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// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.13;

import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

import {IRetro} from "./interfaces/IRetro.sol";
import {IVotingEscrow} from "./interfaces/IVotingEscrow.sol";
import {IUniswapV3Twap} from "./interfaces/IUniswapV3Twap.sol";
import {IOptionFeeDistributor} from "./interfaces/IOptionFeeDistributor.sol";

/// @title Option Token
/// @notice Option token representing the right to purchase the underlying token
/// at TWAP reduced rate. Similar to call options but with a variable strike
/// price that's always at a certain discount to the market price.
/// @dev Assumes the underlying token and the payment token both use 18 decimals and revert on
// failure to transfer.

contract OptionTokenV2 is ERC20, AccessControl {
    /// -----------------------------------------------------------------------
    /// Constants
    /// -----------------------------------------------------------------------
    uint256 public constant MAX_DISCOUNT = 100; // 100%
    uint256 public constant MIN_DISCOUNT = 0; // 0%
    uint256 public constant MAX_TWAP_SECONDS = 86400; // 2 days
    uint256 public constant FULL_LOCK = 2 * 365 * 86400; // 2 years

    /// -----------------------------------------------------------------------
    /// Roles
    /// -----------------------------------------------------------------------
    /// @dev The identifier of the role which maintains other roles and settings
    bytes32 public constant ADMIN_ROLE = keccak256("ADMIN");

    /// @dev The identifier of the role which is allowed to mint options token
    bytes32 public constant MINTER_ROLE = keccak256("MINTER");

    /// @dev The identifier of the role which allows accounts to pause execrcising options
    /// in case of emergency
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER");

    /// -----------------------------------------------------------------------
    /// Errors
    /// -----------------------------------------------------------------------
    error OptionToken_PastDeadline();
    error OptionToken_NoAdminRole();
    error OptionToken_NoMinterRole();
    error OptionToken_NoPauserRole();
    error OptionToken_SlippageTooHigh();
    error OptionToken_InvalidDiscount();
    error OptionToken_Paused();
    error OptionToken_InvalidTwapSeconds();
    error OptionToken_IncorrectPairToken();

    /// -----------------------------------------------------------------------
    /// Events
    /// -----------------------------------------------------------------------

    event Exercise(
        address indexed sender,
        address indexed recipient,
        uint256 amount,
        uint256 paymentAmount
    );
    event ExerciseVe(
        address indexed sender,
        address indexed recipient,
        uint256 amount,
        uint256 paymentAmount,
        uint256 nftId
    );
    event SetTwapOracleAndPaymentToken(
        IUniswapV3Twap indexed _twapOracle,
        address indexed _paymentToken
    );
    event SetFeeDistributor(IOptionFeeDistributor indexed newFeeDistributor);
    event SetDiscount(uint256 discount);
    event SetVeDiscount(uint256 veDiscount);
    event PauseStateChanged(bool isPaused);
    event SetTwapSeconds(uint32 twapSeconds);

    /// -----------------------------------------------------------------------
    /// Immutable parameters
    /// -----------------------------------------------------------------------

    /// @notice The token paid by the options token holder during redemption
    ERC20 public paymentToken;

    /// @notice The underlying token purchased during redemption
    ERC20 public immutable underlyingToken;

    /// @notice The voting escrow for locking FLOW to veFLOR
    address public votingEscrow;

    /// -----------------------------------------------------------------------
    /// Storage variables
    /// -----------------------------------------------------------------------

    /// @notice The oracle contract that provides the current TWAP price to purchase
    /// the underlying token while exercising options (the strike price)
    IUniswapV3Twap public twapOracle;

    /// @notice The contract that receives the payment tokens when options are exercised
    IOptionFeeDistributor public feeDistributor;

    /// @notice the discount given during exercising. 30 = user pays 30%
    uint256 public discount;

    /// @notice the further discount for locking to veFLOW
    uint256 public veDiscount;

    /// @notice controls the duration of the twap used to calculate the strike price
    // each point represents 30 minutes. 4 points = 2 hours
    uint32 public twapSeconds = 60 * 30 * 4;

