farmcontrol-api/src/events/__tests__/eventmanager.test.js

import { jest } from '@jest/globals';

jest.unstable_mockModule('../../database/nats.js', () => ({
  natsServer: {
    publish: jest.fn().mockResolvedValue({ success: true }),
    subscribe: jest.fn().mockResolvedValue({ success: true }),
    removeSubscription: jest.fn().mockResolvedValue({ success: true })
  }
}));

jest.unstable_mockModule('log4js', () => ({
  default: {
    getLogger: () => ({
      level: 'info',
      debug: jest.fn(),
      error: jest.fn(),
      warn: jest.fn(),
      trace: jest.fn(),
      info: jest.fn()
    })
  }
}));

jest.unstable_mockModule('../../config.js', () => ({
  default: {
    server: {
      logLevel: 'info'
    }
  }
}));

const { EventManager } = await import('../eventmanager.js');
const { natsServer } = await import('../../database/nats.js');

describe('EventManager', () => {
  let mockSocketClient;
  let eventManager;

  beforeEach(() => {
    jest.clearAllMocks();

    mockSocketClient = {
      socketId: 'test-socket-id',
      socket: {
        emit: jest.fn()
      }
    };

    eventManager = new EventManager(mockSocketClient);
  });

  describe('subscribeToObjectEvent', () => {
    it('should subscribe to object events and emit when received', async () => {
      const id = 'obj-123';
      const objectType = 'printer';
      const eventType = 'status';

      await eventManager.subscribeToObjectEvent(id, objectType, eventType);

      expect(natsServer.subscribe).toHaveBeenCalledWith(
        'printers.obj-123.events.status',
        'test-socket-id',
        expect.any(Function)
      );

      // Simulate NATS message
      const natsCallback = natsServer.subscribe.mock.calls[0][2];
      const eventData = { status: 'online' };

      natsCallback('printers.obj-123.events.status', eventData);

      expect(mockSocketClient.socket.emit).toHaveBeenCalledWith('objectEvent', {
        _id: id,
        objectType: objectType,
        event: eventData
      });
    });
  });

  describe('removeObjectEventsListener', () => {
    it('should remove specific subscription', async () => {
      const id = 'obj-123';
      const objectType = 'printer';
      const eventType = 'status';

      await eventManager.subscribeToObjectEvent(id, objectType, eventType);
      await eventManager.removeObjectEventsListener(id, objectType, eventType);

      expect(natsServer.removeSubscription).toHaveBeenCalledWith(
        'printers.obj-123.events.status',
        'test-socket-id'
      );
      expect(eventManager.subscriptions.size).toBe(0);
    });
  });

  describe('sendObjectEvent', () => {
    it('should publish event to NATS', async () => {
      const id = 'obj-123';
      const objectType = 'printer';
      const event = { type: 'alert', message: 'low filament' };

      const result = await eventManager.sendObjectEvent(id, objectType, event);

      expect(result).toEqual({ success: true });
      expect(natsServer.publish).toHaveBeenCalledWith(
        'printers.obj-123.events.alert',
        event
      );
    });

    it('should handle errors when publishing fails', async () => {
      natsServer.publish.mockRejectedValueOnce(new Error('NATS error'));

      const result = await eventManager.sendObjectEvent('id', 'type', {
        type: 't'
      });

      expect(result).toHaveProperty('error', 'NATS error');
    });
  });

  describe('removeAllListeners', () => {
    it('should remove all subscriptions', async () => {
      await eventManager.subscribeToObjectEvent('1', 'printer', 'e1');
      await eventManager.subscribeToObjectEvent('2', 'printer', 'e2');

      await eventManager.removeAllListeners();

      expect(natsServer.removeSubscription).toHaveBeenCalledTimes(2);
      expect(eventManager.subscriptions.size).toBe(0);
    });
  });
});