// File: contracts/peripheral/UniswapMigrator.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;
import { IERC20 } from "@openzeppelin/contracts-0.8/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts-0.8/token/ERC20/utils/SafeERC20.sol";

import { IBalancerVault, IPriceOracle, IWeightedPoolFactory } from "../interfaces/balancer/IBalancerCore.sol";
import { IBalancerPool, IAsset, IRateProvider } from "../interfaces/balancer/IBalancerCore.sol";
import { ILiquidityGaugeFactory } from "../_mocks/balancer/MockLiquidityGaugeFactory.sol";
import { IRewardPool } from "../_mocks/balancer/MockRewardPool.sol";
import { IUniswapV2Pair } from "../_mocks/uniswap/MockUniswapV2Pair.sol";
import { IUniswapV2Router02 } from "../_mocks/uniswap/MockUniswapV2Router02.sol";

/**
 * @title   UniswapMigrator
 * @notice  Migrates liquidity positions from Sushiswap or Uniswap v2
 * @dev     Given a "fromLPToken", it removes the liquidity from Sushiswap/Uniswap,
 *          then it creates or join to a balancer pool, adds liquidity to the pool.
 *          Finally if the pool already existed it stakes the liquidity in an aura reward pool.
 */
contract UniswapMigrator {
    using SafeERC20 for IERC20;
    /// @dev Balancer weighted pool factory
    IWeightedPoolFactory public immutable bWeightedPoolFactory;
    /// @dev Balancer vault
    IBalancerVault public immutable bVault;
    /// @dev Balancer liquidity gauge factory
    ILiquidityGaugeFactory public immutable bGaugeFactory;
    /// @dev Uniswap router
    IUniswapV2Router02 public immutable uniswapRouter;
    /// @dev Sushiswap router
    IUniswapV2Router02 public immutable sushiswapRouter;

    address private immutable poolOwner;

    uint256 private constant WEIGHT_50 = 500000000000000000; // 50%
    uint256 private constant GAUGE_WEIGHT_CAP = 20000000000000000; // 2%

    enum LpSource {
        UNISWAP,
        SUSHISWAP
    }
    struct JoinPoolRequest {
        LpSource source;
        address fromLpToken;
        uint256 liquidity;
        IERC20[] tokens;
        uint256[] amountsMin;
        uint256 deadline;
        address pool;
        address rewardPool;
        uint256 amountMinOut;
    }

    struct CreatePoolRequest {
        string name;
        string symbol;
        LpSource source;
        address fromLpToken;
        uint256 liquidity;
        IERC20[] tokens;
        IRateProvider[] rateProviders;
        uint256[] amountsMin;
        uint256 deadline;
        uint256 swapFeePercentage;
    }

    /**
     * @param _bWeightedPoolFactory The pool factory address
     * @param _bVault The balancer vault address
     * @param _bGaugeFactory The balancer liquidity gauge factory address
     * @param _uniswapRouter The uniswap router address
     * @param _sushiwapRouter The sushiswap router address
     * @param _poolOwner The onwer address of created poools.
     */
    constructor(
        address _bWeightedPoolFactory,
        address _bVault,
        address _bGaugeFactory,
        address _uniswapRouter,
        address _sushiwapRouter,
        address _poolOwner
    ) {
        bWeightedPoolFactory = IWeightedPoolFactory(_bWeightedPoolFactory);
        bVault = IBalancerVault(_bVault);
        bGaugeFactory = ILiquidityGaugeFactory(_bGaugeFactory);
        uniswapRouter = IUniswapV2Router02(_uniswapRouter);
        sushiswapRouter = IUniswapV2Router02(_sushiwapRouter);
        poolOwner = _poolOwner;
    }

    /// @dev Event emmited when a new balancer pool is created.
    event PoolCreated(address indexed pool, address gauge);

