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/*

 █▀ █▀█ █▄░█ █ █▀▀ █▀▀ ▄▀█ █▀▀ ▀█▀ █▀█ █▀█ █▄█
 ▄█ █▄█ █░▀█ █ █▄▄ █▀░ █▀█ █▄▄ ░█░ █▄█ █▀▄ ░█░

  Trade on SonicFactory and have fun!
  Web:      https://sonicfactory.fun/

*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.24;

import "./libraries/UQ112x112.sol";
import "./interfaces/IERC20.sol";
import "./interfaces/IWETH.sol";
import "./interfaces/IIncubator.sol";

contract UniswapV2Pair {
  using UQ112x112 for uint224;

  address private immutable INCUBATOR;
  address private _CREATOR;
  address private _REFERRAL;
  address private _WETH;
  address private _TOKEN;
  address public immutable token0;
  address public immutable token1;

  bool private _initialized;
  bool private _AUTOESCAPE;
  uint8 private locked;
  uint24 private _FEE;
  uint24 private _TAX;
  uint24 private _REF;
  uint32 private _LAUNCH;
  uint32 private blockTimestampLast;
  uint112 private _ETH_RESERVE_VIRTUAL_INITIAL;
  uint112 private _ETH_RESERVE_ESCAPE_TARGET;
  uint112 private _TOKEN_INITIAL_RESERVE;
  uint112 private reserve0;
  uint112 private reserve1;
  uint256 public price0CumulativeLast;
  uint256 public price1CumulativeLast;

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

  error ErrorLocked();
  error ErrorAutoEscape();
  error ErrorNotLaunched();
  error ErrorUnauthorized(address sender);
  error ErrorAlreadyInitialized();
  error ErrorInsufficientReserves();
  error ErrorSwapInsufficientInput();
  error ErrorSwapInsufficientOutput();
  error ErrorSwapInsufficientLiquidity();
  error ErrorSwapInvalidRecipient();
  error ErrorTransfer(address to, uint256 amount);

  modifier lock() {
    if (locked >= 1) { revert ErrorLocked(); }

    locked = 1;

    _;

    if (locked == 1) { locked = 0; }
  }

  modifier isLaunched() {
    if (_LAUNCH > _timestamp()) { revert ErrorNotLaunched(); }

    _;
  }

  constructor(address incubator, address _token0, address _token1) payable {
    INCUBATOR = incubator;
    token0 = _token0;
    token1 = _token1;
  }

  function initializePair(address creator, uint24 fee, uint24 tax, uint24 ref, uint32 launch, uint112 tokenInitialReserve, uint112 ethInitialVirtualReserve, uint112 ethReserveEscapeTarget, address WETH, address referral, bool autoEscape) external {
    if (msg.sender != INCUBATOR) { revert ErrorUnauthorized(msg.sender); }
    if (_initialized) { revert ErrorAlreadyInitialized(); }

    _CREATOR = creator;
    _FEE = fee;
    _TAX = tax;
    _LAUNCH = launch;
    _ETH_RESERVE_VIRTUAL_INITIAL = ethInitialVirtualReserve;
    _ETH_RESERVE_ESCAPE_TARGET = ethReserveEscapeTarget;
    _TOKEN_INITIAL_RESERVE = tokenInitialReserve;
    _WETH = WETH;
    _TOKEN = token0 == _WETH ? token1 : token0;
    _AUTOESCAPE = autoEscape;

    if (referral != address(0) && referral != creator) {
      _REF = ref;
      _REFERRAL = referral;
    }

    _initialized = true;
    _update(token0 == _WETH ? uint256(ethInitialVirtualReserve) : uint256(_TOKEN_INITIAL_RESERVE), token0 == _WETH ? uint256(_TOKEN_INITIAL_RESERVE) : uint256(ethInitialVirtualReserve), 0, 0);
  }

  function FEE() external view returns (uint24) {
    return _FEE;
  }

  function TAX() external view returns (uint24) {
    return _TAX;
  }

  function ETH_INITIAL_VIRTUAL_RESERVE() external view returns (uint112) {
    return _ETH_RESERVE_VIRTUAL_INITIAL;
  }

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

  function sync() external lock {
    uint256 balance0;
    uint256 balance1;

    unchecked {
      balance0 = IERC20(token0).balanceOf(address(this)) + (token0 == _WETH ? uint256(_ETH_RESERVE_VIRTUAL_INITIAL) : 0);
      balance1 = IERC20(token1).balanceOf(address(this)) + (token1 == _WETH ? uint256(_ETH_RESERVE_VIRTUAL_INITIAL) : 0);
    }

