// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity >=0.8.0;

import '@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol';
import './IERC20.sol';

/// @dev Rewarder interface
/// @author Alexandas
interface IRewarder {

	/// @dev emit when ERC20 token address updated
	/// @param token ERC20 token address
	event TokenUpdated(IERC20 token);

	/// @dev emit when auth address updated
	/// @param auth authorized address
	event AuthUpdated(address auth);

	/// @dev emit when reward minted
	/// @param from authorized address
	/// @param to receiver address
	/// @param amount token amount
	event Minted(address from, address to, uint256 amount);

	/// @dev return ERC20 token address
	function token() external view returns(IERC20);

	/// @dev mint reward to receiver
	/// @param to receiver address
	/// @param amount token amount
	function mint(address to, uint256 amount) external;

}