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// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "@openzeppelin/contracts-upgradeable/access/Ownable2StepUpgradeable.sol";

import "./library/PauseGuardian.sol";
import "./library/Manable.sol";

import "./interface/ICore.sol";
import "./interface/IaETH.sol";

/**
 * @title Aspida's ETH 2.0 staking reward oracle
 * @dev This contract serves as a reward oracle for ETH 2.0 staking. It calculates and updates the epoch reward based on various parameters.
 * @author Aspida engineer
 */
contract RewardOracle is Ownable2StepUpgradeable, PauseGuardian, Manable {
    uint256 internal constant BASE = 1e18;
    uint256 internal constant SECONDS_PER_SLOT = 12 seconds;
    uint256 internal constant SLOT_PER_EPOCH = 32;
    uint256 internal constant SECONDS_PER_EPOCH = SECONDS_PER_SLOT * SLOT_PER_EPOCH;
    uint256 internal constant EPOCH_PER_YEAR = 365 days / SECONDS_PER_EPOCH;
    uint256 internal constant EPOCH_INTEREST_RATE_MAX = BASE / EPOCH_PER_YEAR;

    uint256 internal constant DEPOSIT_SIZE = 32 ether; // The deposit size for validators

    ICore internal immutable CORE; // The interface for the core contract

    uint256 internal immutable ZERO_EPOCH_TIMESTAMP; // The timestamp of the zero epoch

    uint256 internal interestRateLimitPerEpoch_; // The interest rate limit per epoch
    uint256 internal validatorLimitPerEpoch_; // The validator limit per epoch

    uint256 internal lastEpochId_; // The last epoch ID
    uint256 internal lastActivatedValidatorCount_; // The last activated validator count

    /**
     * @dev Emitted when the interest rate limit per epoch is set
     */
    event SetInterestRateLimitPerEpoch(uint256 interestRateLimitPerEpoch);

    /**
     * @dev Emitted when the validator limit per epoch is set
     */
    event SetValidatorLimitPerEpoch(uint256 validatorLimitPerEpoch);

    /**
     * @dev Emitted when the epoch reward is updated
     */
    event UpdateEpochReward(
        uint256 lastEpochId,
        uint256 submitEpochId,
        uint256 lastActivatedValidatorCount,
        uint256 activatedValidatorCount,
        uint256 rewardIncrement
    );

    /**
     * @notice Only for the implementation contract, as for the proxy pattern,
     *            should call `initialize()` separately.
     * @param _core The interface for the core contract
     */
    constructor(ICore _core, uint256 _zeroEpochTimestamp) {
        CORE = _core;
        ZERO_EPOCH_TIMESTAMP = _zeroEpochTimestamp;
        _disableInitializers();
    }

    /**
     * @notice Expects to call only once to initialize RewardOracle.
     */
    function initialize() public initializer {
        __Ownable2Step_init();
        _setInterestRateLimitPerEpoch(BASE);
        lastEpochId_ = _currentEpochId();
    }

    /**
     * @dev Unpause when RewardOracle is paused.
     */
    function _open() external onlyOwner {
        _unpause();
    }

    /**
     * @dev Pause RewardOracle.
     */
    function _close() external onlyPauseGuardian {
        _pause();
    }

    /**
     * @notice Add `_pauseGuardian` into pause guardians.
     * @param _pauseGuardian The address of the pause guardian to add
     */
    function _addPauseGuardian(address _pauseGuardian) external onlyOwner {
        _addPauseGuardianInternal(_pauseGuardian);
    }

    /**
     * @notice Remove `_pauseGuardian` from pause guardians.
     * @param _pauseGuardian The address of the pause guardian to remove
     */
    function _removePauseGuardian(address _pauseGuardian) external onlyOwner {
        _removePauseGuardianInternal(_pauseGuardian);
    }

    /**
     * @notice Add `_manager` into managers.
     * If `_manager` have not been a manager, emits a `ManagerAdded` event.
     *
     * @param _manager The manager to add
     *
     * Requirements:
     * - the caller must be `owner`.
     */
    function _addManager(address _manager) external onlyOwner {
        _addManagerInternal(_manager);
    }

    /**
     * @notice Remove `_manager` from managers.
     * If `_manager` is a manager, emits a `ManagerRemoved` event.
     *
     * @param _manager The manager to remove
     *
     * Requirements:
     * - the caller must be `owner`.
     */
    function _removeManager(address _manager) external onlyOwner {
        _removeManagerInternal(_manager);
    }

