import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import Fastify from 'fastify';
import type { FastifyInstance } from 'fastify';
import { getAllFlags } from './lib/feature-flags.js';
import { getBufferedEvents, flushEvents } from './lib/telemetry.js';
import { config } from './lib/config.js';
import { PRODUCT_ID, productConfig } from './lib/product-config.js';

let app: FastifyInstance;

beforeAll(async () => {
  app = Fastify({ logger: false });
  app.get('/api/diagnostics/flags', async () => getAllFlags());
  app.get('/api/diagnostics/telemetry', async () => ({ events: getBufferedEvents() }));
  app.post('/api/diagnostics/telemetry/flush', async () => ({ flushed: flushEvents().length }));
  app.get('/api/diagnostics/config', async () => ({
    productId: PRODUCT_ID,
    serviceName: config.SERVICE_NAME,
    port: config.PORT,
    nodeEnv: config.NODE_ENV,
    dbProvider: config.DB_PROVIDER,
    telemetryEnabled: config.TELEMETRY_ENABLED,
    featureFlagsEnabled: config.FEATURE_FLAGS_ENABLED,
  }));
  app.get('/health', async (req) => ({
    status: 'ok',
    service: config.SERVICE_NAME,
    version: '0.1.0',
    timestamp: new Date().toISOString(),
    requestId: req.id,
  }));
  app.get('/api/bootstrap', async () => ({
    productId: productConfig.productId,
    displayName: productConfig.displayName,
    backendPort: config.PORT,
  }));
  await app.ready();
});

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

describe('diagnostics routes', () => {
  it('GET /api/diagnostics/flags returns feature flags', async () => {
    const res = await app.inject({ method: 'GET', url: '/api/diagnostics/flags' });
    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(typeof body).toBe('object');
    expect(body).not.toBeNull();
  });

  it('GET /api/diagnostics/telemetry returns buffered events', async () => {
    const res = await app.inject({ method: 'GET', url: '/api/diagnostics/telemetry' });
    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(body).toHaveProperty('events');
    expect(Array.isArray(body.events)).toBe(true);
  });

  it('POST /api/diagnostics/telemetry/flush returns flushed count', async () => {
    const res = await app.inject({ method: 'POST', url: '/api/diagnostics/telemetry/flush' });
    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(body).toHaveProperty('flushed');
    expect(typeof body.flushed).toBe('number');
  });

  it('GET /api/diagnostics/config returns sanitized config', async () => {
    const res = await app.inject({ method: 'GET', url: '/api/diagnostics/config' });
    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(body).toHaveProperty('productId');
    expect(body).toHaveProperty('serviceName');
    expect(body).toHaveProperty('port');
    expect(body).toHaveProperty('nodeEnv');
    expect(body).toHaveProperty('dbProvider');
    expect(typeof body.telemetryEnabled).toBe('boolean');
    expect(typeof body.featureFlagsEnabled).toBe('boolean');
  });

  it('GET /health returns standard health response', async () => {
    const res = await app.inject({ method: 'GET', url: '/health' });
    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(body.status).toBe('ok');
    expect(body).toHaveProperty('service');
    expect(body).toHaveProperty('version');
    expect(body).toHaveProperty('timestamp');
    expect(body.timestamp).toMatch(/^\d{4}-\d{2}-\d{2}T/);
  });

  it('GET /api/bootstrap returns product identity', async () => {
    const res = await app.inject({ method: 'GET', url: '/api/bootstrap' });
    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(body).toHaveProperty('productId');
    expect(body).toHaveProperty('displayName');
    expect(body).toHaveProperty('backendPort');
    expect(typeof body.productId).toBe('string');
    expect(typeof body.displayName).toBe('string');
    expect(typeof body.backendPort).toBe('number');
  });
});