;
    IWETHUpgradable public weth;
    receive() external payable {}
    function pause() public onlyOwner {
        _pause();
    }
    function unpause() public onlyOwner {
        _unpause();
    }
    function initialize(uint256 feeCapPct_, address weth_) public initializer {
        feeCapPct = feeCapPct_;
        weth = IWETHUpgradable(weth_);
        __ReentrancyGuard_init_unchained();
        __Pausable_init_unchained();
        __Ownable_init_unchained();
    }
    function updateFeeCap(uint256 val) public virtual onlyOwner {
        feeCapPct = val;
        emit EvFeeCapUpdate(val);
    }
    function updateSigners(address[] memory toAdd, address[] memory toRemove)
        public
        virtual
        onlyOwner
    {
        for (uint256 i = 0; i < toAdd.length; i++) {
            signers[toAdd[i]] = true;
            emit EvSigner(toAdd[i], false);
        }
        for (uint256 i = 0; i < toRemove.length; i++) {
            delete signers[toRemove[i]];
            emit EvSigner(toRemove[i], true);
        }
    }
    function updateDelegates(address[] memory toAdd, address[] memory toRemove)
        public
        virtual
        onlyOwner
    {
        for (uint256 i = 0; i < toAdd.length; i++) {
            delegates[toAdd[i]] = true;
            emit EvDelegate(toAdd[i], false);
        }
        for (uint256 i = 0; i < toRemove.length; i++) {
            delete delegates[toRemove[i]];
            emit EvDelegate(toRemove[i], true);
        }
    }
    function cancel(
        bytes32[] memory itemHashes,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual nonReentrant whenNotPaused {
        require(deadline > block.timestamp, 'deadline reached');
        bytes32 hash = keccak256(abi.encode(itemHashes.length, itemHashes, deadline));
        address signer = ECDSA.recover(hash, v, r, s);
        require(signers[signer], 'Input signature error');
        for (uint256 i = 0; i < itemHashes.length; i++) {
            bytes32 h = itemHashes[i];
            if (inventoryStatus[h] == Market.InvStatus.NEW) {
                inventoryStatus[h] = Market.InvStatus.CANCELLED;
                emit EvCancel(h);
            }
        }
    }
    function run(Market.RunInput memory input) public payable virtual nonReentrant whenNotPaused {
        require(input.shared.deadline > block.timestamp, 'input deadline reached');
        require(msg.sender == input.shared.user, 'sender does not match');
        _verifyInputSignature(input);
        uint256 amountEth = msg.value;
        if (input.shared.amountToWeth > 0) {
            uint256 amt = input.shared.amountToWeth;
            weth.deposit{value: amt}();
            SafeERC20Upgradeable.safeTransfer(weth, msg.sender, amt);
            amountEth -= amt;
        }
        if (input.shared.amountToEth > 0) {
            uint256 amt = input.shared.amountToEth;
            SafeERC20Upgradeable.safeTransferFrom(weth, msg.sender, address(this), amt);
            weth.withdraw(amt);
            amountEth += amt;
        }
        for (uint256 i = 0; i < input.orders.length; i++) {
            _verifyOrderSignature(input.orders[i]);
        }
        for (uint256 i = 0; i < input.details.length; i++) {
            Market.SettleDetail memory detail = input.details[i];
            Market.Order memory order = input.orders[detail.orderIdx];
            if (input.shared.canFail) {
                try IX2Y2Run(address(this)).run1(order, input.shared, detail) returns (
                    uint256 ethPayment
                ) {
                    amountEth -= ethPayment;
                } catch Error(string memory _err) {
                    emit EvFailure(i, bytes(_err));
                } catch (bytes memory _err) {
                    emit EvFailure(i, _err);
                }
            } else {
                amountEth -= _run(order, input.shared, detail);
            }
        }
        if (amountEth > 0) {
            payable(msg.sender).transfer(amountEth);
        }
    }
    function run1(
        Market.Order memory order,
        Market.SettleShared memory shared,
        Market.SettleDetail memory detail
    ) external virtual returns (uint256) {
        require(msg.sender == address(this), 'unsafe call');
        return _run(order, shared, detail);
    }
    function _hashItem(Market.Order memory order, Market.OrderItem memory item)
        internal
        view
        virtual
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    order.salt,
                    order.user,
                    order.network,
                    order.intent,
                    order.delegateType,
                    order.deadline,
                    order.currency,
                    order.dataMask,
                    item
                )
            );
    }
    function _emitInventory(
        bytes32 itemHash,
        Market.Order memory order,
        Market.OrderItem memory item,
        Market.SettleShared memory shared,
        Market.SettleDetail memory detail
    ) internal virtual {
        emit EvInventory(
            itemHash,
            order.user,
            shared.user,
            order.salt,
            shared.salt,
            order.intent,
            order.delegateType,
            order.deadline,
            order.currency,
            order.dataMask,
            item,
            detail
        );
    }
    function _run(
        Market.Order memory order,
        Market.SettleShared memory shared,
        Market.SettleDetail memory detail
    ) internal virtual returns (uint256) {
        uint256 nativeAmount = 0;
        Market.OrderItem memory item = order.items[detail.itemIdx];
        bytes32 itemHash = _hashItem(order, item);
        {
            require(itemHash == detail.itemHash, 'item hash does not match');
            require(order.network == block.chainid, 'wrong network');
            require(
                address(detail.executionDelegate) != address(0) &&
                    delegates[address(detail.executionDelegate)],
                'unknown delegate'
            );
        }
        bytes memory data = item.data;
        {
            if (order.dataMask.length > 0 && detail.dataReplacement.length > 0) {
                _arrayReplace(data, detail.dataReplacement, order.dataMask);
            }
        }
        if (detail.op == Market.Op.COMPLETE_SELL_OFFER) {
            require(inventoryStatus[itemHash] == Market.InvStatus.NEW, 'order already exists');
            require(order.intent == Market.INTENT_SELL, 'intent != sell');
            _assertDelegation(order, detail);
            require(order.deadline > block.timestamp, 'deadline reached');
            require(detail.price >= item.price, 'underpaid');
            nativeAmount = _takePayment(itemHash, order.currency, shared.user, detail.price);
            require(
                detail.executionDelegate.executeSell(order.user, shared.user, data),
                'delegation error'
            );
            _distributeFeeAndProfit(
                itemHash,
                order.user,
                order.currency,
                detail,
                detail.price,
                detail.price
            );
            inventoryStatus[itemHash] = Market.InvStatus.COMPLETE;
        } else if (detail.op == Market.Op.COMPLETE_BUY_OFFER) {
            require(inventoryStatus[itemHash] == Market.InvStatus.NEW, 'order already exists');
            require(order.intent == Market.INTENT_BUY, 'intent != buy');
            _assertDelegation(order, detail);
            require(order.deadline > block.timestamp, 'deadline reached');
            require(item.price == detail.price, 'price not match');
            require(!_isNative(order.currency), 'native token not supported');
            nativeAmount = _takePayment(itemHash, order.currency, order.user, detail.price);
            require(
                detail.executionDelegate.executeBuy(shared.user, order.user, data),
                'delegation error'
            );
            _distributeFeeAndProfit(
                itemHash,
                shared.user,
                order.currency,
                detail,
                detail.price,
                detail.price
            );
            inventoryStatus[itemHash] = Market.InvStatus.COMPLETE;
        } else if (detail.op == Market.Op.CANCEL_OFFER) {
            require(inventoryStatus[itemHash] == Market.InvStatus.NEW, 'unable to cancel');
            require(order.deadline > block.timestamp, 'deadline reached');
            inventoryStatus[itemHash] = Market.InvStatus.CANCELLED;
            emit EvCancel(itemHash);
        } else if (detail.op == Market.Op.BID) {
            require(order.intent == Market.INTENT_AUCTION, 'intent != auction');
            _assertDelegation(order, detail);
            bool firstBid = false;
            if (ongoingAuctions[itemHash].bidder == address(0)) {
                require(inventoryStatus[itemHash] == Market.InvStatus.NEW, 'order already exists');
                require(order.deadline > block.timestamp, 'auction ended');
                require(detail.price >= item.price, 'underpaid');
                firstBid = true;
                ongoingAuctions[itemHash] = Market.OngoingAuction({
                    price: detail.price,
                    netPrice: detail.price,
                    bidder: shared.user,
                    endAt: order.deadline
                });
                inventoryStatus[itemHash] = Market.InvStatus.AUCTION;
                require(
                    detail.executionDelegate.executeBid(order.user, address(0), shared.user, data),
                    'delegation error'
                );
            }
            Market.OngoingAuction storage auc = ongoingAuctions[itemHash];
            require(auc.endAt > block.timestamp, 'auction ended');
            nativeAmount = _takePayment(itemHash, order.currency, shared.user, detail.price);
            if (!firstBid) {
                require(
                    inventoryStatus[itemHash] == Market.InvStatus.AUCTION,
                    'order is not auction'
                );
                require(
                    detail.price - auc.price >= (auc.price * detail.aucMinIncrementPct) / RATE_BASE,
                    'underbid'
                );
                uint256 bidRefund = auc.netPrice;
                uint256 incentive = (detail.price * detail.bidIncentivePct) / RATE_BASE;
                if (bidRefund + incentive > 0) {
                    _transferTo(order.currency, auc.bidder, bidRefund + incentive);
                    emit EvAuctionRefund(
                        itemHash,
                        address(order.currency),
                        auc.bidder,
                        bidRefund,
                        incentive
                    );
                }
                require(
                    detail.executionDelegate.executeBid(order.user, auc.bidder, shared.user, data),
                    'delegation error'
                );
                auc.price = detail.price;
                auc.netPrice = detail.price - incentive;
                auc.bidder = shared.user;
            }
            if (block.timestamp + detail.aucIncDurationSecs > auc.endAt) {
                auc.endAt += detail.aucIncDurationSecs;
            }
