/**
 * API Endpoint Tests
 *
 * Comprehensive tests for critical DashCaddy API endpoints
 * Tests the migrated StateManager integration and core functionality
 */

const request = require('supertest');
const fs = require('fs');
const path = require('path');
const os = require('os');

// Create a test instance of the app
// Note: We need to mock the service file to avoid affecting production
const testServicesFile = path.join(os.tmpdir(), `test-services-${Date.now()}.json`);
const testConfigFile = path.join(os.tmpdir(), `test-config-${Date.now()}.json`);

// Set test environment
process.env.SERVICES_FILE = testServicesFile;
process.env.CONFIG_FILE = testConfigFile;
process.env.CADDYFILE_PATH = path.join(os.tmpdir(), 'test-Caddyfile');
process.env.CADDY_ADMIN_URL = 'http://localhost:2019';
process.env.ENABLE_HEALTH_CHECKER = 'false'; // Disable to avoid background processes
process.env.NODE_ENV = 'test';

// Initialize test files
fs.writeFileSync(testServicesFile, '[]', 'utf8');
fs.writeFileSync(testConfigFile, '{}', 'utf8');
fs.writeFileSync(process.env.CADDYFILE_PATH, '# Test Caddyfile', 'utf8');

// Now require the app (after env setup)
const app = require('../server');

describe('API Endpoints', () => {

  // Clean up before each test
  beforeEach(() => {
    fs.writeFileSync(testServicesFile, '[]', 'utf8');
  });

  // Clean up after all tests
  afterAll(() => {
    try {
      fs.unlinkSync(testServicesFile);
      fs.unlinkSync(testConfigFile);
      fs.unlinkSync(process.env.CADDYFILE_PATH);
    } catch (e) {
      // Ignore cleanup errors
    }
  });

  describe('GET /api/health', () => {
    test('should return healthy status', async () => {
      const res = await request(app).get('/api/health');

      expect(res.statusCode).toBe(200);
      expect(res.body).toHaveProperty('status', 'ok');
      expect(res.body).toHaveProperty('timestamp');
    });
  });

  describe('GET /api/services', () => {
    test('should return empty array initially', async () => {
      const res = await request(app).get('/api/services');

      expect(res.statusCode).toBe(200);
      expect(Array.isArray(res.body)).toBe(true);
      expect(res.body.length).toBe(0);
    });

    test('should return services after adding', async () => {
      // Add a service first
      await request(app)
        .post('/api/services')
        .send({
          id: 'test-service',
          name: 'Test Service',
          logo: '/assets/test.png',
          ip: 'localhost',
          tailscaleOnly: false
        });

      // Now get services
      const res = await request(app).get('/api/services');

      expect(res.statusCode).toBe(200);
      expect(res.body.length).toBe(1);
      expect(res.body[0]).toMatchObject({
        id: 'test-service',
        name: 'Test Service'
      });
    });

    test('should use StateManager (thread-safe)', async () => {
      // This test verifies StateManager is being used
      // by checking that the file is read correctly

      // Manually write to file
      const testData = [{ id: 'manual', name: 'Manual Service' }];
      fs.writeFileSync(testServicesFile, JSON.stringify(testData, null, 2));

      const res = await request(app).get('/api/services');

      expect(res.statusCode).toBe(200);
      expect(res.body).toEqual(testData);
    });
  });

  describe('POST /api/services', () => {
    test('should add a new service', async () => {
      const newService = {
        id: 'plex',
        name: 'Plex',
        logo: '/assets/plex.png',
        ip: 'localhost',
        tailscaleOnly: false
      };

      const res = await request(app)
        .post('/api/services')
        .send(newService);

      expect(res.statusCode).toBe(200);
      expect(res.body).toHaveProperty('success', true);

      // Verify service was added
      const services = JSON.parse(fs.readFileSync(testServicesFile, 'utf8'));
      expect(services.length).toBe(1);
      expect(services[0].id).toBe(newService.id);
      expect(services[0].name).toBe(newService.name);
      expect(services[0].logo).toBe(newService.logo);
    });

    test('should reject duplicate service IDs', async () => {
      const service = {
        id: 'duplicate',
        name: 'Duplicate Service'
      };

