// The Bazarr API client — bazarr's own code, living in the module (novox/hq ADR 0044). Bazarr
// manages subtitles for a Sonarr/Radarr library: it tracks which episodes and movies are still
// missing subtitles, searches providers for them, and records what it downloaded. This client
// talks its /api surface (keyed by an X-API-KEY header); bazarr's tools and events import it.

export interface WantedSubtitle {
  kind: "episode" | "movie";
  title: string; // series + episode, or movie title
  path?: string;
  seriesId?: number; // sonarr series id (episodes)
  episodeId?: number; // sonarr episode id (episodes)
  radarrId?: number; // radarr movie id (movies)
  missing: string[]; // language names still missing
}

export interface ProviderSubtitle {
  provider: string;
  language: string;
  hearingImpaired: boolean;
  forced: boolean;
  score?: number;
  release?: string;
  subtitle: string; // the opaque token Bazarr uses to download this exact result
}

export interface HistoryEntry {
  kind: "episode" | "movie";
  id: string; // stable dedup key across polls
  title: string;
  language?: string;
  provider?: string;
  path?: string;
  timestamp?: string;
  description?: string;
}

export class BazarrClient {
  readonly baseUrl: string;

  constructor(
    url: string,
    private readonly apiKey: string,
  ) {
    this.baseUrl = url.replace(/\/$/, "");
  }

  /** Build from the module's resolved environment. Bazarr's API is keyed; without URL and key
   *  there is nothing to talk to, so this throws rather than run half-configured. */
  static fromEnv(env: NodeJS.ProcessEnv = process.env): BazarrClient {
    const url = env.MESH_BAZARR_URL;
    const apiKey = env.MESH_BAZARR_API_KEY;
    if (!url) throw new Error("no Bazarr URL — set MESH_BAZARR_URL");
    if (!apiKey) throw new Error("no Bazarr API key — set MESH_BAZARR_API_KEY");
    return new BazarrClient(url, apiKey);
  }

  private async request(method: string, path: string, params: Record<string, string> = {}): Promise<any> {
    const url = new URL(`${this.baseUrl}/api${path}`);
    for (const [k, v] of Object.entries(params)) url.searchParams.set(k, v);
    const res = await fetch(url.toString(), { method, headers: { "X-API-KEY": this.apiKey, Accept: "application/json" } });
    if (!res.ok) throw new Error(`Bazarr API ${method} ${path}: ${res.status} ${await res.text()}`);
    // Downloads/patches return an empty body; only GETs carry JSON.
    const text = await res.text();
    return text ? JSON.parse(text) : {};
  }

  private get(path: string, params?: Record<string, string>): Promise<any> {
    return this.request("GET", path, params);
  }

  private languageNames(missing: any[]): string[] {
    return (missing ?? []).map((m: any) => m?.name ?? m?.code2 ?? m?.code3).filter(Boolean);
  }

  /** Episodes and movies still missing subtitles — Bazarr's core "what's left to do" list. */
  async getWanted(limit = 50): Promise<WantedSubtitle[]> {
    const [eps, movies] = await Promise.all([
      this.get("/episodes/wanted", { start: "0", length: String(limit) }),
      this.get("/movies/wanted", { start: "0", length: String(limit) }),
    ]);
    const episodes: WantedSubtitle[] = (eps?.data ?? []).map((e: any) => ({
      kind: "episode" as const,
      title: `${e.seriesTitle ?? e.series ?? "Unknown"} — ${e.episodeTitle ?? e.episode_title ?? ""}`.trim(),
      path: e.path,
      seriesId: e.sonarrSeriesId,
      episodeId: e.sonarrEpisodeId,
      missing: this.languageNames(e.missing_subtitles),
    }));
    const films: WantedSubtitle[] = (movies?.data ?? []).map((m: any) => ({
      kind: "movie" as const,
      title: m.title ?? "Unknown",
      path: m.path,
      radarrId: m.radarrId,
      missing: this.languageNames(m.missing_subtitles),
    }));
    return [...episodes, ...films];
  }

  /** Ask providers what subtitles are available for one wanted episode — a manual search. */
  async searchEpisode(episodeId: number): Promise<ProviderSubtitle[]> {
    const raw = await this.get("/providers/episodes", { episodeid: String(episodeId) });
    return this.mapProviderResults(raw);
  }

  /** Ask providers what subtitles are available for one movie — a manual search. */
  async searchMovie(radarrId: number): Promise<ProviderSubtitle[]> {
    const raw = await this.get("/providers/movies", { radarrid: String(radarrId) });
    return this.mapProviderResults(raw);
  }

  private mapProviderResults(raw: any): ProviderSubtitle[] {
    const list = Array.isArray(raw) ? raw : (raw?.data ?? []);
    return list.map((r: any) => ({
      provider: r.provider,
      language: r.language?.name ?? r.language ?? "unknown",
      hearingImpaired: Boolean(r.hearing_impaired ?? r.hi),
      forced: Boolean(r.forced),
      score: r.score,
      release: r.release_info?.[0] ?? r.release_info,
      subtitle: r.subtitle,
    }));
  }

  /** Recent subtitle-download history, episodes and movies together, newest first. Each entry
   *  carries a stable id so the events poller can tell a fresh download from one already seen. */
  async getHistory(limit = 40): Promise<HistoryEntry[]> {
    const [eps, movies] = await Promise.all([
      this.get("/episodes/history", { start: "0", length: String(limit) }),
      this.get("/movies/history", { start: "0", length: String(limit) }),
    ]);
    const key = (kind: string, r: any): string =>
      `${kind}:${r.timestamp ?? r.parsed_timestamp ?? ""}:${r.subtitles_path ?? r.path ?? ""}:${r.language?.code3 ?? r.language ?? ""}`;
    const episodes: HistoryEntry[] = (eps?.data ?? []).map((r: any) => ({
      kind: "episode" as const,
      id: key("episode", r),
      title: `${r.seriesTitle ?? "Unknown"} — ${r.episodeTitle ?? ""}`.trim(),
      language: r.language?.name ?? r.language,
      provider: r.provider,
      path: r.subtitles_path,
      timestamp: r.timestamp,
      description: r.description,
    }));
    const films: HistoryEntry[] = (movies?.data ?? []).map((r: any) => ({
      kind: "movie" as const,
      id: key("movie", r),
      title: r.title ?? "Unknown",
      language: r.language?.name ?? r.language,
      provider: r.provider,
      path: r.subtitles_path,
      timestamp: r.timestamp,
      description: r.description,
    }));
    return [...episodes, ...films];
  }
}