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

pragma solidity >=0.8.0;

import '../libraries/Types.sol';

/// @dev Candidate registry interface
/// @author Alexandas
interface ICandidateRegistry {

	/// @dev emit when candidate registered
	/// @param candidate candidate address
	event Register(address candidate);

	/// @dev register a candidate with node manifest
	/// @param manifest node manifest
	function register(string memory manifest) external;

	/// @dev return a candidate
	/// @param candidate candidate address
	/// @return candidate information
	function candidateInfo(address candidate) external view returns(Types.CandidateInfo memory);

	/// @dev return a candidate address for a specific node manifest
	/// @param manifest node manifest
	/// @return candidate address
	function manifestMap(string memory manifest) external view returns(address);

	/// @dev return whether a candidate is registered
	/// @param candidate candidate address
	/// @return whether the candidate is registered
	function isCandidateRegistered(address candidate) external view returns (bool);

	/// @dev return grade of a candidate
	/// @param candidate candidate address
	/// @return candidate grade
	function gradeOf(address candidate) external view returns (Types.Grade);

}