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// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.28;

import './interfaces/IBrownFiV2Pair.sol';
import './BrownFiV2ERC20.sol';
import './libraries/Math.sol';
import '@uniswap/v3-core/contracts/libraries/FullMath.sol';
import './libraries/UQ112x112.sol';
import './interfaces/IERC20.sol';
import './interfaces/IBrownFiV2Factory.sol';
import './interfaces/IBrownFiV2Callee.sol';

contract BrownFiV2Pair is IBrownFiV2Pair, BrownFiV2ERC20 {
    using SafeMath  for uint;
    using UQ112x112 for uint224;

    uint public constant override MINIMUM_LIQUIDITY = 10**3;
    uint32 public constant PRECISION = 10**8;
    uint public constant Q64 = 1 << 64;

    address public immutable override factory;
    address public override token0;
    uint8 public token0Decimals;
    address public override token1;
    uint8 public token1Decimals;

    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

    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));
    uint public override k = uint(Q64) / 1000;   // default 0.001
    uint64 public override lambda = 0;           // default 0
    uint32 public override fee = 300_000;        // default 0.3%
    uint64 public protocolFee = 10_000_000;      // default 10%

    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'BrownFiV2: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    modifier whenNotPaused() {
        require(!IBrownFiV2Factory(factory).isPaused(), "BrownFiV2: PAUSED");
        _;
    }

    modifier onlyFactory() {
        require(msg.sender == factory, 'BrownFiV2: ONLY_FACTORY');
        _;
    }

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

    function _safeTransfer(address token, address to, uint value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'BrownFiV2: TRANSFER_FAILED');
    }

    constructor() {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, 'BrownFiV2: FORBIDDEN'); // sufficient check
        require(_token0 != address(0) && _token1 != address(0), 'BrownFiV2: ZERO_ADDRESS');
        token0 = _token0;
        token1 = _token1;
        token0Decimals = IERC20(_token0).decimals();
        token1Decimals = IERC20(_token1).decimals();
    }

    function _getPrices() internal view returns (uint price0, uint price1) {
        uint minPriceAge = IBrownFiV2Factory(factory).minPriceAge();
        price0 = IBrownFiV2Factory(factory).priceOf(token0, minPriceAge);
        price1 = IBrownFiV2Factory(factory).priceOf(token1, minPriceAge);
    }

    /**
    * @dev convert raw amount to default decimals amount
     */
    function _parseAmountToDefaultDecimals(uint8 tokenDecimals, uint amount) internal pure returns (uint formattedAmount) {
        formattedAmount = tokenDecimals > decimals ? 
            amount / 10**uint(tokenDecimals - decimals) : amount * 10**uint(decimals - tokenDecimals);
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1) private {
        require(balance0 <= type(uint112).max && balance1 <= type(uint112).max, 'BrownFiV2: OVERFLOW');
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock whenNotPaused returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20(token0).balanceOf(address(this));
        uint balance1 = IERC20(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);
        (uint price0, uint price1) = _getPrices();

        uint parsedAmount0 = _parseAmountToDefaultDecimals(token0Decimals, amount0);
        uint parsedAmount1 = _parseAmountToDefaultDecimals(token1Decimals, amount1);

        uint minValue = Math.min(parsedAmount0.mul(price0), parsedAmount1.mul(price1));

        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = minValue.mul(2) / Q64 - MINIMUM_LIQUIDITY;
           _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            uint parsedReserve0 = _parseAmountToDefaultDecimals(token0Decimals, _reserve0);
            uint parsedReserve1 = _parseAmountToDefaultDecimals(token1Decimals, _reserve1);
            liquidity = FullMath.mulDiv(
                _totalSupply,
                minValue.mul(2),
                price0.mul(parsedReserve0).add(
                    price1.mul(parsedReserve1)
                )
            );
        }
        require(liquidity > 0, 'BrownFiV2: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1);
        emit Mint(msg.sender, amount0, amount1, price0, price1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock whenNotPaused returns (uint amount0, uint amount1) {
        address _token0 = token0;                                // gas savings
        address _token1 = token1;                                // gas savings
        uint balance0 = IERC20(_token0).balanceOf(address(this));
        uint balance1 = IERC20(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];

        // bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'BrownFiV2: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1);
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock whenNotPaused {
        require(amount0Out > 0 || amount1Out > 0, 'BrownFiV2: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out.mul(10) <= uint(_reserve0).mul(8) && amount1Out.mul(10) <= uint(_reserve1).mul(8), 'BrownFiV2: INSUFFICIENT_LIQUIDITY');

        uint balance0;
        uint balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'BrownFiV2: 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) IBrownFiV2Callee(to).brownFiV2Call(msg.sender, amount0Out, amount1Out, data);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'BrownFiV2: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        (uint price0, uint price1) = _getPrices();
        (uint sPrice0, uint sPrice1) = (price0, price1);
        if (lambda > 0) {
            (sPrice0, sPrice1) = computeSkewnessPrice(_reserve0, _reserve1, price0, price1);
        }
        uint amount0OutWithoutFee = FullMath.mulDiv(amount0Out, PRECISION, PRECISION + fee);
        uint amount1OutWithoutFee = FullMath.mulDiv(amount1Out, PRECISION, PRECISION + fee);
        // check inventory
        if (amount0Out > 0) {
            checkInventory(balance0, balance1, sPrice0, sPrice1, amount0OutWithoutFee, false);
        }
        if (amount1Out > 0) {
            checkInventory(balance0, balance1, sPrice0, sPrice1, amount1OutWithoutFee, true);
        }

        _update(balance0, balance1);
        // calculate protocol fee
        if(protocolFee > 0) {
            uint lpForProtocol;
            uint _totalSupply = totalSupply;
            uint inventoryRight = computeInventoryRight(price0, price1);
            if (amount0In > 0) {
                uint _amount0In = _parseAmountToDefaultDecimals(token0Decimals, amount0In);
                uint tradingFee = FullMath.mulDiv(_amount0In, fee, PRECISION + fee);
                uint protocolFeeInDollarValue = FullMath.mulDiv(tradingFee, protocolFee * price0, PRECISION);
                lpForProtocol = FullMath.mulDiv(protocolFeeInDollarValue, _totalSupply, inventoryRight);
            }
            if (amount1In > 0) {
                uint _amount1In = _parseAmountToDefaultDecimals(token1Decimals, amount1In);
                uint tradingFee = FullMath.mulDiv(_amount1In, fee, PRECISION + fee);
                uint protocolFeeInDollarValue = FullMath.mulDiv(tradingFee, protocolFee * price1, PRECISION);
                lpForProtocol = FullMath.mulDiv(protocolFeeInDollarValue, _totalSupply, inventoryRight);
            }
            if (lpForProtocol > 0) {
                _mint(IBrownFiV2Factory(factory).feeTo(), lpForProtocol);
            }
        }
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, sPrice0, sPrice1, to);
        }
    }
    
    function computeSkewnessPrice(uint _reserve0, uint _reserve1, uint _price0, uint _price1) internal view returns (uint, uint) {
        uint _r0 = _parseAmountToDefaultDecimals(token0Decimals, _reserve0);
        uint _r1 = _parseAmountToDefaultDecimals(token1Decimals, _reserve1);
        // s = lambda * |x * px - y * py| / (x * px + y * py)
        uint reserve0Price = _r0 * _price0;
        uint reserve1Price = _r1 * _price1;
        
        uint reservePriceDiff = reserve0Price >= reserve1Price ?
            reserve0Price - reserve1Price :
            reserve1Price - reserve0Price;
        
        uint reservePriceSum = reserve0Price + reserve1Price;
        uint s = FullMath.mulDiv(reservePriceDiff, lambda, reservePriceSum);

        uint q64PlusS = Q64 + s;
        uint q64MinusS = Q64 - s;
        
        // if x * px >= y * py, px = px * (1 - s), py = py * (1 + s)
        // if x * px <= y * py, px = px * (1 + s), py = py * (1 - s)
        if (reserve0Price >= reserve1Price) {
            return (
                FullMath.mulDiv(_price0, q64MinusS, Q64),
                FullMath.mulDiv(_price1, q64PlusS, Q64)
            );
        } else {
            return (
                FullMath.mulDiv(_price0, q64PlusS, Q64),
                FullMath.mulDiv(_price1, q64MinusS, Q64)
            );
        }
    }

    function checkInventory(uint balance0, uint balance1, uint price0, uint price1, uint amountOut, bool zeroToOne) internal view {
        uint _balance0 = _parseAmountToDefaultDecimals(token0Decimals, balance0);
        uint _balance1 = _parseAmountToDefaultDecimals(token1Decimals, balance1);
        uint _amountOut = _parseAmountToDefaultDecimals(zeroToOne ? token1Decimals : token0Decimals, amountOut);
        uint left = computeInventoryLeft(_balance0, _balance1, price0, price1, _amountOut, zeroToOne);
        uint right = computeInventoryRight(price0, price1);
        require(left >= right, 'BrownFiV2: INVALID_INVENTORY');
    }

    function computeInventoryLeft(uint balance0, uint balance1, uint price0, uint price1, uint amountOut, bool zeroToOne) internal view returns (uint) {
        uint _k = k;
        uint balance = zeroToOne ? balance1 : balance0;
        uint price = zeroToOne ? price1 : price0;
        
