<template>
  <div class="app-container">
    <!-- 添加章节按钮 -->
    <div>
      <el-button type="primary" @click="addChapter()">添加章节</el-button>
    </div>

    <!-- 章节列表 -->
    <ul class="chapterList">
      <li v-for="chapter in chapterList" :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
            <el-button type="text" @click="addVideo(chapter.id)">添加课时</el-button>
            <el-button type="text" @click="editChapter(chapter.id)">编辑</el-button>
            <el-button type="text" @click="removeChapterById(chapter.id)">删除</el-button>
          </span>
        </p>
        <!-- 视频 -->
        <ul class="chapterList videoList">
          <li v-for="video in chapter.videos" :key="video.id">
            <p>
              {{ video.title }}
              <el-tag v-if="!video.videoSourceId" size="mini" type="danger">{{ '尚未上传视频' }}</el-tag>
              <span class="acts">
                <el-tag v-if="video.isFree === 0" size="mini" type="success">{{ '免费观看' }}</el-tag>
                <el-button type="text" @click="editVideo(chapter.id, video.id)">编辑</el-button>
                <el-button type="text" @click="removeVideoById(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <!-- 章节表单对话框 -->
    <chapter-form ref="chapterForm"/>
    <!-- 课时表单对话框 -->
    <video-form ref="videoForm"/>

    <div style="text-align:center">
      <el-button type="primary" @click="prev()">上一步</el-button>
      <el-button type="primary" @click="next()">下一步</el-button>
    </div>
  </div>
</template>

<script>
import chapterApi from '@/api/vod/chapter'
import videoApi from '@/api/vod/video'

import ChapterForm from '@/views/vod/course/outline/CourseChapterForm'
import VideoForm from '@/views/vod/course/outline/CourseVideoForm'

export default {
  components: { ChapterForm, VideoForm },
  data() {
    return {
      chapterList: []
    }
  },
  created() {
    this.fetchNodeList()
  },
  methods: {
    // 获取章节小节数据
    fetchNodeList() {
      chapterApi.getNestedTreeList(this.$parent.courseId).then(response => {
        this.chapterList = response.data
      })
    },

    // 添加章节
    addChapter() {
      this.$refs.chapterForm.open()
    },

    // 删除章节
    removeChapterById(chapterId) {
      this.$confirm('此操作将永久删除该章节，是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return chapterApi.removeById(chapterId)
      }).then(response => {
        this.fetchNodeList()
        this.$message.success(response.message)
      }).catch((response) => {
        if (response === 'cancel') {
          this.$message.info('取消删除')
        }
      })
    },

    // 编辑章节
    editChapter(chapterId) {
      this.$refs.chapterForm.open(chapterId)
    },

    // 添加课时
    addVideo(chapterId) {
      this.$refs.videoForm.open(chapterId)
    },

    // 编辑课时
    editVideo(chapterId, videoId) {
      this.$refs.videoForm.open(chapterId, videoId)
    },

    // 删除课时
    removeVideoById(videoId) {
      this.$confirm('此操作将永久删除该课时, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return videoApi.removeById(videoId)
      }).then(response => {
        this.$message.success(response.message)
        this.fetchNodeList()
      }).catch((response) => {
        if (response === 'cancel') {
          this.$message.info('取消删除')
        }
      })
    },

    // 上一步
    prev() {
      this.$parent.active = 0
    },
    // 下一步
    next() {
      this.$parent.active = 2
    }
  }
}
</script>
<style scoped>
.chapterList {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.chapterList li {
  position: relative;
}

.chapterList p {
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}

.chapterList .acts {
  float: right;
  font-size: 14px;
}

.videoList {
  padding-left: 50px;
}

.videoList p {
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dashed #DDD;
}
</style>