    /// @notice Is excersizing options currently paused
    bool public isPaused;

    /// -----------------------------------------------------------------------
    /// Modifiers
    /// -----------------------------------------------------------------------
    /// @dev A modifier which checks that the caller has the admin role.
    modifier onlyAdmin() {
        if (!hasRole(ADMIN_ROLE, msg.sender)) revert OptionToken_NoAdminRole();
        _;
    }

    /// @dev A modifier which checks that the caller has the admin role.
    modifier onlyMinter() {
        if (
            !hasRole(ADMIN_ROLE, msg.sender) &&
            !hasRole(MINTER_ROLE, msg.sender)
        ) revert OptionToken_NoMinterRole();
        _;
    }

    /// @dev A modifier which checks that the caller has the pause role.
    modifier onlyPauser() {
        if (!hasRole(PAUSER_ROLE, msg.sender))
            revert OptionToken_NoPauserRole();
        _;
    }

    /// -----------------------------------------------------------------------
    /// Constructor
    /// -----------------------------------------------------------------------

    constructor(
        string memory _name,
        string memory _symbol,
        address _admin,
        ERC20 _paymentToken,
        ERC20 _underlyingToken,
        IUniswapV3Twap _twapOracle,
        IOptionFeeDistributor _feeDistributor,
        uint256 _discount,
        uint256 _veDiscount,
        address _votingEscrow
    ) ERC20(_name, _symbol) {
        _grantRole(ADMIN_ROLE, _admin);
        _grantRole(PAUSER_ROLE, _admin);
        _setRoleAdmin(ADMIN_ROLE, ADMIN_ROLE);
        _setRoleAdmin(MINTER_ROLE, ADMIN_ROLE);
        _setRoleAdmin(PAUSER_ROLE, ADMIN_ROLE);

        paymentToken = _paymentToken;
        underlyingToken = _underlyingToken;
        twapOracle = _twapOracle;
        feeDistributor = _feeDistributor;
        discount = _discount;
        veDiscount = _veDiscount;
        votingEscrow = _votingEscrow;

        paymentToken.approve(address(_feeDistributor), type(uint256).max);

        emit SetTwapOracleAndPaymentToken(_twapOracle, address(_paymentToken));
        emit SetFeeDistributor(_feeDistributor);
        emit SetDiscount(_discount);
        emit SetVeDiscount(_veDiscount);
    }

    /// -----------------------------------------------------------------------
    /// External functions
    /// -----------------------------------------------------------------------

    /// @notice Exercises options tokens to purchase the underlying tokens.
    /// @dev The oracle may revert if it cannot give a secure result.
    /// @param _amount The amount of options tokens to exercise
    /// @param _maxPaymentAmount The maximum acceptable amount to pay. Used for slippage protection.
    /// @param _recipient The recipient of the purchased underlying tokens
    /// @return The amount paid to the fee distributor to purchase the underlying tokens
    function exercise(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        address _recipient
    ) external returns (uint256) {
        return _exercise(_amount, _maxPaymentAmount, _recipient);
    }

    /// @notice Exercises options tokens to purchase the underlying tokens.
    /// @dev The oracle may revert if it cannot give a secure result.
    /// @param _amount The amount of options tokens to exercise
    /// @param _maxPaymentAmount The maximum acceptable amount to pay. Used for slippage protection.
    /// @param _recipient The recipient of the purchased underlying tokens
    /// @param _deadline The Unix timestamp (in seconds) after which the call will revert
    /// @return The amount paid to the fee distributor to purchase the underlying tokens
    function exercise(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        address _recipient,
        uint256 _deadline
    ) external returns (uint256) {
        if (block.timestamp > _deadline) revert OptionToken_PastDeadline();
        return _exercise(_amount, _maxPaymentAmount, _recipient);
    }

