<template>
  <a-modal
    v-model:open="visible"
    :title="modalTitle"
    width="900px"
    :footer="null"
    :maskClosable="false"
    class="video-selector-modal"
  >
    <div class="video-selector">
      <!-- 搜索栏 -->
      <div class="search-bar">
        <a-input-search
          v-model:value="searchKeyword"
          placeholder="搜索视频名称"
          allow-clear
          @search="handleSearch"
          class="search-input"
        />
      </div>

      <!-- 视频网格 -->
      <div class="video-grid" v-loading="loading">
        <div
          v-for="video in videoList"
          :key="video.id"
          class="video-card"
          :class="{ selected: selectedVideoId === video.id }"
          @click="selectVideo(video)"
        >
          <div class="video-thumbnail">
            <img
              :src="getVideoPreviewUrl(video) || defaultCover"
              :alt="video.fileName"
              @error="handleImageError"
            />
            <div class="video-duration">{{ formatDuration(video.duration) }}</div>
            <div class="video-selected-mark" v-if="selectedVideoId === video.id">
              <CheckOutlined />
            </div>
          </div>
          <div class="video-info">
            <div class="video-title" :title="video.fileName">{{ video.fileName }}</div>
            <div class="video-meta">
              <span class="meta-item">
                <VideoCameraOutlined />
                {{ formatFileSize(video.fileSize) }}
              </span>
              <span class="meta-item">
                <ClockCircleOutlined />
                {{ formatDuration(video.duration) }}
              </span>
            </div>
          </div>
        </div>

        <!-- 空状态 -->
        <div v-if="!loading && videoList.length === 0" class="empty-state">
          <PictureOutlined class="empty-icon" />
          <p>{{ searchKeyword ? '未找到匹配的视频' : '暂无视频，请先上传视频' }}</p>
        </div>
      </div>

      <!-- 分页 -->
      <div class="pagination-wrapper" v-if="total > pageSize">
        <a-pagination
          v-model:current="currentPage"
          v-model:page-size="pageSize"
          :total="total"
          show-size-changer
          show-quick-jumper
          :show-total="(total, range) => `第 ${range[0]}-${range[1]} 条，共 ${total} 条`"
          @change="handlePageChange"
          @show-size-change="handlePageSizeChange"
        />
      </div>

      <!-- 底部操作栏 -->
      <div class="modal-footer">
        <a-button @click="handleCancel">取消</a-button>
        <a-button type="primary" @click="handleConfirm" :disabled="!selectedVideoId">
          确认选择
        </a-button>
      </div>
    </div>
  </a-modal>
</template>

<script setup>
import { ref, computed, watch } from 'vue'
import { message } from 'ant-design-vue'
import { CheckOutlined, PictureOutlined, VideoCameraOutlined, ClockCircleOutlined } from '@ant-design/icons-vue'
import { MaterialService } from '@/api/material'

const props = defineProps({
  open: {
    type: Boolean,
    default: false
  }
})

const emit = defineEmits(['update:open', 'select'])

// 状态管理
const visible = computed({
  get: () => props.open,
  set: (val) => emit('update:open', val)
})

const loading = ref(false)
const videoList = ref([])
const selectedVideoId = ref(null)
const selectedVideo = ref(null)
const searchKeyword = ref('')
const currentPage = ref(1)
const pageSize = ref(20)
const total = ref(0)

// 默认封面
const defaultCover = 'data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjAwIiBoZWlnaHQ9IjExMCIgdmlld0JveD0iMCAwIDIwMCAxMTAiIGZpbGw9Im5vbmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+CjxyZWN0IHdpZHRoPSIyMDAiIGhlaWdodD0iMTEwIiBmaWxsPSIjMzc0MTUxIi8+CjxwYXRoIGQ9Ik04NSA0NUwxMTUgNjVMMTA1IDg1TDc1IDc1TDg1IDQ1WiIgZmlsbD0iIzU3MjY1MSIvPgo8L3N2Zz4K'

// 模态框标题
const modalTitle = '选择视频'

