// File: contracts/utils/TransferHelper.sol


pragma solidity ^0.8.0;

/**
    helper methods for interacting with ERC20 tokens that do not consistently return true/false
    with the addition of a transfer function to send eth or an erc20 token
*/
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }
    
    // sends ETH or an erc20 token
    function safeTransferBaseToken(address token, address payable to, uint value, bool isERC20) internal {
        if (!isERC20) {
            to.transfer(value);
        } else {
            (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
            require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
        }
    }
}
// File: contracts/interfaces/IUniswapV2Factory.sol


pragma solidity ^0.8.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// File: contracts/interfaces/IUniswapV2Pair.sol


pragma solidity ^0.8.0;

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

// File: contracts/interfaces/ISignataRight.sol


pragma solidity ^0.8.0;

interface ISignataRight {
    function holdsTokenOfSchema(address holder, uint256 schemaId) external view returns (bool);
}
// File: contracts/@openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts v4.4.1 (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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: contracts/@openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: contracts/@openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: contracts/@openzeppelin/contracts/utils/math/SafeMath.sol


// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// File: contracts/@openzeppelin/contracts/utils/structs/EnumerableSet.sol


// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.
 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 *  In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// File: contracts/UniswapV2Locker.sol


pragma solidity ^0.8.0;









contract UniswapV2Locker is Ownable, ReentrancyGuard {
    using SafeMath for uint256;
    using EnumerableSet for EnumerableSet.AddressSet;

    IUniswapV2Factory public uniswapFactory;

    struct UserInfo {
        EnumerableSet.AddressSet lockedTokens; // records all tokens the user has locked
        mapping(address => uint256[]) locksForToken; // map erc20 address to lock id for that token
    }

    struct Lock {
        uint256 lockDate; // the date the token was locked
        uint256 amount; // the amount of tokens still locked (initialAmount minus withdrawls)
        uint256 initialAmount; // the initial lock amount
        uint256 unlockDate; // the date the token can be withdrawn
        uint256 lockID; // lockID nonce per uni pair
        address owner;
        uint256 schemaId;
    }

    mapping(address => UserInfo) private users;

    EnumerableSet.AddressSet private lockedTokens;
    mapping(address => Lock[]) public locks; // map univ2 pair to all its locks

    uint256 public nativeFee; // eth fee for creating a lock

    address payable feeAddress;

    // Signata Integration
    ISignataRight public signataRight;

    event Deposited(
        address lpToken,
        address user,
        uint256 amount,
        uint256 lockDate,
        uint256 unlockDate,
        uint256 schemaId
    );
    event Withdrawn(address lpToken, uint256 amount);
    event SignataRightUpdated(address newSignataRight);
    event LockTransferred(address previousOwner, address newOwner);
    event Relocked(uint256 lockId, uint256 unlockDate);
    event LockSplit(uint256 lockId, uint256 amount);

    constructor(IUniswapV2Factory _uniswapFactory, ISignataRight _signataRight) {
        feeAddress = payable(msg.sender);
        nativeFee = 1e18;
        uniswapFactory = _uniswapFactory;
        signataRight = _signataRight;
    }

    function setFeeAddress(address payable _feeAddress) public onlyOwner {
        feeAddress = _feeAddress;
    }

    function setFee(uint256 _nativeFee) public onlyOwner {
        nativeFee = _nativeFee;
    }

    /**
     * @notice Creates a new lock
     * @param _lpToken the univ2 token address
     * @param _amount amount of LP tokens to lock
     * @param _unlock_date the unix timestamp (in seconds) until unlock
     * @param _withdrawer the user who can withdraw liquidity once the lock expires.
     */
    function lockTokens(
        address _lpToken,
        uint256 _amount,
        uint256 _unlock_date,
        address payable _withdrawer,
        uint256 _schemaId
    ) external payable nonReentrant {
        require(_unlock_date < 10000000000, "lockTokens::Invalid timestamp"); // prevents errors when timestamp entered in milliseconds
        require(_amount > 0, "lockTokens::Amount needs to be greater than 0");

        // ensure this pair is a univ2 pair by querying the factory
        IUniswapV2Pair lpair = IUniswapV2Pair(address(_lpToken));
        address factoryPairAddress = uniswapFactory.getPair(
            lpair.token0(),
            lpair.token1()
        );
        require(factoryPairAddress == address(_lpToken), "lockTokens::Invalid LP pair");

        // check holding NFT of schema
        if (_schemaId > 0) {
            require(
                signataRight.holdsTokenOfSchema(msg.sender, _schemaId),
                "lockTokens::Sender does not hold NFT of schema"
            );
        }

