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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

import "./interfaces/IUniswapV2Pair.sol";
import "./UniswapV2ERC20.sol";
import "./libraries/Math.sol";
import "./libraries/UQ112x112.sol";
import "./interfaces/IUniswapV2Callee.sol";

import {IUniswapV2Factory} from "./factory/interfaces/IUniswapV2Factory.sol";

import {IERC20} from "../shared/interfaces/IERC20.sol";

import {ISwapDiscount} from "./factory/interfaces/ISwapDiscount.sol";
import {IPairWithDiscount} from "./interfaces/IPairWithDiscount.sol";

contract UniswapV2Pair is IUniswapV2Pair, IPairWithDiscount, UniswapV2ERC20 {
    using UQ112x112 for uint224;

    uint256 public constant MINIMUM_LIQUIDITY = 10**3;
    bytes4 private constant SELECTOR = 0xa9059cbb; // bytes4(keccak256(bytes('transfer(address,uint256)')));

    string private tokenSymbol;

    address public immutable factory;
    address public token0;
    address public token1;

    uint112 private reserve0; // uses single storage slot, accessible via getReserves
    uint112 private reserve1; // uses single storage slot, accessible via getReserves
    uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint256 public price0CumulativeLast;
    uint256 public price1CumulativeLast;
    uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint256 private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, "UniswapV2: LOCKED");
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function symbol() external view override returns (string memory) {
        return tokenSymbol;
    }

    function getReserves()
        public
        view
        returns (
            uint112 _reserve0,
            uint112 _reserve1,
            uint32 _blockTimestampLast
        )
    {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function _safeTransfer(
        address token,
        address to,
        uint256 value
    ) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "UniswapV2: TRANSFER_FAILED");
    }

    constructor() {
        require(SELECTOR == IERC20(address(0)).transfer.selector);
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(
        address _token0,
        address _token1,
        string memory _symbol
    ) external {
        require(msg.sender == factory, "UniswapV2: FORBIDDEN"); // sufficient check

        token0 = _token0;
        token1 = _token1;
        tokenSymbol = _symbol;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(
        uint256 _balance0,
        uint256 _balance1,
        uint112 _reserve0,
        uint112 _reserve1
    ) private {
        require(_balance0 <= type(uint112).max && _balance1 <= type(uint112).max, "UniswapV2: OVERFLOW");
        unchecked {
            uint32 blockTimestamp = uint32(block.timestamp % 2**32);
            uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
            if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
                // * never overflows, and + overflow is desired
                price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
                price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
            }
            reserve0 = uint112(_balance0);
            reserve1 = uint112(_balance1);
            blockTimestampLast = blockTimestamp;
        }
        emit Sync(reserve0, reserve1);
    }

    // if fee is on, mint liquidity equivalent to 8/25th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        IUniswapV2Factory _factory = IUniswapV2Factory(factory);
        feeOn = _factory.feesEnabled();
        uint256 _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint256 rootK = Math.sqrt(uint256(_reserve0) * _reserve1);
                uint256 rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 numerator = totalSupply * (rootK - rootKLast) * 8;
                    uint256 denominator = rootK * 17 + (rootKLast * 8);
                    uint256 liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(_factory.getFeeReceiver(), liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint256 liquidity) {
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        uint256 _balance0 = balance0();
        uint256 _balance1 = balance1();
        uint256 amount0 = _balance0 - _reserve0;
        uint256 amount1 = _balance1 - _reserve1;

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0 * amount1) - MINIMUM_LIQUIDITY;
            _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min((amount0 * _totalSupply) / _reserve0, (amount1 * _totalSupply) / _reserve1);
        }
        require(liquidity > 0, "UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED");
        _mint(to, liquidity);

        _update(_balance0, _balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0) * reserve1; // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint256 amount0, uint256 amount1) {
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        uint256 _balance0 = balance0();
        uint256 _balance1 = balance1();
        uint256 liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        require(_totalSupply != 0, "Total supply must be > 0");
        amount0 = (liquidity * _balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = (liquidity * _balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, "UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED");
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        _balance0 = balance0();
        _balance1 = balance1();

        _update(_balance0, _balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0) * reserve1; // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external lock {
        require(amount0Out > 0 || amount1Out > 0, "UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT");
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, "UniswapV2: INSUFFICIENT_LIQUIDITY");

        uint256 _balance0;
        uint256 _balance1;
        {
            // scope for _token{0,1}, avoids stack too deep errors
            address _token0 = token0;
            address _token1 = token1;
            require(to != _token0 && to != _token1, "UniswapV2: INVALID_TO");
            if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
            if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
            if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
            _balance0 = balance0();
            _balance1 = balance1();
        }
        uint256 amount0In = _balance0 > _reserve0 - amount0Out ? _balance0 - (_reserve0 - amount0Out) : 0;
        uint256 amount1In = _balance1 > _reserve1 - amount1Out ? _balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, "UniswapV2: INSUFFICIENT_INPUT_AMOUNT");
        {
            // scope for reserve{0,1}Adjusted, avoids stack too deep errors
            uint32 _swapFee = swapFee();
            uint256 balance0Adjusted = (_balance0 * 10000) - (amount0In * _swapFee);
            uint256 balance1Adjusted = (_balance1 * 10000) - (amount1In * _swapFee);
            require(balance0Adjusted * balance1Adjusted >= uint256(_reserve0) * (_reserve1 * 10000**2), "UniswapV2: K");
        }

