/**
 * TASK-0091 — realtime config: the gateway port must come from `REALTIME_PORT`
 * (the documented env), NOT the shared `PORT`, which the dev stack sets to the
 * API's 4000. Regression: the gateway used to read `PORT` and die with
 * EADDRINUSE when launched from the same sourced env as the API.
 */
import { describe, expect, it } from "vitest";

import { loadConfig } from "../src/config.js";

const BASE = { JWT_SECRET: "test-secret", INTERNAL_SERVICE_TOKEN: "tok" };

describe("realtime loadConfig — port resolution", () => {
  it("defaults to 4001 when neither REALTIME_PORT nor PORT is set", () => {
    const cfg = loadConfig({ ...BASE });
    expect(cfg.port).toBe(4001);
    expect(cfg.healthPort).toBe(4002);
  });

  it("reads REALTIME_PORT and does NOT take the API's PORT (dev-stack collision)", () => {
    const cfg = loadConfig({ ...BASE, PORT: "4000", REALTIME_PORT: "4001" });
    expect(cfg.port).toBe(4001);
    expect(cfg.healthPort).toBe(4002);
  });

  it("honors an explicit REALTIME_PORT override", () => {
    const cfg = loadConfig({ ...BASE, PORT: "4000", REALTIME_PORT: "5050" });
    expect(cfg.port).toBe(5050);
  });

  it("falls back to PORT only when REALTIME_PORT is unset (standalone run)", () => {
    const cfg = loadConfig({ ...BASE, PORT: "6000" });
    expect(cfg.port).toBe(6000);
  });

  it("throws without JWT_SECRET", () => {
    expect(() => loadConfig({ ...BASE, JWT_SECRET: "" })).toThrow(/JWT_SECRET/);
    expect(() => loadConfig({ ...BASE, JWT_SECRET: "  " })).toThrow(/JWT_SECRET/);
    expect(() => loadConfig({} as NodeJS.ProcessEnv)).toThrow(/JWT_SECRET/);
  });
});