/**
 * Audio Session Configuration Helpers (iOS + Android)
 *
 * CRITICAL: This must be configured BEFORE connecting to LiveKit room!
 * Without proper AudioSession setup, microphone won't work on iOS.
 * On Android, this controls speaker/earpiece routing.
 */

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

  return audioSessionModule;
}

/**
 * Configure AudioSession for bidirectional voice call (iOS + Android)
 *
 * MUST be called BEFORE connecting to LiveKit room!
 *
 * iOS Configuration:
 * - Category: playAndRecord (both speaker and mic)
 * - Mode: voiceChat (optimized for voice calls)
 * - Options: Bluetooth, speaker, mix with others
 *
 * Android Configuration:
 * - audioTypeOptions: communication (for voice calls)
 * - forceHandleAudioRouting: true (to control speaker/earpiece)
 */
export async function configureAudioForVoiceCall(): Promise<void> {
  console.log(`[AudioSession] Configuring for voice call on ${Platform.OS}...`);

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

    if (Platform.OS === 'ios') {
      // iOS-specific configuration - FORCE SPEAKER OUTPUT
      // Using videoChat mode + defaultSpeakerOutput option for guaranteed speaker
      console.log('[AudioSession] Configuring iOS for SPEAKER output...');

      try {
        // Primary config: videoChat mode with defaultSpeakerOutput
        await AudioSession.setAppleAudioConfiguration({
          audioCategory: 'playAndRecord',
          audioCategoryOptions: [
            'allowBluetooth',
            'mixWithOthers',
            'defaultToSpeaker',  // KEY: Forces speaker as default output
          ],
          audioMode: 'videoChat',  // videoChat mode uses speaker by default
        });
        console.log('[AudioSession] iOS videoChat + defaultToSpeaker configured!');
      } catch (err) {
        console.warn('[AudioSession] Primary iOS config failed, trying fallback:', err);
        // Fallback: just videoChat without defaultToSpeaker option
        await AudioSession.setAppleAudioConfiguration({
          audioCategory: 'playAndRecord',
          audioCategoryOptions: ['allowBluetooth', 'mixWithOthers'],
          audioMode: 'videoChat',
        });
      }

      console.log('[AudioSession] Starting iOS audio session...');
      await AudioSession.startAudioSession();

      // Additionally set default output to speaker (belt and suspenders)
      try {
        console.log('[AudioSession] Setting iOS default output to speaker...');
        await AudioSession.configureAudio({
          ios: {
            defaultOutput: 'speaker',
          },
        });
        console.log('[AudioSession] iOS speaker output set!');
      } catch (outputErr) {
        console.warn('[AudioSession] Could not set speaker output:', outputErr);
      }
    } else if (Platform.OS === 'android') {
      // Android-specific configuration - FORCE SPEAKER OUTPUT
      // SOLUTION: Use 'inCommunication' for echo cancellation + forceHandleAudioRouting + explicit speaker selection
      console.log('[AudioSession] Configuring Android audio for SPEAKER with echo cancellation...');

      await AudioSession.configureAudio({
        android: {
          // Force speaker as preferred output
          preferredOutputList: ['speaker'],
          // CRITICAL: This flag forces audio routing even in communication mode
          forceHandleAudioRouting: true,
          audioTypeOptions: {
            manageAudioFocus: true,
            // Use 'inCommunication' for echo cancellation (important for voice calls!)
            audioMode: 'inCommunication',
            audioFocusMode: 'gain',
            // Voice call stream type for proper routing
            audioStreamType: 'voiceCall',
            audioAttributesUsageType: 'voiceCommunication',
            audioAttributesContentType: 'speech',
          },
        },
      });

      console.log('[AudioSession] Starting Android audio session...');
      await AudioSession.startAudioSession();

