export const DEFAULT_RUNTIME_CLICK_SOUND_SRC = '/audio/ui-click-soft.wav';
export const DEFAULT_RUNTIME_LEVEL_CLEAR_SOUND_SRC =
  '/audio/ui-level-clear.wav';
export const DEFAULT_RUNTIME_MERGE_SOUND_SRC =
  DEFAULT_RUNTIME_LEVEL_CLEAR_SOUND_SRC;
export const DEFAULT_RUNTIME_COUNTDOWN_SOUND_SRC =
  '/audio/ui-countdown-warning.wav';
export const DEFAULT_RUNTIME_COUNTDOWN_WARNING_THRESHOLD_MS = 5_000;

export const DEFAULT_RUNTIME_LEVEL_AUDIO_CONFIG = {
  clickSoundSrc: DEFAULT_RUNTIME_CLICK_SOUND_SRC,
  levelClearSoundSrc: DEFAULT_RUNTIME_LEVEL_CLEAR_SOUND_SRC,
  countdownSoundSrc: DEFAULT_RUNTIME_COUNTDOWN_SOUND_SRC,
  countdownWarningThresholdMs: DEFAULT_RUNTIME_COUNTDOWN_WARNING_THRESHOLD_MS,
} as const;

const runtimeAudioCache = new Map<string, HTMLAudioElement>();

function clampRuntimeAudioVolume(value: number) {
  if (!Number.isFinite(value)) {
    return 0.6;
  }
  return Math.max(0, Math.min(1, value));
}

export function playRuntimeClickSound(
  source = DEFAULT_RUNTIME_CLICK_SOUND_SRC,
  volume = 0.6,
) {
  if (import.meta.env.MODE === 'test' || typeof Audio === 'undefined') {
    return;
  }

  const normalizedSource = source.trim();
  if (!normalizedSource) {
    return;
  }

  const audio =
    runtimeAudioCache.get(normalizedSource) ?? new Audio(normalizedSource);
  runtimeAudioCache.set(normalizedSource, audio);
  audio.currentTime = 0;
  audio.volume = clampRuntimeAudioVolume(volume);
  try {
    const playResult = audio.play();
    void playResult?.catch?.(() => {
      // 中文注释：浏览器可能在用户手势外拒绝播放，点击反馈不应中断主交互。
    });
  } catch {
    // 中文注释：测试环境或极端浏览器可能未实现 play，同样不能影响主交互。
  }
}

export function playRuntimeLevelClearSound(volume = 0.6) {
  playRuntimeClickSound(DEFAULT_RUNTIME_LEVEL_CLEAR_SOUND_SRC, volume);
}

export function playRuntimeMergeSound(volume = 0.6) {
  playRuntimeClickSound(DEFAULT_RUNTIME_MERGE_SOUND_SRC, volume);
}

export function playRuntimeCountdownSound(volume = 0.6) {
  playRuntimeClickSound(DEFAULT_RUNTIME_COUNTDOWN_SOUND_SRC, volume);
}

export function resolveRuntimeCountdownSecondBucket(remainingMs: number) {
  if (
    !Number.isFinite(remainingMs) ||
    remainingMs <= 0 ||
    remainingMs > DEFAULT_RUNTIME_COUNTDOWN_WARNING_THRESHOLD_MS
  ) {
    return null;
  }
  return Math.max(1, Math.ceil(remainingMs / 1000));
}