// 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 (last updated v4.8.0) (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 functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

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

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

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

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

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

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

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

// SPDX-License-Identifier: 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 {VotingEscrow} from "./VotingEscrow.sol";
import {OptionTokenV2} from "./OptionTokenV2.sol";

import {console} from "hardhat/console.sol";

contract BribeOptionToken is ERC20, AccessControl {
    /// -----------------------------------------------------------------------
    /// 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_Paused();

    /// -----------------------------------------------------------------------
    /// Events
    /// -----------------------------------------------------------------------
    event ExerciseVe(
        address indexed sender,
        address indexed recipient,
        uint256 amount,
        uint256 nftId
    );

    event PauseStateChanged(bool 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();
        _;
    }

    /// @notice The underlying token purchased during redemption
    VotingEscrow public immutable votingEscrow;

    /// @notice The underlying token purchased during redemption
    OptionTokenV2 public immutable optionToken;

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

    constructor(
        string memory _name,
        string memory _symbol,
        OptionTokenV2 _optionToken,
        address _admin
    ) 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);

        optionToken = _optionToken;
        votingEscrow = VotingEscrow(optionToken.votingEscrow());
    }

    /// @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
        optionToken.transferFrom(msg.sender, address(this), _amount); // BLOTR reverts on failure
        // mint options tokens
        _mint(_to, _amount);
    }

    /// @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 _recipient The recipient of the purchased underlying tokens
    /// @param _deadline The Unix timestamp (in seconds) after which the call will revert
    /// @return nftId The amount paid to the fee distributor to purchase the underlying tokens
    function exerciseVe(
        uint256 _amount,
        address _recipient,
        uint256 _deadline
    ) external returns (uint256 nftId) {
        if (block.timestamp > _deadline) revert OptionToken_PastDeadline();
        if (isPaused) revert OptionToken_Paused();

        // burn callers tokens
        _burn(msg.sender, _amount);

        (, nftId) = optionToken.exerciseVe(_amount, 0, _recipient, _deadline);

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

    /// @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);
    }
}

// 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 (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 (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
pragma solidity 0.8.13;

interface IBlue {
    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
// 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
pragma solidity 0.8.13;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function transfer(address recipient, uint amount) external returns (bool);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function balanceOf(address) external view returns (uint);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}

// 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 v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

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

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

interface IRewardsDistributor {
    function checkpoint_token() external;
    function voting_escrow() external view returns(address);
    function checkpoint_total_supply() external;
    function claim(uint _tokenId) external returns(uint);
    function claimable(uint _tokenId) external view returns (uint);
}

// 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 IVeArtProxy {
    function _tokenURI(uint _tokenId, uint _balanceOf, uint _locked_end, uint _value) external view returns (string memory output);
}

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

interface IVoter {
    function claimBribes(address[] memory _bribes, address[][] memory _tokens, uint256 _tokenId) external;
    function claimFees(address[] memory _fees, address[][] memory _tokens, uint256 _tokenId) external;
    function reset(uint256 _tokenId) external;
    function vote(uint256 _tokenId, address[] calldata _poolVote, uint256[] calldata _weights) external;
    function poke(uint256 _tokenId) external;
    function _epochTimestamp() external view returns(uint256);

    function _ve() external view returns (address);
    function gauges(address _pair) external view returns (address);
    function isGauge(address _gauge) external view returns (bool);
    function poolForGauge(address _gauge) external view returns (address);
    function factory() external view returns (address);
    function minter() external view returns(address);
    function isWhitelisted(address token) external view returns (bool);
    function notifyRewardAmount(uint amount) external;
    function distributeAll() external;
    function distributeFees(address[] memory _gauges) external;

    function internal_bribes(address _gauge) external view returns (address);
    function external_bribes(address _gauge) external view returns (address);

    function usedWeights(uint id) external view returns(uint);
    function lastVoted(uint id) external view returns(uint);
    function poolVote(uint id, uint _index) external view returns(address _pair);
    function votes(uint id, address _pool) external view returns(uint votes);
    function poolVoteLength(uint tokenId) external view returns(uint);
    
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (governance/utils/IVotes.sol)
pragma solidity ^0.8.0;

/**
 * @dev Common interface for {ERC20Votes}, {ERC721Votes}, and other {Votes}-enabled contracts.
 *
 * _Available since v4.5._
 */
interface IVotes {
    /**
     * @dev Emitted when an account changes their delegate.
     */
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /**
     * @dev Emitted when a token transfer or delegate change results in changes to a delegate's number of votes.
     */
    event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);

    /**
     * @dev Returns the current amount of votes that `account` has.
     */
    function getVotes(address account) external view returns (uint256);

    /**
     * @dev Returns the amount of votes that `account` had at the end of a past block (`blockNumber`).
     */
    function getPastVotes(address account, uint256 blockNumber) external view returns (uint256);

    /**
     * @dev Returns the total supply of votes available at the end of a past block (`blockNumber`).
     *
     * NOTE: This value is the sum of all available votes, which is not necessarily the sum of all delegated votes.
     * Votes that have not been delegated are still part of total supply, even though they would not participate in a
     * vote.
     */
    function getPastTotalSupply(uint256 blockNumber) external view returns (uint256);

    /**
     * @dev Returns the delegate that `account` has chosen.
     */
    function delegates(address account) external view returns (address);

    /**
     * @dev Delegates votes from the sender to `delegatee`.
     */
    function delegate(address delegatee) external;

    /**
     * @dev Delegates votes from signer to `delegatee`.
     */
    function delegateBySig(
        address delegatee,
        uint256 nonce,
        uint256 expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

// 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(uint _value, uint _lock_duration) external returns (uint);
    function create_lock_for(uint _value, uint _lock_duration, address _to) external returns (uint);
    function merge(uint _from, uint _to) external;
    function increase_amount(uint _tokenId, uint _value) external;
    function increase_unlock_time(uint _tokenId, uint _lock_duration) external;
    function split(uint[] memory amounts, uint _tokenId) external;
    function withdraw(uint _tokenId) external;
    function setApprovalForAll(address _operator, bool _approved) external;

    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 optionToken() external view returns (address);
    function ownerOf(uint) external view returns (address);
    function isApprovedOrOwner(address, uint) external view returns (bool);
    function transferFrom(address, address, uint) external;
    function safeTransferFrom(
        address _from,
        address _to,
        uint _tokenId
    ) 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 balanceOfAtNFT(uint _tokenId, uint _t) external view returns (uint);



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

// 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: AGPL-3.0
pragma solidity 0.8.13;

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

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import {IBlue} from "./interfaces/IBlue.sol";
import {IVotingEscrow} from "./interfaces/IVotingEscrow.sol";
import {IUniswapV3Twap} from "./interfaces/IUniswapV3Twap.sol";
import {IOptionFeeDistributor} from "./interfaces/IOptionFeeDistributor.sol";
import {IVoter} from "./interfaces/IVoter.sol";
import {IRewardsDistributor} from "./interfaces/IRewardsDistributor.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, ReentrancyGuard {
    using SafeERC20 for IERC20;
    /// -----------------------------------------------------------------------
    /// 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
    uint256 public constant feeDenominator = 10000;

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

    bytes32 public constant VOTER_ROLE = keccak256("VOTER");


    /// @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_NoVoterRole();
    error OptionToken_NoPauserRole();
    error OptionToken_SlippageTooHigh();
    error OptionToken_InvalidDiscount();
    error OptionToken_Paused();
    error OptionToken_InvalidTwapSeconds();
    error OptionToken_IncorrectPairToken();
    error InvalidArrayLength();

    /// -----------------------------------------------------------------------
    /// 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;

    /// @notice receives conversion fee
    address public feeReceiver;

    /// @notice conversion fee
    uint256 public fee;

    /// -----------------------------------------------------------------------
    /// 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 voter contract
    IVoter public voter;

    /// @notice The rebase distributor contract
    IRewardsDistributor public rewardsDistributor;

    /// @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 saved tokenID from last creation of veBLUE position
    uint256 public veNftId;

    /// @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;

    // vote params
    mapping(uint256 => address[]) public _savedPoolVote;
    mapping(uint256 => uint256[]) public _savedWeights;

