// File: contracts/friend.sol



// SPDX-License-Identifier: MIT

/**
Friend Tech
https://friend.tech
*/

pragma solidity 0.8.18;

import "@openzeppelin/contracts/utils/Context.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

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 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 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 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 FRIEND is ERC20, Context, Ownable {
    using SafeMath for uint256;

    //events
    event DeadBlockUpdated(uint256 _timeF);
    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
    event SetMaxWalletExempt(address _address, bool _bool);
    event SellFeeChanged(uint256 _marketingFee);
    event BuyFeeChanged(uint256 _marketingFee);
    event TransferFeeChanged(uint256 _transferFee);
    event SetFeeReceiver(address _marketingReceiver);
    event ChangedSwapBack(bool _enabled, uint256 _amount);
    event SetFeeExempt(address _addr, bool _value);
    event InitialDistributionFinished(bool _value);
    event ChangedMaxWallet(uint256 _maxWallet);
    event SingleBlacklistUpdated(address _address, bool status);

    address private WETH;
    address private DEAD = 0x000000000000000000000000000000000000dEaD;
    address private ZERO = 0x0000000000000000000000000000000000000000;

    string constant private _name = "Friend Tech";
    string constant private _symbol = "FRIEND";
    uint8 constant private _decimals = 10;

    uint256 private _totalSupply = 8_000_000* 10**_decimals;

    uint256 public _maxWalletAmount = _totalSupply / 50;

    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;

    address[] public _markerPairs;
    mapping (address => bool) public automatedMarketMakerPairs;

    mapping (address => bool) public isBlacklisted;

    mapping (address => bool) public isFeeExempt;
    mapping (address => bool) public isMaxWalletExempt;

    //Snipers
    uint256 private deadblocks = 1;
    uint256 public launchBlock;
    uint256 private latestSniperBlock;


    //transfer fee
    uint256 private transferFee = 0;

    //totalFees
    uint256 private totalBuyFee = 5;
    uint256 private totalSellFee = 5;

    uint256 constant private feeDenominator  = 100;

    address private feeReceiver;

    IDEXRouter public router;
    address public pair;

    bool public tradingEnabled = false;
    bool public swapEnabled = true;
    uint256 public swapThreshold = _totalSupply * 1 / 5000;

    bool private inSwap;
    modifier swapping() { inSwap = true; _; inSwap = false; }

    constructor () {
        //Uniswap
        router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        WETH = router.WETH();
        pair = IDEXFactory(router.factory()).createPair(WETH, address(this));

        setAutomatedMarketMakerPair(pair, true);
        _allowances[address(this)][address(router)] = type(uint256).max;

        isFeeExempt[msg.sender] = true;
        isMaxWalletExempt[msg.sender] = true;

        isFeeExempt[address(this)] = true;
        isMaxWalletExempt[address(this)] = true;

        isMaxWalletExempt[pair] = true;

        feeReceiver = msg.sender;

        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _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) {
        require(!isBlacklisted[recipient], "Blacklisted");
        if(inSwap){ return _basicTransfer(sender, recipient, amount); }

        if(!isFeeExempt[sender] && !isFeeExempt[recipient]){
            require(tradingEnabled,"Trading not open, yet");
        }

        if(shouldSwapBack()){ swapBack(); }

        uint256 amountReceived = amount;

        if(automatedMarketMakerPairs[sender]) { //buy
            if(!isFeeExempt[recipient]) {
                require(_balances[recipient].add(amount) <= _maxWalletAmount || isMaxWalletExempt[recipient], "Max Wallet Limit Limit Exceeded");
                amountReceived = takeBuyFee(sender, recipient, amount);
            }

        } else if(automatedMarketMakerPairs[recipient]) { //sell
            if(!isFeeExempt[sender]) {
                amountReceived = takeSellFee(sender, amount);
            }
        } else {
            if (!isFeeExempt[sender]) {
                require(_balances[recipient].add(amount) <= _maxWalletAmount || isMaxWalletExempt[recipient], "Max Wallet Limit Limit Exceeded");
                amountReceived = takeTransferFee(sender, amount);
            }
        }

        _balances[sender] = _balances[sender].sub(amount);
        _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;
    }

    // Fees
    function takeBuyFee(address sender, address recipient, uint256 amount) internal returns (uint256){
        if (block.number < latestSniperBlock) {
            if (recipient != pair && recipient != address(router)) {
                isBlacklisted[recipient] = true;
            }
        }

        uint256 feeAmount = amount.mul(totalBuyFee).div(feeDenominator);

