// SPDX-License-Identifier: MIT

/*

    Decentralized asset management powerhouse. Optimizing yields, simplifying DeFi strategies, and leading the charge in tokenized, yield-bearing vaults

    Pocus is a platform for decentralized asset management that offers tokenized yield-bearing vaults of strategies.

    We aim to simplify DeFi strategy building for retail investors to invest in new crypto market narratives. Our goal is to enable investors to achieve maximum profits with clear and managed risks.

    Web: https://pocus.finance
    App: https://app.pocus.finance
    X: https://twitter.com/PocusFinance
    Tg: https://t.me/pocus_finance_official
    Docs: https://medium.com/@pocus.finance

 */

pragma solidity 0.8.19;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    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);
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address _uniswapPair);
}library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    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;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

abstract contract Ownable {
    address internal _owner;

    constructor(address owner) {
        _owner = owner;
    }

    modifier onlyOwner() {
        require(_isOwner(msg.sender), "!OWNER");
        _;
    }

    function _isOwner(address account) internal view returns (bool) {
        return account == _owner;
    }

    function renounceOwnership() public onlyOwner {
        _owner = address(0);
        emit OwnershipTransferred(address(0));
    }

    event OwnershipTransferred(address owner);
}

interface IUniswapV2Router {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract POCUS is IERC20, Ownable {
    using SafeMath for uint256;

    string constant _name = "Pocus Finance";
    string constant _symbol = "POCUS";

    uint8 constant _decimals = 9;
    uint256 _totalSupply = 10 ** 9 * (10 ** _decimals);

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) _noTaxAddress;
    mapping (address => bool) _noMaxTxAddress;

    bool private _swapEnabled = true;
    uint256 private _minSwapThreshold = _totalSupply / 100000; // 0.1%
    bool _swapping;

    address _routerAddr = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address _deadAddress = 0x000000000000000000000000000000000000dEaD;

    uint256 private _maxTxAmount = (_totalSupply * 25) / 1000;
    address private _taxAddress;
    IUniswapV2Router _uniswapRouter;
    address _uniswapPair;

    uint256 _taxLiq = 0; 
    uint256 _taxMarket = 22;
    uint256 _taxTotal = _taxLiq + _taxMarket;
    uint256 _denominator = 100;

    modifier lockSwap() { _swapping = true; _; _swapping = false; }

    constructor (address PocusAddress) Ownable(msg.sender) {
        _uniswapRouter = IUniswapV2Router(_routerAddr);
        _uniswapPair = IUniswapV2Factory(_uniswapRouter.factory()).createPair(_uniswapRouter.WETH(), address(this));
        _allowances[address(this)][address(_uniswapRouter)] = type(uint256).max;
        address _owner = _owner;
        _taxAddress = PocusAddress;
        _noTaxAddress[_taxAddress] = true;
        _noMaxTxAddress[_owner] = true;
        _noMaxTxAddress[_taxAddress] = true;
        _noMaxTxAddress[_deadAddress] = true;
        _balances[_owner] = _totalSupply;
        emit Transfer(address(0), _owner, _totalSupply);
    }

    receive() external payable { }
    
    function performPocusSwap() internal lockSwap {
        uint256 contractTokenBalance = balanceOf(address(this));
        uint256 tokensToLp = contractTokenBalance.mul(_taxLiq).div(_taxTotal).div(2);
        uint256 amountToSwap = contractTokenBalance.sub(tokensToLp);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _uniswapRouter.WETH();

        _uniswapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );
        uint256 amountETH = address(this).balance;
        uint256 totalFeeTokens = _taxTotal.sub(_taxLiq.div(2));
        uint256 ethToLp = amountETH.mul(_taxLiq).div(totalFeeTokens).div(2);
        uint256 ethToMarketing = amountETH.mul(_taxMarket).div(totalFeeTokens);

        payable(_taxAddress).transfer(ethToMarketing);
        if(tokensToLp > 0){
            _uniswapRouter.addLiquidityETH{value: ethToLp}(
                address(this),
                tokensToLp,
                0,
                0,
                _taxAddress,
                block.timestamp
            );
        }
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        if(_swapping){ return _transferBasic(sender, recipient, amount); }
        
        if (recipient != _uniswapPair && recipient != _deadAddress) {
            require(_noMaxTxAddress[recipient] || _balances[recipient] + amount <= _maxTxAmount, "Transfer amount exceeds the bag size.");
        }        
        if(_verifySwapBack(sender, recipient, amount)){ 
            performPocusSwap(); 
        } 
        bool shouldTax = _shouldChargeTax(sender);
        if (shouldTax) {
            _balances[recipient] = _balances[recipient].add(_sendingAmt(sender, amount));
        } else {
            _balances[recipient] = _balances[recipient].add(amount);
        }

        emit Transfer(sender, recipient, amount);
        return true;
    }

    function _transferBasic(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }
    
    function updatePocusTax(uint256 lpFee, uint256 devFee) external onlyOwner {
         _taxLiq = lpFee; 
         _taxMarket = devFee;
         _taxTotal = _taxLiq + _taxMarket;
    }    
    
    function _checkIfSellTx(address recipient) private view returns (bool){
        return recipient == _uniswapPair;
    }

    function _checkIfSwap() internal view returns (bool) {
        return !_swapping
        && _swapEnabled
        && _balances[address(this)] >= _minSwapThreshold;
    }
    
    function adjustPocusWalletSize(uint256 percent) external onlyOwner {
        _maxTxAmount = (_totalSupply * percent) / 1000;
    }

    function totalSupply() external view override returns (uint256) { return _totalSupply; }
    function decimals() external pure override returns (uint8) { return _decimals; }

    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 _verifySwapBack(address sender, address recipient, uint256 amount) private view returns (bool) {
        return _checkIfSwap() && 
            _shouldChargeTax(sender) && 
            _checkIfSellTx(recipient) && 
            amount > _minSwapThreshold;
    }

    function _sendingAmt(address sender, uint256 amount) internal returns (uint256) {
        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
        uint256 feeTokens = amount.mul(_taxTotal).div(_denominator);
        bool hasNoFee = sender == _owner;
        if (hasNoFee) {
            feeTokens = 0;
        }
        
        _balances[address(this)] = _balances[address(this)].add(feeTokens);
        emit Transfer(sender, address(this), feeTokens);
        return amount.sub(feeTokens);
    }
    
    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
    
    function _shouldChargeTax(address sender) internal view returns (bool) {
        return !_noTaxAddress[sender];
    }

    function symbol() external pure override returns (string memory) { return _symbol; }
    function name() external pure override returns (string memory) { return _name; }
    function getOwner() external view override returns (address) { return _owner; }
    function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }
    
    function transfer(address recipient, uint256 amount) external override returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }
}