    _update(balance0, balance1, reserve0, reserve1);
  }

  function swap(address to, address tokenIn) external payable isLaunched lock {
    if (to == token0 || to == token1) { revert ErrorSwapInvalidRecipient(); }

    bool buy = tokenIn == _WETH;
    uint256 amountInEffective;
    uint256 amountOutEffective;
    uint256 amountIn;
    uint256 amountOut;
    uint256 ethAmount;
    uint256 feeAmount;
    uint256 taxAmount;
    uint256 refAmount;

    if (buy) {
      amountIn = msg.value;
      amountInEffective = _percentage(amountIn, 100_000 - uint256(_FEE + _TAX));
      ethAmount = amountIn;

      if (_FEE > 0 || _TAX > 0) {
        if (_FEE > 0) {
          unchecked {
            feeAmount = _percentage(amountIn, uint256(_FEE));

            if (_REF > 0) {
              refAmount = _percentage(feeAmount, uint256(_REF));
              feeAmount -= refAmount;
            }
          }
        }

        if (_TAX > 0) { taxAmount = _percentage(amountIn, uint256(_TAX)); }
      }

      IWETH(_WETH).deposit{ value: amountInEffective }();
      IWETH(_WETH).transfer(address(this), amountInEffective);
    } else {
      unchecked {
        amountIn = amountInEffective = IERC20(tokenIn).balanceOf(address(this)) - uint256(token0 == tokenIn ? reserve0 : reserve1);
      }
    }

    if (amountIn == 0) { revert ErrorSwapInsufficientInput(); }

    (uint112 reserveIn, uint112 reserveOut) = token0 == tokenIn ? (reserve0, reserve1) : (reserve1, reserve0);

    unchecked {
      amountOut = amountOutEffective = (amountInEffective * uint256(reserveOut)) / (uint256(reserveIn) + amountInEffective);
    }

    if (amountOut == 0) { revert ErrorSwapInsufficientOutput(); }
    if (amountOut > uint256(reserveOut)) { revert ErrorSwapInsufficientLiquidity(); }

    if (tokenIn == _TOKEN) {
      unchecked {
        amountOutEffective = _percentage(amountOut, 100_000 - uint256(_FEE + _TAX));
      }

      IWETH(_WETH).withdraw(amountOut);

      ethAmount = amountOut;

      if (_FEE > 0 || _TAX > 0) {
        if (_FEE > 0) {
          unchecked {
            feeAmount = _percentage(amountOut, uint256(_FEE));

            if (_REF > 0) {
              refAmount = _percentage(feeAmount, uint256(_REF));
              feeAmount -= refAmount;
            }
          }
        }

        if (_TAX > 0) { taxAmount = _percentage(amountOut, uint256(_TAX)); }
      }
    }

    if (_FEE > 0 || _TAX > 0) {
      if (feeAmount > 0) {
        _withdrawETH(INCUBATOR, feeAmount);

        if (refAmount > 0) { _withdrawETH(_REFERRAL, refAmount); }
      }

      if (taxAmount > 0) { _withdrawETH(_CREATOR, taxAmount); }
    }

    uint256 tokenAmount = buy ? amountOut : amountIn;

    { // scope to avoid "stack too deep" error
      address _to = to;

      bool _buy = buy;
      uint256 _amountOutEffective = amountOutEffective;
      uint256 _ethAmount = ethAmount;
      uint256 _tokenAmount = tokenAmount;
      uint256 _feeAmount = feeAmount;
      uint256 _taxAmount = taxAmount;
      uint256 _refAmount = refAmount;

      if (_buy) {
        IERC20(_TOKEN).transfer(_to, _amountOutEffective);
      } else{
        _withdrawETH(_to, _amountOutEffective);
      }

      (uint112 ethReserve, uint112 tokenReserve) = _getReserves();

      IIncubator(INCUBATOR).pairSwap(_to, _buy, ethReserve, tokenReserve, _ethAmount, _tokenAmount, _feeAmount, _taxAmount, _refAmount);
    }

    uint256 balance0;
    uint256 balance1;

    unchecked {
      balance0 = IERC20(token0).balanceOf(address(this)) + (token0 == _WETH ? uint256(_ETH_RESERVE_VIRTUAL_INITIAL) : 0);
      balance1 = IERC20(token1).balanceOf(address(this)) + (token1 == _WETH ? uint256(_ETH_RESERVE_VIRTUAL_INITIAL) : 0);
    }

    _update(balance0, balance1, reserve0, reserve1);

    if (tokenIn == token0) {
      emit Swap(msg.sender, amountIn, 0, 0, amountOut, to);
    } else {
      emit Swap(msg.sender, 0, amountIn, amountOut, 0, to);
    }

    if (buy && _AUTOESCAPE) {
      unchecked {
        if ((token0 == _WETH ? balance0 : balance1) - uint256(_ETH_RESERVE_VIRTUAL_INITIAL) >= uint256(_ETH_RESERVE_ESCAPE_TARGET)) { _escape(); }
      }
    }
  }

  function escape() external isLaunched lock {
    if (msg.sender != _CREATOR) { revert ErrorUnauthorized(msg.sender); }
    if (_AUTOESCAPE) { revert ErrorAutoEscape(); }

    unchecked {
      if ((token0 == _WETH ? reserve0 : reserve1) - uint256(_ETH_RESERVE_VIRTUAL_INITIAL) < uint256(_ETH_RESERVE_ESCAPE_TARGET)) { revert ErrorInsufficientReserves(); }
    }