    /// @notice Exercises options tokens to purchase the underlying tokens.
    /// @dev The oracle may revert if it cannot give a secure result.
    /// @param _amount The amount of options tokens to exercise
    /// @param _maxPaymentAmount The maximum acceptable amount to pay. Used for slippage protection.
    /// @param _recipient The recipient of the purchased underlying tokens
    /// @param _deadline The Unix timestamp (in seconds) after which the call will revert
    /// @return The amount paid to the fee distributor to purchase the underlying tokens
    function exerciseVe(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        address _recipient,
        uint256 _deadline
    ) external returns (uint256, uint256) {
        if (block.timestamp > _deadline) revert OptionToken_PastDeadline();
        return _exerciseVe(_amount, _maxPaymentAmount, _recipient);
    }

    /// -----------------------------------------------------------------------
    /// Public functions
    /// -----------------------------------------------------------------------

    /// @notice Returns the discounted price in paymentTokens for a given amount of options tokens
    /// @param _amount The amount of options tokens to exercise
    /// @return The amount of payment tokens to pay to purchase the underlying tokens
    function getDiscountedPrice(uint256 _amount) public view returns (uint256) {
        return (getTimeWeightedAveragePrice(_amount) * discount) / 100;
    }

    /// @notice Returns the discounted price in paymentTokens for a given amount of options tokens redeemed to veFLOW
    /// @param _amount The amount of options tokens to exercise
    /// @return The amount of payment tokens to pay to purchase the underlying tokens
    function getVeDiscountedPrice(
        uint256 _amount
    ) public view returns (uint256) {
        return (getTimeWeightedAveragePrice(_amount) * veDiscount) / 100;
    }

    /// @notice Returns the average price in payment tokens over period defined in twapSeconds for a given amount of underlying tokens
    /// @param _amount The amount of underlying tokens to purchase
    /// @return The amount of payment tokens
    function getTimeWeightedAveragePrice(
        uint256 _amount
    ) public view returns (uint256) {
        return
            twapOracle.estimateAmountOut(
                address(underlyingToken),
                uint128(_amount),
                twapSeconds
            );
    }

    /// -----------------------------------------------------------------------
    /// Admin functions
    /// -----------------------------------------------------------------------


    function addGaugeFactory(address _gaugeFactory) public onlyAdmin {
        _grantRole(ADMIN_ROLE, _gaugeFactory);
    }

    /// @notice Sets the twap oracle contract address.
    /// @param _twapOracle The new twap oracle contract address
    function setTwapOracleAndPaymentToken(
        IUniswapV3Twap _twapOracle,
        address _paymentToken
    ) external onlyAdmin {
        if (
            !((_twapOracle.token0() == _paymentToken &&
                _twapOracle.token1() == address(underlyingToken)) ||
                (_twapOracle.token0() == address(underlyingToken) &&
                    _twapOracle.token1() == _paymentToken))
        ) revert OptionToken_IncorrectPairToken();
        twapOracle = _twapOracle;
        paymentToken = ERC20(_paymentToken);
        paymentToken.approve(address(feeDistributor), type(uint256).max);
        emit SetTwapOracleAndPaymentToken(_twapOracle, _paymentToken);
    }

    /// @notice Sets the fee distributor. Only callable by the admin.
    /// @param _feeDistributor The new fee distributor.
    function setFeeDistributor(
        IOptionFeeDistributor _feeDistributor
    ) external onlyAdmin {
        feeDistributor = _feeDistributor;
        paymentToken.approve(address(_feeDistributor), type(uint256).max);
        emit SetFeeDistributor(_feeDistributor);
    }

    /// @notice Sets the discount amount. Only callable by the admin.
    /// @param _discount The new discount amount.
    function setDiscount(uint256 _discount) external onlyAdmin {
        if (_discount > MAX_DISCOUNT || _discount == MIN_DISCOUNT)
            revert OptionToken_InvalidDiscount();
        discount = _discount;
        emit SetDiscount(_discount);
    }

    /// @notice Sets the further discount amount for locking. Only callable by the admin.
    /// @param _veDiscount The new discount amount.
    function setVeDiscount(uint256 _veDiscount) external onlyAdmin {
        if (_veDiscount > MAX_DISCOUNT || _veDiscount == MIN_DISCOUNT)
            revert OptionToken_InvalidDiscount();
        veDiscount = _veDiscount;
        emit SetVeDiscount(_veDiscount);
    }