      // Add first time
      await request(app).post('/api/services').send(service);

      // Try to add again
      const res = await request(app).post('/api/services').send(service);

      expect(res.statusCode).toBe(409); // Conflict is the correct status code
      expect(res.body).toHaveProperty('success', false);
      expect(res.body.error).toContain('already exists');
    });

    test('should validate required fields', async () => {
      const res = await request(app)
        .post('/api/services')
        .send({
          // Missing 'id' and 'name'
          logo: '/assets/test.png'
        });

      expect(res.statusCode).toBe(400);
      expect(res.body).toHaveProperty('success', false);
    });

    test('should sanitize user input (XSS protection)', async () => {
      const maliciousService = {
        id: 'test<script>alert(1)</script>',
        name: '<img src=x onerror=alert(1)>',
        logo: '/assets/test.png'
      };

      const res = await request(app)
        .post('/api/services')
        .send(maliciousService);

      // Input should be sanitized or rejected
      const services = JSON.parse(fs.readFileSync(testServicesFile, 'utf8'));

      // If the service was added, script tags should be removed or escaped
      if (services.length > 0) {
        expect(services[0].id).not.toContain('<script>');
        expect(services[0].name).not.toContain('<img');
      } else {
        // If rejected entirely, that's also valid XSS protection
        expect(res.statusCode).toBeGreaterThanOrEqual(400);
      }
    });

    test('should handle concurrent POST requests (StateManager)', async () => {
      // Test that StateManager prevents race conditions
      const promises = [];

      for (let i = 0; i < 5; i++) {
        promises.push(
          request(app).post('/api/services').send({
            id: `service-${i}`,
            name: `Service ${i}`
          })
        );
      }

      const results = await Promise.all(promises);

      // All should succeed
      results.forEach(res => {
        expect(res.statusCode).toBe(200);
      });

      // Verify all 5 services were added (no data loss)
      const services = JSON.parse(fs.readFileSync(testServicesFile, 'utf8'));
      expect(services.length).toBe(5);
    });
  });

  describe('DELETE /api/services/:id', () => {
    beforeEach(async () => {
      // Add test services
      await request(app).post('/api/services').send({
        id: 'service1',
        name: 'Service 1'
      });
      await request(app).post('/api/services').send({
        id: 'service2',
        name: 'Service 2'
      });
    });

    test('should delete existing service', async () => {
      const res = await request(app).delete('/api/services/service1');

      expect(res.statusCode).toBe(200);
      expect(res.body).toHaveProperty('success', true);

      // Verify service was removed
      const services = JSON.parse(fs.readFileSync(testServicesFile, 'utf8'));
      expect(services.length).toBe(1);
      expect(services[0].id).toBe('service2');
    });

    test('should return 404 for non-existent service', async () => {
      const res = await request(app).delete('/api/services/nonexistent');

      expect(res.statusCode).toBe(404);
      expect(res.body).toHaveProperty('success', false);
    });

    test('should handle concurrent deletes gracefully', async () => {
      // Try to delete the same service twice simultaneously
      const promises = [
        request(app).delete('/api/services/service1'),
        request(app).delete('/api/services/service1')
      ];

      const results = await Promise.all(promises);

      // One should succeed, one should fail
      const statuses = results.map(r => r.statusCode).sort();
      expect(statuses).toContain(200); // One success
      expect(statuses).toContain(404); // One not found
    });
  });

  describe('PUT /api/services', () => {
    test('should bulk import services', async () => {
      const services = [
        { id: 'plex', name: 'Plex' },
        { id: 'jellyfin', name: 'Jellyfin' },
        { id: 'emby', name: 'Emby' }
      ];

      const res = await request(app)
        .put('/api/services')
        .send(services);

      expect(res.statusCode).toBe(200);
      expect(res.body).toHaveProperty('success', true);

      // Verify all services were imported
      const storedServices = JSON.parse(fs.readFileSync(testServicesFile, 'utf8'));
      expect(storedServices.length).toBe(3);
    });

    test('should replace existing services on import', async () => {
      // Add initial service
      await request(app).post('/api/services').send({
        id: 'old',
        name: 'Old Service'
      });

