import { WebSocket } from 'ws';
import crypto from 'crypto';

test('handshake completes with correct accept header', async () => {
  const ws = new WebSocket('ws://localhost:8080/');
  await new Promise((res, rej) => {
    ws.once('upgrade', (msg) => {
      expect(msg.statusCode).toBe(101);
      // server derives accept: base64(sha1(key + RFC 6455 GUID))
      const expectedKey = crypto
        .createHash('sha1')
        .update(ws._req?.getHeader('Sec-WebSocket-Key') + '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')
        .digest('base64');
      expect(msg.headers['sec-websocket-accept']).toBe(expectedKey);
      res(null);
    });
    ws.once('error', rej);
  });
  ws.close();
});

test('server picks v2 subprotocol when offered', async () => {
  const ws = new WebSocket('ws://localhost:8080/', ['chat-v1', 'chat-v2']);
  await new Promise((r) => ws.once('open', r));
  expect(ws.protocol).toBe('chat-v2');
  ws.close();
});

test('server rejects unknown subprotocol', async () => {
  const ws = new WebSocket('ws://localhost:8080/', ['unknown-v99']);
  await new Promise((res) => ws.once('close', (code) => { expect(code).toBe(1002); res(null); }));
});

test('client receives pong within 5s of ping', async () => {
  const ws = new WebSocket('ws://localhost:8080/');
  await new Promise((r) => ws.once('open', r));

  const pongReceived = new Promise((resolve) => {
    ws.on('pong', () => resolve(true));
  });
  ws.ping('keepalive');

  const got = await Promise.race([
    pongReceived,
    new Promise((r) => setTimeout(() => r(false), 5000)),
  ]);
  expect(got).toBe(true);
  ws.close();
});

test('client reconnects within 30s after server bounce', async () => {
  const ws = createReconnectingClient('ws://localhost:8080/');
  await waitForState(ws, 'open');

  await bounceServer();

  const reconnected = await waitForState(ws, 'open', { timeout: 30_000 });
  expect(reconnected).toBe(true);
});

test('app sends auth frame on open', async ({ page }) => {
  page.on('websocket', (ws) => {
    ws.on('framesent', (event) => {
      const data = JSON.parse(event.payload as string);
      if (data.type === 'auth') {
        expect(data.token).toBeTruthy();
      }
    });
  });
  await page.goto('https://localhost:3000/dashboard');
});