// SPDX-License-Identifier: UNLICENSED

/*

TG: https://t.me/SilverSurferERC
Twitter : https://twitter.com/SilverSurferErc
Web: https://silversurfertoken.com/

Meet Silver Surfer, the crypto hero with a heart of silver and a passion for the metaverse! With his trusty surfboard and an uncanny ability to sniff out scams, he rides the waves of blockchain, swooping in to save virtual worlds from financial doom. Get ready for a hilarious and epic crypto crusade with Silver Surfer!

*/

pragma solidity 0.8.17;

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;
    }
}

interface ERC20 {
    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);
}

abstract contract Auth {
    address internal owner;

    constructor(address _owner) {
        owner = _owner;
    }

    modifier onlyOwner() {
        require(isOwner(msg.sender), "!OWNER"); _;
    }

    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }

    function renounceOwnership() external onlyOwner {
        owner = address(0);
    }

}

interface IDEXFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract SilverSurferToken is ERC20, Auth {
    using SafeMath for uint256;

    address immutable WETH;
    address constant DEAD = 0x000000000000000000000000000000000000dEaD;
    address constant ZERO = 0x0000000000000000000000000000000000000000;

    string public constant name = "Silver Surfer";
    string public constant symbol = "$SURFER";
    uint8 public constant decimals = 18;

    uint256 public constant totalSupply = 1 * 10**9 * 10**decimals;

    uint256 public _maxTxAmount = totalSupply / 100;
    uint256 public _maxWalletToken = totalSupply / 100;

    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) _allowances;

    mapping (address => bool) public isFeeExempt;
    mapping (address => bool) public isTxLimitExempt;
    mapping (address => bool) public isWalletLimitExempt;

    uint256 public marketingFee = 5;
    uint256 public operationsFee = 5;
    uint256 public totalFee = marketingFee + operationsFee;
    uint256 public constant feeDenominator = 100;
    
    uint256 buyMultiplier = 200;
    uint256 sellMultiplier = 250;
    uint256 transferMultiplier = 0;

    address marketingFeeReceiver;
    address operationsFeeReceiver;

    IDEXRouter public router;
    address public immutable pair;

    bool swapEnabled = true;
    uint256 swapThreshold = totalSupply / 200;
    bool inSwap;
    modifier swapping() { inSwap = true; _; inSwap = false; }

    constructor () Auth(msg.sender) {
        router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        WETH = router.WETH();

        pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
        _allowances[address(this)][address(router)] = type(uint256).max;

        marketingFeeReceiver = msg.sender;
        operationsFeeReceiver = msg.sender;

        isFeeExempt[msg.sender] = true;

        isTxLimitExempt[msg.sender] = true;
        isTxLimitExempt[DEAD] = true;
        isTxLimitExempt[ZERO] = true;

        isWalletLimitExempt[msg.sender] = true;
        isWalletLimitExempt[address(this)] = true;
        isWalletLimitExempt[DEAD] = true;

        balanceOf[msg.sender] = totalSupply;
        emit Transfer(address(0), msg.sender, totalSupply);
    }

    receive() external payable { }

    function getOwner() external view override returns (address) { return owner; }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, type(uint256).max);
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }

    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 setMaxWalletPercent_base1000(uint256 maxWallPercent_base1000) external onlyOwner {
        require(maxWallPercent_base1000 >= 5,"Cannot set max wallet less than 0.5%");
        _maxWalletToken = (totalSupply * maxWallPercent_base1000 ) / 1000;
    }

    function setMaxTxPercent_base1000(uint256 maxTXPercentage_base1000) external onlyOwner {
        require(maxTXPercentage_base1000 >= 5,"Cannot set max transaction less than 0.5%");
        _maxTxAmount = (totalSupply * maxTXPercentage_base1000 ) / 1000;
    }

    function manage_FeeExempt(address[] calldata addresses, bool status) external onlyOwner {
        require(addresses.length < 501,"GAS Error: max limit is 500 addresses");
        for (uint256 i=0; i < addresses.length; ++i) {
            isFeeExempt[addresses[i]] = status;
        }
    }

    function manage_TxLimitExempt(address[] calldata addresses, bool status) external onlyOwner {
        require(addresses.length < 501,"GAS Error: max limit is 500 addresses");
        for (uint256 i=0; i < addresses.length; ++i) {
            isTxLimitExempt[addresses[i]] = status;
        }
    }

