package com.hikoncont.service

import android.app.*
import android.content.Context
import android.content.Intent
import android.os.IBinder
import android.os.PowerManager
import android.util.Log
import androidx.core.app.NotificationCompat
import kotlinx.coroutines.*
import java.io.File

/**
 * 进程监控服务
 * 监控主进程状态，在进程被杀死时立即启动恢复机制
 */
class ProcessMonitorService : Service() {

    companion object {
        private const val TAG = "ProcessMonitorService"
        private const val CHECK_INTERVAL = 1000L // ✅ 激进：1秒检查一次进程状态
        private const val NOTIFICATION_ID = 9999
        private const val CHANNEL_ID = "process_monitor_channel"
        
        // 进程状态文件路径
        private const val PROCESS_STATUS_FILE = "process_status.txt"
    }

    private val serviceScope = CoroutineScope(Dispatchers.IO + SupervisorJob())
    private var monitorJob: Job? = null
    private var wakeLock: PowerManager.WakeLock? = null
    private var notificationManager: NotificationManager? = null
    private var isMonitoring = false

    override fun onCreate() {
        super.onCreate()
        Log.i(TAG, "🔍 进程监控服务创建")
        
        // 初始化通知管理器
        initNotificationManager()
        
        // 获取WakeLock保活
        acquireWakeLock()
        
        // 启动前台服务
        startForegroundService()
        
        // 开始监控
        startMonitoring()
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        Log.i(TAG, "🔍 进程监控服务启动命令")
        return START_STICKY
    }

    override fun onBind(intent: Intent?): IBinder? {
        return null
    }

    override fun onDestroy() {
        Log.i(TAG, "🛑 进程监控服务销毁")
        
        // 释放WakeLock
        releaseWakeLock()
        
        // 停止监控
        stopMonitoring()
        
        // 启动激进恢复机制
        scheduleAggressiveRecovery()
        
        serviceScope.cancel()
        super.onDestroy()
    }

    override fun onTaskRemoved(rootIntent: Intent?) {
        Log.w(TAG, "🧹 检测到任务被移除(onTaskRemoved)，启动激进恢复")
        scheduleAggressiveRecovery()
        super.onTaskRemoved(rootIntent)
    }

    /**
     * 初始化通知管理器
     */
    private fun initNotificationManager() {
        try {
            notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
                val channel = NotificationChannel(
                    CHANNEL_ID,
                    "进程监控服务",
                    NotificationManager.IMPORTANCE_LOW
                ).apply {
                    description = "监控主进程状态"
                    setShowBadge(false)
                }
                notificationManager?.createNotificationChannel(channel)
            }
        } catch (e: Exception) {
            Log.e(TAG, "❌ 初始化通知管理器失败", e)
        }
    }

    /**
     * 启动前台服务
     */
    private fun startForegroundService() {
        try {
            val notification = NotificationCompat.Builder(this, CHANNEL_ID)
                .setContentTitle("进程监控服务")
                .setContentText("正在监控主进程状态")
                .setSmallIcon(android.R.drawable.ic_dialog_info)
                .setOngoing(true)
                .setPriority(NotificationCompat.PRIORITY_LOW)
                .build()

            startForeground(NOTIFICATION_ID, notification)
            Log.i(TAG, "✅ 前台服务已启动")
        } catch (e: Exception) {
            Log.e(TAG, "❌ 启动前台服务失败", e)
        }
    }

    /**
     * 获取WakeLock保活
     */
    private fun acquireWakeLock() {
        try {
            val powerManager = getSystemService(Context.POWER_SERVICE) as PowerManager
            wakeLock = powerManager.newWakeLock(
                PowerManager.PARTIAL_WAKE_LOCK,
                "RemoteControl::ProcessMonitorService"
            )
            wakeLock?.acquire(24 * 60 * 60 * 1000L) // 24小时
            Log.i(TAG, "🔋 ProcessMonitorService WakeLock已获取")
        } catch (e: Exception) {
            Log.e(TAG, "❌ 获取ProcessMonitorService WakeLock失败", e)
        }
    }

