import { describe, expect, it } from 'bun:test';
import { PeripheralTwinInstance } from '../peripheral-twin';

/**
 * Regression test for the peripheral WebRTC TURN gap.
 *
 * PeripheralTwinInstance.getWebRTCManager() once constructed the manager with no
 * options, so it never received an iceServersProvider — peripheral-attached media
 * (cameras/sensors) and data channels silently fell back to static STUN and could
 * not traverse a symmetric/CGNAT path. The fix mirrors PhyHubClient: inject a
 * provider that fetches short-lived TURN credentials via getIceServers('media').
 */
describe('PeripheralTwinInstance — TURN ICE provider injection', () => {
  it('injects an iceServersProvider that fetches media TURN credentials', async () => {
    const iceServersResult = { iceServers: [{ urls: ['turn:relay:3478'] }], ttlSeconds: 3600 };
    const getIceServersCalls: Array<string | undefined> = [];
    const fakePhyHubClient = {
      getIceServers: async (useCase?: 'media' | 'data') => {
        getIceServersCalls.push(useCase);
        return iceServersResult;
      },
    };

    const instance = new PeripheralTwinInstance(fakePhyHubClient as never, 'twin-1');
    // Stub the seams initialize() would otherwise populate.
    (instance as unknown as { messaging: unknown }).messaging = { emit() {}, on() {}, to: () => ({ emit() {} }) };
    (instance as unknown as { webrtcTransport: unknown }).webrtcTransport = {
      twinId: 'twin-1',
      sendMessage: async () => {},
      subscribe: async () => {},
      onMessage: () => {},
      offMessage: () => {},
    };

    const manager = (instance as unknown as { getWebRTCManager: () => unknown }).getWebRTCManager();
    const provider = (manager as { iceServersProvider?: () => Promise<unknown> }).iceServersProvider;

    expect(typeof provider).toBe('function');
    const resolved = await provider!();
    expect(resolved).toEqual(iceServersResult);
    // Must request the 'media' use case (1h-floor TTL safe for media + data).
    expect(getIceServersCalls).toEqual(['media']);
  });
});