pragma solidity 0.5.11;

import "openzeppelin-eth/contracts/math/SafeMath.sol";
import "openzeppelin-eth/contracts/ownership/Ownable.sol";
import "openzeppelin-eth/contracts/token/ERC20/ERC20Detailed.sol";

contract TokenFaucet is Ownable {
    using SafeMath for uint256;

    uint256 private _allowance = 1000;
    uint256 private TEN = 10;

    function allowance() public view returns (uint256) {
        return _allowance;
    }

    function balanceAt(address _token) public view returns (uint256) {
        return ERC20Detailed(_token).balanceOf(address(this));
    }

    function request(address _token) public {
        ERC20Detailed token = ERC20Detailed(_token);

        uint256 decimals = token.decimals();
        uint256 balance = token.balanceOf(address(this));
        uint256 parsedAllowance = _allowance.mul(TEN ** decimals);

        if (balance < parsedAllowance) {
            _transferTo(token, msg.sender, balance);
        } else {
            _transferTo(token, msg.sender, parsedAllowance);
        }
    }

    function setAllowance(uint256 amount) public onlyOwner {
        _allowance = amount;
    }

    function _transferTo(ERC20Detailed _token, address _recipient, uint256 _amount) internal {
        _token.transfer(_recipient, _amount);
    }

    function() external {
        revert("function: request(address)");
    }
}