/*
    RabbitDao 
    You must be referred (humped) to buy!
    Refer other wallets and get rewards for their every buy

    Year of the Rabbit is here and rabbits are known for their fast reproduction! 

    Telegram: https://t.me/RabbitDaoERC
    dApp: https://RabbitDao.app
*/
 
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.5;

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) {
        // Solidity only automatically asserts when dividing by 0
        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;
    }
}

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);
}

abstract contract Auth {
    address internal owner;
    mapping (address => bool) internal authorizations;

    constructor(address _owner) {
        owner = _owner;
        authorizations[_owner] = true;
    }

    modifier onlyOwner() {
        require(isOwner(msg.sender), "!OWNER"); _;
    }

    modifier authorized() {
        require(isAuthorized(msg.sender), "!AUTHORIZED"); _;
    }

    function authorize(address adr) public onlyOwner {
        authorizations[adr] = true;
    }

    function unauthorize(address adr) public onlyOwner {
        authorizations[adr] = false;
    }

    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }

    function isAuthorized(address adr) public view returns (bool) {
        return authorizations[adr];
    }

    function transferOwnership(address payable adr) public onlyOwner {
        owner = adr;
        authorizations[adr] = true;
        emit OwnershipTransferred(adr);
    }

    event OwnershipTransferred(address owner);
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

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 RabbitDao is IERC20, Auth {
    using SafeMath for uint256;

    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    string constant _name = "RabbitDAO";
    string constant _symbol = "RDAO";
    uint8 constant _decimals = 9;

    uint256 _totalSupply = 100000000 * (10 ** _decimals);
    uint256 public _maxWalletSize = (_totalSupply * 2) / 100; 
    uint256 public _minTransferForReferral = 1 * (10 ** _decimals); 

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) _allowances;
    
    mapping (address => bool) isFeeExempt;
    mapping (address => address) public referrer; 
    mapping(address => bool) public isReferred;

    uint256 liquidityFee = 2;
    uint256 devFee = 0;
    uint256 marketingFee = 23;

    uint256 totalFee = 25;
    uint256 feeDenominator = 100;

    uint256 referralFee = 2;

    uint256 public minSupplyForReferralReward = (_totalSupply * 1) / 1000;
    
    address private marketingFeeReceiver = 0xDfBE0966101EB7F670338b33238F7B6c6bB28785;
    address private devFeeReceiver = 0xDfBE0966101EB7F670338b33238F7B6c6bB28785;

    IUniswapV2Router public router;
    address public pair;

    bool public swapEnabled = true;
    uint256 public swapThreshold = _totalSupply / 1000 * 3; // 0.3%

    bool inSwap;
    modifier swapping() { inSwap = true; _; inSwap = false; }

    event ReferralBonus(address indexed feesTo , address indexed feesFrom , uint value);
    event Referred(address indexed referred,address indexed referrer);

    constructor () Auth(msg.sender) {
        router = IUniswapV2Router(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); //Router address
        pair = IUniswapV2Factory(router.factory()).createPair(router.WETH(), address(this));
        _allowances[address(this)][address(router)] = type(uint256).max;

        address _owner = owner;
        isFeeExempt[_owner] = true;
        isFeeExempt[pair] = true;
        isFeeExempt[address(router)] = true;

        isReferred[_owner] = true;
        
        _balances[_owner] = _totalSupply;
        emit Transfer(address(0), _owner, _totalSupply);
    }

    receive() external payable { }

    function totalSupply() external view override returns (uint256) { return _totalSupply; }
    function decimals() external pure override returns (uint8) { return _decimals; }
    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 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 _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        if(inSwap){ return _basicTransfer(sender, recipient, amount); }    

        if (recipient != pair && recipient != DEAD) {
            require(isFeeExempt[recipient] || _balances[recipient] + amount <= _maxWalletSize, "Transfer amount exceeds the bag size.");
        }

        uint256 amountReceived = amount; 
        
        if(sender == pair) { //buy
            if(!isFeeExempt[recipient]) {
                require(isReferred[recipient],"Not referred");
                amountReceived = takeReferralFees(recipient,amount);
            }

        } else if(recipient == pair) { //sell
            if(shouldTakeFee(sender)) {
                amountReceived = takeFee(sender, amount);
            }  

