---
interface Props {
  title?: string;
  itemsPerPage?: number;
}

const { 
  title = "文章时间线", 
  itemsPerPage = 10 
} = Astro.props;
---

<div class="container mx-auto px-4 py-8">
  {title && <h1 class="text-3xl font-bold mb-6 text-primary-900 dark:text-primary-100">{title}</h1>}
  
  <div id="article-timeline" class="relative space-y-8 before:absolute before:inset-0 before:ml-5 before:h-full before:w-0.5 before:-translate-x-px before:bg-gradient-to-b before:from-transparent before:via-primary-300 before:to-transparent md:before:mx-auto md:before:translate-x-0">
    <!-- 内容将通过JS动态加载 -->
  </div>
  
  <div id="loading" class="text-center py-8">
    <div class="inline-block h-8 w-8 animate-spin rounded-full border-4 border-solid border-primary-500 dark:border-primary-400 border-r-transparent align-[-0.125em] motion-reduce:animate-[spin_1.5s_linear_infinite]"></div>
    <p class="mt-2 text-secondary-600 dark:text-secondary-400">加载更多...</p>
  </div>
  
  <div id="end-message" class="text-center py-8 hidden">
    <p class="text-secondary-600 dark:text-secondary-400">已加载全部内容</p>
  </div>
</div>

<script is:inline define:vars={{ itemsPerPage }}>
  let currentPage = 1;
  let isLoading = false;
  let hasMoreContent = true;

  async function fetchArticles(page = 1, append = false) {
    if (isLoading || (!append && !hasMoreContent)) {
      return;
    }
    
    isLoading = true;
    showLoading(true);
    
    try {
      const response = await fetch(`/api/articles?page=${page}&limit=${itemsPerPage}`);
      if (!response.ok) {
        throw new Error('获取文章数据失败');
      }
      
      const data = await response.json();
      renderArticles(data.articles, append);
      
      // 更新分页状态
      currentPage = data.pagination.current;
      hasMoreContent = data.pagination.hasNext;
      
      if (!hasMoreContent) {
        showEndMessage(true);
      }
    } catch (error) {
      const articleTimeline = document.getElementById('article-timeline');
      if (articleTimeline && !append) {
        articleTimeline.innerHTML = '<div class="text-center text-red-500 py-4">获取数据失败，请稍后再试</div>';
      }
    } finally {
      isLoading = false;
      showLoading(false);
    }
  }

  function renderArticles(articles, append = false) {
    const articleTimeline = document.getElementById('article-timeline');
    if (!articleTimeline) return;
    
    if (!articles || articles.length === 0) {
      if (!append) {
        articleTimeline.innerHTML = '<div class="text-center py-4 text-secondary-600 dark:text-secondary-400">暂无文章数据</div>';
      }
      return;
    }

    const articlesHTML = articles.map((article, index) => {
      const isEven = index % 2 === 0;
      return `
        <div class="relative group">
          <!-- 时间线节点 -->
          <div class="absolute left-5 -translate-x-1/2 md:left-1/2 top-6 flex h-3 w-3 items-center justify-center">
            <div class="h-2 w-2 rounded-full bg-primary-500 dark:bg-primary-400 ring-2 ring-white dark:ring-gray-900 ring-offset-2 ring-offset-white dark:ring-offset-gray-900"></div>
          </div>

          <!-- 文章卡片 -->
          <a href="/articles/${article.id}" 
             class="group/card ml-10 md:ml-0 ${isEven ? 'md:mr-[50%] md:pr-8' : 'md:ml-[50%] md:pl-8'} block">
            <article class="relative flex flex-col gap-4 rounded-xl bg-white dark:bg-gray-800 p-6 shadow-lg hover:shadow-xl hover:-translate-y-1 transition-all duration-300 border border-gray-200 dark:border-gray-700">
              <!-- 日期标签 -->
              <time datetime="${article.date}" 
                    class="absolute top-4 right-4 text-xs font-medium text-secondary-500 dark:text-secondary-400">
                ${new Date(article.date).toLocaleDateString('zh-CN', {year: 'numeric', month: 'long', day: 'numeric'})}
              </time>

              <!-- 文章标题 -->
              <h3 class="pr-16 text-xl font-bold text-gray-900 dark:text-gray-100 group-hover/card:text-primary-600 dark:group-hover/card:text-primary-400 transition-colors">
                ${article.title}
              </h3>

              <!-- 文章摘要 -->
              ${article.summary ? `
              <p class="text-secondary-600 dark:text-secondary-300 line-clamp-2">
                ${article.summary}
              </p>
              ` : ''}

              <!-- 文章元信息 -->
              <div class="flex flex-wrap items-center gap-4 text-sm">
                ${article.section ? `
                <span class="flex items-center text-secondary-500 dark:text-secondary-400">
                  <svg xmlns="http://www.w3.org/2000/svg" class="h-4 w-4 mr-1" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 7v10a2 2 0 002 2h14a2 2 0 002-2V9a2 2 0 00-2-2h-6l-2-2H5a2 2 0 00-2 2z" />
                  </svg>
                  ${article.section}
                </span>
                ` : ''}

                ${article.tags && article.tags.length > 0 ? `
                <div class="flex flex-wrap gap-2">
                  ${article.tags.map(tag => `
                    <span class="text-xs bg-primary-50 dark:bg-primary-900/30 text-primary-600 dark:text-primary-400 py-1 px-2 rounded-full">
                      #${tag}
                    </span>
                  `).join('')}
                </div>
                ` : ''}
              </div>

              <!-- 阅读更多指示器 -->
              <div class="flex items-center text-sm text-primary-600 dark:text-primary-400 group-hover/card:translate-x-1 transition-transform">
                <span class="font-medium">阅读全文</span>
                <svg xmlns="http://www.w3.org/2000/svg" class="h-4 w-4 ml-1" viewBox="0 0 20 20" fill="currentColor">
                  <path fill-rule="evenodd" d="M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z" clip-rule="evenodd" />
                </svg>
              </div>
            </article>
          </a>
        </div>
      `;
    }).join('');

    if (append) {
      articleTimeline.innerHTML += articlesHTML;
    } else {
      articleTimeline.innerHTML = articlesHTML;
    }
  }

  function showLoading(show) {
    const loading = document.getElementById('loading');
    if (loading) {
      if (show) {
        loading.classList.remove('hidden');
      } else {
        loading.classList.add('hidden');
      }
    }
  }

  function showEndMessage(show) {
    const endMessage = document.getElementById('end-message');
    if (endMessage) {
      endMessage.classList.toggle('hidden', !show);
    }
  }

  function setupInfiniteScroll() {
    // 直接使用滚动事件
    window.addEventListener('scroll', handleScroll);
    
    // 初始检查一次，以防内容不足一屏
    setTimeout(handleScroll, 500);
  }

  function handleScroll() {
    if (isLoading || !hasMoreContent) {
      return;
    }
    
    const scrollY = window.scrollY;
    const windowHeight = window.innerHeight;
    const documentHeight = document.documentElement.scrollHeight;
    
    // 当滚动到距离底部300px时加载更多
    if (scrollY + windowHeight >= documentHeight - 300) {
      fetchArticles(currentPage + 1, true);
    }
  }

  document.addEventListener('DOMContentLoaded', () => {
    fetchArticles(1, false).then(() => {
      setupInfiniteScroll();
    });
  });
</script>