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

    modifier onlyVoter() {
        if (
            !hasRole(ADMIN_ROLE, msg.sender) &&
            !hasRole(VOTER_ROLE, msg.sender)
        ) revert OptionToken_NoVoterRole();
        _;
    }

    /// @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(VOTER_ROLE, ADMIN_ROLE);
        _setRoleAdmin(PAUSER_ROLE, ADMIN_ROLE);

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

        if(address(paymentToken) != address(0)){
            paymentToken.approve(address(_feeDistributor), type(uint256).max);
        }
        if(_votingEscrow != address(0)){
            underlyingToken.approve(_votingEscrow, 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 nonReentrant 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 nonReentrant 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 nonReentrant 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);
    }

    function setVoterAndDistributor(
        IVoter _voter,
        IRewardsDistributor _rewardsDistributor
    ) external onlyAdmin {
        voter = _voter;
        rewardsDistributor = _rewardsDistributor;
    }

    function setFeeConfig(address _feeReceiver, uint256 _fee) external onlyAdmin {
        feeReceiver = _feeReceiver;
        fee = _fee;
    }

    function updateApproval() external onlyAdmin {
        underlyingToken.approve(votingEscrow, type(uint256).max);
    }

    /// @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 anyone or admin to mint options tokens. Caller 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 nonReentrant {
        if (isPaused) revert OptionToken_Paused();
        
        uint256 totalBlue = getVeBalance();
        uint256 totalShares = totalSupply();
        uint256 _fee;

        if(feeReceiver != address(0) && !voter.isGauge(msg.sender)){
            _fee = _amount * fee / feeDenominator;
            underlyingToken.transferFrom(msg.sender, feeReceiver, _fee);
            _amount = _amount - _fee;
        }

        if(totalBlue == 0 || totalShares == 0){
            _mint(_to, _amount);
        }else{
            uint256 what = _amount * totalShares / totalBlue;
            _mint(_to, what);
        }

        underlyingToken.transferFrom(msg.sender, address(this), _amount);

        //create veNFT or add to existing
        if(veNftId == 0){
            veNftId = IVotingEscrow(votingEscrow).create_lock(underlyingToken.balanceOf(address(this)), FULL_LOCK);
        }else{
            IVotingEscrow(votingEscrow).increase_amount(veNftId, _amount);
        }
        _vote();

    }

    // to increase ve power from liquidated bribes and fees. Also increases underlying share of oToken
    function donate(uint256 _amount) external nonReentrant {
        require(veNftId != 0, "no venftId");
        underlyingToken.transferFrom(msg.sender, address(this), _amount);
        IVotingEscrow(votingEscrow).increase_amount(veNftId, _amount);
        _vote();
    }

    function getVeBalance() public view returns(uint256) {
        if(veNftId == 0){
            return 0;
        }

        return uint(int256(IVotingEscrow(votingEscrow).locked(veNftId).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 nonReentrant {

        uint256 totalShares = totalSupply();
        uint256 what = _amount * getVeBalance() / totalShares;

        //burns nft and releasing liquid BLUE 
        voter.reset(veNftId);
        IVotingEscrow(votingEscrow).withdraw(veNftId);

        // burn option tokens
        _burn(msg.sender, _amount);

        // transfer underlying tokens to the caller
        underlyingToken.transfer(msg.sender, what);

        // send everything back to veNFT
        veNftId = IVotingEscrow(votingEscrow).create_lock(underlyingToken.balanceOf(address(this)), FULL_LOCK);
        _vote();
        
    }

    function claimRebase() external onlyAdmin nonReentrant {
        rewardsDistributor.claim(veNftId);
    }

    function vote(address[] calldata _poolVote, uint256[] calldata _weights) external onlyVoter {
        _savedPoolVote[voter._epochTimestamp()] = _poolVote;
        _savedWeights[voter._epochTimestamp()] = _weights;
        _vote();
    }

    function clearStorage(uint256 epochTimestamp) external onlyVoter {
        delete _savedPoolVote[epochTimestamp];
        delete _savedWeights[epochTimestamp];
    }

    function _vote() internal {
        if(_savedPoolVote[voter._epochTimestamp()].length > 0 && _savedPoolVote[voter._epochTimestamp()].length == _savedWeights[voter._epochTimestamp()].length){
            voter.vote(veNftId, _savedPoolVote[voter._epochTimestamp()], _savedWeights[voter._epochTimestamp()]);
        }
    }

    function sendRewards(address[][] calldata tokens_, address _to) internal {
        for (uint256 i = 0; i < tokens_.length; ) {
            for (uint256 j = 0; j < tokens_[i].length; ) {
                IERC20 token = IERC20(tokens_[i][j]);
                token.safeTransfer(_to, token.balanceOf(address(this)));
                unchecked {
                    j++;
                }
            }
            unchecked {
                i++;
            }
        }
    }

    function claimBribes(address[] calldata bribes_, address[][] calldata bribeTokens_, address _to) external onlyAdmin {
        if (bribes_.length != bribeTokens_.length) {
            revert InvalidArrayLength();
        }
        voter.claimBribes(bribes_, bribeTokens_, veNftId);
        sendRewards(bribeTokens_, _to);
    }

    /// @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();

        uint256 totalShares = totalSupply();
        uint256 what = _amount * getVeBalance() / totalShares;

        voter.reset(veNftId);
        IVotingEscrow(votingEscrow).withdraw(veNftId);

        // burn callers tokens
        _burn(msg.sender, _amount);

        if(discount > 0){
            paymentAmount = getDiscountedPrice(what);
            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, what); // will revert on failure
        
        veNftId = IVotingEscrow(votingEscrow).create_lock(underlyingToken.balanceOf(address(this)), FULL_LOCK);
        _vote();

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

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

        uint256 totalShares = totalSupply();
        uint256 what = _amount * getVeBalance() / totalShares;

        voter.reset(veNftId);
        IVotingEscrow(votingEscrow).withdraw(veNftId);

        // burn callers tokens
        _burn(msg.sender, _amount);

        if(veDiscount > 0){
            paymentAmount = getVeDiscountedPrice(what);
            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);
        }

        nftId = IVotingEscrow(votingEscrow).create_lock_for(
            what,
            FULL_LOCK,
            _recipient
        );

        veNftId = IVotingEscrow(votingEscrow).create_lock(underlyingToken.balanceOf(address(this)), FULL_LOCK);
        _vote();

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

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

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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");
        }
    }
}

// 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);
    }
}

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

import {IERC721, IERC721Metadata} from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import {IVotes} from "@openzeppelin/contracts/governance/utils/IVotes.sol";
import {IERC721Receiver} from "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import {IERC20} from "./interfaces/IERC20.sol";
import {IVeArtProxy} from "./interfaces/IVeArtProxy.sol";
import {IVotingEscrow} from "./interfaces/IVotingEscrow.sol";

interface IVoter {
    function minter() external view returns(address);
}

interface IMinter {
    function _rewards_distributor() external view returns(address);
}

/// @title Voting Escrow
/// @notice veNFT implementation that escrows ERC-20 tokens in the form of an ERC-721 NFT
/// @notice Votes have a weight depending on time, so that users are committed to the future of (whatever they are voting for)
/// @author Modified from Solidly (https://github.com/solidlyexchange/solidly/blob/master/contracts/ve.sol)
/// @author Modified from Curve (https://github.com/curvefi/curve-dao-contracts/blob/master/contracts/VotingEscrow.vy)
/// @author Modified from Nouns DAO (https://github.com/withtally/my-nft-dao-project/blob/main/contracts/ERC721Checkpointable.sol)
/// @dev Vote weight decays linearly over time. Lock time cannot be more than `MAXTIME` (2 years).
contract VotingEscrow is IERC721, IERC721Metadata, IVotes {
    enum DepositType {
        DEPOSIT_FOR_TYPE,
        CREATE_LOCK_TYPE,
        INCREASE_LOCK_AMOUNT,
        INCREASE_UNLOCK_TIME,
        MERGE_TYPE,
        SPLIT_TYPE
    }

    struct LockedBalance {
        int128 amount;
        uint end;
    }

    struct Point {
        int128 bias;
        int128 slope; // # -dweight / dt
        uint ts;
        uint blk; // block
    }
    /* We cannot really do block numbers per se b/c slope is per time, not per block
     * and per block could be fairly bad b/c Ethereum changes blocktimes.
     * What we can do is to extrapolate ***At functions */

