<script lang="ts" setup>
import { ref, onMounted, computed } from 'vue'
import { fetchRecommendedArticles, getArticleTypeName, type Article } from '~/composables/useArticleApi'

// 组件属性
interface Props {
  showTypes?: string[] // 显示的文章类型
  articlesPerType?: number // 每个类型显示的文章数量
  showTitle?: boolean // 是否显示标题
  title?: string // 自定义标题
}

const props = withDefaults(defineProps<Props>(), {
  showTypes: () => ['solution', 'developKnowledge', 'industryTrend'],
  articlesPerType: 5,
  showTitle: true,
  title: '推荐文章'
})

// 响应式数据
const articles = ref<Record<string, Article[]>>({})
const loading = ref(false)
const error = ref('')

// 计算属性
const hasArticles = computed(() => {
  return Object.values(articles.value).some(typeArticles => typeArticles.length > 0)
})

// 格式化时间
const formatTime = (timeStr: string): string => {
  if (!timeStr) return ''
  const date = new Date(timeStr)
  const year = date.getFullYear()
  const month = String(date.getMonth() + 1).padStart(2, '0')
  const day = String(date.getDate()).padStart(2, '0')
  return `${year}-${month}-${day}`
}

// 获取文章链接
const getArticleLink = (article: Article): string => {
  // 根据文章ID生成链接，这里可以根据实际路由规则调整
  return `/article/${article.id}`
}

// 加载推荐文章
const loadRecommendedArticles = async () => {
  loading.value = true
  error.value = ''
  
  try {
    const result = await fetchRecommendedArticles(props.showTypes, props.articlesPerType)
    articles.value = result
  } catch (err) {
    console.error('加载推荐文章失败:', err)
    error.value = '加载推荐文章失败，请稍后重试'
  } finally {
    loading.value = false
  }
}

// 组件挂载时加载数据
onMounted(() => {
  // 只在客户端执行
  if (typeof window !== 'undefined') {
    loadRecommendedArticles()
  }
})
</script>

<template>
  <div class="recommended-articles">
    <!-- 标题 -->
    <div v-if="showTitle" class="articles-title">
      <h3>{{ title }}</h3>
    </div>

    <!-- 加载状态 -->
    <div v-if="loading" class="loading">
      <div class="loading-spinner"></div>
      <span>加载中...</span>
    </div>

    <!-- 错误状态 -->
    <div v-else-if="error" class="error">
      <p>{{ error }}</p>
      <button @click="loadRecommendedArticles" class="retry-btn">重试</button>
    </div>

    <!-- 文章列表 -->
    <div v-else-if="hasArticles" class="articles-content">
      <div 
        v-for="(typeArticles, typeCode) in articles" 
        :key="typeCode"
        v-show="typeArticles.length > 0"
        class="article-type-section"
      >
        <!-- 类型标题 -->
        <div class="type-title">
          <h4>{{ getArticleTypeName(typeCode) }}</h4>
        </div>

        <!-- 文章列表 -->
        <div class="article-list">
          <div 
            v-for="article in typeArticles" 
            :key="article.id"
            class="article-item"
          >
            <a 
              :href="getArticleLink(article)" 
              :title="article.title"
              class="article-link"
            >
              <div class="article-content">
                <h5 class="article-title">{{ article.title }}</h5>
                <div class="article-meta">
                  <span class="article-date">{{ formatTime(article.createTime) }}</span>
                </div>
                <p v-if="article.brief" class="article-brief">{{ article.brief }}</p>
              </div>
            </a>
          </div>
        </div>
      </div>
    </div>

    <!-- 无数据状态 -->
    <div v-else class="no-articles">
      <p>暂无推荐文章</p>
    </div>
  </div>
</template>

<style scoped>
.recommended-articles {
  width: 100%;
}

.articles-title {
  margin-bottom: 20px;
}

.articles-title h3 {
  font-size: 24px;
  font-weight: bold;
  color: #333;
  margin: 0;
  padding-bottom: 10px;
  border-bottom: 2px solid #007bff;
}

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 0;
  color: #666;
}

.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid #f3f3f3;
  border-top: 2px solid #007bff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-right: 10px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.error {
  text-align: center;
  padding: 40px 0;
  color: #dc3545;
}

.retry-btn {
  background: #007bff;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 10px;
}

.retry-btn:hover {
  background: #0056b3;
}

.articles-content {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.article-type-section {
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 20px;
  background: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.type-title {
  margin-bottom: 15px;
}

.type-title h4 {
  font-size: 18px;
  font-weight: 600;
  color: #007bff;
  margin: 0;
  padding-bottom: 8px;
  border-bottom: 1px solid #e9ecef;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-item {
  border-bottom: 1px solid #f8f9fa;
  padding-bottom: 12px;
}

.article-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.article-link {
  text-decoration: none;
  color: inherit;
  display: block;
  transition: all 0.3s ease;
}

.article-link:hover {
  color: #007bff;
}

.article-content {
  padding: 8px 0;
}

.article-title {
  font-size: 16px;
  font-weight: 500;
  color: #333;
  margin: 0 0 8px 0;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.article-date {
  font-size: 12px;
  color: #6c757d;
  background: #f8f9fa;
  padding: 2px 6px;
  border-radius: 3px;
}

.article-brief {
  font-size: 14px;
  color: #666;
  margin: 0;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.no-articles {
  text-align: center;
  padding: 40px 0;
  color: #6c757d;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .articles-title h3 {
    font-size: 20px;
  }
  
  .article-type-section {
    padding: 15px;
  }
  
  .type-title h4 {
    font-size: 16px;
  }
  
  .article-title {
    font-size: 14px;
  }
}
</style>
