// SPDX-License-Identifier: MIT

pragma solidity ^0.8.17;

library SafeMath {
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address to, 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 from,
        address to,
        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 Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _transferOwnership(_msgSender());
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, 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 IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, 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 removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    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);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    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 FUBU is IERC20, Ownable {
    using SafeMath for uint256;

    // ERC20 variables

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    uint256 private _totalSupply;

    // FUBU variables

    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;

    bool private swapping;

    uint256 public numTokensSellDivisor;
    uint256 public maxTxAmount;
    uint256 public maxWalletAmount;

    mapping (address => bool) private isExcludedFromFees;
    mapping (address => bool) private isExcludedFromMaxWallet;

    // store addresses that are automatic market maker pairs. Any transfer *to* these addresses could be subject to a maximum transfer amount
    mapping (address => bool) public automatedMarketMakerPairs;

    uint256 public liquidityFeeBuy = 0;
    uint256 public liquidityFeeSell = 60;

    bool public liquidityActive = true;

    mapping(address => bool) public foundation;
    bool public foundationGuardActive = true;

    event addedLiquidity(uint256 tokenAmount, uint256 ethAmount);

    modifier onlyFoundation() {
        require(foundation[_msgSender()], "FUBU: Must be a foundation address");
        _;
    }

    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_,
        uint256 totalSupply_,
        address uniswapV2Router_
    ) payable {
        maxTxAmount = totalSupply_;
        maxWalletAmount = totalSupply_;

        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;

        // Total supply is taken care of by the _mint function

        if (uniswapV2Router_ != address(0)) {
            IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(uniswapV2Router_);
            
             // Create a uniswap pair for this new token
            address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
            
            uniswapV2Router = _uniswapV2Router;
            uniswapV2Pair = _uniswapV2Pair;

            automatedMarketMakerPairs[address(uniswapV2Pair)] = true;

            isExcludedFromMaxWallet[address(uniswapV2Pair)] = true;
            foundation[address(uniswapV2Pair)] = true;

            _approve(address(this), address(uniswapV2Router), totalSupply_);
            _approve(address(this), uniswapV2Pair, totalSupply_);
        }

        isExcludedFromFees[owner()] = true;
        isExcludedFromFees[address(this)] = true;

        isExcludedFromMaxWallet[owner()] = true;
        isExcludedFromMaxWallet[address(this)] = true;

        foundation[owner()] = true;
        foundation[address(this)] = true;

        numTokensSellDivisor = totalSupply_.div(100);

        /*
            _mint is an internal function in ERC20.sol that is only called here and CANNOT be called ever again
        */
        _mint(owner(), totalSupply_);
    }

    // must be here to receive ETH
    receive() external payable {
    }

    function name() public view virtual returns (string memory) {
        return _name;
    }

    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    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 _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");

        if (sender != owner() && recipient != owner()) {
            require(amount <= maxTxAmount, "FUBU: Transfer amount exceeds the maxTxAmount");

            if (foundationGuardActive) {
                require(foundation[sender] && foundation[recipient], "FUBU: Foundation Guard is active - both sender and recipient must be foundation addresses");
            }
        }

        if (!isExcludedFromMaxWallet[recipient]) {
            require((balanceOf(recipient) + amount) <= maxWalletAmount, "FUBU: Maximum wallet amount will be reached");
        }

        _beforeTokenTransfer(sender, recipient, amount);

        if (amount == 0) {
             _transferAmount(sender, recipient, 0);
            return;
        }

        if (liquidityActive) {      
            uint256 contractTokenBalance = balanceOf(address(this));
            uint256 swapTokensAtAmount = _totalSupply.div(numTokensSellDivisor);

            bool canSwap = contractTokenBalance >= swapTokensAtAmount;

            if (canSwap &&
                !swapping &&
                !automatedMarketMakerPairs[sender] &&
                sender != owner() &&
                recipient != owner()
            ) {
                swapping = true;

                if (contractTokenBalance > 0) {
                    swapAndLiquify(swapTokensAtAmount);
                }
                
                swapping = false;
            }
        }

        bool takeFee = !swapping;

