// SPDX-License-Identifier: MIT

pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

// File: @sushiswap/core/contracts/uniswapv2/libraries/SafeMath.sol


// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMathUniswap {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
}

// File: @sushiswap/core/contracts/uniswapv2/libraries/TransferHelper.sol



// 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, uint 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: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint 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: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint 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: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}

// File: @sushiswap/core/contracts/uniswapv2/interfaces/IERC20.sol


interface IERC20Uniswap {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

// File: contracts/interfaces/IMintable.sol



interface IMintable {
    function mint(address to, uint256 amount) external;
}

// File: contracts/libraries/EIP712.sol



library EIP712 {
    function recover(
        // solhint-disable-next-line var-name-mixedcase
        bytes32 DOMAIN_SEPARATOR,
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, hash));
        return ecrecover(digest, v, r, s);
    }
}

// File: contracts/libraries/Bytes32Pagination.sol



library Bytes32Pagination {
    function paginate(
        bytes32[] memory hashes,
        uint256 page,
        uint256 limit
    ) internal pure returns (bytes32[] memory result) {
        result = new bytes32[](limit);
        for (uint256 i = 0; i < limit; i++) {
            if (page * limit + i >= hashes.length) {
                result[i] = bytes32(0);
            } else {
                result[i] = hashes[page * limit + i];
            }
        }
    }
}

// File: contracts/mixins/Ownable.sol

// solhint-disable-next-line max-line-length
// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol


abstract contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    modifier onlyOwner {
        require(_owner == msg.sender, "msg-sender-not-owner");
        _;
    }

    function _initialize(address owner) internal {
        _owner = owner;
    }

    function owner() public view returns (address) {
        return _owner;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "invalid-address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
}

// File: @sushiswap/core/contracts/uniswapv2/interfaces/IUniswapV2Pair.sol


interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint 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 (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    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 (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

// File: @sushiswap/core/contracts/uniswapv2/libraries/UniswapV2Library.sol




library UniswapV2Library {
    using SafeMathUniswap for uint;

    // returns sorted token addresses, used to handle return values from pairs sorted in this order
    function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
        require(tokenA != tokenB, 'UniswapV2Library: IDENTICAL_ADDRESSES');
        (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'UniswapV2Library: ZERO_ADDRESS');
    }

    // calculates the CREATE2 address for a pair without making any external calls
    function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(uint(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                hex'e18a34eb0e04b04f7a0ac29a6e80748dca96319b42c54d679cb821dca90c6303' // init code hash
            ))));
    }

    // fetches and sorts the reserves for a pair
    function getReserves(address factory, address tokenA, address tokenB) internal view returns (uint reserveA, uint reserveB) {
        (address token0,) = sortTokens(tokenA, tokenB);
        (uint reserve0, uint reserve1,) = IUniswapV2Pair(pairFor(factory, tokenA, tokenB)).getReserves();
        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
    }

    // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
    function quote(uint amountA, uint reserveA, uint reserveB) internal pure returns (uint amountB) {
        require(amountA > 0, 'UniswapV2Library: INSUFFICIENT_AMOUNT');
        require(reserveA > 0 && reserveB > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        amountB = amountA.mul(reserveB) / reserveA;
    }

    // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {
        require(amountIn > 0, 'UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        uint amountInWithFee = amountIn.mul(997);
        uint numerator = amountInWithFee.mul(reserveOut);
        uint denominator = reserveIn.mul(1000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }

    // given an output amount of an asset and pair reserves, returns a required input amount of the other asset
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) internal pure returns (uint amountIn) {
        require(amountOut > 0, 'UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        uint numerator = reserveIn.mul(amountOut).mul(1000);
        uint denominator = reserveOut.sub(amountOut).mul(997);
        amountIn = (numerator / denominator).add(1);
    }

    // performs chained getAmountOut calculations on any number of pairs
    function getAmountsOut(address factory, uint amountIn, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[0] = amountIn;
        for (uint i; i < path.length - 1; i++) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i], path[i + 1]);
            amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);
        }
    }

    // performs chained getAmountIn calculations on any number of pairs
    function getAmountsIn(address factory, uint amountOut, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint i = path.length - 1; i > 0; i--) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i - 1], path[i]);
            amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
        }
    }
}