    function manage_WalletLimitExempt(address[] calldata addresses, bool status) external onlyOwner {
        require(addresses.length < 501,"GAS Error: max limit is 500 addresses");
        for (uint256 i=0; i < addresses.length; ++i) {
            isWalletLimitExempt[addresses[i]] = status;
        }
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        if(inSwap){ return _basicTransfer(sender, recipient, amount); }

        if (!isWalletLimitExempt[sender] && !isWalletLimitExempt[recipient] && recipient != pair) {
            require((balanceOf[recipient] + amount) <= _maxWalletToken,"max wallet limit reached");
        }
    
        require((amount <= _maxTxAmount) || isTxLimitExempt[sender] || isTxLimitExempt[recipient], "Max TX Limit Exceeded");

        if(shouldSwapBack()){ swapBack(); }

        balanceOf[sender] = balanceOf[sender].sub(amount, "Insufficient Balance");

        uint256 amountReceived = (isFeeExempt[sender] || isFeeExempt[recipient]) ? amount : takeFee(sender, amount, recipient);

        balanceOf[recipient] = balanceOf[recipient].add(amountReceived);

        emit Transfer(sender, recipient, amountReceived);
        return true;
    }
    
    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        balanceOf[sender] = balanceOf[sender].sub(amount, "Insufficient Balance");
        balanceOf[recipient] = balanceOf[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function takeFee(address sender, uint256 amount, address recipient) internal returns (uint256) {
        if(amount == 0 || totalFee == 0){
            return amount;
        }

        uint256 multiplier = transferMultiplier;

        if(recipient == pair) {
            multiplier = sellMultiplier;
        } else if(sender == pair) {
            multiplier = buyMultiplier;
        }

        uint256 feeAmount = amount.mul(totalFee).mul(multiplier).div(feeDenominator * 100);

        if(feeAmount > 0){
            balanceOf[address(this)] = balanceOf[address(this)].add(feeAmount);
            emit Transfer(sender, address(this), feeAmount);
        }

        return amount.sub(feeAmount);
    }

    function shouldSwapBack() internal view returns (bool) {
        return msg.sender != pair
        && !inSwap
        && swapEnabled
        && balanceOf[address(this)] >= swapThreshold;
    }

    function clearStuckBalance(uint256 amountPercentage) external onlyOwner {
        uint256 amountETH = address(this).balance;
        uint256 amountToClear = ( amountETH * amountPercentage ) / 100;
        payable(msg.sender).transfer(amountToClear);
    }

    function clearStuckToken(address tokenAddress, uint256 tokens) external onlyOwner returns (bool success) {
        if(tokens == 0){
            tokens = ERC20(tokenAddress).balanceOf(address(this));
        }
        return ERC20(tokenAddress).transfer(msg.sender, tokens);
    }

    function swapBack() internal swapping {

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            swapThreshold,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountETH = address(this).balance;

        uint256 amountETHmarketing = (amountETH * marketingFee) / totalFee;
        uint256 amountETHOperations = (amountETH * operationsFee) / totalFee;

        (bool tmpSuccess,) = payable(marketingFeeReceiver).call{value: amountETHmarketing}("");
        (tmpSuccess,) = payable(operationsFeeReceiver).call{value: amountETHOperations}("");
    }

    function setMultipliers(uint256 _buy, uint256 _sell, uint256 _trans) external onlyOwner {
        sellMultiplier = _sell;
        buyMultiplier = _buy;
        transferMultiplier = _trans;
    }

    function setFees_base100(uint256 _marketingFee, uint256 _operationsFee) external onlyOwner {
        marketingFee = _marketingFee;
        operationsFee = _operationsFee;
        totalFee = _marketingFee + _operationsFee;
    }

    function setFeeReceivers(address _marketingFeeReceiver, address _operationsFeeReceiver) external onlyOwner {
        marketingFeeReceiver = _marketingFeeReceiver;
        operationsFeeReceiver = _operationsFeeReceiver;
    }

    function setSwapBackSettings(bool _enabled, uint256 _denominator) external onlyOwner {
        swapEnabled = _enabled;
        swapThreshold = totalSupply / _denominator;
    }

    function getCirculatingSupply() public view returns (uint256) {
        return (totalSupply - balanceOf[DEAD] - balanceOf[ZERO]);
    }
}