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// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.16;

import './library/UtilLib.sol';

import './ETHx.sol';
import './interfaces/IPoolUtils.sol';
import './interfaces/IPoolSelector.sol';
import './interfaces/IStaderConfig.sol';
import './interfaces/IStaderOracle.sol';
import './interfaces/IStaderPoolBase.sol';
import './interfaces/IUserWithdrawalManager.sol';
import './interfaces/IStaderStakePoolManager.sol';

import '@openzeppelin/contracts/utils/math/Math.sol';
import '@openzeppelin/contracts/utils/math/SafeMath.sol';
import '@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol';

/**
 *  @title Liquid Staking Pool Implementation
 *  Stader is a non-custodial smart contract-based staking platform
 *  that helps you conveniently discover and access staking solutions.
 *  We are building key staking middleware infra for multiple PoS networks
 * for retail crypto users, exchanges and custodians.
 */
contract StaderStakePoolsManager is
    IStaderStakePoolManager,
    AccessControlUpgradeable,
    PausableUpgradeable,
    ReentrancyGuardUpgradeable
{
    using Math for uint256;
    using SafeMath for uint256;
    IStaderConfig public staderConfig;
    uint256 public lastExcessETHDepositBlock;
    uint256 public excessETHDepositCoolDown;

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

    /**
     * @dev Stader initialized with following variables
     * @param _staderConfig config contract
     */
    function initialize(address _admin, address _staderConfig) external initializer {
        UtilLib.checkNonZeroAddress(_admin);
        UtilLib.checkNonZeroAddress(_staderConfig);
        __AccessControl_init();
        __Pausable_init();
        __ReentrancyGuard_init();
        lastExcessETHDepositBlock = block.number;
        excessETHDepositCoolDown = 3 * 7200;
        staderConfig = IStaderConfig(_staderConfig);
        _grantRole(DEFAULT_ADMIN_ROLE, _admin);
    }

    // protection against accidental submissions by calling non-existent function
    fallback() external payable {
        revert UnsupportedOperation();
    }

    // protection against accidental submissions by calling non-existent function
    receive() external payable {
        revert UnsupportedOperation();
    }

    // payable function for receiving execution layer rewards.
    function receiveExecutionLayerRewards() external payable override {
        emit ExecutionLayerRewardsReceived(msg.value);
    }

    // payable function for receiving user share from validator withdraw vault
    function receiveWithdrawVaultUserShare() external payable override {
        emit WithdrawVaultUserShareReceived(msg.value);
    }

    function receiveEthFromAuction() external payable override {
        emit AuctionedEthReceived(msg.value);
    }

    /**
     * @notice receive the excess ETH from Pools
     * @param _poolId ID of the pool
     */
    function receiveExcessEthFromPool(uint8 _poolId) external payable override {
        emit ReceivedExcessEthFromPool(_poolId);
    }

    /**
     * @notice transfer the ETH to user withdraw manager to finalize requests
     * @dev only user withdraw manager allowed to call
     * @param _amount amount of ETH to transfer
     */
    function transferETHToUserWithdrawManager(uint256 _amount) external override nonReentrant whenNotPaused {
        UtilLib.onlyStaderContract(msg.sender, staderConfig, staderConfig.USER_WITHDRAW_MANAGER());
        //slither-disable-next-line arbitrary-send-eth
        (bool success, ) = payable(staderConfig.getUserWithdrawManager()).call{value: _amount}('');
        if (!success) {
            revert TransferFailed();
        }
        emit TransferredETHToUserWithdrawManager(_amount);
    }

    function updateExcessETHDepositCoolDown(uint256 _excessETHDepositCoolDown) external {
        UtilLib.onlyManagerRole(msg.sender, staderConfig);
        excessETHDepositCoolDown = _excessETHDepositCoolDown;
        emit UpdatedExcessETHDepositCoolDown(_excessETHDepositCoolDown);
    }

    //update the address of staderConfig
    function updateStaderConfig(address _staderConfig) external onlyRole(DEFAULT_ADMIN_ROLE) {
        UtilLib.checkNonZeroAddress(_staderConfig);
        staderConfig = IStaderConfig(_staderConfig);
        emit UpdatedStaderConfig(_staderConfig);
    }

    /**
     * @notice returns the amount of ETH equivalent 1 ETHX (with 18 decimals)
     */
    function getExchangeRate() external view override returns (uint256) {
        return
            UtilLib.computeExchangeRate(
                totalAssets(),
                IStaderOracle(staderConfig.getStaderOracle()).getExchangeRate().totalETHXSupply,
                staderConfig
            );
    }

    // returns total ETH balance of protocol
    function totalAssets() public view override returns (uint256) {
        return IStaderOracle(staderConfig.getStaderOracle()).getExchangeRate().totalETHBalance;
    }

    // return the amount of share corresponding to `_assets` assets
    function convertToShares(uint256 _assets) external view override returns (uint256) {
        return _convertToShares(_assets, Math.Rounding.Down);
    }

    // return the amount of assets corresponding to `_shares` shares
    function convertToAssets(uint256 _shares) external view override returns (uint256) {
        return _convertToAssets(_shares, Math.Rounding.Down);
    }

    // returns the amount of max deposit limit based on vault health
    function maxDeposit() public view override returns (uint256) {
        return isVaultHealthy() ? staderConfig.getMaxDepositAmount() : 0;
    }

    function minDeposit() public view override returns (uint256) {
        return isVaultHealthy() ? staderConfig.getMinDepositAmount() : 0;
    }

    // returns the amount of share corresponding to `_assets` assets
    function previewDeposit(uint256 _assets) public view override returns (uint256) {
        return _convertToShares(_assets, Math.Rounding.Down);
    }

    // return the amount of assets corresponding to `_shares` shares
    function previewWithdraw(uint256 _shares) external view override returns (uint256) {
        return _convertToAssets(_shares, Math.Rounding.Down);
    }

    /**
     * @notice auxiliary method for KOL users/referrals to stake ETH and mint ETHx for _receiver based on exchange rate
     * @param _receiver account where ETHx minted are sent
     * @param _referralId referral id of KOL
     * @return _shares amount of ETHx token minted and sent to receiver
     * @dev emits an event with _referralId
     */
    function deposit(address _receiver, string calldata _referralId)
        external
        payable
        override
        whenNotPaused
        returns (uint256 _shares)
    {
        _shares = deposit(_receiver);
        emit DepositReferral(msg.sender, _receiver, msg.value, _shares, _referralId);
    }

    /**
     * @notice stake ETH and mint ETHx for _receiver based on exchange rate
     * @param _receiver account where ETHx
     * @return shares amount of ETHx token minted and sent to receiver
     */
    function deposit(address _receiver) public payable override whenNotPaused returns (uint256) {
        uint256 assets = msg.value;
        if (assets > maxDeposit() || assets < minDeposit()) {
            revert InvalidDepositAmount();
        }
        uint256 shares = previewDeposit(assets);
        _deposit(msg.sender, _receiver, assets, shares);
        return shares;
    }