        TransferHelper.safeTransferFrom(
            _lpToken,
            address(msg.sender),
            address(this),
            _amount
        );

        require(msg.value == nativeFee, "lockTokens::Fee not paid");
        feeAddress.transfer(nativeFee);

        Lock memory lock;
        lock.lockDate = block.timestamp;
        lock.amount = _amount;
        lock.initialAmount = _amount;
        lock.unlockDate = _unlock_date;
        lock.lockID = locks[_lpToken].length;
        lock.owner = _withdrawer;
        lock.schemaId = _schemaId;

        // record the lock for the univ2pair
        locks[_lpToken].push(lock);
        lockedTokens.add(_lpToken);

        // record the lock for the user
        UserInfo storage user = users[_withdrawer];
        user.lockedTokens.add(_lpToken);
        uint256[] storage user_locks = user.locksForToken[_lpToken];
        user_locks.push(lock.lockID);

        emit Deposited(
            _lpToken,
            msg.sender,
            lock.amount,
            lock.lockDate,
            lock.unlockDate,
            lock.schemaId
        );
    }

    /**
     * @notice extend a lock with a new unlock date, _index and _lockID ensure the correct lock is changed
     * this prevents errors when a user performs multiple tx per block possibly with varying gas prices
     */
    function relock(
        address _lpToken,
        uint256 _index,
        uint256 _lockID,
        uint256 _unlock_date
    ) external nonReentrant {
        require(_unlock_date < 10000000000, "relock::Invalid timestamp"); // prevents errors when timestamp entered in milliseconds
        uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];
        Lock storage userLock = locks[_lpToken][lockID];
        require(
            lockID == _lockID && userLock.owner == msg.sender,
            "relock::Lock mismatch"
        ); // ensures correct lock is affected
        require(userLock.unlockDate < _unlock_date, "relock::Invalid date");

        // check holding NFT of schema
        if (userLock.schemaId > 0) {
            require(
                signataRight.holdsTokenOfSchema(msg.sender, userLock.schemaId),
                "relock::Sender does not hold NFT of schema"
            );
        }

        userLock.amount = userLock.amount;
        userLock.unlockDate = _unlock_date;

        emit Relocked(_lockID, _unlock_date);
    }

    /**
     * @notice withdraw a specified amount from a lock. _index and _lockID ensure the correct lock is changed
     * this prevents errors when a user performs multiple tx per block possibly with varying gas prices
     */
    function withdraw(
        address _lpToken,
        uint256 _index,
        uint256 _lockID,
        uint256 _amount
    ) external nonReentrant {
        require(_amount > 0, "withdraw::Amount needs to be greater than 0");
        uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];
        Lock storage userLock = locks[_lpToken][lockID];
        require(
            lockID == _lockID && userLock.owner == msg.sender,
            "withdraw::Lock mismatch"
        ); // ensures correct lock is affected
        require(userLock.unlockDate < block.timestamp, "withdraw::Lock not expired");
        userLock.amount = userLock.amount.sub(_amount);

        // check holding NFT of schema
        if (userLock.schemaId > 0) {
            require(
                signataRight.holdsTokenOfSchema(msg.sender, userLock.schemaId),
                "withdraw::Sender does not hold NFT of schema"
            );
        }

        // clean user storage
        if (userLock.amount == 0) {
            uint256[] storage userLocks = users[msg.sender].locksForToken[
                _lpToken
            ];
            userLocks[_index] = userLocks[userLocks.length - 1];
            userLocks.pop();
            if (userLocks.length == 0) {
                users[msg.sender].lockedTokens.remove(_lpToken);
            }
        }

        TransferHelper.safeTransfer(_lpToken, msg.sender, _amount);
        emit Withdrawn(_lpToken, _amount);
    }

    /**
     * @notice increase the amount of tokens per a specific lock, this is preferable to creating a new lock, less fees, and faster loading on our live block explorer
     */
    function incrementLock(
        address _lpToken,
        uint256 _index,
        uint256 _lockID,
        uint256 _amount
    ) external nonReentrant {
        require(_amount > 0, "incrementLock::Amount needs to be greater than 0");
        uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];
        Lock storage userLock = locks[_lpToken][lockID];
        require(
            lockID == _lockID && userLock.owner == msg.sender,
            "incrementLock::Lock mismatch"
        ); // ensures correct lock is affected

        // check holding NFT of schema
        if (userLock.schemaId > 0) {
            require(
                signataRight.holdsTokenOfSchema(msg.sender, userLock.schemaId),
                "incrementLock::Sender does not hold NFT of schema"
            );
        }

        TransferHelper.safeTransferFrom(
            _lpToken,
            address(msg.sender),
            address(this),
            _amount
        );

        userLock.amount = userLock.amount.add(_amount);
        emit Deposited(
            _lpToken,
            msg.sender,
            _amount,
            userLock.lockDate,
            userLock.unlockDate,
            userLock.schemaId
        );
    }