        // Pre-calculate the denominator with one multiplication
        uint denominator = balance.mul(Q64).mul(2);
        
        return price0.mul(balance0).add(price1.mul(balance1)).sub(
            FullMath.mulDiv(
                price.mul(_k),
                amountOut.mul(amountOut),
                denominator
            )
        );
    }

    function computeInventoryRight(
        uint price0,
        uint price1
    ) internal view returns (uint) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint _r0 = _parseAmountToDefaultDecimals(token0Decimals, _reserve0);
        uint _r1 = _parseAmountToDefaultDecimals(token1Decimals, _reserve1);
        return price0.mul(_r0).add(price1.mul(_r1));
    }

    // force balances to match reserves
    function skim(address to) external lock {
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)));
    }

    function setK(uint _k) external onlyFactory {
        require(_k <= 2 * Q64, 'BrownFiV2: MAXIMUM_K');
        k = _k;
    }

    function setLambda(uint64 _lambda) external onlyFactory {
        require(_lambda <= Q64, 'BrownFiV2: MAXIMUM_LAMBDA'); // max 1
        lambda = _lambda;
    }

    function setFee(uint32 _fee) external onlyFactory {
        fee = _fee;
    }

    function setProtocolFee(uint32 _protocolFee) external onlyFactory {
        protocolFee = _protocolFee;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @title Contains 512-bit math functions
/// @notice Facilitates multiplication and division that can have overflow of an intermediate value without any loss of precision
/// @dev Handles "phantom overflow" i.e., allows multiplication and division where an intermediate value overflows 256 bits
library FullMath {
    /// @notice Calculates floor(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
    /// @param a The multiplicand
    /// @param b The multiplier
    /// @param denominator The divisor
    /// @return result The 256-bit result
    /// @dev Credit to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv
    function mulDiv(
        uint256 a,
        uint256 b,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = a * b
            // Compute the product mod 2**256 and mod 2**256 - 1
            // then use the Chinese Remainder Theorem to reconstruct
            // the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2**256 + prod0
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(a, b, not(0))
                prod0 := mul(a, b)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division
            if (prod1 == 0) {
                require(denominator > 0);
                assembly {
                    result := div(prod0, denominator)
                }
                return result;
            }

            // Make sure the result is less than 2**256.
            // Also prevents denominator == 0
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0]
            // Compute remainder using mulmod
            uint256 remainder;
            assembly {
                remainder := mulmod(a, b, denominator)
            }
            // Subtract 256 bit number from 512 bit number
            assembly {
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator
            // Compute largest power of two divisor of denominator.
            // Always >= 1.
            uint256 twos = (0 - denominator) & denominator;
            // Divide denominator by power of two
            assembly {
                denominator := div(denominator, twos)
            }

            // Divide [prod1 prod0] by the factors of two
            assembly {
                prod0 := div(prod0, twos)
            }
            // Shift in bits from prod1 into prod0. For this we need
            // to flip `twos` such that it is 2**256 / twos.
            // If twos is zero, then it becomes one
            assembly {
                twos := add(div(sub(0, twos), twos), 1)
            }
            prod0 |= prod1 * twos;

            // Invert denominator mod 2**256
            // Now that denominator is an odd number, it has an inverse
            // modulo 2**256 such that denominator * inv = 1 mod 2**256.
            // Compute the inverse by starting with a seed that is correct
            // correct for four bits. That is, denominator * inv = 1 mod 2**4
            uint256 inv = (3 * denominator) ^ 2;
            // Now use Newton-Raphson iteration to improve the precision.
            // Thanks to Hensel's lifting lemma, this also works in modular
            // arithmetic, doubling the correct bits in each step.
            inv *= 2 - denominator * inv; // inverse mod 2**8
            inv *= 2 - denominator * inv; // inverse mod 2**16
            inv *= 2 - denominator * inv; // inverse mod 2**32
            inv *= 2 - denominator * inv; // inverse mod 2**64
            inv *= 2 - denominator * inv; // inverse mod 2**128
            inv *= 2 - denominator * inv; // inverse mod 2**256

            // Because the division is now exact we can divide by multiplying
            // with the modular inverse of denominator. This will give us the
            // correct result modulo 2**256. Since the precoditions guarantee
            // that the outcome is less than 2**256, this is the final result.
            // We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inv;
            return result;
        }
    }

    /// @notice Calculates ceil(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
    /// @param a The multiplicand
    /// @param b The multiplier
    /// @param denominator The divisor
    /// @return result The 256-bit result
    function mulDivRoundingUp(
        uint256 a,
        uint256 b,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            result = mulDiv(a, b, denominator);
            if (mulmod(a, b, denominator) > 0) {
                require(result < type(uint256).max);
                result++;
            }
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.28;

import './interfaces/IBrownFiV2ERC20.sol';
import './libraries/SafeMath.sol';

contract BrownFiV2ERC20 is IBrownFiV2ERC20 {
    using SafeMath for uint;

    string public constant override name = 'BrownFi V2';
    string public constant override symbol = 'BF-V2';
    uint8 public constant override decimals = 18;
    uint  public override totalSupply;
    mapping(address => uint) public override balanceOf;
    mapping(address => mapping(address => uint)) public override allowance;

