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// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.16;
pragma abicoder v2;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";

import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/cryptography/ECDSAUpgradeable.sol";

import "../interfaces/IDavosBridge.sol";

import "../libraries/EthereumVerifier.sol";
import "../libraries/ProofParser.sol";
import "../libraries/Utils.sol";

contract DavosBridge is IDavosBridge, OwnableUpgradeable, PausableUpgradeable, ReentrancyGuardUpgradeable {

    // --- Vars ---
    uint256 private _globalNonce;
    address private _consensusAddress;
    Metadata private _nativeTokenMetadata;

    mapping(bytes32 => bool) private _usedProofs;
    mapping(uint256 => address) private _bridgeAddressByChainId;
    mapping(bytes32 => address) private _warpDestinations;  // KECCAK256(fromToken,fromChain,_bridgeAddressByChainId(toChain), toChain) => destinationToken

    uint256 public shortCapDuration;  // [sec]
    mapping(address => uint256) public shortCaps;  // Token => Cap per 'shortCapTime'
    mapping(address => mapping(uint256 => uint256)) public shortCapsDeposit;   // Token => (EpochTime/shortCapDuration) => Current Deposits
    mapping(address => mapping(uint256 => uint256)) public shortCapsWithdraw;  // Token => (EpochTime/shortCapDuration) => Current Withdraws

    uint256 public longCapDuration;  // [sec]
    mapping(address => uint256) public longCaps;  // Token => Cap per 'longCapTime'
    mapping(address => mapping(uint256 => uint256)) public longCapsDeposit;   // Token => (EpochTime/longCapDuration) => Current Deposits
    mapping(address => mapping(uint256 => uint256)) public longCapsWithdraw;  // Token => (EpochTime/longCapDuration) => Current Withdraws

    /// @custom:oz-upgrades-unsafe-allow constructor
    // --- Constructor ---
    constructor() { _disableInitializers(); }

    // --- Init ---
    function initialize(address consensusAddress, string memory nativeTokenSymbol, string memory nativeTokenName) external initializer {

        __Ownable_init();
        __Pausable_init();
        __ReentrancyGuard_init();

        _consensusAddress = consensusAddress;
        _nativeTokenMetadata = Metadata(
            Utils.stringToBytes32(nativeTokenSymbol),
            Utils.stringToBytes32(nativeTokenName),
            block.chainid,
            address(bytes20(keccak256(abi.encodePacked("DavosBridge", nativeTokenSymbol))))     
        );

        shortCapDuration = 1 hours;
        longCapDuration = 1 days;
    }

    // --- User ---
    function depositToken(address fromToken, uint256 toChain, address toAddress, uint256 amount) external override nonReentrant whenNotPaused {
        
        _updateDepositCaps(fromToken, amount);

        if (warpDestination(fromToken, toChain) != address(0)) {
            _depositWarped(fromToken, toChain, toAddress, amount);
        } else revert("DavosBridge/warp-destination-unknown");
    }
    function _updateDepositCaps(address fromToken, uint256 amount) internal {

        require(shortCapsDeposit[fromToken][getCurrentStamp(shortCapDuration)] + amount <= shortCaps[fromToken], "DavosBridge/short-caps-exceeded");
        shortCapsDeposit[fromToken][getCurrentStamp(shortCapDuration)] += amount;

        require(longCapsDeposit[fromToken][getCurrentStamp(longCapDuration)] + amount <= longCaps[fromToken], "DavosBridge/long-caps-exceeded");
        longCapsDeposit[fromToken][getCurrentStamp(longCapDuration)] += amount;
    }
    /**
     * @dev Tokens on source and destination chains are linked with independent supplies.
     * Burns tokens on source chain (to later mint on destination chain).
     * @param fromToken one of many warp-able token on source chain.
     * @param toChain one of many destination chain ID.
     * @param toAddress claimer of 'totalAmount' on destination chain.
     * @param totalAmount amout of tokens to be warped.
     */
    function _depositWarped(address fromToken, uint256 toChain, address toAddress, uint256 totalAmount) internal {