    /**
     * @notice Set the interest rate limit per epoch.
     * @param _annualInterestRate The annual interest rate
     *
     * Requirements:
     * - the caller must be `owner`.
     * - the interest rate must not be too large.
     * - the interest rate cannot be set to the same value.
     */
    function _setInterestRateLimitPerEpoch(uint256 _annualInterestRate) public onlyOwner {
        uint256 _interestRateLimitPerEpoch = _annualInterestRate / EPOCH_PER_YEAR;
        require(
            _interestRateLimitPerEpoch <= EPOCH_INTEREST_RATE_MAX,
            "_setInterestRateLimitPerEpoch: Interest rate too large"
        );
        require(
            _interestRateLimitPerEpoch != interestRateLimitPerEpoch_,
            "_setInterestRateLimitPerEpoch: Cannot set the same value"
        );
        interestRateLimitPerEpoch_ = _interestRateLimitPerEpoch;
        emit SetInterestRateLimitPerEpoch(_interestRateLimitPerEpoch);
    }

    /**
     * @notice Set the validator limit per epoch.
     * @param _validatorLimitPerEpoch The validator limit per epoch
     *
     * Requirements:
     * - the caller must be `owner`.
     * - the validator limit cannot be set to the same value.
     */
    function _setValidatorLimitPerEpoch(uint256 _validatorLimitPerEpoch) public onlyOwner {
        require(
            _validatorLimitPerEpoch != validatorLimitPerEpoch_,
            "_setValidatorLimitPerEpoch: Cannot set the same value"
        );
        validatorLimitPerEpoch_ = _validatorLimitPerEpoch;
        emit SetValidatorLimitPerEpoch(_validatorLimitPerEpoch);
    }

    /**
     * @notice Calculate the current epoch ID.
     * @return The current epoch ID.
     */
    function _currentEpochId() internal view returns (uint256) {
        // Calculate the current epoch ID based on the current block timestamp and the timestamp of the zero epoch
        return (block.timestamp - ZERO_EPOCH_TIMESTAMP) / SECONDS_PER_EPOCH;
    }

    /**
     * @notice Calculate the epoch interest rate.
     * @param _epochCount The number of epochs
     * @param _activatedValidatorCount The number of activated validators
     * @param _rewardIncrement The reward increment
     * @return The epoch interest rate
     */
    function _calculateEpochInterestRate(
        uint256 _epochCount,
        uint256 _activatedValidatorCount,
        uint256 _rewardIncrement
    ) internal pure returns (uint256) {
        uint256 _principal = _epochCount * _activatedValidatorCount * DEPOSIT_SIZE;
        return (_rewardIncrement * BASE + _principal - 1) / _principal;
    }

    /**
     * @notice Update the epoch reward.
     * @param _startEpochId The starting epoch ID
     * @param _epochId The current epoch ID
     * @param _activatedValidatorCount The number of activated validators
     * @param _rewardIncrement The reward increment
     *
     * Requirements:
     * - the active validators must not be 0.
     * - the epoch ID must increase.
     * - the epoch interest rate must be valid.
     * - the validator limit must not be exceeded.
     */
    function _updateEpochReward(
        uint256 _startEpochId,
        uint256 _epochId,
        uint256 _activatedValidatorCount,
        uint256 _rewardIncrement
    ) internal {
        require(_activatedValidatorCount > 0, "_updateEpochReward: Active validators must not be 0");
        require(_epochId <= _currentEpochId(), "_updateEpochReward: Invalid epoch id");

        uint256 _lastEpochId = lastEpochId_;
        require(_startEpochId == _lastEpochId, "_updateEpochReward: Start epoch id must equal last epoch id");
        require(_epochId > _lastEpochId, "_updateEpochReward: Epoch id must increase");

        uint256 _epochCount = _epochId - _lastEpochId;
        uint256 _epochInterestRate = _calculateEpochInterestRate(
            _epochCount,
            _activatedValidatorCount,
            _rewardIncrement
        );
        require(_epochInterestRate <= interestRateLimitPerEpoch_, "_updateEpochReward: Invalid epoch interest rate");

        uint256 _lastActivatedValidatorCount = lastActivatedValidatorCount_;
        if (_activatedValidatorCount > _lastActivatedValidatorCount) {
            require(
                (_activatedValidatorCount - _lastActivatedValidatorCount + _epochCount - 1) / _epochCount <=
                    validatorLimitPerEpoch_,
                "_updateEpochReward: Validator out of increment per epoch"
            );
        }

        lastEpochId_ = _epochId;
        lastActivatedValidatorCount_ = _activatedValidatorCount;
        emit UpdateEpochReward(
            _lastEpochId,
            _epochId,
            _lastActivatedValidatorCount,
            _activatedValidatorCount,
            _rewardIncrement
        );
    }