        } else if(isReferred[recipient]==false) {
            if(amount >= _minTransferForReferral) {
                isReferred[recipient] = true;
                referrer[recipient] = sender;
                emit Referred(recipient,sender);
            }
        } 
        
        if(shouldSwapBack()){ swapBack(); }

        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
        _balances[recipient] = _balances[recipient].add(amountReceived);

        emit Transfer(sender, recipient, amountReceived);
        return true;
    }
    
    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 takeReferralFees(address from,uint256 amount) internal returns(uint) {
        uint256 referralTokens = referralFee * amount / feeDenominator;
        if(_balances[referrer[from]] > minSupplyForReferralReward) {
            _balances[referrer[from]] = _balances[referrer[from]].add(referralTokens);
            emit ReferralBonus(referrer[from],from,referralTokens);
        } else {
             _balances[marketingFeeReceiver] = _balances[marketingFeeReceiver].add(referralTokens);
            emit ReferralBonus(marketingFeeReceiver,from,referralTokens);
        }

        return amount - referralTokens;
    }
    
    function shouldTakeFee(address sender) internal view returns (bool) {
        return !isFeeExempt[sender];
    }

    function takeFee(address sender, uint256 amount) internal returns (uint256) {
        uint256 feeAmount = amount.mul(totalFee).div(feeDenominator);

        _balances[address(this)] = _balances[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
        && _balances[address(this)] >= swapThreshold;
    }

    function swapBack() internal swapping {
        uint256 contractTokenBalance = balanceOf(address(this));
        uint256 amountToLiquify = contractTokenBalance.mul(liquidityFee).div(totalFee).div(2);
        uint256 amountToSwap = contractTokenBalance.sub(amountToLiquify);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        uint256 balanceBefore = address(this).balance;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );
        uint256 amountETH = address(this).balance.sub(balanceBefore);
        uint256 totalETHFee = totalFee.sub(liquidityFee.div(2));
        uint256 amountETHLiquidity = amountETH.mul(liquidityFee).div(totalETHFee).div(2);
        uint256 amountETHDev = amountETH.mul(devFee).div(totalETHFee);
        uint256 amountETHMarketing = amountETH - amountETHLiquidity - amountETHDev;

        (bool MarketingSuccess, /* bytes memory data */) = payable(marketingFeeReceiver).call{value: amountETHMarketing, gas: 30000}("");
        require(MarketingSuccess, "receiver rejected ETH transfer");
        (bool DevSuccess, /* bytes memory data */) = payable(devFeeReceiver).call{value: amountETHDev, gas: 30000}("");
        require(DevSuccess, "receiver rejected ETH transfer");
        addLiquidity(amountToLiquify, amountETHLiquidity);
    }

    function addLiquidity(uint256 tokenAmount, uint256 ETHAmount) private {
        if(tokenAmount > 0){
                router.addLiquidityETH{value: ETHAmount}(
                    address(this),
                    tokenAmount,
                    0,
                    0,
                    address(this),
                    block.timestamp
                );
                emit AutoLiquify(ETHAmount, tokenAmount);
            }
    }

    function setMaxWallet(uint256 amount) external onlyOwner() {
        require(amount >= _totalSupply / 1000 );
        _maxWalletSize = amount;
    }   

    function setMinimumBalanceForReferral(uint256 amount) external onlyOwner {
        minSupplyForReferralReward = amount;
    } 

    function setMinTransferForReferral(uint256 amount) external onlyOwner() {
        require(amount <= 1*(10**_decimals) );
        _minTransferForReferral = amount; 
    }

    function setIsFeeExempt(address holder, bool exempt) external authorized {
        isFeeExempt[holder] = exempt;
    }

    function setReferralFee(uint256 newFee) external authorized {
        referralFee = newFee;
    }

    function setFees(uint256 _liquidityFee, uint256 _devFee, uint256 _marketingFee, uint256 _feeDenominator) external authorized {
        liquidityFee = _liquidityFee;
        devFee = _devFee;
        marketingFee = _marketingFee;
        totalFee = _liquidityFee.add(_devFee).add(_marketingFee);
        feeDenominator = _feeDenominator;
    }

    function setFeeReceiver(address _marketingFeeReceiver, address _devFeeReceiver) external authorized {
        marketingFeeReceiver = _marketingFeeReceiver;
        devFeeReceiver = _devFeeReceiver;
    }

    function setSwapBackSettings(bool _enabled, uint256 _amount) external authorized {
        swapEnabled = _enabled;
        swapThreshold = _amount;
    }

    function manualSend() external authorized {
        uint256 contractETHBalance = address(this).balance;
        payable(marketingFeeReceiver).transfer(contractETHBalance);
    }

    function transferForeignToken(address _token) public authorized {
        require(_token != address(this), "Can't let you take all native token");
        uint256 _contractBalance = IERC20(_token).balanceOf(address(this));
        payable(marketingFeeReceiver).transfer(_contractBalance);
    }
        
    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }

    function getLiquidityBacking(uint256 accuracy) public view returns (uint256) {
        return accuracy.mul(balanceOf(pair).mul(2)).div(getCirculatingSupply());
    }

    function isOverLiquified(uint256 target, uint256 accuracy) public view returns (bool) {
        return getLiquidityBacking(accuracy) > target;
    }
    
    event AutoLiquify(uint256 amountETH, uint256 amountBOG);
}