    /// @notice A checkpoint for marking delegated tokenIds from a given timestamp
    struct Checkpoint {
        uint timestamp;
        uint[] tokenIds;
    }

    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Deposit(
        address indexed provider,
        uint tokenId,
        uint value,
        uint indexed locktime,
        DepositType deposit_type,
        uint ts
    );
    event Withdraw(address indexed provider, uint tokenId, uint value, uint ts);
    event Supply(uint prevSupply, uint supply);

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    address public immutable token;
    address public voter;
    address public team;
    address public artProxy;
    address public optionToken;

    bool public toggleMaxLock = true;

    mapping(uint => Point) public point_history; // epoch -> unsigned point

    /// @dev Mapping of interface id to bool about whether or not it's supported
    mapping(bytes4 => bool) internal supportedInterfaces;

    /// @dev ERC165 interface ID of ERC165
    bytes4 internal constant ERC165_INTERFACE_ID = 0x01ffc9a7;

    /// @dev ERC165 interface ID of ERC721
    bytes4 internal constant ERC721_INTERFACE_ID = 0x80ac58cd;

    /// @dev ERC165 interface ID of ERC721Metadata
    bytes4 internal constant ERC721_METADATA_INTERFACE_ID = 0x5b5e139f;

    /// @dev Current count of token
    uint internal tokenId;

    /// @notice Contract constructor
    /// @param token_addr `BLUE` token address
    constructor(address token_addr, address art_proxy) {
        token = token_addr;
        voter = msg.sender;
        team = msg.sender;
        artProxy = art_proxy;

        point_history[0].blk = block.number;
        point_history[0].ts = block.timestamp;

        supportedInterfaces[ERC165_INTERFACE_ID] = true;
        supportedInterfaces[ERC721_INTERFACE_ID] = true;
        supportedInterfaces[ERC721_METADATA_INTERFACE_ID] = true;

        // mint-ish
        emit Transfer(address(0), address(this), tokenId);
        // burn-ish
        emit Transfer(address(this), address(0), tokenId);
    }

    /*//////////////////////////////////////////////////////////////
                                MODIFIERS
    //////////////////////////////////////////////////////////////*/

    /// @dev reentrancy guard
    uint8 internal constant _not_entered = 1;
    uint8 internal constant _entered = 2;
    uint8 internal _entered_state = 1;
    modifier nonreentrant() {
        require(_entered_state == _not_entered);
        _entered_state = _entered;
        _;
        _entered_state = _not_entered;
    }

    /*///////////////////////////////////////////////////////////////
                             METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string constant public name = "veBlue";
    string constant public symbol = "veBLUE";
    string constant public version = "1.0.0";
    uint8 constant public decimals = 18;

    function setTeam(address _team) external {
        require(msg.sender == team);
        team = _team;
    }

    function setOptionToken(address _optionToken) external {
        require(msg.sender == team);
        optionToken = _optionToken;
    }

    function setArtProxy(address _proxy) external {
        require(msg.sender == team);
        artProxy = _proxy;
    }

    /// @dev Returns current token URI metadata
    /// @param _tokenId Token ID to fetch URI for.
    function tokenURI(uint _tokenId) external view returns (string memory) {
        require(idToOwner[_tokenId] != address(0), "Query for nonexistent token");
        LockedBalance memory _locked = locked[_tokenId];
        return IVeArtProxy(artProxy)._tokenURI(_tokenId,_balanceOfNFT(_tokenId, block.timestamp),_locked.end,uint(int256(_locked.amount)));
    }

    /*//////////////////////////////////////////////////////////////
                      ERC721 BALANCE/OWNER STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @dev Mapping from NFT ID to the address that owns it.
    mapping(uint => address) internal idToOwner;

    /// @dev Mapping from owner address to count of his tokens.
    mapping(address => uint) internal ownerToNFTokenCount;

    /// @dev Returns the address of the owner of the NFT.
    /// @param _tokenId The identifier for an NFT.
    function ownerOf(uint _tokenId) public view returns (address) {
        return idToOwner[_tokenId];
    }

    /// @dev Returns the number of NFTs owned by `_owner`.
    ///      Throws if `_owner` is the zero address. NFTs assigned to the zero address are considered invalid.
    /// @param _owner Address for whom to query the balance.
    function _balance(address _owner) internal view returns (uint) {
        return ownerToNFTokenCount[_owner];
    }

    /// @dev Returns the number of NFTs owned by `_owner`.
    ///      Throws if `_owner` is the zero address. NFTs assigned to the zero address are considered invalid.
    /// @param _owner Address for whom to query the balance.
    function balanceOf(address _owner) external view returns (uint) {
        return _balance(_owner);
    }

    /*//////////////////////////////////////////////////////////////
                         ERC721 APPROVAL STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @dev Mapping from NFT ID to approved address.
    mapping(uint => address) internal idToApprovals;

    /// @dev Mapping from owner address to mapping of operator addresses.
    mapping(address => mapping(address => bool)) internal ownerToOperators;

    mapping(uint => uint) public ownership_change;

    /// @dev Get the approved address for a single NFT.
    /// @param _tokenId ID of the NFT to query the approval of.
    function getApproved(uint _tokenId) external view returns (address) {
        return idToApprovals[_tokenId];
    }

    /// @dev Checks if `_operator` is an approved operator for `_owner`.
    /// @param _owner The address that owns the NFTs.
    /// @param _operator The address that acts on behalf of the owner.
    function isApprovedForAll(address _owner, address _operator) external view returns (bool) {
        return (ownerToOperators[_owner])[_operator];
    }

    /*//////////////////////////////////////////////////////////////
                              ERC721 LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @dev Set or reaffirm the approved address for an NFT. The zero address indicates there is no approved address.
    ///      Throws unless `msg.sender` is the current NFT owner, or an authorized operator of the current owner.
    ///      Throws if `_tokenId` is not a valid NFT. (NOTE: This is not written the EIP)
    ///      Throws if `_approved` is the current owner. (NOTE: This is not written the EIP)
    /// @param _approved Address to be approved for the given NFT ID.
    /// @param _tokenId ID of the token to be approved.
    function approve(address _approved, uint _tokenId) public {
        address owner = idToOwner[_tokenId];
        // Throws if `_tokenId` is not a valid NFT
        require(owner != address(0));
        // Throws if `_approved` is the current owner
        require(_approved != owner);
        // Check requirements
        bool senderIsOwner = (idToOwner[_tokenId] == msg.sender);
        bool senderIsApprovedForAll = (ownerToOperators[owner])[msg.sender];
        require(senderIsOwner || senderIsApprovedForAll);
        // Set the approval
        idToApprovals[_tokenId] = _approved;
        emit Approval(owner, _approved, _tokenId);
    }

    /// @dev Enables or disables approval for a third party ("operator") to manage all of
    ///      `msg.sender`'s assets. It also emits the ApprovalForAll event.
    ///      Throws if `_operator` is the `msg.sender`. (NOTE: This is not written the EIP)
    /// @notice This works even if sender doesn't own any tokens at the time.
    /// @param _operator Address to add to the set of authorized operators.
    /// @param _approved True if the operators is approved, false to revoke approval.
    function setApprovalForAll(address _operator, bool _approved) external {
        // Throws if `_operator` is the `msg.sender`
        assert(_operator != msg.sender);
        ownerToOperators[msg.sender][_operator] = _approved;
        emit ApprovalForAll(msg.sender, _operator, _approved);
    }

    /* TRANSFER FUNCTIONS */
    /// @dev Clear an approval of a given address
    ///      Throws if `_owner` is not the current owner.
    function _clearApproval(address _owner, uint _tokenId) internal {
        // Throws if `_owner` is not the current owner
        assert(idToOwner[_tokenId] == _owner);
        if (idToApprovals[_tokenId] != address(0)) {
            // Reset approvals
            idToApprovals[_tokenId] = address(0);
        }
    }