        } else if (
            detail.op == Market.Op.REFUND_AUCTION ||
            detail.op == Market.Op.REFUND_AUCTION_STUCK_ITEM
        ) {
            require(
                inventoryStatus[itemHash] == Market.InvStatus.AUCTION,
                'cannot cancel non-auction order'
            );
            Market.OngoingAuction storage auc = ongoingAuctions[itemHash];
            if (auc.netPrice > 0) {
                _transferTo(order.currency, auc.bidder, auc.netPrice);
                emit EvAuctionRefund(
                    itemHash,
                    address(order.currency),
                    auc.bidder,
                    auc.netPrice,
                    0
                );
            }
            _assertDelegation(order, detail);
            if (detail.op == Market.Op.REFUND_AUCTION) {
                require(
                    detail.executionDelegate.executeAuctionRefund(order.user, auc.bidder, data),
                    'delegation error'
                );
            }
            delete ongoingAuctions[itemHash];
            inventoryStatus[itemHash] = Market.InvStatus.REFUNDED;
        } else if (detail.op == Market.Op.COMPLETE_AUCTION) {
            require(
                inventoryStatus[itemHash] == Market.InvStatus.AUCTION,
                'cannot complete non-auction order'
            );
            _assertDelegation(order, detail);
            Market.OngoingAuction storage auc = ongoingAuctions[itemHash];
            require(block.timestamp >= auc.endAt, 'auction not finished yet');
            require(
                detail.executionDelegate.executeAuctionComplete(order.user, auc.bidder, data),
                'delegation error'
            );
            _distributeFeeAndProfit(
                itemHash,
                order.user,
                order.currency,
                detail,
                auc.price,
                auc.netPrice
            );
            inventoryStatus[itemHash] = Market.InvStatus.COMPLETE;
            delete ongoingAuctions[itemHash];
        } else {
            revert('unknown op');
        }
        _emitInventory(itemHash, order, item, shared, detail);
        return nativeAmount;
    }
    function _assertDelegation(Market.Order memory order, Market.SettleDetail memory detail)
        internal
        view
        virtual
    {
        require(
            detail.executionDelegate.delegateType() == order.delegateType,
            'delegation type error'
        );
    }
    // modifies `src`
    function _arrayReplace(
        bytes memory src,
        bytes memory replacement,
        bytes memory mask
    ) internal view virtual {
        require(src.length == replacement.length);
        require(src.length == mask.length);
        for (uint256 i = 0; i < src.length; i++) {
            if (mask[i] != 0) {
                src[i] = replacement[i];
            }
        }
    }
    function _verifyInputSignature(Market.RunInput memory input) internal view virtual {
        bytes32 hash = keccak256(abi.encode(input.shared, input.details.length, input.details));
        address signer = ECDSA.recover(hash, input.v, input.r, input.s);
        require(signers[signer], 'Input signature error');
    }
    function _verifyOrderSignature(Market.Order memory order) internal view virtual {
        address orderSigner;
        if (order.signVersion == Market.SIGN_V1) {
            bytes32 orderHash = keccak256(
                abi.encode(
                    order.salt,
                    order.user,
                    order.network,
                    order.intent,
                    order.delegateType,
                    order.deadline,
                    order.currency,
                    order.dataMask,
                    order.items.length,
                    order.items
                )
            );
            orderSigner = ECDSA.recover(
                ECDSA.toEthSignedMessageHash(orderHash),
                order.v,
                order.r,
                order.s
            );
        } else {
            revert('unknown signature version');
        }
        require(orderSigner == order.user, 'Order signature does not match');
    }
    function _isNative(IERC20Upgradeable currency) internal view virtual returns (bool) {
        return address(currency) == address(0);
    }
    function _takePayment(
        bytes32 itemHash,
        IERC20Upgradeable currency,
        address from,
        uint256 amount
    ) internal virtual returns (uint256) {
        if (amount > 0) {
            if (_isNative(currency)) {
                return amount;
            } else {
                currency.safeTransferFrom(from, address(this), amount);
            }
        }
        return 0;
    }
    function _transferTo(
        IERC20Upgradeable currency,
        address to,
        uint256 amount
    ) internal virtual {
        if (amount > 0) {
            if (_isNative(currency)) {
                AddressUpgradeable.sendValue(payable(to), amount);
            } else {
                currency.safeTransfer(to, amount);
            }
        }
    }
    function _distributeFeeAndProfit(
        bytes32 itemHash,
        address seller,
        IERC20Upgradeable currency,
        Market.SettleDetail memory sd,
        uint256 price,
        uint256 netPrice
    ) internal virtual {
        require(price >= netPrice, 'price error');
        uint256 payment = netPrice;
        uint256 totalFeePct;
        for (uint256 i = 0; i < sd.fees.length; i++) {
            Market.Fee memory fee = sd.fees[i];
            totalFeePct += fee.percentage;
            uint256 amount = (price * fee.percentage) / RATE_BASE;
            payment -= amount;
            _transferTo(currency, fee.to, amount);
        }
        require(feeCapPct >= totalFeePct, 'total fee cap exceeded');
        _transferTo(currency, seller, payment);
        emit EvProfit(itemHash, address(currency), seller, payment);
    }
}
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
interface IDelegate {
    function delegateType() external view returns (uint256);
    function executeSell(
        address seller,
        address buyer,
        bytes calldata data
    ) external returns (bool);
    function executeBuy(
        address seller,
        address buyer,
        bytes calldata data
    ) external returns (bool);
    function executeBid(
        address seller,
        address previousBidder,
        address bidder,
        bytes calldata data
    ) external returns (bool);
    function executeAuctionComplete(
        address seller,
        address buyer,
        bytes calldata data
    ) external returns (bool);
    function executeAuctionRefund(
        address seller,
        address lastBidder,
        bytes calldata data
    ) external returns (bool);
}
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
import '@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol';
interface IWETHUpgradable is IERC20Upgradeable {
    function deposit() external payable;
    function withdraw(uint256 wad) external;
}
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
import './IDelegate.sol';
import './IWETHUpgradable.sol';
library Market {
    uint256 constant INTENT_SELL = 1;
    uint256 constant INTENT_AUCTION = 2;
    uint256 constant INTENT_BUY = 3;
    uint8 constant SIGN_V1 = 1;
    uint8 constant SIGN_V3 = 3;
    struct OrderItem {
        uint256 price;
        bytes data;
    }
    struct Order {
        uint256 salt;
        address user;
        uint256 network;
        uint256 intent;
        uint256 delegateType;
        uint256 deadline;
        IERC20Upgradeable currency;
        bytes dataMask;
        OrderItem[] items;
        // signature
        bytes32 r;
        bytes32 s;
        uint8 v;
        uint8 signVersion;
    }
    struct Fee {
        uint256 percentage;
        address to;
    }
    struct SettleDetail {
        Market.Op op;
        uint256 orderIdx;
        uint256 itemIdx;
        uint256 price;
        bytes32 itemHash;
        IDelegate executionDelegate;
        bytes dataReplacement;
        uint256 bidIncentivePct;
        uint256 aucMinIncrementPct;
        uint256 aucIncDurationSecs;
        Fee[] fees;
    }
    struct SettleShared {
        uint256 salt;
        uint256 deadline;
        uint256 amountToEth;
        uint256 amountToWeth;
        address user;
        bool canFail;
    }
    struct RunInput {
        Order[] orders;
        SettleDetail[] details;
        SettleShared shared;
        // signature
        bytes32 r;
        bytes32 s;
        uint8 v;
    }
    struct OngoingAuction {
        uint256 price;
        uint256 netPrice;
        uint256 endAt;
        address bidder;
    }
    enum InvStatus {
        NEW,
        AUCTION,
        COMPLETE,
        CANCELLED,
        REFUNDED
    }
    enum Op {
        INVALID,
        // off-chain
        COMPLETE_SELL_OFFER,
        COMPLETE_BUY_OFFER,
        CANCEL_OFFER,
        // auction
        BID,
        COMPLETE_AUCTION,
        REFUND_AUCTION,
        REFUND_AUCTION_STUCK_ITEM
    }
    enum DelegationType {
        INVALID,
        ERC721,
        ERC1155
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }
    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/utils/Initializable.sol)
pragma solidity ^0.8.0;
import "../../utils/AddressUpgradeable.sol";
/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;
    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;
    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");
        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
        }
    }
    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);
    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);
    bool private _paused;
    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Context_init_unchained();
        __Pausable_init_unchained();
    }
    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }
    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }
    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }
    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;
    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(
        IERC20Upgradeable token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)
pragma solidity ^0.8.0;
import "../Strings.sol";
/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }
    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }
    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }
    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }
    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }
        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }
        return (signer, RecoverError.NoError);
    }
    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }
    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\\x19Ethereum Signed Message:\
32", hash));
    }
    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\\x19Ethereum Signed Message:\
", Strings.toString(s.length), s));
    }
    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\\x19\\x01", domainSeparator, structHash));
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
        __Context_init_unchained();
    }
    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
import '@openzeppelin/contracts/token/ERC721/IERC721.sol';
