// utils/AudioManager.js - 音频管理器（微信小程序原生）

class AudioManager {
  constructor() {
    this.bgmContext = null;
    this.sfxContexts = new Map();
    this.voiceContext = null;
    this.isMuted = false;
    this.currentBGM = null;
  }

  /**
   * 初始化音频上下文
   */
  init() {
    // BGM 音频上下文
    this.bgmContext = wx.createInnerAudioContext();
    this.bgmContext.loop = true;
    this.bgmContext.autoplay = false;
    
    // 语音音频上下文
    this.voiceContext = wx.createInnerAudioContext();
    this.voiceContext.loop = false;
    this.voiceContext.autoplay = false;
    
    console.log('[AudioManager] 初始化完成');
  }

  /**
   * 播放背景音乐
   * @param {string} src - 音频文件路径
   */
  playBGM(src) {
    if (this.isMuted) return;
    
    if (this.currentBGM === src && !this.bgmContext.paused) {
      return; // 已经在播放相同的BGM
    }
    
    this.stopBGM();
    
    this.bgmContext.src = src;
    this.bgmContext.play();
    this.currentBGM = src;
    
    console.log('[AudioManager] 播放BGM:', src);
  }

  /**
   * 停止背景音乐
   */
  stopBGM() {
    if (this.bgmContext) {
      this.bgmContext.stop();
      this.currentBGM = null;
    }
  }

  /**
   * 播放音效
   * @param {string} type - 音效类型
   */
  playSFX(type) {
    if (this.isMuted) return;
    
    const sfxMap = {
      'drop': '/audio/sfx_drop.mp3',
      'merge': '/audio/sfx_merge.mp3',
      'combo2': '/audio/sfx_combo2.mp3',
      'combo3': '/audio/sfx_combo3.mp3',
      'combo4': '/audio/sfx_combo4.mp3',
      'combo5': '/audio/sfx_combo5.mp3',
      'golden': '/audio/sfx_golden.mp3',
      'clear': '/audio/sfx_clear.mp3',
      'gameover': '/audio/sfx_gameover.mp3',
      'revive': '/audio/sfx_revive.mp3'
    };
    
    const src = sfxMap[type];
    if (!src) {
      console.warn('[AudioManager] 未知音效类型:', type);
      return;
    }
    
    // 复用或创建音效上下文
    let context = this.sfxContexts.get(type);
    if (!context) {
      context = wx.createInnerAudioContext();
      context.loop = false;
      context.autoplay = false;
      this.sfxContexts.set(type, context);
    }
    
    context.src = src;
    context.play();
    
    console.log('[AudioManager] 播放音效:', type);
  }

  /**
   * 播放语音
   * @param {string} src - 语音文件路径
   */
  playVoice(src) {
    if (this.isMuted) return;
    
    this.stopVoice();
    
    this.voiceContext.src = src;
    this.voiceContext.play();
    
    console.log('[AudioManager] 播放语音:', src);
  }

  /**
   * 停止语音
   */
  stopVoice() {
    if (this.voiceContext) {
      this.voiceContext.stop();
    }
  }

  /**
   * 静音/取消静音
   */
  setMute(muted) {
    this.isMuted = muted;
    
    if (muted) {
      this.stopBGM();
      this.stopVoice();
      
      // 停止所有音效
      for (const context of this.sfxContexts.values()) {
        context.stop();
      }
    } else {
      // 恢复BGM
      if (this.currentBGM) {
        this.bgmContext.play();
      }
    }
    
    console.log('[AudioManager] 静音:', muted);
  }

  /**
   * 销毁所有音频资源
   */
  destroy() {
    if (this.bgmContext) {
      this.bgmContext.destroy();
    }
    
    if (this.voiceContext) {
      this.voiceContext.destroy();
    }
    
    for (const context of this.sfxContexts.values()) {
      context.destroy();
    }
    
    this.sfxContexts.clear();
    
    console.log('[AudioManager] 资源已销毁');
  }
}

// 单例导出
const audioManager = new AudioManager();
module.exports = audioManager;