pragma solidity ^0.5.0;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/ownership/Ownable.sol";
import "@openzeppelin/contracts/lifecycle/Pausable.sol";

contract IInvoker {

    event Invocation(address invokeAddress, bytes32 invokeDataHash, address kTokenAddress, uint256 tokenAmount);
    event Reward(uint256 poolReward, uint256 platformReward, address tokenAddress);

    function invoke(address invokeAddress, bytes calldata invokeData, address kTokenAddress, uint256 tokenAmount)
    external
    payable;

    function calculatePoolReward(uint256 tokenAmount) internal view returns (uint256);

    function calculatePlatformReward(uint256 tokenAmount) internal view returns (uint256);

    function calculateExpectedBalance(uint256 startingBalance, uint256 tokenAmount) internal view returns (uint256);

    function poolReward() external view returns (uint256);

    function platformReward() external view returns (uint256);

    /* Helper hook for invoked transaction */

    function currentTokenAmount() external view returns (uint256);

    function currentExpectedBalance() external view returns (uint256);

    function currentKTokenAddress() external view returns (address);

    function currentTokenAddress() external view returns (address);

    /* ADMIN FUNCTIONS */

    function registerKToken(address kTokenAddress) external;

    function setPoolReward(uint256 poolRewardBips) external;

    function setPlatformReward(uint256 platformRewardBips) external;

    function setPlatformVaultAddress(address platformVaultAddress) external;
}