    /// @dev Returns whether the given spender can transfer a given token ID
    /// @param _spender address of the spender to query
    /// @param _tokenId uint ID of the token to be transferred
    /// @return bool whether the msg.sender is approved for the given token ID, is an operator of the owner, or is the owner of the token
    function _isApprovedOrOwner(address _spender, uint _tokenId) internal view returns (bool) {
        address owner = idToOwner[_tokenId];
        bool spenderIsOwner = owner == _spender;
        bool spenderIsApproved = _spender == idToApprovals[_tokenId];
        bool spenderIsApprovedForAll = (ownerToOperators[owner])[_spender];
        return spenderIsOwner || spenderIsApproved || spenderIsApprovedForAll;
    }

    function isApprovedOrOwner(address _spender, uint _tokenId) external view returns (bool) {
        return _isApprovedOrOwner(_spender, _tokenId);
    }

    /// @dev Exeute transfer of a NFT.
    ///      Throws unless `msg.sender` is the current owner, an authorized operator, or the approved
    ///      address for this NFT. (NOTE: `msg.sender` not allowed in internal function so pass `_sender`.)
    ///      Throws if `_to` is the zero address.
    ///      Throws if `_from` is not the current owner.
    ///      Throws if `_tokenId` is not a valid NFT.
    function _transferFrom(
        address _from,
        address _to,
        uint _tokenId,
        address _sender
    ) internal {
        require(attachments[_tokenId] == 0 && !voted[_tokenId], "attached");
        // Check requirements
        require(_isApprovedOrOwner(_sender, _tokenId));
        // Clear approval. Throws if `_from` is not the current owner
        _clearApproval(_from, _tokenId);
        // Remove NFT. Throws if `_tokenId` is not a valid NFT
        _removeTokenFrom(_from, _tokenId);
        // auto re-delegate
        _moveTokenDelegates(delegates(_from), delegates(_to), _tokenId);
        // Add NFT
        _addTokenTo(_to, _tokenId);
        // Set the block of ownership transfer (for Flash NFT protection)
        ownership_change[_tokenId] = block.number;
        // Log the transfer
        emit Transfer(_from, _to, _tokenId);
    }

    /// @dev Throws unless `msg.sender` is the current owner, an authorized operator, or the approved address for this NFT.
    ///      Throws if `_from` is not the current owner.
    ///      Throws if `_to` is the zero address.
    ///      Throws if `_tokenId` is not a valid NFT.
    /// @notice The caller is responsible to confirm that `_to` is capable of receiving NFTs or else
    ///        they maybe be permanently lost.
    /// @param _from The current owner of the NFT.
    /// @param _to The new owner.
    /// @param _tokenId The NFT to transfer.
    function transferFrom(
        address _from,
        address _to,
        uint _tokenId
    ) external {
        _transferFrom(_from, _to, _tokenId, msg.sender);
    }

    /// @dev Transfers the ownership of an NFT from one address to another address.
    ///      Throws unless `msg.sender` is the current owner, an authorized operator, or the
    ///      approved address for this NFT.
    ///      Throws if `_from` is not the current owner.
    ///      Throws if `_to` is the zero address.
    ///      Throws if `_tokenId` is not a valid NFT.
    ///      If `_to` is a smart contract, it calls `onERC721Received` on `_to` and throws if
    ///      the return value is not `bytes4(keccak256("onERC721Received(address,address,uint,bytes)"))`.
    /// @param _from The current owner of the NFT.
    /// @param _to The new owner.
    /// @param _tokenId The NFT to transfer.
    function safeTransferFrom(
        address _from,
        address _to,
        uint _tokenId
    ) external {
        safeTransferFrom(_from, _to, _tokenId, "");
    }

    function _isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /// @dev Transfers the ownership of an NFT from one address to another address.
    ///      Throws unless `msg.sender` is the current owner, an authorized operator, or the
    ///      approved address for this NFT.
    ///      Throws if `_from` is not the current owner.
    ///      Throws if `_to` is the zero address.
    ///      Throws if `_tokenId` is not a valid NFT.
    ///      If `_to` is a smart contract, it calls `onERC721Received` on `_to` and throws if
    ///      the return value is not `bytes4(keccak256("onERC721Received(address,address,uint,bytes)"))`.
    /// @param _from The current owner of the NFT.
    /// @param _to The new owner.
    /// @param _tokenId The NFT to transfer.
    /// @param _data Additional data with no specified format, sent in call to `_to`.
    function safeTransferFrom(
        address _from,
        address _to,
        uint _tokenId,
        bytes memory _data
    ) public {
        _transferFrom(_from, _to, _tokenId, msg.sender);

        if (_isContract(_to)) {
            // Throws if transfer destination is a contract which does not implement 'onERC721Received'
            try IERC721Receiver(_to).onERC721Received(msg.sender, _from, _tokenId, _data) returns (bytes4 response) {
                if (response != IERC721Receiver(_to).onERC721Received.selector) {
                    revert("ERC721: ERC721Receiver rejected tokens");
                }
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert('ERC721: transfer to non ERC721Receiver implementer');
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        }
    }

    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @dev Interface identification is specified in ERC-165.
    /// @param _interfaceID Id of the interface
    function supportsInterface(bytes4 _interfaceID) external view returns (bool) {
        return supportedInterfaces[_interfaceID];
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @dev Mapping from owner address to mapping of index to tokenIds
    mapping(address => mapping(uint => uint)) internal ownerToNFTokenIdList;

    /// @dev Mapping from NFT ID to index of owner
    mapping(uint => uint) internal tokenToOwnerIndex;

    /// @dev  Get token by index
    function tokenOfOwnerByIndex(address _owner, uint _tokenIndex) external view returns (uint) {
        return ownerToNFTokenIdList[_owner][_tokenIndex];
    }

    /// @dev Add a NFT to an index mapping to a given address
    /// @param _to address of the receiver
    /// @param _tokenId uint ID Of the token to be added
    function _addTokenToOwnerList(address _to, uint _tokenId) internal {
        uint current_count = _balance(_to);

        ownerToNFTokenIdList[_to][current_count] = _tokenId;
        tokenToOwnerIndex[_tokenId] = current_count;
    }

    /// @dev Add a NFT to a given address
    ///      Throws if `_tokenId` is owned by someone.
    function _addTokenTo(address _to, uint _tokenId) internal {
        // Throws if `_tokenId` is owned by someone
        assert(idToOwner[_tokenId] == address(0));
        // Change the owner
        idToOwner[_tokenId] = _to;
        // Update owner token index tracking
        _addTokenToOwnerList(_to, _tokenId);
        // Change count tracking
        ownerToNFTokenCount[_to] += 1;
    }

    /// @dev Function to mint tokens
    ///      Throws if `_to` is zero address.
    ///      Throws if `_tokenId` is owned by someone.
    /// @param _to The address that will receive the minted tokens.
    /// @param _tokenId The token id to mint.
    /// @return A boolean that indicates if the operation was successful.
    function _mint(address _to, uint _tokenId) internal returns (bool) {
        // Throws if `_to` is zero address
        assert(_to != address(0));
        // checkpoint for gov
        _moveTokenDelegates(address(0), delegates(_to), _tokenId);
        // Add NFT. Throws if `_tokenId` is owned by someone
        _addTokenTo(_to, _tokenId);
        emit Transfer(address(0), _to, _tokenId);
        return true;
    }

    /// @dev Remove a NFT from an index mapping to a given address
    /// @param _from address of the sender
    /// @param _tokenId uint ID Of the token to be removed
    function _removeTokenFromOwnerList(address _from, uint _tokenId) internal {
        // Delete
        uint current_count = _balance(_from) - 1;
        uint current_index = tokenToOwnerIndex[_tokenId];

        if (current_count == current_index) {
            // update ownerToNFTokenIdList
            ownerToNFTokenIdList[_from][current_count] = 0;
            // update tokenToOwnerIndex
            tokenToOwnerIndex[_tokenId] = 0;
        } else {
            uint lastTokenId = ownerToNFTokenIdList[_from][current_count];

            // Add
            // update ownerToNFTokenIdList
            ownerToNFTokenIdList[_from][current_index] = lastTokenId;
            // update tokenToOwnerIndex
            tokenToOwnerIndex[lastTokenId] = current_index;

            // Delete
            // update ownerToNFTokenIdList
            ownerToNFTokenIdList[_from][current_count] = 0;
            // update tokenToOwnerIndex
            tokenToOwnerIndex[_tokenId] = 0;
        }
    }

