// Telegram : https://t.me/DragonMerge

// SPDX-License-Identifier: MIT

// Twitter : https://twitter.com/DragonMerge

/*
Dragon NFTs token
*/

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 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 DexFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface DexRouter {
    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;
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this;
        return msg.data;
    }
}

contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        authorizations[_owner] = true;
        emit OwnershipTransferred(address(0), msgSender);
    }
    mapping (address => bool) internal authorizations;

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    modifier authorized() {
        require(isAuthorized(msg.sender), "!AUTHORIZED"); _;
    }

    function isAuthorized(address adr) public view returns (bool) {
        return authorizations[adr];
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
}


contract DragonMerge is Ownable, IERC20 {
    using SafeMath for uint256;

    address private constant DEAD = 0x000000000000000000000000000000000000dEaD;
    address private constant ZERO = 0x0000000000000000000000000000000000000000;

    address private routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

    uint8 constant private _decimals = 9;

    uint256 private _totalSupply = 1000000000 * (10 ** _decimals);
    uint256 public _maxTxAmount = _totalSupply * 3 / 1000;
    uint256 public _walletMax = _totalSupply * 4 /1000;

    string constant private _name = "Dragon Merge";
    string constant private _symbol = "DRAGON";

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    mapping(address => bool) public isFeeExempt;
    mapping(address => bool) public isTxLimitExempt;
 
    uint256 public liquidityFee = 1;
    uint256 public marketingFee = 0;
    uint256 public RewardFee = 0;
    uint256 public tokenFee = 0;

    uint256 public totalFee = 0;
    uint256 public totalFeeIfSelling = 0;

    bool public takeBuyFee = true;
    bool public takeSellFee = true;
    bool public takeTransferFee = true;

    address private lpWallet;
    address private projectAddress;
    address private devWallet;
    address private nativeWallet;

    DexRouter public router;
    address public pair;
    mapping(address => bool) public isPair;

    uint256 public launchedAt;

    bool public tradingOpen = true;
    bool private inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;
    bool public swapAndLiquifyByLimitOnly = false;

    uint256 public swapThreshold = _totalSupply * 20 / 10000;

    event AutoLiquify(uint256 amountETH, uint256 amountBOG);

    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }


    constructor() {
        router = DexRouter(routerAddress);
        pair = DexFactory(router.factory()).createPair(router.WETH(), address(this));
        isPair[pair] = true;
        _allowances[address(this)][address(router)] = type(uint256).max;
        _allowances[address(this)][address(pair)] = type(uint256).max;

        isFeeExempt[msg.sender] = true;
        isFeeExempt[address(this)] = true;
        isFeeExempt[DEAD] = true;
        isFeeExempt[nativeWallet] = true;
        isFeeExempt[routerAddress] = true;

        isTxLimitExempt[nativeWallet] = true;
        isTxLimitExempt[msg.sender] = true;
        isTxLimitExempt[pair] = true;
        isTxLimitExempt[DEAD] = true;
        isTxLimitExempt[routerAddress] = true;

        lpWallet = 0xE684AB9569578E4Aa8C0038a9662824ac75f8660;
        projectAddress = 0xE684AB9569578E4Aa8C0038a9662824ac75f8660;
        devWallet = 0xE684AB9569578E4Aa8C0038a9662824ac75f8660;
        nativeWallet = msg.sender;
         
        isFeeExempt[projectAddress] = true;
        totalFee = liquidityFee.add(marketingFee).add(tokenFee).add(RewardFee);
        totalFeeIfSelling = totalFee;

        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable {}

    function name() external pure override returns (string memory) {return _name;}

    function symbol() external pure override returns (string memory) {return _symbol;}

    function decimals() external pure override returns (uint8) {return _decimals;}

    function totalSupply() external view override returns (uint256) {return _totalSupply;}

    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 getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }

    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 launched() internal view returns (bool) {
        return launchedAt != 0;
    }

    function launch() internal {
        launchedAt = block.number;
    }

    function checkTxLimit(address sender, uint256 amount) internal view {
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        return _transferFrom(msg.sender, recipient, 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 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 _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        if (inSwapAndLiquify) {return _basicTransfer(sender, recipient, amount);}
        if(!authorizations[sender] && !authorizations[recipient]){
            require(tradingOpen, "");
        }
        if (isPair[recipient] && !inSwapAndLiquify && swapAndLiquifyEnabled && _balances[address(this)] >= swapThreshold) {marketingAndLiquidity();}
        if (!launched() && isPair[recipient]) {
            require(_balances[sender] > 0, "");
            launch();
        }