import '@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol';
import '@openzeppelin/contracts/access/AccessControl.sol';
import './MarketConsts.sol';
import './IDelegate.sol';
contract ERC721Delegate is IDelegate, AccessControl, IERC721Receiver {
    bytes32 public constant DELEGATION_CALLER = keccak256('DELEGATION_CALLER');
    struct Pair {
        IERC721 token;
        uint256 tokenId;
    }
    constructor() {
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }
    function onERC721Received(
        address,
        address,
        uint256,
        bytes calldata
    ) external override returns (bytes4) {
        return this.onERC721Received.selector;
    }
    function decode(bytes calldata data) internal pure returns (Pair[] memory) {
        return abi.decode(data, (Pair[]));
    }
    function delegateType() external view returns (uint256) {
        // return uint256(Market.DelegationType.ERC721);
        return 1;
    }
    function executeSell(
        address seller,
        address buyer,
        bytes calldata data
    ) external onlyRole(DELEGATION_CALLER) returns (bool) {
        Pair[] memory pairs = decode(data);
        for (uint256 i = 0; i < pairs.length; i++) {
            Pair memory p = pairs[i];
            p.token.safeTransferFrom(seller, buyer, p.tokenId);
        }
        return true;
    }
    function executeBuy(
        address seller,
        address buyer,
        bytes calldata data
    ) external onlyRole(DELEGATION_CALLER) returns (bool) {
        Pair[] memory pairs = decode(data);
        for (uint256 i = 0; i < pairs.length; i++) {
            Pair memory p = pairs[i];
            p.token.safeTransferFrom(seller, buyer, p.tokenId);
        }
        return true;
    }
    function executeBid(
        address seller,
        address previousBidder,
        address, // bidder,
        bytes calldata data
    ) external onlyRole(DELEGATION_CALLER) returns (bool) {
        if (previousBidder == address(0)) {
            Pair[] memory pairs = decode(data);
            for (uint256 i = 0; i < pairs.length; i++) {
                Pair memory p = pairs[i];
                p.token.safeTransferFrom(seller, address(this), p.tokenId);
            }
        }
        return true;
    }
    function executeAuctionComplete(
        address, // seller,
        address buyer,
        bytes calldata data
    ) external onlyRole(DELEGATION_CALLER) returns (bool) {
        Pair[] memory pairs = decode(data);
        for (uint256 i = 0; i < pairs.length; i++) {
            Pair memory p = pairs[i];
            p.token.safeTransferFrom(address(this), buyer, p.tokenId);
        }
        return true;
    }
    function executeAuctionRefund(
        address seller,
        address, // lastBidder,
        bytes calldata data
    ) external onlyRole(DELEGATION_CALLER) returns (bool) {
        Pair[] memory pairs = decode(data);
        for (uint256 i = 0; i < pairs.length; i++) {
            Pair memory p = pairs[i];
            p.token.safeTransferFrom(address(this), seller, p.tokenId);
        }
        return true;
    }
    function transferBatch(Pair[] memory pairs, address to) public {
        for (uint256 i = 0; i < pairs.length; i++) {
            Pair memory p = pairs[i];
            p.token.safeTransferFrom(msg.sender, to, p.tokenId);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/AccessControl.sol)
pragma solidity ^0.8.0;
import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";
/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }
    mapping(bytes32 => RoleData) private _roles;
    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }
    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");
        _revokeRole(role, account);
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }
    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }
    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
import './IDelegate.sol';
import './IWETHUpgradable.sol';
library Market {
    uint256 constant INTENT_SELL = 1;
    uint256 constant INTENT_AUCTION = 2;
    uint256 constant INTENT_BUY = 3;
    uint8 constant SIGN_V1 = 1;
    uint8 constant SIGN_V3 = 3;
    struct OrderItem {
        uint256 price;
        bytes data;
    }
    struct Order {
        uint256 salt;
        address user;
        uint256 network;
        uint256 intent;
        uint256 delegateType;
        uint256 deadline;
        IERC20Upgradeable currency;
        bytes dataMask;
        OrderItem[] items;
        // signature
        bytes32 r;
        bytes32 s;
        uint8 v;
        uint8 signVersion;
    }
    struct Fee {
        uint256 percentage;
        address to;
    }
    struct SettleDetail {
        Market.Op op;
        uint256 orderIdx;
        uint256 itemIdx;
        uint256 price;
        bytes32 itemHash;
        IDelegate executionDelegate;
        bytes dataReplacement;
        uint256 bidIncentivePct;
        uint256 aucMinIncrementPct;
        uint256 aucIncDurationSecs;
        Fee[] fees;
    }
    struct SettleShared {
        uint256 salt;
        uint256 deadline;
        uint256 amountToEth;
        uint256 amountToWeth;
        address user;
        bool canFail;
    }
    struct RunInput {
        Order[] orders;
        SettleDetail[] details;
        SettleShared shared;
        // signature
        bytes32 r;
        bytes32 s;
        uint8 v;
    }
    struct OngoingAuction {
        uint256 price;
        uint256 netPrice;
        uint256 endAt;
        address bidder;
    }
    enum InvStatus {
        NEW,
        AUCTION,
        COMPLETE,
        CANCELLED,
        REFUNDED
    }
    enum Op {
        INVALID,
        // off-chain
        COMPLETE_SELL_OFFER,
        COMPLETE_BUY_OFFER,
        CANCEL_OFFER,
        // auction
        BID,
        COMPLETE_AUCTION,
        REFUND_AUCTION,
        REFUND_AUCTION_STUCK_ITEM
    }
    enum DelegationType {
        INVALID,
        ERC721,
        ERC1155
    }
}
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
interface IDelegate {
    function delegateType() external view returns (uint256);
    function executeSell(
        address seller,
        address buyer,
        bytes calldata data
    ) external returns (bool);
    function executeBuy(
        address seller,
        address buyer,
        bytes calldata data
    ) external returns (bool);
    function executeBid(
        address seller,
        address previousBidder,
        address bidder,
        bytes calldata data
    ) external returns (bool);
    function executeAuctionComplete(
        address seller,
        address buyer,
        bytes calldata data
    ) external returns (bool);
    function executeAuctionRefund(
        address seller,
        address lastBidder,
        bytes calldata data
    ) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)
pragma solidity ^0.8.0;
/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
import '@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol';
interface IWETHUpgradable is IERC20Upgradeable {
    function deposit() external payable;
    function withdraw(uint256 wad) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import './TokenSplitter.sol';
import './FeeSharingSetter.sol';
import './IWETH.sol';
import '@openzeppelin/contracts/access/AccessControl.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/security/Pausable.sol';
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/utils/Address.sol';
contract FeeManagement is AccessControl, Pausable, ReentrancyGuard {
    using SafeERC20 for IERC20;
    using SafeERC20 for IWETH;
    bytes32 public constant OPERATOR_ROLE = keccak256('OPERATOR_ROLE');
    TokenSplitter public immutable tokenSplitter;
    FeeSharingSetter public immutable feeSetter;
    IWETH public immutable weth;
    constructor(
        TokenSplitter tokenSplitter_,
        FeeSharingSetter feeSetter_,
        IWETH weth_,
        address operator_,
        address admin_
    ) {
        tokenSplitter = tokenSplitter_;
        feeSetter = feeSetter_;
        weth = weth_;
        if (admin_ == address(0)) {
            admin_ = msg.sender;
        }
        _grantRole(DEFAULT_ADMIN_ROLE, admin_);
        _grantRole(OPERATOR_ROLE, admin_);
        if (operator_ != address(0)) {
            _grantRole(OPERATOR_ROLE, operator_);
        }
    }
    receive() external payable {}
    function pause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _pause();
    }
    function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _unpause();
    }
    // withdraw tokens
    function withdraw(address to, IERC20[] calldata tokens)
        external
        nonReentrant
        whenNotPaused
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        require(to != address(0), 'Withdraw: address(0) cannot be recipient');
        for (uint256 i = 0; i < tokens.length; i++) {
            IERC20 currency = tokens[i];
            if (address(currency) == address(0)) {
                uint256 balance = address(this).balance;
                if (balance > 0) {
                    Address.sendValue(payable(to), balance);
                }
            } else {
                uint256 balance = currency.balanceOf(address(this));
                if (balance > 0) {
                    currency.safeTransfer(to, balance);
                }
            }
        }
    }
    function canRelease() external view returns (bool) {
        return
            block.number >
            feeSetter.rewardDurationInBlocks() + feeSetter.lastRewardDistributionBlock();
    }
    function releaseAndUpdateReward(IERC20[] memory tokens, address[] memory accounts)
        external
        nonReentrant
        whenNotPaused
        onlyRole(OPERATOR_ROLE)
    {
        _release(tokens);
        // release x2y2 to pools, skipped when the balance is less than 1 token (the release can be called by anyone)
        if (tokenSplitter.x2y2Token().balanceOf(address(tokenSplitter)) >= 1 ether) {
            for (uint256 i = 0; i < accounts.length; i++) {
                tokenSplitter.releaseTokens(accounts[i]);
            }
        }
        feeSetter.updateRewards();
    }
    function release(IERC20[] memory tokens)
        external
        nonReentrant
        whenNotPaused
        onlyRole(OPERATOR_ROLE)
    {
        _release(tokens);
    }
    function _release(IERC20[] memory tokens) internal {
        uint256 balance = address(this).balance;
        if (balance > 0) {
            weth.deposit{value: balance}();
        }
        balance = weth.balanceOf(address(this));
        if (balance > 0) {
            weth.safeTransfer(address(feeSetter), balance);
        }
        for (uint256 i = 0; i < tokens.length; i++) {
            IERC20 currency = tokens[i];
            balance = currency.balanceOf(address(this));
            if (balance > 0) {
                currency.safeTransfer(address(feeSetter), balance);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import {Ownable} from '@openzeppelin/contracts/access/Ownable.sol';
import {ReentrancyGuard} from '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import {IERC20, SafeERC20} from '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
/**
 * @title TokenSplitter
 * @notice It splits X2Y2 to team/treasury/trading volume reward accounts based on shares.
