//
//  PushHandler.swift
//  AIGrammar
//
//  Created by oscar on 2024/8/31.
//

import UIKit
import SwiftUI
import UserNotifications

enum PromotionDisplayType {
    case halfScreen
    case fullScreen
    case urlLink(String) // URL 链接，可以传递 URL 字符串
}

class NofifyState: ObservableObject {
    @Published var selectedTab: Int = 0
    @Published var showPromotion: Bool = false
    @Published var promotionMode: PromotionDisplayType = .halfScreen
}

class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDelegate {
    // 保存 AIGrammarApp 的实例
    var app: AIGrammarApp?
    
    var window: UIWindow?
    var rootView: ContentView?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        // 设置 UNUserNotificationCenter 的 delegate
        UNUserNotificationCenter.current().delegate = self
        
        // 注册推送通知
        registerForPushNotifications()
        return true
    }

    func registerForPushNotifications() {
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { granted, error in
            logger.info("Permission granted: \(granted)")
            guard granted else { return }
            self.getNotificationSettings()
        }
    }

    func getNotificationSettings() {
        UNUserNotificationCenter.current().getNotificationSettings { settings in
            logger.info("Notification settings: \(settings)")
            guard settings.authorizationStatus == .authorized else { return }
            DispatchQueue.main.async {
                UIApplication.shared.registerForRemoteNotifications()
            }
        }
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
        let token = tokenParts.joined()
        logger.info("Device Token: \(token)")
        // 你可以在此处将 token 发送到你的服务器
    }

    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        logger.error("Failed to register: \(error)")
    }
    
    /*
    // 处理前台接收推送通知
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        logger.info("get push msg in willPresent")
        globalEnvironment.pushSettings.appAtFront = true
        //completionHandler([.sound, .banner])
    }
     */

    // 处理用户响应推送通知
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        logger.info("get push msg in didReceive")
        let userInfo = response.notification.request.content.userInfo
        
        // 解析相关的参数，保存到全局变量中。等用户唤起主界面后执行
        globalEnvironment.pushSettings.gotoTab = extractValue(from: userInfo, key: "gotoTab", defaultValue: 0, logMessage: "gotoTab not found or invalid in userInfo")
        globalEnvironment.pushSettings.showPage = extractValue(from: userInfo, key: "showPage", defaultValue: 0, logMessage: "showPage not found or invalid in userInfo") != 0
        globalEnvironment.pushSettings.page = extractValue(from: userInfo, key: "page", defaultValue: "", logMessage: "page not found or invalid in userInfo")
        globalEnvironment.pushSettings.showMode = extractValue(from: userInfo, key: "showMode", defaultValue: "", logMessage: "showMode not found or invalid in userInfo")
        globalEnvironment.pushSettings.openURL = extractValue(from: userInfo, key: "url", defaultValue: "", logMessage: "url not found or invalid in userInfo")

        // 如果推送过来的时候，已经在前台了，需要触发一下
        if globalEnvironment.pushSettings.appAtFront {
            DispatchQueue.main.async {
                self.app?.handlePushNotification()
            }
            globalEnvironment.pushSettings.appAtFront = false
        }
        completionHandler()
    }

    // 解析 userInfo 的通用函数
    func extractValue<T>(from userInfo: [AnyHashable: Any], key: String, defaultValue: T, logMessage: String) -> T {
        if let value = userInfo[key] as? T {
            return value
        } else {
            logger.info(logMessage)
            return defaultValue
        }
    }

}


struct PromotionView: View {
    var body: some View {
        Text("This is the Promotion View")
    }
}