//
//  SDLSuperRegistrationStateMachine.swift
//  Tun
//
//  Created by 安礼成 on 2026/4/15.
//

import Foundation

final class SDLSuperRegistrationStateMachine {
    enum State: Equatable {
        case idle
        case registering
        case registered
        case failed
    }
    
    enum LoopAction {
        case sendRegister
        case stop
    }
    
    enum WaitDecision {
        case retry
        case registered
        case stop
    }
    
    private(set) var state: State = .idle
    
    func beginLoop() -> Bool {
        guard self.state != .registering else {
            return false
        }
        
        self.state = .registering
        return true
    }
    
    func makeLoopAction() -> LoopAction {
        switch self.state {
        case .registering:
            return .sendRegister
        case .idle, .registered, .failed:
            return .stop
        }
    }
    
    func makeWaitDecision() -> WaitDecision {
        switch self.state {
        case .registering:
            return .retry
        case .registered:
            return .registered
        case .idle, .failed:
            return .stop
        }
    }
    
    func handleRegisterSuperAck() {
        self.state = .registered
    }
    
    func handleRetryableNak() {
        self.state = .failed
    }
    
    func handleFailure() {
        self.state = .failed
    }
    
    func reset() {
        self.state = .idle
    }
    
}