    /**
     * @notice spinning off validators in pool `_poolId`
     * @dev gets the count of validator to deposit for pool from pool selector logic
     */
    function validatorBatchDeposit(uint8 _poolId) external override nonReentrant whenNotPaused {
        IPoolUtils poolUtils = IPoolUtils(staderConfig.getPoolUtils());
        if (!poolUtils.isExistingPoolId(_poolId)) {
            revert PoolIdDoesNotExit();
        }
        (, uint256 availableETHForNewDeposit) = SafeMath.trySub(
            address(this).balance,
            IUserWithdrawalManager(staderConfig.getUserWithdrawManager()).ethRequestedForWithdraw()
        );
        uint256 poolDepositSize = staderConfig.getStakedEthPerNode() - poolUtils.getCollateralETH(_poolId);

        if (availableETHForNewDeposit < poolDepositSize) {
            revert InsufficientBalance();
        }
        uint256 selectedPoolCapacity = IPoolSelector(staderConfig.getPoolSelector()).computePoolAllocationForDeposit(
            _poolId,
            (availableETHForNewDeposit / poolDepositSize)
        );

        if (selectedPoolCapacity == 0) {
            return;
        }
        address poolAddress = poolUtils.poolAddressById(_poolId);
        //slither-disable-next-line arbitrary-send-eth
        IStaderPoolBase(poolAddress).stakeUserETHToBeaconChain{value: selectedPoolCapacity * poolDepositSize}();
        emit ETHTransferredToPool(_poolId, poolAddress, selectedPoolCapacity * poolDepositSize);
    }

    /**
     * @notice pool selection for excess ETH supply after running `validatorBatchDeposit` for each pool
     * @dev permissionless call with cooldown period
     */
    function depositETHOverTargetWeight() external override nonReentrant {
        if (block.number < lastExcessETHDepositBlock + excessETHDepositCoolDown) {
            revert CooldownNotComplete();
        }
        IPoolUtils poolUtils = IPoolUtils(staderConfig.getPoolUtils());
        (, uint256 availableETHForNewDeposit) = SafeMath.trySub(
            address(this).balance,
            IUserWithdrawalManager(staderConfig.getUserWithdrawManager()).ethRequestedForWithdraw()
        );
        uint256 ETH_PER_NODE = staderConfig.getStakedEthPerNode();
        if (availableETHForNewDeposit < ETH_PER_NODE) {
            revert InsufficientBalance();
        }
        (uint256[] memory selectedPoolCapacity, uint8[] memory poolIdArray) = IPoolSelector(
            staderConfig.getPoolSelector()
        ).poolAllocationForExcessETHDeposit(availableETHForNewDeposit);

        uint256 poolCount = poolIdArray.length;
        for (uint256 i; i < poolCount; i++) {
            uint256 validatorToDeposit = selectedPoolCapacity[i];
            if (validatorToDeposit == 0) {
                continue;
            }
            address poolAddress = IPoolUtils(poolUtils).poolAddressById(poolIdArray[i]);
            uint256 poolDepositSize = ETH_PER_NODE - IPoolUtils(poolUtils).getCollateralETH(poolIdArray[i]);

            lastExcessETHDepositBlock = block.number;
            //slither-disable-next-line arbitrary-send-eth
            IStaderPoolBase(poolAddress).stakeUserETHToBeaconChain{value: validatorToDeposit * poolDepositSize}();
            emit ETHTransferredToPool(i, poolAddress, validatorToDeposit * poolDepositSize);
        }
    }

    /**
     * @dev Triggers stopped state.
     * Contract must not be paused
     */
    function pause() external {
        UtilLib.onlyManagerRole(msg.sender, staderConfig);
        _pause();
    }

    /**
     * @dev Returns to normal state.
     * Contract must be paused
     */
    function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _unpause();
    }

    /**
     * @dev Internal conversion function (from assets to shares) with support for rounding direction.
     *
     * Will revert if assets > 0, totalSupply > 0 and totalAssets = 0. That corresponds to a case where any asset
     * would represent an infinite amount of shares.
     */
    function _convertToShares(uint256 _assets, Math.Rounding rounding) internal view returns (uint256) {
        uint256 supply = IStaderOracle(staderConfig.getStaderOracle()).getExchangeRate().totalETHXSupply;
        return
            (_assets == 0 || supply == 0)
                ? initialConvertToShares(_assets, rounding)
                : _assets.mulDiv(supply, totalAssets(), rounding);
    }

    /**
     * @dev Internal conversion function (from assets to shares) to apply when the vault is empty.
     *
     * NOTE: Make sure to keep this function consistent with {_initialConvertToAssets} when overriding it.
     */
    function initialConvertToShares(
        uint256 _assets,
        Math.Rounding /*rounding*/
    ) internal pure returns (uint256 shares) {
        return _assets;
    }

    /**
     * @dev Internal conversion function (from shares to assets) with support for rounding direction.
     */
    function _convertToAssets(uint256 _shares, Math.Rounding rounding) internal view returns (uint256) {
        uint256 supply = IStaderOracle(staderConfig.getStaderOracle()).getExchangeRate().totalETHXSupply;
        return
            (supply == 0) ? initialConvertToAssets(_shares, rounding) : _shares.mulDiv(totalAssets(), supply, rounding);
    }

    /**
     * @dev Internal conversion function (from shares to assets) to apply when the vault is empty.
     *
     * NOTE: Make sure to keep this function consistent with {initialConvertToShares} when overriding it.
     */
    function initialConvertToAssets(
        uint256 _shares,
        Math.Rounding /*rounding*/
    ) internal pure returns (uint256) {
        return _shares;
    }

    /**
     * @dev Deposit/mint common workflow.
     */
    function _deposit(
        address _caller,
        address _receiver,
        uint256 _assets,
        uint256 _shares
    ) internal {
        ETHx(staderConfig.getETHxToken()).mint(_receiver, _shares);
        emit Deposited(_caller, _receiver, _assets, _shares);
    }

    /**
     * @dev Checks if vault is "healthy" in the sense of having assets backing the circulating shares.
     */
    function isVaultHealthy() public view override returns (bool) {
        return
            (totalAssets() > 0 ||
                IStaderOracle(staderConfig.getStaderOracle()).getExchangeRate().totalETHXSupply == 0) && (!paused());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0-rc.1) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControlUpgradeable.sol";
import "../utils/ContextUpgradeable.sol";
import "../utils/StringsUpgradeable.sol";
import "../utils/introspection/ERC165Upgradeable.sol";
import "../proxy/utils/Initializable.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 AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControlUpgradeable, ERC165Upgradeable {
    function __AccessControl_init() internal onlyInitializing {
    }

    function __AccessControl_init_unchained() internal onlyInitializing {
    }
    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);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControlUpgradeable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @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 virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        StringsUpgradeable.toHexString(account),
                        " is missing role ",
                        StringsUpgradeable.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 virtual 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.
     *
     * May emit a {RoleGranted} event.
     */
    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.
     *
     * May emit a {RoleRevoked} event.
     */
    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`.
     *
     * May emit a {RoleRevoked} event.
     */
    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.
     *
     * May emit a {RoleGranted} event.
     *
     * [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.
     *
     * May emit a {RoleGranted} event.
     */
    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.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _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 v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControlUpgradeable {
    /**
     * @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 (last updated v4.8.0-rc.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 Internal function that returns the initialized version. Returns `_initialized`
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Internal function that returns the initialized version. Returns `_initializing`
     */
    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-rc.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() {
        _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 (last updated v4.8.0-rc.1) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens 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 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @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[45] 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-rc.1) (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 v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.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 ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }

    /**
     * @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 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 IERC165Upgradeable {
    /**
     * @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 (last updated v4.8.0-rc.1) (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-rc.1) (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: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    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) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 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 256, 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 << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;
import './library/UtilLib.sol';

import './interfaces/IStaderConfig.sol';

import '@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol';

/**
 * @title ETHx token Contract
 * @author Stader Labs
 * @notice The ERC20 contract for the ETHx token
 */

contract ETHx is Initializable, ERC20Upgradeable, PausableUpgradeable, AccessControlUpgradeable {
    event UpdatedStaderConfig(address indexed _staderConfig);

    IStaderConfig public staderConfig;
    bytes32 public constant MINTER_ROLE = keccak256('MINTER_ROLE');
    bytes32 public constant BURNER_ROLE = keccak256('BURNER_ROLE');