 */
contract TokenSplitter is Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;
    struct AccountInfo {
        uint256 shares;
        uint256 tokensDistributedToAccount;
    }
    uint256 public immutable TOTAL_SHARES;
    IERC20 public immutable x2y2Token;
    // Total tokens distributed across all accounts
    uint256 public totalTokensDistributed;
    mapping(address => AccountInfo) public accountInfo;
    event NewSharesOwner(address indexed oldRecipient, address indexed newRecipient);
    event TokensTransferred(address indexed account, uint256 amount);
    /**
     * @notice Constructor
     * @param _accounts array of accounts addresses
     * @param _shares array of shares per account
     * @param _x2y2Token address of the X2Y2 token
     */
    constructor(
        address[] memory _accounts,
        uint256[] memory _shares,
        address _x2y2Token
    ) {
        require(_accounts.length == _shares.length, 'Splitter: Length differ');
        require(_accounts.length > 0, 'Splitter: Length must be > 0');
        uint256 currentShares;
        for (uint256 i = 0; i < _accounts.length; i++) {
            require(_shares[i] > 0, 'Splitter: Shares are 0');
            currentShares += _shares[i];
            accountInfo[_accounts[i]].shares = _shares[i];
        }
        TOTAL_SHARES = currentShares;
        x2y2Token = IERC20(_x2y2Token);
    }
    /**
     * @notice Release X2Y2 tokens to the account
     * @param account address of the account
     */
    function releaseTokens(address account) external nonReentrant {
        require(accountInfo[account].shares > 0, 'Splitter: Account has no share');
        // Calculate amount to transfer to the account
        uint256 totalTokensReceived = x2y2Token.balanceOf(address(this)) + totalTokensDistributed;
        uint256 pendingRewards = ((totalTokensReceived * accountInfo[account].shares) /
            TOTAL_SHARES) - accountInfo[account].tokensDistributedToAccount;
        // Revert if equal to 0
        require(pendingRewards != 0, 'Splitter: Nothing to transfer');
        accountInfo[account].tokensDistributedToAccount += pendingRewards;
        totalTokensDistributed += pendingRewards;
        // Transfer funds to account
        x2y2Token.safeTransfer(account, pendingRewards);
        emit TokensTransferred(account, pendingRewards);
    }
    /**
     * @notice Update share recipient
     * @param _newRecipient address of the new recipient
     * @param _currentRecipient address of the current recipient
     */
    function updateSharesOwner(address _newRecipient, address _currentRecipient)
        external
        onlyOwner
    {
        require(
            accountInfo[_currentRecipient].shares > 0,
            'Owner: Current recipient has no shares'
        );
        require(accountInfo[_newRecipient].shares == 0, 'Owner: New recipient has existing shares');
        // Copy shares to new recipient
        accountInfo[_newRecipient].shares = accountInfo[_currentRecipient].shares;
        accountInfo[_newRecipient].tokensDistributedToAccount = accountInfo[_currentRecipient]
            .tokensDistributedToAccount;
        // Reset existing shares
        accountInfo[_currentRecipient].shares = 0;
        accountInfo[_currentRecipient].tokensDistributedToAccount = 0;
        emit NewSharesOwner(_currentRecipient, _newRecipient);
    }
    /**
     * @notice Retrieve amount of X2Y2 tokens that can be transferred
     * @param account address of the account
     */
    function calculatePendingRewards(address account) external view returns (uint256) {
        if (accountInfo[account].shares == 0) {
            return 0;
        }
        uint256 totalTokensReceived = x2y2Token.balanceOf(address(this)) + totalTokensDistributed;
        uint256 pendingRewards = ((totalTokensReceived * accountInfo[account].shares) /
            TOTAL_SHARES) - accountInfo[account].tokensDistributedToAccount;
        return pendingRewards;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import {AccessControl} from '@openzeppelin/contracts/access/AccessControl.sol';
import {ReentrancyGuard} from '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import {IERC20, SafeERC20} from '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import {EnumerableSet} from '@openzeppelin/contracts/utils/structs/EnumerableSet.sol';
import {FeeSharingSystem} from './FeeSharingSystem.sol';
import {TokenDistributor} from './TokenDistributor.sol';
import {IRewardConvertor} from './IRewardConvertor.sol';
import {IMintableERC20} from './IMintableERC20.sol';
import {ITokenStaked} from './ITokenStaked.sol';
/**
 * @title FeeSharingSetter
 * @notice It receives exchange fees and owns the FeeSharingSystem contract.
 * It can plug to AMMs for converting all received currencies to WETH.
 */
contract FeeSharingSetter is ReentrancyGuard, AccessControl {
    using EnumerableSet for EnumerableSet.AddressSet;
    using SafeERC20 for IERC20;
    // Operator role
    bytes32 public constant OPERATOR_ROLE = keccak256('OPERATOR_ROLE');
    // Min duration for each fee-sharing period (in blocks)
    uint256 public immutable MIN_REWARD_DURATION_IN_BLOCKS;
    // Max duration for each fee-sharing period (in blocks)
    uint256 public immutable MAX_REWARD_DURATION_IN_BLOCKS;
    IERC20 public immutable x2y2Token;
    IERC20 public immutable rewardToken;
    FeeSharingSystem public feeSharingSystem;
    TokenDistributor public immutable tokenDistributor;
    // Reward convertor (tool to convert other currencies to rewardToken)
    IRewardConvertor public rewardConvertor;
    // Last reward block of distribution
    uint256 public lastRewardDistributionBlock;
    // Next reward duration in blocks
    uint256 public nextRewardDurationInBlocks;
    // Reward duration in blocks
    uint256 public rewardDurationInBlocks;
    // Set of addresses that are staking only the fee sharing
    EnumerableSet.AddressSet private _feeStakingAddresses;
    mapping(address => bool) public feeStakingAddressIStaked;
    event ConversionToRewardToken(
        address indexed token,
        uint256 amountConverted,
        uint256 amountReceived
    );
    event FeeStakingAddressesAdded(address[] feeStakingAddresses);
    event FeeStakingAddressesRemoved(address[] feeStakingAddresses);
    event NewRewardDurationInBlocks(uint256 rewardDurationInBlocks);
    event NewRewardConvertor(address rewardConvertor);
    /**
     * @notice Constructor
     * @param _feeSharingSystem address of the fee sharing system
     * @param _minRewardDurationInBlocks minimum reward duration in blocks
     * @param _maxRewardDurationInBlocks maximum reward duration in blocks
     * @param _rewardDurationInBlocks reward duration between two updates in blocks
     */
    constructor(
        address _feeSharingSystem,
        uint256 _minRewardDurationInBlocks,
        uint256 _maxRewardDurationInBlocks,
        uint256 _rewardDurationInBlocks
    ) {
        require(
            (_rewardDurationInBlocks <= _maxRewardDurationInBlocks) &&
                (_rewardDurationInBlocks >= _minRewardDurationInBlocks),
            'Owner: Reward duration in blocks outside of range'
        );
        MIN_REWARD_DURATION_IN_BLOCKS = _minRewardDurationInBlocks;
        MAX_REWARD_DURATION_IN_BLOCKS = _maxRewardDurationInBlocks;
        feeSharingSystem = FeeSharingSystem(_feeSharingSystem);
        rewardToken = feeSharingSystem.rewardToken();
        x2y2Token = feeSharingSystem.x2y2Token();
        tokenDistributor = feeSharingSystem.tokenDistributor();
        rewardDurationInBlocks = _rewardDurationInBlocks;
        nextRewardDurationInBlocks = _rewardDurationInBlocks;
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }
    /**
     * @notice Update the reward per block (in rewardToken)
     * @dev It automatically retrieves the number of pending WETH and adjusts
     * based on the balance of X2Y2 in fee-staking addresses that exist in the set.
