<template>
  <a-card :bordered="false">
    <div class="video-box">
      <div class="video-title">{{ courseInfo.name }}</div>
      <div class="video-main">
        <video-player
          class="vjs-custom-skin"
          ref="videoPlayer"
          :options="playerOptions"
          :playsinline="true"
          @ended="onPlayerEnded($event)"
          @timeupdate="onPlayerTimeupdate"
        ></video-player>
      </div>
    </div>
    <div class="video-info">
      <a-tabs :default-active-key="activeTab" @change="tabChange">
        <a-tab-pane key="1" tab="课程目录">
          <div class="tab-box">
            <CourseCatalogue
              @changeVideo="changeVideo"
              :catalogueList="catalogueList"
              :curVideo="curVideo"
            ></CourseCatalogue>
          </div>
        </a-tab-pane>
        <a-tab-pane key="2" tab="模拟测试">
          <div class="tab-box">
            <SimulationTest></SimulationTest>
          </div>
        </a-tab-pane>
        <a-tab-pane key="3" tab="作业">
          <div class="tab-box">
            <OperationModule></OperationModule>
          </div>
        </a-tab-pane>
        <a-tab-pane key="4" tab="学习统计">
          <div class="tab-box">
            <StatisticalLearning :courseInfo="courseInfo"></StatisticalLearning>
          </div>
        </a-tab-pane>
      </a-tabs>
    </div>
    <!-- 课中考试 -->
    <ExamDialog ref="examDialog" :curVideo="curVideo"></ExamDialog>
  </a-card>
</template>

<script>
import 'video.js/dist/video-js.css'
import 'vue-video-player/src/custom-theme.css'
import { videoPlayer } from 'vue-video-player'
import CourseCatalogue from './CourseCatalogue.vue'
import SimulationTest from './SimulationTest.vue'
import ExamDialog from './ExamDialog.vue'
import OperationModule from './OperationModule.vue'
import StatisticalLearning from './StatisticalLearning.vue'
import { reqCourseDetail, reqCourseCatalogue } from '@/api/mycourse/index'

export default {
  components: {
    CourseCatalogue,
    OperationModule,
    SimulationTest,
    ExamDialog,
    StatisticalLearning,
    videoPlayer
  },
  data () {
    return {
      activeTab: '1',
      query: {},
      courseInfo: {},
      catalogueList: [], // 目录列表
      curVideo: {}, // 当前播放的视频信息
      playerOptions: {},
      isMousedown: false,
      oldTime: 0,
      newTime: 0,
      maxTime: 0
    }
  },
  mounted () {
    const query = this.$route.query
    this.query = query
    this.initData()
  },
  methods: {
    initData () {
      const { person } = this.$store.state.user
      // 获取课程详情
      reqCourseDetail({ personId: person.id, id: this.query.courseId }).then(res => {
        this.courseInfo = res.data
      })
      // 获取课程目录
      reqCourseCatalogue({ personId: person.id, projectId: this.query.courseId }).then(res => {
        const data = res.data
        let videoList = []
        if (Array.isArray(data)) {
          data.map(item => {
            videoList = [...videoList, ...item.courseList]
            if (Array.isArray(item.courseList)) {
              item.courseList.map(j => {
                j.courseId = item.id
              })
            }
          })
        }
        const selected = videoList[0] || ''
        if (selected) {
          this.curVideo = selected
          this.playerOptions = {
            height: '360',
            autoplay: false,
            muted: false,
            language: 'zh-CN',
            sources: [
              {
                type: 'video/mp4',
                src: selected.videoAddress
              }
            ],
            controlBar: {
              /* 使用children的形式可以控制每一个控件的位置，以及显示与否 */
              children: [
                { name: 'playToggle' }, // 播放按钮
                { name: 'currentTimeDisplay' }, // 当前已播放时间
                { name: 'progressControl' }, // 播放进度条
                { name: 'durationDisplay' }, // 总时间
                {
                  name: 'volumePanel', // 音量控制
                  inline: false // 不使用水平方式
                },
                { name: 'FullscreenToggle' } // 全屏
              ]
            },
            poster: selected.coverPath
          }
        }
        this.catalogueList = data
      })
    },
    // 切换视频
    changeVideo ({ item, pItem }) {
      const _this = this
      const vid = this.$refs.videoPlayer.player
      const change = function () {
        _this.curVideo = item
        vid.src(item.videoAddress)
        vid.play()
        _this.openCourseExam() // 调试用
      }
      if (this.oldTime > 0) {
        this.$confirm({
          title: '确定要切换学习视频吗?',
          content: '一但切换学习视频,您现在正在学习的视频学时将清0,确定要切换吗?',
          onOk () {
            change()
          },
          onCancel () {}
        })
      } else {
        change()
      }
    },
    tabChange (key) {
      // this.$refs.videoPlayer.player.play() // 播放
      // this.$refs.videoPlayer.player.pause() // 暂停
      // this.$refs.videoPlayer.player.src('src') // 重置进度条复制代码
    },
    // 当视频播放完毕的回调处理
    onPlayerEnded () {
      console.log('播放完毕')
      this.openCourseExam()
    },
    // 打开课中检查
    openCourseExam () {
      const _this = this
      const curVideo = this.curVideo
      if (curVideo.status === 1) return
      this.$confirm({
        title: '课中检查',
        content:
          '课程学习完成后都会随机出现1道小题，答对题目，方可继续下一部分学习，您有2次机会。否则之前上一小段学习时间不计算学时，需要重新学习!',
        onOk () {
          _this.$refs.examDialog.show()
          _this.$refs.examDialog.getExamQuestion()
        },
        onCancel () {}
      })
    },
    // 禁止快进
    onPlayerTimeupdate () {
      const { oldTime, maxTime } = this
      const vd = this.$refs.videoPlayer.player
      var current = vd.currentTime()
      if (current < maxTime) {
      } else if (current - oldTime > 1) {
        vd.currentTime(oldTime)
      } else {
        this.oldTime = current
        if (oldTime >= maxTime) {
          this.maxTime = oldTime
        }
      }
    }
  }
}
</script>

<style lang="less" scoped>
.video-title {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 15px;
  color: #333;
}

.video-info {
  margin-top: 15px;
}

::v-deep .ant-tabs-nav-scroll {
  text-align: center;
}
.tab-box {
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
}
</style>