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

    function initialize(address _admin, address _staderConfig) external initializer {
        UtilLib.checkNonZeroAddress(_admin);
        UtilLib.checkNonZeroAddress(_staderConfig);

        __ERC20_init('ETHx', 'ETHx');
        __Pausable_init();
        __AccessControl_init();

        staderConfig = IStaderConfig(_staderConfig);
        _grantRole(DEFAULT_ADMIN_ROLE, _admin);
        emit UpdatedStaderConfig(_staderConfig);
    }

    /**
     * @notice Mints ethX when called by an authorized caller
     * @param to the account to mint to
     * @param amount the amount of ethX to mint
     */
    function mint(address to, uint256 amount) external onlyRole(MINTER_ROLE) whenNotPaused {
        _mint(to, amount);
    }

    /**
     * @notice Burns ethX when called by an authorized caller
     * @param account the account to burn from
     * @param amount the amount of ethX to burn
     */
    function burnFrom(address account, uint256 amount) external onlyRole(BURNER_ROLE) whenNotPaused {
        _burn(account, amount);
    }

    /**
     * @dev Triggers stopped state.
     * Contract must not be paused.
     */
    function pause() external {
        UtilLib.onlyManagerRole(msg.sender, staderConfig);
        _pause();
    }

    /**
     * @dev Returns to normal state.
     * Contract must be paused
     */
    function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _unpause();
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal override whenNotPaused {
        super._beforeTokenTransfer(from, to, amount);
    }

    function updateStaderConfig(address _staderConfig) external onlyRole(DEFAULT_ADMIN_ROLE) {
        UtilLib.checkNonZeroAddress(_staderConfig);
        staderConfig = IStaderConfig(_staderConfig);
        emit UpdatedStaderConfig(_staderConfig);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

import '../library/ValidatorStatus.sol';

struct Validator {
    ValidatorStatus status; // status of validator
    bytes pubkey; //pubkey of the validator
    bytes preDepositSignature; //signature for 1 ETH deposit on beacon chain
    bytes depositSignature; //signature for 31 ETH deposit on beacon chain
    address withdrawVaultAddress; //withdrawal vault address of validator
    uint256 operatorId; // stader network assigned Id
    uint256 depositBlock; // block number of the 31ETH deposit
    uint256 withdrawnBlock; //block number when oracle report validator as withdrawn
}

struct Operator {
    bool active; // operator status
    bool optedForSocializingPool; // operator opted for socializing pool
    string operatorName; // name of the operator
    address payable operatorRewardAddress; //Eth1 address of node for reward
    address operatorAddress; //address of operator to interact with stader
}

// Interface for the NodeRegistry contract
interface INodeRegistry {
    // Errors
    error DuplicatePoolIDOrPoolNotAdded();
    error OperatorAlreadyOnBoardedInProtocol();
    error maxKeyLimitReached();
    error OperatorNotOnBoarded();
    error InvalidKeyCount();
    error InvalidStartAndEndIndex();
    error OperatorIsDeactivate();
    error MisMatchingInputKeysSize();
    error PageNumberIsZero();
    error UNEXPECTED_STATUS();
    error PubkeyAlreadyExist();
    error NotEnoughSDCollateral();
    error TooManyVerifiedKeysReported();
    error TooManyWithdrawnKeysReported();
    error CallerNotExistingRewardAddress();
    error CallerNotNewRewardAddress();

    // Events
    event AddedValidatorKey(address indexed nodeOperator, bytes pubkey, uint256 validatorId);
    event ValidatorMarkedAsFrontRunned(bytes pubkey, uint256 validatorId);
    event ValidatorWithdrawn(bytes pubkey, uint256 validatorId);
    event ValidatorStatusMarkedAsInvalidSignature(bytes pubkey, uint256 validatorId);
    event UpdatedValidatorDepositBlock(uint256 validatorId, uint256 depositBlock);
    event UpdatedMaxNonTerminalKeyPerOperator(uint64 maxNonTerminalKeyPerOperator);
    event UpdatedInputKeyCountLimit(uint256 batchKeyDepositLimit);
    event UpdatedStaderConfig(address staderConfig);
    event RewardAddressProposed(address indexed nodeOperator, address indexed rewardAddress);
    event OperatorRewardAddressUpdated(address indexed nodeOperator, address indexed rewardAddress);
    event UpdatedOperatorName(address indexed nodeOperator, string operatorName);
    event IncreasedTotalActiveValidatorCount(uint256 totalActiveValidatorCount);
    event UpdatedVerifiedKeyBatchSize(uint256 verifiedKeysBatchSize);
    event UpdatedWithdrawnKeyBatchSize(uint256 withdrawnKeysBatchSize);
    event DecreasedTotalActiveValidatorCount(uint256 totalActiveValidatorCount);

    function withdrawnValidators(bytes[] calldata _pubkeys) external;

    function markValidatorReadyToDeposit(
        bytes[] calldata _readyToDepositPubkey,
        bytes[] calldata _frontRunPubkey,
        bytes[] calldata _invalidSignaturePubkey
    ) external;

    // return validator struct for a validator Id
    function validatorRegistry(uint256)
        external
        view
        returns (
            ValidatorStatus status,
            bytes calldata pubkey,
            bytes calldata preDepositSignature,
            bytes calldata depositSignature,
            address withdrawVaultAddress,
            uint256 operatorId,
            uint256 depositTime,
            uint256 withdrawnTime
        );

    // returns the operator struct given operator Id
    function operatorStructById(uint256)
        external
        view
        returns (
            bool active,
            bool optedForSocializingPool,
            string calldata operatorName,
            address payable operatorRewardAddress,
            address operatorAddress
        );

    // Returns the last block the operator changed the opt-in status for socializing pool
    function getSocializingPoolStateChangeBlock(uint256 _operatorId) external view returns (uint256);

    function getAllActiveValidators(uint256 _pageNumber, uint256 _pageSize) external view returns (Validator[] memory);

    function getValidatorsByOperator(
        address _operator,
        uint256 _pageNumber,
        uint256 _pageSize
    ) external view returns (Validator[] memory);

    /**
     *
     * @param _nodeOperator @notice operator total non withdrawn keys within a specified validator list
     * @param _startIndex start index in validator queue to start with
     * @param _endIndex  up to end index of validator queue to to count
     */
    function getOperatorTotalNonTerminalKeys(
        address _nodeOperator,
        uint256 _startIndex,
        uint256 _endIndex
    ) external view returns (uint64);

    // returns the total number of queued validators across all operators
    function getTotalQueuedValidatorCount() external view returns (uint256);

    // returns the total number of active validators across all operators
    function getTotalActiveValidatorCount() external view returns (uint256);

    function getCollateralETH() external view returns (uint256);

    function getOperatorTotalKeys(uint256 _operatorId) external view returns (uint256 totalKeys);

    function operatorIDByAddress(address) external view returns (uint256);

    function getOperatorRewardAddress(uint256 _operatorId) external view returns (address payable);

    function isExistingPubkey(bytes calldata _pubkey) external view returns (bool);

    function isExistingOperator(address _operAddr) external view returns (bool);

    function POOL_ID() external view returns (uint8);

    function inputKeyCountLimit() external view returns (uint16);

    function nextOperatorId() external view returns (uint256);

    function nextValidatorId() external view returns (uint256);

    function maxNonTerminalKeyPerOperator() external view returns (uint64);

    function verifiedKeyBatchSize() external view returns (uint256);

    function totalActiveValidatorCount() external view returns (uint256);

    function validatorIdByPubkey(bytes calldata _pubkey) external view returns (uint256);

    function validatorIdsByOperatorId(uint256, uint256) external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

interface IPoolSelector {
    // Error
    error InvalidTargetWeight();
    error InvalidNewTargetInput();
    error InvalidSumOfPoolWeights();