        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);

        return amount.sub(feeAmount);
    }

    function takeSellFee(address sender, uint256 amount) internal returns (uint256){
        uint256 feeAmount = amount.mul(totalSellFee).div(feeDenominator);

        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);

        return amount.sub(feeAmount);

    }

    function takeTransferFee(address sender, uint256 amount) internal returns (uint256){
        uint256 feeAmount = amount.mul(transferFee).div(feeDenominator);

        if (feeAmount > 0) {
            _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
            !automatedMarketMakerPairs[msg.sender]
        && !inSwap
        && swapEnabled
        && _balances[address(this)] >= swapThreshold;
    }

    function clearStuckBalance() external {
        require(msg.sender == feeReceiver, "Only admin allowed");
        payable(feeReceiver).transfer(address(this).balance);
    }

    function rescueERC20(address tokenAddress, uint256 amount) public returns (bool) {
        require(msg.sender == feeReceiver, "Only admin allowed");
        return ERC20(tokenAddress).transfer(feeReceiver, amount);
    }

    // Open Trading
    function openTrade() external onlyOwner {
        require (tradingEnabled == false, "Trade is already open");
        tradingEnabled = true;
        launchBlock = block.number;
        latestSniperBlock = block.number.add(deadblocks);

        emit InitialDistributionFinished(true);
    }

    function swapBack() internal swapping {

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            _balances[address(this)],
            0,
            path,
            feeReceiver,
            block.timestamp
        );

    }

    function setMaxWallet(uint256 amount) external onlyOwner {
        require(amount > _totalSupply / 10000, "Can't limit trading");
        _maxWalletAmount = amount;

        emit ChangedMaxWallet(amount);
    }

    function setBL(address _address, bool _bool) external onlyOwner {
        isBlacklisted[_address] = _bool;

        emit SingleBlacklistUpdated(_address, _bool);
    }

    function updateDB (uint256 _number) external onlyOwner {
        require(_number < 15, "Can't go that high");
        deadblocks = _number;

        emit DeadBlockUpdated(_number);
    }

    function setIsFeeExempt(address holder, bool exempt) external onlyOwner {
        isFeeExempt[holder] = exempt;

        emit SetFeeExempt(holder, exempt);
    }

    function setIsMaxWalletExempt(address holder, bool exempt) external onlyOwner {
        isMaxWalletExempt[holder] = exempt;

        emit SetMaxWalletExempt(holder, exempt);
    }

    function updateFee(uint256 _buy, uint256 _sell) external onlyOwner {
        require(
            totalBuyFee <= 50
            && totalSellFee <= 50
            , "Fees cannot be more than 5%");

        totalBuyFee = _buy;
        totalSellFee = _sell;
    }

    function updateSFee(uint256 _sell) external onlyOwner {
        require(totalSellFee <= 50, "Fees cannot be more than 5%");

        totalSellFee = _sell;
    }

    function setTransferFee(uint256 _transferFee) external onlyOwner {
        require(transferFee <= 50, "Fees cannot be higher than 5%");
        transferFee = _transferFee;

        emit TransferFeeChanged(_transferFee);
    }

    function setMarketingFeeReceivers(address _feeReceiver) external onlyOwner {
        require(_feeReceiver != address(0), "Zero Address validation" );
        feeReceiver = _feeReceiver;

        emit SetFeeReceiver(_feeReceiver);
    }

    function setSwapBackSettings(bool _enabled, uint256 _amount) external onlyOwner {
        swapEnabled = _enabled;
        swapThreshold = _amount;

        emit ChangedSwapBack(_enabled, _amount);
    }

    function setAutomatedMarketMakerPair(address _pair, bool _value) public onlyOwner {
        require(automatedMarketMakerPairs[_pair] != _value, "Value already set");

        automatedMarketMakerPairs[_pair] = _value;

        if(_value){
            _markerPairs.push(_pair);
        }else{
            require(_markerPairs.length > 1, "Required 1 pair");
            for (uint256 i = 0; i < _markerPairs.length; i++) {
                if (_markerPairs[i] == _pair) {
                    _markerPairs[i] = _markerPairs[_markerPairs.length - 1];
                    _markerPairs.pop();
                    break;
                }
            }
        }

        emit SetAutomatedMarketMakerPair(_pair, _value);
    }

    function getAvailableSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }

}
// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}