pragma solidity ^0.5.0;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "./Ktoken.sol";

contract KErc20 is KToken {
    using SafeMath for uint256;

    constructor (address tokenAddress, address invokerAddress, string memory name, string memory symbol, uint8 decimals)
    public
    KToken(tokenAddress, invokerAddress, name, symbol, decimals)
    { }

    function mint(uint256 tokenAmount)
    external
    returns (bool)
    {
        IERC20 token = IERC20(_tokenAddress);
        require(token.transferFrom(msg.sender, address(this), tokenAmount), "KErc20: token transferFrom failed");
        return mintInternal(tokenAmount);
    }

    function isKEther() public view returns (bool) {
        return false;
    }

    function totalReserve()
    public
    view
    returns (uint256)
    {
        return IERC20(_tokenAddress).balanceOf(address(this));
    }

    function transferUnderlyingInternal(address to, uint256 amount)
    internal
    returns (bool)
    {
        return IERC20(_tokenAddress).transfer(to, amount);
    }
}