// File: @sushiswap/core/contracts/uniswapv2/interfaces/IUniswapV2Router01.sol


interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// File: @sushiswap/core/contracts/uniswapv2/interfaces/IUniswapV2Router02.sol



interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// File: @sushiswap/core/contracts/uniswapv2/interfaces/IUniswapV2Factory.sol


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 migrator() 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;
    function setMigrator(address) external;
}

// File: @sushiswap/core/contracts/uniswapv2/interfaces/IWETH.sol


interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// File: contracts/libraries/Orders.sol



library Orders {
    // keccak256("Order(address maker,address fromToken,address toToken,uint256 amountIn,uint256 amountOutMin,address recipient,uint256 deadline)")
    bytes32 public constant ORDER_TYPEHASH = 0x7c228c78bd055996a44b5046fb56fa7c28c66bce92d9dc584f742b2cd76a140f;

    struct Order {
        address maker;
        address fromToken;
        address toToken;
        uint256 amountIn;
        uint256 amountOutMin;
        address recipient;
        uint256 deadline;
        uint8 v;
        bytes32 r;
        bytes32 s;
    }

    function hash(Order memory order) internal pure returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    ORDER_TYPEHASH,
                    order.maker,
                    order.fromToken,
                    order.toToken,
                    order.amountIn,
                    order.amountOutMin,
                    order.recipient,
                    order.deadline
                )
            );
    }
}

// File: contracts/interfaces/ISettlement.sol




interface ISettlement {
    event OrderFilled(bytes32 indexed hash, uint256 amountIn, uint256 amountOut);
    event OrderCanceled(bytes32 indexed hash);
    event FeeTransferred(bytes32 indexed hash, address indexed recipient, uint256 amount);
    event FeeSplitTransferred(bytes32 indexed hash, address indexed recipient, uint256 amount);

    struct FillOrderArgs {
        Orders.Order order;
        uint256 amountToFillIn;
        address[] path;
    }

    function fillOrder(FillOrderArgs calldata args) external returns (uint256 amountOut);

    function fillOrders(FillOrderArgs[] calldata args) external returns (uint256[] memory amountsOut);

    function cancelOrder(Orders.Order calldata order) external;
}

// File: contracts/UniswapV2Router02Settlement.sol











abstract contract UniswapV2Router02Settlement is ISettlement {
    using SafeMathUniswap for uint256;

    address public factory;
    // solhint-disable-next-line var-name-mixedcase
    address public WETH;

    modifier ensure(uint256 deadline) {
        require(deadline >= block.timestamp, "EXPIRED");
        _;
    }

    // solhint-disable-next-line var-name-mixedcase
    function _initialize(address _factory, address _WETH) internal {
        factory = _factory;
        WETH = _WETH;
    }

    function fillOrder(FillOrderArgs memory args)
        public
        virtual
        override
        returns (uint256 amountOut);

    function fillOrders(FillOrderArgs[] memory args)
        public
        virtual
        override
        returns (uint256[] memory amountsOut);

    receive() external payable {
        assert(msg.sender == WETH);
        // only accept ETH via fallback from the WETH contract
    }

    // **** ADD LIQUIDITY ****
    function _addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin
    ) internal returns (uint256 amountA, uint256 amountB) {
        // create the pair if it doesn't exist yet
        if (IUniswapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) {
            IUniswapV2Factory(factory).createPair(tokenA, tokenB);
        }
        (uint256 reserveA, uint256 reserveB) = UniswapV2Library.getReserves(
            factory,
            tokenA,
            tokenB
        );
        if (reserveA == 0 && reserveB == 0) {
            (amountA, amountB) = (amountADesired, amountBDesired);
        } else {
            uint256 amountBOptimal = UniswapV2Library.quote(amountADesired, reserveA, reserveB);
            if (amountBOptimal <= amountBDesired) {
                require(amountBOptimal >= amountBMin, "INSUFFICIENT_B_AMOUNT");
                (amountA, amountB) = (amountADesired, amountBOptimal);
            } else {
                uint256 amountAOptimal = UniswapV2Library.quote(amountBDesired, reserveB, reserveA);
                assert(amountAOptimal <= amountADesired);
                require(amountAOptimal >= amountAMin, "INSUFFICIENT_A_AMOUNT");
                (amountA, amountB) = (amountAOptimal, amountBDesired);
            }
        }
    }