    /**
     * @notice Submit the epoch reward.
     * @param _startEpochId The starting epoch ID
     * @param _epochId The current epoch ID
     * @param _activatedValidatorCount The number of activated validators
     * @param _rewardIncrement The reward increment
     *
     * Requirements:
     * - the function caller must be the `manager`.
     * - the contract must not be paused.
     */
    function submitEpochReward(
        uint256 _startEpochId,
        uint256 _epochId,
        uint256 _activatedValidatorCount,
        uint256 _rewardIncrement
    ) external whenNotPaused onlyManager {
        _updateEpochReward(_startEpochId, _epochId, _activatedValidatorCount, _rewardIncrement);
        CORE.supplyReward(_rewardIncrement);
    }

    /**
     * @notice Get the CORE contract.
     * @return The CORE contract.
     */
    function core() external view returns (ICore) {
        return CORE;
    }

    /**
     * @notice Get the zero epoch timestamp.
     * @return The zero epoch timestamp.
     */
    function zeroEpochTimestamp() external view returns (uint256) {
        return ZERO_EPOCH_TIMESTAMP;
    }

    /**
     * @notice Get the interest rate limit per epoch.
     * @return The interest rate limit per epoch.
     */
    function interestRateLimitPerEpoch() external view returns (uint256) {
        return interestRateLimitPerEpoch_;
    }

    /**
     * @notice Get the validator limit per epoch.
     * @return The validator limit per epoch.
     */
    function validatorLimitPerEpoch() external view returns (uint256) {
        return validatorLimitPerEpoch_;
    }

    /**
     * @notice Get the last epoch ID.
     * @return The last epoch ID.
     */
    function lastEpochId() external view returns (uint256) {
        return lastEpochId_;
    }

    /**
     * @notice Get the last activated validator count.
     * @return The last activated validator count.
     */
    function lastActivatedValidatorCount() external view returns (uint256) {
        return lastActivatedValidatorCount_;
    }

    /**
     * @notice Get the current epoch ID.
     * @return The current epoch ID.
     */
    function currentEpochId() external view returns (uint256) {
        return _currentEpochId();
    }

    /**
     * @notice Check if an address is a pause guardian.
     * @param _pauseGuardian The address to check.
     * @return True if the address is a pause guardian or the owner, false otherwise.
     */
    function isPauseGuardian(address _pauseGuardian) public view override returns (bool) {
        return PauseGuardian.isPauseGuardian(_pauseGuardian) || _pauseGuardian == owner();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./OwnableUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2StepUpgradeable is Initializable, OwnableUpgradeable {
    function __Ownable2Step_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable2Step_init_unchained() internal onlyInitializing {
    }
    address private _pendingOwner;

    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }

    /**
     * @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 v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

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

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

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

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

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

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

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

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

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

// EIP-2612 is Final as of 2022-11-01. This file is deprecated.

import "./IERC20PermitUpgradeable.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/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/v0.8.0/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 Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-IERC20PermitUpgradeable.sol";

interface IaETH is IERC20Upgradeable, IERC20PermitUpgradeable {
    function mint(address _receiver, uint256 _amount) external;

    function burn(uint256 _amount) external;

    function burnFrom(address _account, uint256 _amount) external;

    function minterMint(address _receiver, uint256 _amount) external;

    function minterBurn(uint256 _amount) external;

    function mintCap(address _minter) external view returns (uint256);

    function mintAmount(address _minter) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface ICore {
    function receiveStrategyEarning() external payable;

    function supplyReward(uint256 _amount) external;

    function aETH() external view returns (address);

    function treasury() external view returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

/**
 * @title Aspida's manager module
 * @author Aspida engineer
 */
abstract contract Manable {
    using EnumerableSet for EnumerableSet.AddressSet;

    /// @dev EnumerableSet of managers
    EnumerableSet.AddressSet internal managers_;

    /**
     * @dev Emitted when `manager` is added as `managers`.
     */
    event ManagerAdded(address manager);

    /**
     * @dev Emitted when `manager` is removed from `managers`.
     */
    event ManagerRemoved(address manager);

    /**
     * @dev Throws if called by any account other than the managers.
     */
    modifier onlyManager() {
        require(managers_.contains(msg.sender), "onlyManager: caller is not manager");
        _;
    }

