---
/**
 * Blog Article Detail Page - 行銷放大鏡文章詳情
 * URL: /xing-xiao-fang-da-jing/[slug]
 * Fetches from Payload CMS and renders with Lexical content
 */
import Layout from '../../layouts/Layout.astro'
import RelatedPosts from '../../components/blog/RelatedPosts.astro'
import { fetchPostBySlug, fetchRelatedPosts, formatDate } from '../../lib/api/blog'
import { serializeLexical } from '../../lib/serializeLexical'

// Get slug from params
const { slug } = Astro.params

// Validate slug
if (!slug) {
  return Astro.redirect('/404')
}

// Fetch post by slug
const post = await fetchPostBySlug(slug)

// Handle 404 for non-existent or unpublished posts
if (!post) {
  return Astro.redirect('/404')
}

// Fetch related posts
const categorySlugs = post.categories?.map(c => c.slug) || []
const relatedPosts = await fetchRelatedPosts(post.id, categorySlugs, 4)

// Format date
const displayDate = formatDate(post.publishedAt)

// Get primary category
const category = post.categories?.[0]

// Serialize Lexical content to HTML (must await the async function)
const contentHtml = await serializeLexical(post.content)

// SEO metadata
const metaTitle = post.meta?.title || post.title
const metaDescription = post.meta?.description || post.excerpt || ''
const metaImage = post.meta?.image?.url || post.ogImage?.url || post.heroImage?.url || ''
---

<Layout title={metaTitle} description={metaDescription}>
  <article class="article-detail">
    <!-- Article Header -->
    <header class="article-header">
      <div class="container">
        <!-- Category Badge -->
        {
          category && (
            <span
              class="article-category"
              style={`background-color: ${category.backgroundColor || 'var(--color-enchunblue)'}; color: ${category.textColor || '#fff'}`}
            >
              {category.title}
            </span>
          )
        }

        <!-- Article Title -->
        <h1 class="article-title">
          {post.title}
        </h1>

        <!-- Published Date -->
        {
          displayDate && (
            <time class="article-date" datetime={post.publishedAt || post.createdAt}>
              {displayDate}
            </time>
          )
        }
      </div>
    </header>

    <!-- Hero Image -->
    {
      post.heroImage?.url && (
        <div class="article-hero-image">
          <img
            src={post.heroImage.url}
            alt={post.heroImage.alt || post.title}
            loading="eager"
            width="1200"
            height="675"
          />
        </div>
      )
    }

    <!-- Article Content -->
    <div class="article-content">
      <div class="container">
        <div class="content-wrapper">
          <!-- Render rich text content with Lexical to HTML conversion -->
          <div class="prose" set:html={contentHtml} />
        </div>
      </div>
    </div>

    <!-- Back to List Button -->
    <div class="article-actions">
      <div class="container">
        <a href="/news" class="back-button">
          <svg viewBox="0 0 24 24" width="20" height="20" fill="currentColor">
            <path d="M20 11H7.83l5.59-5.59L12 4l-8 8 8 8 1.41-1.41L7.83 13H20v-2z"/>
          </svg>
          回到文章列表
        </a>
      </div>
    </div>
  </article>

  <!-- Related Posts Section -->
  <RelatedPosts posts={relatedPosts} />
</Layout>

<!-- Open Graph Tags -->
<script define:vars={{ metaImage, metaTitle, metaDescription }}>
  if (typeof document !== 'undefined') {
    // Update OG image
    const ogImage = document.querySelector('meta[property="og:image"]')
    if (ogImage && metaImage) {
      ogImage.setAttribute('content', metaImage)
    }

    // Update OG title
    const ogTitle = document.querySelector('meta[property="og:title"]')
    if (ogTitle) {
      ogTitle.setAttribute('content', metaTitle)
    }

    // Update OG description
    const ogDesc = document.querySelector('meta[property="og:description"]')
    if (ogDesc) {
      ogDesc.setAttribute('content', metaDescription)
    }
  }
</script>

<style>
  /* Article Header */
  .article-header {
    padding: 60px 20px 40px;
    text-align: center;
    background-color: #ffffff;
  }

  .container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .article-category {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
  }

  .article-title {
    font-family: "Noto Sans TC", sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-dark-blue, #1a1a1a);
    line-height: 1.3;
    margin-bottom: 1rem;
  }

  .article-date {
    font-family: "Quicksand", "Noto Sans TC", sans-serif;
    font-size: 1rem;
    color: var(--color-gray-500, #999);
  }

  /* Hero Image */
  .article-hero-image {
    max-width: 1200px;
    margin: 0 auto;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-gray-100, #f5f5f5);
  }

  .article-hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  /* Article Content */
  .article-content {
    padding: 60px 20px;
    background-color: #ffffff;
  }

  .content-wrapper {
    max-width: 720px;
    margin: 0 auto;
  }

  /* Prose styles for rich text content */
  .prose {
    font-family: "Noto Sans TC", sans-serif;
    color: var(--color-gray-700, #333);
    line-height: 1.8;
  }

  .prose :global(h1),
  .prose :global(h2),
  .prose :global(h3),
  .prose :global(h4) {
    font-weight: 700;
    color: var(--color-dark-blue, #1a1a1a);
    margin-top: 2rem;
    margin-bottom: 1rem;
    line-height: 1.3;
  }

  .prose :global(h1) { font-size: 2rem; }
  .prose :global(h2) { font-size: 1.75rem; }
  .prose :global(h3) { font-size: 1.5rem; }
  .prose :global(h4) { font-size: 1.25rem; }

  .prose :global(p) {
    margin-bottom: 1.25rem;
    font-size: 1.0625rem;
  }

  .prose :global(a) {
    color: var(--color-enchunblue, #23608c);
    text-decoration: underline;
    text-underline-offset: 2px;
  }

  .prose :global(a:hover) {
    color: var(--color-enchunblue-hover, #1a4d6e);
  }

  .prose :global(img) {
    border-radius: 8px;
    margin: 2rem 0;
    max-width: 100%;
    height: auto;
  }

  .prose :global(ul),
  .prose :global(ol) {
    padding-left: 1.5rem;
    margin-bottom: 1.25rem;
  }

  .prose :global(li) {
    margin-bottom: 0.5rem;
  }

  .prose :global(blockquote) {
    border-left: 4px solid var(--color-enchunblue, #23608c);
    padding-left: 1rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--color-gray-600, #666);
  }

  .prose :global(code) {
    background: var(--color-gray-100, #f5f5f5);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.9em;
  }

  .prose :global(pre) {
    background: var(--color-dark-blue, #1a1a1a);
    color: #fff;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 2rem 0;
  }

  .prose :global(pre code) {
    background: transparent;
    color: inherit;
  }

  /* Article Actions */
  .article-actions {
    padding: 20px;
    background-color: #f8f9fa;
  }

  .back-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    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;
  }

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

  /* Responsive Adjustments */
  @media (max-width: 991px) {
    .article-title {
      font-size: 2rem;
    }
  }

  @media (max-width: 767px) {
    .article-header {
      padding: 40px 16px 30px;
    }

    .article-title {
      font-size: 1.75rem;
    }

    .article-hero-image {
      aspect-ratio: 4 / 3;
    }

    .article-content {
      padding: 40px 16px;
    }

    .content-wrapper {
      padding: 0;
    }

    .prose :global(h1) { font-size: 1.75rem; }
    .prose :global(h2) { font-size: 1.5rem; }
    .prose :global(h3) { font-size: 1.25rem; }
    .prose :global(p) {
      font-size: 1rem;
    }
  }
</style>