    // Events

    event UpdatedPoolWeight(uint8 indexed poolId, uint256 poolWeight);
    event UpdatedPoolAllocationMaxSize(uint16 poolAllocationMaxSize);
    event UpdatedStaderConfig(address staderConfig);

    // Getters

    // returns the index in poolIdArray of the pool with excess supply
    function poolIdArrayIndexForExcessDeposit() external view returns (uint256);

    function computePoolAllocationForDeposit(uint8, uint256) external view returns (uint256);

    function poolAllocationForExcessETHDeposit(uint256 _excessETH) external returns (uint256[] memory, uint8[] memory);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

import './INodeRegistry.sol';

// Interface for the PoolUtils contract
interface IPoolUtils {
    // Errors
    error EmptyNameString();
    error PoolIdNotPresent();
    error MismatchingPoolId();
    error PubkeyDoesNotExit();
    error PubkeyAlreadyExist();
    error NameCrossedMaxLength();
    error InvalidLengthOfPubkey();
    error OperatorIsNotOnboarded();
    error InvalidLengthOfSignature();
    error ExistingOrMismatchingPoolId();

    // Events
    event PoolAdded(uint8 indexed poolId, address poolAddress);
    event PoolAddressUpdated(uint8 indexed poolId, address poolAddress);
    event DeactivatedPool(uint8 indexed poolId, address poolAddress);
    event UpdatedStaderConfig(address staderConfig);
    event ExitValidator(bytes pubkey);

    // returns the details of a specific pool
    function poolAddressById(uint8) external view returns (address poolAddress);

    function poolIdArray(uint256) external view returns (uint8);

    function getPoolIdArray() external view returns (uint8[] memory);

    // Pool functions
    function addNewPool(uint8 _poolId, address _poolAddress) external;

    function updatePoolAddress(uint8 _poolId, address _poolAddress) external;

    function processValidatorExitList(bytes[] calldata _pubkeys) external;

    function getOperatorTotalNonTerminalKeys(
        uint8 _poolId,
        address _nodeOperator,
        uint256 _startIndex,
        uint256 _endIndex
    ) external view returns (uint256);

    function getSocializingPoolAddress(uint8 _poolId) external view returns (address);

    // Pool getters
    function getProtocolFee(uint8 _poolId) external view returns (uint256); // returns the protocol fee (0-10000)

    function getOperatorFee(uint8 _poolId) external view returns (uint256); // returns the operator fee (0-10000)

    function getTotalActiveValidatorCount() external view returns (uint256); //returns total active validators across all pools

    function getActiveValidatorCountByPool(uint8 _poolId) external view returns (uint256); // returns the total number of active validators in a specific pool

    function getQueuedValidatorCountByPool(uint8 _poolId) external view returns (uint256); // returns the total number of queued validators in a specific pool

    function getCollateralETH(uint8 _poolId) external view returns (uint256);

    function getNodeRegistry(uint8 _poolId) external view returns (address);

    // check for duplicate pubkey across all pools
    function isExistingPubkey(bytes calldata _pubkey) external view returns (bool);

    // check for duplicate operator across all pools
    function isExistingOperator(address _operAddr) external view returns (bool);

    function isExistingPoolId(uint8 _poolId) external view returns (bool);

    function getOperatorPoolId(address _operAddr) external view returns (uint8);

    function getValidatorPoolId(bytes calldata _pubkey) external view returns (uint8);

    function onlyValidName(string calldata _name) external;

    function onlyValidKeys(
        bytes calldata _pubkey,
        bytes calldata _preDepositSignature,
        bytes calldata _depositSignature
    ) external;

    function calculateRewardShare(uint8 _poolId, uint256 _totalRewards)
        external
        view
        returns (
            uint256 userShare,
            uint256 operatorShare,
            uint256 protocolShare
        );
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.16;

import './IStaderConfig.sol';

/// @title RewardsData
/// @notice This struct holds rewards merkleRoot and rewards split
struct RewardsData {
    /// @notice The block number when the rewards data was last updated
    uint256 reportingBlockNumber;
    /// @notice The index of merkle tree or rewards cycle
    uint256 index;
    /// @notice The merkle root hash
    bytes32 merkleRoot;
    /// @notice pool id of operators
    uint8 poolId;
    /// @notice operator ETH rewards for index cycle
    uint256 operatorETHRewards;
    /// @notice user ETH rewards for index cycle
    uint256 userETHRewards;
    /// @notice protocol ETH rewards for index cycle
    uint256 protocolETHRewards;
    /// @notice operator SD rewards for index cycle
    uint256 operatorSDRewards;
}

interface ISocializingPool {
    // errors
    error ETHTransferFailed(address recipient, uint256 amount);
    error SDTransferFailed();
    error RewardAlreadyHandled();
    error RewardAlreadyClaimed(address operator, uint256 cycle);
    error InsufficientETHRewards();
    error InsufficientSDRewards();
    error InvalidAmount();
    error InvalidProof(uint256 cycle, address operator);
    error InvalidCycleIndex();
    error FutureCycleIndex();

    // events
    event UpdatedStaderConfig(address indexed staderConfig);
    event ETHReceived(address indexed sender, uint256 amount);
    event UpdatedStaderValidatorRegistry(address indexed staderValidatorRegistry);
    event UpdatedStaderOperatorRegistry(address indexed staderOperatorRegistry);
    event OperatorRewardsClaimed(address indexed recipient, uint256 ethRewards, uint256 sdRewards);
    event OperatorRewardsUpdated(
        uint256 ethRewards,
        uint256 totalETHRewards,
        uint256 sdRewards,
        uint256 totalSDRewards
    );

    event UserETHRewardsTransferred(uint256 ethRewards);
    event ProtocolETHRewardsTransferred(uint256 ethRewards);

    // methods
    function handleRewards(RewardsData calldata _rewardsData) external;

    function claim(
        uint256[] calldata _index,
        uint256[] calldata _amountSD,
        uint256[] calldata _amountETH,
        bytes32[][] calldata _merkleProof
    ) external;

    // setters
    function updateStaderConfig(address _staderConfig) external;

    // getters
    function staderConfig() external view returns (IStaderConfig);

    function claimedRewards(address _user, uint256 _index) external view returns (bool);

    function totalOperatorETHRewardsRemaining() external view returns (uint256);

    function totalOperatorSDRewardsRemaining() external view returns (uint256);

    function initialBlock() external view returns (uint256);

    function verifyProof(
        uint256 _index,
        address _operator,
        uint256 _amountSD,
        uint256 _amountETH,
        bytes32[] calldata _merkleProof
    ) external view returns (bool);

    function getCurrentRewardsIndex() external view returns (uint256 index);

    function getRewardDetails()
        external
        view
        returns (
            uint256 currentIndex,
            uint256 currentStartBlock,
            uint256 currentEndBlock
        );

    function getRewardCycleDetails(uint256 _index) external view returns (uint256 _startBlock, uint256 _endBlock);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

interface IStaderConfig {
    // Errors
    error InvalidLimits();
    error InvalidMinDepositValue();
    error InvalidMaxDepositValue();
    error InvalidMinWithdrawValue();
    error InvalidMaxWithdrawValue();
    error IndenticalValue();

    // Events
    event SetConstant(bytes32 key, uint256 amount);
    event SetVariable(bytes32 key, uint256 amount);
    event SetAccount(bytes32 key, address newAddress);
    event SetContract(bytes32 key, address newAddress);
    event SetToken(bytes32 key, address newAddress);

