// SPDX-License-Identifier: GPL-3.0
pragma solidity =0.5.16;

import "./interfaces/IZFPair.sol";
import "./interfaces/IUniswapV2Callee.sol";
import "./ZFERC20.sol";
import "./libraries/Math.sol";
import "./libraries/UQ112x112.sol";
import "./interfaces/IERC20.sol";
import "./interfaces/IZFFactory.sol";
import "./libraries/SafeMath.sol";

contract ZFPair is IZFPair, ZFERC20 {
    using SafeMath for uint256;
    using UQ112x112 for uint224;

    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));

    uint256 private constant SWAP_FEE_POINT_PRECISION_SQ = 10000_0000;
    uint256 private constant SWAP_FEE_POINT_PRECISION = 10000;
    uint256 private constant PROTOCOL_FEE_POINT_PRECISION = 10000;
    uint256 private constant MINIMUM_LIQUIDITY = 10 ** 3;
    uint16 private constant SWAP_FEE_INHERIT = uint16(-1);
    uint16 private constant PROTOCOL_FEE_INHERIT = uint16(-1);

    address public 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

    uint16 public swapFeeOverride = SWAP_FEE_INHERIT;
    uint16 public protocolFeeOverride = PROTOCOL_FEE_INHERIT;

    uint256 private unlocked = 1;

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

    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);

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, "ZF: FORBIDDEN"); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

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

    function getReservesSimple() external view returns (uint112, uint112) {
        return (reserve0, reserve1);
    }

    function getSwapFee() public view returns (uint16) {
        uint16 _swapFeeOverride = swapFeeOverride;
        return _swapFeeOverride == SWAP_FEE_INHERIT ? IZFFactory(factory).swapFee() : _swapFeeOverride;
    }

    function getProtocolFee() public view returns (uint256) {
        uint16 _protocolFeeOverride = protocolFeeOverride;
        return _protocolFeeOverride == PROTOCOL_FEE_INHERIT ? IZFFactory(factory).protocolFee() : _protocolFeeOverride;
    }

    function getReservesAndParameters() external view returns (uint112 _reserve0, uint112 _reserve1, uint16 _swapFee) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _swapFee = getSwapFee();
    }

    function _getBalances(address _token0, address _token1) private view returns (uint256, uint256) {
        return (IERC20(_token0).balanceOf(address(this)), IERC20(_token1).balanceOf(address(this)));
    }

    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))), "ZF: TRANSFER_FAILED");
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), "ZF: OVERFLOW");

        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);
    }

    function _getFeeLiquidity(uint256 _totalSupply, uint256 _rootK2, uint256 _rootK1) private view returns (uint256) {
        uint256 _protocolFee = getProtocolFee();
        uint256 numerator = _totalSupply.mul(_rootK2.sub(_rootK1)).mul(_protocolFee);
        uint256 denominator =
            (PROTOCOL_FEE_POINT_PRECISION.sub(_protocolFee)).mul(_rootK2).add(_rootK1.mul(_protocolFee));
        return numerator / denominator;
    }

    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address _feeTo = IZFFactory(factory).feeTo();
        feeOn = _feeTo != address(0);
        uint256 _kLast = kLast;
        if (feeOn) {
            if (_kLast != 0) {
                uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));
                uint256 rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 liquidity = _getFeeLiquidity(totalSupply, rootK, rootKLast);
                    if (liquidity > 0) _mint(_feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    /// @dev 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();
        (uint256 balance0, uint256 balance1) = _getBalances(token0, token1);
        uint256 amount0 = balance0.sub(_reserve0);
        uint256 amount1 = balance1.sub(_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.mul(amount1)).sub(MINIMUM_LIQUIDITY);
            _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, "ZF: INSUFFICIENT_LIQUIDITY_MINTED");
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date

        emit Mint(msg.sender, amount0, amount1);
    }

    /// @dev 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, address _token1) = (token0, token1);
        (uint256 balance0, uint256 balance1) = _getBalances(_token0, _token1);
        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

        // using balances ensures pro-rata distribution
        amount0 = liquidity.mul(balance0) / _totalSupply;
        amount1 = liquidity.mul(balance1) / _totalSupply;
        require(amount0 > 0 && amount1 > 0, "ZF: INSUFFICIENT_LIQUIDITY_BURNED");

        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);

        (balance0, balance1) = _getBalances(_token0, _token1);
        _update(balance0, balance1, _reserve0, _reserve1);

