<template>
  <view class="chapter-detail-page">
    <!-- 自定义导航栏 -->
    <nav-bar :title="$t('courseDetails.chapter')" />
    
    <!-- 页面内容 -->
    <view class="page-content" :style="{ height: contentHeight }">
      <!-- 视频播放器 -->
      <view v-if="videoList.length > 0" class="video-section">
        <VideoPlayer
          ref="videoPlayerRef"
          v-model:current-index="currentVideoIndex"
          :video-list="videoList"
          :countdown-seconds="5"
        />
        <!-- <AliyunPlayer
          ref="videoPlayerRef"
          :currentVideo="videoList[currentVideoIndex]"
          :currentVideoList="videoList"
          @unlockChangeVideo="changeVideoLock = false"
        /> -->
      </view>
      
      <!-- 课程和章节信息 -->
      <view class="info-section">
        <view class="info-item">
          <text class="label">{{ $t('courseDetails.courseInfo') }}：</text>
          <text class="value">{{ navTitle }}</text>
        </view>
        <view class="info-item">
          <text class="label">{{ $t('courseDetails.chapterInfo') }}：</text>
          <text class="value">{{ chapterTitle }}</text>
        </view>
      </view>
      
      <!-- 视频列表 -->
      <view v-if="videoList.length > 0" class="video-list-section">
        <view class="section-title">{{ $t('courseDetails.videoTeaching') }}</view>
        <view class="video-list">
          <view
            v-for="(video, index) in videoList"
            :key="video.id"
            :class="['video-item', currentVideoIndex === index ? 'active' : '']"
            @click="selectVideo(index)"
          >
            <view class="video-info">
              <text class="video-title">【{{ video.type == "2" ? "音频" : "视频" }}】{{ index + 1 }}</text>
            </view>
          </view>
        </view>
      </view>
      
      <!-- 选项卡 -->
      <view v-if="tabList.length > 0" class="tabs-section">
        <view class="tabs">
          <view
            v-for="(tab, index) in tabList"
            :key="tab.id"
            :class="['tab-item', currentTab === index ? 'active' : '']"
            @click="switchTab(index)"
          >
            <text>{{ tab.name }}</text>
          </view>
        </view>
      </view>
      
      <!-- 选项卡内容 -->
      <view class="tab-content">
        <!-- 章节介绍 -->
        <view v-show="currentTab === 0" class="intro-content">
          <view class="section-title">{{ $t('courseDetails.chapterIntro') }}</view>
          <view class="intro-wrapper">
            <!-- 章节封面 -->
            <image
              v-if="chapterDetail?.imgUrl"
              :src="chapterDetail.imgUrl"
              mode="widthFix"
              class="chapter-image"
              @click="previewImage(chapterDetail.imgUrl)"
            />
            
            <!-- 章节内容 -->
            <view v-if="chapterDetail?.content" class="chapter-content" v-html="chapterDetail.content"></view>
          </view>
          
          <view class="copyright">
            <text>{{ $t('courseDetails.copyright') }}</text>
          </view>
        </view>
        
        <!-- 思考题 -->
        <view v-show="currentTab === 1" class="question-content">
          <view class="section-title">{{ $t('courseDetails.thinkingQuestion') }}</view>
          <view v-if="chapterDetail?.questions" class="question-wrapper">
            <view class="question-html" v-html="chapterDetail.questions"></view>
          </view>
          <view v-else class="no-question">
            <wd-divider>{{ $t('courseDetails.noQuestion') }}</wd-divider>
          </view>
        </view>
      </view>
    </view>
  </view>
</template>

<script setup lang="ts">
import { ref, computed } from 'vue'
import { onLoad, onShow, onHide } from '@dcloudio/uni-app'
import { courseApi } from '@/api/modules/course'
import VideoPlayer from '@/components/video-player/index.vue'
import type { IChapterDetail, IVideo } from '@/types/course'

// 页面参数
const chapterId = ref<number>(0)
const courseId = ref<number>(0)
const navTitle = ref('')
const chapterTitle = ref('')
const noRecored = ref(false)

// 页面数据
const chapterDetail = ref<IChapterDetail | null>(null)
const videoList = ref<IVideo[]>([])
const currentVideoIndex = ref(0)
const activeVideoIndex = ref(0)
const currentTab = ref(0)
const isFullScreen = ref(false)

// 视频播放器引用
const videoPlayerRef = ref<any>(null)

// 选项卡列表
const tabList = computed(() => {
  const tabs = [
    { id: '0', name: '章节介绍' }
  ]
  
  // 如果有思考题，添加思考题选项卡
  if (chapterDetail.value?.questions) {
    tabs.push({ id: '1', name: '思考题' })
  }
  
  return tabs
})