    /**
     * @dev Migrates a liquidity position, deploys a new `WeightedPool` and adds liquidity to the pool.
     *      The created pool has a weight of 50/50.
     *
     * @param request.name The name of the new pool
     * @param request.symbol The symbol of the new pool
     * @param request.fromLpToken The lp Token address
     * @param request.liquidity The amount of liquidity to remove (lpToken amount)
     * @param request.tokens The underlying tokens, tokens have to be sorted as expected by balancer vault.
     * @param request.rateProviders The underlying tokens rate providers
     * @param request.amountsMin The minimum amount of tokens that must be received.
     * @param request.deadline Unix timestamp after which the transaction will revert.
     * @param request.swapFeePercentage The swap fee percentage
     */
    function migrateUniswapV2AndCreatePool(CreatePoolRequest memory request)
        public
        returns (address pool, address gauge)
    {
        require(request.tokens.length == 2 && request.amountsMin.length == 2, "only token pairs");

        // 1. Remove liquidity
        (address token0, uint256 amount0, , uint256 amount1) = _removeLiquidityUniswapV2(
            request.source,
            request.fromLpToken,
            request.liquidity,
            request.tokens,
            request.amountsMin,
            request.deadline
        );

        uint256[] memory maxAmountsIn = new uint256[](2);

        // sort from uniswap order to balancer order
        (maxAmountsIn[0], maxAmountsIn[1]) = address(request.tokens[0]) == token0
            ? (amount0, amount1)
            : (amount1, amount0);

        // 2. Create balancer pool
        pool = _createBalancerPool(
            request.name,
            request.symbol,
            request.tokens,
            request.rateProviders,
            request.swapFeePercentage
        );

        // 3. Deposit to balancer pool
        _addLiquidityBalancer(pool, request.tokens, maxAmountsIn, msg.sender, 0);

        gauge = bGaugeFactory.create(pool, GAUGE_WEIGHT_CAP);

        emit PoolCreated(pool, gauge);
    }

    /**
     * @dev Migrates a liquidity position, adds liquidity to the pool, and stake the BPT
     *
     * @param request.fromLpToken The lp Token address
     * @param request.liquidity The amount of liquidity to remove (lpToken amount)
     * @param request.tokens The underlying tokens, tokens have to be sorted as expected by balancer vault.
     * @param request.amountsMin The minimum amount of tokens that must be received from uniswap.
     * @param request.deadline Unix timestamp after which the transaction will revert.
     * @param request.pool The pool address to add liquidity
     * @param request.rewardPool The aura reward pool address
     * @param request.amountMinOut The min amount of liquidity added to the balancer pool.
     */
    function migrateUniswapV2AndJoinPool(JoinPoolRequest memory request) public {
        require(request.tokens.length == 2 && request.amountsMin.length == 2, "only token pairs");
        // 1. Remove liquidity
        (address token0, uint256 amount0, , uint256 amount1) = _removeLiquidityUniswapV2(
            request.source,
            request.fromLpToken,
            request.liquidity,
            request.tokens,
            request.amountsMin,
            request.deadline
        );

        // sort amounts for balancer pool
        uint256[] memory maxAmountsIn = new uint256[](2);
        (maxAmountsIn[0], maxAmountsIn[1]) = address(request.tokens[0]) == token0
            ? (amount0, amount1)
            : (amount1, amount0);

        // 2. Deposit to balancer pool
        _addLiquidityBalancer(request.pool, request.tokens, maxAmountsIn, address(this), request.amountMinOut);

        uint256 minted = IERC20(request.pool).balanceOf(address(this));
        require(minted > 0 && request.amountMinOut > 0, "!mint");

        // 3. Deposit to reward pool
        if (request.rewardPool != address(0)) {
            IERC20(request.pool).safeIncreaseAllowance(request.rewardPool, minted);
            IRewardPool(request.rewardPool).deposit(minted, msg.sender);
        } else {
            IERC20(request.pool).safeTransfer(msg.sender, minted);
        }
    }

    function _removeLiquidityUniswapV2(
        LpSource source,
        address fromLpToken,
        uint256 liquidity,
        IERC20[] memory tokens,
        uint256[] memory amountsMin,
        uint256 deadline
    )
        internal
        returns (
            address token0,
            uint256 amount0,
            address token1,
            uint256 amount1
        )
    {
        token0 = IUniswapV2Pair(fromLpToken).token0();
        token1 = IUniswapV2Pair(fromLpToken).token1();