     */
    function updateRewards() external onlyRole(OPERATOR_ROLE) {
        if (lastRewardDistributionBlock > 0) {
            require(
                block.number > (rewardDurationInBlocks + lastRewardDistributionBlock),
                'Reward: Too early to add'
            );
        }
        // Adjust for this period
        if (rewardDurationInBlocks != nextRewardDurationInBlocks) {
            rewardDurationInBlocks = nextRewardDurationInBlocks;
        }
        lastRewardDistributionBlock = block.number;
        // Calculate the reward to distribute as the balance held by this address
        uint256 reward = rewardToken.balanceOf(address(this));
        require(reward != 0, 'Reward: Nothing to distribute');
        // Check if there is any address eligible for fee-sharing only
        uint256 numberAddressesForFeeStaking = _feeStakingAddresses.length();
        // If there are eligible addresses for fee-sharing only, calculate their shares
        if (numberAddressesForFeeStaking > 0) {
            uint256[] memory x2y2Balances = new uint256[](numberAddressesForFeeStaking);
            (uint256 totalAmountStaked, ) = tokenDistributor.userInfo(address(feeSharingSystem));
            for (uint256 i = 0; i < numberAddressesForFeeStaking; i++) {
                address a = _feeStakingAddresses.at(i);
                uint256 balance = x2y2Token.balanceOf(a);
                if (feeStakingAddressIStaked[a]) {
                    balance = ITokenStaked(a).getTotalStaked();
                }
                totalAmountStaked += balance;
                x2y2Balances[i] = balance;
            }
            // Only apply the logic if the totalAmountStaked > 0 (to prevent division by 0)
            if (totalAmountStaked > 0) {
                uint256 adjustedReward = reward;
                for (uint256 i = 0; i < numberAddressesForFeeStaking; i++) {
                    uint256 amountToTransfer = (x2y2Balances[i] * reward) / totalAmountStaked;
                    if (amountToTransfer > 0) {
                        adjustedReward -= amountToTransfer;
                        rewardToken.safeTransfer(_feeStakingAddresses.at(i), amountToTransfer);
                    }
                }
                // Adjust reward accordingly
                reward = adjustedReward;
            }
        }
        // Transfer tokens to fee sharing system
        rewardToken.safeTransfer(address(feeSharingSystem), reward);
        // Update rewards
        feeSharingSystem.updateRewards(reward, rewardDurationInBlocks);
    }
    /**
     * @notice Convert currencies to reward token
     * @dev Function only usable only for whitelisted currencies (where no potential side effect)
     * @param token address of the token to sell
     * @param additionalData additional data (e.g., slippage)
     */
    function convertCurrencyToRewardToken(address token, bytes calldata additionalData)
        external
        nonReentrant
        onlyRole(OPERATOR_ROLE)
    {
        require(address(rewardConvertor) != address(0), 'Convert: RewardConvertor not set');
        require(token != address(rewardToken), 'Convert: Cannot be reward token');
        uint256 amountToConvert = IERC20(token).balanceOf(address(this));
        require(amountToConvert != 0, 'Convert: Amount to convert must be > 0');
        // Adjust allowance for this transaction only
        IERC20(token).safeIncreaseAllowance(address(rewardConvertor), amountToConvert);
        // Exchange token to reward token
        uint256 amountReceived = rewardConvertor.convert(
            token,
            address(rewardToken),
            amountToConvert,
            additionalData
        );
        emit ConversionToRewardToken(token, amountToConvert, amountReceived);
    }
    /**
     * @notice Add staking addresses
     * @param _stakingAddresses array of addresses eligible for fee-sharing only
     */
    function addFeeStakingAddresses(
        address[] calldata _stakingAddresses,
        bool[] calldata _addressIStaked
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(_stakingAddresses.length == _addressIStaked.length, 'Owner: param length error');
        for (uint256 i = 0; i < _stakingAddresses.length; i++) {
            require(
                !_feeStakingAddresses.contains(_stakingAddresses[i]),
                'Owner: Address already registered'
            );
            _feeStakingAddresses.add(_stakingAddresses[i]);
            if (_addressIStaked[i]) {
                feeStakingAddressIStaked[_stakingAddresses[i]] = true;
            }
        }
        emit FeeStakingAddressesAdded(_stakingAddresses);
    }
    /**
     * @notice Remove staking addresses
     * @param _stakingAddresses array of addresses eligible for fee-sharing only
     */
    function removeFeeStakingAddresses(address[] calldata _stakingAddresses)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        for (uint256 i = 0; i < _stakingAddresses.length; i++) {
            require(
                _feeStakingAddresses.contains(_stakingAddresses[i]),
                'Owner: Address not registered'
            );
            _feeStakingAddresses.remove(_stakingAddresses[i]);
            if (feeStakingAddressIStaked[_stakingAddresses[i]]) {
                delete feeStakingAddressIStaked[_stakingAddresses[i]];
            }
        }
        emit FeeStakingAddressesRemoved(_stakingAddresses);
    }
    /**
     * @notice Set new reward duration in blocks for next update
     * @param _newRewardDurationInBlocks number of blocks for new reward period
     */
    function setNewRewardDurationInBlocks(uint256 _newRewardDurationInBlocks)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
    {
        require(
            (_newRewardDurationInBlocks <= MAX_REWARD_DURATION_IN_BLOCKS) &&
                (_newRewardDurationInBlocks >= MIN_REWARD_DURATION_IN_BLOCKS),
            'Owner: New reward duration in blocks outside of range'
        );
        nextRewardDurationInBlocks = _newRewardDurationInBlocks;
        emit NewRewardDurationInBlocks(_newRewardDurationInBlocks);
    }
    /**
     * @notice Set reward convertor contract
     * @param _rewardConvertor address of the reward convertor (set to null to deactivate)
     */
    function setRewardConvertor(address _rewardConvertor) external onlyRole(DEFAULT_ADMIN_ROLE) {
        rewardConvertor = IRewardConvertor(_rewardConvertor);
        emit NewRewardConvertor(_rewardConvertor);
    }
    /**
     * @notice See addresses eligible for fee-staking
     */
    function viewFeeStakingAddresses() external view returns (address[] memory) {
        uint256 length = _feeStakingAddresses.length();
        address[] memory feeStakingAddresses = new address[](length);
        for (uint256 i = 0; i < length; i++) {
            feeStakingAddresses[i] = _feeStakingAddresses.at(i);
        }
        return (feeStakingAddresses);
    }
}
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.0;
pragma abicoder v2;
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
interface IWETH is IERC20 {
    function deposit() external payable;
    function withdraw(uint256 wad) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/AccessControl.sol)
pragma solidity ^0.8.0;
import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";
/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }
    mapping(bytes32 => RoleData) private _roles;
    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }
    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");
        _revokeRole(role, account);
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }
    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }
    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);
    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);
    bool private _paused;
    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }
    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }
    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor() {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../../../utils/Address.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;
    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/structs/EnumerableSet.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.
    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];
        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.
            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;
            if (lastIndex != toDeleteIndex) {
                bytes32 lastvalue = set._values[lastIndex];
                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastvalue;
                // Update the index for the moved value
                set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
            }
            // Delete the slot where the moved value was stored
            set._values.pop();
            // Delete the index for the deleted slot
            delete set._indexes[value];
            return true;
        } else {
            return false;
        }
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }
    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }
    // Bytes32Set
    struct Bytes32Set {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }
    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }
    // AddressSet
    struct AddressSet {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }
    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;
        assembly {
            result := store
        }
        return result;
    }
    // UintSet
    struct UintSet {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;
        assembly {
            result := store
        }
        return result;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import {AccessControl} from '@openzeppelin/contracts/access/AccessControl.sol';
import {IERC20, SafeERC20} from '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import {ReentrancyGuard} from '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import {TokenDistributor} from './TokenDistributor.sol';
import {IStakeFor} from './IStakeFor.sol';
/**
 * @title FeeSharingSystem
 * @notice It handles the distribution of fees using
 * WETH along with the auto-compounding of X2Y2.