        require(_bridgeAddressByChainId[toChain] != address(0), "DavosBridge/non-existing-bridge");
        address fromAddress = address(msg.sender);
        
        uint256 balanceBefore = IERC20Upgradeable(fromToken).balanceOf(fromAddress);
        IERC20Mintable(fromToken).burn(fromAddress, totalAmount); 
        uint256 balanceAfter = IERC20Upgradeable(fromToken).balanceOf(fromAddress);
        require(balanceAfter + totalAmount == balanceBefore, "DavosBridge/incorrect-transfer-amount");

        /* fromToken and toToken are independent, originChain and originAddress are invalid */
        Metadata memory metaData = Metadata(
            Utils.stringToBytes32(IERC20Extra(fromToken).symbol()),
            Utils.stringToBytes32(IERC20Extra(fromToken).name()),
            0,
            address(0)
        );

       _globalNonce++;

        emit DepositWarped(toChain, fromAddress, toAddress, fromToken, warpDestination(fromToken, toChain), _amountErc20Token(fromToken, totalAmount), _globalNonce, metaData);
    }
    function _amountErc20Token(address fromToken, uint256 totalAmount) internal returns (uint256) {

        /* scale amount to 18 decimals */
        require(IERC20Extra(fromToken).decimals() <= 18, "DavosBridge/decimals-overflow");
        totalAmount *= (10**(18 - IERC20Extra(fromToken).decimals()));
        return totalAmount;
    }
    function withdraw(bytes calldata, /* encodedProof */ bytes calldata rawReceipt, bytes memory proofSignature) external override nonReentrant whenNotPaused {

        uint256 proofOffset;
        uint256 receiptOffset;
        assembly {
            proofOffset := add(0x4, calldataload(4))
            receiptOffset := add(0x4, calldataload(36))
        }
        /* we must parse and verify that tx and receipt matches */
        (EthereumVerifier.State memory state, EthereumVerifier.PegInType pegInType) = EthereumVerifier.parseTransactionReceipt(receiptOffset);

        require(state.chainId == block.chainid, "DavosBridge/receipt-points-to-another-chain");

        ProofParser.Proof memory proof = ProofParser.parseProof(proofOffset);
        require(state.contractAddress != address(0), "DavosBridge/invalid-contractAddress");
        require(_bridgeAddressByChainId[proof.chainId] == state.contractAddress, "DavosBridge/event-from-unknown-bridge");

        state.receiptHash = keccak256(rawReceipt);
        proof.status = 0x01;
        proof.receiptHash = state.receiptHash;

        bytes32 proofHash;
        assembly {
            proofHash := keccak256(proof, 0x100)
        }

        // we can trust receipt only if proof is signed by consensus
        require(ECDSAUpgradeable.recover(proofHash, proofSignature) == _consensusAddress, "DavosBridge/bad-signature");

        // withdraw funds to recipient
        _withdraw(state, pegInType, proof, proofHash);
    }
    function _withdraw(EthereumVerifier.State memory state, EthereumVerifier.PegInType pegInType, ProofParser.Proof memory proof, bytes32 payload) internal {

        require(!_usedProofs[payload], "DavosBridge/used-proof");
        _usedProofs[payload] = true;
        if (pegInType == EthereumVerifier.PegInType.Warp) {
            _withdrawWarped(state, proof);
        } else revert("DavosBridge/invalid-type");
    }
    function _withdrawWarped(EthereumVerifier.State memory state, ProofParser.Proof memory proof) internal {

        require(state.fromToken != address(0), "DavosBridge/invalid-fromToken");
        require(warpDestination(state.toToken, proof.chainId) == state.fromToken, "DavosBridge/bridge-from-unknown-destination");

        uint8 decimals = IERC20MetadataUpgradeable(state.toToken).decimals();
        require(decimals <= 18, "DavosBridge/decimals-overflow");

        uint256 scaledAmount = state.totalAmount / (10**(18 - decimals));