        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date

        emit Burn(msg.sender, amount0, amount1, to);
    }

    /// @dev 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, "ZF: INSUFFICIENT_OUTPUT_AMOUNT");
        (uint112 _reserve0, uint112 _reserve1,) = getReserves();
        require(amount0Out < _reserve0 && amount1Out < _reserve1, "ZF: INSUFFICIENT_LIQUIDITY");

        uint256 balance0;
        uint256 balance1;
        {
            // scope for _token{0,1}, avoids stack too deep errors
            (address _token0, address _token1) = (token0, token1);

            require(to != _token0 && to != _token1, "ZF: 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, balance1) = _getBalances(_token0, _token1);
        }

        // At least one input is required.
        uint256 amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint256 amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, "ZF: INSUFFICIENT_INPUT_AMOUNT");

        {
            // Checks the K.
            uint16 _swapFee = getSwapFee();
            uint256 balance0Adjusted = (balance0.mul(SWAP_FEE_POINT_PRECISION).sub(amount0In.mul(_swapFee)));
            uint256 balance1Adjusted = (balance1.mul(SWAP_FEE_POINT_PRECISION).sub(amount1In.mul(_swapFee)));

            require(
                balance0Adjusted.mul(balance1Adjusted)
                    >= uint256(_reserve0).mul(_reserve1).mul(SWAP_FEE_POINT_PRECISION_SQ),
                "ZF: K"
            );
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    /**
     * @dev Force balances to match reserves, taking out positive balances
     */
    function skim(address to) external lock {
        address _token0 = token0;
        address _token1 = token1;
        (uint256 balance0, uint256 balance1) = _getBalances(_token0, _token1);
        _safeTransfer(_token0, to, balance0.sub(reserve0));
        _safeTransfer(_token1, to, balance1.sub(reserve1));
    }

    /**
     * @dev Force reserves to match balances
     */
    function sync() external lock {
        (uint256 balance0, uint256 balance1) = _getBalances(token0, token1);
        _update(balance0, balance1, reserve0, reserve1);
    }

    /// @dev called by the factory to set the swapFeeOverride
    function setSwapFeeOverride(uint16 _swapFeeOverride) external {
        require(msg.sender == factory, "ZF: FORBIDDEN");
        require(_swapFeeOverride <= 1000 || _swapFeeOverride == SWAP_FEE_INHERIT, "INVALID_FEE"); //max 10%
        swapFeeOverride = _swapFeeOverride;
    }

    /// @dev Called by factory to set pair-specific protocol fee
    function setProtocolFeeOverride(uint16 _protocolFee) external {
        require(msg.sender == factory, "ZF: FORBIDDEN");
        require(_protocolFee <= PROTOCOL_FEE_POINT_PRECISION, "INVALID PROTOCOL_FEE"); // max 100%
        protocolFeeOverride = _protocolFee;
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0;

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

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

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

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

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

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

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

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

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

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

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

    // function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

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

    function getReservesAndParameters() external view returns (uint112 reserve0, uint112 reserve1, uint16 swapFee);

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

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

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

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

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

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

pragma solidity >=0.5.0;

/// @dev Uniswap V2 callee interface
interface IUniswapV2Callee {
    function uniswapV2Call(address sender, uint256 amount0, uint256 amount1, bytes calldata data) external;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity =0.5.16;

import "./interfaces/IZFERC20.sol";
import "./libraries/SafeMath.sol";

contract ZFERC20 is IZFERC20 {
    using SafeMath for uint256;

    string public constant name = "zkSwap Finance LPs";
    string public constant symbol = "ZF-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;

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

    constructor() public {
        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 = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(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] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(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) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(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, "ZF: 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, "ZF: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity =0.5.16;

// 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
pragma solidity =0.5.16;

// 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 {
    uint224 constant Q112 = 2 ** 112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        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) {
        z = x / uint224(y);
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0;

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);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0;

interface IZFFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

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

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

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

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;

    function INIT_CODE_PAIR_HASH() external view returns (bytes32);

    function swapFee() external view returns (uint16);

    function protocolFee() external view returns (uint16);

    function setSwapFee(uint16 newFee) external;

    function setProtocolFee(uint16 newFee) external;

    function setSwapFeeOverride(address pair, uint16 swapFeeOverride) external;

    function setProtocolFeeOverride(address pair, uint16 protocolFeeOverride) external;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0 <0.7.0;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, "ds-math-add-overflow");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "ds-math-sub-underflow");
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0;

interface IZFERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

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

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

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

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

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

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

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

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

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}

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