//
//  BackgroundTasks.swift
//  map_mapkit_ios
//
//  Created by 诺诺诺的言 on 2025/7/14.
//

import BackgroundTasks
import Combine

@available(iOS 13.0, *)
class BackgroundTaskManager {
    static let shared = BackgroundTaskManager()
    private let backgroundTaskIdentifier = "com.your.app.screenlock.monitor"
    
    func registerBackgroundTask() {
        BGTaskScheduler.shared.register(
            forTaskWithIdentifier: backgroundTaskIdentifier,
            using: nil
        ) { task in
            self.handleBackgroundTask(task: task as! BGProcessingTask)
        }
    }
    
    func scheduleBackgroundTask() {
        let request = BGProcessingTaskRequest(identifier: backgroundTaskIdentifier)
        request.requiresNetworkConnectivity = false
        request.requiresExternalPower = false
        request.earliestBeginDate = Date(timeIntervalSinceNow: 60) // 1分钟后
        
        do {
            try BGTaskScheduler.shared.submit(request)
        } catch {
            print("无法提交后台任务: \(error.localizedDescription)")
        }
    }
    
    private func handleBackgroundTask(task: BGProcessingTask) {
        // 设置任务过期处理
        task.expirationHandler = {
            task.setTaskCompleted(success: false)
        }
        
        // 开始监测
        ScreenLockMonitor.shared.startMonitoringInBackground()
        
        // 安排下一个任务
        self.scheduleBackgroundTask()
        
        task.setTaskCompleted(success: true)
    }
}


import Foundation

// 定义屏幕事件类型
struct ScreenEvent: Codable {
    let timestamp: Date
    let eventType: EventType
    
    enum EventType: String, Codable {
        case lock = "锁屏"
        case unlock = "解锁"
    }
}



@available(iOS 13.0, *)
class ScreenLockMonitor {
    static let shared = ScreenLockMonitor()
    private var lastState: Bool?
    private let stateChangeSubject = PassthroughSubject<ScreenEvent, Never>()
    
    var stateChangePublisher: AnyPublisher<ScreenEvent, Never> {
        stateChangeSubject.eraseToAnyPublisher()
    }
    
    func startMonitoringInBackground() {
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(protectedDataWillBecomeUnavailable),
            name: UIApplication.protectedDataWillBecomeUnavailableNotification,
            object: nil
        )
        
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(protectedDataDidBecomeAvailable),
            name: UIApplication.protectedDataDidBecomeAvailableNotification,
            object: nil
        )
        
        // 启动时检查当前状态
        checkInitialState()
    }
    
    private func checkInitialState() {
        let isProtectedDataAvailable = UIApplication.shared.isProtectedDataAvailable
        if lastState != isProtectedDataAvailable {
            lastState = isProtectedDataAvailable
            let event = ScreenEvent(
                timestamp: Date(),
                eventType: isProtectedDataAvailable ? .unlock : .lock
            )
            persistEvent(event: event)
        }
    }
    
    @objc private func protectedDataWillBecomeUnavailable() {
        recordEvent(eventType: .lock)
    }
    
    @objc private func protectedDataDidBecomeAvailable() {
        recordEvent(eventType: .unlock)
    }
    
    private func recordEvent(eventType: ScreenEvent.EventType) {
        let event = ScreenEvent(
            timestamp: Date(),
            eventType: eventType
        )
        persistEvent(event: event)
        stateChangeSubject.send(event)
    }
    
    private func persistEvent(event: ScreenEvent) {
        // 使用CoreData持久化存储
        //CoreDataManager.shared.saveScreenEvent(event)
        print("eventsfsfdsd---\(event.timestamp)---\(event.eventType)")
        
        // 同时写入文件备份
        FileStorageManager.shared.saveEvent(event)
    }
}


import CoreData

class CoreDataManager {
    static let shared = CoreDataManager()
    private let persistentContainer: NSPersistentContainer
    
    private init() {
        persistentContainer = NSPersistentContainer(name: "ScreenEventsModel")
        persistentContainer.loadPersistentStores { description, error in
            if let error = error {
                fatalError("无法加载CoreData存储: \(error)")
            }
        }
    }
    
    func getEventsBetween(startDate: Date, endDate: Date) -> [ScreenEvent] {
        let request: NSFetchRequest<ScreenEventEntity> = ScreenEventEntity.fetchRequest()
        
        // 设置时间范围谓词
        request.predicate = NSPredicate(
            format: "timestamp >= %@ AND timestamp <= %@",
            startDate as NSDate,
            endDate as NSDate
        )
        
