/*
  API — two upstreams:
    1. the bug-tv REST server (SR.config.getBase()): provider catalog,
       /streams lookup, and the /proxy/media tunnel the player needs (CORS,
       headers, m3u8 rewrite).
    2. TMDB, called straight from the browser (it is CORS-enabled): search,
       trending, details, seasons, episodes. Each returns the same shape the
       server's endpoints used to, so the pages are unchanged.

  Keeping catalog traffic off the server means it only does provider scraping
  and stream proxying.
*/
(function () {
  'use strict';

  const TMDB_BASE = 'https://api.themoviedb.org/3';
  const TMDB_IMG = 'https://image.tmdb.org/t/p/';

  async function request(path, params) {
    const url = new URL(SR.config.getBase() + path);
    if (params) {
      for (const [key, value] of Object.entries(params)) {
        if (value === undefined || value === null || value === '') continue;
        url.searchParams.set(key, String(value));
      }
    }
    let res;
    try {
      res = await fetch(url.toString());
    } catch (e) {
      throw new Error(`cannot reach the API at ${SR.config.getBase()} — check the base URL in Settings`);
    }
    let data = null;
    try {
      data = await res.json();
    } catch (e) {
      /* non-JSON body */
    }
    if (!res.ok) {
      throw new Error((data && data.error) || `API error: HTTP ${res.status}`);
    }
    return data;
  }

  // Direct TMDB call. `key` overrides the configured key (Settings "Test").
  async function tmdb(pathname, params, key) {
    const url = new URL(TMDB_BASE + pathname);
    url.searchParams.set('api_key', key || SR.config.getTmdbKey());
    url.searchParams.set('language', 'en-US');
    if (params) {
      for (const [k, v] of Object.entries(params)) {
        if (v === undefined || v === null || v === '') continue;
        url.searchParams.set(k, String(v));
      }
    }
    let res;
    try {
      res = await fetch(url.toString());
    } catch (e) {
      throw new Error('cannot reach the TMDB API — check your connection or the TMDB API key in Settings');
    }
    let data = null;
    try {
      data = await res.json();
    } catch (e) {
      /* non-JSON body */
    }
    if (!res.ok) {
      if (res.status === 401) {
        throw new Error('TMDB rejected the API key — check "TMDB API key" in Settings');
      }
      throw new Error((data && (data.status_message || data.error)) || `TMDB error: HTTP ${res.status}`);
    }
    return data;
  }

  // route a media/subtitle URL through the API proxy (CORS, headers, m3u8 rewrite)
  function proxyUrl(target, headers) {
    const q = new URLSearchParams();
    q.set('url', target);
    q.set('h', JSON.stringify(headers || {}));
    return SR.config.getBase() + '/proxy/media?' + q.toString();
  }

  // Same shapes the server endpoints used to return.
  function searchResult(m) {
    const isTv = m.media_type === 'tv';
    const date = isTv ? m.first_air_date : m.release_date;
    return {
      tmdb_id: m.id,
      type: isTv ? 'tv' : 'movie',
      name: m.title || m.name,
      year: date ? String(date).slice(0, 4) : '',
      poster: m.poster_path ? `${TMDB_IMG}w342${m.poster_path}` : '',
      backdrop: m.backdrop_path ? `${TMDB_IMG}w1280${m.backdrop_path}` : '',
      rating: m.vote_average ? Number(m.vote_average).toFixed(1) : '',
      overview: m.overview || '',
    };
  }

  function fullImage(pathname) {
    return pathname ? `${TMDB_IMG}original${pathname}` : '';
  }

  window.SR = window.SR || {};
  SR.api = {
    request,
    tmdb,
    proxyUrl,

    // — TMDB, straight from the browser —
    search: (q) =>
      tmdb('/search/multi', { query: q, include_adult: 'false', page: 1 }).then((r) => {
        const results = (r.results || [])
          .filter((m) => m.media_type === 'movie' || m.media_type === 'tv')
          .slice(0, 15)
          .map(searchResult);
        return { query: q, count: results.length, results };
      }),
    trending: (type, timeWindow) => {
      const t = ['movie', 'tv', 'all'].includes(type) ? type : 'all';
      const w = timeWindow === 'day' ? 'day' : 'week';
      return tmdb(`/trending/${t}/${w}`).then((r) => {
        const results = (r.results || []).slice(0, 20).map(searchResult);
        return { type: t, window: w, count: results.length, results };
      });
    },
    details: (type, id) =>
      tmdb(`/${type}/${id}`, { append_to_response: 'images' }).then((d) => {
        d.poster_url = fullImage(d.poster_path);
        d.backdrop_url = fullImage(d.backdrop_path);
        if (d.images) {
          for (const key of Object.keys(d.images)) {
            d.images[key] = (d.images[key] || []).map((im) => ({ ...im, url: fullImage(im.file_path) }));
          }
        }
        return d;
      }),
    seasons: (id) =>
      tmdb(`/tv/${id}`).then((r) => {
        const seasons = (r.seasons || [])
          .filter((s) => s.season_number > 0 && (s.episode_count || 0) > 0)
          .map((s) => ({
            season_number: s.season_number,
            name: s.name,
            episode_count: s.episode_count,
            air_date: s.air_date || '',
          }));
        return { tmdb_id: id, count: seasons.length, seasons };
      }),
    episodes: (id, season) =>
      tmdb(`/tv/${id}/season/${season}`).then((r) => {
        const episodes = (r.episodes || [])
          .slice()
          .sort((a, b) => a.episode_number - b.episode_number)
          .map((e) => ({
            episode_number: e.episode_number,
            name: e.name,
            air_date: e.air_date || '',
            still: e.still_path ? `${TMDB_IMG}w300${e.still_path}` : '',
          }));
        return { tmdb_id: id, season: parseInt(season, 10), count: episodes.length, episodes };
      }),

    // — bug-tv server (providers, streams, proxy) —
    streams: ({ tmdb, type, season, episode, providers }) =>
      request('/streams', {
        tmdb,
        type,
        season,
        episode,
        providers: Array.isArray(providers) && providers.length ? providers.join(',') : '',
      }),
    providers: () => request('/providers'),
  };
})();