import fs from 'node:fs';
import { afterAll, describe, expect, test } from 'vitest';
import { WebSocket } from 'ws';

import { createApp, type GibbzApp } from '../src/server/index.ts';
import { IceConfigProvider } from '../src/server/ice.ts';

let app: GibbzApp | undefined;
let port = 0;

async function startTestApp(): Promise<number> {
  if (!app) {
    app = createApp();
    await app.http.start(0, '127.0.0.1');
    port = app.http.address()!.port;
  }
  return port;
}

afterAll(async () => {
  await app?.stop();
});

describe('server', () => {
  test('static client files exist', () => {
    expect(fs.existsSync('src/client/index.html'), 'index.html exists').toBe(true);
    expect(fs.existsSync('src/client/main.ts'), 'main.ts exists').toBe(true);
    expect(fs.existsSync('src/client/style.css'), 'style.css exists').toBe(true);
  });

  test('/healthz answers ok', async () => {
    const p = await startTestApp();
    const res = await fetch(`http://127.0.0.1:${p}/healthz`);
    expect(res.status).toBe(200);
    expect(await res.text()).toBe('ok');
  });

  test('/api/ice returns cluster stun/turn', async () => {
    const p = await startTestApp();
    const res = await fetch(`http://127.0.0.1:${p}/api/ice`);
    expect(res.status).toBe(200);
    const ice = await res.json();
    expect(Array.isArray(ice.iceServers)).toBe(true);
    const stunUrls = ice.iceServers.flatMap((s: { urls: string | string[] }) =>
      Array.isArray(s.urls) ? s.urls : [s.urls],
    );
    expect(stunUrls.some((u: string) => u.includes('turn.k6n.net'))).toBe(true);
  });

  test('/api/rooms starts empty and reflects a connected peer', async () => {
    const p = await startTestApp();
    const empty = await (await fetch(`http://127.0.0.1:${p}/api/rooms`)).json();
    expect(empty).toEqual({});

    const ws = new WebSocket(`ws://127.0.0.1:${p}/ws?room=testroom&name=tester`);
    const hello = await new Promise<{ id: string; room: string; type: string }>((resolve, reject) => {
      ws.on('message', (raw) => {
        const msg = JSON.parse(raw.toString());
        if (msg.type === 'hello') resolve(msg);
      });
      ws.on('error', reject);
    });
    expect(hello.type).toBe('hello');
    expect(hello.room).toBe('testroom');
    expect(hello.id).toBeTruthy();

    const res = await fetch(`http://127.0.0.1:${p}/api/rooms`);
    const rooms = await res.json();
    expect(rooms.testroom).toBeTruthy();
    expect(rooms.testroom).toHaveLength(1);
    expect(rooms.testroom[0].name).toBe('tester');
    ws.close();
  });

  test('TURN secret generates ephemeral HMAC credentials', () => {
    const provider = new IceConfigProvider({ TURN_SECRET: 'secret123' });
    const config = provider.get();
    const turnServer = config.iceServers.find((s) =>
      (Array.isArray(s.urls) ? s.urls : [s.urls]).some((u) => u.startsWith('turn')),
    );
    expect(turnServer).toBeTruthy();
    expect(turnServer!.username!.endsWith(':gibbz')).toBe(true);
    expect(turnServer!.credential!.length).toBeGreaterThan(0);
  });

  test('ICE transport policy is passed through', () => {
    const provider = new IceConfigProvider({ ICE_TRANSPORT_POLICY: 'relay' });
    expect(provider.get().iceTransportPolicy).toBe('relay');
  });
});