// File: contracts/CopperProxy.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
import {TransferHelper} from "@uniswap/lib/contracts/libraries/TransferHelper.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

interface LBPFactory {
    function create(
        string memory name,
        string memory symbol,
        address[] memory tokens,
        uint256[] memory weights,
        uint256 swapFeePercentage,
        address owner,
        bool swapEnabledOnStart
    ) external returns (address);
}

interface Vault {
    struct JoinPoolRequest {
        address[] assets;
        uint256[] maxAmountsIn;
        bytes userData;
        bool fromInternalBalance;
    }

    struct ExitPoolRequest {
        address[] assets;
        uint256[] minAmountsOut;
        bytes userData;
        bool toInternalBalance;
    }

    function joinPool(
        bytes32 poolId,
        address sender,
        address recipient,
        JoinPoolRequest memory request
    ) external;

    function exitPool(
        bytes32 poolId,
        address sender,
        address recipient,
        ExitPoolRequest memory request
    ) external;

    function getPoolTokens(bytes32 poolId)
        external
        view
        returns (
            address[] memory tokens,
            uint256[] memory balances,
            uint256 lastChangeBlock
        );
}

interface LBP {
    function updateWeightsGradually(
        uint256 startTime,
        uint256 endTime,
        uint256[] memory endWeights
    ) external;

    function setSwapEnabled(bool swapEnabled) external;

    function getPoolId() external returns (bytes32 poolID);
}

/// @title CopperProxy
/// @notice This contract allows for simplified creation and management of Balancer LBPs
/// It currently supports:
/// - LBPs with 2 tokens
/// - Withdrawl of the full liquidity at once
/// - Charging a fee on the amount raised
contract CopperProxy is Ownable {
    using EnumerableSet for EnumerableSet.AddressSet;

    struct PoolData {
        address owner;
        bool isCorrectOrder;
        uint256 fundTokenInputAmount;
    }

    mapping(address => PoolData) private _poolData;
    EnumerableSet.AddressSet private _pools;

    address public constant VAULT = address(0xBA12222222228d8Ba445958a75a0704d566BF2C8);
    address public immutable _LBPFactoryAddress;
    uint256 public immutable _feeBPS;
    address public _feeRecipient;

    constructor(
        uint256 feeBPS,
        address feeRecipient,
        address LBPFactoryAddress
    ) {
        _feeBPS = feeBPS;
        _feeRecipient = feeRecipient;
        _LBPFactoryAddress = LBPFactoryAddress;
    }

    // Events
    event PoolCreated(
        address indexed pool,
        bytes32 poolId,
        string  name,
        string  symbol,
        address[]  tokens,
        uint256[]  weights,
        uint256 swapFeePercentage,
        address owner,
        bool swapEnabledOnStart
    );

    event JoinedPool(address indexed pool, address[] tokens, uint256[] amounts, bytes userData);

    event GradualWeightUpdateScheduled(address indexed pool, uint256 startTime, uint256 endTime, uint256[] endWeights);

    event SwapEnabledSet(address indexed pool, bool swapEnabled);

    event TransferedPoolOwnership(address indexed pool, address previousOwner, address newOwner);

    event ExitedPool(address indexed pool, address[] tokens, uint256[] minAmountsOut, bytes userData);

    event TransferedFee(address indexed pool, address token, address feeRecipient, uint256 feeAmount);

    event TransferedToken(address indexed pool, address token, address to, uint256 amount);

    event ChangedFeeRecipient(address previousRecipient, address newRecipient);

    event Skimmed(address token, address to, uint256 balance);

    // Pool access control
    modifier onlyPoolOwner(address pool) {
        require(msg.sender == _poolData[pool].owner, "!owner");
        _;
    }

    function isPool(address pool) external view returns (bool valid) {
        return _pools.contains(pool);
    }

    function poolCount() external view returns (uint256 count) {
        return _pools.length();
    }

    function getPoolAt(uint256 index) external view returns (address pool) {
        return _pools.at(index);
    }

    function getPools() external view returns (address[] memory pools) {
        return _pools.values();
    }

    function getPoolData(address pool) external view returns (PoolData memory poolData) {
        return _poolData[pool];
    }

    function getBPTTokenBalance(address pool) external view returns (uint256 bptBalance) {
        return IERC20(pool).balanceOf(address(this));
    }

    struct PoolConfig {
        string name;
        string symbol;
        address[] tokens;
        uint256[] amounts;
        uint256[] weights;
        uint256[] endWeights;
        bool isCorrectOrder;
        uint256 swapFeePercentage;
        bytes userData;
        uint256 startTime;
        uint256 endTime;
    }

    function createAuction(PoolConfig memory poolConfig) external returns (address) {
        // 1: deposit tokens and approve vault
        require(poolConfig.tokens.length == 2, "only two tokens");
        TransferHelper.safeTransferFrom(poolConfig.tokens[0], msg.sender, address(this), poolConfig.amounts[0]);
        TransferHelper.safeTransferFrom(poolConfig.tokens[1], msg.sender, address(this), poolConfig.amounts[1]);
        TransferHelper.safeApprove(poolConfig.tokens[0], VAULT, poolConfig.amounts[0]);
        TransferHelper.safeApprove(poolConfig.tokens[1], VAULT, poolConfig.amounts[1]);

        // 2: pool creation
        address pool = LBPFactory(_LBPFactoryAddress).create(
            poolConfig.name,
            poolConfig.symbol,
            poolConfig.tokens,
            poolConfig.weights,
            poolConfig.swapFeePercentage,
            address(this), // owner set to this proxy
            false // swaps disabled on start
        );

        bytes32 poolId = LBP(pool).getPoolId();
        emit PoolCreated(
            pool,
            poolId,
            poolConfig.name,
            poolConfig.symbol,
            poolConfig.tokens,
            poolConfig.weights,
            poolConfig.swapFeePercentage,
            address(this),
            false    
        );