 */
contract FeeSharingSystem is ReentrancyGuard, AccessControl, IStakeFor {
    using SafeERC20 for IERC20;
    // for `depositFor` call
    bytes32 public constant DEPOSIT_ROLE = keccak256('DEPOSIT_ROLE');
    // for `updateRewards()`
    bytes32 public constant REWARD_UPDATE_ROLE = keccak256('REWARD_UPDATE_ROLE');
    struct UserInfo {
        uint256 shares; // shares of token staked
        uint256 userRewardPerTokenPaid; // user reward per token paid
        uint256 rewards; // pending rewards
    }
    // Precision factor for calculating rewards and exchange rate
    uint256 public constant PRECISION_FACTOR = 10**18;
    IERC20 public immutable x2y2Token;
    IERC20 public immutable rewardToken;
    TokenDistributor public immutable tokenDistributor;
    // Reward rate (block)
    uint256 public currentRewardPerBlock;
    // Last reward adjustment block number
    uint256 public lastRewardAdjustment;
    // Last update block for rewards
    uint256 public lastUpdateBlock;
    // Current end block for the current reward period
    uint256 public periodEndBlock;
    // Reward per token stored
    uint256 public rewardPerTokenStored;
    // Total existing shares
    uint256 public totalShares;
    mapping(address => UserInfo) public userInfo;
    event Deposit(address indexed user, uint256 amount, uint256 harvestedAmount);
    event Harvest(address indexed user, uint256 harvestedAmount);
    event NewRewardPeriod(uint256 numberBlocks, uint256 rewardPerBlock, uint256 reward);
    event Withdraw(address indexed user, uint256 amount, uint256 harvestedAmount);
    /**
     * @notice Constructor
     * @param _x2y2Token address of the token staked
     * @param _rewardToken address of the reward token
     * @param _tokenDistributor address of the token distributor contract
     */
    constructor(
        address _x2y2Token,
        address _rewardToken,
        address _tokenDistributor
    ) {
        rewardToken = IERC20(_rewardToken);
        x2y2Token = IERC20(_x2y2Token);
        tokenDistributor = TokenDistributor(_tokenDistributor);
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }
    /**
     * @notice deposit on behalf of `user`, must be called on fresh deposit only
     * @param user deposit user
     * @param amount amount to deposit
     */
    function depositFor(address user, uint256 amount)
        external
        override
        nonReentrant
        onlyRole(DEPOSIT_ROLE)
        returns (bool)
    {
        require(amount >= PRECISION_FACTOR, 'Deposit: Amount must be >= 1 X2Y2');
        // Auto compounds for everyone
        tokenDistributor.harvestAndCompound();
        // Update reward for user
        _updateReward(user);
        // Retrieve total amount staked by this contract
        (uint256 totalAmountStaked, ) = tokenDistributor.userInfo(address(this));
        // transfer stakingToken from **sender**
        x2y2Token.safeTransferFrom(msg.sender, address(this), amount);
        uint256 currentShares;
        // Calculate the number of shares to issue for the user
        if (totalShares != 0) {
            currentShares = (amount * totalShares) / totalAmountStaked;
            // This is a sanity check to prevent deposit for 0 shares
            require(currentShares != 0, 'Deposit: Fail');
        } else {
            currentShares = amount;
        }
        // Adjust internal shares
        userInfo[user].shares += currentShares;
        totalShares += currentShares;
        // Verify X2Y2 token allowance and adjust if necessary
        _checkAndAdjustX2Y2TokenAllowanceIfRequired(amount, address(tokenDistributor));
        // Deposit user amount in the token distributor contract
        tokenDistributor.deposit(amount);
        emit Deposit(user, amount, 0);
        return true;
    }
    /**
     * @notice Deposit staked tokens (and collect reward tokens if requested)
     * @param amount amount to deposit (in X2Y2)
     * @param claimRewardToken whether to claim reward tokens
     * @dev There is a limit of 1 X2Y2 per deposit to prevent potential manipulation of current shares
     */
    function deposit(uint256 amount, bool claimRewardToken) external nonReentrant {
        require(amount >= PRECISION_FACTOR, 'Deposit: Amount must be >= 1 X2Y2');
        // Auto compounds for everyone
        tokenDistributor.harvestAndCompound();
        // Update reward for user
        _updateReward(msg.sender);
        // Retrieve total amount staked by this contract
        (uint256 totalAmountStaked, ) = tokenDistributor.userInfo(address(this));
        // Transfer X2Y2 tokens to this address
        x2y2Token.safeTransferFrom(msg.sender, address(this), amount);
        uint256 currentShares;
        // Calculate the number of shares to issue for the user
        if (totalShares != 0) {
            currentShares = (amount * totalShares) / totalAmountStaked;
            // This is a sanity check to prevent deposit for 0 shares
            require(currentShares != 0, 'Deposit: Fail');
        } else {
            currentShares = amount;
        }
        // Adjust internal shares
        userInfo[msg.sender].shares += currentShares;
        totalShares += currentShares;
        uint256 pendingRewards;
        if (claimRewardToken) {
            // Fetch pending rewards
            pendingRewards = userInfo[msg.sender].rewards;
            if (pendingRewards > 0) {
                userInfo[msg.sender].rewards = 0;
                rewardToken.safeTransfer(msg.sender, pendingRewards);
            }
        }
        // Verify X2Y2 token allowance and adjust if necessary
        _checkAndAdjustX2Y2TokenAllowanceIfRequired(amount, address(tokenDistributor));
        // Deposit user amount in the token distributor contract
        tokenDistributor.deposit(amount);
        emit Deposit(msg.sender, amount, pendingRewards);
    }
    /**
     * @notice Harvest reward tokens that are pending
     */
    function harvest() external nonReentrant {
        // Auto compounds for everyone
        tokenDistributor.harvestAndCompound();
        // Update reward for user
        _updateReward(msg.sender);
        // Retrieve pending rewards
        uint256 pendingRewards = userInfo[msg.sender].rewards;
        // If pending rewards are null, revert
        require(pendingRewards > 0, 'Harvest: Pending rewards must be > 0');
        // Adjust user rewards and transfer
        userInfo[msg.sender].rewards = 0;
        // Transfer reward token to sender
        rewardToken.safeTransfer(msg.sender, pendingRewards);
        emit Harvest(msg.sender, pendingRewards);
    }
    /**
     * @notice Withdraw staked tokens (and collect reward tokens if requested)
     * @param shares shares to withdraw
     * @param claimRewardToken whether to claim reward tokens
     */
    function withdraw(uint256 shares, bool claimRewardToken) external nonReentrant {
        require(
            (shares > 0) && (shares <= userInfo[msg.sender].shares),
            'Withdraw: Shares equal to 0 or larger than user shares'
        );
        _withdraw(shares, claimRewardToken);
    }
    /**
     * @notice Withdraw all staked tokens (and collect reward tokens if requested)
     * @param claimRewardToken whether to claim reward tokens
     */
    function withdrawAll(bool claimRewardToken) external nonReentrant {
        _withdraw(userInfo[msg.sender].shares, claimRewardToken);
    }
    /**
     * @notice Update the reward per block (in rewardToken)
     * @dev Only callable by owner. Owner is meant to be another smart contract.
