package bot.molt.android

import android.app.Notification
import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.Service
import android.app.PendingIntent
import android.Manifest
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.content.pm.ServiceInfo
import androidx.core.app.NotificationCompat
import androidx.core.content.ContextCompat
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.SupervisorJob
import kotlinx.coroutines.cancel
import kotlinx.coroutines.flow.combine
import kotlinx.coroutines.launch

class NodeForegroundService : Service() {
  private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
  private var notificationJob: Job? = null
  private var lastRequiresMic = false
  private var didStartForeground = false

  override fun onCreate() {
    super.onCreate()
    ensureChannel()
    val initial = buildNotification(title = "Moltbot Node", text = "Starting…")
    startForegroundWithTypes(notification = initial, requiresMic = false)

    val runtime = (application as NodeApp).runtime
    notificationJob =
      scope.launch {
        combine(
          runtime.statusText,
          runtime.serverName,
          runtime.isConnected,
          runtime.voiceWakeMode,
          runtime.voiceWakeIsListening,
        ) { status, server, connected, voiceMode, voiceListening ->
          Quint(status, server, connected, voiceMode, voiceListening)
        }.collect { (status, server, connected, voiceMode, voiceListening) ->
          val title = if (connected) "Moltbot Node · Connected" else "Moltbot Node"
          val voiceSuffix =
            if (voiceMode == VoiceWakeMode.Always) {
              if (voiceListening) " · Voice Wake: Listening" else " · Voice Wake: Paused"
            } else {
              ""
            }
          val text = (server?.let { "$status · $it" } ?: status) + voiceSuffix

          val requiresMic =
            voiceMode == VoiceWakeMode.Always && hasRecordAudioPermission()
          startForegroundWithTypes(
            notification = buildNotification(title = title, text = text),
            requiresMic = requiresMic,
          )
        }
      }
  }

  override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
    when (intent?.action) {
      ACTION_STOP -> {
        (application as NodeApp).runtime.disconnect()
        stopSelf()
        return START_NOT_STICKY
      }
    }
    // Keep running; connection is managed by NodeRuntime (auto-reconnect + manual).
    return START_STICKY
  }

  override fun onDestroy() {
    notificationJob?.cancel()
    scope.cancel()
    super.onDestroy()
  }

  override fun onBind(intent: Intent?) = null

  private fun ensureChannel() {
    val mgr = getSystemService(NotificationManager::class.java)
    val channel =
      NotificationChannel(
        CHANNEL_ID,
        "Connection",
        NotificationManager.IMPORTANCE_LOW,
      ).apply {
        description = "Moltbot node connection status"
        setShowBadge(false)
      }
    mgr.createNotificationChannel(channel)
  }

  private fun buildNotification(title: String, text: String): Notification {
    val launchIntent = Intent(this, MainActivity::class.java).apply {
      flags = Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP
    }
    val launchPending =
      PendingIntent.getActivity(
        this,
        1,
        launchIntent,
        PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
      )

    val stopIntent = Intent(this, NodeForegroundService::class.java).setAction(ACTION_STOP)
    val stopPending =
      PendingIntent.getService(
        this,
        2,
        stopIntent,
        PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
      )

    return NotificationCompat.Builder(this, CHANNEL_ID)
      .setSmallIcon(R.mipmap.ic_launcher)
      .setContentTitle(title)
      .setContentText(text)
      .setContentIntent(launchPending)
      .setOngoing(true)
      .setOnlyAlertOnce(true)
      .setForegroundServiceBehavior(NotificationCompat.FOREGROUND_SERVICE_IMMEDIATE)
      .addAction(0, "Disconnect", stopPending)
      .build()
  }

  private fun updateNotification(notification: Notification) {
    val mgr = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    mgr.notify(NOTIFICATION_ID, notification)
  }

  private fun startForegroundWithTypes(notification: Notification, requiresMic: Boolean) {
    if (didStartForeground && requiresMic == lastRequiresMic) {
      updateNotification(notification)
      return
    }

    lastRequiresMic = requiresMic
    val types =
      if (requiresMic) {
        ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC or ServiceInfo.FOREGROUND_SERVICE_TYPE_MICROPHONE
      } else {
        ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC
      }
    startForeground(NOTIFICATION_ID, notification, types)
    didStartForeground = true
  }

  private fun hasRecordAudioPermission(): Boolean {
    return (
      ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) ==
        PackageManager.PERMISSION_GRANTED
      )
  }

  companion object {
    private const val CHANNEL_ID = "connection"
    private const val NOTIFICATION_ID = 1

    private const val ACTION_STOP = "bot.molt.android.action.STOP"

    fun start(context: Context) {
      val intent = Intent(context, NodeForegroundService::class.java)
      context.startForegroundService(intent)
    }

    fun stop(context: Context) {
      val intent = Intent(context, NodeForegroundService::class.java).setAction(ACTION_STOP)
      context.startService(intent)
    }
  }
}

private data class Quint<A, B, C, D, E>(val first: A, val second: B, val third: C, val fourth: D, val fifth: E)