    /// @dev Remove a NFT from a given address
    ///      Throws if `_from` is not the current owner.
    function _removeTokenFrom(address _from, uint _tokenId) internal {
        // Throws if `_from` is not the current owner
        assert(idToOwner[_tokenId] == _from);
        // Change the owner
        idToOwner[_tokenId] = address(0);
        // Update owner token index tracking
        _removeTokenFromOwnerList(_from, _tokenId);
        // Change count tracking
        ownerToNFTokenCount[_from] -= 1;
    }

    function _burn(uint _tokenId) internal {
        require(_isApprovedOrOwner(msg.sender, _tokenId), "caller is not owner nor approved");

        address owner = ownerOf(_tokenId);

        // Clear approval
        approve(address(0), _tokenId);
        // checkpoint for gov
        _moveTokenDelegates(delegates(owner), address(0), _tokenId);
        // Remove token
        //_removeTokenFrom(msg.sender, _tokenId);
        _removeTokenFrom(owner, _tokenId);
        
        emit Transfer(owner, address(0), _tokenId);
    }

    /*//////////////////////////////////////////////////////////////
                             ESCROW STORAGE
    //////////////////////////////////////////////////////////////*/

    mapping(uint => uint) public user_point_epoch;
    mapping(uint => Point[1000000000]) public user_point_history; // user -> Point[user_epoch]
    mapping(uint => LockedBalance) public locked;
    uint public epoch;
    mapping(uint => int128) public slope_changes; // time -> signed slope change
    uint public supply;

    uint internal constant WEEK = 1 weeks;
    uint internal constant MAXTIME = 2 * 365 * 86400;
    int128 internal constant iMAXTIME = 2 * 365 * 86400;
    uint internal constant MULTIPLIER = 1 ether;

    /*//////////////////////////////////////////////////////////////
                              ESCROW LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @notice Get the most recently recorded rate of voting power decrease for `_tokenId`
    /// @param _tokenId token of the NFT
    /// @return Value of the slope
    function get_last_user_slope(uint _tokenId) external view returns (int128) {
        uint uepoch = user_point_epoch[_tokenId];
        return user_point_history[_tokenId][uepoch].slope;
    }

    /// @notice Get the timestamp for checkpoint `_idx` for `_tokenId`
    /// @param _tokenId token of the NFT
    /// @param _idx User epoch number
    /// @return Epoch time of the checkpoint
    function user_point_history__ts(uint _tokenId, uint _idx) external view returns (uint) {
        return user_point_history[_tokenId][_idx].ts;
    }

    /// @notice Get timestamp when `_tokenId`'s lock finishes
    /// @param _tokenId User NFT
    /// @return Epoch time of the lock end
    function locked__end(uint _tokenId) external view returns (uint) {
        return locked[_tokenId].end;
    }

    /// @notice Record global and per-user data to checkpoint
    /// @param _tokenId NFT token ID. No user checkpoint if 0
    /// @param old_locked Pevious locked amount / end lock time for the user
    /// @param new_locked New locked amount / end lock time for the user
    function _checkpoint(
        uint _tokenId,
        LockedBalance memory old_locked,
        LockedBalance memory new_locked
    ) internal {
        Point memory u_old;
        Point memory u_new;
        int128 old_dslope = 0;
        int128 new_dslope = 0;
        uint _epoch = epoch;

        if (_tokenId != 0) {
            // Calculate slopes and biases
            // Kept at zero when they have to
            if (old_locked.end > block.timestamp && old_locked.amount > 0) {
                u_old.slope = old_locked.amount / iMAXTIME;
                u_old.bias = u_old.slope * int128(int256(old_locked.end - block.timestamp));
            }
            if (new_locked.end > block.timestamp && new_locked.amount > 0) {
                u_new.slope = new_locked.amount / iMAXTIME;
                u_new.bias = u_new.slope * int128(int256(new_locked.end - block.timestamp));
            }

            // Read values of scheduled changes in the slope
            // old_locked.end can be in the past and in the future
            // new_locked.end can ONLY by in the FUTURE unless everything expired: than zeros
            old_dslope = slope_changes[old_locked.end];
            if (new_locked.end != 0) {
                if (new_locked.end == old_locked.end) {
                    new_dslope = old_dslope;
                } else {
                    new_dslope = slope_changes[new_locked.end];
                }
            }
        }

        Point memory last_point = Point({bias: 0, slope: 0, ts: block.timestamp, blk: block.number});
        if (_epoch > 0) {
            last_point = point_history[_epoch];
        }
        uint last_checkpoint = last_point.ts;
        // initial_last_point is used for extrapolation to calculate block number
        // (approximately, for *At methods) and save them
        // as we cannot figure that out exactly from inside the contract
        Point memory initial_last_point = last_point;
        uint block_slope = 0; // dblock/dt
        if (block.timestamp > last_point.ts) {
            block_slope = (MULTIPLIER * (block.number - last_point.blk)) / (block.timestamp - last_point.ts);
        }
        // If last point is already recorded in this block, slope=0
        // But that's ok b/c we know the block in such case

        // Go over weeks to fill history and calculate what the current point is
        {
            uint t_i = (last_checkpoint / WEEK) * WEEK;
            for (uint i = 0; i < 255; ++i) {
                // Hopefully it won't happen that this won't get used in 5 years!
                // If it does, users will be able to withdraw but vote weight will be broken
                t_i += WEEK;
                int128 d_slope = 0;
                if (t_i > block.timestamp) {
                    t_i = block.timestamp;
                } else {
                    d_slope = slope_changes[t_i];
                }
                last_point.bias -= last_point.slope * int128(int256(t_i - last_checkpoint));
                last_point.slope += d_slope;
                if (last_point.bias < 0) {
                    // This can happen
                    last_point.bias = 0;
                }
                if (last_point.slope < 0) {
                    // This cannot happen - just in case
                    last_point.slope = 0;
                }
                last_checkpoint = t_i;
                last_point.ts = t_i;
                last_point.blk = initial_last_point.blk + (block_slope * (t_i - initial_last_point.ts)) / MULTIPLIER;
                _epoch += 1;
                if (t_i == block.timestamp) {
                    last_point.blk = block.number;
                    break;
                } else {
                    point_history[_epoch] = last_point;
                }
            }
        }

        epoch = _epoch;
        // Now point_history is filled until t=now

        if (_tokenId != 0) {
            // If last point was in this block, the slope change has been applied already
            // But in such case we have 0 slope(s)
            last_point.slope += (u_new.slope - u_old.slope);
            last_point.bias += (u_new.bias - u_old.bias);
            if (last_point.slope < 0) {
                last_point.slope = 0;
            }
            if (last_point.bias < 0) {
                last_point.bias = 0;
            }
        }

        // Record the changed point into history
        point_history[_epoch] = last_point;

        if (_tokenId != 0) {
            // Schedule the slope changes (slope is going down)
            // We subtract new_user_slope from [new_locked.end]
            // and add old_user_slope to [old_locked.end]
            if (old_locked.end > block.timestamp) {
                // old_dslope was <something> - u_old.slope, so we cancel that
                old_dslope += u_old.slope;
                if (new_locked.end == old_locked.end) {
                    old_dslope -= u_new.slope; // It was a new deposit, not extension
                }
                slope_changes[old_locked.end] = old_dslope;
            }

            if (new_locked.end > block.timestamp) {
                if (new_locked.end > old_locked.end) {
                    new_dslope -= u_new.slope; // old slope disappeared at this point
                    slope_changes[new_locked.end] = new_dslope;
                }
                // else: we recorded it already in old_dslope
            }
            // Now handle user history
            uint user_epoch = user_point_epoch[_tokenId] + 1;

            user_point_epoch[_tokenId] = user_epoch;
            u_new.ts = block.timestamp;
            u_new.blk = block.number;
            user_point_history[_tokenId][user_epoch] = u_new;
        }
    }

