// File: contracts/IDO/ReduxIdo.sol



// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.9;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./IPool.sol";
import "./Pool.sol";
import "./Validations.sol";

interface IStake {
    struct UserData {
        uint256 stakeToken;
        uint256 rewards;
        uint256 lastUpdateTime;
        uint256 stakingTime;
    }

    function users(address user) external view returns (UserData memory);
}

contract ReduxIdo is Pausable, Ownable {
    using SafeERC20 for IERC20;
    IPool private pool;
    address public stakingContract;

    event LogPoolCreated(address indexed poolOwner);
    event LogPoolStatusChanged(address indexed poolOwner, uint256 newStatus);
    event LogWithdraw(address indexed participant, uint256 amount);

    constructor(address _stakingContract) {
        require(
            address(0) != address(_stakingContract),
            "zero address not accepted!"
        );
        stakingContract = _stakingContract;
    }

    function createPool(
        uint256 _hardCap,
        uint256 _startDateTime,
        uint256 _endDateTime,
        uint256 _status
    ) external onlyOwner _createPoolOnlyOnce returns (bool success) {
        IPool.PoolModel memory model = IPool.PoolModel({
            hardCap: _hardCap,
            startDateTime: _startDateTime,
            endDateTime: _endDateTime,
            status: IPool.PoolStatus(_status)
        });

        pool = new Pool(model);
        emit LogPoolCreated(_msgSender());
        success = true;
    }

    function addIDOInfo(
        address _investmentTokenAddress,
        uint256 _minAllocationPerUser,
        uint256 _maxAllocationPerUser
    ) external onlyOwner {
        pool.addIDOInfo(
            IPool.IDOInfo({
                investmentTokenAddress: _investmentTokenAddress,
                minAllocationPerUser: _minAllocationPerUser,
                maxAllocationPerUser: _maxAllocationPerUser
            })
        );
    }

    function updatePoolStatus(uint256 newStatus)
        external
        onlyOwner
        returns (bool success)
    {
        pool.updatePoolStatus(newStatus);
        emit LogPoolStatusChanged(_msgSender(), newStatus);
        success = true;
    }

    function getCompletePoolDetails()
        external
        view
        _poolIsCreated
        returns (IPool.CompletePoolDetails memory poolDetails)
    {
        poolDetails = pool.getCompletePoolDetails();
    }

    // Whitelisted accounts can invest in the Pool
    function participate(uint256 amount) external {
        require(
            IStake(stakingContract).users(msg.sender).stakeToken >= 500 ether,
            "User not staked required amount"
        );
        pool.deposit(msg.sender, amount);
    }

    function poolAddress() external view returns (address _pool) {
        _pool = address(pool);
    }

    function withdrawFunds(address fundsWallet) public onlyOwner {
        address investmentTokenAddress = pool.getInvestmentTokenAddress();
        uint256 totalRaisedAmount = IERC20(investmentTokenAddress).balanceOf(
            address(this)
        );
        require(totalRaisedAmount > 0, "Raised funds should be greater than 0");
        IERC20(investmentTokenAddress).safeTransfer(
            fundsWallet,
            totalRaisedAmount
        );
    }

    modifier _createPoolOnlyOnce() {
        require(address(pool) == address(0), "Pool already created!");
        _;
    }

    modifier _poolIsCreated() {
        require(address(pool) != address(0), "Pool not created yet!");
        _;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

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

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

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

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

// File: @openzeppelin/contracts/security/Pausable.sol



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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev 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());
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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 IERC20 {
    /**
     * @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);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: contracts/IDO/IPool.sol



// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.9;

interface IPool {
    struct PoolModel {
        uint256 hardCap; // how much project wants to raise
        uint256 startDateTime;
        uint256 endDateTime;
        PoolStatus status; //: by default “Upcoming”,
    }

    struct IDOInfo {
        address investmentTokenAddress; //the address of the token in which project will raise funds
        uint256 minAllocationPerUser;
        uint256 maxAllocationPerUser;
    }

    // Pool data that needs to be retrieved:
    struct CompletePoolDetails {
        Participations participationDetails;
        PoolModel pool;
        IDOInfo poolDetails;
        uint256 totalRaised;
    }

    struct Participations {
        ParticipantDetails[] investorsDetails;
        uint256 count;
    }

    struct ParticipantDetails {
        address addressOfParticipant;
        uint256 totalRaisedAmount;
    }

    enum PoolStatus {
        Upcoming,
        Ongoing,
        Finished,
        Paused,
        Cancelled
    }

    function addIDOInfo(IDOInfo memory _detailedPoolInfo) external;

    function getCompletePoolDetails()
        external
        view
        returns (CompletePoolDetails memory poolDetails);

    function getInvestmentTokenAddress()
        external
        view
        returns (address investmentTokenAddress);

    function updatePoolStatus(uint256 _newStatus) external;

    function deposit(address _sender, uint256 _amount) external;
}

// File: contracts/IDO/Pool.sol



// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.9;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./IPool.sol";
import "./Validations.sol";

contract Pool is IPool, Ownable {
    using SafeERC20 for IERC20;
    PoolModel private poolInformation;
    IDOInfo private idoInfo;

    address[] private participantsAddress;
    mapping(address => uint256) private collaborations;
    uint256 private _amountRaised = 0;

    event LogPoolContractAddress(address);
    event LogPoolStatusChanged(uint256 currentStatus, uint256 newStatus);
    event LogDeposit(address indexed participant, uint256 amount);

    constructor(PoolModel memory _pool) {
        _preValidatePoolCreation(_pool);
        poolInformation = IPool.PoolModel({
            hardCap: _pool.hardCap, // 100k
            startDateTime: _pool.startDateTime,
            endDateTime: _pool.endDateTime,
            status: _pool.status
        });

