/**
 * Wake Word Service — "ARIA" Erkennung
 *
 * Phase 1: Deaktiviert — react-native-live-audio-stream hat native Bridge-Probleme.
 * Nutzt stattdessen Tap-to-Talk (VoiceButton) als primaeren Eingabemodus.
 *
 * Phase 2: Porcupine on-device "ARIA" Keyword (geplant).
 */

type WakeWordCallback = () => void;
type StateCallback = (state: WakeWordState) => void;

export type WakeWordState = 'off' | 'listening' | 'detected';

class WakeWordService {
  private state: WakeWordState = 'off';
  private wakeCallbacks: WakeWordCallback[] = [];
  private stateCallbacks: StateCallback[] = [];

  /** Wake Word Erkennung starten */
  async start(): Promise<boolean> {
    if (this.state === 'listening') return true;

    try {
      // Phase 1: LiveAudioStream deaktiviert (native Bridge instabil)
      // Stattdessen: Tap-to-Talk als primaerer Modus
      console.log('[WakeWord] Wake Word ist in Phase 1 noch nicht verfuegbar — nutze Tap-to-Talk');
      this.setState('listening');
      return true;
    } catch (err) {
      console.error('[WakeWord] Start fehlgeschlagen:', err);
      return false;
    }
  }

  /** Wake Word Erkennung stoppen */
  stop(): void {
    this.setState('off');
  }

  /** Nach Aufnahme erneut starten */
  async resume(): Promise<void> {
    // Nichts zu tun in Phase 1
  }

  // --- Callbacks ---

  onWakeWord(callback: WakeWordCallback): () => void {
    this.wakeCallbacks.push(callback);
    return () => {
      this.wakeCallbacks = this.wakeCallbacks.filter(cb => cb !== callback);
    };
  }

  onStateChange(callback: StateCallback): () => void {
    this.stateCallbacks.push(callback);
    return () => {
      this.stateCallbacks = this.stateCallbacks.filter(cb => cb !== callback);
    };
  }

  getState(): WakeWordState {
    return this.state;
  }

  private setState(state: WakeWordState): void {
    if (this.state !== state) {
      this.state = state;
      this.stateCallbacks.forEach(cb => cb(state));
    }
  }
}

const wakeWordService = new WakeWordService();
export default wakeWordService;