        _update(_balance0, _balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    function swapWithDiscount(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external lock {
        require(amount0Out > 0 || amount1Out > 0, "UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT");
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, "UniswapV2: INSUFFICIENT_LIQUIDITY");

        uint256 _balance0;
        uint256 _balance1;
        {
            // scope for _token{0,1}, avoids stack too deep errors
            address _token0 = token0;
            address _token1 = token1;
            require(to != _token0 && to != _token1, "UniswapV2: INVALID_TO");
            if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
            if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
            if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
            _balance0 = balance0();
            _balance1 = balance1();
        }
        uint256 amount0In = _balance0 > _reserve0 - amount0Out ? _balance0 - (_reserve0 - amount0Out) : 0;
        uint256 amount1In = _balance1 > _reserve1 - amount1Out ? _balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, "UniswapV2: INSUFFICIENT_INPUT_AMOUNT");
        {
            ISwapDiscount discount = ISwapDiscount(factory);
            // scope for reserve{0,1}Adjusted, avoids stack too deep errors
            uint32 _swapFee = discount.swapFeeBase(to);
            uint32 _scalar = discount.feeScalar(to);
            uint256 balance0Adjusted = (_balance0 * _scalar) - (amount0In * _swapFee);
            uint256 balance1Adjusted = (_balance1 * _scalar) - (amount1In * _swapFee);
            require(balance0Adjusted * balance1Adjusted >= uint256(_reserve0) * (_reserve1 * _scalar**2), "UniswapV2: K");
        }

        _update(_balance0, _balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // gas optimized balanceOf -- avoids a redundant extcodesize check in addition to the returndatasize
    function balance0() private view returns (uint256) {
        (bool success, bytes memory data) = token0.staticcall(abi.encodeWithSelector(IERC20.balanceOf.selector, address(this)));
        require(success && data.length >= 32);
        return abi.decode(data, (uint256));
    }

    // gas optimized balanceOf -- avoids a redundant extcodesize check in addition to the returndatasize
    function balance1() private view returns (uint256) {
        (bool success, bytes memory data) = token1.staticcall(abi.encodeWithSelector(IERC20.balanceOf.selector, address(this)));
        require(success && data.length >= 32);
        return abi.decode(data, (uint256));
    }

    function swapFee() public view override returns (uint32) {
        IUniswapV2Factory _factory = IUniswapV2Factory(factory);
        return _factory.swapFee();
    }

    function swapFeeBase(address _address) public view override returns (uint32) {
        ISwapDiscount discount = ISwapDiscount(factory);
        return discount.swapFeeBase(_address);
    }

    function swapFeeScalar(address _address) public view override returns (uint32) {
        ISwapDiscount discount = ISwapDiscount(factory);
        return discount.feeScalar(_address);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, balance0() - reserve0);
        _safeTransfer(_token1, to, balance1() - reserve1);
    }

    // force reserves to match balances
    function sync() external lock {
        uint256 _balance0 = balance0(); // gas savings
        uint256 _balance1 = balance1(); // gas savings
        require(_balance0 > 0 && _balance1 > 0, "UniswapV2#sync(): balance0 or balance1 is 0");
        _update(_balance0, _balance1, reserve0, reserve1);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

interface ISwapDiscount {
    function swapFeeBase(address _address) external view returns (uint32);

    function feeScalar(address _address) external view returns (uint32);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

interface IUniswapV2Factory {
    error IdenticalAddresses();
    error ZeroAddress();
    error PairExists();
    error Unauthorized();
    error FactoryInactive();

    event ActiveChanged(bool active);
    event FeeReceiverChanged(address indexed feeReceiver);
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256 totalPairs);

    function feesEnabled() external view returns (bool);

    function getPair(address tokenA, address tokenB) external view returns (address pair);

    function getTotalPairs() external view returns (uint256);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function getFeeReceiver() external view returns (address);

    function setActive(bool newValue) external;

    function setFeeReceiver(address feeReceiver) external;

    function swapFee() external view returns (uint32);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

import "./IUniswapV2Pair.sol";

interface IPairWithDiscount is IUniswapV2Pair {
    function swapWithDiscount(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function swapFeeBase(address _address) external view returns (uint32);

    function swapFeeScalar(address _address) external view returns (uint32);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

interface IUniswapV2Callee {
    function uniswapV2Call(
        address sender,
        uint256 amount0,
        uint256 amount1,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

import {IERC20} from "../../shared/interfaces/IERC20.sol";

interface IUniswapV2ERC20 is IERC20 {
    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

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

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

interface IUniswapV2Pair {
    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to);
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

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

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function swapFee() external view returns (uint32);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

// a library for performing various math operations
library Math {
    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112
library UQ112x112 {
    error DivideByZero();

    uint224 constant Q112 = 2**112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        unchecked {
            z = uint224(y) * Q112; // never overflows
        }
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        if (y == 0) {
            revert DivideByZero();
        }
        unchecked {
            z = x / uint224(y);
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

import "./interfaces/IUniswapV2ERC20.sol";

abstract contract UniswapV2ERC20 is IUniswapV2ERC20 {
    string public constant name = "CroSwap-LP";
    uint8 public constant decimals = 18;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint256) public nonces;

    constructor() {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }

    function _mint(address to, uint256 value) internal {
        totalSupply += value;
        balanceOf[to] += value;
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint256 value) internal {
        balanceOf[from] -= value;
        totalSupply -= value;
        emit Transfer(from, address(0), value);
    }

    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] -= value;
        balanceOf[to] += value;
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        require(allowance[from][msg.sender] >= value, "ERC20: insufficient allowance");
        allowance[from][msg.sender] -= value;
        _transfer(from, to, value);
        return true;
    }

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "UniswapV2: EXPIRED");
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))));
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "UniswapV2: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.15;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 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 (uint256);

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

    function allowance(address owner, address spender) external view returns (uint256);

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

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

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

{
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "metadata": {
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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