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    )
        external
        ensure(deadline)
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        )
    {
        fillOrders(args);
        (amountA, amountB) = _addLiquidity(
            tokenA,
            tokenB,
            amountADesired,
            amountBDesired,
            amountAMin,
            amountBMin
        );
        address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
        TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA);
        TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB);
        liquidity = IUniswapV2Pair(pair).mint(to);
    }

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    )
        external
        payable
        ensure(deadline)
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        )
    {
        fillOrders(args);
        (amountToken, amountETH) = _addLiquidity(
            token,
            WETH,
            amountTokenDesired,
            msg.value,
            amountTokenMin,
            amountETHMin
        );
        address pair = UniswapV2Library.pairFor(factory, token, WETH);
        TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);
        IWETH(WETH).deposit{value: amountETH}();
        assert(IWETH(WETH).transfer(pair, amountETH));
        liquidity = IUniswapV2Pair(pair).mint(to);
        // refund dust eth, if any
        if (msg.value > amountETH)
            TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH);
    }

    // **** REMOVE LIQUIDITY ****
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) public ensure(deadline) returns (uint256 amountA, uint256 amountB) {
        fillOrders(args);
        address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
        IUniswapV2Pair(pair).transferFrom(msg.sender, pair, liquidity);
        // send liquidity to pair
        (uint256 amount0, uint256 amount1) = IUniswapV2Pair(pair).burn(to);
        (address token0, ) = UniswapV2Library.sortTokens(tokenA, tokenB);
        (amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);
        require(amountA >= amountAMin, "INSUFFICIENT_A_AMOUNT");
        require(amountB >= amountBMin, "INSUFFICIENT_B_AMOUNT");
    }

    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) public ensure(deadline) returns (uint256 amountToken, uint256 amountETH) {
        (amountToken, amountETH) = removeLiquidity(
            token,
            WETH,
            liquidity,
            amountTokenMin,
            amountETHMin,
            address(this),
            deadline,
            args
        );
        TransferHelper.safeTransfer(token, to, amountToken);
        IWETH(WETH).withdraw(amountETH);
        TransferHelper.safeTransferETH(to, 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,
        FillOrderArgs[] memory args
    ) external returns (uint256 amountA, uint256 amountB) {
        revert("Unimplemented");
    }

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s,
        FillOrderArgs[] memory args
    ) external returns (uint256 amountToken, uint256 amountETH) {
        revert("Unimplemented");
    }

    // **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens) ****
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) public ensure(deadline) returns (uint256 amountETH) {
        (, amountETH) = removeLiquidity(
            token,
            WETH,
            liquidity,
            amountTokenMin,
            amountETHMin,
            address(this),
            deadline,
            args
        );
        TransferHelper.safeTransfer(token, to, IERC20Uniswap(token).balanceOf(address(this)));
        IWETH(WETH).withdraw(amountETH);
        TransferHelper.safeTransferETH(to, amountETH);
    }

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s,
        FillOrderArgs[] memory args
    ) external returns (uint256 amountETH) {
        address pair = UniswapV2Library.pairFor(factory, token, WETH);
        uint256 value = approveMax ? uint256(-1) : liquidity;
        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        amountETH = removeLiquidityETHSupportingFeeOnTransferTokens(
            token,
            liquidity,
            amountTokenMin,
            amountETHMin,
            to,
            deadline,
            args
        );
    }

    // **** SWAP ****
    // requires the initial amount to have already been sent to the first pair
    function _swap(
        uint256[] memory amounts,
        address[] memory path,
        address _to
    ) internal {
        for (uint256 i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0, ) = UniswapV2Library.sortTokens(input, output);
            uint256 amountOut = amounts[i + 1];
            (uint256 amount0Out, uint256 amount1Out) = input == token0
                ? (uint256(0), amountOut)
                : (amountOut, uint256(0));
            address to = i < path.length - 2
                ? UniswapV2Library.pairFor(factory, output, path[i + 2])
                : _to;
            IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output)).swap(
                amount0Out,
                amount1Out,
                to,
                new bytes(0)
            );
        }
    }

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external ensure(deadline) returns (uint256[] memory amounts) {
        fillOrders(args);
        amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
        require(amounts[amounts.length - 1] >= amountOutMin, "INSUFFICIENT_OUTPUT_AMOUNT");
        TransferHelper.safeTransferFrom(
            path[0],
            msg.sender,
            UniswapV2Library.pairFor(factory, path[0], path[1]),
            amounts[0]
        );
        _swap(amounts, path, to);
    }

