/**
 * OmniCard AI (CRMmp) - 移动微官网双语发音语音条与多媒体播放器业务驱动层
 * 遵循 uts 强类型规范与 AGENTS.md 约束，杜绝 any，无 emoji
 */

export type AudioPlayerState = {
  isPlaying: boolean;
  currentDuration: number;
  currentTime: number;
  waveformActive: boolean;
  currentUrl: string;
  errorMessage: string;
};

export type AudioErrorEvent = {
  errMsg?: string;
  errCode?: number;
};

export type InnerAudioPlayerLike = {
  src: string;
  duration?: number;
  currentTime?: number;
  paused?: boolean;
  play: () => void;
  pause?: () => void;
  stop: () => void;
  destroy: () => void;
  onPlay: (cb: () => void) => void;
  onEnded: (cb: () => void) => void;
  onError: (cb: (err: AudioErrorEvent) => void) => void;
  onTimeUpdate?: (cb: () => void) => void;
};

type UniAudioRuntime = {
  createInnerAudioContext?: () => InnerAudioPlayerLike;
};

let singletonAudioContext: InnerAudioPlayerLike | null = null;
let activePlayerState: AudioPlayerState | null = null;

/**
 * 创建发音播放器初始状态
 */
export function createAudioPlayerState(): AudioPlayerState {
  return {
    isPlaying: false,
    currentDuration: 0,
    currentTime: 0,
    waveformActive: false,
    currentUrl: '',
    errorMessage: '',
  };
}

/**
 * 获取或初始化单例音频实例
 */
function getOrCreateAudioContext(state: AudioPlayerState): InnerAudioPlayerLike | null {
  activePlayerState = state;
  if (singletonAudioContext != null) {
    return singletonAudioContext;
  }

  const runtime = uni as unknown as UniAudioRuntime;
  if (typeof runtime.createInnerAudioContext !== 'function') {
    state.errorMessage = '当前环境不支持音频播放';
    return null;
  }

  const ctx = runtime.createInnerAudioContext();
  ctx.onPlay(() => {
    if (activePlayerState != null) {
      activePlayerState!.isPlaying = true;
      activePlayerState!.waveformActive = true;
      activePlayerState!.errorMessage = '';
    }
  });

  ctx.onEnded(() => {
    if (activePlayerState != null) {
      activePlayerState!.isPlaying = false;
      activePlayerState!.waveformActive = false;
      activePlayerState!.currentTime = 0;
    }
  });

  ctx.onError((err: AudioErrorEvent) => {
    if (activePlayerState != null) {
      activePlayerState!.isPlaying = false;
      activePlayerState!.waveformActive = false;
      activePlayerState!.errorMessage = err.errMsg != null ? err.errMsg! : '音频播放失败';
    }
  });

  if (typeof ctx.onTimeUpdate === 'function') {
    ctx.onTimeUpdate(() => {
      if (activePlayerState != null) {
        if (typeof ctx.currentTime === 'number') {
          activePlayerState!.currentTime = ctx.currentTime!;
        }
        if (typeof ctx.duration === 'number') {
          activePlayerState!.currentDuration = ctx.duration!;
        }
      }
    });
  }

  singletonAudioContext = ctx;
  return singletonAudioContext;
}

/**
 * 播放指定音频链接
 */
export function playAudio(state: AudioPlayerState, audioUrl: string): boolean {
  if (audioUrl == null) {
    state.errorMessage = '音频链接不能为空';
    return false;
  }

  const trimmed = audioUrl.trim();
  if (trimmed === '') {
    state.errorMessage = '音频链接不能为空';
    return false;
  }

  const ctx = getOrCreateAudioContext(state);
  if (ctx == null) {
    return false;
  }

  try {
    // 若当前正在播放不同音频，先停止当前音频
    if (state.isPlaying && state.currentUrl !== trimmed) {
      try {
        ctx.stop();
      } catch (_e) {}
    }

    ctx.src = trimmed;
    ctx.play();
    state.currentUrl = trimmed;
    state.isPlaying = true;
    state.waveformActive = true;
    state.errorMessage = '';
    return true;
  } catch (err) {
    state.isPlaying = false;
    state.waveformActive = false;
    const msg = err instanceof Error ? err.message : '播放启动失败';
    state.errorMessage = msg;
    return false;
  }
}

/**
 * 停止当前播放
 */
export function stopAudio(state: AudioPlayerState): void {
  if (singletonAudioContext != null) {
    try {
      singletonAudioContext!.stop();
    } catch (_e) {}
  }
  state.isPlaying = false;
  state.waveformActive = false;
}

/**
 * 切换播放/停止
 */
export function toggleAudio(state: AudioPlayerState, audioUrl?: string): boolean {
  const targetUrl = audioUrl != null ? audioUrl.trim() : state.currentUrl;
  if (targetUrl === '') {
    return false;
  }

  if (state.isPlaying && (state.currentUrl === targetUrl || audioUrl == null)) {
    stopAudio(state);
    return false;
  }

  return playAudio(state, targetUrl);
}

/**
 * 单例音频实例销毁释放，杜绝内存泄漏
 */
export function releaseAudioPlayer(state?: AudioPlayerState): void {
  if (singletonAudioContext != null) {
    try {
      singletonAudioContext!.stop();
    } catch (_e) {}
    try {
      singletonAudioContext!.destroy();
    } catch (_e) {}
    singletonAudioContext = null;
  }
  activePlayerState = null;

  if (state != null) {
    state.isPlaying = false;
    state.waveformActive = false;
    state.currentTime = 0;
    state.currentDuration = 0;
    state.currentUrl = '';
  }
}