/**
 * 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 with fallback strategies
      // Try multiple configurations in order of preference

      const configs = [
        // Strategy 1: videoChat mode (speaker by default, no problematic options)
        {
          name: 'videoChat',
          config: {
            audioCategory: 'playAndRecord',
            audioCategoryOptions: ['allowBluetooth', 'mixWithOthers'],
            audioMode: 'videoChat',
          },
        },
        // Strategy 2: voiceChat mode (more compatible, but earpiece by default)
        {
          name: 'voiceChat',
          config: {
            audioCategory: 'playAndRecord',
            audioCategoryOptions: ['allowBluetooth', 'mixWithOthers'],
            audioMode: 'voiceChat',
          },
        },
        // Strategy 3: Minimal config (most compatible)
        {
          name: 'minimal',
          config: {
            audioCategory: 'playAndRecord',
            audioCategoryOptions: [],
            audioMode: 'default',
          },
        },
      ];

      let configSuccess = false;
      let lastError: any = null;

      for (const { name, config } of configs) {
        try {
          console.log(`[AudioSession] Trying ${name} configuration...`);
          await AudioSession.setAppleAudioConfiguration(config);
          console.log(`[AudioSession] ${name} configuration succeeded!`);
          configSuccess = true;
          break;
        } catch (err) {
          console.warn(`[AudioSession] ${name} config failed:`, err);
          lastError = err;
          // Continue to next strategy
        }
      }

      if (!configSuccess) {
        console.error('[AudioSession] All iOS configurations failed!');
        throw lastError || new Error('All audio configurations failed');
      }

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

      // Try to set speaker output (non-critical, don't throw on failure)
      try {
        console.log('[AudioSession] Setting default output to speaker...');
        await AudioSession.configureAudio({
          ios: {
            defaultOutput: 'speaker',
          },
        });
      } catch (outputErr) {
        console.warn('[AudioSession] Could not set speaker output:', outputErr);
        // Continue anyway - audio will work, just maybe on earpiece
      }
    } else if (Platform.OS === 'android') {
      // Android-specific configuration
      // IMPORTANT: Using 'music' stream type to force output to speaker
      // 'voiceCall' stream type defaults to earpiece on many Android devices
      console.log('[AudioSession] Configuring Android audio for SPEAKER...');
      await AudioSession.configureAudio({
        android: {
          // Use MEDIA mode to ensure speaker output
          audioTypeOptions: {
            manageAudioFocus: true,
            audioMode: 'normal',
            audioFocusMode: 'gain',
            // Use 'music' stream - goes to speaker by default
            audioStreamType: 'music',
            audioAttributesUsageType: 'media',
            audioAttributesContentType: 'music',
          },
          // Force speaker as output
          preferredOutputList: ['speaker'],
          // Allow us to control audio routing
          forceHandleAudioRouting: true,
        },
      });

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

    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 on ${Platform.OS}...`);

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

    if (Platform.OS === 'ios') {
      // Reconfigure with same safe settings - this "refreshes" the audio routing
      await AudioSession.setAppleAudioConfiguration({
        audioCategory: 'playAndRecord',
        audioCategoryOptions: [
          'allowBluetooth',
          'mixWithOthers',
        ],
        // Use 'videoChat' - defaults to speaker
        audioMode: 'videoChat',
      });
    } else if (Platform.OS === 'android') {
      // Reconfigure Android audio to ensure speaker output
      // Using 'music' stream type to force speaker
      await AudioSession.configureAudio({
        android: {
          audioTypeOptions: {
            manageAudioFocus: true,
            audioMode: 'normal',
            audioFocusMode: 'gain',
            audioStreamType: 'music',
            audioAttributesUsageType: 'media',
            audioAttributesContentType: 'music',
          },
          preferredOutputList: ['speaker'],
          forceHandleAudioRouting: true,
        },
      });
    }

    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: Update configuration based on desired output
      // Use 'videoChat' mode for speaker, 'voiceChat' for earpiece
      await AudioSession.setAppleAudioConfiguration({
        audioCategory: 'playAndRecord',
        audioCategoryOptions: ['allowBluetooth', 'mixWithOthers'],
        audioMode: useSpeaker ? 'videoChat' : 'voiceChat',
      });

      // Also set default output
      await AudioSession.configureAudio({
        ios: {
          defaultOutput: useSpeaker ? 'speaker' : 'earpiece',
        },
      });
    } else if (Platform.OS === 'android') {
      // Android: Switch stream type to control speaker/earpiece
      // - 'music' stream goes to speaker by default
      // - 'voiceCall' stream goes to earpiece by default
      await AudioSession.configureAudio({
        android: {
          audioTypeOptions: {
            manageAudioFocus: true,
            audioMode: useSpeaker ? 'normal' : 'inCommunication',
            audioFocusMode: 'gain',
            // Key difference: music→speaker, voiceCall→earpiece
            audioStreamType: useSpeaker ? 'music' : 'voiceCall',
            audioAttributesUsageType: useSpeaker ? 'media' : 'voiceCommunication',
            audioAttributesContentType: useSpeaker ? 'music' : 'speech',
          },
          // Also set preferred output list
          preferredOutputList: useSpeaker ? ['speaker'] : ['earpiece'],
          forceHandleAudioRouting: true,
        },
      });
    }

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