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external ensure(deadline) returns (uint256[] memory amounts) {
        fillOrders(args);
        amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
        require(amounts[0] <= amountInMax, "EXCESSIVE_INPUT_AMOUNT");
        TransferHelper.safeTransferFrom(
            path[0],
            msg.sender,
            UniswapV2Library.pairFor(factory, path[0], path[1]),
            amounts[0]
        );
        _swap(amounts, path, to);
    }

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external payable ensure(deadline) returns (uint256[] memory amounts) {
        fillOrders(args);
        require(path[0] == WETH, "INVALID_PATH");
        amounts = UniswapV2Library.getAmountsOut(factory, msg.value, path);
        require(amounts[amounts.length - 1] >= amountOutMin, "INSUFFICIENT_OUTPUT_AMOUNT");
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(
            IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0])
        );
        _swap(amounts, path, to);
    }

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external ensure(deadline) returns (uint256[] memory amounts) {
        fillOrders(args);
        require(path[path.length - 1] == WETH, "INVALID_PATH");
        amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
        require(amounts[0] <= amountInMax, "EXCESSIVE_INPUT_AMOUNT");
        TransferHelper.safeTransferFrom(
            path[0],
            msg.sender,
            UniswapV2Library.pairFor(factory, path[0], path[1]),
            amounts[0]
        );
        _swap(amounts, path, address(this));
        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
    }

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external ensure(deadline) returns (uint256[] memory amounts) {
        fillOrders(args);
        require(path[path.length - 1] == WETH, "INVALID_PATH");
        amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
        require(amounts[amounts.length - 1] >= amountOutMin, "INSUFFICIENT_OUTPUT_AMOUNT");
        TransferHelper.safeTransferFrom(
            path[0],
            msg.sender,
            UniswapV2Library.pairFor(factory, path[0], path[1]),
            amounts[0]
        );
        _swap(amounts, path, address(this));
        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
    }

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external payable ensure(deadline) returns (uint256[] memory amounts) {
        fillOrders(args);
        require(path[0] == WETH, "INVALID_PATH");
        amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
        require(amounts[0] <= msg.value, "EXCESSIVE_INPUT_AMOUNT");
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(
            IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0])
        );
        _swap(amounts, path, to);
        // refund dust eth, if any
        if (msg.value > amounts[0])
            TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);
    }

    // **** SWAP (supporting fee-on-transfer tokens) ****
    // requires the initial amount to have already been sent to the first pair
    function _swapSupportingFeeOnTransferTokens(address[] memory path, address _to) internal {
        for (uint256 i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0, ) = UniswapV2Library.sortTokens(input, output);
            IUniswapV2Pair pair = IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output));
            uint256 amountInput;
            uint256 amountOutput;
            {
                // scope to avoid stack too deep errors
                (uint256 reserve0, uint256 reserve1, ) = pair.getReserves();
                (uint256 reserveInput, uint256 reserveOutput) = input == token0
                    ? (reserve0, reserve1)
                    : (reserve1, reserve0);
                amountInput = IERC20Uniswap(input).balanceOf(address(pair)).sub(reserveInput);
                amountOutput = UniswapV2Library.getAmountOut(
                    amountInput,
                    reserveInput,
                    reserveOutput
                );
            }
            (uint256 amount0Out, uint256 amount1Out) = input == token0
                ? (uint256(0), amountOutput)
                : (amountOutput, uint256(0));
            address to = i < path.length - 2
                ? UniswapV2Library.pairFor(factory, output, path[i + 2])
                : _to;
            pair.swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external ensure(deadline) {
        fillOrders(args);
        TransferHelper.safeTransferFrom(
            path[0],
            msg.sender,
            UniswapV2Library.pairFor(factory, path[0], path[1]),
            amountIn
        );
        uint256 balanceBefore = IERC20Uniswap(path[path.length - 1]).balanceOf(to);
        _swapSupportingFeeOnTransferTokens(path, to);
        require(
            IERC20Uniswap(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
            "INSUFFICIENT_OUTPUT_AMOUNT"
        );
    }