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

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

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

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

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

    function _transfer(address from, address to, uint value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

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

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

    function transferFrom(address from, address to, uint value) external override returns (bool) {
        if (allowance[from][msg.sender] != type(uint256).max) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external override {
        require(deadline >= block.timestamp, 'BrownFiV2: 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, 'BrownFiV2: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

interface IBrownFiV2Callee {
    function brownFiV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

interface IBrownFiV2ERC20 {
    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;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

interface IBrownFiV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint totalPair);
    event PauseStateChanged(bool paused);
    event PriceOracleUpdated(address indexed newOracle);
    event FeeToUpdated(address indexed newFeeTo);
    event OracleOfUpdated(address indexed token, bytes32 priceFeedId);
    event MinPriceAgeUpdated(uint newMinPriceAge);
    event KOfPairUpdated(address indexed tokenA, address indexed tokenB, uint k);
    event FeeOfPairUpdated(address indexed tokenA, address indexed tokenB, uint32 fee);
    event LambdaOfPairUpdated(address indexed tokenA, address indexed tokenB, uint64 lambda);
    event ProtocolFeeOfPairUpdated(address indexed tokenA, address indexed tokenB, uint32 protocolFee);

    function priceOracle() external view returns (address);
    function feeTo() external view returns (address);
    function priceOf(address token, uint256 priceAge) external view returns(uint256);
    function minPriceAge() external view returns (uint);
    function priceFeedIds(address token) external view returns (bytes32);

    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, bytes32 priceFeedA, bytes32 priceFeedB) external returns (address pair);

    function setPriceOracle(address newOracle) external;
    function setFeeTo(address) external;
    function setOracleOf(address token, bytes32 priceFeedId) external;
    function setMinPriceAge(uint age) external;
    function setKOfPair(address tokenA, address tokenB, uint k) external;
    function setFeeOfPair(address tokenA, address tokenB, uint32 fee) external;
    function setLambdaOfPair(address tokenA, address tokenB, uint64 lambda) external;
    function setProtocolFeeOfPair(address tokenA, address tokenB, uint32 protocolFee) external;

    function setPaused(bool paused) external;
    function isPaused() external view returns (bool);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

interface IBrownFiV2Pair {
    event Mint(address indexed sender, uint amount0, uint amount1, uint price0, uint price1, address indexed to);
    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,
        uint price0,
        uint price1,
        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 k() external view returns (uint);
    function lambda() external view returns (uint64);
    function fee() external view returns (uint32);

    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 setK(uint _k) external;
    function setFee(uint32 _fee) external;
    function setLambda(uint64 _lambda) external;
    function setProtocolFee(uint32 _protocolFee) external;

    function initialize(address, address) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

interface IERC20 {
    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);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.28;

// a library for performing various math operations

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

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

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.28;

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

library SafeMath {
    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');
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.28;

// 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);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "viaIR": true,
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount1","type":"uint256"},{"indexed":true,"internalType":"address","name":"to","type":"address"}],"name":"Burn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount1","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price1","type":"uint256"},{"indexed":true,"internalType":"address","name":"to","type":"address"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount0In","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount1In","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount0Out","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount1Out","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price1","type":"uint256"},{"indexed":true,"internalType":"address","name":"to","type":"address"}],"name":"Swap","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint112","name":"reserve0","type":"uint112"},{"indexed":false,"internalType":"uint112","name":"reserve1","type":"uint112"}],"name":"Sync","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MINIMUM_LIQUIDITY","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PRECISION","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"Q64","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"burn","outputs":[{"internalType":"uint256","name":"amount0","type":"uint256"},{"internalType":"uint256","name":"amount1","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fee","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getReserves","outputs":[{"internalType":"uint112","name":"_reserve0","type":"uint112"},{"internalType":"uint112","name":"_reserve1","type":"uint112"},{"internalType":"uint32","name":"_blockTimestampLast","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token0","type":"address"},{"internalType":"address","name":"_token1","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"k","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lambda","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"mint","outputs":[{"internalType":"uint256","name":"liquidity","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"protocolFee","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"_fee","type":"uint32"}],"name":"setFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_k","type":"uint256"}],"name":"setK","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint64","name":"_lambda","type":"uint64"}],"name":"setLambda","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_protocolFee","type":"uint32"}],"name":"setProtocolFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"skim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount0Out","type":"uint256"},{"internalType":"uint256","name":"amount1Out","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"swap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sync","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"token0","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token0Decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token1","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token1Decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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