    /// @notice Deposit and lock tokens for a user
    /// @param _tokenId NFT that holds lock
    /// @param _value Amount to deposit
    /// @param unlock_time New time when to unlock the tokens, or 0 if unchanged
    /// @param locked_balance Previous locked amount / timestamp
    /// @param deposit_type The type of deposit
    function _deposit_for(
        uint _tokenId,
        uint _value,
        uint unlock_time,
        LockedBalance memory locked_balance,
        DepositType deposit_type
    ) internal {
        LockedBalance memory _locked = locked_balance;
        uint supply_before = supply;

        supply = supply_before + _value;
        LockedBalance memory old_locked;
        (old_locked.amount, old_locked.end) = (_locked.amount, _locked.end);
        // Adding to existing lock, or if a lock is expired - creating a new one
        _locked.amount += int128(int256(_value));
        if (unlock_time != 0) {
            _locked.end = unlock_time;
        }
        locked[_tokenId] = _locked;

        // Possibilities:
        // Both old_locked.end could be current or expired (>/< block.timestamp)
        // value == 0 (extend lock) or value > 0 (add to lock or extend lock)
        // _locked.end > block.timestamp (always)
        _checkpoint(_tokenId, old_locked, _locked);

        address from = msg.sender;
        if (_value != 0 && deposit_type != DepositType.MERGE_TYPE && deposit_type != DepositType.SPLIT_TYPE ) {
            assert(IERC20(token).transferFrom(from, address(this), _value));
        }

        emit Deposit(from, _tokenId, _value, _locked.end, deposit_type, block.timestamp);
        emit Supply(supply_before, supply_before + _value);
    }

    function block_number() external view returns (uint) {
        return block.number;
    }

    /// @notice Record global data to checkpoint
    function checkpoint() external {
        _checkpoint(0, LockedBalance(0, 0), LockedBalance(0, 0));
    }

    /// @notice Deposit `_value` tokens for `_tokenId` and add to the lock
    /// @dev Anyone (even a smart contract) can deposit for someone else, but
    ///      cannot extend their locktime and deposit for a brand new user
    /// @param _tokenId lock NFT
    /// @param _value Amount to add to user's lock
    function deposit_for(uint _tokenId, uint _value) external nonreentrant {
        LockedBalance memory _locked = locked[_tokenId];

        require(_value > 0); // dev: need non-zero value
        require(_locked.amount > 0, 'No existing lock found');
        require(_locked.end > block.timestamp, 'Cannot add to expired lock. Withdraw');
        if(toggleMaxLock && msg.sender == getRewardsDistributor()){
            //maxlock
            _deposit_for(_tokenId, _value, (block.timestamp + MAXTIME) / WEEK * WEEK, _locked, DepositType.DEPOSIT_FOR_TYPE);
        }else{
            _deposit_for(_tokenId, _value, 0, _locked, DepositType.DEPOSIT_FOR_TYPE);
        }

    }

    /// @notice Deposit `_value` tokens for `_to` and lock for `_lock_duration`
    /// @param _value Amount to deposit
    /// @param _lock_duration Number of seconds to lock tokens for (rounded down to nearest week)
    /// @param _to Address to deposit
    function _create_lock(uint _value, uint _lock_duration, address _to) internal returns (uint) {
        uint unlock_time = (block.timestamp + _lock_duration) / WEEK * WEEK; // Locktime is rounded down to weeks

        require(_value > 0); // dev: need non-zero value
        require(unlock_time > block.timestamp, 'Can only lock until time in the future');
        require(unlock_time <= block.timestamp + MAXTIME, 'Voting lock can be 2 years max');

        ++tokenId;
        uint _tokenId = tokenId;
        _mint(_to, _tokenId);

        _deposit_for(_tokenId, _value, unlock_time, locked[_tokenId], DepositType.CREATE_LOCK_TYPE);
        return _tokenId;
    }

    /// @notice Deposit `_value` tokens for `msg.sender` and lock for `_lock_duration`
    /// @param _value Amount to deposit
    /// @param _lock_duration Number of seconds to lock tokens for (rounded down to nearest week)
    function create_lock(uint _value, uint _lock_duration) external nonreentrant returns (uint) {
        return _create_lock(_value, _lock_duration, msg.sender);
    }

    /// @notice Deposit `_value` tokens for `_to` and lock for `_lock_duration`
    /// @param _value Amount to deposit
    /// @param _lock_duration Number of seconds to lock tokens for (rounded down to nearest week)
    /// @param _to Address to deposit
    function create_lock_for(uint _value, uint _lock_duration, address _to) external nonreentrant returns (uint) {
        return _create_lock(_value, _lock_duration, _to);
    }

    /// @notice Deposit `_value` additional tokens for `_tokenId` without modifying the unlock time
    /// @param _value Amount of tokens to deposit and add to the lock
    function increase_amount(uint _tokenId, uint _value) external nonreentrant {
        assert(_isApprovedOrOwner(msg.sender, _tokenId));

        LockedBalance memory _locked = locked[_tokenId];

        assert(_value > 0); // dev: need non-zero value
        require(_locked.amount > 0, 'No existing lock found');
        require(_locked.end > block.timestamp, 'Cannot add to expired lock. Withdraw');

        _deposit_for(_tokenId, _value, 0, _locked, DepositType.INCREASE_LOCK_AMOUNT);
    }

    /// @notice Extend the unlock time for `_tokenId`
    /// @param _lock_duration New number of seconds until tokens unlock
    function increase_unlock_time(uint _tokenId, uint _lock_duration) external nonreentrant {
        assert(_isApprovedOrOwner(msg.sender, _tokenId));

        LockedBalance memory _locked = locked[_tokenId];
        uint unlock_time = (block.timestamp + _lock_duration) / WEEK * WEEK; // Locktime is rounded down to weeks

        require(_locked.end > block.timestamp, 'Lock expired');
        require(_locked.amount > 0, 'Nothing is locked');
        require(unlock_time > _locked.end, 'Can only increase lock duration');
        require(unlock_time <= block.timestamp + MAXTIME, 'Voting lock can be 2 years max');

        _deposit_for(_tokenId, 0, unlock_time, _locked, DepositType.INCREASE_UNLOCK_TIME);
    }

    /// @notice Withdraw all tokens for `_tokenId`
    /// @dev Only possible if the lock has expired
    function withdraw(uint _tokenId) external nonreentrant {
        assert(_isApprovedOrOwner(msg.sender, _tokenId));
        require(attachments[_tokenId] == 0 && !voted[_tokenId], "attached");

        LockedBalance memory _locked = locked[_tokenId];
        require(msg.sender == optionToken || block.timestamp >= _locked.end, "The lock didn't expire");
        uint value = uint(int256(_locked.amount));

        locked[_tokenId] = LockedBalance(0,0);
        uint supply_before = supply;
        supply = supply_before - value;

        // old_locked can have either expired <= timestamp or zero end
        // _locked has only 0 end
        // Both can have >= 0 amount
        _checkpoint(_tokenId, _locked, LockedBalance(0,0));

        assert(IERC20(token).transfer(msg.sender, value));

        // Burn the NFT
        _burn(_tokenId);

        emit Withdraw(msg.sender, _tokenId, value, block.timestamp);
        emit Supply(supply_before, supply_before - value);
    }

    /*///////////////////////////////////////////////////////////////
                           GAUGE VOTING STORAGE
    //////////////////////////////////////////////////////////////*/

    // The following ERC20/minime-compatible methods are not real balanceOf and supply!
    // They measure the weights for the purpose of voting, so they don't represent
    // real coins.

