import BlogPage from "../../components/BlogPage";
import type { Metadata } from 'next';
import { getPageMetadata } from "../../lib/seo";

export async function generateMetadata(): Promise<Metadata> {
  return getPageMetadata('blog', {
    canonicalPath: '/blog',
    fallbackTitle: 'مجله سلامت و دانشنامه مقالات تخصصی پت',
    fallbackDesc: 'جدیدترین مقالات علمی، راهنمای تغذیه، بیماری‌های سگ و گربه و توصیه‌های بالینی متخصصان و دامپزشکان کنینا.',
  });
}

export const revalidate = 3600;

async function getCategories() {
  const apiUrl = process.env.INTERNAL_API_URL || process.env.NEXT_PUBLIC_API_URL || 'http://localhost:4001/api';
  const apiBase = apiUrl.endsWith('/api') ? apiUrl : `${apiUrl.replace(/\/$/, '')}/api`;
  try {
    const res = await fetch(`${apiBase}/blogs/categories`, {
      next: { tags: ['blogs', 'blog-categories'], revalidate: 3600 },
    });
    if (!res.ok) return [];
    const json = await res.json();
    return json.data || json || [];
  } catch (err) {
    console.error('[Blog] Error fetching categories:', err);
    return [];
  }
}

async function getBlogs() {
  const apiUrl = process.env.INTERNAL_API_URL || process.env.NEXT_PUBLIC_API_URL || 'http://localhost:4001/api';
  const apiBase = apiUrl.endsWith('/api') ? apiUrl : `${apiUrl.replace(/\/$/, '')}/api`;
  try {
    const res = await fetch(`${apiBase}/blogs?limit=50`, {
      next: { tags: ['blogs'], revalidate: 3600 },
    });
    if (!res.ok) {
      console.error(`[Blog] Failed to fetch blogs: ${res.status}`);
      return [];
    }
    const data = await res.json();
    const list = Array.isArray(data.data) ? data.data : Array.isArray(data) ? data : [];
    return list.map((b: any) => {
      const authorObj = b.author as Record<string, string> | undefined;
      const authorName = authorObj ? `${authorObj.firstName || ''} ${authorObj.lastName || ''}`.trim() : 'نویسنده کنینا';
      return {
        id: String(b.id || ''),
        slug: String(b.slug || ''),
        title: String(b.title || ''),
        excerpt: String(b.excerpt || b.metaDescription || (typeof b.content === 'string' ? b.content.substring(0, 150).replace(/<[^>]+>/g, '') + '...' : '')),
        category: b.category?.name || 'دانشنامه و سلامت',
        categoryId: b.categoryId || undefined,
        tags: b.tags || [],
        date: b.publishedAt
          ? new Date(String(b.publishedAt)).toLocaleDateString('fa-IR')
          : b.createdAt
          ? new Date(String(b.createdAt)).toLocaleDateString('fa-IR')
          : '',
        readingTime: b.readingTime || 3,
        image: String(b.imageUrl || b.coverImage || '/assets/images/blog-placeholder.png'),
        imageAlt: b.imageAlt || b.title,
        author: authorName || 'نویسنده کنینا',
        content: String(b.content || ''),
        featured: Boolean(b.featured),
        viewCount: Number(b.viewCount) || 0,
      };
    });
  } catch (error) {
    console.error('[Blog] Error fetching blogs:', error);
    return [];
  }
}

export default async function Blog() {
  const [blogs, categories] = await Promise.all([getBlogs(), getCategories()]);
  return <BlogPage blogs={blogs} categories={categories} />;
}