// The Ombi API client — ombi's own code, living in the module (novox/hq ADR 0039). Ombi is the
// request front-end: viewers ask for movies and shows, and an operator approves them. This client
// talks its /api/v1 REST API (keyed by an ApiKey header); ombi's tools and events import it.

import { readFileSync } from "node:fs";

export interface OmbiRequest {
  kind: "movie" | "tv";
  id: number;
  title: string;
  requestedBy?: string;
  requestedDate?: string;
  approved: boolean;
  available: boolean;
  denied: boolean;
  tmdbId?: number;
}

export interface RequestCounts {
  pending: number;
  approved: number;
  available: number;
}

/** The settings-merged config the mesh delivers (novox/hq ADR 0046): { url, apiKey, token, password, user, ... }. */
function meshConfig(file?: string): Record<string, string> {
  if (!file) return {};
  try { return JSON.parse(readFileSync(file, "utf8")) as Record<string, string>; }
  catch { return {}; }
}

/** Read a secret the mesh mounted at a file path (an own-secret delivered by `secret accept`);
 *  absent or unreadable yields undefined so callers fall back rather than crash. */
function readSecret(file?: string): string | undefined {
  if (!file) return undefined;
  try { return readFileSync(file, "utf8").trim(); }
  catch { return undefined; }
}

export class OmbiClient {
  readonly baseUrl: string;

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

  /** Build from the module's resolved environment. Ombi'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): OmbiClient {
    const cfg = meshConfig(env.MESH_OMBI_CONFIG_FILE);
    const url = cfg.url ?? env.MESH_OMBI_URL;
    const apiKey = cfg.apiKey ?? readSecret(env.MESH_OMBI_API_KEY_FILE) ?? env.MESH_OMBI_API_KEY;
    if (!url) throw new Error("no Ombi URL — set MESH_OMBI_URL");
    if (!apiKey) throw new Error("no Ombi API key — set MESH_OMBI_API_KEY");
    return new OmbiClient(url, apiKey);
  }

  private async request(method: string, path: string, body?: unknown): Promise<any> {
    const res = await fetch(`${this.baseUrl}/api/v1${path}`, {
      method,
      headers: {
        ApiKey: this.apiKey,
        Accept: "application/json",
        ...(body !== undefined ? { "Content-Type": "application/json" } : {}),
      },
      body: body !== undefined ? JSON.stringify(body) : undefined,
    });
    if (!res.ok) throw new Error(`Ombi API ${method} ${path}: ${res.status} ${await res.text()}`);
    const text = await res.text();
    return text ? JSON.parse(text) : {};
  }

  /** All requests, movies and TV together — who asked for what, and where each stands. */
  async getRequests(): Promise<OmbiRequest[]> {
    const [movies, tv] = await Promise.all([
      this.request("GET", "/Request/movie"),
      this.request("GET", "/Request/tv"),
    ]);
    const films: OmbiRequest[] = (Array.isArray(movies) ? movies : []).map((r: any) => ({
      kind: "movie" as const,
      id: r.id,
      title: r.title ?? "Unknown",
      requestedBy: r.requestedUser?.userName ?? r.requestedUser?.userAlias,
      requestedDate: r.requestedDate,
      approved: Boolean(r.approved),
      available: Boolean(r.available),
      denied: Boolean(r.denied),
      tmdbId: r.theMovieDbId,
    }));
    // TV requests carry per-season child requests; the top-level record is approved when all its
    // children are, which is the grain an operator acts on.
    const shows: OmbiRequest[] = (Array.isArray(tv) ? tv : []).map((r: any) => {
      const children: any[] = r.childRequests ?? [];
      return {
        kind: "tv" as const,
        id: r.id,
        title: r.title ?? "Unknown",
        requestedBy: children[0]?.requestedUser?.userName,
        requestedDate: children[0]?.requestedDate,
        approved: children.length > 0 && children.every((c) => c.approved),
        available: children.length > 0 && children.every((c) => c.available),
        denied: children.some((c) => c.denied),
        tmdbId: r.theMovieDbId,
      };
    });
    return [...films, ...shows];
  }

  /** Live pending/approved/available counts — a one-line health read without listing everything. */
  async getCounts(): Promise<RequestCounts> {
    const c = await this.request("GET", "/Request/count");
    return { pending: c.pending ?? 0, approved: c.approved ?? 0, available: c.available ?? 0 };
  }

  /** Approve a request. TV approval fans out to the request's child (per-season) requests. */
  async approve(kind: "movie" | "tv", id: number): Promise<void> {
    await this.request("POST", `/Request/${kind}/approve`, { id });
  }
}