    /**
     * @notice split a lock into two seperate locks, useful when a lock is about to expire and youd like to relock a portion
     * and withdraw a smaller portion
     */
    function splitLock(
        address _lpToken,
        uint256 _index,
        uint256 _lockID,
        uint256 _amount
    ) external payable nonReentrant {
        require(_amount > 0, "splitLock::Amount needs to be greater than 0");
        uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];
        Lock storage userLock = locks[_lpToken][lockID];
        require(
            lockID == _lockID && userLock.owner == msg.sender,
            "splitLock::Lock Mismatch"
        ); // ensures correct lock is affected

        // check holding NFT of schema
        if (userLock.schemaId > 0) {
            require(
                signataRight.holdsTokenOfSchema(msg.sender, userLock.schemaId),
                "splitLock::Sender does not hold NFT of schema"
            );
        }

        userLock.amount = userLock.amount.sub(_amount);

        Lock memory lock;
        lock.lockDate = userLock.lockDate;
        lock.amount = _amount;
        lock.initialAmount = _amount;
        lock.unlockDate = userLock.unlockDate;
        lock.lockID = locks[_lpToken].length;
        lock.owner = msg.sender;

        // record the lock for the univ2pair
        locks[_lpToken].push(lock);

        // record the lock for the user
        UserInfo storage user = users[msg.sender];
        uint256[] storage user_locks = user.locksForToken[_lpToken];
        user_locks.push(lock.lockID);

        emit LockSplit(_lockID, _amount);
    }

    /**
     * @notice transfer a lock to a new owner
     */
    function transferLockOwnership(
        address _lpToken,
        uint256 _index,
        uint256 _lockID,
        address payable _newOwner
    ) external {
        require(msg.sender != _newOwner, "transferLockOwnership::Cannot transfer to self");
        uint256 lockID = users[msg.sender].locksForToken[_lpToken][_index];
        Lock storage lock = locks[_lpToken][lockID];
        require(
            lockID == _lockID && lock.owner == msg.sender,
            "transferLockOwnership::Lock Mismatch"
        ); // ensures correct lock is affected

        // check holding NFT of schema
        if (lock.schemaId > 0) {
            require(
                signataRight.holdsTokenOfSchema(
                    _newOwner,
                    lock.schemaId
                ),
                "transferLockOwnership::New owner does not hold NFT of schema"
            );
        }

        // record the lock for the new Owner
        UserInfo storage user = users[_newOwner];
        user.lockedTokens.add(_lpToken);
        uint256[] storage user_locks = user.locksForToken[_lpToken];
        user_locks.push(lock.lockID);

        // remove the lock from the old owner
        uint256[] storage userLocks = users[msg.sender].locksForToken[_lpToken];
        userLocks[_index] = userLocks[userLocks.length - 1];
        userLocks.pop();
        if (userLocks.length == 0) {
            users[msg.sender].lockedTokens.remove(_lpToken);
        }
        lock.owner = _newOwner;

        emit LockTransferred(msg.sender, _newOwner);
    }

    function getNumLocksForToken(address _lpToken)
        external
        view
        returns (uint256)
    {
        return locks[_lpToken].length;
    }

    function getNumLockedTokens() external view returns (uint256) {
        return lockedTokens.length();
    }

    function getLockedTokenAtIndex(uint256 _index)
        external
        view
        returns (address)
    {
        return lockedTokens.at(_index);
    }

    // user functions
    function getUserNumLockedTokens(address _user)
        external
        view
        returns (uint256)
    {
        UserInfo storage user = users[_user];
        return user.lockedTokens.length();
    }

    function getUserLockedTokenAtIndex(address _user, uint256 _index)
        external
        view
        returns (address)
    {
        UserInfo storage user = users[_user];
        return user.lockedTokens.at(_index);
    }

    function getUserNumLocksForToken(address _user, address _lpToken)
        external
        view
        returns (uint256)
    {
        UserInfo storage user = users[_user];
        return user.locksForToken[_lpToken].length;
    }

    function getUserLockForTokenAtIndex(
        address _user,
        address _lpToken,
        uint256 _index
    )
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256,
            address
        )
    {
        uint256 lockID = users[_user].locksForToken[_lpToken][_index];
        Lock storage lock = locks[_lpToken][lockID];
        return (
            lock.lockDate,
            lock.amount,
            lock.initialAmount,
            lock.unlockDate,
            lock.lockID,
            lock.schemaId,
            lock.owner
        );
    }

    function updateSignataRight(address _signataRight) public onlyOwner {
        signataRight = ISignataRight(_signataRight);
        emit SignataRightUpdated(_signataRight);
    }
}