import { useEffect, useState } from 'react';
import HeroSection from '../components/HeroSection';
import ContentRow from '../components/ContentRow';
import { getRecentItems, getGenreCategories, getGenresItems, getMovieCard, getTvShowCard } from '../lib/api';
import { useToast } from '@/hooks/use-toast';

// GenreRow component for dynamic loading of a genre row
const GenreRow = ({ genre, type }) => {
  const [loading, setLoading] = useState(true);
  const [items, setItems] = useState([]);
  const { toast } = useToast();

  useEffect(() => {
    const fetchGenreData = async () => {
      try {
        // Fetch titles for the given genre and type
        const genreItems = await getGenresItems([genre], type, 10, 1);
        const titles =
          type === "movie"
            ? (genreItems && Array.isArray(genreItems.movies)
                ? genreItems.movies.map(item => item.title)
                : [])
            : (genreItems && Array.isArray(genreItems.series)
                ? genreItems.series.map(item => item.title)
                : []);
        if (titles.length === 0) {
          setLoading(false);
          return;
        }

        // For each title, fetch the card details
        const fetchCard = async (title) => {
          try {
            if (type === "movie") {
              const movieInfo = await getMovieCard(title);
              if (movieInfo) {
                return {
                  type: 'movie',
                  title,
                  image: movieInfo.image,
                  description: movieInfo.overview,
                  genre: movieInfo.genres?.map((g) => g.name) || [],
                  year: movieInfo.year
                };
              }
            } else {
              const showInfo = await getTvShowCard(title);
              if (showInfo) {
                return {
                  type: 'tvshow',
                  title,
                  image: showInfo.image,
                  description: showInfo.overview,
                  genre: showInfo.genres?.map((g) => g.name) || [],
                  year: showInfo.year
                };
              }
            }
          } catch (error) {
            console.error(`Error fetching card for ${title}:`, error);
            return null;
          }
          return null;
        };

        const cardPromises = titles.map((title) => fetchCard(title));
        const cards = await Promise.all(cardPromises);
        setItems(cards.filter(item => item !== null));
      } catch (error) {
        console.error(`Error fetching ${type} items for genre ${genre}:`, error);
        toast({
          title: `Error loading ${type} items`,
          description: `Failed to load ${genre} ${type} items`,
          variant: "destructive"
        });
      } finally {
        setLoading(false);
      }
    };

    fetchGenreData();
  }, [genre, type, toast]);

  // While data is being fetched, show a simple loader in place of the row
  if (loading) {
    return (
      <div className="px-4 md:px-8 py-8">
        <h2 className="text-xl font-bold mb-4">{genre} {type === "movie" ? "Movies" : "Shows"}</h2>
        <div className="flex items-center justify-center h-32">
          <div className="animate-spin rounded-full h-8 w-8 border-t-2 border-b-2 border-netflix-red"></div>
        </div>
      </div>
    );
  }

  // If no items were found, render nothing
  if (items.length === 0) return null;

  return (
    <ContentRow title={`${genre} ${type === "movie" ? "Movies" : "Shows"}`} items={items} />
  );
};

const HomePage = () => {
  const [loading, setLoading] = useState(true);
  const [heroContent, setHeroContent] = useState(null);
  const [recentContent, setRecentContent] = useState([]);
  const [genres, setGenres] = useState([]);
  const { toast } = useToast();

  useEffect(() => {
    const fetchHomeData = async () => {
      try {
        setLoading(true);

        // Fetch recent items for hero and recent content row
        const recentItems = await getRecentItems(10);
        if (recentItems && recentItems.length > 0) {
          setHeroContent(recentItems[0]);
          setRecentContent(recentItems);
        }

        // Fetch all genre categories (movies and shows together)
        const genresRes = await getGenreCategories();
        console.log("Fetched genres:", genresRes);

        const allGenres = Array.isArray(genresRes)
          ? genresRes.map((g) => g.name)
          : genresRes.genres
          ? genresRes.genres.map((g) => g.name)
          : [];
        console.log("All genres:", allGenres);
        setGenres(allGenres);
      } catch (error) {
        console.error("Error fetching home page data:", error);
        toast({
          title: "Error loading content",
          description: "Please try again later",
          variant: "destructive"
        });
      } finally {
        setLoading(false);
      }
    };

    fetchHomeData();
  }, [toast]);

  if (loading) {
    return (
      <div className="flex items-center justify-center min-h-screen">
        <div className="animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-netflix-red"></div>
      </div>
    );
  }

  return (
    <div>
      {/* Hero Section */}
      {heroContent && (
        <HeroSection 
          type={heroContent.type}
          title={heroContent.title}
          description={heroContent.description}
          backdrop={heroContent.image}
          genre={heroContent.genre}
          year={heroContent.year}
        />
      )}

      <div className="mt-8">
        {/* Recent Content Row */}
        <ContentRow title="Recent Additions" items={recentContent} />

        {/* Render genre rows dynamically */}
        {genres.map((genre) => (
          <div key={genre}>
            <GenreRow genre={genre} type="movie" />
            <GenreRow genre={genre} type="series" />
          </div>
        ))}
      </div>
    </div>
  );
};

export default HomePage;