    /**
     * @notice Add `manager` into managers.
     * If `manager` have not been a manager, emits a `ManagerAdded` event.
     *
     * @param _manager The manager to add
     */
    function _addManagerInternal(address _manager) internal virtual {
        require(_manager != address(0), "_addManagerInternal: _manager the zero address");
        require(managers_.add(_manager), "_addManagerInternal: _manager has been added");
        emit ManagerAdded(_manager);
    }

    /**
     * @notice Remove `manager` from managers.
     * If `manager` is a manager, emits a `ManagerRemoved` event.
     *
     * @param _manager The manager to remove
     */
    function _removeManagerInternal(address _manager) internal virtual {
        require(managers_.remove(_manager), "_removeManagerInternal: _manager has been removed");
        emit ManagerRemoved(_manager);
    }

    /**
     * @notice Return all managers
     * @return _managers The list of manager addresses
     */
    function managers() public view returns (address[] memory _managers) {
        _managers = managers_.values();
    }

    /**
     * @dev Check if address is manager
     * @param _manager The address to check
     * @return Is manager boolean, true: is the manager; false: not the manager
     */
    function isManager(address _manager) public view returns (bool) {
        return managers_.contains(_manager);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

/**
 * @title Aspida's PauseGuardian module
 * @author Aspida engineer
 */
abstract contract PauseGuardian is PausableUpgradeable {
    using EnumerableSet for EnumerableSet.AddressSet;

    /// @dev EnumerableSet of pauseGuardians
    EnumerableSet.AddressSet internal pauseGuardians_;

    /**
     * @dev Emitted when `pauseGuardian` is added as `pauseGuardian`.
     */
    event PauseGuardianAdded(address pauseGuardian);

    /**
     * @dev Emitted when `pauseGuardian` is removed from `pauseGuardians`.
     */
    event PauseGuardianRemoved(address pauseGuardian);

    /**
     * @dev Throws if called by any account other than pauseGuardian.
     */
    modifier onlyPauseGuardian() {
        require(isPauseGuardian(msg.sender), "onlyPauseGuardian: caller is not pauseGuardian");
        _;
    }

    /**
     * @notice Add `pauseGuardian` into pauseGuardians.
     * If `pauseGuardian` have not been a pauseGuardian, emits a `PauseGuardianAdded` event.
     *
     * @param _pauseGuardian The pauseGuardian to add
     */
    function _addPauseGuardianInternal(address _pauseGuardian) internal virtual {
        require(_pauseGuardian != address(0), "_addPauseGuardianInternal: _pauseGuardian the zero address");
        require(pauseGuardians_.add(_pauseGuardian), "_addPauseGuardianInternal: _pauseGuardian has been added");
        emit PauseGuardianAdded(_pauseGuardian);
    }

    /**
     * @notice Remove `pauseGuardian` from pauseGuardians.
     * If `pauseGuardian` is a pauseGuardian, emits a `PauseGuardianRemoved` event.
     *
     * @param _pauseGuardian The pauseGuardian to remove
     */
    function _removePauseGuardianInternal(address _pauseGuardian) internal virtual {
        require(
            pauseGuardians_.remove(_pauseGuardian),
            "_removePauseGuardianInternal: _pauseGuardian has been removed"
        );
        emit PauseGuardianRemoved(_pauseGuardian);
    }

    /**
     * @notice Return all pauseGuardians
     * @return _pauseGuardians The list of pauseGuardian addresses
     */
    function pauseGuardians() public view returns (address[] memory _pauseGuardians) {
        _pauseGuardians = pauseGuardians_.values();
    }

    /**
     * @dev Check if address is pauseGuardian
     * @param _pauseGuardian The address to check
     * @return Is pauseGuardian boolean, true: is the pauseGuardian; false: not the pauseGuardian
     */
    function isPauseGuardian(address _pauseGuardian) public view virtual returns (bool) {
        return pauseGuardians_.contains(_pauseGuardian);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000005341864d99b50155f782c562bd15ac4a0a3c117e000000000000000000000000000000000000000000000000000000005fc63057

-----Decoded View---------------
Arg [0] : _core (address): 0x5341864D99B50155F782C562Bd15Ac4a0A3C117e
Arg [1] : _zeroEpochTimestamp (uint256): 1606824023

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000005341864d99b50155f782c562bd15ac4a0a3c117e
Arg [1] : 000000000000000000000000000000000000000000000000000000005fc63057