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external payable ensure(deadline) {
        fillOrders(args);
        require(path[0] == WETH, "INVALID_PATH");
        uint256 amountIn = msg.value;
        IWETH(WETH).deposit{value: amountIn}();
        assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn));
        uint256 balanceBefore = IERC20Uniswap(path[path.length - 1]).balanceOf(to);
        _swapSupportingFeeOnTransferTokens(path, to);
        require(
            IERC20Uniswap(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
            "INSUFFICIENT_OUTPUT_AMOUNT"
        );
    }

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        FillOrderArgs[] memory args
    ) external ensure(deadline) {
        fillOrders(args);
        require(path[path.length - 1] == WETH, "INVALID_PATH");
        TransferHelper.safeTransferFrom(
            path[0],
            msg.sender,
            UniswapV2Library.pairFor(factory, path[0], path[1]),
            amountIn
        );
        _swapSupportingFeeOnTransferTokens(path, address(this));
        uint256 amountOut = IERC20Uniswap(WETH).balanceOf(address(this));
        require(amountOut >= amountOutMin, "INSUFFICIENT_OUTPUT_AMOUNT");
        IWETH(WETH).withdraw(amountOut);
        TransferHelper.safeTransferETH(to, amountOut);
    }

    // **** LIBRARY FUNCTIONS ****
    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) public pure returns (uint256 amountB) {
        return UniswapV2Library.quote(amountA, reserveA, reserveB);
    }

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) public pure returns (uint256 amountOut) {
        return UniswapV2Library.getAmountOut(amountIn, reserveIn, reserveOut);
    }

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) public pure returns (uint256 amountIn) {
        return UniswapV2Library.getAmountIn(amountOut, reserveIn, reserveOut);
    }

    function getAmountsOut(uint256 amountIn, address[] memory path)
        public
        view
        returns (uint256[] memory amounts)
    {
        return UniswapV2Library.getAmountsOut(factory, amountIn, path);
    }

    function getAmountsIn(uint256 amountOut, address[] memory path)
        public
        view
        returns (uint256[] memory amounts)
    {
        return UniswapV2Library.getAmountsIn(factory, amountOut, path);
    }
}

// File: contracts/Settlement.sol











contract Settlement is Ownable, UniswapV2Router02Settlement {
    using SafeMathUniswap for uint256;
    using Orders for Orders.Order;
    using Bytes32Pagination for bytes32[];

    // Maximum fee= 1%
    uint256 public constant MAX_FEE_NUMERATOR = 100;
    // Maximum fee split = 50%
    uint256 public constant MAX_FEE_SPLIT_NUMERATOR = 5000;
    // solhint-disable-next-line var-name-mixedcase
    bytes32 public DOMAIN_SEPARATOR;

    bool private _initialized;
    // Array of hashes of all canceled orders
    bytes32[] internal _allCanceledHashes;
    // Address of order maker => canceled hashes (orders)
    mapping(address => bytes32[]) internal _canceledHashesOfMaker;
    // Address of fromToken => canceled hashes (orders)
    mapping(address => bytes32[]) internal _canceledHashesOfFromToken;
    // Address of toToken => canceled hashes (orders)
    mapping(address => bytes32[]) internal _canceledHashesOfToToken;
    // Hash of an order => if canceled
    mapping(bytes32 => bool) public canceledOfHash;
    // Hash of an order => filledAmountIn
    mapping(bytes32 => uint256) public filledAmountInOfHash;

    // Address of the Sushi token
    address public sushi;

    // This address receives (feeSplitNumerator / 10000) of fee for every order filling
    address public feeSplitRecipient;

    // Used to calculate the total fee of an order
    // Denominator is 10000
    uint256 public feeNumerator;

    // Used to calculate how big the share going to the relayer is
    // Out of fee, denominator is 10000
    uint256 public feeSplitNumerator;

    function initialize(
        uint256 orderBookChainId,
        address orderBookAddress,
        address owner,
        address _factory,
        address _weth,
        address _sushi,
        address _feeSplitRecipient,
        uint256 _feeNumerator,
        uint256 _feeSplitNumerator
    ) public {
        require(!_initialized, "already-initialized");

        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256("OrderBook"),
                keccak256("1"),
                orderBookChainId,
                orderBookAddress
            )
        );

        Ownable._initialize(owner);
        UniswapV2Router02Settlement._initialize(_factory, _weth);

        sushi = _sushi;
        feeSplitRecipient = _feeSplitRecipient;
        feeNumerator = _feeNumerator;
        feeSplitNumerator = _feeSplitNumerator;

