pragma solidity ^0.4.25;

import "@digix/lite-dgx-contract/contracts/DummyDGX.sol";

/// @title Digix Gold Token Demurrage Calculator
/// @author Digix Holdings Pte Ltd
/// @notice This contract is meant to be used by exchanges/other parties who want to calculate the DGX demurrage fees, provided an initial balance and the days elapsed
contract MockDgxDemurrageCalculator {
    address public TOKEN_ADDRESS;

    function token() internal view returns (DummyDGX _token) {
        _token = DummyDGX(TOKEN_ADDRESS);
    }

    constructor(address _token_address) public {
        TOKEN_ADDRESS = _token_address;
    }

    function calculateDemurrage(uint256 _initial_balance, uint256 _days_elapsed)
        public
        view
        returns (uint256 _demurrage_fees, bool _no_demurrage_fees)
    {
        uint256 _base;
        uint256 _rate;
        (_base, _rate,,_no_demurrage_fees) = token().showDemurrageConfigs();
        _demurrage_fees = (_initial_balance * _days_elapsed * _rate) / _base;
    }
}