<template>
  <div id="allstyle">
    <div class="header">
      <h1>文章目录</h1>
    </div>
    
    <!-- 加载状态 -->
    <div v-if="loading" class="loading-container">
      <el-skeleton :count="5" />
    </div>
    
    <!-- 错误状态 -->
    <div v-else-if="error" class="error-container">
      <el-alert :title="error" type="error" show-icon />
      <el-button type="primary" @click="fetchCategories">重新加载</el-button>
    </div>
    
    <!-- 分类列表 -->
    <div v-else-if="categories.length > 0" class="post_content">
      <div v-for="categoryGroup in categories" :key="categoryGroup.name" class="category-group">
        <div class="category-header">
          <h2>{{ categoryGroup.name }}</h2>
          <span class="badge badge-primary">共{{ getCategorySum(categoryGroup.categories) }}篇</span>
        </div>
        
        <ul class="pcont_ul">
          <li class="pcont_li" v-for="category in categoryGroup.categories" :key="category.typeid">
            <button class="btn" @click="handleCategoryClick(category.typeid)">
              <kbd>{{ category.content }}</kbd>
            </button>
            <span class="category-count">({{ category.sum }})</span>
          </li>
        </ul>
      </div>
    </div>
    
    <!-- 空状态 -->
    <div v-else class="empty-container">
      <el-empty description="暂无分类" />
    </div>
  </div>
</template>

<script setup lang="ts">
import { useRouter } from 'vue-router'
import { ref, onMounted } from 'vue'
import { articleService } from '@/services'
import { ElMessage } from 'element-plus'
import type { Category } from '@/types'

const router = useRouter()

// 响应式状态
const categories = ref<any[]>([])
const loading = ref(false)
const error = ref('')

/**
 * 获取文章分类列表
 */
const fetchCategories = async () => {
  try {
    loading.value = true
    error.value = ''
    
    // 获取所有文章数据，然后从中提取分类信息
    const res = await articleService.getAllArticles()
    
    if (res.data && res.data.length > 0) {
      // 假设数据结构是嵌套的分类组
      categories.value = res.data
    } else {
      categories.value = []
    }
    
    console.log('获取分类列表成功:', categories.value)
  } catch (err) {
    error.value = '获取分类列表失败，请稍后重试'
    console.error('获取分类列表失败:', err)
    ElMessage.error(error.value)
  } finally {
    loading.value = false
    console.log('分类列表加载完成')
  }
}

/**
 * 处理分类点击事件
 * @param {string} typeid - 分类ID
 */
const handleCategoryClick = (typeid: string) => {
  router.push({
    path: '/:type',
    query: {
      type: typeid
    }
  })
}

/**
 * 计算分类组中的文章总数
 * @param {Array} categoryItems - 分类项数组
 * @returns {number} 文章总数
 */
const getCategorySum = (categoryItems: any[]): number => {
  if (!categoryItems || !Array.isArray(categoryItems)) {
    return 0
  }
  
  return categoryItems.reduce((total, item) => {
    return total + (item.sum || 0)
  }, 0)
}

/**
 * 组件挂载时获取分类列表
 */
onMounted(() => {
  fetchCategories()
})
</script>

<style scoped>
.header {
  text-align: center;
  padding: 20px;
  margin-bottom: 20px;
}

.header h1 {
  color: #2c3e50;
  font-size: 1.8rem;
}

.post_content {
  padding: 20px;
}

.category-group {
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.category-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid #ecf0f1;
}

.category-header h2 {
  color: #34495e;
  font-size: 1.4rem;
  margin: 0;
}

.pcont_ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 15px;
  margin-top: 20px;
}

.pcont_li {
  display: flex;
  align-items: center;
  padding: 10px 15px;
  border-radius: 12px;
  background-color: rgba(245, 247, 250, 0.7);
  transition: transform 0.3s ease;
  gap: 10px;
}

.pcont_li:hover {
  transform: translateY(-2px);
  background-color: rgba(236, 240, 241, 0.9);
}

.btn {
  position: relative;
  text-decoration: none;
  color: #34495e;
  padding: 10px 15px;
  border-radius: 8px;
  transition: all 0.3s ease;
  display: inline-block;
  z-index: 1;
  overflow: hidden;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 1rem;
}

/* 透明方块效果 */
.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 8px;
  z-index: -1;
  transition: all 0.3s ease;
  transform: scale(0.95);
  opacity: 0.8;
  background: rgba(255, 255, 255, 0.5);
}

/* 悬浮效果 */
.btn:hover::before {
  transform: scale(1.1);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  background: rgba(145, 196, 238, 0.85);
}

.category-count {
  color: #7f8c8d;
  font-size: 0.9rem;
}

/* 标签样式 */
.badge {
  text-transform: uppercase;
}

.badge-primary {
  color: #2643e9;
  background-color: rgba(203, 210, 246, .5);
}

.badge {
  font-size: 66%;
  font-weight: 600;
  line-height: 1;
  display: inline-block;
  padding: .35rem .375rem;
  transition: color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out, box-shadow .15s ease-in-out;
  text-align: center;
  vertical-align: baseline;
  white-space: nowrap;
  border-radius: .25rem;
}

/* 加载状态 */
.loading-container {
  padding: 40px 20px;
  text-align: center;
}

/* 错误状态 */
.error-container {
  text-align: center;
  padding: 40px 20px;
}

.error-container .el-button {
  margin-top: 16px;
}

/* 空状态 */
.empty-container {
  text-align: center;
  padding: 60px 20px;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .header {
    padding: 15px;
  }
  
  .header h1 {
    font-size: 1.5rem;
  }
  
  .post_content {
    padding: 15px;
  }
  
  .category-group {
    padding: 15px;
    margin-bottom: 15px;
  }
  
  .category-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  
  .pcont_ul {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  .category-header h2 {
    font-size: 1.2rem;
  }
}
</style>