export const config = {
  env: process.env.NODE_ENV ?? "development",
  port: Number(process.env.API_PORT ?? 8221),
  host: process.env.API_HOST ?? "127.0.0.1",
  webUrl: (process.env.WEB_URL ?? process.env.NEXT_PUBLIC_SITE_URL ?? "http://localhost:8220").replace(/\/$/, ""),
  redisUrl: process.env.REDIS_URL ?? "",
  internalToken: process.env.INTERNAL_SERVICE_TOKEN ?? "",
  logLevel: process.env.LOG_LEVEL ?? "info",
  /** Store response bodies for playground inspection (never for API by default). */
  storeBodies: process.env.FETCHA_STORE_BODIES === "1",
  healthProbeIntervalMs: Number(process.env.HEALTH_PROBE_INTERVAL_MS ?? 5 * 60_000),
  maxResponseBytesDefault: Number(process.env.MAX_RESPONSE_BYTES ?? 20_000_000),
  /** Multiplier over upstream cost used for customer pricing when a plan has no explicit unit price. */
  defaultMargin: Number(process.env.FETCHA_DEFAULT_MARGIN ?? 2.5),
  version: process.env.FETCHA_VERSION ?? "0.1.0",
} as const;

export function assertProductionConfig(): void {
  if (config.env !== "production") return;
  const missing: string[] = [];
  if (!process.env.DATABASE_URL) missing.push("DATABASE_URL");
  if (!config.internalToken || config.internalToken === "change-me") missing.push("INTERNAL_SERVICE_TOKEN");
  if (missing.length) throw new Error(`Missing required production configuration: ${missing.join(", ")}`);
}