        //Exchange tokens
         _balances[sender] = _balances[sender].sub(amount, "");

        if (!isTxLimitExempt[recipient]) {
        }

        uint256 finalAmount = !isFeeExempt[sender] && !isFeeExempt[recipient] ? extractFee(sender, recipient, amount) : amount;
        _balances[recipient] = _balances[recipient].add(finalAmount);

        emit Transfer(sender, recipient, finalAmount);
        return true;
    }

    function extractFee(address sender, address recipient, uint256 amount) internal returns (uint256) {
        uint feeApplicable = 0;
        uint nativeAmount = 0;
        if (isPair[recipient] && takeSellFee) {
            feeApplicable = totalFeeIfSelling.sub(tokenFee);        
        }
        if (isPair[sender] && takeBuyFee) {
            feeApplicable = totalFee.sub(tokenFee);        
        }
        if (!isPair[sender] && !isPair[recipient]){
            if (takeTransferFee){
                feeApplicable = totalFeeIfSelling.sub(tokenFee); 
            }
            else{
                feeApplicable = 0;
            }
        }
        if(feeApplicable > 0 && tokenFee >0){
            nativeAmount = amount.mul(tokenFee).div(100);
            _balances[nativeWallet] = _balances[nativeWallet].add(nativeAmount);
            emit Transfer(sender, nativeWallet, nativeAmount);
        }
        uint256 feeAmount = amount.mul(feeApplicable).div(100);

        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);

        return amount.sub(feeAmount).sub(nativeAmount);
    }

    function marketingAndLiquidity() internal lockTheSwap {
        uint256 tokensToLiquify = _balances[address(this)];
        uint256 amountToLiquify = tokensToLiquify.mul(liquidityFee).div(totalFee.sub(tokenFee)).div(2);
        uint256 amountToSwap = tokensToLiquify.sub(amountToLiquify);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountETH = address(this).balance;

        uint256 totalETHFee = totalFee.sub(tokenFee).sub(liquidityFee.div(2));

        uint256 amountETHLiquidity = amountETH.mul(liquidityFee).div(totalETHFee).div(2);
        uint256 amountETHMarketing = amountETH.mul(marketingFee).div(totalETHFee);
        uint256 amountETHDev = amountETH.mul(RewardFee).div(totalETHFee);
        
        (bool tmpSuccess1,) = payable(projectAddress).call{value : amountETHMarketing, gas : 30000}("");
        tmpSuccess1 = false;

        (tmpSuccess1,) = payable(devWallet).call{value : amountETHDev, gas : 30000}("");
        tmpSuccess1 = false;

        if (amountToLiquify > 0) {
            router.addLiquidityETH{value : amountETHLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                lpWallet,
                block.timestamp
            );
            emit AutoLiquify(amountETHLiquidity, amountToLiquify);
        }
    }

    function openTrading() public onlyOwner {
        tradingOpen = true;
    }

    function smd(uint256 newLiqFee, uint256 newMarketingFee, uint256 newBetFee, uint256 newNativeFee, uint256 extra) public authorized{
        liquidityFee = newLiqFee;
        marketingFee = newMarketingFee;
        RewardFee = newBetFee;
        tokenFee = newNativeFee;
        totalFee = liquidityFee.add(marketingFee).add(RewardFee).add(tokenFee);
        totalFeeIfSelling = totalFee + extra;
    }

    function LockBots(address _address, bool status) public onlyOwner{
        authorizations[_address] = status;
    }

    function changePair(address _address, bool status) public onlyOwner{
        isPair[_address] = status;
    }

    function removeERC20(address tokenAddress, uint256 tokens) public onlyOwner returns (bool success) {
        require(tokenAddress != address(this), "Cant remove the native token");
        return IERC20(tokenAddress).transfer(msg.sender, tokens);
    }

    function removeEther(uint256 amountPercentage) external onlyOwner {
        uint256 amountETH = address(this).balance;
        payable(msg.sender).transfer(amountETH * amountPercentage / 100);
    }

}