        // 3: store pool data
        _poolData[pool] = PoolData(
            msg.sender,
            poolConfig.isCorrectOrder,
            poolConfig.amounts[poolConfig.isCorrectOrder ? 0 : 1]
        );
        require(_pools.add(pool), "exists already");

        // 4: deposit tokens into pool
        Vault(VAULT).joinPool(
            poolId,
            address(this), // sender
            address(this), // recipient
            Vault.JoinPoolRequest(poolConfig.tokens, poolConfig.amounts, poolConfig.userData, false)
        );
        emit JoinedPool(pool, poolConfig.tokens, poolConfig.amounts, poolConfig.userData);

        // 5: configure weights
        LBP(pool).updateWeightsGradually(poolConfig.startTime, poolConfig.endTime, poolConfig.endWeights);
        emit GradualWeightUpdateScheduled(pool, poolConfig.startTime, poolConfig.endTime, poolConfig.endWeights);

        return pool;
    }

    function setSwapEnabled(address pool, bool swapEnabled) external onlyPoolOwner(pool) {
        LBP(pool).setSwapEnabled(swapEnabled);
        emit SwapEnabledSet(pool, swapEnabled);
    }

    function transferPoolOwnership(address pool, address newOwner) external onlyPoolOwner(pool) {
        address previousOwner = _poolData[pool].owner;
        _poolData[pool].owner = newOwner;
        emit TransferedPoolOwnership(pool, previousOwner, newOwner);
    }

    enum ExitKind {
        EXACT_BPT_IN_FOR_ONE_TOKEN_OUT,
        EXACT_BPT_IN_FOR_TOKENS_OUT,
        BPT_IN_FOR_EXACT_TOKENS_OUT
    }

    /**
     * Exit a pool, burn the BPT token and transfer back the tokens.
     * If maxBPTTokenOut is passed as 0, the function will use the total balance available for the BPT token.
     * If maxBPTTokenOut is between 0 and the total of BPT available, that will be the amount used to burn.
     * maxBPTTokenOut must be grader or equal than 0
     */
    function exitPool(address pool, uint256[] calldata minAmountsOut, uint256 maxBPTTokenOut) external onlyPoolOwner(pool) {
        // 1. Get pool data
        bytes32 poolId = LBP(pool).getPoolId();
        (address[] memory poolTokens, , ) = Vault(VAULT).getPoolTokens(poolId);
        require(poolTokens.length == minAmountsOut.length, "invalid input length");
        PoolData memory poolData = _poolData[pool];

        // 2. Specify the exact BPT amount to burn
        uint256 bptToBurn;
        uint256 bptBalance = IERC20(pool).balanceOf(address(this));
        require(maxBPTTokenOut <= bptBalance, "Not enough BPT token amount");
        require(bptBalance > 0, "invalid pool");
        if (maxBPTTokenOut == 0 ) {
            bptToBurn = bptBalance;
        } else {
            bptToBurn = maxBPTTokenOut;
        }

        bytes memory userData = abi.encode(ExitKind.EXACT_BPT_IN_FOR_TOKENS_OUT, bptToBurn);
        Vault.ExitPoolRequest memory exitRequest = Vault.ExitPoolRequest(poolTokens, minAmountsOut, userData, false);

        // 3. Exit pool and keep tokens in contract
        Vault(VAULT).exitPool(poolId, address(this), payable(address(this)), exitRequest);
        emit ExitedPool(pool, poolTokens, minAmountsOut, userData);

        // 4. Calculate and transfer fee to recipient
        address fundToken = poolTokens[poolData.isCorrectOrder ? 0 : 1];
        uint256 fundTokenBalance = IERC20(fundToken).balanceOf(address(this));
        if (fundTokenBalance > poolData.fundTokenInputAmount) {
            uint256 feeAmount = ((fundTokenBalance - poolData.fundTokenInputAmount) * _feeBPS) / 10_000;
            TransferHelper.safeTransfer(fundToken, _feeRecipient, feeAmount);
            emit TransferedFee(pool, fundToken, _feeRecipient, feeAmount);
        }

        // 5. Transfer to user
        uint256 firstTokenBalance = IERC20(poolTokens[0]).balanceOf(address(this));
        TransferHelper.safeTransfer(
            poolTokens[0],
            msg.sender,
            firstTokenBalance
        );
        emit TransferedToken(pool, poolTokens[0], msg.sender, firstTokenBalance);

        uint256 secondTokenBalance = IERC20(poolTokens[1]).balanceOf(address(this));
        TransferHelper.safeTransfer(
            poolTokens[1],
            msg.sender,
            secondTokenBalance
        );
        emit TransferedToken(pool, poolTokens[1], msg.sender, secondTokenBalance);
    }

    function changeFeeRecipient(address newRecipient) external onlyOwner {
        address previousFeeReciepient = _feeRecipient;
        _feeRecipient = newRecipient;
        emit ChangedFeeRecipient(previousFeeReciepient, newRecipient);
    }

    function skim(address token, address recipient) external onlyOwner {
        require(!_pools.contains(token), "can't skim LBP token");
        uint256 balance = IERC20(token).balanceOf(address(this));
        TransferHelper.safeTransfer(token, recipient, balance);
        emit Skimmed(token, recipient, balance);
    }
}

// File: @uniswap/lib/contracts/libraries/TransferHelper.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.6.0;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/utils/structs/EnumerableSet.sol



// SPDX-License-Identifier: MIT

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.
 */
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;

        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;

        assembly {
            result := store
        }

        return result;
    }
}

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



// SPDX-License-Identifier: MIT

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;
    }
}