     */
    function updateRewards(uint256 reward, uint256 rewardDurationInBlocks)
        external
        onlyRole(REWARD_UPDATE_ROLE)
    {
        // Adjust the current reward per block
        if (block.number >= periodEndBlock) {
            currentRewardPerBlock = reward / rewardDurationInBlocks;
        } else {
            currentRewardPerBlock =
                (reward + ((periodEndBlock - block.number) * currentRewardPerBlock)) /
                rewardDurationInBlocks;
        }
        lastUpdateBlock = block.number;
        periodEndBlock = block.number + rewardDurationInBlocks;
        emit NewRewardPeriod(rewardDurationInBlocks, currentRewardPerBlock, reward);
    }
    /**
     * @notice Calculate pending rewards (WETH) for a user
     * @param user address of the user
     */
    function calculatePendingRewards(address user) external view returns (uint256) {
        return _calculatePendingRewards(user);
    }
    /**
     * @notice Calculate value of X2Y2 for a user given a number of shares owned
     * @param user address of the user
     */
    function calculateSharesValueInX2Y2(address user) external view returns (uint256) {
        // Retrieve amount staked
        (uint256 totalAmountStaked, ) = tokenDistributor.userInfo(address(this));
        // Adjust for pending rewards
        totalAmountStaked += tokenDistributor.calculatePendingRewards(address(this));
        // Return user pro-rata of total shares
        return
            userInfo[user].shares == 0
                ? 0
                : (totalAmountStaked * userInfo[user].shares) / totalShares;
    }
    /**
     * @notice Calculate price of one share (in X2Y2 token)
     * Share price is expressed times 1e18
     */
    function calculateSharePriceInX2Y2() external view returns (uint256) {
        (uint256 totalAmountStaked, ) = tokenDistributor.userInfo(address(this));
        // Adjust for pending rewards
        totalAmountStaked += tokenDistributor.calculatePendingRewards(address(this));
        return
            totalShares == 0
                ? PRECISION_FACTOR
                : (totalAmountStaked * PRECISION_FACTOR) / (totalShares);
    }
    /**
     * @notice Return last block where trading rewards were distributed
     */
    function lastRewardBlock() external view returns (uint256) {
        return _lastRewardBlock();
    }
    /**
     * @notice Calculate pending rewards for a user
     * @param user address of the user
     */
    function _calculatePendingRewards(address user) internal view returns (uint256) {
        return
            ((userInfo[user].shares *
                (_rewardPerToken() - (userInfo[user].userRewardPerTokenPaid))) / PRECISION_FACTOR) +
            userInfo[user].rewards;
    }
    /**
     * @notice Check current allowance and adjust if necessary
     * @param _amount amount to transfer
     * @param _to token to transfer
     */
    function _checkAndAdjustX2Y2TokenAllowanceIfRequired(uint256 _amount, address _to) internal {
        if (x2y2Token.allowance(address(this), _to) < _amount) {
            x2y2Token.approve(_to, type(uint256).max);
        }
    }
    /**
     * @notice Return last block where rewards must be distributed
     */
    function _lastRewardBlock() internal view returns (uint256) {
        return block.number < periodEndBlock ? block.number : periodEndBlock;
    }
    /**
     * @notice Return reward per token
     */
    function _rewardPerToken() internal view returns (uint256) {
        if (totalShares == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored +
            ((_lastRewardBlock() - lastUpdateBlock) * (currentRewardPerBlock * PRECISION_FACTOR)) /
            totalShares;
    }
    /**
     * @notice Update reward for a user account
     * @param _user address of the user
     */
    function _updateReward(address _user) internal {
        if (block.number != lastUpdateBlock) {
            rewardPerTokenStored = _rewardPerToken();
            lastUpdateBlock = _lastRewardBlock();
        }
        userInfo[_user].rewards = _calculatePendingRewards(_user);
        userInfo[_user].userRewardPerTokenPaid = rewardPerTokenStored;
    }
    /**
     * @notice Withdraw staked tokens (and collect reward tokens if requested)
     * @param shares shares to withdraw
     * @param claimRewardToken whether to claim reward tokens
     */
    function _withdraw(uint256 shares, bool claimRewardToken) internal {
        // Auto compounds for everyone
        tokenDistributor.harvestAndCompound();
        // Update reward for user
        _updateReward(msg.sender);
        // Retrieve total amount staked and calculated current amount (in X2Y2)
        (uint256 totalAmountStaked, ) = tokenDistributor.userInfo(address(this));
        uint256 currentAmount = (totalAmountStaked * shares) / totalShares;
        userInfo[msg.sender].shares -= shares;
        totalShares -= shares;
        // Withdraw amount equivalent in shares
        tokenDistributor.withdraw(currentAmount);
        uint256 pendingRewards;
        if (claimRewardToken) {
            // Fetch pending rewards
            pendingRewards = userInfo[msg.sender].rewards;
            if (pendingRewards > 0) {
                userInfo[msg.sender].rewards = 0;
                rewardToken.safeTransfer(msg.sender, pendingRewards);
            }
        }
        // Transfer X2Y2 tokens to sender
        x2y2Token.safeTransfer(msg.sender, currentAmount);
        emit Withdraw(msg.sender, currentAmount, pendingRewards);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import {ReentrancyGuard} from '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import {IERC20, SafeERC20} from '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import {IMintableERC20} from './IMintableERC20.sol';
/**
 * @title TokenDistributor
 * @notice It handles the distribution of X2Y2 token.
 * It auto-adjusts block rewards over a set number of periods.
 */
contract TokenDistributor is ReentrancyGuard {
    using SafeERC20 for IERC20;
    using SafeERC20 for IMintableERC20;
    struct StakingPeriod {
        uint256 rewardPerBlockForStaking;
        uint256 rewardPerBlockForOthers;
        uint256 periodLengthInBlock;
    }
    struct UserInfo {
        uint256 amount; // Amount of staked tokens provided by user
        uint256 rewardDebt; // Reward debt
    }
    // Precision factor for calculating rewards
    uint256 public constant PRECISION_FACTOR = 10**12;
    IMintableERC20 public immutable x2y2Token;
    address public immutable tokenSplitter;
    // Number of reward periods
    uint256 public immutable NUMBER_PERIODS;
    // Block number when rewards start
    uint256 public immutable START_BLOCK;
    // Accumulated tokens per share
    uint256 public accTokenPerShare;
    // Current phase for rewards
    uint256 public currentPhase;
    // Block number when rewards end
    uint256 public endBlock;
    // Block number of the last update
    uint256 public lastRewardBlock;
    // Tokens distributed per block for other purposes (team + treasury + trading rewards)
    uint256 public rewardPerBlockForOthers;
    // Tokens distributed per block for staking
    uint256 public rewardPerBlockForStaking;
    // Total amount staked
    uint256 public totalAmountStaked;
    mapping(uint256 => StakingPeriod) public stakingPeriod;
    mapping(address => UserInfo) public userInfo;
    event Compound(address indexed user, uint256 harvestedAmount);
    event Deposit(address indexed user, uint256 amount, uint256 harvestedAmount);
    event NewRewardsPerBlock(
        uint256 indexed currentPhase,
        uint256 startBlock,
        uint256 rewardPerBlockForStaking,
        uint256 rewardPerBlockForOthers
    );
    event Withdraw(address indexed user, uint256 amount, uint256 harvestedAmount);
    /**
     * @notice Constructor
     * @param _x2y2Token token address
     * @param _tokenSplitter token splitter contract address (for team and trading rewards)
     * @param _startBlock start block for reward program
     * @param _rewardsPerBlockForStaking array of rewards per block for staking
     * @param _rewardsPerBlockForOthers array of rewards per block for other purposes (team + treasury + trading rewards)
     * @param _periodLengthesInBlocks array of period lengthes
     * @param _numberPeriods number of periods with different rewards/lengthes (e.g., if 3 changes --> 4 periods)
     */
    constructor(
        address _x2y2Token,
        address _tokenSplitter,
        uint256 _startBlock,
        uint256[] memory _rewardsPerBlockForStaking,
        uint256[] memory _rewardsPerBlockForOthers,
        uint256[] memory _periodLengthesInBlocks,
        uint256 _numberPeriods
    ) {
        require(
            (_periodLengthesInBlocks.length == _numberPeriods) &&
                (_rewardsPerBlockForStaking.length == _numberPeriods) &&
                (_rewardsPerBlockForStaking.length == _numberPeriods),
            'Distributor: Lengthes must match numberPeriods'
        );
        // 1. Operational checks for supply
        uint256 nonCirculatingSupply = IMintableERC20(_x2y2Token).SUPPLY_CAP() -
            IMintableERC20(_x2y2Token).totalSupply();
        uint256 amountTokensToBeMinted;
        for (uint256 i = 0; i < _numberPeriods; i++) {
            amountTokensToBeMinted +=
                (_rewardsPerBlockForStaking[i] * _periodLengthesInBlocks[i]) +
                (_rewardsPerBlockForOthers[i] * _periodLengthesInBlocks[i]);
            stakingPeriod[i] = StakingPeriod({
                rewardPerBlockForStaking: _rewardsPerBlockForStaking[i],
                rewardPerBlockForOthers: _rewardsPerBlockForOthers[i],
                periodLengthInBlock: _periodLengthesInBlocks[i]
            });
        }
        require(
            amountTokensToBeMinted == nonCirculatingSupply,
            'Distributor: Wrong reward parameters'
        );
        // 2. Store values
        x2y2Token = IMintableERC20(_x2y2Token);
        tokenSplitter = _tokenSplitter;
        rewardPerBlockForStaking = _rewardsPerBlockForStaking[0];
        rewardPerBlockForOthers = _rewardsPerBlockForOthers[0];
        START_BLOCK = _startBlock;
        endBlock = _startBlock + _periodLengthesInBlocks[0];
        NUMBER_PERIODS = _numberPeriods;
        // Set the lastRewardBlock as the startBlock
        lastRewardBlock = _startBlock;
    }
    /**
     * @notice Deposit staked tokens and compounds pending rewards
     * @param amount amount to deposit (in X2Y2)
     */
    function deposit(uint256 amount) external nonReentrant {
        require(amount > 0, 'Deposit: Amount must be > 0');