    _escape();
  }

  function _getReserves() private view returns (uint112 ethReserve, uint112 tokenReserve) {
    ethReserve = token0 == _WETH ? reserve0 : reserve1;
    tokenReserve = token0 == _WETH ? reserve1 : reserve0;
  }

  function _update(uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1) private {
    uint32 blockTimestamp = _timestamp();

    unchecked {
      uint32 timeElapsed = blockTimestamp - blockTimestampLast;

      if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
        price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
        price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
      }
    }

    reserve0 = uint112(balance0);
    reserve1 = uint112(balance1);
    blockTimestampLast = blockTimestamp;
    blockTimestampLast = _timestamp();

    emit Sync(reserve0, reserve1);
  }

  function _withdrawETH(address to, uint256 value) private {
    (bool success,) = payable(to).call{ value: value }("");

    if (!success) { revert ErrorTransfer(to, value); }
  }

  function _escape() private {
    locked = 2;

    delete _FEE;
    delete _TAX;
    delete _REF;

    uint256 balance0 = IERC20(token0).balanceOf(address(this));
    uint256 balance1 = IERC20(token1).balanceOf(address(this));

    (uint256 tokenAmount, uint256 ethAmount) = token0 == _WETH ? (balance1, balance0) : (balance0, balance1);

    IERC20(_TOKEN).transfer(INCUBATOR, tokenAmount);
    IWETH(_WETH).withdraw(ethAmount);
    IIncubator(INCUBATOR).tokenEscape{ value: ethAmount }(tokenAmount);

    _update(0, 0, reserve0, reserve1);
  }

  function _percentage(uint256 value, uint256 bps) private pure returns (uint256) {
    unchecked {
      return (value * bps) / 100_000;
    }
  }

  function _timestamp() private view returns (uint32) {
    unchecked {
      return uint32(block.timestamp % 2**32);
    }
  }

  receive() external payable {
    require(msg.sender == _WETH);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.24;

interface IIncubator {
  function pairSwap(address user, bool buy, uint112 ethReserve, uint112 tokenReserve, uint256 ethAmount, uint256 tokenAmount, uint256 feeAmount, uint256 taxAmount, uint256 refAmount) external;
  function tokenEscape(uint256 tokenAmount) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.24;

interface IWETH {
  function deposit() external payable;
  function transfer(address to, uint256 value) external returns (bool);
  function withdraw(uint256) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.24;

interface IERC20 {
  function balanceOf(address owner) external view returns (uint256);
  function transfer(address to, uint256 value) external returns (bool);
  function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.24;

library UQ112x112 {
  uint224 constant Q112 = 2**112;

  function encode(uint112 y) internal pure returns (uint224 z) {
    unchecked {
      z = uint224(y) * Q112;
    }
  }

  function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
    unchecked {
      z = x / uint224(y);
    }
  }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 9999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": [],
  "evmVersion": "cancun"
}

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[{"inputs":[{"internalType":"address","name":"incubator","type":"address"},{"internalType":"address","name":"_token0","type":"address"},{"internalType":"address","name":"_token1","type":"address"}],"stateMutability":"payable","type":"constructor"},{"inputs":[],"name":"ErrorAlreadyInitialized","type":"error"},{"inputs":[],"name":"ErrorAutoEscape","type":"error"},{"inputs":[],"name":"ErrorInsufficientReserves","type":"error"},{"inputs":[],"name":"ErrorLocked","type":"error"},{"inputs":[],"name":"ErrorNotLaunched","type":"error"},{"inputs":[],"name":"ErrorSwapInsufficientInput","type":"error"},{"inputs":[],"name":"ErrorSwapInsufficientLiquidity","type":"error"},{"inputs":[],"name":"ErrorSwapInsufficientOutput","type":"error"},{"inputs":[],"name":"ErrorSwapInvalidRecipient","type":"error"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"ErrorTransfer","type":"error"},{"inputs":[{"internalType":"address","name":"sender","type":"address"}],"name":"ErrorUnauthorized","type":"error"},{"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":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"},{"inputs":[],"name":"ETH_INITIAL_VIRTUAL_RESERVE","outputs":[{"internalType":"uint112","name":"","type":"uint112"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FEE","outputs":[{"internalType":"uint24","name":"","type":"uint24"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TAX","outputs":[{"internalType":"uint24","name":"","type":"uint24"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"escape","outputs":[],"stateMutability":"nonpayable","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":"creator","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"uint24","name":"tax","type":"uint24"},{"internalType":"uint24","name":"ref","type":"uint24"},{"internalType":"uint32","name":"launch","type":"uint32"},{"internalType":"uint112","name":"tokenInitialReserve","type":"uint112"},{"internalType":"uint112","name":"ethInitialVirtualReserve","type":"uint112"},{"internalType":"uint112","name":"ethReserveEscapeTarget","type":"uint112"},{"internalType":"address","name":"WETH","type":"address"},{"internalType":"address","name":"referral","type":"address"},{"internalType":"bool","name":"autoEscape","type":"bool"}],"name":"initializePair","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"price0CumulativeLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price1CumulativeLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"address","name":"tokenIn","type":"address"}],"name":"swap","outputs":[],"stateMutability":"payable","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":"token1","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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