        _initialized = true;
    }

    // Updates the fee amount
    function updateFee(uint256 _feeNumerator) public onlyOwner {
        require(_feeNumerator < MAX_FEE_NUMERATOR, "fee-too-high");
        feeNumerator = _feeNumerator;
    }

    // Updates the fee's split ratio between the relayer and feeSplitRecipient
    function updateFeeSplit(uint256 _feeSplitNumerator) public onlyOwner {
        require(_feeSplitNumerator < MAX_FEE_SPLIT_NUMERATOR, "fee-split-too-high");
        feeSplitNumerator = _feeSplitNumerator;
    }

    // Returns the number of canceled orders of a maker
    function numberOfCanceledHashesOfMaker(address maker) public view returns (uint256) {
        return _canceledHashesOfMaker[maker].length;
    }

    // Return the number of canceled orders where fromToken is the origin token
    function numberOfCanceledHashesOfFromToken(address fromToken) public view returns (uint256) {
        return _canceledHashesOfFromToken[fromToken].length;
    }

    // Return the number of canceled orders where toToken is the target token
    function numberOfCanceledHashesOfToToken(address toToken) public view returns (uint256) {
        return _canceledHashesOfToToken[toToken].length;
    }

    // Returns the number of canceled orders
    function numberOfAllCanceledHashes() public view returns (uint256) {
        return _allCanceledHashes.length;
    }

    // Returns an array of hashes of canceled orders of a maker
    function canceledHashesOfMaker(
        address maker,
        uint256 page,
        uint256 limit
    ) public view returns (bytes32[] memory) {
        return _canceledHashesOfMaker[maker].paginate(page, limit);
    }

    // Returns an array of hashes of canceled orders where fromToken is the origin token
    function canceledHashesOfFromToken(
        address fromToken,
        uint256 page,
        uint256 limit
    ) public view returns (bytes32[] memory) {
        return _canceledHashesOfFromToken[fromToken].paginate(page, limit);
    }

    // Returns an array of hashes of canceled orders where toToken is the target token
    function canceledHashesOfToToken(
        address toToken,
        uint256 page,
        uint256 limit
    ) public view returns (bytes32[] memory) {
        return _canceledHashesOfToToken[toToken].paginate(page, limit);
    }

    // Return an array of canceled hashes
    function allCanceledHashes(uint256 page, uint256 limit) public view returns (bytes32[] memory) {
        return _allCanceledHashes.paginate(page, limit);
    }

    // Fills an order
    function fillOrder(FillOrderArgs memory args) public override returns (uint256 amountOut) {
        // solhint-disable-next-line avoid-tx-origin
        require(msg.sender == tx.origin, "called-by-contract");
        // voids flashloan attack vectors

        // Check the approved amount from maker
        uint256 allowance = IERC20Uniswap(args.order.fromToken).allowance(args.order.maker, address(this));
        if (allowance < args.amountToFillIn) {
            return 0;
        }
        // Check if the signature is valid
        bytes32 hash = args.order.hash();
        address signer = EIP712.recover(DOMAIN_SEPARATOR, hash, args.order.v, args.order.r, args.order.s);
        if (signer == address(0) || signer != args.order.maker) {
            return 0;
        }
        // Check if the order is valid
        if (!_validateArgs(args)) {
            return 0;
        }
        // Check if the order is canceled / already fully filled
        if (!_validateStatus(args, hash)) {
            return 0;
        }

        // Calculates fee deducted amountIn and amountOutMin
        (uint256 amountIn, uint256 amountOutMin) = (
        args.amountToFillIn,
        args.order.amountOutMin.mul(args.amountToFillIn) / args.order.amountIn
        );
        uint256 _feeNumerator = feeNumerator;
        uint256 fee = amountIn.mul(_feeNumerator) / 10000;
        if (fee > 0) {
            amountIn = amountIn.sub(fee);
            amountOutMin = amountOutMin.sub(amountOutMin.mul(_feeNumerator) / 10000);
        }

        // Requires args.amountToFillIn to have already been approved to this
        amountOut = _swapExactTokensForTokens(
            args.order.maker,
            amountIn,
            amountOutMin,
            args.path,
            args.order.recipient
        );

        if (amountOut > 0) {
            if (fee > 0) {
                _transferFees(args.order.fromToken, args.order.maker, fee, hash);
            }