      // CRITICAL: Explicitly select speaker AFTER session starts
      // This overrides the default earpiece routing of inCommunication mode
      try {
        console.log('[AudioSession] Explicitly selecting speaker output...');
        await AudioSession.selectAudioOutput('speaker');
        console.log('[AudioSession] Speaker output explicitly selected!');
      } catch (speakerErr) {
        console.warn('[AudioSession] selectAudioOutput failed, trying showAudioRoutePicker:', speakerErr);
        // Fallback: try to show audio route picker or use alternative method
        try {
          if (AudioSession.showAudioRoutePicker) {
            await AudioSession.showAudioRoutePicker();
          }
        } catch (pickerErr) {
          console.warn('[AudioSession] showAudioRoutePicker also failed:', pickerErr);
        }
      }

      console.log('[AudioSession] Android speaker mode with echo cancellation configured!');
    }

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

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

  console.log(`[AudioSession] Stopping audio session on ${Platform.OS}...`);

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

  console.log(`[AudioSession] Reconfiguring for playback (SPEAKER) on ${Platform.OS}...`);

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

    if (Platform.OS === 'ios') {
      // Reconfigure iOS - force speaker output
      await AudioSession.setAppleAudioConfiguration({
        audioCategory: 'playAndRecord',
        audioCategoryOptions: [
          'allowBluetooth',
          'mixWithOthers',
          'defaultToSpeaker',  // Force speaker
        ],
        audioMode: 'videoChat',  // videoChat = speaker by default
      });

      // Also set default output to speaker
      await AudioSession.configureAudio({
        ios: {
          defaultOutput: 'speaker',
        },
      });
      console.log('[AudioSession] iOS reconfigured for speaker playback');
    } else if (Platform.OS === 'android') {
      // Reconfigure Android - force speaker while keeping echo cancellation
      await AudioSession.configureAudio({
        android: {
          preferredOutputList: ['speaker'],
          forceHandleAudioRouting: true,
          audioTypeOptions: {
            manageAudioFocus: true,
            audioMode: 'inCommunication',  // Keep for echo cancellation
            audioFocusMode: 'gain',
            audioStreamType: 'voiceCall',
            audioAttributesUsageType: 'voiceCommunication',
            audioAttributesContentType: 'speech',
          },
        },
      });

      // Explicitly select speaker output
      try {
        await AudioSession.selectAudioOutput('speaker');
        console.log('[AudioSession] Android speaker explicitly selected');
      } catch (err) {
        console.warn('[AudioSession] selectAudioOutput failed in reconfigure:', err);
      }

      console.log('[AudioSession] Android reconfigured for speaker playback');
    }

    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 (iOS + Android)
 *
 * @param useSpeaker - true for speaker, false for earpiece
 */
export async function setAudioOutput(useSpeaker: boolean): Promise<void> {
  console.log(`[AudioSession] Setting audio output to ${useSpeaker ? 'SPEAKER' : 'EARPIECE'} on ${Platform.OS}...`);

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

    if (Platform.OS === 'ios') {
      // iOS: Use videoChat mode + defaultToSpeaker for speaker, voiceChat for earpiece
      await AudioSession.setAppleAudioConfiguration({
        audioCategory: 'playAndRecord',
        audioCategoryOptions: useSpeaker
          ? ['allowBluetooth', 'mixWithOthers', 'defaultToSpeaker']
          : ['allowBluetooth', 'mixWithOthers'],
        audioMode: useSpeaker ? 'videoChat' : 'voiceChat',
      });

      // Also set default output
      await AudioSession.configureAudio({
        ios: {
          defaultOutput: useSpeaker ? 'speaker' : 'earpiece',
        },
      });
    } else if (Platform.OS === 'android') {
      // Android: Keep inCommunication mode for echo cancellation, use explicit output selection
      await AudioSession.configureAudio({
        android: {
          preferredOutputList: useSpeaker ? ['speaker'] : ['earpiece'],
          forceHandleAudioRouting: true,
          audioTypeOptions: {
            manageAudioFocus: true,
            // Always use inCommunication for echo cancellation
            audioMode: 'inCommunication',
            audioFocusMode: 'gain',
            audioStreamType: 'voiceCall',
            audioAttributesUsageType: 'voiceCommunication',
            audioAttributesContentType: 'speech',
          },
        },
      });

      // Explicitly select output device
      try {
        await AudioSession.selectAudioOutput(useSpeaker ? 'speaker' : 'earpiece');
      } catch (err) {
        console.warn('[AudioSession] selectAudioOutput failed:', err);
      }
    }

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