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/**
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* 早安电台 — 音频管理器
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* 封装 wx.getBackgroundAudioManager()，管理全局背景播放
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* 确保小程序切后台后音频不断
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* 播放时自动上报收听历史
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*/
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const api = require('./api')
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let bgAudioManager = null
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let appInstance = null
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let _switching = false // 切换音频时的锁，防止 onStop 事件干扰
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/**
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* 初始化音频管理器
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* @param {Object} app - App 实例
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*/
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function init(app) {
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appInstance = app
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bgAudioManager = wx.getBackgroundAudioManager()
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// 绑定音频事件
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bgAudioManager.onPlay(() => {
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_switching = false // 新音频开始播放，释放锁
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updatePlayState(true)
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})
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bgAudioManager.onPause(() => {
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updatePlayState(false)
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// 暂停时上报进度
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reportHistory()
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})
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bgAudioManager.onStop(() => {
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// 如果正在切换音频，不处理 onStop（新的 src 设置会触发旧的 onStop）
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if (_switching) return
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reportHistory()
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updatePlayState(false)
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appInstance.globalData.currentTime = 0
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appInstance.emit('playerStateChange', getState())
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})
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bgAudioManager.onEnded(() => {
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reportHistory()
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updatePlayState(false)
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appInstance.globalData.currentTime = appInstance.globalData.duration
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appInstance.emit('playerStateChange', getState())
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})
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// 进度更新回调
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bgAudioManager.onTimeUpdate(() => {
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if (_switching) return
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const ct = Math.floor(bgAudioManager.currentTime || 0)
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const dur = Math.floor(bgAudioManager.duration || 0)
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appInstance.globalData.currentTime = ct
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if (dur > 0) {
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appInstance.globalData.duration = dur
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}
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appInstance.emit('timeUpdate', { currentTime: ct, duration: dur })
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})
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bgAudioManager.onError((err) => {
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console.error('[AudioManager] 播放出错：', err)
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_switching = false
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updatePlayState(false)
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})
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bgAudioManager.onWaiting(() => {
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console.log('[AudioManager] 缓冲中...')
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})
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}
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/**
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* 更新播放状态并通知
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*/
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function updatePlayState(isPlaying) {
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appInstance.globalData.isPlaying = isPlaying
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appInstance.emit('playerStateChange', getState())
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}
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/**
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* 获取当前播放器状态
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*/
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function getState() {
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return {
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activeContent: appInstance.globalData.activeContent,
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isPlaying: appInstance.globalData.isPlaying,
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currentTime: appInstance.globalData.currentTime,
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duration: appInstance.globalData.duration,
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playbackRate: appInstance.globalData.playbackRate
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}
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}
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/**
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* 获取音频 URL
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*/
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function getAudioUrl(content) {
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if (!content) return ''
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if (content.audio && content.audio.url) return content.audio.url
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if (content.audioUrl) return content.audioUrl
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return ''
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}
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/**
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* 上报收听历史到后端
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*/
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function reportHistory() {
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const content = appInstance.globalData.activeContent
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if (!content || !content.id) return
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api.addHistory({
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programId: content.id,
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progress: appInstance.globalData.currentTime || 0,
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duration: appInstance.globalData.duration || content.duration || 0
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}).catch(function (err) {
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console.warn('[AudioManager] 上报历史失败:', err)
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})
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}
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/**
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* 播放指定内容
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* @param {Object} content - 音频内容对象 { id, title, duration, audioUrl/audio.url, ... }
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*/
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function playContent(content) {
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if (!bgAudioManager || !content) return
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var audioUrl = getAudioUrl(content)
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if (!audioUrl) {
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console.error('[AudioManager] 音频内容缺少 audioUrl:', content)
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wx.showToast({ title: '音频地址无效', icon: 'none' })
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return
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}
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// 如果当前有播放内容，先上报历史
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var oldContent = appInstance.globalData.activeContent
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if (oldContent && oldContent.id && oldContent.id !== content.id) {
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reportHistory()
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}
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// 标记正在切换，防止旧音频的 onStop 干扰
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_switching = true
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appInstance.globalData.activeContent = content
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appInstance.globalData.currentTime = 0
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appInstance.globalData.duration = content.duration || 0
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// 设置背景音频属性（必须设置 title，否则 iOS 上不允许播放）
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bgAudioManager.title = content.title || '早安电台'
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bgAudioManager.singer = '早安电台'
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bgAudioManager.epname = content.title || '早安电台'
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bgAudioManager.coverImgUrl = (content.cover && content.cover.url) || content.coverUrl || ''
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// 设置音频源（这会触发旧音频的 onStop，然后自动开始播放新音频）
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bgAudioManager.src = audioUrl
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appInstance.emit('playerStateChange', getState())
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}
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/**
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* 切换播放/暂停
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* 关键：如果音频已结束或 src 被回收，需要重新设置 src 才能恢复播放
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*/
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function togglePlay() {
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if (!bgAudioManager || !appInstance.globalData.activeContent) return
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if (appInstance.globalData.isPlaying) {
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bgAudioManager.pause()
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} else {
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// 检查 bgAudioManager 是否还有有效的 src
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// 音频结束/被系统回收后，src 会变为空，此时 play() 无效
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// 需要重新设置 src 来恢复播放
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var currentSrc = ''
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try {
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currentSrc = bgAudioManager.src
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} catch (e) {
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currentSrc = ''
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}
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if (!currentSrc) {
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// src 已被清空（音频结束、系统回收等），重新播放
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playContent(appInstance.globalData.activeContent)
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} else {
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bgAudioManager.play()
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}
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}
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}
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/**
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* 跳转到指定时间（秒）
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*/
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function seekTo(time) {
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if (!bgAudioManager) return
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bgAudioManager.seek(time)
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appInstance.globalData.currentTime = time
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appInstance.emit('timeUpdate', {
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currentTime: time,
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duration: appInstance.globalData.duration
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})
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}
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/**
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* 设置播放速率
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* @param {number} rate - 0.5 / 0.75 / 1.0 / 1.25 / 1.5 / 2.0
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*/
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function setPlaybackRate(rate) {
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if (!bgAudioManager) return
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bgAudioManager.playbackRate = rate
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appInstance.globalData.playbackRate = rate
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appInstance.emit('playerStateChange', getState())
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}
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module.exports = {
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init,
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getState,
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playContent,
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togglePlay,
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seekTo,
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setPlaybackRate
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}
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