        _updateWithdrawCaps(state.toToken, scaledAmount);

        IERC20Mintable(state.toToken).mint(state.toAddress, scaledAmount);

        emit WithdrawMinted(state.receiptHash, state.fromAddress, state.toAddress, state.fromToken, state.toToken, state.totalAmount);
    }
    function _updateWithdrawCaps(address token, uint256 amount) internal {

        require(shortCapsWithdraw[token][getCurrentStamp(shortCapDuration)] + amount <= shortCaps[token], "DavosBridge/short-caps-exceeded");
        shortCapsWithdraw[token][getCurrentStamp(shortCapDuration)] += amount;

        require(longCapsWithdraw[token][getCurrentStamp(longCapDuration)] + amount <= longCaps[token], "DavosBridge/long-caps-exceeded");
        longCapsWithdraw[token][getCurrentStamp(longCapDuration)] += amount;
    }

    // --- Admin ---
    function pause() public onlyOwner {

        _pause();
    }
    function unpause() public onlyOwner {

        _unpause();
    }
    function addBridge(address bridge, uint256 toChain) public onlyOwner {

        require(_bridgeAddressByChainId[toChain] == address(0x00), "DavosBridge/already-allowed");
        require(toChain > 0, "DavosBridge/invalid-chain");
        _bridgeAddressByChainId[toChain] = bridge;

        emit BridgeAdded(bridge, toChain);
    }
    function removeBridge(uint256 toChain) public onlyOwner {

        require(_bridgeAddressByChainId[toChain] != address(0x00), "already-removed");
        require(toChain > 0, "DavosBridge/invalid-chain");
        address bridge = _bridgeAddressByChainId[toChain];
        delete _bridgeAddressByChainId[toChain];

        emit BridgeRemoved(bridge, toChain);
    }
    function addWarpDestination(address fromToken, uint256 toChain, address toToken) external onlyOwner {

        require(_bridgeAddressByChainId[toChain] != address(0), "DavosBridge/bad-chain");
        bytes32 direction = keccak256(abi.encodePacked(fromToken, block.chainid, _bridgeAddressByChainId[toChain], toChain));
        require(_warpDestinations[direction] == address(0), "DavosBridge/known-destination");
        _warpDestinations[direction] = toToken;

        emit WarpDestinationAdded(fromToken, toChain, toToken);
    }
    function removeWarpDestination(address fromToken, uint256 toChain, address toToken) external onlyOwner {

        require(_bridgeAddressByChainId[toChain] != address(0), "DavosBridge/bad-chain");
        bytes32 direction = keccak256(abi.encodePacked(fromToken, block.chainid, _bridgeAddressByChainId[toChain], toChain));
        require(_warpDestinations[direction] != address(0), "DavosBridge/unknown-destination");
        delete _warpDestinations[direction];

        emit WarpDestinationRemoved(fromToken, toChain, toToken);
    }
    function changeConsensus(address consensus) public onlyOwner {

        require(consensus != address(0x0), "DavosBridge/invalid-address");
        _consensusAddress = consensus;

        emit ConsensusChanged(_consensusAddress);
    }
    function changeMetadata(address token, bytes32 name, bytes32 symbol) external onlyOwner {
        
        IERC20MetadataChangeable(token).changeName(name);
        IERC20MetadataChangeable(token).changeSymbol(symbol);
    }
    function changeShortCap(address token, uint256 amount) external onlyOwner {

        uint256 xAmount = shortCaps[token];
        shortCaps[token] = amount;

        emit ShortCapChanged(token, xAmount, amount);
    }
    function changeShortCapDuration(uint256 duration) external onlyOwner {

        uint256 xDuration = shortCapDuration;
        shortCapDuration = duration;

        emit ShortCapDurationChanged(xDuration, duration);
    }
    function changeLongCap(address token, uint256 amount) external onlyOwner {

        uint256 xAmount = longCaps[token];
        longCaps[token] = amount;

