/**
 * iOS AudioSession Configuration Helpers
 *
 * CRITICAL: This must be configured BEFORE connecting to LiveKit room!
 * Without proper AudioSession setup, microphone won't work on iOS.
 */

import { Platform } from 'react-native';

// AudioSession module - use 'any' to avoid complex typing issues with @livekit/react-native
// The actual AudioSession from LiveKit has specific enum types that are hard to match statically
let audioSessionModule: any = null;

/**
 * Import AudioSession module lazily
 * This is needed because @livekit/react-native must be imported after registerGlobals()
 */
async function getAudioSession(): Promise<any | null> {
  if (Platform.OS !== 'ios') return null;

  if (!audioSessionModule) {
    const livekit = await import('@livekit/react-native');
    audioSessionModule = livekit.AudioSession;
  }

  return audioSessionModule;
}

/**
 * Configure iOS AudioSession for bidirectional voice call
 *
 * MUST be called BEFORE connecting to LiveKit room!
 *
 * Configuration:
 * - Category: playAndRecord (both speaker and mic)
 * - Mode: voiceChat (optimized for voice calls)
 * - Options: Bluetooth, speaker, mix with others
 */
export async function configureAudioForVoiceCall(): Promise<void> {
  if (Platform.OS !== 'ios') {
    console.log('[AudioSession] Skipping on non-iOS platform');
    return;
  }

  console.log('[AudioSession] Configuring for voice call...');

  try {
    const AudioSession = await getAudioSession();
    if (!AudioSession) {
      console.error('[AudioSession] Failed to get AudioSession module');
      return;
    }

    // Step 1: Set Apple-specific audio configuration
    console.log('[AudioSession] Step 1: Setting Apple audio config...');
    await AudioSession.setAppleAudioConfiguration({
      audioCategory: 'playAndRecord',
      audioCategoryOptions: [
        'allowBluetooth',
        'allowBluetoothA2DP',
        'defaultToSpeaker',
        'mixWithOthers',
      ],
      audioMode: 'voiceChat',
    });

    // Step 2: Configure default output to speaker
    console.log('[AudioSession] Step 2: Setting default output...');
    await AudioSession.configureAudio({
      ios: {
        defaultOutput: 'speaker',
      },
    });

    // Step 3: Start the audio session
    console.log('[AudioSession] Step 3: Starting audio session...');
    await AudioSession.startAudioSession();

    console.log('[AudioSession] Configuration complete!');
  } catch (error) {
    console.error('[AudioSession] Configuration error:', error);
    throw error;
  }
}

/**
 * Stop iOS AudioSession
 *
 * Should be called when disconnecting from voice call
 */
export async function stopAudioSession(): Promise<void> {
  if (Platform.OS !== 'ios') {
    return;
  }

  console.log('[AudioSession] Stopping audio session...');

  try {
    const AudioSession = await getAudioSession();
    if (!AudioSession) {
      return;
    }

    await AudioSession.stopAudioSession();
    console.log('[AudioSession] Stopped');
  } catch (error) {
    console.error('[AudioSession] Error stopping:', error);
    // Don't throw - cleanup errors are not critical
  }
}

/**
 * Reconfigure audio session after remote track arrives
 *
 * Sometimes iOS needs a kick to properly route audio after remote participant joins
 */
export async function reconfigureAudioForPlayback(): Promise<void> {
  if (Platform.OS !== 'ios') {
    return;
  }

  console.log('[AudioSession] Reconfiguring for playback...');

  try {
    const AudioSession = await getAudioSession();
    if (!AudioSession) {
      return;
    }

    // Just reconfigure the same settings - this "refreshes" the audio routing
    await AudioSession.setAppleAudioConfiguration({
      audioCategory: 'playAndRecord',
      audioCategoryOptions: [
        'allowBluetooth',
        'allowBluetoothA2DP',
        'defaultToSpeaker',
        'mixWithOthers',
      ],
      audioMode: 'voiceChat',
    });

    console.log('[AudioSession] Reconfigured successfully');
  } catch (error) {
    console.error('[AudioSession] Reconfigure error:', error);
    // Don't throw - this is a best-effort operation
  }
}

/**
 * Switch audio output between speaker and earpiece
 *
 * @param useSpeaker - true for speaker, false for earpiece
 */
export async function setAudioOutput(useSpeaker: boolean): Promise<void> {
  if (Platform.OS !== 'ios') {
    console.log('[AudioSession] setAudioOutput - skipping on non-iOS');
    return;
  }

  console.log(`[AudioSession] Setting audio output to ${useSpeaker ? 'SPEAKER' : 'EARPIECE'}...`);

  try {
    const AudioSession = await getAudioSession();
    if (!AudioSession) {
      console.error('[AudioSession] Failed to get AudioSession module');
      return;
    }

    // Configure audio output
    await AudioSession.configureAudio({
      ios: {
        defaultOutput: useSpeaker ? 'speaker' : 'earpiece',
      },
    });

    // Also update the full configuration to ensure it takes effect
    await AudioSession.setAppleAudioConfiguration({
      audioCategory: 'playAndRecord',
      audioCategoryOptions: useSpeaker
        ? ['allowBluetooth', 'allowBluetoothA2DP', 'defaultToSpeaker', 'mixWithOthers']
        : ['allowBluetooth', 'allowBluetoothA2DP', 'mixWithOthers'],
      audioMode: 'voiceChat',
    });

    console.log(`[AudioSession] Audio output set to ${useSpeaker ? 'SPEAKER' : 'EARPIECE'}`);
  } catch (error) {
    console.error('[AudioSession] setAudioOutput error:', error);
  }
}