    /**
     * 释放WakeLock
     */
    private fun releaseWakeLock() {
        try {
            wakeLock?.let {
                if (it.isHeld) {
                    it.release()
                    Log.i(TAG, "🔋 ProcessMonitorService WakeLock已释放")
                }
            }
        } catch (e: Exception) {
            Log.e(TAG, "❌ 释放ProcessMonitorService WakeLock失败", e)
        }
    }

    /**
     * 开始监控
     */
    private fun startMonitoring() {
        if (isMonitoring) {
            Log.w(TAG, "⚠️ 进程监控已在运行")
            return
        }

        isMonitoring = true
        Log.i(TAG, "🔍 开始进程状态监控")

        monitorJob = serviceScope.launch {
            while (isActive && isMonitoring) {
                try {
                    // 更新进程状态文件
                    updateProcessStatus()
                    
                    // 检查主进程是否存活
                    if (!isMainProcessAlive()) {
                        Log.w(TAG, "⚠️ 检测到主进程死亡，启动恢复机制")
                        scheduleAggressiveRecovery()
                    }
                    
                    delay(CHECK_INTERVAL)
                } catch (e: Exception) {
                    Log.e(TAG, "❌ 进程监控异常", e)
                    delay(CHECK_INTERVAL)
                }
            }
        }
    }

    /**
     * 停止监控
     */
    private fun stopMonitoring() {
        isMonitoring = false
        monitorJob?.cancel()
        Log.i(TAG, "🛑 进程监控已停止")
    }

    /**
     * 更新进程状态文件
     */
    private fun updateProcessStatus() {
        try {
            val statusFile = File(filesDir, PROCESS_STATUS_FILE)
            val currentTime = System.currentTimeMillis()
            val pid = android.os.Process.myPid()
            
            statusFile.writeText("$pid:$currentTime")
        } catch (e: Exception) {
            Log.e(TAG, "❌ 更新进程状态文件失败", e)
        }
    }

    /**
     * 检查主进程是否存活
     */
    private fun isMainProcessAlive(): Boolean {
        return try {
            val statusFile = File(filesDir, PROCESS_STATUS_FILE)
            if (!statusFile.exists()) {
                return false
            }
            
            val content = statusFile.readText()
            val parts = content.split(":")
            if (parts.size != 2) {
                return false
            }
            
            val timestamp = parts[1].toLongOrNull() ?: return false
            val currentTime = System.currentTimeMillis()
            
            // 如果状态文件超过5秒没有更新，认为进程死亡
            (currentTime - timestamp) < 5000
        } catch (e: Exception) {
            Log.e(TAG, "❌ 检查主进程状态失败", e)
            false
        }
    }

    /**
     * 启动激进恢复机制
     */
    private fun scheduleAggressiveRecovery() {
        try {
            Log.i(TAG, "🚀 启动激进恢复机制")
            
            // 立即启动前台服务
            val rcfsIntent = Intent(this, RemoteControlForegroundService::class.java).apply {
                action = "RESTART_SERVICE"
            }
            startForegroundService(rcfsIntent)
            
            // 立即启动保活服务
            val keepAliveIntent = Intent(this, KeepAliveService::class.java)
            startService(keepAliveIntent)
            
            // 使用AlarmManager安排延迟恢复
            val alarmManager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
            
            val rcfsPI = PendingIntent.getForegroundService(
                this,
                (System.currentTimeMillis() % 10000).toInt(),
                rcfsIntent,
                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
            )
            
            val keepAlivePI = PendingIntent.getService(
                this,
                (System.currentTimeMillis() % 10000).toInt() + 1,
                keepAliveIntent,
                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
            )
            
            val triggerAt = System.currentTimeMillis() + 50 // 50ms延迟
            
            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, triggerAt, rcfsPI)
            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, triggerAt + 50, keepAlivePI)
            
            Log.i(TAG, "✅ 激进恢复机制已启动")
        } catch (e: Exception) {
            Log.e(TAG, "❌ 启动激进恢复机制失败", e)
        }
    }
}