    /// @notice Sets the twap seconds to control the length of our twap
    /// @param _twapSeconds The new twap points.
    function setTwapSeconds(uint32 _twapSeconds) external onlyAdmin {
        if (_twapSeconds > MAX_TWAP_SECONDS || _twapSeconds == 0)
            revert OptionToken_InvalidTwapSeconds();
        twapSeconds = _twapSeconds;
        emit SetTwapSeconds(_twapSeconds);
    }

    /// @notice Called by the admin to mint options tokens. Admin must grant token approval.
    /// @param _to The address that will receive the minted options tokens
    /// @param _amount The amount of options tokens that will be minted
    function mint(address _to, uint256 _amount) external onlyMinter {
        // transfer underlying tokens from the caller
        underlyingToken.transferFrom(msg.sender, address(this), _amount); // BLOTR reverts on failure
        // mint options tokens
        _mint(_to, _amount);
    }

    /// @notice Called by the admin to burn options tokens and transfer underlying tokens to the caller.
    /// @param _amount The amount of options tokens that will be burned and underlying tokens transferred to the caller
    function burn(uint256 _amount) external onlyAdmin {
        // transfer underlying tokens to the caller
        underlyingToken.transfer(msg.sender, _amount); // BLOTR reverts on failure
        // burn option tokens
        _burn(msg.sender, _amount);
    }

    /// @notice called by the admin to re-enable option exercising from a paused state.
    function unPause() external onlyAdmin {
        if (!isPaused) return;
        isPaused = false;
        emit PauseStateChanged(false);
    }

    /// -----------------------------------------------------------------------
    /// Pauser functions
    /// -----------------------------------------------------------------------
    function pause() external onlyPauser {
        if (isPaused) return;
        isPaused = true;
        emit PauseStateChanged(true);
    }

    /// -----------------------------------------------------------------------
    /// Internal functions
    /// -----------------------------------------------------------------------

    function _exercise(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        address _recipient
    ) internal returns (uint256 paymentAmount) {
        if (isPaused) revert OptionToken_Paused();

        // burn callers tokens
        _burn(msg.sender, _amount);
        paymentAmount = getDiscountedPrice(_amount);
        if (paymentAmount > _maxPaymentAmount)
            revert OptionToken_SlippageTooHigh();

        // transfer payment tokens from msg.sender to the fee distributor
        paymentToken.transferFrom(msg.sender, address(this), paymentAmount);
        feeDistributor.distribute(address(paymentToken), paymentAmount);

        // send underlying tokens to recipient
        underlyingToken.transfer(_recipient, _amount); // will revert on failure

        emit Exercise(msg.sender, _recipient, _amount, paymentAmount);
    }

    function _exerciseVe(
        uint256 _amount,
        uint256 _maxPaymentAmount,
        address _recipient
    ) internal returns (uint256 paymentAmount, uint256 nftId) {
        if (isPaused) revert OptionToken_Paused();

        // burn callers tokens
        _burn(msg.sender, _amount);
        paymentAmount = getVeDiscountedPrice(_amount);
        if (paymentAmount > _maxPaymentAmount)
            revert OptionToken_SlippageTooHigh();

        // transfer payment tokens from msg.sender to the fee distributor
        paymentToken.transferFrom(msg.sender, address(this), paymentAmount);
        feeDistributor.distribute(address(paymentToken), paymentAmount);

        // lock underlying tokens to veFLOW
        underlyingToken.approve(votingEscrow, _amount);
        nftId = IVotingEscrow(votingEscrow).create_lock_for(
            _amount,
            FULL_LOCK,
            _recipient
        );

        emit ExerciseVe(msg.sender, _recipient, _amount, paymentAmount, nftId);
    }
}

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

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

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

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

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

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

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

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

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

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

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

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

pragma solidity ^0.8.0;

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

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

import "./math/Math.sol";

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

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

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

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

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

interface IOptionFeeDistributor {
    function distribute(address token, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

interface IRetro {
    function totalSupply() external view returns (uint);
    function balanceOf(address) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);
    function transfer(address, uint) external returns (bool);
    function transferFrom(address,address,uint) external returns (bool);
    function mint(address, uint) external returns (bool);
    function minter() external returns (address);
    function setMinter(address) external;
}