        emit LogPoolContractAddress(address(this));
    }

    modifier _addIDOInfoOnlyOnce() {
        require(
            address(idoInfo.investmentTokenAddress) == address(0),
            "already added IDO info"
        );
        _;
    }

    function addIDOInfo(IDOInfo memory _pdi)
        external
        override
        onlyOwner
        _addIDOInfoOnlyOnce
    {
        _preIDOInfoUpdate(_pdi);

        idoInfo.investmentTokenAddress = _pdi.investmentTokenAddress;
        idoInfo.minAllocationPerUser = _pdi.minAllocationPerUser;
        idoInfo.maxAllocationPerUser = _pdi.maxAllocationPerUser;
    }

    receive() external payable {
    }

    function deposit(address _sender, uint256 _amount)
        external
        override
        onlyOwner
        _pooIsOngoing(poolInformation)
        _hardCapNotPassed(poolInformation.hardCap, _amount)
        _isAmountStaisfyAllocationRange(_amount)
    {
        IERC20(idoInfo.investmentTokenAddress).safeTransferFrom( _sender,
            msg.sender,
            _amount);

        _increaseRaisedAmount(_amount);
        _addToParticipants(_sender, _amount);
        emit LogDeposit(_sender, _amount);
    }

    function updatePoolStatus(uint256 _newStatus) external override onlyOwner {
        require(_newStatus < 5 && _newStatus >= 0, "wrong Status;");
        uint256 currentStatus = uint256(poolInformation.status);
        poolInformation.status = PoolStatus(_newStatus);
        emit LogPoolStatusChanged(currentStatus, _newStatus);
    }

    function getCompletePoolDetails()
        external
        view
        override
        returns (CompletePoolDetails memory poolDetails)
    {
        poolDetails = CompletePoolDetails({
            participationDetails: _getParticipantsInfo(),
            totalRaised: _getTotalRaised(),
            pool: poolInformation,
            poolDetails: idoInfo
        });
    }

    function getInvestmentTokenAddress()
        external
        view
        override
        returns (address investmentTokenAddress)
    {
        return idoInfo.investmentTokenAddress;
    }

    // remove

    function _getParticipantsInfo()
        private
        view
        returns (Participations memory participants)
    {
        uint256 count = participantsAddress.length;

        ParticipantDetails[] memory parts = new ParticipantDetails[](count);

        for (uint256 i = 0; i < count; i++) {
            address userAddress = participantsAddress[i];
            parts[i] = ParticipantDetails(
                userAddress,
                collaborations[userAddress]
            );
        }
        participants.count = count;
        participants.investorsDetails = parts;
    }

    function _getTotalRaised() private view returns (uint256 amount) {
        amount = _amountRaised;
    }

    function _increaseRaisedAmount(uint256 _amount) private {
        require(_amount > 0, "No amount found!");
        _amountRaised += _amount;
    }

    function _addToParticipants(address _address, uint256 amount) private {
        require(!_didAlreadyParticipated(_address), "Already participated");
        _addToListOfParticipants(_address);
        _keepRecordOfAmountRaised(_address, amount);
    }

    function _didAlreadyParticipated(address _address)
        private
        view
        returns (bool isIt)
    {
        isIt = collaborations[_address] > 0;
    }

    function _addToListOfParticipants(address _address) private {
        participantsAddress.push(_address);
    }

    function _keepRecordOfAmountRaised(address _address, uint256 amount)
        private
    {
        collaborations[_address] += amount;
    }

    function _preValidatePoolCreation(IPool.PoolModel memory _pool)
        private
        view
    {
        require(_pool.hardCap > 0, "hardCap must be > 0");
        require(
            _pool.startDateTime > block.timestamp,
            "startDateTime must be > now"
        );
    }

    function _preIDOInfoUpdate(IDOInfo memory _idoInfo) private pure {
        require(
            address(_idoInfo.investmentTokenAddress) != address(0),
            "investmentTokenAddress is a zero address!"
        );
        require(
            _idoInfo.minAllocationPerUser > 0,
            "minAllocation must be > 0!"
        );
        require(
            _idoInfo.minAllocationPerUser < _idoInfo.maxAllocationPerUser,
            "minAllocation must be < max!"
        );
    }

    modifier _pooIsOngoing(IPool.PoolModel storage _pool) {
        require(_pool.status == IPool.PoolStatus.Ongoing, "Pool not open!");
        require(
            _pool.startDateTime <= block.timestamp,
            "Pool not started yet!"
        );
        require(_pool.endDateTime >= block.timestamp, "pool endDate passed!");

        _;
    }

    modifier _isPoolFinished(IPool.PoolModel storage _pool) {
        require(
            _pool.status == IPool.PoolStatus.Finished,
            "Pool status not Finished!"
        );
        _;
    }

    modifier _isAmountStaisfyAllocationRange(uint256 amount) {
        require(
            amount >= idoInfo.minAllocationPerUser &&
                amount <= idoInfo.maxAllocationPerUser,
            "Amount out of allocation range"
        ); // deposit between 500 USDT and 1000 USDT */
        _;
    }

    modifier _hardCapNotPassed(uint256 _hardCap, uint256 amount) {
        uint256 _beforeBalance = _getTotalRaised();

        uint256 sum = _getTotalRaised() + amount;
        require(sum <= _hardCap, "hardCap reached!");
        assert(sum > _beforeBalance);
        _;
    }
}

// File: contracts/IDO/Validations.sol



// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.9;

library Validations {
    function revertOnZeroAddress(address _address) internal pure {
        require(address(0) != address(_address), "zero address not accepted!");
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

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

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

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-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 IERC20Permit {
    /**
     * @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);
}

// File: @openzeppelin/contracts/utils/Address.sol



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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [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 functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}