        // Sort tokens and amounts for Uniswap router
        (uint256 amount0Min, uint256 amount1Min) = address(tokens[0]) == token0
            ? (amountsMin[0], amountsMin[1])
            : (amountsMin[1], amountsMin[0]);

        // Sender needs to approve uniswapRouter at least for liquidity,
        IUniswapV2Router02 router = source == LpSource.UNISWAP ? uniswapRouter : sushiswapRouter;

        require(IUniswapV2Pair(fromLpToken).transferFrom(msg.sender, address(this), liquidity), "!liquidity");
        require(IUniswapV2Pair(fromLpToken).approve(address(router), liquidity), "!approval");

        // routers reverts if min amounts are not met, no need to check the output.
        (amount0, amount1) = router.removeLiquidity(
            token0,
            token1,
            liquidity,
            amount0Min,
            amount1Min,
            address(this),
            deadline
        );
    }

    /**
     * Creates a balancer pool, it could be either a Stable Pool  or a Weighted Pool
     *
     * @param name The name of the new pool
     * @param symbol The symbol of the new pool
     * @param tokens The underlying tokens of the balancer pool, have to be sorted as expected by balancer vault.
     * @param rateProviders The underlying tokens rate providers
     * @param swapFeePercentage The swap fee percentage
     */
    function _createBalancerPool(
        string memory name,
        string memory symbol,
        IERC20[] memory tokens,
        IRateProvider[] memory rateProviders,
        uint256 swapFeePercentage
    ) internal returns (address pool) {
        uint256[] memory normalizedWeights = new uint256[](2);
        normalizedWeights[0] = WEIGHT_50;
        normalizedWeights[1] = WEIGHT_50;
        pool = bWeightedPoolFactory.create(
            name,
            symbol,
            tokens,
            normalizedWeights,
            rateProviders,
            swapFeePercentage,
            poolOwner
        );
    }

    function _addLiquidityBalancer(
        address pool,
        IERC20[] memory tokens,
        uint256[] memory maxAmountsIn,
        address recipient,
        uint256 amountMinOut
    ) internal {
        // add liquidity to balancer pool
        bytes32 poolId = IBalancerPool(pool).getPoolId();
        IAsset[] memory assets = new IAsset[](2);
        assets[0] = IAsset(address(tokens[0]));
        assets[1] = IAsset(address(tokens[1]));

        tokens[0].safeIncreaseAllowance(address(bVault), maxAmountsIn[0]);
        tokens[1].safeIncreaseAllowance(address(bVault), maxAmountsIn[1]);

        bytes memory userData;
        if (IBalancerPool(pool).totalSupply() == 0) {
            // Initialise pool
            userData = abi.encode(IBalancerVault.JoinKind.INIT, maxAmountsIn);
        } else {
            userData = abi.encode(IBalancerVault.JoinKind.EXACT_TOKENS_IN_FOR_BPT_OUT, maxAmountsIn, amountMinOut);
        }

        bVault.joinPool(
            poolId,
            address(this), //sender
            recipient, // recipient
            IBalancerVault.JoinPoolRequest(
                assets,
                maxAmountsIn,
                userData,
                false // Don't use internal balances
            )
        );
    }
}

// File: @openzeppelin/contracts-0.8/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

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-0.8/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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));
        }
    }

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

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

// File: contracts/interfaces/balancer/IBalancerCore.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

import { IERC20 } from "@openzeppelin/contracts-0.8/token/ERC20/IERC20.sol";

interface IPriceOracle {
    struct OracleAverageQuery {
        Variable variable;
        uint256 secs;
        uint256 ago;
    }
    enum Variable {
        PAIR_PRICE,
        BPT_PRICE,
        INVARIANT
    }

    function getTimeWeightedAverage(OracleAverageQuery[] memory queries)
        external
        view
        returns (uint256[] memory results);
}

interface IBalancerVault {
    enum PoolSpecialization {
        GENERAL,
        MINIMAL_SWAP_INFO,
        TWO_TOKEN
    }
    enum JoinKind {
        INIT,
        EXACT_TOKENS_IN_FOR_BPT_OUT,
        TOKEN_IN_FOR_EXACT_BPT_OUT,
        ALL_TOKENS_IN_FOR_EXACT_BPT_OUT
    }

