import { AudioManager } from './AudioManager';
import type { GameSettings } from '@token-empire/shared';
import { useGameStore } from '@/store';

export { AudioManager } from './AudioManager';
export { triggerNotificationSound, playUISound } from './sounds';
export type { SoundId } from './synthesizer';

function applyVolumes(audio: AudioManager, settings: GameSettings): void {
  audio.setSoundEnabled(settings.soundEnabled);
  audio.setMusicVolume(settings.musicVolume);
  audio.setSfxVolume(settings.sfxVolume ?? 0.5);
}

function shouldPlayMusic(settings: GameSettings): boolean {
  return settings.soundEnabled && settings.musicVolume > 0;
}

export function initAudioSystem(): () => void {
  const audio = AudioManager.getInstance();
  let gestureListenerActive = false;

  const settings = useGameStore.getState().meta.settings;
  applyVolumes(audio, settings);

  // Music requires a user gesture to start (browser autoplay policy).
  // We register a one-shot listener that starts music on first click/key.
  const startOnGesture = () => {
    const s = useGameStore.getState().meta.settings;
    if (shouldPlayMusic(s)) {
      audio.startMusic();
    }
    document.removeEventListener('click', startOnGesture);
    document.removeEventListener('keydown', startOnGesture);
    gestureListenerActive = false;
  };

  if (shouldPlayMusic(settings)) {
    document.addEventListener('click', startOnGesture);
    document.addEventListener('keydown', startOnGesture);
    gestureListenerActive = true;
  }

  const unsub = useGameStore.subscribe((state) => {
    const next = state.meta.settings;
    applyVolumes(audio, next);

    if (shouldPlayMusic(next)) {
      if (!audio.isMusicPlaying) {
        if (audio.isContextActive) {
          audio.startMusic();
        } else if (!gestureListenerActive) {
          document.addEventListener('click', startOnGesture);
          document.addEventListener('keydown', startOnGesture);
          gestureListenerActive = true;
        }
      }
    } else {
      audio.stopMusic();
    }
  });

  return () => {
    unsub();
    document.removeEventListener('click', startOnGesture);
    document.removeEventListener('keydown', startOnGesture);
    audio.dispose();
  };
}