        // if any account belongs to _isExcludedFromFee account then remove the fee
        if (isExcludedFromFees[sender] || isExcludedFromFees[recipient]) {
            takeFee = false;
        }

        uint256 _liquidityFee = 0;

        if (automatedMarketMakerPairs[sender]) {
            _liquidityFee = liquidityFeeBuy;
        }

        if (automatedMarketMakerPairs[recipient]) {
            _liquidityFee = liquidityFeeSell;
        }

        if (takeFee && (_liquidityFee > 0)) {
            uint256 fees = amount.mul(_liquidityFee).div(1000);

            amount = amount.sub(fees);

            _transferAmount(sender, address(this), fees);
        }
    
        _transferAmount(sender, recipient, amount);
    }

    function _transferAmount(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        _balances[sender] = _balances[sender].sub(
            amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);

        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(
            amount,
            "ERC20: burn amount exceeds balance"
        );
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        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 _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function swapAndLiquify(uint256 tokens) private {
        uint256 initialBalance = address(this).balance;
        uint256 halfTokens = tokens.div(2);

        swapTokensForEth(halfTokens);
        uint256 newBalance = address(this).balance.sub(initialBalance);
        
        addLiquidity(halfTokens, newBalance);        
    }

    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();

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp.add(30)
        );

    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        // add the liquidity
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            address(this),
            block.timestamp.add(300)
        );

        emit addedLiquidity(tokenAmount, ethAmount);
    }

    function getAmountOut(uint256 amountIn) private view returns(uint256) {
        address[] memory path;
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        uint256[] memory amountsOut = uniswapV2Router.getAmountsOut(amountIn, path);

        return amountsOut[1];
    }

    function setFees(uint256 liquidityFeeBuy_, uint256 liquidityFeeSell_) external onlyOwner {
        liquidityFeeBuy = liquidityFeeBuy_;
        liquidityFeeSell = liquidityFeeSell_;
    }

    function excludeFromFees(address account) public onlyOwner {
        isExcludedFromFees[account] = true;
    }
    
    function includeInFees(address account) public onlyOwner {
        isExcludedFromFees[account] = false;
    }

    function setRouterAddress(address newRouter) public onlyOwner() {
        IUniswapV2Router02 _newRouter = IUniswapV2Router02(newRouter);
        uniswapV2Pair = IUniswapV2Factory(_newRouter.factory()).createPair(address(this), _newRouter.WETH());
        uniswapV2Router = _newRouter;

        _approve(address(this), address(uniswapV2Router), _totalSupply);
        _approve(address(this), uniswapV2Pair, _totalSupply);

        automatedMarketMakerPairs[address(uniswapV2Pair)] = true;
    }

    function rescueToken(address token, address to) external onlyOwner {
        IERC20(token).transfer(to, IERC20(token).balanceOf(address(this)));
    }

    function setFoundationStatus(address address_, bool status_) external onlyOwner {
        foundation[address_] = status_;
    }

    function isFoundation(address address_) external view returns(bool) {
        return foundation[address_];
    }

    function setMaxTxAmount(uint256 maxTxAmount_) external onlyOwner {
        maxTxAmount = maxTxAmount_;
    }

    function setMaxWalletAmount(uint256 maxWalletAmount_) external onlyOwner {
        maxWalletAmount = maxWalletAmount_;
    }

    function setNumTokensSellDivisor(uint256 numTokensSellDivisor_) external onlyOwner {
        numTokensSellDivisor = numTokensSellDivisor_;
    }

    function setAutomatedMarketMakerPairs(address address_, bool status_) external onlyOwner {
        automatedMarketMakerPairs[address_] = status_;
    }

    function disableFoundationGuard() external onlyOwner {
        foundationGuardActive = false;
    }

   function setLiquidityActive(bool status_) external onlyOwner {
        liquidityActive = status_;
    }

    function burnTokens(uint256 tokenAmount_) external onlyFoundation {
        _burn(_msgSender(), tokenAmount_);
    }
}