        emit LongCapChanged(token, xAmount, amount);
    }
    function changeLongCapDuration(uint256 duration) external onlyOwner {

        uint256 xDuration = longCapDuration;
        longCapDuration = duration;

        emit LongCapDurationChanged(xDuration, duration);
    }

    // --- Views ---
    function warpDestination(address fromToken, uint256 toChain) public view returns(address) {

        return _warpDestinations[keccak256(abi.encodePacked(fromToken, block.chainid, _bridgeAddressByChainId[toChain], toChain))];
    }
    function getCurrentStamp(uint256 duration) public view returns(uint256) {

        return (block.timestamp / duration) * duration;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

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 proxied contracts do not make use of 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.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * 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 prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        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());
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-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;
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 {
    }

    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;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../StringsUpgradeable.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 ECDSAUpgradeable {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }

    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");
        }
    }

    /**
     * @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) {
        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.
            /// @solidity memory-safe-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 {
            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 = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 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 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:\n32", 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:\n", StringsUpgradeable.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 (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library MathUpgradeable {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/MathUpgradeable.sol";

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = MathUpgradeable.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, MathUpgradeable.log256(value) + 1);
        }
    }

    /**
     * @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] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// // SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.16;

import "./IERC20.sol";

interface IDavosBridge {

    // --- Structs ---
    struct Metadata {
        bytes32 symbol;
        bytes32 name;
        uint256 originChain;
        address originAddress;
    }

    // --- Events ---
    event ShortCapChanged(address indexed token, uint256 indexed xAmount, uint256 indexed amount);
    event LongCapChanged(address indexed token,uint256 indexed xAmount, uint256 indexed amount);
    event ShortCapDurationChanged(uint256 indexed xDuration, uint256 indexed duration);
    event LongCapDurationChanged(uint256 indexed xDuration, uint256 indexed duration);
    event BridgeAdded(address bridge, uint256 toChain);
    event BridgeRemoved(address bridge, uint256 toChain);
    event WarpDestinationAdded(address indexed fromToken, uint256 indexed toChain, address indexed toToken);
    event WarpDestinationRemoved(address indexed fromToken, uint256 indexed toChain, address indexed toToken);
    event ConsensusChanged(address consensusAddress);
    event DepositWarped(uint256 chainId, address indexed fromAddress, address indexed toAddress, address fromToken, address toToken, uint256 totalAmount, uint256 nonce, Metadata metadata);
    event WithdrawMinted(bytes32 receiptHash, address indexed fromAddress, address indexed toAddress, address fromToken, address toToken, uint256 totalAmount);

    // --- Functions ---
    function depositToken(address fromToken, uint256 toChain, address toAddress, uint256 amount) external;
    function withdraw(bytes calldata encodedProof, bytes calldata rawReceipt, bytes memory receiptRootSignature) external;
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.16;

interface IERC20Mintable {
    function mint(address account, uint256 amount) external;

    function burn(address account, uint256 amount) external;

    // use for charge bridge commission before burn
    function chargeFrom(address sender, address recipient, uint256 amount) external returns (bool);
}

interface IERC20Pegged {
    function getOrigin() external view returns (uint256, address);
}

interface IERC20Extra {
    function name() external returns (string memory);

    function decimals() external returns (uint8);

    function symbol() external returns (string memory);
}

interface IERC20MetadataChangeable {
    event NameChanged(string prevValue, string newValue);

    event SymbolChanged(string prevValue, string newValue);

    function changeName(bytes32) external;

    function changeSymbol(bytes32) external;
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.16;

library CallDataRLPReader {
    uint8 constant STRING_SHORT_START = 0x80;
    uint8 constant STRING_LONG_START = 0xb8;
    uint8 constant LIST_SHORT_START = 0xc0;
    uint8 constant LIST_LONG_START = 0xf8;
    uint8 constant WORD_SIZE = 32;

    function beginIteration(uint256 listOffset)
        internal
        pure
        returns (uint256 iter)
    {
        return listOffset + _payloadOffset(listOffset);
    }