    /// @notice Binary search to estimate timestamp for block number
    /// @param _block Block to find
    /// @param max_epoch Don't go beyond this epoch
    /// @return Approximate timestamp for block
    function _find_block_epoch(uint _block, uint max_epoch) internal view returns (uint) {
        // Binary search
        uint _min = 0;
        uint _max = max_epoch;
        for (uint i = 0; i < 128; ++i) {
            // Will be always enough for 128-bit numbers
            if (_min >= _max) {
                break;
            }
            uint _mid = (_min + _max + 1) / 2;
            if (point_history[_mid].blk <= _block) {
                _min = _mid;
            } else {
                _max = _mid - 1;
            }
        }
        return _min;
    }

    /// @notice Get the current voting power for `_tokenId`
    /// @dev Adheres to the ERC20 `balanceOf` interface for Aragon compatibility
    /// @param _tokenId NFT for lock
    /// @param _t Epoch time to return voting power at
    /// @return User voting power
    function _balanceOfNFT(uint _tokenId, uint _t) internal view returns (uint) {
        uint _epoch = user_point_epoch[_tokenId];
        if (_epoch == 0) {
            return 0;
        } else {
            Point memory last_point = user_point_history[_tokenId][_epoch];
            last_point.bias -= last_point.slope * int128(int256(_t) - int256(last_point.ts));
            if (last_point.bias < 0) {
                last_point.bias = 0;
            }
            return uint(int256(last_point.bias));
        }
    }

    function balanceOfNFT(uint _tokenId) external view returns (uint) {
        if (ownership_change[_tokenId] == block.number) return 0;
        return _balanceOfNFT(_tokenId, block.timestamp);
    }

    function balanceOfNFTAt(uint _tokenId, uint _t) external view returns (uint) {
        return _balanceOfNFT(_tokenId, _t);
    }

    /// @notice Measure voting power of `_tokenId` at block height `_block`
    /// @dev Adheres to MiniMe `balanceOfAt` interface: https://github.com/Giveth/minime
    /// @param _tokenId User's wallet NFT
    /// @param _block Block to calculate the voting power at
    /// @return Voting power
    function _balanceOfAtNFT(uint _tokenId, uint _block) internal view returns (uint) {
        // Copying and pasting totalSupply code because Vyper cannot pass by
        // reference yet
        assert(_block <= block.number);

        // Binary search
        uint _min = 0;
        uint _max = user_point_epoch[_tokenId];
        for (uint i = 0; i < 128; ++i) {
            // Will be always enough for 128-bit numbers
            if (_min >= _max) {
                break;
            }
            uint _mid = (_min + _max + 1) / 2;
            if (user_point_history[_tokenId][_mid].blk <= _block) {
                _min = _mid;
            } else {
                _max = _mid - 1;
            }
        }

        Point memory upoint = user_point_history[_tokenId][_min];

        uint max_epoch = epoch;
        uint _epoch = _find_block_epoch(_block, max_epoch);
        Point memory point_0 = point_history[_epoch];
        uint d_block = 0;
        uint d_t = 0;
        if (_epoch < max_epoch) {
            Point memory point_1 = point_history[_epoch + 1];
            d_block = point_1.blk - point_0.blk;
            d_t = point_1.ts - point_0.ts;
        } else {
            d_block = block.number - point_0.blk;
            d_t = block.timestamp - point_0.ts;
        }
        uint block_time = point_0.ts;
        if (d_block != 0) {
            block_time += (d_t * (_block - point_0.blk)) / d_block;
        }

        upoint.bias -= upoint.slope * int128(int256(block_time - upoint.ts));
        if (upoint.bias >= 0) {
            return uint(uint128(upoint.bias));
        } else {
            return 0;
        }
    }

    function balanceOfAtNFT(uint _tokenId, uint _block) external view returns (uint) {
        return _balanceOfAtNFT(_tokenId, _block);
    }

    /// @notice Calculate total voting power at some point in the past
    /// @param _block Block to calculate the total voting power at
    /// @return Total voting power at `_block`
    function totalSupplyAt(uint _block) external view returns (uint) {
        assert(_block <= block.number);
        uint _epoch = epoch;
        uint target_epoch = _find_block_epoch(_block, _epoch);

        Point memory point = point_history[target_epoch];
        uint dt = 0;
        if (target_epoch < _epoch) {
            Point memory point_next = point_history[target_epoch + 1];
            if (point.blk != point_next.blk) {
                dt = ((_block - point.blk) * (point_next.ts - point.ts)) / (point_next.blk - point.blk);
            }
        } else {
            if (point.blk != block.number) {
                dt = ((_block - point.blk) * (block.timestamp - point.ts)) / (block.number - point.blk);
            }
        }
        // Now dt contains info on how far are we beyond point
        return _supply_at(point, point.ts + dt);
    }
    /// @notice Calculate total voting power at some point in the past
    /// @param point The point (bias/slope) to start search from
    /// @param t Time to calculate the total voting power at
    /// @return Total voting power at that time
    function _supply_at(Point memory point, uint t) internal view returns (uint) {
        Point memory last_point = point;
        uint t_i = (last_point.ts / WEEK) * WEEK;
        for (uint i = 0; i < 255; ++i) {
            t_i += WEEK;
            int128 d_slope = 0;
            if (t_i > t) {
                t_i = t;
            } else {
                d_slope = slope_changes[t_i];
            }
            last_point.bias -= last_point.slope * int128(int256(t_i - last_point.ts));
            if (t_i == t) {
                break;
            }
            last_point.slope += d_slope;
            last_point.ts = t_i;
        }

        if (last_point.bias < 0) {
            last_point.bias = 0;
        }
        return uint(uint128(last_point.bias));
    }

    function totalSupply() external view returns (uint) {
        return totalSupplyAtT(block.timestamp);
    }

    function getRewardsDistributor() internal view returns (address) {
        return IMinter(IVoter(voter).minter())._rewards_distributor();
    }

    /// @notice Calculate total voting power
    /// @dev Adheres to the ERC20 `totalSupply` interface for Aragon compatibility
    /// @return Total voting power
    function totalSupplyAtT(uint t) public view returns (uint) {
        uint _epoch = epoch;
        Point memory last_point = point_history[_epoch];
        return _supply_at(last_point, t);
    }

    /*///////////////////////////////////////////////////////////////
                            GAUGE VOTING LOGIC
    //////////////////////////////////////////////////////////////*/

    mapping(uint => uint) public attachments;
    mapping(uint => bool) public voted;

    function setVoter(address _voter) external {
        require(msg.sender == team);
        voter = _voter;
    }

    function setToggleMaxLock(bool _newValue) external {
        require(msg.sender == team);
        toggleMaxLock = _newValue;
    }

    function voting(uint _tokenId) external {
        require(msg.sender == voter);
        voted[_tokenId] = true;
    }

    function abstain(uint _tokenId) external {
        require(msg.sender == voter);
        voted[_tokenId] = false;
    }

    function attach(uint _tokenId) external {
        require(msg.sender == voter);
        attachments[_tokenId] = attachments[_tokenId] + 1;
    }

    function detach(uint _tokenId) external {
        require(msg.sender == voter);
        attachments[_tokenId] = attachments[_tokenId] - 1;
    }

    function merge(uint _from, uint _to) external {
        require(attachments[_from] == 0 && !voted[_from], "attached");
        require(_from != _to);
        require(_isApprovedOrOwner(msg.sender, _from));
        require(_isApprovedOrOwner(msg.sender, _to));

        LockedBalance memory _locked0 = locked[_from];
        LockedBalance memory _locked1 = locked[_to];
        uint value0 = uint(int256(_locked0.amount));
        uint end = _locked0.end >= _locked1.end ? _locked0.end : _locked1.end;

        locked[_from] = LockedBalance(0, 0);
        _checkpoint(_from, _locked0, LockedBalance(0, 0));
        _burn(_from);
        _deposit_for(_to, value0, end, _locked1, DepositType.MERGE_TYPE);
    }


    /**
     * @notice split NFT into multiple
     * @param amounts   % of split
     * @param _tokenId  NFTs ID
     */
    function split(uint[] memory amounts, uint _tokenId) external {
        
        // check permission and vote
        require(attachments[_tokenId] == 0 && !voted[_tokenId], "attached");
        require(_isApprovedOrOwner(msg.sender, _tokenId));

        // save old data and totalWeight
        address _to = idToOwner[_tokenId];
        LockedBalance memory _locked = locked[_tokenId];
        uint end = _locked.end;
        uint value = uint(int256(_locked.amount));
        require(value > 0); // dev: need non-zero value
        
        // reset supply, _deposit_for increase it
        supply = supply - value;

        uint i;
        uint totalWeight = 0;
        for(i = 0; i < amounts.length; i++){
            totalWeight += amounts[i];
        }

        // remove old data
        locked[_tokenId] = LockedBalance(0, 0);
        _checkpoint(_tokenId, _locked, LockedBalance(0, 0));
        _burn(_tokenId);

        // save end
        uint unlock_time = end;
        require(unlock_time > block.timestamp, 'Can only lock until time in the future');
        require(unlock_time <= block.timestamp + MAXTIME, 'Voting lock can be 2 years max');
        
