import { z } from "zod";

const configSchema = z.object({
  NODE_ENV: z.enum(["development", "production", "test"]).default("development"),
  PORT: z.coerce.number().default(3000),
  HOST: z.string().default("0.0.0.0"),
  DATABASE_URL: z.string(),
  REDIS_URL: z.string().default("redis://localhost:6379"),
  SESSION_SECRET: z.string().min(32),
  ADMIN_EMAIL: z.string().email().optional(),
  ADMIN_PASSWORD: z.string().min(8).optional(),
  TMDB_API_KEY: z.string().optional(),
  /** OMDb (IMDb metadata) — used as admin search/link fallback when TMDB has no match */
  OMDB_API_KEY: z.string().optional(),
  PUBLIC_URL: z.string().url().default("http://localhost:3000"),
  /** Base URL shown on TV for /link (often admin UI). Falls back to PUBLIC_URL. */
  CLIENT_LINK_BASE_URL: z.preprocess(
    (v) => (typeof v === "string" && v.trim() === "" ? undefined : v),
    z.string().url().optional()
  ),
  PLAYBACK_IDLE_TIMEOUT_SECONDS: z.coerce.number().default(1200),
  PLAYBACK_ABSOLUTE_LIFETIME_SECONDS: z.coerce.number().default(43200),
  NODE_HEARTBEAT_INTERVAL_SECONDS: z.coerce.number().default(30),
  NODE_OFFLINE_THRESHOLD_SECONDS: z.coerce.number().default(90),
  HIDE_UNAVAILABLE_TITLES: z.coerce.boolean().default(true),
  /** Google Cloud Identity Groups — Closed Testing access control */
  GOOGLE_CLOUD_PROJECT_ID: z.string().optional(),
  GOOGLE_SERVICE_ACCOUNT_EMAIL: z.string().email().optional(),
  GOOGLE_SERVICE_ACCOUNT_PRIVATE_KEY: z.string().optional(),
  GOOGLE_WORKSPACE_CUSTOMER_ID: z.string().optional(),
  GOOGLE_WORKSPACE_ADMIN_EMAIL: z.string().email().optional(),
  PLAY_ACCESS_GROUP_ID: z.string().optional(),
  PLAY_ACCESS_GROUP_EMAIL: z.string().email().optional(),
  /** Public Closed Testing opt-in URL (shown in admin UI) */
  GOOGLE_PLAY_OPT_IN_URL: z.string().url().optional(),
  /** Periodic reconciliation interval (ms); 0 = disabled. Default: 24h */
  GOOGLE_PLAY_SYNC_INTERVAL_MS: z.coerce.number().default(86_400_000),
  /**
   * Optionele rijke XMLTV-feed (icons/desc/episode), bv. Odido.
   * Wordt gemerged met XUI xmltv.php op epg_channel_id — voorkomt dat XUI icons weglaat.
   */
  IPTV_EPG_XML_URL: z.preprocess(
    (v) => (typeof v === "string" && v.trim() === "" ? undefined : v),
    z.string().url().optional()
  ),
  /**
   * Shared secret for the Windows token-tray agent.
   * Header: X-Tray-Key. Empty/unset = agent endpoints disabled.
   */
  TOKEN_TRAY_SECRET: z.preprocess(
    (v) => (typeof v === "string" && v.trim() === "" ? undefined : v),
    z.string().min(16).optional()
  ),
});

export type Config = z.infer<typeof configSchema>;

export function loadConfig(): Config {
  const result = configSchema.safeParse(process.env);
  if (!result.success) {
    console.error("Invalid configuration:", result.error.flatten().fieldErrors);
    process.exit(1);
  }
  return result.data;
}