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<template>
  <div class="camera_outer">
    <div class="img">
      <video id="videoCamera" :width="videoWidth" :height="videoHeight" autoplay></video>
      <canvas style="display:none;" id="canvasCamera" :width="videoWidth" :height="videoHeight"></canvas>

      <div v-if="imgSrc" class="img_bg_camera">
        <img :src="imgSrc" alt="" class="tx_img">
      </div>
    </div>
    <el-button type="primary" @click="getCompetence">打开摄像头</el-button>
    <el-button type="primary" @click="stopNavigator">关闭摄像头</el-button>
    <el-button type="primary" @click="setImage">拍照</el-button>
    <el-button type="primary" @click="cleanImage">清除</el-button>
    <div>
      <el-select style="width: 200px;" @change="changeCamera" v-model="value">
        <el-option v-for="device in videoDevices" :key="device.deviceId" :value="device.deviceId">{{ device.label }}</el-option>
      </el-select>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      videoWidth: 400,
      videoHeight: 300,
      imgSrc: '',
      thisCancas: null,
      thisContext: null,
      thisVideo: null,
      videoDevices: [],
      currentDeviceId: null,
      value: ''
    }
  },
  mounted() {
    this.getVideoDevices()
  },
  methods: {
    async getCompetence() {
      var _this = this
      this.thisCancas = document.getElementById('canvasCamera')
      this.thisContext = this.thisCancas.getContext('2d')
      this.thisVideo = document.getElementById('videoCamera')

      if (navigator.mediaDevices === undefined) {
        navigator.mediaDevices = {}
      }
      if (navigator.mediaDevices.getUserMedia === undefined) {
        navigator.mediaDevices.getUserMedia = function (constraints) {
          var getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.getUserMedia
          if (!getUserMedia) {
            return Promise.reject(new Error('getUserMedia is not implemented in this browser'))
          }
          return new Promise(function (resolve, reject) {
            getUserMedia.call(navigator, constraints, resolve, reject)
          })
        }
      }

      await this.getVideoDevices()
      if (this.videoDevices.length > 0) {
        this.currentDeviceId = this.videoDevices[0].deviceId
        this.value = this.videoDevices[0].label
      }

      var constraints = { audio: false, video: { deviceId: this.currentDeviceId ? { exact: this.currentDeviceId } : undefined, width: this.videoWidth, height: this.videoHeight, transform: 'scaleX(-1)' } }
      navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
        if ('srcObject' in _this.thisVideo) {
          _this.thisVideo.srcObject = stream
        } else {
          _this.thisVideo.src = window.URL.createObjectURL(stream)
        }
        _this.thisVideo.onloadedmetadata = function (e) {
          _this.thisVideo.play()
        }
      }).catch(err => {
        console.log(err)
      })
    },
    async getVideoDevices() {
      const devices = await navigator.mediaDevices.enumerateDevices()
      this.videoDevices = devices.filter(device => device.kind === 'videoinput')
      console.log(this.videoDevices);
    },
    changeCamera(value) {
      console.log(value)
      this.currentDeviceId = value
      this.stopNavigator()
      this.getCompetence()
    },
    setImage() {
      var _this = this
      _this.thisContext.drawImage(_this.thisVideo, 0, 0, _this.videoWidth, _this.videoHeight)
      var image = this.thisCancas.toDataURL('image/png')
      _this.imgSrc = image
      this.$emit('refreshDataList', this.imgSrc)
    },
    dataURLtoFile(dataurl, filename) {
      var arr = dataurl.split(',')
      var mime = arr[0].match(/:(.*?);/)[1]
      var bstr = atob(arr[1])
      var n = bstr.length
      var u8arr = new Uint8Array(n)
      while (n--) {
        u8arr[n] = bstr.charCodeAt(n)
      }
      return new File([u8arr], filename, { type: mime })
    },
    stopNavigator() {
      this.thisVideo?.srcObject?.getTracks()?.forEach(track => track.stop())
    },
    cleanImage() {
      this.imgSrc = ''
      this.value = ''
      this.thisVideo = null
    }
  },
}
</script>

<style lang="scss" scoped>
.camera_outer {
  position: relative;
  overflow: hidden;
  background: url("../../assets/img/user_0608_04.png") no-repeat center;
  background-size: 100%;

  video,
  canvas,
  .tx_img {
    -moz-transform: scaleX(-1);
    -webkit-transform: scaleX(-1);
    -o-transform: scaleX(-1);
    transform: scaleX(-1);
  }

  .btn_camera {
    position: absolute;
    bottom: 4px;
    left: 0;
    right: 0;
    height: 50px;
    background-color: rgba(0, 0, 0, 0.3);
    line-height: 50px;
    text-align: center;
    color: #ffffff;
  }

  .bg_r_img {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    top: 0;
  }

  .img_bg_camera {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    top: 0;
    width: 100%;
    height: fit-content;
    
    .img_btn_camera {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 50px;
      line-height: 50px;
      text-align: center;
      background-color: rgba(0, 0, 0, 0.3);
      color: #ffffff;

      .loding_img {
        width: 50px;
        height: 50px;
      }
    }
  }
}
</style>