import { describe, it, expect } from 'vitest';
import { discoverServer, getLanIPv4, resolveAdvertiseUrl, startDiscoveryBroadcaster } from '../src/discovery.js';

describe('discovery', () => {
  it('returns a LAN IPv4 address', () => {
    const ip = getLanIPv4();
    expect(ip).toBeDefined();
    expect(ip).not.toBe('127.0.0.1');
  });

  it('resolves advertise URL for 0.0.0.0 to LAN IP', () => {
    const url = resolveAdvertiseUrl('0.0.0.0', 3377);
    expect(url).toMatch(/^http:\/\/\d+\.\d+\.\d+\.\d+:3377$/);
  });

  it('resolves advertise URL for a specific host', () => {
    const url = resolveAdvertiseUrl('127.0.0.1', 3377);
    expect(url).toBe('http://127.0.0.1:3377');
  });

  it('discovers a broadcaster on localhost', async () => {
    const port = 53378;
    const url = 'http://127.0.0.1:3377';
    const broadcaster = startDiscoveryBroadcaster(url, { port, intervalMs: 500 });
    try {
      const discovered = await discoverServer(3000, port);
      expect(discovered).toBe(url);
    } finally {
      broadcaster.stop();
    }
  });
});