    function next(uint256 iter) internal pure returns (uint256 nextIter) {
        return iter + itemLength(iter);
    }

    function payloadLen(uint256 ptr, uint256 len)
        internal
        pure
        returns (uint256)
    {
        return len - _payloadOffset(ptr);
    }

    function toAddress(uint256 ptr) internal pure returns (address) {
        return address(uint160(toUint(ptr, 21)));
    }

    function toUint(uint256 ptr, uint256 len) internal pure returns (uint256) {
        require(len > 0 && len <= 33);
        uint256 offset = _payloadOffset(ptr);
        uint256 numLen = len - offset;

        uint256 result;
        assembly {
            result := calldataload(add(ptr, offset))
            // cut off redundant bytes
            result := shr(mul(8, sub(32, numLen)), result)
        }
        return result;
    }

    function toUintStrict(uint256 ptr) internal pure returns (uint256) {
        // one byte prefix
        uint256 result;
        assembly {
            result := calldataload(add(ptr, 1))
        }
        return result;
    }

    function rawDataPtr(uint256 ptr) internal pure returns (uint256) {
        return ptr + _payloadOffset(ptr);
    }

    // @return entire rlp item byte length
    function itemLength(uint256 callDataPtr) internal pure returns (uint256) {
        uint256 itemLen;
        uint256 byte0;
        assembly {
            byte0 := byte(0, calldataload(callDataPtr))
        }

        if (byte0 < STRING_SHORT_START) itemLen = 1;
        else if (byte0 < STRING_LONG_START)
            itemLen = byte0 - STRING_SHORT_START + 1;
        else if (byte0 < LIST_SHORT_START) {
            assembly {
                let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is
                callDataPtr := add(callDataPtr, 1) // skip over the first byte

                /* 32 byte word size */
                let dataLen := shr(
                    mul(8, sub(32, byteLen)),
                    calldataload(callDataPtr)
                )
                itemLen := add(dataLen, add(byteLen, 1))
            }
        } else if (byte0 < LIST_LONG_START) {
            itemLen = byte0 - LIST_SHORT_START + 1;
        } else {
            assembly {
                let byteLen := sub(byte0, 0xf7)
                callDataPtr := add(callDataPtr, 1)

                let dataLen := shr(
                    mul(8, sub(32, byteLen)),
                    calldataload(callDataPtr)
                )
                itemLen := add(dataLen, add(byteLen, 1))
            }
        }

        return itemLen;
    }

    // @return number of bytes until the data
    function _payloadOffset(uint256 callDataPtr)
        private
        pure
        returns (uint256)
    {
        uint256 byte0;
        assembly {
            byte0 := byte(0, calldataload(callDataPtr))
        }

        if (byte0 < STRING_SHORT_START) return 0;
        else if (
            byte0 < STRING_LONG_START ||
            (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START)
        ) return 1;
        else if (byte0 < LIST_SHORT_START)
            return byte0 - (STRING_LONG_START - 1) + 1;
        else return byte0 - (LIST_LONG_START - 1) + 1;
    }
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.16;

import "./CallDataRLPReader.sol";
import "./Utils.sol";
import "../interfaces/IDavosBridge.sol";

library EthereumVerifier {
    
    bytes32 constant TOPIC_PEG_IN_WARPED = keccak256("DepositWarped(uint256,address,address,address,address,uint256,uint256,(bytes32,bytes32,uint256,address))");

    enum PegInType {
        None,
        Warp
    }

    struct State {
        bytes32 receiptHash;
        address contractAddress;
        uint256 chainId;
        address fromAddress;
        address toAddress;
        address fromToken;
        address toToken;
        uint256 totalAmount;
        uint256 nonce;
        // metadata fields (we can't use Metadata struct here because of Solidity struct memory layout)
        bytes32 symbol;
        bytes32 name;
        uint256 originChain;
        address originToken;
    }