// SPDX-License-Identifier: MIT
interface IUniswapV3Twap {
    function token0() external view returns (address);

    function token1() external view returns (address);

    function pool() external view returns (address);

    function estimateAmountOut(
        address tokenIn,
        uint128 amountIn,
        uint32 secondsAgo
    ) external view returns (uint amountOut);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

interface IVotingEscrow {

    struct Point {
        int128 bias;
        int128 slope; // # -dweight / dt
        uint256 ts;
        uint256 blk; // block
    }

    struct LockedBalance {
        int128 amount;
        uint end;
    }

    function create_lock_for(uint _value, uint _lock_duration, address _to) external returns (uint);

    function locked(uint id) external view returns(LockedBalance memory);
    function tokenOfOwnerByIndex(address _owner, uint _tokenIndex) external view returns (uint);

    function token() external view returns (address);
    function team() external returns (address);
    function epoch() external view returns (uint);
    function point_history(uint loc) external view returns (Point memory);
    function user_point_history(uint tokenId, uint loc) external view returns (Point memory);
    function user_point_epoch(uint tokenId) external view returns (uint);

    function ownerOf(uint) external view returns (address);
    function isApprovedOrOwner(address, uint) external view returns (bool);
    function transferFrom(address, address, uint) external;

    function voted(uint) external view returns (bool);
    function attachments(uint) external view returns (uint);
    function voting(uint tokenId) external;
    function abstain(uint tokenId) external;
    function attach(uint tokenId) external;
    function detach(uint tokenId) external;

    function checkpoint() external;
    function deposit_for(uint tokenId, uint value) external;

    function balanceOfNFT(uint _id) external view returns (uint);
    function balanceOf(address _owner) external view returns (uint);
    function totalSupply() external view returns (uint);
    function supply() external view returns (uint);
    function balanceOfNFTAt(uint _tokenId, uint _t) external view returns (uint);


    function decimals() external view returns(uint8);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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IUniswapV3Twap","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"twapSeconds","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unPause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"underlyingToken","outputs":[{"internalType":"contract ERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"veDiscount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"votingEscrow","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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

-----Decoded View---------------
Arg [0] : _name (string): Option to buy RETRO
Arg [1] : _symbol (string): oRETRO
Arg [2] : _admin (address): 0xc8949dbaf261365083a4b46ab683BaE1C9273203
Arg [3] : _paymentToken (address): 0x5D066D022EDE10eFa2717eD3D79f22F949F8C175
Arg [4] : _underlyingToken (address): 0xBFA35599c7AEbb0dAcE9b5aa3ca5f2a79624D8Eb
Arg [5] : _twapOracle (address): 0x98E989356282fe847493ad636391DCA0189961B2
Arg [6] : _feeDistributor (address): 0x5D798ef47e1260491501E4bAA70c36b183fBdddA
Arg [7] : _discount (uint256): 50
Arg [8] : _veDiscount (uint256): 0
Arg [9] : _votingEscrow (address): 0xB419cE2ea99f356BaE0caC47282B9409E38200fa

-----Encoded View---------------
14 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000180
Arg [2] : 000000000000000000000000c8949dbaf261365083a4b46ab683bae1c9273203
Arg [3] : 0000000000000000000000005d066d022ede10efa2717ed3d79f22f949f8c175
Arg [4] : 000000000000000000000000bfa35599c7aebb0dace9b5aa3ca5f2a79624d8eb
Arg [5] : 00000000000000000000000098e989356282fe847493ad636391dca0189961b2
Arg [6] : 0000000000000000000000005d798ef47e1260491501e4baa70c36b183fbddda
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000032
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [9] : 000000000000000000000000b419ce2ea99f356bae0cac47282b9409e38200fa
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000013
Arg [11] : 4f7074696f6e20746f2062757920524554524f00000000000000000000000000
Arg [12] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [13] : 6f524554524f0000000000000000000000000000000000000000000000000000