    //Contracts
    function POOL_UTILS() external view returns (bytes32);

    function POOL_SELECTOR() external view returns (bytes32);

    function SD_COLLATERAL() external view returns (bytes32);

    function OPERATOR_REWARD_COLLECTOR() external view returns (bytes32);

    function VAULT_FACTORY() external view returns (bytes32);

    function STADER_ORACLE() external view returns (bytes32);

    function AUCTION_CONTRACT() external view returns (bytes32);

    function PENALTY_CONTRACT() external view returns (bytes32);

    function PERMISSIONED_POOL() external view returns (bytes32);

    function STAKE_POOL_MANAGER() external view returns (bytes32);

    function ETH_DEPOSIT_CONTRACT() external view returns (bytes32);

    function PERMISSIONLESS_POOL() external view returns (bytes32);

    function USER_WITHDRAW_MANAGER() external view returns (bytes32);

    function STADER_INSURANCE_FUND() external view returns (bytes32);

    function PERMISSIONED_NODE_REGISTRY() external view returns (bytes32);

    function PERMISSIONLESS_NODE_REGISTRY() external view returns (bytes32);

    function PERMISSIONED_SOCIALIZING_POOL() external view returns (bytes32);

    function PERMISSIONLESS_SOCIALIZING_POOL() external view returns (bytes32);

    function NODE_EL_REWARD_VAULT_IMPLEMENTATION() external view returns (bytes32);

    function VALIDATOR_WITHDRAWAL_VAULT_IMPLEMENTATION() external view returns (bytes32);

    //POR Feed Proxy
    function ETH_BALANCE_POR_FEED() external view returns (bytes32);

    function ETHX_SUPPLY_POR_FEED() external view returns (bytes32);

    //Roles
    function MANAGER() external view returns (bytes32);

    function OPERATOR() external view returns (bytes32);

    // Constants
    function getStakedEthPerNode() external view returns (uint256);

    function getPreDepositSize() external view returns (uint256);

    function getFullDepositSize() external view returns (uint256);

    function getDecimals() external view returns (uint256);

    function getTotalFee() external view returns (uint256);

    function getOperatorMaxNameLength() external view returns (uint256);

    // Variables
    function getSocializingPoolCycleDuration() external view returns (uint256);

    function getSocializingPoolOptInCoolingPeriod() external view returns (uint256);

    function getRewardsThreshold() external view returns (uint256);

    function getMinDepositAmount() external view returns (uint256);

    function getMaxDepositAmount() external view returns (uint256);

    function getMinWithdrawAmount() external view returns (uint256);

    function getMaxWithdrawAmount() external view returns (uint256);

    function getMinBlockDelayToFinalizeWithdrawRequest() external view returns (uint256);

    function getWithdrawnKeyBatchSize() external view returns (uint256);

    // Accounts
    function getAdmin() external view returns (address);

    function getStaderTreasury() external view returns (address);

    // Contracts
    function getPoolUtils() external view returns (address);

    function getPoolSelector() external view returns (address);

    function getSDCollateral() external view returns (address);

    function getOperatorRewardsCollector() external view returns (address);

    function getVaultFactory() external view returns (address);

    function getStaderOracle() external view returns (address);

    function getAuctionContract() external view returns (address);

    function getPenaltyContract() external view returns (address);

    function getPermissionedPool() external view returns (address);

    function getStakePoolManager() external view returns (address);

    function getETHDepositContract() external view returns (address);

    function getPermissionlessPool() external view returns (address);

    function getUserWithdrawManager() external view returns (address);

    function getStaderInsuranceFund() external view returns (address);

    function getPermissionedNodeRegistry() external view returns (address);

    function getPermissionlessNodeRegistry() external view returns (address);

    function getPermissionedSocializingPool() external view returns (address);

    function getPermissionlessSocializingPool() external view returns (address);

    function getNodeELRewardVaultImplementation() external view returns (address);

    function getValidatorWithdrawalVaultImplementation() external view returns (address);

    function getETHBalancePORFeedProxy() external view returns (address);

    function getETHXSupplyPORFeedProxy() external view returns (address);

    // Tokens
    function getStaderToken() external view returns (address);

    function getETHxToken() external view returns (address);

    //checks roles and stader contracts
    function onlyStaderContract(address _addr, bytes32 _contractName) external view returns (bool);

    function onlyManagerRole(address account) external view returns (bool);

    function onlyOperatorRole(address account) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

import '../library/ValidatorStatus.sol';

import './ISocializingPool.sol';
import './IStaderConfig.sol';

struct SDPriceData {
    uint256 reportingBlockNumber;
    uint256 sdPriceInETH;
}

/// @title MissedAttestationPenaltyData
/// @notice This struct holds missed attestation penalty data
struct MissedAttestationPenaltyData {
    /// @notice The block number when the missed attestation penalty data is reported
    uint256 reportingBlockNumber;
    /// @notice The index of missed attestation penalty data
    uint256 index;
    /// @notice missed attestation validator pubkeys
    bytes[] sortedPubkeys;
}

struct MissedAttestationReportInfo {
    uint256 index;
    uint256 pageNumber;
}

/// @title ExchangeRate
/// @notice This struct holds data related to the exchange rate between ETH and ETHX.
struct ExchangeRate {
    /// @notice The block number when the exchange rate was last updated.
    uint256 reportingBlockNumber;
    /// @notice The total balance of Ether (ETH) in the system.
    uint256 totalETHBalance;
    /// @notice The total supply of the liquid staking token (ETHX) in the system.
    uint256 totalETHXSupply;
}

/// @title ValidatorStats
/// @notice This struct holds statistics related to validators in the beaconchain.
struct ValidatorStats {
    /// @notice The block number when the validator stats was last updated.
    uint256 reportingBlockNumber;
    /// @notice The total balance of all exiting validators.
    uint128 exitingValidatorsBalance;
    /// @notice The total balance of all exited validators.
    uint128 exitedValidatorsBalance;
    /// @notice The total balance of all slashed validators.
    uint128 slashedValidatorsBalance;
    /// @notice The number of currently exiting validators.
    uint32 exitingValidatorsCount;
    /// @notice The number of validators that have exited.
    uint32 exitedValidatorsCount;
    /// @notice The number of validators that have been slashed.
    uint32 slashedValidatorsCount;
}

struct WithdrawnValidators {
    uint8 poolId;
    uint256 reportingBlockNumber;
    bytes[] sortedPubkeys;
}

struct ValidatorVerificationDetail {
    uint8 poolId;
    uint256 reportingBlockNumber;
    bytes[] sortedReadyToDepositPubkeys;
    bytes[] sortedFrontRunPubkeys;
    bytes[] sortedInvalidSignaturePubkeys;
}

interface IStaderOracle {
    // Error
    error InvalidUpdate();
    error NodeAlreadyTrusted();
    error NodeNotTrusted();
    error ZeroFrequency();
    error FrequencyUnchanged();
    error DuplicateSubmissionFromNode();
    error ReportingFutureBlockData();
    error InvalidMerkleRootIndex();
    error ReportingPreviousCycleData();
    error InvalidMAPDIndex();
    error PageNumberAlreadyReported();
    error NotATrustedNode();
    error InvalidERDataSource();
    error InspectionModeActive();
    error UpdateFrequencyNotSet();
    error InvalidReportingBlock();
    error ERChangeLimitCrossed();
    error ERChangeLimitNotCrossed();
    error ERPermissibleChangeOutofBounds();
    error InsufficientTrustedNodes();
    error CooldownNotComplete();