    function getMetadata(State memory state)
        internal
        pure
        returns (IDavosBridge.Metadata memory)
    {
        IDavosBridge.Metadata memory metadata;
        assembly {
            metadata := add(state, 0x120)
        }
        return metadata;
    }

    function parseTransactionReceipt(uint256 receiptOffset)
        internal
        pure
        returns (State memory state, PegInType pegInType)
    {
        /* parse peg-in data from logs */
        uint256 iter = CallDataRLPReader.beginIteration(receiptOffset + 0x20);
        {
            /* postStateOrStatus - we must ensure that tx is not reverted */
            uint256 statusOffset = iter;
            iter = CallDataRLPReader.next(iter);
            require(
                CallDataRLPReader.payloadLen(
                    statusOffset,
                    iter - statusOffset
                ) == 1,
                "EthereumVerifier: tx is reverted"
            );
        }
        /* skip cumulativeGasUsed */
        iter = CallDataRLPReader.next(iter);
        /* logs - we need to find our logs */
        uint256 logs = iter;
        iter = CallDataRLPReader.next(iter);
        uint256 logsIter = CallDataRLPReader.beginIteration(logs);
        for (; logsIter < iter; ) {
            uint256 log = logsIter;
            logsIter = CallDataRLPReader.next(logsIter);
            /* make sure there is only one peg-in event in logs */
            PegInType logType = _decodeReceiptLogs(state, log);
            if (logType != PegInType.None) {
                require(
                    pegInType == PegInType.None,
                    "EthereumVerifier: multiple logs"
                );
                pegInType = logType;
            }
        }
        /* don't allow to process if peg-in type is unknown */
        require(pegInType != PegInType.None, "EthereumVerifier: missing logs");
        return (state, pegInType);
    }

    function _decodeReceiptLogs(State memory state, uint256 log)
        internal
        pure
        returns (PegInType pegInType)
    {
        uint256 logIter = CallDataRLPReader.beginIteration(log);
        address contractAddress;
        {
            /* parse smart contract address */
            uint256 addressOffset = logIter;
            logIter = CallDataRLPReader.next(logIter);
            contractAddress = CallDataRLPReader.toAddress(addressOffset);
        }
        /* topics */
        bytes32 mainTopic;
        address fromAddress;
        address toAddress;
        {
            uint256 topicsIter = logIter;
            logIter = CallDataRLPReader.next(logIter);
            // Must be 3 topics RLP encoded: event signature, fromAddress, toAddress
            // Each topic RLP encoded is 33 bytes (0xa0[32 bytes data])
            // Total payload: 99 bytes. Since it's list with total size bigger than 55 bytes we need 2 bytes prefix (0xf863)
            // So total size of RLP encoded topics array must be 101
            if (CallDataRLPReader.itemLength(topicsIter) != 101) {
                return PegInType.None;
            }
            topicsIter = CallDataRLPReader.beginIteration(topicsIter);
            mainTopic = bytes32(CallDataRLPReader.toUintStrict(topicsIter));
            topicsIter = CallDataRLPReader.next(topicsIter);
            fromAddress = address(
                bytes20(uint160(CallDataRLPReader.toUintStrict(topicsIter)))
            );
            topicsIter = CallDataRLPReader.next(topicsIter);
            toAddress = address(
                bytes20(uint160(CallDataRLPReader.toUintStrict(topicsIter)))
            );
            topicsIter = CallDataRLPReader.next(topicsIter);
            require(topicsIter == logIter); // safety check that iteration is finished
        }

        uint256 ptr = CallDataRLPReader.rawDataPtr(logIter);
        logIter = CallDataRLPReader.next(logIter);
        uint256 len = logIter - ptr;
        {
            // parse logs based on topic type and check that event data has correct length
            uint256 expectedLen;
            if (mainTopic == TOPIC_PEG_IN_WARPED) {
                expectedLen = 0x120;
                pegInType = PegInType.Warp;
            } else {
                return PegInType.None;
            }
            if (len != expectedLen) {
                return PegInType.None;
            }
        }
        {
            // read chain id separately and verify that contract that emitted event is relevant
            uint256 chainId;
            assembly {
                chainId := calldataload(ptr)
            }
            //  if (chainId != Utils.currentChain()) return PegInType.None;
            // All checks are passed after this point, no errors allowed and we can modify state
            state.chainId = chainId;
            ptr += 0x20;
            len -= 0x20;
        }

