import { 
  getNewestMovies, 
  getSeriesMovies, 
  getSingleMovies, 
  getCartoonMovies,
  getMoviesByCategory,
  getMoviesByCountry,
  getMoviesByTopic
} from '../../lib/api.js';

const fetchWithTimeout = async (url, options = {}) => {
  const { timeout = 5000 } = options;
  const controller = new AbortController();
  const id = setTimeout(() => controller.abort(), timeout);
  try {
    const response = await fetch(url, { ...options, signal: controller.signal });
    clearTimeout(id);
    return response;
  } catch (e) {
    clearTimeout(id);
    throw e;
  }
};

export const GET = async ({ url }) => {
  const type = url.searchParams.get('type') || '';
  const category = url.searchParams.get('category') || '';
  const country = url.searchParams.get('country') || '';
  const topic = url.searchParams.get('topic') || '';
  const keyword = url.searchParams.get('keyword') || url.searchParams.get('q') || '';
  const page = parseInt(url.searchParams.get('page') || '1');

  try {
    let result = { items: [] };
    
    if (keyword) {
      result = await import('../../lib/api.js').then(m => m.searchMovies(keyword, page));
    } else if (topic) {
      result = await getMoviesByTopic(topic, page);
    } else if (country) {
      result = await getMoviesByCountry(country, page);
    } else if (category) {
      if (category === 'phim-moi-cap-nhat') {
        result = await getNewestMovies(page);
      } else {
        result = await getMoviesByCategory(category, page);
      }
    } else if (type === 'newest') {
      result = await getNewestMovies(page);
    } else if (type === 'series') {
      result = await getSeriesMovies(page);
    } else if (type === 'single') {
      result = await getSingleMovies(page);
    } else if (type === 'cartoon') {
      result = await getCartoonMovies(page);
    }

    // FALLBACK SYSTEM: If less than 4 movies in local DB, fetch from public KKPhim API!
    if (!result.items || result.items.length < 4) {
      try {
        let fallbackUrl = '';
        if (country) {
          fallbackUrl = `https://phimapi.com/v1/api/quoc-gia/${country}?page=${page}`;
        } else if (category) {
          const defaultTypes = {
            'phim-bo': 'phim-bo',
            'phim-le': 'phim-le',
            'hoat-hinh': 'hoat-hinh',
            'tv-shows': 'tv-shows'
          };
          if (defaultTypes[category]) {
            fallbackUrl = `https://phimapi.com/v1/api/danh-sach/${defaultTypes[category]}?page=${page}`;
          } else if (category === 'phim-chieu-rap') {
            fallbackUrl = `https://phimapi.com/v1/api/the-loai/hanh-dong?page=${page}`;
          } else {
            fallbackUrl = `https://phimapi.com/v1/api/the-loai/${category}?page=${page}`;
          }
        } else if (type === 'newest') {
          fallbackUrl = `https://phimapi.com/danh-sach/phim-moi-cap-nhat?page=${page}`;
        } else if (type === 'series') {
          fallbackUrl = `https://phimapi.com/v1/api/danh-sach/phim-bo?page=${page}`;
        } else if (type === 'single') {
          fallbackUrl = `https://phimapi.com/v1/api/danh-sach/phim-le?page=${page}`;
        } else if (type === 'cartoon') {
          fallbackUrl = `https://phimapi.com/v1/api/danh-sach/hoat-hinh?page=${page}`;
        }

        if (fallbackUrl) {
          const res = await fetchWithTimeout(fallbackUrl);
          if (res.ok) {
            const data = await res.json();
            let items = [];
            if (fallbackUrl.includes('danh-sach/phim-moi-cap-nhat')) {
              items = data.items || [];
            } else if (data.data && data.data.items) {
              items = data.data.items || [];
            }
            
            const mapped = items.map(item => ({
              _id: item._id,
              name: item.name,
              slug: item.slug,
              origin_name: item.origin_name,
              thumb_url: item.thumb_url,
              poster_url: item.poster_url,
              year: item.year,
              quality: item.quality || 'FHD',
              lang: item.lang || 'Vietsub',
              episode_current: item.episode_current || 'Tập 1',
              type: item.type || 'single',
              isLocal: false
            }));

            const localItems = result.items || [];
            const mergedItems = [...localItems];
            
            for (const item of mapped) {
              if (!mergedItems.some(x => x.slug === item.slug)) {
                mergedItems.push(item);
              }
            }

            result.items = mergedItems.slice(0, 12);
          }
        }
      } catch (err) {
        console.error('[API FALLBACK ERROR]', err);
      }
    }

    return new Response(JSON.stringify(result), {
      status: 200,
      headers: { 'Content-Type': 'application/json' }
    });
  } catch (err) {
    console.error('Error fetching movies API:', err);
    return new Response(JSON.stringify({ error: err.message, items: [] }), {
      status: 500,
      headers: { 'Content-Type': 'application/json' }
    });
  }
};