    // Events
    event ERDataSourceToggled(bool isPORBasedERData);
    event UpdatedERChangeLimit(uint256 erChangeLimit);
    event ERInspectionModeActivated(bool erInspectionMode, uint256 time);
    event ExchangeRateSubmitted(
        address indexed from,
        uint256 block,
        uint256 totalEth,
        uint256 ethxSupply,
        uint256 time
    );
    event ExchangeRateUpdated(uint256 block, uint256 totalEth, uint256 ethxSupply, uint256 time);
    event TrustedNodeAdded(address indexed node);
    event TrustedNodeRemoved(address indexed node);
    event SocializingRewardsMerkleRootSubmitted(
        address indexed node,
        uint256 index,
        bytes32 merkleRoot,
        uint8 poolId,
        uint256 block
    );
    event SocializingRewardsMerkleRootUpdated(uint256 index, bytes32 merkleRoot, uint8 poolId, uint256 block);
    event SDPriceSubmitted(address indexed node, uint256 sdPriceInETH, uint256 reportedBlock, uint256 block);
    event SDPriceUpdated(uint256 sdPriceInETH, uint256 reportedBlock, uint256 block);

    event MissedAttestationPenaltySubmitted(
        address indexed node,
        uint256 index,
        uint256 block,
        uint256 reportingBlockNumber,
        bytes[] pubkeys
    );
    event MissedAttestationPenaltyUpdated(uint256 index, uint256 block, bytes[] pubkeys);
    event UpdateFrequencyUpdated(uint256 updateFrequency);
    event ValidatorStatsSubmitted(
        address indexed from,
        uint256 block,
        uint256 activeValidatorsBalance,
        uint256 exitedValidatorsBalance,
        uint256 slashedValidatorsBalance,
        uint256 activeValidatorsCount,
        uint256 exitedValidatorsCount,
        uint256 slashedValidatorsCount,
        uint256 time
    );
    event ValidatorStatsUpdated(
        uint256 block,
        uint256 activeValidatorsBalance,
        uint256 exitedValidatorsBalance,
        uint256 slashedValidatorsBalance,
        uint256 activeValidatorsCount,
        uint256 exitedValidatorsCount,
        uint256 slashedValidatorsCount,
        uint256 time
    );
    event WithdrawnValidatorsSubmitted(
        address indexed from,
        uint8 poolId,
        uint256 block,
        bytes[] pubkeys,
        uint256 time
    );
    event WithdrawnValidatorsUpdated(uint8 poolId, uint256 block, bytes[] pubkeys, uint256 time);
    event ValidatorVerificationDetailSubmitted(
        address indexed from,
        uint8 poolId,
        uint256 block,
        bytes[] sortedReadyToDepositPubkeys,
        bytes[] sortedFrontRunPubkeys,
        bytes[] sortedInvalidSignaturePubkeys,
        uint256 time
    );
    event ValidatorVerificationDetailUpdated(
        uint8 poolId,
        uint256 block,
        bytes[] sortedReadyToDepositPubkeys,
        bytes[] sortedFrontRunPubkeys,
        bytes[] sortedInvalidSignaturePubkeys,
        uint256 time
    );
    event SafeModeEnabled();
    event SafeModeDisabled();
    event UpdatedStaderConfig(address staderConfig);
    event TrustedNodeChangeCoolingPeriodUpdated(uint256 trustedNodeChangeCoolingPeriod);

    // methods

    function addTrustedNode(address _nodeAddress) external;

    function removeTrustedNode(address _nodeAddress) external;

    /**
     * @notice submit exchange rate data by trusted oracle nodes
    @dev Submits the given balances for a specified block number.
    @param _exchangeRate The exchange rate to submit.
    */
    function submitExchangeRateData(ExchangeRate calldata _exchangeRate) external;

    //update the exchange rate via POR Feed data
    function updateERFromPORFeed() external;

    //update exchange rate via POR Feed when ER change limit is crossed
    function closeERInspectionMode() external;

    function disableERInspectionMode() external;

    /**
    @notice Submits the root of the merkle tree containing the socializing rewards.
    sends user ETH Rewards to SSPM
    sends protocol ETH Rewards to stader treasury
    @param _rewardsData contains rewards merkleRoot and rewards split
    */
    function submitSocializingRewardsMerkleRoot(RewardsData calldata _rewardsData) external;

    function submitSDPrice(SDPriceData calldata _sdPriceData) external;

    /**
     * @notice Submit validator stats for a specific block.
     * @dev This function can only be called by trusted nodes.
     * @param _validatorStats The validator stats to submit.
     *
     * Function Flow:
     * 1. Validates that the submission is for a past block and not a future one.
     * 2. Validates that the submission is for a block higher than the last block number with updated counts.
     * 3. Generates submission keys using the input parameters.
     * 4. Validates that this is not a duplicate submission from the same node.
     * 5. Updates the submission count for the given counts.
     * 6. Emits a ValidatorCountsSubmitted event with the submitted data.
     * 7. If the submission count reaches a majority (trustedNodesCount / 2 + 1), checks whether the counts are not already updated,
     *    then updates the validator counts, and emits a CountsUpdated event.
     */
    function submitValidatorStats(ValidatorStats calldata _validatorStats) external;

    /// @notice Submit the withdrawn validators list to the oracle.
    /// @dev The function checks if the submitted data is for a valid and newer block,
    ///      and if the submission count reaches the required threshold, it updates the withdrawn validators list (NodeRegistry).
    /// @param _withdrawnValidators The withdrawn validators data, including blockNumber and sorted pubkeys.
    function submitWithdrawnValidators(WithdrawnValidators calldata _withdrawnValidators) external;

    /**
     * @notice submit the ready to deposit keys, front run keys and invalid signature keys
     * @dev The function checks if the submitted data is for a valid and newer block,
     *  and if the submission count reaches the required threshold, it updates the markValidatorReadyToDeposit (NodeRegistry).
     * @param _validatorVerificationDetail validator verification data, containing valid pubkeys, front run and invalid signature
     */
    function submitValidatorVerificationDetail(ValidatorVerificationDetail calldata _validatorVerificationDetail)
        external;

    /**
     * @notice store the missed attestation penalty strike on validator
     * @dev _missedAttestationPenaltyData.index should not be zero
     * @param _mapd missed attestation penalty data
     */
    function submitMissedAttestationPenalties(MissedAttestationPenaltyData calldata _mapd) external;

    // setters
    // enable the safeMode depending on network and protocol health
    function enableSafeMode() external;

    // disable safe mode
    function disableSafeMode() external;

    function updateStaderConfig(address _staderConfig) external;

    function setERUpdateFrequency(uint256 _updateFrequency) external;

    function setSDPriceUpdateFrequency(uint256 _updateFrequency) external;

    function setValidatorStatsUpdateFrequency(uint256 _updateFrequency) external;

    function setValidatorVerificationDetailUpdateFrequency(uint256 _updateFrequency) external;

    function setWithdrawnValidatorsUpdateFrequency(uint256 _updateFrequency) external;

    function setMissedAttestationPenaltyUpdateFrequency(uint256 _updateFrequency) external;

    function updateERChangeLimit(uint256 _erChangeLimit) external;

    function togglePORFeedBasedERData() external;

    // getters
    function trustedNodeChangeCoolingPeriod() external view returns (uint256);

    function lastTrustedNodeCountChangeBlock() external view returns (uint256);

    function erInspectionMode() external view returns (bool);

    function isPORFeedBasedERData() external view returns (bool);

    function staderConfig() external view returns (IStaderConfig);

    function erChangeLimit() external view returns (uint256);

    // returns the last reported block number of withdrawn validators for a poolId
    function lastReportingBlockNumberForWithdrawnValidatorsByPoolId(uint8) external view returns (uint256);

    // returns the last reported block number of validator verification detail for a poolId
    function lastReportingBlockNumberForValidatorVerificationDetailByPoolId(uint8) external view returns (uint256);