        {
            uint256 structOffset;
            assembly {
                // skip 5 fields: receiptHash, contractAddress, chainId, fromAddress, toAddress
                structOffset := add(state, 0xa0)
                calldatacopy(structOffset, ptr, len)
            }
        }
        state.contractAddress = contractAddress;
        state.fromAddress = fromAddress;
        state.toAddress = toAddress;
        return pegInType;
    }
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.6;

import "./CallDataRLPReader.sol";
import "./Utils.sol";

library ProofParser {
    // Proof is message format signed by the protocol. It contains somewhat redundant information, so only part
    // of the proof could be passed into the contract and other part can be inferred from transaction receipt
    struct Proof {
        uint256 chainId;
        uint256 status;
        bytes32 transactionHash;
        uint256 blockNumber;
        bytes32 blockHash;
        uint256 transactionIndex;
        bytes32 receiptHash;
        uint256 transferAmount;
    }

    function parseProof(uint256 proofOffset)
        internal
        pure
        returns (Proof memory)
    {
        Proof memory proof;
        uint256 dataOffset = proofOffset + 0x20;
        assembly {
            calldatacopy(proof, dataOffset, 0x20) // 1 field (chainId)
            dataOffset := add(dataOffset, 0x40)
            calldatacopy(add(proof, 0x40), dataOffset, 0x80) // 4 fields * 0x20 = 0x80
            dataOffset := add(dataOffset, 0xa0)
            calldatacopy(add(proof, 0xe0), dataOffset, 0x20) // transferAmount
        }
        return proof;
    }
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.16;

library Utils {
    function currentChain() internal view returns (uint256) {
        uint256 chain;
        assembly {
            chain := chainid()
        }
        return chain;
    }

    function stringToBytes32(string memory source)
        internal
        pure
        returns (bytes32 result)
    {
        bytes memory tempEmptyStringTest = bytes(source);
        if (tempEmptyStringTest.length == 0) {
            return 0x0;
        }
        assembly {
            result := mload(add(source, 32))
        }
    }

    function saturatingMultiply(uint256 a, uint256 b)
        internal
        pure
        returns (uint256)
    {
        unchecked {
            if (a == 0) return 0;
            uint256 c = a * b;
            if (c / a != b) return type(uint256).max;
            return c;
        }
    }

    function saturatingAdd(uint256 a, uint256 b)
        internal
        pure
        returns (uint256)
    {
        unchecked {
            uint256 c = a + b;
            if (c < a) return type(uint256).max;
            return c;
        }
    }

    // Preconditions:
    //  1. a may be arbitrary (up to 2 ** 256 - 1)
    //  2. b * c < 2 ** 256
    // Returned value: min(floor((a * b) / c), 2 ** 256 - 1)
    function multiplyAndDivideFloor(
        uint256 a,
        uint256 b,
        uint256 c
    ) internal pure returns (uint256) {
        return
            saturatingAdd(
                saturatingMultiply(a / c, b),
                ((a % c) * b) / c // can't fail because of assumption 2.
            );
    }

    // Preconditions:
    //  1. a may be arbitrary (up to 2 ** 256 - 1)
    //  2. b * c < 2 ** 256
    // Returned value: min(ceil((a * b) / c), 2 ** 256 - 1)
    function multiplyAndDivideCeil(
        uint256 a,
        uint256 b,
        uint256 c
    ) internal pure returns (uint256) {
        return
            saturatingAdd(
                saturatingMultiply(a / c, b),
                ((a % c) * b + (c - 1)) / c // can't fail because of assumption 2.
            );
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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