        require(block.number >= START_BLOCK, 'Deposit: Not started yet');
        // Update pool information
        _updatePool();
        // Transfer X2Y2 tokens to this contract
        x2y2Token.safeTransferFrom(msg.sender, address(this), amount);
        uint256 pendingRewards;
        // If not new deposit, calculate pending rewards (for auto-compounding)
        if (userInfo[msg.sender].amount > 0) {
            pendingRewards =
                ((userInfo[msg.sender].amount * accTokenPerShare) / PRECISION_FACTOR) -
                userInfo[msg.sender].rewardDebt;
        }
        // Adjust user information
        userInfo[msg.sender].amount += (amount + pendingRewards);
        userInfo[msg.sender].rewardDebt =
            (userInfo[msg.sender].amount * accTokenPerShare) /
            PRECISION_FACTOR;
        // Increase totalAmountStaked
        totalAmountStaked += (amount + pendingRewards);
        emit Deposit(msg.sender, amount, pendingRewards);
    }
    /**
     * @notice Compound based on pending rewards
     */
    function harvestAndCompound() external nonReentrant {
        // Update pool information
        _updatePool();
        // Calculate pending rewards
        uint256 pendingRewards = ((userInfo[msg.sender].amount * accTokenPerShare) /
            PRECISION_FACTOR) - userInfo[msg.sender].rewardDebt;
        // Return if no pending rewards
        if (pendingRewards == 0) {
            // It doesn't throw revertion (to help with the fee-sharing auto-compounding contract)
            return;
        }
        // Adjust user amount for pending rewards
        userInfo[msg.sender].amount += pendingRewards;
        // Adjust totalAmountStaked
        totalAmountStaked += pendingRewards;
        // Recalculate reward debt based on new user amount
        userInfo[msg.sender].rewardDebt =
            (userInfo[msg.sender].amount * accTokenPerShare) /
            PRECISION_FACTOR;
        emit Compound(msg.sender, pendingRewards);
    }
    /**
     * @notice Update pool rewards
     */
    function updatePool() external nonReentrant {
        _updatePool();
    }
    /**
     * @notice Withdraw staked tokens and compound pending rewards
     * @param amount amount to withdraw
     */
    function withdraw(uint256 amount) external nonReentrant {
        require(
            (userInfo[msg.sender].amount >= amount) && (amount > 0),
            'Withdraw: Amount must be > 0 or lower than user balance'
        );
        // Update pool
        _updatePool();
        // Calculate pending rewards
        uint256 pendingRewards = ((userInfo[msg.sender].amount * accTokenPerShare) /
            PRECISION_FACTOR) - userInfo[msg.sender].rewardDebt;
        // Adjust user information
        userInfo[msg.sender].amount = userInfo[msg.sender].amount + pendingRewards - amount;
        userInfo[msg.sender].rewardDebt =
            (userInfo[msg.sender].amount * accTokenPerShare) /
            PRECISION_FACTOR;
        // Adjust total amount staked
        totalAmountStaked = totalAmountStaked + pendingRewards - amount;
        // Transfer X2Y2 tokens to the sender
        x2y2Token.safeTransfer(msg.sender, amount);
        emit Withdraw(msg.sender, amount, pendingRewards);
    }
    /**
     * @notice Withdraw all staked tokens and collect tokens
     */
    function withdrawAll() external nonReentrant {
        require(userInfo[msg.sender].amount > 0, 'Withdraw: Amount must be > 0');
        // Update pool
        _updatePool();
        // Calculate pending rewards and amount to transfer (to the sender)
        uint256 pendingRewards = ((userInfo[msg.sender].amount * accTokenPerShare) /
            PRECISION_FACTOR) - userInfo[msg.sender].rewardDebt;
        uint256 amountToTransfer = userInfo[msg.sender].amount + pendingRewards;
        // Adjust total amount staked
        totalAmountStaked = totalAmountStaked - userInfo[msg.sender].amount;
        // Adjust user information
        userInfo[msg.sender].amount = 0;
        userInfo[msg.sender].rewardDebt = 0;
        // Transfer X2Y2 tokens to the sender
        x2y2Token.safeTransfer(msg.sender, amountToTransfer);
        emit Withdraw(msg.sender, amountToTransfer, pendingRewards);
    }
    /**
     * @notice Calculate pending rewards for a user
     * @param user address of the user
     * @return Pending rewards
     */
    function calculatePendingRewards(address user) external view returns (uint256) {
        if ((block.number > lastRewardBlock) && (totalAmountStaked != 0)) {
            uint256 multiplier = _getMultiplier(lastRewardBlock, block.number);
            uint256 tokenRewardForStaking = multiplier * rewardPerBlockForStaking;
            uint256 adjustedEndBlock = endBlock;
            uint256 adjustedCurrentPhase = currentPhase;
            // Check whether to adjust multipliers and reward per block
            while (
                (block.number > adjustedEndBlock) && (adjustedCurrentPhase < (NUMBER_PERIODS - 1))
            ) {
                // Update current phase
                adjustedCurrentPhase++;
                // Update rewards per block
                uint256 adjustedRewardPerBlockForStaking = stakingPeriod[adjustedCurrentPhase]
                    .rewardPerBlockForStaking;
                // Calculate adjusted block number
                uint256 previousEndBlock = adjustedEndBlock;
                // Update end block
                adjustedEndBlock =
                    previousEndBlock +
                    stakingPeriod[adjustedCurrentPhase].periodLengthInBlock;
                // Calculate new multiplier
                uint256 newMultiplier = (block.number <= adjustedEndBlock)
                    ? (block.number - previousEndBlock)
                    : stakingPeriod[adjustedCurrentPhase].periodLengthInBlock;
                // Adjust token rewards for staking
                tokenRewardForStaking += (newMultiplier * adjustedRewardPerBlockForStaking);
            }
            uint256 adjustedTokenPerShare = accTokenPerShare +
                (tokenRewardForStaking * PRECISION_FACTOR) /
                totalAmountStaked;
            return
                (userInfo[user].amount * adjustedTokenPerShare) /
                PRECISION_FACTOR -
                userInfo[user].rewardDebt;
        } else {
            return
                (userInfo[user].amount * accTokenPerShare) /
                PRECISION_FACTOR -
                userInfo[user].rewardDebt;
        }
    }
    /**
     * @notice Update reward variables of the pool
     */
    function _updatePool() internal {
        if (block.number <= lastRewardBlock) {
            return;
        }
        if (totalAmountStaked == 0) {
            lastRewardBlock = block.number;
            return;
        }
        // Calculate multiplier
        uint256 multiplier = _getMultiplier(lastRewardBlock, block.number);
        // Calculate rewards for staking and others
        uint256 tokenRewardForStaking = multiplier * rewardPerBlockForStaking;
        uint256 tokenRewardForOthers = multiplier * rewardPerBlockForOthers;
        // Check whether to adjust multipliers and reward per block
        while ((block.number > endBlock) && (currentPhase < (NUMBER_PERIODS - 1))) {
            // Update rewards per block
            _updateRewardsPerBlock(endBlock);
            uint256 previousEndBlock = endBlock;
            // Adjust the end block
            endBlock += stakingPeriod[currentPhase].periodLengthInBlock;
            // Adjust multiplier to cover the missing periods with other lower inflation schedule
            uint256 newMultiplier = _getMultiplier(previousEndBlock, block.number);
            // Adjust token rewards
            tokenRewardForStaking += (newMultiplier * rewardPerBlockForStaking);
            tokenRewardForOthers += (newMultiplier * rewardPerBlockForOthers);
        }
        // Mint tokens only if token rewards for staking are not null
        if (tokenRewardForStaking > 0) {
            // It allows protection against potential issues to prevent funds from being locked
            bool mintStatus = x2y2Token.mint(address(this), tokenRewardForStaking);
            if (mintStatus) {
                accTokenPerShare =
                    accTokenPerShare +
                    ((tokenRewardForStaking * PRECISION_FACTOR) / totalAmountStaked);
            }
            x2y2Token.mint(tokenSplitter, tokenRewardForOthers);
        }
        // Update last reward block only if it wasn't updated after or at the end block
        if (lastRewardBlock <= endBlock) {
            lastRewardBlock = block.number;
        }
    }
    /**
     * @notice Update rewards per block
     * @dev Rewards are halved by 2 (for staking + others)
     */
    function _updateRewardsPerBlock(uint256 _newStartBlock) internal {
        // Update current phase
        currentPhase++;
        // Update rewards per block
        rewardPerBlockForStaking = stakingPeriod[currentPhase].rewardPerBlockForStaking;
        rewardPerBlockForOthers = stakingPeriod[currentPhase].rewardPerBlockForOthers;
        emit NewRewardsPerBlock(
            currentPhase,
            _newStartBlock,
            rewardPerBlockForStaking,
            rewardPerBlockForOthers
        );
    }
    /**
     * @notice Return reward multiplier over the given "from" to "to" block.
     * @param from block to start calculating reward
     * @param to block to finish calculating reward
     * @return the multiplier for the period
     */
    function _getMultiplier(uint256 from, uint256 to) internal view returns (uint256) {
        if (to <= endBlock) {
            return to - from;
        } else if (from >= endBlock) {
            return 0;
        } else {
            return endBlock - from;
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IRewardConvertor {
    function convert(
        address tokenToSell,
        address tokenToBuy,
        uint256 amount,
        bytes calldata additionalData
    ) external returns (uint256);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import {IERC20} from '@openzeppelin/contracts/token/ERC20/IERC20.sol';
interface IMintableERC20 is IERC20 {
    function SUPPLY_CAP() external view returns (uint256);
    function mint(address account, uint256 amount) external returns (bool);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface ITokenStaked {
    function getTotalStaked() external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)
pragma solidity ^0.8.0;
/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IStakeFor {
    function depositFor(address user, uint256 amount) external returns (bool);
}