    // returns the count of trusted nodes
    function trustedNodesCount() external view returns (uint256);

    //returns the latest consensus index for missed attestation penalty data report
    function lastReportedMAPDIndex() external view returns (uint256);

    function erInspectionModeStartBlock() external view returns (uint256);

    function safeMode() external view returns (bool);

    function isTrustedNode(address) external view returns (bool);

    function missedAttestationPenalty(bytes32 _pubkey) external view returns (uint16);

    // The last updated merkle tree index
    function getCurrentRewardsIndexByPoolId(uint8 _poolId) external view returns (uint256);

    function getERReportableBlock() external view returns (uint256);

    function getMerkleRootReportableBlockByPoolId(uint8 _poolId) external view returns (uint256);

    function getSDPriceReportableBlock() external view returns (uint256);

    function getValidatorStatsReportableBlock() external view returns (uint256);

    function getWithdrawnValidatorReportableBlock() external view returns (uint256);

    function getValidatorVerificationDetailReportableBlock() external view returns (uint256);

    function getMissedAttestationPenaltyReportableBlock() external view returns (uint256);

    function getExchangeRate() external view returns (ExchangeRate memory);

    function getValidatorStats() external view returns (ValidatorStats memory);

    // returns price of 1 SD in ETH
    function getSDPriceInETH() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

import './INodeRegistry.sol';

interface IStaderPoolBase {
    // Errors
    error UnsupportedOperation();
    error InvalidCommission();
    error CouldNotDetermineExcessETH();

    // Events
    event ValidatorPreDepositedOnBeaconChain(bytes pubKey);
    event ValidatorDepositedOnBeaconChain(uint256 indexed validatorId, bytes pubKey);
    event UpdatedCommissionFees(uint256 protocolFee, uint256 operatorFee);
    event ReceivedCollateralETH(uint256 amount);
    event UpdatedStaderConfig(address staderConfig);
    event ReceivedInsuranceFund(uint256 amount);
    event TransferredETHToSSPMForDefectiveKeys(uint256 amount);

    // Setters

    function setCommissionFees(uint256 _protocolFee, uint256 _operatorFee) external; // sets the commission fees, protocol and operator

    //Getters

    function protocolFee() external view returns (uint256); // returns the protocol fee

    function operatorFee() external view returns (uint256); // returns the operator fee

    function getTotalActiveValidatorCount() external view returns (uint256); // returns the total number of active validators across all operators

    function getTotalQueuedValidatorCount() external view returns (uint256); // returns the total number of queued validators across all operators

    function getOperatorTotalNonTerminalKeys(
        address _nodeOperator,
        uint256 _startIndex,
        uint256 _endIndex
    ) external view returns (uint256);

    function stakeUserETHToBeaconChain() external payable;

    function getSocializingPoolAddress() external view returns (address);

    function getCollateralETH() external view returns (uint256);

    function getNodeRegistry() external view returns (address);

    function isExistingPubkey(bytes calldata _pubkey) external view returns (bool);

    function isExistingOperator(address _operAddr) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.16;

interface IStaderStakePoolManager {
    // Errors
    error InvalidDepositAmount();
    error UnsupportedOperation();
    error InsufficientBalance();
    error TransferFailed();
    error PoolIdDoesNotExit();
    error CooldownNotComplete();
    error UnsupportedOperationInSafeMode();

    // Events
    event UpdatedStaderConfig(address staderConfig);
    event DepositReferral(
        address indexed caller,
        address indexed owner,
        uint256 assets,
        uint256 shares,
        string referralId
    );
    event Deposited(address indexed caller, address indexed owner, uint256 assets, uint256 shares);
    event ExecutionLayerRewardsReceived(uint256 amount);
    event AuctionedEthReceived(uint256 amount);
    event ReceivedExcessEthFromPool(uint8 indexed poolId);
    event TransferredETHToUserWithdrawManager(uint256 amount);
    event ETHTransferredToPool(uint256 indexed poolId, address poolAddress, uint256 validatorCount);
    event WithdrawVaultUserShareReceived(uint256 amount);
    event UpdatedExcessETHDepositCoolDown(uint256 excessETHDepositCoolDown);

    function deposit(address _receiver, string calldata _referralId) external payable returns (uint256);

    function deposit(address _receiver) external payable returns (uint256);

    function previewDeposit(uint256 _assets) external view returns (uint256);

    function previewWithdraw(uint256 _shares) external view returns (uint256);

    function getExchangeRate() external view returns (uint256);

    function totalAssets() external view returns (uint256);

    function convertToShares(uint256 _assets) external view returns (uint256);

    function convertToAssets(uint256 _shares) external view returns (uint256);

    function maxDeposit() external view returns (uint256);

    function minDeposit() external view returns (uint256);

    function receiveExecutionLayerRewards() external payable;

    function receiveWithdrawVaultUserShare() external payable;

    function receiveEthFromAuction() external payable;

    function receiveExcessEthFromPool(uint8 _poolId) external payable;

    function transferETHToUserWithdrawManager(uint256 _amount) external;

    function validatorBatchDeposit(uint8 _poolId) external;

    function depositETHOverTargetWeight() external;

    function isVaultHealthy() external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.16;

interface IUserWithdrawalManager {
    // Errors
    error ETHTransferFailed();
    error UnsupportedOperationInSafeMode();
    error InSufficientBalance();
    error ProtocolNotHealthy();
    error InvalidWithdrawAmount();
    error requestIdNotFinalized(uint256 _requestId);
    error RequestAlreadyRedeemed(uint256 _requestId);
    error MaxLimitOnWithdrawRequestCountReached();
    error CannotFindRequestId();
    error CallerNotAuthorizedToRedeem();
    error ZeroAddressReceived();

    // Events
    event UpdatedFinalizationBatchLimit(uint256 paginationLimit);
    event UpdatedStaderConfig(address staderConfig);
    event WithdrawRequestReferral(
        address indexed _msgSender,
        address _recipient,
        uint256 _requestId,
        uint256 _sharesAmount,
        uint256 _ethAmount,
        string _referralId
    );
    event WithdrawRequestReceived(
        address indexed _msgSender,
        address _recipient,
        uint256 _requestId,
        uint256 _sharesAmount,
        uint256 _etherAmount
    );
    // finalized request upto `requestId`
    event FinalizedWithdrawRequest(uint256 requestId);
    event RequestRedeemed(address indexed _sender, address _recipient, uint256 _ethTransferred);
    event RecipientAddressUpdated(
        address indexed _sender,
        uint256 _requestId,
        address _oldRecipient,
        address _newRecipient
    );
    event ReceivedETH(uint256 _amount);

    function finalizationBatchLimit() external view returns (uint256);

    function nextRequestIdToFinalize() external view returns (uint256);

    function nextRequestId() external view returns (uint256);

    function ethRequestedForWithdraw() external view returns (uint256);

    function maxNonRedeemedUserRequestCount() external view returns (uint256);

    function userWithdrawRequests(uint256)
        external
        view
        returns (
            address payable owner,
            uint256 ethXAmount,
            uint256 ethExpected,
            uint256 ethFinalized,
            uint256 requestTime
        );

    function requestIdsByUserAddress(address, uint256) external view returns (uint256);

    function updateFinalizationBatchLimit(uint256 _paginationLimit) external;

    function requestWithdraw(
        uint256 _ethXAmount,
        address receiver,
        string calldata referralId
    ) external returns (uint256);

    function requestWithdraw(uint256 _ethXAmount, address receiver) external returns (uint256);

    function finalizeUserWithdrawalRequest() external;

    function claim(uint256 _requestId) external;

    function getRequestIdsByUser(address _owner) external view returns (uint256[] memory);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

import './IStaderConfig.sol';

interface IVaultProxy {
    error CallerNotOwner();
    error AlreadyInitialized();
    event UpdatedOwner(address owner);
    event UpdatedStaderConfig(address staderConfig);

