export default {
  player: null,
  isApp: uni.getSystemInfoSync().platform === 'ios' || uni.getSystemInfoSync().platform === 'android',
  
  initPlayer() {
    if (!this.player) {
      this.player = uni.createInnerAudioContext()
      this.player.obeyMuteSwitch = false
    }
    return this.player
  },

  // 提取音频信息
  extractAudioInfo(wordData) {
    const audioInfo = {
      main: null,
      syllables: [],
      frequencies: []
    }
    
    if (wordData.yinpin) {
      audioInfo.main = {
        id: `word_${wordData.id}_main`,
        url: wordData.yinpin,
        type: 'main',
        text: wordData.name
      }
    }
    
    if (wordData.yinjie?.length) {
      audioInfo.syllables = wordData.yinjie.map((item, index) => ({
        id: `word_${wordData.id}_syllable_${index}`,
        url: item.yinpin,
        type: 'syllable',
        text: item.cigen,
        index
      })).filter(item => item.url)
    }
    
    if (wordData.pindu?.length) {
      audioInfo.frequencies = wordData.pindu.map((item, index) => ({
        id: `word_${wordData.id}_frequency_${index}`,
        url: item.yinpin,
        type: 'frequency',
        text: item.cigen,
        index
      })).filter(item => item.url)
    }
    
    return audioInfo
  },

  // 缓存单词的所有音频
  async cacheWordAudios(wordData) {
    try {
      const { main, syllables, frequencies } = this.extractAudioInfo(wordData)
      const allAudios = []
      
      if (main) allAudios.push(main)
      allAudios.push(...syllables)
      allAudios.push(...frequencies)
      
      // App环境才进行真实下载
      if (this.isApp) {
        await this.downloadAndSaveAudios(allAudios)
      }
      
      this.saveAudioInfoToStorage(wordData.id, { main, syllables, frequencies })
      return true
    } catch (error) {
      console.error('音频缓存失败:', error)
      return false
    }
  },

  // 下载并保存音频（仅App环境）
  async downloadAndSaveAudios(audioList) {
    const downloadPromises = audioList.map(audio => {
      return new Promise((resolve, reject) => {
        // 先检查是否已缓存
        const cachedPath = uni.getStorageSync(`audio_file_${audio.id}`)
        if (cachedPath) return resolve()
        
        uni.downloadFile({
          url: audio.url,
          success: (res) => {
            if (res.statusCode === 200) {
              uni.setStorageSync(`audio_file_${audio.id}`, res.tempFilePath)
              resolve()
            } else {
              reject(new Error(`下载失败，状态码: ${res.statusCode}`))
            }
          },
          fail: reject
        })
      }).catch(e => {
        console.warn(`音频 ${audio.id} 预加载失败:`, e)
        // 即使下载失败也继续其他下载
      })
    })
    
    await Promise.all(downloadPromises)
  },

  // 播放音频（优先本地，失败后回退网络）
  playAudio(audioInfo) {
    if (!audioInfo?.url) return
    
    const player = this.initPlayer()
    player.stop()
    
    // 在App环境尝试使用本地缓存
    if (this.isApp) {
      const cachedPath = uni.getStorageSync(`audio_file_${audioInfo.id}`)
      if (cachedPath) {
        player.src = cachedPath
        player.play()
        return player
      }
    }
    
    // 非App环境或缓存失败时使用网络
    console.warn(`使用网络音频: ${audioInfo.id}`)
    player.src = audioInfo.url
    player.play()
    
    // App环境下后台继续尝试缓存
    if (this.isApp) {
      this.downloadAndSaveAudios([audioInfo]).catch(console.error)
    }
    
    player.onError((err) => {
      console.error('播放失败:', err)
      uni.showToast({ title: '播放失败', icon: 'none' })
    })
    
    return player
  },

  // 其他方法保持不变...
  saveAudioInfoToStorage(wordId, audioInfo) {
    const cacheKey = `word_audio_${wordId}`
    uni.setStorageSync(cacheKey, {
      timestamp: Date.now(),
      ...audioInfo
    })
  },

  getAudioInfoFromStorage(wordId) {
    const cacheKey = `word_audio_${wordId}`
    return uni.getStorageSync(cacheKey) || null
  },

  clearWordCache(wordId) {
    uni.removeStorageSync(`word_audio_${wordId}`)
    const prefix = `word_${wordId}_`
    const keys = uni.getStorageInfoSync().keys
    keys.filter(key => key.startsWith('audio_file_') && key.includes(prefix))
      .forEach(key => uni.removeStorageSync(key))
  }
}