            // This line is free from reentrancy issues since UniswapV2Pair prevents from them
            filledAmountInOfHash[hash] = filledAmountInOfHash[hash].add(args.amountToFillIn);

            emit OrderFilled(hash, args.amountToFillIn, amountOut);
        }
    }

    // Checks if an order is valid - if it contains all the information required
    function _validateArgs(FillOrderArgs memory args) internal view returns (bool) {
        return
        args.order.maker != address(0) &&
        args.order.fromToken != address(0) &&
        args.order.toToken != address(0) &&
        args.order.fromToken != args.order.toToken &&
        args.order.amountIn != uint256(0) &&
        args.order.amountOutMin != uint256(0) &&
        args.order.recipient != address(0) &&
        args.order.deadline != uint256(0) &&
        args.order.deadline >= block.timestamp &&
        args.amountToFillIn > 0 &&
        args.path.length >= 2 &&
        args.order.fromToken == args.path[0] &&
        args.order.toToken == args.path[args.path.length - 1];
    }

    // Checks if an order is canceled / already fully filled
    function _validateStatus(FillOrderArgs memory args, bytes32 hash) internal view returns (bool) {
        if (canceledOfHash[hash]) {
            return false;
        }
        if (filledAmountInOfHash[hash].add(args.amountToFillIn) > args.order.amountIn) {
            return false;
        }
        return true;
    }

    // Transfers the fees to the feeSplitRecipient and the relayer
    function _transferFees(
        address fromToken,
        address maker,
        uint256 amount,
        bytes32 hash
    ) internal {
        // If fromToken is WETH then path is [fromToken, sushi], otherwise [fromToken, WETH, sushi]
        address _weth = WETH;
        address[] memory path = new address[](fromToken == _weth ? 2 : 3);
        path[path.length - 1] = sushi;
        path[path.length - 2] = _weth;
        if (fromToken != _weth) {
            path[0] = fromToken;
        }
        uint256 amountOfSushi = _swapExactTokensForTokens(maker, amount, 0, path, address(this));
        require(amountOfSushi > 0, "swap-to-sushi-failure");

        uint256 feeSplit = amountOfSushi.mul(feeSplitNumerator) / 10000;
        if (feeSplit > 0) {
            address _recipient = feeSplitRecipient;
            TransferHelper.safeTransfer(sushi, _recipient, feeSplit);
            emit FeeSplitTransferred(hash, _recipient, feeSplit);
        }
        uint256 remainder = amountOfSushi.sub(feeSplit);
        TransferHelper.safeTransfer(sushi, msg.sender, remainder);
        emit FeeTransferred(hash, msg.sender, remainder);
    }

    // Swaps an exact amount of tokens for another token through the path passed as an argument
    // Returns the amount of the final token
    function _swapExactTokensForTokens(
        address from,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] memory path,
        address to
    ) internal returns (uint256 amountOut) {
        uint256[] memory amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
        if (amounts[amounts.length - 1] < amountOutMin) {
            return 0;
        }
        TransferHelper.safeTransferFrom(path[0], from, UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn);
        _swap(amounts, path, to);
        amountOut = amounts[amounts.length - 1];
    }

    // Fills multiple orders passed as an array
    function fillOrders(FillOrderArgs[] memory args) public override returns (uint256[] memory amountsOut) {
        bool filled = false;
        amountsOut = new uint256[](args.length);
        for (uint256 i = 0; i < args.length; i++) {
            // Returns zero of the order wasn't filled
            amountsOut[i] = fillOrder(args[i]);
            if (amountsOut[i] > 0) {
                // At least one order was filled
                filled = true;
            }
        }
        require(filled, "no-order-filled");
    }

    // Cancels an order, has to been called by order maker
    function cancelOrder(Orders.Order memory order) public override {
        require(msg.sender == order.maker, "not-called-by-maker");

        bytes32 hash = order.hash();
        address signer = EIP712.recover(DOMAIN_SEPARATOR, hash, order.v, order.r, order.s);
        require(signer != address(0) && signer == order.maker, "invalid-signature");
        require(!canceledOfHash[hash], "already-canceled");

        _allCanceledHashes.push(hash);
        _canceledHashesOfMaker[order.maker].push(hash);
        _canceledHashesOfFromToken[order.fromToken].push(hash);
        _canceledHashesOfToToken[order.toToken].push(hash);
        canceledOfHash[hash] = true;

        emit OrderCanceled(hash);
    }
}