// 内容高度（全屏时调整）
const contentHeight = computed(() => {
  return isFullScreen.value ? '100vh' : 'auto'
})

/**
 * 页面加载
 */
onLoad((options: any) => {
  chapterId.value = parseInt(options.id)
  courseId.value = parseInt(options.courseId)
  navTitle.value = options.navTitle || ''
  chapterTitle.value = options.title || ''
  noRecored.value = options.noRecored === 'true'
  
  loadChapterDetail()
})

/**
 * 加载章节详情
 */
const loadChapterDetail = async () => {
  try {    
    const res = await courseApi.getChapterDetail(chapterId.value)
    if (res.code === 0 && res.data) {
      chapterDetail.value = res.data.detail
      videoList.value = res.data.videos || []

      // 如果有历史播放记录，定位到对应视频
      if (res.data.current) {
        const index = videoList.value.findIndex(v => v.id === res.data.current)
        if (index !== -1) {
          currentVideoIndex.value = index
          activeVideoIndex.value = index
        }
      }
    }
  } catch (error) {
    console.error('加载章节详情失败:', error)
  }
}

/**
 * 选择视频
 */
const selectVideo = async (index: number) => {
  if (index === currentVideoIndex.value) return
  currentVideoIndex.value = index
}

/**
 * 切换选项卡
 */
const switchTab = (index: number) => {
  currentTab.value = index
}

/**
 * 预览图片
 */
const previewImage = (url: string) => {
  uni.previewImage({
    urls: [url],
    current: url
  })
}
</script>

<style lang="scss" scoped>
.chapter-detail-page {
  min-height: 100vh;
  background-color: #f5f5f5;
}

.page-content {
  padding-bottom: 100rpx;
}

.video-section {
  background-color: #000;
}

.info-section {
  padding: 20rpx;
  background-color: #fff;
  
  .info-item {
    margin-bottom: 15rpx;
    font-size: 26rpx;
    color: #666;
    
    &:last-child {
      margin-bottom: 0;
    }
    
    .label {
      color: #999;
    }
    
    .value {
      color: #333;
    }
  }
}

.video-list-section {
  padding: 20rpx;
  background-color: #fff;
  margin-top: 20rpx;
  
  .section-title {
    font-size: 32rpx;
    font-weight: 500;
    color: #2979ff;
    margin-bottom: 20rpx;
  }
  
  .video-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: center;
    gap: 10rpx;

    .video-item {
      padding: 18rpx;
      margin-bottom: 10rpx;
      background-color: #f7f8f9;
      border-radius: 8rpx;
      border: 2rpx solid transparent;
      transition: all 0.3s;
      
      &.active {
        background-color: #e8f4ff;
        border-color: #258feb;
      }
      
      .video-info {
        display: flex;
        justify-content: space-between;
        align-items: center;
        
        .video-title {
          flex: 1;
          font-size: 28rpx;
          color: #333;
        }
      }
    }
  }
}

.tabs-section {
  background-color: #fff;
  margin-top: 20rpx;
  border-bottom: 2rpx solid #2979ff;
  
  .tabs {
    display: flex;
    
    .tab-item {
      flex: 1;
      text-align: center;
      padding: 25rpx 0;
      font-size: 30rpx;
      color: #666;
      position: relative;
      transition: all 0.3s;
      
      &.active {
        color: #2979ff;
        font-weight: 500;
        
        &::after {
          content: '';
          position: absolute;
          bottom: 0;
          left: 50%;
          transform: translateX(-50%);
          width: 60rpx;
          height: 4rpx;
          background-color: #2979ff;
          border-radius: 2rpx;
        }
      }
    }
  }
}

.tab-content {
  background-color: #fff;
  padding: 20rpx;
  
  .section-title {
    font-size: 32rpx;
    font-weight: 500;
    color: #333;
    margin-bottom: 20rpx;
  }
  
  .intro-content {
    .intro-wrapper {
      .chapter-image {
        width: 100%;
        display: block;
        margin-bottom: 20rpx;
        border-radius: 8rpx;
      }
      
      .chapter-content {
        font-size: 28rpx;
        line-height: 1.8;
        color: #666;
        text-align: justify;
        word-break: break-all;
      }
    }
    
    .copyright {
      margin-top: 40rpx;
      padding-top: 20rpx;
      border-top: 1px solid #f0f0f0;
      text-align: center;
      
      text {
        font-size: 24rpx;
        color: #ff4444;
      }
    }
  }
  
  .question-content {
    .question-wrapper {
      .question-html {
        font-size: 28rpx;
        line-height: 1.8;
        color: #666;
        word-break: break-all;
      }
    }
    
    .no-question {
      padding: 80rpx 0;
      text-align: center;
    }
  }
}
</style>