// 获取视频列表
const fetchVideoList = async () => {
  loading.value = true
  try {
    const params = {
      page: currentPage.value,
      pageSize: pageSize.value,
      fileCategory: 'video',
      fileName: searchKeyword.value.trim() || undefined
    }

    const res = await MaterialService.getFilePage(params)
    if (res.code === 0) {
      videoList.value = res.data.list || []
      total.value = res.data.total || 0
    } else {
      message.error(res.msg || '获取视频列表失败')
    }
  } catch (error) {
    console.error('获取视频列表失败:', error)
    message.error('获取视频列表失败')
  } finally {
    loading.value = false
  }
}

// 搜索
const handleSearch = () => {
  currentPage.value = 1
  fetchVideoList()
}

// 分页变化
const handlePageChange = (page, size) => {
  currentPage.value = page
  if (size) {
    pageSize.value = size
  }
  fetchVideoList()
}

// 每页数量变化
const handlePageSizeChange = (_current, size) => {
  // _current 参数未使用，但需要保留以匹配事件处理器签名
  currentPage.value = 1
  pageSize.value = size
  fetchVideoList()
}

// 选择视频
const selectVideo = (video) => {
  selectedVideoId.value = video.id
  selectedVideo.value = video
}

// 图片加载错误处理
const handleImageError = (event) => {
  event.target.src = defaultCover
}

// 格式化时长
const formatDuration = (seconds) => {
  if (!seconds) return '--:--'
  const minutes = Math.floor(seconds / 60)
  const remainingSeconds = Math.floor(seconds % 60)
  return `${String(minutes).padStart(2, '0')}:${String(remainingSeconds).padStart(2, '0')}`
}

// 格式化文件大小
const formatFileSize = (bytes) => {
  if (!bytes) return '0 B'
  const units = ['B', 'KB', 'MB', 'GB']
  let size = bytes
  let unitIndex = 0
  while (size >= 1024 && unitIndex < units.length - 1) {
    size /= 1024
    unitIndex++
  }
  return `${size.toFixed(1)} ${units[unitIndex]}`
}

// 获取视频预览URL（优先使用base64，然后是URL）
const getVideoPreviewUrl = (video) => {
  // 优先使用 coverBase64（如果存在）
  if (video.coverBase64) {
    // 确保 base64 有正确的前缀
    if (!video.coverBase64.startsWith('data:')) {
      return `data:image/jpeg;base64,${video.coverBase64}`
    }
    return video.coverBase64
  }

  // 其次使用 previewUrl
  if (video.previewUrl) {
    return video.previewUrl
  }

  // 最后使用 coverUrl
  if (video.coverUrl) {
    return video.coverUrl
  }

  // 返回默认封面
  return defaultCover
}

// 取消
const handleCancel = () => {
  visible.value = false
  selectedVideoId.value = null
  selectedVideo.value = null
  searchKeyword.value = ''
}

// 确认
const handleConfirm = () => {
  if (!selectedVideo.value) {
    message.warning('请选择一个视频')
    return
  }

  emit('select', selectedVideo.value)
  handleCancel()
}

// 监听visible变化
watch(() => props.open, (newVal) => {
  if (newVal) {
    selectedVideoId.value = null
    selectedVideo.value = null
    currentPage.value = 1
    fetchVideoList()
  }
})
</script>

<style scoped>
.video-selector {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.search-bar {
  padding: 16px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
}

.search-input {
  width: 100%;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  max-height: 500px;
  overflow-y: auto;
  padding: 4px;
}

.video-card {
  background: rgba(0, 0, 0, 0.3);
  border: 2px solid rgba(59, 130, 246, 0.2);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.3s;
}

.video-card:hover {
  border-color: rgba(59, 130, 246, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.video-card.selected {
  border-color: #3B82F6;
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.video-thumbnail {
  position: relative;
  width: 100%;
  height: 112px;
  overflow: hidden;
  background: #374151;
}

.video-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

.video-selected-mark {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 24px;
  height: 24px;
  background: #3B82F6;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.video-info {
  padding: 12px;
}

.video-title {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.video-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: #94a3b8;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: #94a3b8;
}

.empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
  color: #6b7280;
}

.pagination-wrapper {
  display: flex;
  justify-content: center;
  padding: 16px 0;
  border-top: 1px solid rgba(59, 130, 246, 0.1);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid rgba(59, 130, 246, 0.1);
}
</style>