        // mint 
        uint _value = 0;
        for(i = 0; i < amounts.length; i++){   
            ++tokenId;
            _tokenId = tokenId;
            _mint(_to, _tokenId);
            _value = value * amounts[i] / totalWeight;
            _deposit_for(_tokenId, _value, unlock_time, locked[_tokenId], DepositType.SPLIT_TYPE);
        }     

    }

    /*///////////////////////////////////////////////////////////////
                            DAO VOTING STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    /// @notice A record of each accounts delegate
    mapping(address => address) private _delegates;
    uint public constant MAX_DELEGATES = 1024; // avoid too much gas

    /// @notice A record of delegated token checkpoints for each account, by index
    mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping(address => uint32) public numCheckpoints;

    /// @notice A record of states for signing / validating signatures
    mapping(address => uint) public nonces;

    /**
     * @notice Overrides the standard `Comp.sol` delegates mapping to return
     * the delegator's own address if they haven't delegated.
     * This avoids having to delegate to oneself.
     */
    function delegates(address delegator) public view returns (address) {
        address current = _delegates[delegator];
        return current == address(0) ? delegator : current;
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getVotes(address account) external view returns (uint) {
        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }
        uint[] storage _tokenIds = checkpoints[account][nCheckpoints - 1].tokenIds;
        uint votes = 0;
        for (uint i = 0; i < _tokenIds.length; i++) {
            uint tId = _tokenIds[i];
            votes = votes + _balanceOfNFT(tId, block.timestamp);
        }
        return votes;
    }

    function getPastVotesIndex(address account, uint timestamp) public view returns (uint32) {
        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }
        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].timestamp <= timestamp) {
            return (nCheckpoints - 1);
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].timestamp > timestamp) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint storage cp = checkpoints[account][center];
            if (cp.timestamp == timestamp) {
                return center;
            } else if (cp.timestamp < timestamp) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return lower;
    }

    function getPastVotes(address account, uint timestamp)
        public
        view
        returns (uint)
    {
        uint32 _checkIndex = getPastVotesIndex(account, timestamp);
        // Sum votes
        uint[] storage _tokenIds = checkpoints[account][_checkIndex].tokenIds;
        uint votes = 0;
        for (uint i = 0; i < _tokenIds.length; i++) {
            uint tId = _tokenIds[i];
            // Use the provided input timestamp here to get the right decay
            votes = votes + _balanceOfNFT(tId, timestamp);
        }
        return votes;
    }

    function getPastTotalSupply(uint256 timestamp) external view returns (uint) {
        return totalSupplyAtT(timestamp);
    }

    /*///////////////////////////////////////////////////////////////
                             DAO VOTING LOGIC
    //////////////////////////////////////////////////////////////*/

    function _moveTokenDelegates(
        address srcRep,
        address dstRep,
        uint _tokenId
    ) internal {
        if (srcRep != dstRep && _tokenId > 0) {
            if (srcRep != address(0)) {
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint[] storage srcRepOld = srcRepNum > 0
                    ? checkpoints[srcRep][srcRepNum - 1].tokenIds
                    : checkpoints[srcRep][0].tokenIds;
                uint32 nextSrcRepNum = _findWhatCheckpointToWrite(srcRep);
                uint[] storage srcRepNew = checkpoints[srcRep][
                    nextSrcRepNum
                ].tokenIds;
                // All the same except _tokenId
                for (uint i = 0; i < srcRepOld.length; i++) {
                    uint tId = srcRepOld[i];
                    if (tId != _tokenId) {
                        srcRepNew.push(tId);
                    }
                }

                numCheckpoints[srcRep] = srcRepNum + 1;
            }

            if (dstRep != address(0)) {
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint[] storage dstRepOld = dstRepNum > 0
                    ? checkpoints[dstRep][dstRepNum - 1].tokenIds
                    : checkpoints[dstRep][0].tokenIds;
                uint32 nextDstRepNum = _findWhatCheckpointToWrite(dstRep);
                uint[] storage dstRepNew = checkpoints[dstRep][
                    nextDstRepNum
                ].tokenIds;
                // All the same plus _tokenId
                require(
                    dstRepOld.length + 1 <= MAX_DELEGATES,
                    "dstRep would have too many tokenIds"
                );
                for (uint i = 0; i < dstRepOld.length; i++) {
                    uint tId = dstRepOld[i];
                    dstRepNew.push(tId);
                }
                dstRepNew.push(_tokenId);

                numCheckpoints[dstRep] = dstRepNum + 1;
            }
        }
    }

    function _findWhatCheckpointToWrite(address account)
        internal
        view
        returns (uint32)
    {
        uint _timestamp = block.timestamp;
        uint32 _nCheckPoints = numCheckpoints[account];

        if (
            _nCheckPoints > 0 &&
            checkpoints[account][_nCheckPoints - 1].timestamp == _timestamp
        ) {
            return _nCheckPoints - 1;
        } else {
            return _nCheckPoints;
        }
    }

    function _moveAllDelegates(
        address owner,
        address srcRep,
        address dstRep
    ) internal {
        // You can only redelegate what you own
        if (srcRep != dstRep) {
            if (srcRep != address(0)) {
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint[] storage srcRepOld = srcRepNum > 0
                    ? checkpoints[srcRep][srcRepNum - 1].tokenIds
                    : checkpoints[srcRep][0].tokenIds;
                uint32 nextSrcRepNum = _findWhatCheckpointToWrite(srcRep);
                uint[] storage srcRepNew = checkpoints[srcRep][
                    nextSrcRepNum
                ].tokenIds;
                // All the same except what owner owns
                for (uint i = 0; i < srcRepOld.length; i++) {
                    uint tId = srcRepOld[i];
                    if (idToOwner[tId] != owner) {
                        srcRepNew.push(tId);
                    }
                }

                numCheckpoints[srcRep] = srcRepNum + 1;
            }

            if (dstRep != address(0)) {
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint[] storage dstRepOld = dstRepNum > 0
                    ? checkpoints[dstRep][dstRepNum - 1].tokenIds
                    : checkpoints[dstRep][0].tokenIds;
                uint32 nextDstRepNum = _findWhatCheckpointToWrite(dstRep);
                uint[] storage dstRepNew = checkpoints[dstRep][
                    nextDstRepNum
                ].tokenIds;
                uint ownerTokenCount = ownerToNFTokenCount[owner];
                require(
                    dstRepOld.length + ownerTokenCount <= MAX_DELEGATES,
                    "dstRep would have too many tokenIds"
                );
                // All the same
                for (uint i = 0; i < dstRepOld.length; i++) {
                    uint tId = dstRepOld[i];
                    dstRepNew.push(tId);
                }
                // Plus all that's owned
                for (uint i = 0; i < ownerTokenCount; i++) {
                    uint tId = ownerToNFTokenIdList[owner][i];
                    dstRepNew.push(tId);
                }

                numCheckpoints[dstRep] = dstRepNum + 1;
            }
        }
    }

    function _delegate(address delegator, address delegatee) internal {
        /// @notice differs from `_delegate()` in `Comp.sol` to use `delegates` override method to simulate auto-delegation
        address currentDelegate = delegates(delegator);

        _delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);
        _moveAllDelegates(delegator, currentDelegate, delegatee);
    }

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegatee The address to delegate votes to
     */
    function delegate(address delegatee) public {
        if (delegatee == address(0)) delegatee = msg.sender;
        return _delegate(msg.sender, delegatee);
    }

    function delegateBySig(
        address delegatee,
        uint nonce,
        uint expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public {
        require(delegatee != msg.sender);
        require(delegatee != address(0));
        
        bytes32 domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name)),
                keccak256(bytes(version)),
                block.chainid,
                address(this)
            )
        );
        bytes32 structHash = keccak256(
            abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry)
        );
        bytes32 digest = keccak256(
            abi.encodePacked("\x19\x01", domainSeparator, structHash)
        );
        address signatory = ecrecover(digest, v, r, s);
        require(
            signatory != address(0),
            "VotingEscrow::delegateBySig: invalid signature"
        );
        require(
            nonce == nonces[signatory]++,
            "VotingEscrow::delegateBySig: invalid nonce"
        );
        require(
            block.timestamp <= expiry,
            "VotingEscrow::delegateBySig: signature expired"
        );
        return _delegate(signatory, delegatee);
    }
}