        // 按时间升序排列
        request.sortDescriptors = [NSSortDescriptor(key: "timestamp", ascending: true)]
        
        do {
            let results = try persistentContainer.viewContext.fetch(request)
            return results.compactMap {
                guard let timestamp = $0.timestamp else { return nil }
                return ScreenEvent(
                    timestamp: timestamp,
                    eventType: ScreenEvent.EventType(rawValue: $0.eventType ?? "lock") ?? .lock
                )
            }
        } catch {
            print("查询事件失败: \(error)")
            return []
        }
    }
    
    func saveScreenEvent(_ event: ScreenEvent) {
        let context = persistentContainer.viewContext
        let entity = ScreenEventEntity(context: context)
        entity.timestamp = event.timestamp
        entity.eventType = event.eventType.rawValue
        
        do {
            try context.save()
        } catch {
            print("保存事件失败: \(error)")
        }
    }
    
    func getAllEvents() -> [ScreenEvent] {
        let request: NSFetchRequest<ScreenEventEntity> = ScreenEventEntity.fetchRequest()
        request.sortDescriptors = [NSSortDescriptor(key: "timestamp", ascending: false)]
        
        do {
            let results = try persistentContainer.viewContext.fetch(request)
            return results.map {
                ScreenEvent(
                    timestamp: $0.timestamp ?? Date(),
                    eventType: ScreenEvent.EventType(rawValue: $0.eventType ?? "lock") ?? .lock
                )
            }
        } catch {
            print("获取事件失败: \(error)")
            return []
        }
    }
}

// CoreData实体
public class ScreenEventEntity: NSManagedObject {
    @NSManaged public var timestamp: Date?
    @NSManaged public var eventType: String?
}

extension ScreenEventEntity {
    @nonobjc public class func fetchRequest() -> NSFetchRequest<ScreenEventEntity> {
        return NSFetchRequest<ScreenEventEntity>(entityName: "ScreenEventEntity")
    }
}




class FileStorageManager {
    static let shared = FileStorageManager()
    private let fileURL = FileManager.default
        .urls(for: .documentDirectory, in: .userDomainMask)[0]
        .appendingPathComponent("screenEventsBackup.json")
    
    func saveEvent(_ event: ScreenEvent) {
        var existingEvents = loadEvents()
        existingEvents.append(event)
        
        do {
            let data = try JSONEncoder().encode(existingEvents)
            try data.write(to: fileURL)
        } catch {
            print("文件存储失败: \(error)")
        }
    }
    
    func loadEvents() -> [ScreenEvent] {
        do {
            let data = try Data(contentsOf: fileURL)
            return try JSONDecoder().decode([ScreenEvent].self, from: data)
        } catch {
            return []
        }
    }
        
    /// 从JSON文件中获取时间范围内的事件
      func getEventsBetween(startDate: Date, endDate: Date) -> [ScreenEvent] {
          let allEvents = loadEvents()
          return allEvents.filter {
              $0.timestamp >= startDate && $0.timestamp <= endDate
          }.sorted {
              $0.timestamp < $1.timestamp
          }
      }
}


class EventQueryService {
    static let shared = EventQueryService()
    
    /// 获取时间范围内的事件并转换为字典列表
    func getEventPairsBetween(startDate: Date, endDate: Date) -> [[String: Any]] {
        // 获取原始事件（已按时间排序）
        let events = getOrderedEventsBetween(startDate: startDate, endDate: endDate)
        var result = [[String: Any]]()
        var currentLockEvent: ScreenEvent?
        
        for event in events {
            switch event.eventType {
            case .lock:
                // 如果遇到新的锁屏事件而前一个未配对，则保存前一个不完整记录
                if let lockEvent = currentLockEvent {
                    result.append([
                        "startTime": lockEvent.timestamp,
                        "endTime": event.timestamp // 异常情况：两个锁屏事件之间没有解锁
                    ])
                }
                currentLockEvent = event
                
            case .unlock:
                if let lockEvent = currentLockEvent {
                    // 正常情况：锁屏-解锁配对
                    result.append([
                        "startTime": lockEvent.timestamp,
                        "endTime": event.timestamp
                    ])
                    currentLockEvent = nil
                } else {
                    // 异常情况：第一个事件是解锁事件
                    result.append([
                        "startTime": startDate, // 用查询开始时间作为默认值
                        "endTime": event.timestamp
                    ])
                }
            }
        }
        
        // 处理最后一个未配对的锁屏事件
        if let lockEvent = currentLockEvent {
            result.append([
                "startTime": lockEvent.timestamp,
                "endTime": 0 // 用查询结束时间作为默认值
            ])
        }
        
        return result
    }
    
    /// 私有方法：获取排序后的事件列表
    private func getOrderedEventsBetween(startDate: Date, endDate: Date) -> [ScreenEvent] {
        // 从CoreData获取
//        let coreDataEvents = CoreDataManager.shared.getEventsBetween(
//            startDate: startDate,
//            endDate: endDate
//        )
        
        // 从文件备份获取
        let fileEvents = FileStorageManager.shared.getEventsBetween(
            startDate: startDate,
            endDate: endDate
        )
        
        // 合并、去重并排序
        var allEvents = fileEvents;//Array<Any>(Set.init(from: fileEvents)) // 去重
        allEvents.sort { $0.timestamp < $1.timestamp } // 按时间升序
        
        return allEvents
    }
}