    enum SwapKind {
        GIVEN_IN,
        GIVEN_OUT
    }

    struct SingleSwap {
        bytes32 poolId;
        SwapKind kind;
        IAsset assetIn;
        IAsset assetOut;
        uint256 amount;
        bytes userData;
    }

    struct FundManagement {
        address sender;
        bool fromInternalBalance;
        address payable recipient;
        bool toInternalBalance;
    }

    struct JoinPoolRequest {
        IAsset[] assets;
        uint256[] maxAmountsIn;
        bytes userData;
        bool fromInternalBalance;
    }

    function getPool(bytes32 poolId) external view returns (address, PoolSpecialization);

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

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

    function swap(
        SingleSwap memory singleSwap,
        FundManagement memory funds,
        uint256 limit,
        uint256 deadline
    ) external returns (uint256 amountCalculated);

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

    function getInternalBalance(address user, address[] memory tokens) external view returns (uint256[] memory);

    struct ExitPoolRequest {
        IAsset[] assets;
        uint256[] minAmountsOut;
        bytes userData;
        bool toInternalBalance;
    }
    enum ExitKind {
        EXACT_BPT_IN_FOR_ONE_TOKEN_OUT,
        EXACT_BPT_IN_FOR_TOKENS_OUT,
        BPT_IN_FOR_EXACT_TOKENS_OUT,
        MANAGEMENT_FEE_TOKENS_OUT // for ManagedPool
    }
}

interface IAsset {
    // solhint-disable-previous-line no-empty-blocks
}

interface IBalancerPool {
    function getPoolId() external view returns (bytes32);

    function getNormalizedWeights() external view returns (uint256[] memory);

    function getSwapEnabled() external view returns (bool);

    function getOwner() external view returns (address);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);
}

interface ILBPFactory {
    function create(
        string memory name,
        string memory symbol,
        IERC20[] memory tokens,
        uint256[] memory weights,
        uint256 swapFeePercentage,
        address owner,
        bool swapEnabledOnStart
    ) external returns (address);
}

interface ILBP {
    function setSwapEnabled(bool swapEnabled) external;

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

    function getGradualWeightUpdateParams()
        external
        view
        returns (
            uint256 startTime,
            uint256 endTime,
            uint256[] memory endWeights
        );
}

interface IStablePoolFactory {
    function create(
        string memory name,
        string memory symbol,
        IERC20[] memory tokens,
        uint256 amplificationParameter,
        uint256 swapFeePercentage,
        address owner
    ) external returns (address);
}

interface IWeightedPool2TokensFactory {
    function create(
        string memory name,
        string memory symbol,
        IERC20[] memory tokens,
        uint256[] memory weights,
        uint256 swapFeePercentage,
        bool oracleEnabled,
        address owner
    ) external returns (address);
}

interface IRateProvider {
    function getRate() external view returns (uint256);
}

interface IWeightedPoolFactory {
    /**
     * @dev Deploys a new `WeightedPool`.
     */
    function create(
        string memory name,
        string memory symbol,
        IERC20[] memory tokens,
        uint256[] memory normalizedWeights,
        IRateProvider[] memory rateProviders,
        uint256 swapFeePercentage,
        address owner
    ) external returns (address);
}

// File: contracts/_mocks/balancer/MockLiquidityGaugeFactory.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

interface ILiquidityGaugeFactory {
    function create(address pool, uint256 relativeWeightCap) external returns (address);
}

// File: contracts/_mocks/balancer/MockRewardPool.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

interface IRewardPool {
    function deposit(uint256 assets, address receiver) external returns (uint256 shares);
}

// File: contracts/_mocks/uniswap/MockUniswapV2Pair.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

interface IUniswapV2Pair {
    function approve(address spender, uint256 value) external returns (bool);

    function balanceOf(address owner) external view returns (uint256);

    function totalSupply() external view returns (uint256);

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 _reserve0,
            uint112 _reserve1,
            uint32 _blockTimestampLast
        );
}

// File: contracts/_mocks/uniswap/MockUniswapV2Router02.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts);
}

// File: @openzeppelin/contracts-0.8/utils/Address.sol



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

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    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.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

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

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

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

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

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

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

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

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

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

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

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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}