---
/**
 * News/Blog Listing Page - 行銷放大鏡
 * URL: /news
 * Displays all published blog posts from Payload CMS
 */
import Layout from '../layouts/Layout.astro'
import ArticleCard from '../components/blog/ArticleCard.astro'
import CategoryFilter from '../components/blog/CategoryFilter.astro'
import { fetchPosts, fetchCategories } from '../lib/api/blog'

// Metadata for SEO
const title = '行銷放大鏡 | 恩群數位行銷'
const description = '閱讀恩群數位的專業行銷文章，掌握最新的數位行銷趨勢、社群經營技巧、Google 廣告策略等實用內容。'

// Pagination settings
const PAGE_SIZE = 12

// Get query parameters
const url = Astro.url
const pageParam = url.searchParams.get('page')
const page = Math.max(1, parseInt(pageParam || '1'))

// Fetch posts from Payload CMS
const postsData = await fetchPosts(page, PAGE_SIZE)
const posts = postsData.docs
const totalPages = postsData.totalPages
const hasPreviousPage = postsData.hasPreviousPage
const hasNextPage = postsData.hasNextPage

// Fetch categories
const categories = await fetchCategories()

// Filter out categories without slugs and the legacy "文章分類" container
const validCategories = categories.filter(c =>
  c.slug && c.slug !== 'wen-zhang-fen-lei'
)
---

<Layout title={title} description={description}>
  <!-- Blog Hero Section -->
  <section class="blog-hero" aria-labelledby="blog-heading">
    <div class="container">
      <div class="section_header_w_line">
        <div class="divider_line"></div>
        <div class="header_subtitle">
          <h2 id="blog-heading" class="header_subtitle_head">行銷放大鏡</h2>
          <p class="header_subtitle_paragraph">Marketing Blog</p>
        </div>
        <div class="divider_line"></div>
      </div>
    </div>
  </section>

  <!-- Category Filter -->
  <section class="filter-section">
    <div class="container">
      <CategoryFilter categories={validCategories} />
    </div>
  </section>

  <!-- Blog Posts Grid -->
  <section class="blog-section" aria-label="文章列表">
    <div class="container">
      {
        posts.length > 0 ? (
          <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6 mb-10 w-full max-w-[1200px] mx-auto">
            {posts.map((post) => (
              <ArticleCard post={post} />
            ))}
          </div>
        ) : (
          <div class="empty-state">
            <p class="empty-text">暫無文章</p>
          </div>
        )
      }

      <!-- Pagination -->
      {
        totalPages > 1 && (
          <nav class="pagination" aria-label="分頁導航">
            <div class="pagination-container">
              {
                hasPreviousPage && (
                  <a
                    href={`?page=${page - 1}`}
                    class="pagination-link pagination-link-prev"
                    aria-label="上一頁"
                  >
                    <svg viewBox="0 0 24 24" width="20" height="20" fill="currentColor">
                      <path d="M15.41 7.41L14 6l-6 6 6 6 1.41-1.41L10.83 12z"/>
                    </svg>
                    上一頁
                  </a>
                )
              }

              <div class="pagination-info">
                <span class="current-page">{page}</span>
                <span class="page-separator">/</span>
                <span class="total-pages">{totalPages}</span>
              </div>

              {
                hasNextPage && (
                  <a
                    href={`?page=${page + 1}`}
                    class="pagination-link pagination-link-next"
                    aria-label="下一頁"
                  >
                    下一頁
                    <svg viewBox="0 0 24 24" width="20" height="20" fill="currentColor">
                      <path d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/>
                    </svg>
                  </a>
                )
              }
            </div>
          </nav>
        )
      }
    </div>
  </section>
</Layout>

<style>
  /* Blog Hero Section */
  .blog-hero {
    padding: 60px 20px;
    background-color: #ffffff;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
  }

  .section_header_w_line {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
  }

  .header_subtitle {
    text-align: center;
  }

  .header_subtitle_head {
    color: var(--color-enchunblue, #23608c);
    font-family: "Noto Sans TC", sans-serif;
    font-weight: 700;
    font-size: 2rem;
    margin-bottom: 8px;
  }

  .header_subtitle_paragraph {
    color: var(--color-gray-600, #666);
    font-family: "Quicksand", "Noto Sans TC", sans-serif;
    font-weight: 400;
    font-size: 1rem;
  }

  .divider_line {
    width: 40px;
    height: 2px;
    background-color: var(--color-enchunblue, #23608c);
  }

  /* Filter Section */
  .filter-section {
    background-color: #ffffff;
    padding-bottom: 20px;
  }

  /* Blog Section */
  .blog-section {
    padding: 40px 20px 60px;
    background-color: #f8f9fa;
    min-height: 60vh;
  }

  /* Empty State */
  .empty-state {
    text-align: center;
    padding: 80px 20px;
  }

  .empty-text {
    font-size: 1.125rem;
    color: var(--color-gray-500, #999);
  }

  /* Pagination */
  .pagination {
    padding-top: 20px;
  }

  .pagination-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
  }

  .pagination-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: #ffffff;
    border: 2px solid var(--color-gray-300, #e0e0e0);
    border-radius: 8px;
    color: var(--color-gray-700, #555);
    font-family: "Noto Sans TC", sans-serif;
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.25s ease;
  }

  .pagination-link:hover {
    border-color: var(--color-enchunblue, #23608c);
    color: var(--color-enchunblue, #23608c);
    background: rgba(35, 96, 140, 0.05);
  }

  .pagination-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: "Quicksand", sans-serif;
    font-size: 1rem;
    color: var(--color-gray-600, #666);
  }

  .current-page {
    font-weight: 700;
    color: var(--color-enchunblue, #23608c);
  }

  .page-separator {
    color: var(--color-gray-400, #ccc);
  }

  /* Responsive Adjustments */
  @media (max-width: 991px) {
    .header_subtitle_head {
      font-size: 1.75rem;
    }
  }

  @media (max-width: 767px) {
    .blog-hero {
      padding: 40px 16px;
    }

    .section_header_w_line {
      flex-wrap: wrap;
      gap: 12px;
    }

    .divider_line {
      width: 30px;
    }

    .blog-section {
      padding: 30px 16px 50px;
    }

    .pagination-container {
      gap: 16px;
    }

    .pagination-link {
      padding: 8px 16px;
      font-size: 0.875rem;
    }

    .header_subtitle_head {
      font-size: 1.5rem;
    }

    .header_subtitle_paragraph {
      font-size: 0.9375rem;
    }
  }
</style>