process.env.DATABASE_PATH = ':memory:';
process.env.THEMES_DIR = './themes';
process.env.FRONTEND_DIST = './frontend/dist';
process.env.NODE_ENV = 'test';

import { Test } from '@nestjs/testing';
import { INestApplication, ValidationPipe } from '@nestjs/common';
import { HttpAdapterHost } from '@nestjs/core';
import cookieParser from 'cookie-parser';
import * as express from 'express';
import request from 'supertest';
import { AppModule } from '../../backend/src/app.module';
import { GlobalExceptionFilter } from '../../backend/src/common/filters/global-exception.filter';
import { CsrfMiddleware } from '../../backend/src/common/middleware/csrf.middleware';
import { SseHubService } from '../../backend/src/common/services/sse-hub.service';
import { ConfigService } from '@nestjs/config';
import { initDb } from './db-helper';

describe('GET /api/v1/event/stream forwards general topic (Job 892)', () => {
  let app: INestApplication;
  let hub: SseHubService;

  beforeAll(async () => {
    const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile();
    app = moduleRef.createNestApplication();
    app.use(cookieParser());
    app.use(express.json({ limit: '1mb' }));
    const csrfMw = new CsrfMiddleware(app.get(ConfigService));
    app.use((req: any, res: any, next: any) => csrfMw.use(req, res, next));
    app.useGlobalPipes(new ValidationPipe({ whitelist: true, forbidNonWhitelisted: false, transform: true }));
    const httpAdapterHost = app.get(HttpAdapterHost);
    app.useGlobalFilters(new GlobalExceptionFilter(httpAdapterHost));
    await app.init();
    await initDb(app);
    await request(app.getHttpServer())
      .post('/api/v1/auth/register-first-admin')
      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
      .expect(201);
    hub = app.get(SseHubService);
  });

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

  it('emits a { topic: "general", themeKey, registrationsEnabled } frame through the public stream', (done) => {
    const server = app.getHttpServer();
    const req = request(server).get('/api/v1/event/stream');
    let received = false;
    req
      .buffer(true)
      .parse((res, cb) => {
        const chunks: Buffer[] = [];
        const finalize = () => cb(null, Buffer.concat(chunks));
        res.on('data', (chunk: Buffer) => {
          chunks.push(chunk);
          if (received) return;
          const text = Buffer.concat(chunks).toString('utf8');
          const match = /data: (\{[^{]*?"topic":\s*"general"[^{]*\})\n/.exec(text);
          if (!match) return;
          try {
            const payload = JSON.parse(match[1]);
            expect(payload.topic).toBe('general');
            expect(payload).toHaveProperty('themeKey');
            expect(payload).toHaveProperty('registrationsEnabled');
            received = true;
            (res as any).destroy();
            done();
          } catch (e) {
            (res as any).destroy();
            done(e);
          }
        });
        res.on('end', finalize);
        res.on('error', (err) => cb(err, null));
      })
      .end(() => {});

    // Push the hub event shortly after the consumer attaches.
    setTimeout(() => {
      hub.emitEvent({ topic: 'general', themeKey: 'midnight', registrationsEnabled: true });
    }, 150);

    setTimeout(() => {
      if (!received) {
        done(new Error('Did not receive a general frame within 5s'));
      }
    }, 5000);
  }, 10_000);
});