import { useState } from 'react';
import { useQuery } from '@tanstack/react-query';
import { supabase } from '@/lib/supabaseClient';
import { BlogPostCard } from '@/components/blog/BlogPostCard';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Search, ChevronLeft, ChevronRight } from 'lucide-react';
import { Skeleton } from '@/components/ui/skeleton';
import { Header } from '@/components/layout/Header';
import { Footer } from '@/components/layout/Footer';
import { useDocumentTitle } from '@/hooks/useDocumentTitle';
import { useOpenGraph } from '@/hooks/useOpenGraph';

const POSTS_PER_PAGE = 9;

export default function BlogIndex() {
  useDocumentTitle('Blog');
  const [page, setPage] = useState(1);
  const [searchQuery, setSearchQuery] = useState('');

  const { data, isLoading } = useQuery({
    queryKey: ['blog-posts', page, searchQuery],
    queryFn: async () => {
      let query = supabase
        .from('blog_posts')
        .select('*, profiles!inner(username, display_name, avatar_url)', { count: 'exact' })
        .eq('status', 'published')
        .order('published_at', { ascending: false })
        .range((page - 1) * POSTS_PER_PAGE, page * POSTS_PER_PAGE - 1);

      if (searchQuery) {
        query = query.or(`title.ilike.%${searchQuery}%,content.ilike.%${searchQuery}%`);
      }

      const { data: posts, count, error } = await query;
      if (error) throw error;
      return { posts, totalCount: count || 0 };
    },
  });

  const totalPages = Math.ceil((data?.totalCount || 0) / POSTS_PER_PAGE);

  useOpenGraph({
    title: 'Blog - ThrillWiki',
    description: searchQuery 
      ? `Search results for "${searchQuery}" in ThrillWiki Blog` 
      : 'News, updates, and stories from the world of theme parks and roller coasters',
    imageUrl: data?.posts?.[0]?.featured_image_url ?? undefined,
    imageId: data?.posts?.[0]?.featured_image_id ?? undefined,
    type: 'website',
    enabled: !isLoading
  });

  return (
    <div className="min-h-screen bg-background">
      <Header />
      
      <div className="container mx-auto px-4 py-12 max-w-7xl">
        <div className="text-center mb-12">
          <h1 className="text-5xl font-bold mb-4">ThrillWiki Blog</h1>
          <p className="text-xl text-muted-foreground max-w-2xl mx-auto">
            Latest news, updates, and stories from the world of theme parks and roller coasters
          </p>
        </div>

        <div className="max-w-md mx-auto mb-12">
          <div className="relative">
            <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
            <Input
              placeholder="Search blog posts..."
              value={searchQuery}
              onChange={(e) => {
                setSearchQuery(e.target.value);
                setPage(1);
              }}
              className="pl-10"
            />
          </div>
        </div>

        {isLoading ? (
          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
            {[...Array(6)].map((_, i) => (
              <Skeleton key={i} className="h-[400px] rounded-lg" />
            ))}
          </div>
        ) : data?.posts.length === 0 ? (
          <div className="text-center py-12">
            <p className="text-muted-foreground">No blog posts found.</p>
          </div>
        ) : (
          <>
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
              {data?.posts.map((post) => (
                <BlogPostCard
                  key={post.id}
                  slug={post.slug}
                  title={post.title}
                  content={post.content}
                  featuredImageId={post.featured_image_id ?? undefined}
                  author={{
                    username: post.profiles.username,
                    displayName: post.profiles.display_name ?? undefined,
                    avatarUrl: post.profiles.avatar_url ?? undefined,
                  }}
                  publishedAt={post.published_at!}
                  viewCount={post.view_count ?? 0}
                />
              ))}
            </div>

            {totalPages > 1 && (
              <div className="flex items-center justify-center gap-2 mt-12">
                <Button
                  variant="outline"
                  size="sm"
                  onClick={() => setPage(p => Math.max(1, p - 1))}
                  disabled={page === 1}
                >
                  <ChevronLeft className="w-4 h-4" />
                  Previous
                </Button>
                <span className="text-sm text-muted-foreground">
                  Page {page} of {totalPages}
                </span>
                <Button
                  variant="outline"
                  size="sm"
                  onClick={() => setPage(p => Math.min(totalPages, p + 1))}
                  disabled={page === totalPages}
                >
                  Next
                  <ChevronRight className="w-4 h-4" />
                </Button>
              </div>
            )}
          </>
        )}
      </div>

      <Footer />
    </div>
  );
}
