import { describe, test, expect, beforeEach, afterEach } from 'bun:test';
import { WebhookServer } from '../../src/server';

describe('WebhookServer', () => {
  const envBackup = process.env;

  beforeEach(() => {
    process.env = { 
      ...envBackup, 
      INSTANCE_NAME: 'test-instance',
      NODE_ENV: 'test'
    };
  });

  afterEach(() => {
    process.env = envBackup;
  });

  const createTestRequest = (payload: any) => 
    new Request('http://localhost:3007', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });

  test('should reject non-POST requests', async () => {
    const request = new Request('http://localhost:3007', { method: 'GET' });
    const response = await WebhookServer.handleRequest(request);
    expect(response.status).toBe(405);
  });

  test('should require JSON content type', async () => {
    const request = new Request('http://localhost:3007', {
      method: 'POST',
      headers: { 'Content-Type': 'text/plain' }
    });
    const response = await WebhookServer.handleRequest(request);
    expect(response.status).toBe(400);
  });

  test('should validate payload structure', async () => {
    const invalidPayloads = [
      {},
      { event: null },
      { event: 'messages.upsert', instance: null }
    ];

    for (const payload of invalidPayloads) {
      const request = createTestRequest(payload);
      const response = await WebhookServer.handleRequest(request);
      expect(response.status).toBe(400);
    }
  });

  test('should verify instance name', async () => {
    const payload = {
      event: 'messages.upsert',
      instance: 'wrong-instance',
      data: {}
    };
    const request = createTestRequest(payload);
    const response = await WebhookServer.handleRequest(request);
    expect(response.status).toBe(403);
  });

  test('should handle valid messages.upsert', async () => {
    const payload = {
      event: 'messages.upsert',
      instance: 'test-instance',
      data: {
        key: {
          remoteJid: 'group-id@g.us',
          participant: 'sender-id@s.whatsapp.net'
        },
        message: { conversation: '/tarea nueva Test' }
      }
    };
    const request = createTestRequest(payload);
    const response = await WebhookServer.handleRequest(request);
    expect(response.status).toBe(200);
  });
});