    //Getters
    function vaultSettleStatus() external view returns (bool);

    function isValidatorWithdrawalVault() external view returns (bool);

    function isInitialized() external view returns (bool);

    function poolId() external view returns (uint8);

    function id() external view returns (uint256);

    function owner() external view returns (address);

    function staderConfig() external view returns (IStaderConfig);

    //Setters
    function updateOwner() external;

    function updateStaderConfig(address _staderConfig) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

import '../interfaces/IStaderConfig.sol';
import '../interfaces/INodeRegistry.sol';
import '../interfaces/IPoolUtils.sol';
import '../interfaces/IVaultProxy.sol';

library UtilLib {
    error ZeroAddress();
    error InvalidPubkeyLength();
    error CallerNotManager();
    error CallerNotOperator();
    error CallerNotStaderContract();
    error CallerNotWithdrawVault();
    error TransferFailed();

    uint64 private constant VALIDATOR_PUBKEY_LENGTH = 48;

    /// @notice zero address check modifier
    function checkNonZeroAddress(address _address) internal pure {
        if (_address == address(0)) revert ZeroAddress();
    }

    //checks for Manager role in staderConfig
    function onlyManagerRole(address _addr, IStaderConfig _staderConfig) internal view {
        if (!_staderConfig.onlyManagerRole(_addr)) {
            revert CallerNotManager();
        }
    }

    function onlyOperatorRole(address _addr, IStaderConfig _staderConfig) internal view {
        if (!_staderConfig.onlyOperatorRole(_addr)) {
            revert CallerNotOperator();
        }
    }

    //checks if caller is a stader contract address
    function onlyStaderContract(
        address _addr,
        IStaderConfig _staderConfig,
        bytes32 _contractName
    ) internal view {
        if (!_staderConfig.onlyStaderContract(_addr, _contractName)) {
            revert CallerNotStaderContract();
        }
    }

    function getPubkeyForValidSender(
        uint8 _poolId,
        uint256 _validatorId,
        address _addr,
        IStaderConfig _staderConfig
    ) internal view returns (bytes memory) {
        address nodeRegistry = IPoolUtils(_staderConfig.getPoolUtils()).getNodeRegistry(_poolId);
        (, bytes memory pubkey, , , address withdrawVaultAddress, , , ) = INodeRegistry(nodeRegistry).validatorRegistry(
            _validatorId
        );
        if (_addr != withdrawVaultAddress) {
            revert CallerNotWithdrawVault();
        }
        return pubkey;
    }

    function getOperatorForValidSender(
        uint8 _poolId,
        uint256 _validatorId,
        address _addr,
        IStaderConfig _staderConfig
    ) internal view returns (address) {
        address nodeRegistry = IPoolUtils(_staderConfig.getPoolUtils()).getNodeRegistry(_poolId);
        (, , , , address withdrawVaultAddress, uint256 operatorId, , ) = INodeRegistry(nodeRegistry).validatorRegistry(
            _validatorId
        );
        if (_addr != withdrawVaultAddress) {
            revert CallerNotWithdrawVault();
        }
        (, , , , address operator) = INodeRegistry(nodeRegistry).operatorStructById(operatorId);
        return operator;
    }

    function onlyValidatorWithdrawVault(
        uint8 _poolId,
        uint256 _validatorId,
        address _addr,
        IStaderConfig _staderConfig
    ) internal view {
        address nodeRegistry = IPoolUtils(_staderConfig.getPoolUtils()).getNodeRegistry(_poolId);
        (, , , , address withdrawVaultAddress, , , ) = INodeRegistry(nodeRegistry).validatorRegistry(_validatorId);
        if (_addr != withdrawVaultAddress) {
            revert CallerNotWithdrawVault();
        }
    }

    function getOperatorAddressByValidatorId(
        uint8 _poolId,
        uint256 _validatorId,
        IStaderConfig _staderConfig
    ) internal view returns (address) {
        address nodeRegistry = IPoolUtils(_staderConfig.getPoolUtils()).getNodeRegistry(_poolId);
        (, , , , , uint256 operatorId, , ) = INodeRegistry(nodeRegistry).validatorRegistry(_validatorId);
        (, , , , address operatorAddress) = INodeRegistry(nodeRegistry).operatorStructById(operatorId);

        return operatorAddress;
    }

    function getOperatorAddressByOperatorId(
        uint8 _poolId,
        uint256 _operatorId,
        IStaderConfig _staderConfig
    ) internal view returns (address) {
        address nodeRegistry = IPoolUtils(_staderConfig.getPoolUtils()).getNodeRegistry(_poolId);
        (, , , , address operatorAddress) = INodeRegistry(nodeRegistry).operatorStructById(_operatorId);

        return operatorAddress;
    }

    function getOperatorRewardAddress(address _operator, IStaderConfig _staderConfig)
        internal
        view
        returns (address payable)
    {
        uint8 poolId = IPoolUtils(_staderConfig.getPoolUtils()).getOperatorPoolId(_operator);
        address nodeRegistry = IPoolUtils(_staderConfig.getPoolUtils()).getNodeRegistry(poolId);
        uint256 operatorId = INodeRegistry(nodeRegistry).operatorIDByAddress(_operator);
        return INodeRegistry(nodeRegistry).getOperatorRewardAddress(operatorId);
    }

    /**
     * @notice Computes the public key root.
     * @param _pubkey The validator public key for which to compute the root.
     * @return The root of the public key.
     */
    function getPubkeyRoot(bytes calldata _pubkey) internal pure returns (bytes32) {
        if (_pubkey.length != VALIDATOR_PUBKEY_LENGTH) {
            revert InvalidPubkeyLength();
        }

        // Append 16 bytes of zero padding to the pubkey and compute its hash to get the pubkey root.
        return sha256(abi.encodePacked(_pubkey, bytes16(0)));
    }

    function getValidatorSettleStatus(bytes calldata _pubkey, IStaderConfig _staderConfig)
        internal
        view
        returns (bool)
    {
        uint8 poolId = IPoolUtils(_staderConfig.getPoolUtils()).getValidatorPoolId(_pubkey);
        address nodeRegistry = IPoolUtils(_staderConfig.getPoolUtils()).getNodeRegistry(poolId);
        uint256 validatorId = INodeRegistry(nodeRegistry).validatorIdByPubkey(_pubkey);
        (, , , , address withdrawVaultAddress, , , ) = INodeRegistry(nodeRegistry).validatorRegistry(validatorId);
        return IVaultProxy(withdrawVaultAddress).vaultSettleStatus();
    }

    function computeExchangeRate(
        uint256 totalETHBalance,
        uint256 totalETHXSupply,
        IStaderConfig _staderConfig
    ) internal view returns (uint256) {
        uint256 DECIMALS = _staderConfig.getDecimals();
        uint256 newExchangeRate = (totalETHBalance == 0 || totalETHXSupply == 0)
            ? DECIMALS
            : (totalETHBalance * DECIMALS) / totalETHXSupply;
        return newExchangeRate;
    }

    function sendValue(address _receiver, uint256 _amount) internal {
        (bool success, ) = payable(_receiver).call{value: _amount}('');
        if (!success) {
            revert TransferFailed();
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.16;

enum ValidatorStatus {
    INITIALIZED,
    INVALID_SIGNATURE,
    FRONT_RUN,
    PRE_DEPOSIT,
    DEPOSITED,
    WITHDRAWN
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/"
  ],
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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