contract liquidbotToken is ERC20Interface, Owned, SafeMath {
    string public symbol;
    string public name;
    uint8 public decimals;
    uint256 public _totalSupply;
    uint256 public startDate;
    uint256 public endDate;
    bool public airdropTokensWithdrawn = false;

    mapping(address => uint256) balances;
    mapping(address => mapping(address => uint256)) allowed;

    // ------------------------------------------------------------------------
    // Constructor
    // ------------------------------------------------------------------------
    constructor() {
        symbol = "LQB";
        name = "Liquidbot Token";
        decimals = 18;
        startDate = block.timestamp + 20 weeks;
    }

    // ------------------------------------------------------------------------
    // Total supply
    // ------------------------------------------------------------------------
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    // ------------------------------------------------------------------------
    // Get the token balance for account `tokenOwner`
    // ------------------------------------------------------------------------
    function balanceOf(address tokenOwner)
        public
        override
        view
        returns (uint256 balance)
    {
        return balances[tokenOwner];
    }

    // ------------------------------------------------------------------------
    // Transfer the balance from token owner's account to `to` account
    // - Owner's account must have sufficient balance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transfer(address to, uint256 tokens)
        public
        override
        returns (bool success)
    {
        balances[msg.sender] = safeSub(balances[msg.sender], tokens);
        balances[to] = safeAdd(balances[to], tokens);
        emit Transfer(msg.sender, to, tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account
    //
    // https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
    // recommends that there are no checks for the approval double-spend attack
    // as this should be implemented in user interfaces
    // ------------------------------------------------------------------------
    function approve(address spender, uint256 tokens)
        public
        override
        returns (bool success)
    {
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Transfer `tokens` from the `from` account to the `to` account
    //
    // The calling account must already have sufficient tokens approve(...)-d
    // for spending from the `from` account and
    // - From account must have sufficient balance to transfer
    // - Spender must have sufficient allowance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transferFrom(
        address from,
        address to,
        uint256 tokens
    ) public override returns (bool success) {
        balances[from] = safeSub(balances[from], tokens);
        allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens);
        balances[to] = safeAdd(balances[to], tokens);
        emit Transfer(from, to, tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Returns the amount of tokens approved by the owner that can be
    // transferred to the spender's account
    // ------------------------------------------------------------------------
    function allowance(address tokenOwner, address spender)
        public
        override
        view
        returns (uint256 remaining)
    {
        return allowed[tokenOwner][spender];
    }

    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account. The `spender` contract function
    // `receiveApproval(...)` is then executed
    // ------------------------------------------------------------------------
    function approveAndCall(
        address spender,
        uint256 tokens,
        bytes memory data
    ) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(
            msg.sender,
            tokens,
            address(0),
            data
        );
        return true;
    }

    // ------------------------------------------------------------------------
    // handles contributions
    // ------------------------------------------------------------------------
    receive() external payable {
        require(block.timestamp >= startDate && block.timestamp <= endDate);
        uint256 tokens = safeMul(msg.value, 40);
        balances[msg.sender] = safeAdd(balances[msg.sender], tokens);
        _totalSupply = safeAdd(_totalSupply, tokens);
        emit Transfer(address(0), msg.sender, tokens);
    }

    // ------------------------------------------------------------------------
    // Owner only start Crowdsale
    // ------------------------------------------------------------------------
    function startCrowdsale() public onlyOwner {
        startDate = block.timestamp;
        endDate = block.timestamp + 6 weeks;
    }

    // ------------------------------------------------------------------------
    // Send tokens to owner for airdrop
    // ------------------------------------------------------------------------
    function getAirdropTokens() public onlyOwner {
        require(block.timestamp >= startDate && block.timestamp <= endDate);
        require(!airdropTokensWithdrawn);
        uint256 tokens = 5000000000000000000000;
        balances[owner] = safeAdd(balances[owner], tokens);
        _totalSupply = safeAdd(_totalSupply, tokens);
        emit Transfer(address(0), owner, tokens);
        airdropTokensWithdrawn = true;
    }

    // ------------------------------------------------------------------------
    // Owner only withdraw ETH
    // ------------------------------------------------------------------------
    function withDrawETH(uint256 amount) public onlyOwner tokensaleEnded {
        owner.transfer(amount);
    }

    // ------------------------------------------------------------------------
    // Owner only withdraw ETH to address
    // ------------------------------------------------------------------------
    function withDrawETHToAddress(address payable destinationAddress, uint256 amount) public onlyOwner tokensaleEnded {
        destinationAddress.transfer(amount);
    }

    // ------------------------------------------------------------------------
    // Owner can transfer out any accidentally sent ERC20 tokens
    // ------------------------------------------------------------------------
    function transferAnyERC20Token(address tokenAddress, uint256 tokens)
        public
        onlyOwner
        returns (bool success)
    {
        return ERC20Interface(tokenAddress).transfer(owner, tokens);
    }

    function _approve(
        address owner,
        address spender,
        uint256 value
    ) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        allowed[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    modifier tokensaleEnded {
        require(block.timestamp > endDate);
        _;
    }
}
// ----------------------------------------------------------------------------
// ERC20 Token, with the addition of symbol, name and decimals and assisted
// token transfers
// ----------------------------------------------------------------------------
function balanceOf(address tokenOwner)
    public
    override
    view
    returns (uint256 balance)
{
    return balances[tokenOwner];
}

// ------------------------------------------------------------------------
// Get the token balance for account `tokenOwner`
// ------------------------------------------------------------------------