package com.example.playback

import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.PendingIntent
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.media.AudioManager
import android.os.Build
import androidx.media3.common.util.UnstableApi
import androidx.media3.session.DefaultMediaNotificationProvider
import androidx.media3.session.MediaSession
import androidx.media3.session.MediaSessionService
import com.example.MainActivity

@UnstableApi
class SwipePlayMediaService : MediaSessionService() {

  private var mediaSession: MediaSession? = null
  private var becomingNoisyReceiver: BroadcastReceiver? = null

  override fun onCreate() {
    super.onCreate()

    createNotificationChannel()

    val player = PlaybackManager.getOrCreatePlayer(applicationContext)

    val sessionActivityPendingIntent = PendingIntent.getActivity(
      this,
      0,
      Intent(this, MainActivity::class.java),
      PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
    )

    mediaSession = MediaSession.Builder(this, player)
      .setSessionActivity(sessionActivityPendingIntent)
      .build()

    setMediaNotificationProvider(
      DefaultMediaNotificationProvider.Builder(this)
        .setChannelId(CHANNEL_ID)
        .build()
    )

    registerBecomingNoisyReceiver()
  }

  override fun onGetSession(controllerInfo: MediaSession.ControllerInfo): MediaSession? {
    return mediaSession
  }

  override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
    super.onStartCommand(intent, flags, startId)
    return START_NOT_STICKY
  }

  private fun registerBecomingNoisyReceiver() {
    becomingNoisyReceiver = object : BroadcastReceiver() {
      override fun onReceive(context: Context?, intent: Intent?) {
        if (intent?.action == AudioManager.ACTION_AUDIO_BECOMING_NOISY) {
          PlaybackManager.pause()
        }
      }
    }
    registerReceiver(
      becomingNoisyReceiver,
      IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY)
    )
  }

  private fun createNotificationChannel() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
      val channel = NotificationChannel(
        CHANNEL_ID,
        "SwipePlay Playback",
        NotificationManager.IMPORTANCE_LOW
      ).apply {
        description = "Background audio playback notifications"
        setShowBadge(false)
      }
      val manager = getSystemService(NotificationManager::class.java)
      manager?.createNotificationChannel(channel)
    }
  }

  override fun onDestroy() {
    becomingNoisyReceiver?.let {
      try {
        unregisterReceiver(it)
      } catch (_: Exception) {}
      becomingNoisyReceiver = null
    }

    mediaSession?.run {
      release()
      mediaSession = null
    }
    super.onDestroy()
  }

  companion object {
    const val CHANNEL_ID = "swipeplay_playback_channel"
  }
}