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

import Foundation

final class SDLTunnelAppNotifier {
    struct Event: Codable, Sendable {
        enum Level: String, Codable, Sendable {
            case info
            case warning
            case error
            case fatal
        }
        
        let id: String
        let timestamp: TimeInterval
        let level: Level
        let code: Int?
        let message: String
    }
    
    static let shared = SDLTunnelAppNotifier()
    
    static let appGroupSuiteName = "group.com.jihe.punchnetmac"
    static let latestEventKey = "tunnel.latestEvent"
    
    private let suiteName: String
    private let eventKey: String
    
    init(suiteName: String = SDLTunnelAppNotifier.appGroupSuiteName,
         eventKey: String = SDLTunnelAppNotifier.latestEventKey) {
        self.suiteName = suiteName
        self.eventKey = eventKey
    }
    
    func publish(level: Event.Level = .error, code: Int? = nil, message: String) {
        let event = Event(
            id: UUID().uuidString,
            timestamp: Date().timeIntervalSince1970,
            level: level,
            code: code,
            message: message
        )
        self.publish(event)
    }
    
    func publish(_ event: Event) {
        guard let shared = UserDefaults(suiteName: self.suiteName),
              let data = try? JSONEncoder().encode(event) else {
            return
        }
        
        shared.set(data, forKey: self.eventKey)
        shared.synchronize()
        DarwinNotificationCenter.shared.post(.tunnelEventChanged)
    }
    
    func clear() {
        guard let shared = UserDefaults(suiteName: self.suiteName) else {
            return
        }
        
        shared.removeObject(forKey: self.eventKey)
        shared.synchronize()
        DarwinNotificationCenter.shared.post(.tunnelEventChanged)
    }
}