// src/routes/system.routes.test.ts
import { describe, it, expect, vi, beforeEach } from 'vitest';
import supertest from 'supertest';
import { createTestApp } from '../tests/utils/createTestApp';

// 1. Mock the Service Layer
// This decouples the route test from the service's implementation details.
vi.mock('../services/systemService', () => ({
  systemService: {
    getPm2Status: vi.fn(),
  },
}));
// 2. Mock Geocoding
vi.mock('../services/geocodingService.server', () => ({
  geocodingService: {
    geocodeAddress: vi.fn(),
  },
}));

// 3. Mock Logger
vi.mock('../services/logger.server', () => ({
  logger: {
    info: vi.fn(),
    debug: vi.fn(),
    error: vi.fn(),
    warn: vi.fn(),
    child: vi.fn().mockReturnThis(),
  },
}));

// Import the router AFTER all mocks are defined to ensure systemService picks up the mocked util.promisify
import { systemService } from '../services/systemService';
import systemRouter from './system.routes';
import { geocodingService } from '../services/geocodingService.server';

describe('System Routes (/api/system)', () => {
  const app = createTestApp({ router: systemRouter, basePath: '/api/system' });

  beforeEach(() => {
    vi.clearAllMocks();
  });

  describe('GET /pm2-status', () => {
    it('should return success: true when pm2 process is online', async () => {
      // Arrange: Simulate a successful `pm2 describe` output for an online process.
      vi.mocked(systemService.getPm2Status).mockResolvedValue({
        success: true,
        message: 'Application is online and running under PM2.',
      });

      // Act
      const response = await supertest(app).get('/api/system/pm2-status');

      // Assert
      expect(response.status).toBe(200);
      expect(response.body).toEqual({
        success: true,
        message: 'Application is online and running under PM2.',
      });
    });

    it('should return success: false when pm2 process is stopped or errored', async () => {
      vi.mocked(systemService.getPm2Status).mockResolvedValue({
        success: false,
        message: 'Application process exists but is not online.',
      });

      const response = await supertest(app).get('/api/system/pm2-status');

      // Assert
      expect(response.status).toBe(200);
      expect(response.body.success).toBe(false);
    });

    it('should return success: false when pm2 process does not exist', async () => {
      // Arrange: Simulate `pm2 describe` failing because the process isn't found.
      vi.mocked(systemService.getPm2Status).mockResolvedValue({
        success: false,
        message: 'Application process is not running under PM2.',
      });

      // Act
      const response = await supertest(app).get('/api/system/pm2-status');

      // Assert
      expect(response.status).toBe(200);
      expect(response.body).toEqual({
        success: false,
        message: 'Application process is not running under PM2.',
      });
    });

    it('should return 500 if pm2 command produces stderr output', async () => {
      // Arrange: Simulate a successful exit code but with content in stderr.
      const serviceError = new Error('PM2 command produced an error: A non-fatal warning occurred.');
      vi.mocked(systemService.getPm2Status).mockRejectedValue(serviceError);

      const response = await supertest(app).get('/api/system/pm2-status');
      expect(response.status).toBe(500);
      expect(response.body.message).toBe(serviceError.message);
    });

    it('should return 500 on a generic exec error', async () => {
      const serviceError = new Error('System error');
      vi.mocked(systemService.getPm2Status).mockRejectedValue(serviceError);

      // Act
      const response = await supertest(app).get('/api/system/pm2-status');

      // Assert
      expect(response.status).toBe(500);
      expect(response.body.message).toBe('System error');
    });
  });

  describe('POST /geocode', () => {
    it('should return geocoded coordinates for a valid address', async () => {
      // Arrange
      const mockCoordinates = { lat: 48.4284, lng: -123.3656 };
      vi.mocked(geocodingService.geocodeAddress).mockResolvedValue(mockCoordinates);

      // Act
      const response = await supertest(app)
        .post('/api/system/geocode')
        .send({ address: 'Victoria, BC' });

      // Assert
      expect(response.status).toBe(200);
      expect(response.body).toEqual(mockCoordinates);
    });

    it('should return 404 if the address cannot be geocoded', async () => {
      vi.mocked(geocodingService.geocodeAddress).mockResolvedValue(null);
      const response = await supertest(app)
        .post('/api/system/geocode')
        .send({ address: 'Invalid Address' });
      expect(response.status).toBe(404);
      expect(response.body.message).toBe('Could not geocode the provided address.');
    });

    it('should return 500 if the geocoding service throws an error', async () => {
      const geocodeError = new Error('Geocoding service unavailable');
      vi.mocked(geocodingService.geocodeAddress).mockRejectedValue(geocodeError);
      const response = await supertest(app)
        .post('/api/system/geocode')
        .send({ address: 'Any Address' });
      expect(response.status).toBe(500);
    });

    it('should return 400 if the address is missing from the body', async () => {
      const response = await supertest(app)
        .post('/api/system/geocode')
        .send({ not_address: 'Victoria, BC' });
      expect(response.status).toBe(400);
      // Zod validation error message can vary slightly depending on configuration or version
      expect(response.body.errors[0].message).toMatch(/An address string is required|Required/i);
    });
  });
});