<div class="right di main-wrap" v-loading="audio.waiting">
   <!-- 此处的ref属性，可以很方便的在vue组件中通过 this.$refs.audio获取该dom元素 -->
   <audio ref="audio" class="dn"
   :src="url" :preload="audio.preload"
   @play="onPlay"
   @error="onError"
   @waiting="onWaiting"
   @pause="onPause"
   @timeupdate="onTimeupdate"
   @loadedmetadata="onLoadedmetadata"
   ></audio>

   <div class="w-full">
     <div class="flex items-center w-10/12 mx-auto">
       <!-- 当前时间 -->
       <el-tag type="info">{{ audio.currentTime | formatSecond}}</el-tag>

       <!-- 滚动条 -->
       <el-slider v-show="!controlList.noProcess" v-model="sliderTime" :format-tooltip="formatProcessToolTip" @change="changeCurrentTime" class="slider_time"></el-slider>
       <!-- 总时长 -->
       <el-tag type="info">{{ audio.maxTime | formatSecond }}</el-tag>
     </div>
     <div class="mt-3 flex items-center w-1/2 mx-auto justify-around">
       <!-- 播放/暂停 -->
       <el-button type="text" @click="startPlayOrPause">{{audio.playing | transPlayPause}}</el-button>
       <!-- 快进 -->
       <el-button v-show="!controlList.noSpeed" type="text" @click="changeSpeed">{{audio.speed | transSpeed}}</el-button>
       <!-- 静音 -->
       <el-button v-show="!controlList.noMuted" type="text" @click="startMutedOrNot">{{audio.muted | transMutedOrNot}}</el-button>
       <!-- 音量 -->
       <div class="flex items-center">
         <span class="mr-2 text-sm">音量</span>
         <el-slider v-show="!controlList.noVolume" v-model="volume" :format-tooltip="formatVolumeToolTip" @change="changeVolume" class="slider_voice"></el-slider>
       </div>

       <!-- 下载 -->
       <a :href="url" rel="external nofollow"  v-show="!controlList.noDownload" target="_blank" class="download text-sm" download>下载</a>
     </div>
   </div>
 </div>

<script>
  // 将整数转换成 时：分：秒的格式
  function realFormatSecond(second) {
    var secondType = typeof second

    if (secondType === 'number' || secondType === 'string') {
      second = parseInt(second)

      var hours = Math.floor(second / 3600)
      second = second - hours * 3600
      var mimute = Math.floor(second / 60)
      second = second - mimute * 60

      return hours + ':' + ('0' + mimute).slice(-2) + ':' + ('0' + second).slice(-2)
    } else {
      return '0:00:00'
    }
  }

  export default {
    name: 'voicetotext',
    props: {
      theSpeeds: {
        type: Array,
        default () {
          return [1, 1.5, 2]
        }
      },
      theControlList: {
        type: String,
        default: ''
      }
    },
    data(){
      return{
        url: 'https://wdd.js.org/element-audio/static/falling-star.mp3',
        audio: {
          currentTime: 0,
          maxTime: 0,
          playing: false,
          muted: false,
          speed: 1,
          waiting: true,
          preload: 'auto'
        },

        sliderTime: 0,
        volume: 100,
        speeds: this.theSpeeds,

        controlList: {
          // 不显示下载
          noDownload: false,
          // 不显示静音
          noMuted: false,
          // 不显示音量条
          noVolume: false,
          // 不显示进度条
          noProcess: false,
          // 只能播放一个
          onlyOnePlaying: false,
          // 不要快进按钮
          noSpeed: false
        }
      }
    },
    methods:{
      setControlList () {
        let controlList = this.theControlList.split(' ')
        controlList.forEach((item) => {
          if(this.controlList[item] !== undefined){
            this.controlList[item] = true
          }
        })
      },
      changeSpeed() {
        let index = this.speeds.indexOf(this.audio.speed) + 1
        this.audio.speed = this.speeds[index % this.speeds.length]
        this.$refs.audio.playbackRate = this.audio.speed
      },
      startMutedOrNot() {
        this.$refs.audio.muted = !this.$refs.audio.muted
        this.audio.muted = this.$refs.audio.muted
      },
      // 音量条toolTip
      formatVolumeToolTip(index) {
        return '音量条: ' + index
      },
      // 进度条toolTip
      formatProcessToolTip(index = 0) {
        index = parseInt(this.audio.maxTime / 100 * index)
        return '进度条: ' + realFormatSecond(index)
      },
      // 音量改变
      changeVolume(index = 0) {
        this.$refs.audio.volume = index / 100
        this.volume = index
      },
      // 播放跳转
      changeCurrentTime(index) {
        this.pausePlay()
        this.$refs.audio.currentTime = parseInt(index / 100 * this.audio.maxTime)
      },
      startPlayOrPause() {
        return this.audio.playing ? this.pausePlay() : this.startPlay()
      },
      // 开始播放
      startPlay() {
        this.$refs.audio.play()
      },
      // 暂停
      pausePlay() {
        this.$refs.audio.pause()
      },
      // 当音频暂停
      onPause () {
        this.audio.playing = false
      },
      // 当发生错误, 就出现loading状态
      onError () {
        this.audio.waiting = true
      },
      // 当音频开始等待
      onWaiting (res) {
        console.log(res)
      },
      // 当音频开始播放
      onPlay (res) {
        console.log(res)
        this.audio.playing = true
        this.audio.loading = false

        if(!this.controlList.onlyOnePlaying){
          return
        }

        let target = res.target

        let audios = document.getElementsByTagName('audio');

        [...audios].forEach((item) => {
          if(item !== target){
            item.pause()
          }
        })
      },
      // 当timeupdate事件大概每秒一次，用来更新音频流的当前播放时间
      onTimeupdate(res) {
        // console.log('timeupdate')
        // console.log(res)
        this.audio.currentTime = res.target.currentTime
        this.sliderTime = parseInt(this.audio.currentTime / this.audio.maxTime * 100)
      },
      // 当加载语音流元数据完成后，会触发该事件的回调函数
      // 语音元数据主要是语音的长度之类的数据
      onLoadedmetadata(res) {
        this.audio.waiting = false
        this.audio.maxTime = parseInt(res.target.duration)
      }
    },
    filters: {
      formatSecond(second = 0) {
        return realFormatSecond(second)
      },
      transPlayPause(value) {
        return value ? '暂停' : '播放'
      },
      transMutedOrNot(value) {
        return value ? '放音' : '静音'
      },
      transSpeed(value) {
        return '快进: x' + value
      }
    },
    created() {
      this.setControlList()
    }
  }
</script>

<style scoped lang="scss">
  .right{
     width: 100%;
     padding: 10px 15px;
     display: inline-block;
     .slider {
       display: inline-block;
       position: relative;
       top: 14px;
       margin-left: 15px;
     }
     .slider_time{
       width: 550px;
       margin: 0 10px;
     }
     .slider_voice{
       width: 80px;
     }
     .download {
       color: #409EFF;
       margin-left: 15px;
     }

     .dn{
       display: none;
     }
   }

</style>