      // Import new services (should replace)
      const newServices = [
        { id: 'new1', name: 'New Service 1' },
        { id: 'new2', name: 'New Service 2' }
      ];

      await request(app).put('/api/services').send(newServices);

      // Verify old service was replaced
      const services = JSON.parse(fs.readFileSync(testServicesFile, 'utf8'));
      expect(services.length).toBe(2);
      expect(services.find(s => s.id === 'old')).toBeUndefined();
    });
  });

  describe('GET /api/apps/templates', () => {
    test('should return app templates', async () => {
      const res = await request(app).get('/api/apps/templates');

      expect(res.statusCode).toBe(200);
      expect(res.body).toHaveProperty('templates');
      expect(res.body).toHaveProperty('categories');

      // Should have 50+ templates
      expect(Object.keys(res.body.templates).length).toBeGreaterThan(50);
    });

    test.skip('should filter by category', async () => {
      // TODO: Category filtering not yet implemented in the API
      // This test will be enabled once the feature is added
      const res = await request(app)
        .get('/api/apps/templates')
        .query({ category: 'Media' });

      expect(res.statusCode).toBe(200);

      const templates = Object.values(res.body.templates);
      templates.forEach(template => {
        expect(template.category).toContain('Media');
      });
    });
  });

  describe('GET /api/apps/templates/:appId', () => {
    test('should return specific app template', async () => {
      const res = await request(app).get('/api/apps/templates/plex');

      expect(res.statusCode).toBe(200);
      expect(res.body).toHaveProperty('success', true);
      expect(res.body).toHaveProperty('template');
      expect(res.body.template).toHaveProperty('name', 'Plex');
      expect(res.body.template).toHaveProperty('docker');
      expect(res.body.template.docker).toHaveProperty('image');
    });

    test('should return 404 for unknown app', async () => {
      const res = await request(app).get('/api/apps/templates/nonexistent');

      expect(res.statusCode).toBe(404);
    });
  });

  describe('GET /api/config', () => {
    test('should return config', async () => {
      const res = await request(app).get('/api/config');

      expect(res.statusCode).toBe(200);
      expect(typeof res.body).toBe('object');
    });
  });

  describe('POST /api/config', () => {
    test('should save config', async () => {
      const config = {
        theme: 'dark',
        domain: 'test.local'
      };

      const res = await request(app)
        .post('/api/config')
        .send(config);

      expect(res.statusCode).toBe(200);
      expect(res.body).toHaveProperty('success', true);

      // Verify config was saved
      const savedConfig = JSON.parse(fs.readFileSync(testConfigFile, 'utf8'));
      expect(savedConfig).toMatchObject(config);
    });
  });

  describe('Rate Limiting', () => {
    test('should have rate limiting configured', async () => {
      // Rate limiting is skipped in test env, so verify the middleware is mounted
      // by checking that the response succeeds (rate limiter doesn't block)
      const res = await request(app).get('/api/services');
      expect(res.statusCode).toBe(200);
    });
  });

  describe('Error Handling', () => {
    test('should return 404 for unknown routes', async () => {
      const res = await request(app).get('/api/nonexistent');

      expect(res.statusCode).toBe(404);
    });

    test('should handle malformed JSON gracefully', async () => {
      const res = await request(app)
        .post('/api/services')
        .set('Content-Type', 'application/json')
        .send('{ invalid json }');

      expect(res.statusCode).toBe(400);
    });
  });

  describe('CORS Headers', () => {
    test('should include CORS headers for allowed origin', async () => {
      const res = await request(app)
        .get('/api/services')
        .set('Origin', 'http://localhost:3001');

      expect(res.headers).toHaveProperty('access-control-allow-origin');
    });

    test('should handle OPTIONS preflight requests', async () => {
      const res = await request(app)
        .options('/api/services')
        .set('Origin', 'http://localhost:3001');

      expect(res.statusCode).toBe(204);
      expect(res.headers).toHaveProperty('access-control-allow-methods');
    });
  });
});