/**
 * Integration tests for Queue SSE Stream endpoint
 * 
 * Tests the Server-Sent Events stream for real-time queue updates.
 */

import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { queueManager } from '$lib/server/queue/QueueManager';
import { GET as streamGET } from '../routes/api/queue/stream/+server.js';

describe('Queue SSE Stream Endpoint', () => {
  beforeEach(() => {
    // Clear queue between tests
    queueManager.getAll().forEach(item => queueManager.remove(item.id));
  });
  
  afterEach(() => {
    // Clean up after tests
    queueManager.getAll().forEach(item => queueManager.remove(item.id));
  });
  
  describe('GET /api/queue/stream', () => {
    it('should return SSE response with correct headers', async () => {
      const url = new URL('http://localhost/api/queue/stream');
      const request = new Request(url);
      
      const response = await streamGET({ 
        url, 
        request: {
          ...request,
          signal: new AbortController().signal
        }
      } as any);
      
      expect(response.status).toBe(200);
      expect(response.headers.get('Content-Type')).toBe('text/event-stream');
      expect(response.headers.get('Cache-Control')).toBe('no-cache');
      // Connection header no longer manually set - managed automatically by Node.js
    });
    
    it('should reject invalid status filter', async () => {
      const url = new URL('http://localhost/api/queue/stream?status=invalid');
      const request = new Request(url);
      
      const response = await streamGET({ 
        url, 
        request: {
          ...request,
          signal: new AbortController().signal
        }
      } as any);
      
      expect(response.status).toBe(400);
      const text = await response.text();
      expect(text).toContain('Invalid status filter');
    });
    
    it('should reject invalid item ID format', async () => {
      const url = new URL('http://localhost/api/queue/stream?id=invalid-id');
      const request = new Request(url);
      
      const response = await streamGET({ 
        url, 
        request: {
          ...request,
          signal: new AbortController().signal
        }
      } as any);
      
      expect(response.status).toBe(400);
      const text = await response.text();
      expect(text).toBe('Invalid queue item ID format');
    });
    
    it('should accept valid status filter', async () => {
      const url = new URL('http://localhost/api/queue/stream?status=pending');
      const request = new Request(url);
      
      const response = await streamGET({ 
        url, 
        request: {
          ...request,
          signal: new AbortController().signal
        }
      } as any);
      
      expect(response.status).toBe(200);
      expect(response.headers.get('Content-Type')).toBe('text/event-stream');
    });
    
    it('should accept valid item ID filter', async () => {
      // Add a test item first
      const item = queueManager.enqueue('https://instagram.com/p/TEST123');
      
      const url = new URL(`http://localhost/api/queue/stream?id=${item.id}`);
      const request = new Request(url);
      
      const response = await streamGET({ 
        url, 
        request: {
          ...request,
          signal: new AbortController().signal
        }
      } as any);
      
      expect(response.status).toBe(200);
      expect(response.headers.get('Content-Type')).toBe('text/event-stream');
    });
    
    it('should handle stream initialization without errors', async () => {
      // Add some test items
      queueManager.enqueue('https://instagram.com/p/TEST1');
      queueManager.enqueue('https://instagram.com/p/TEST2');
      
      const url = new URL('http://localhost/api/queue/stream');
      const abortController = new AbortController();
      const request = new Request(url, {
        signal: abortController.signal
      });
      
      const response = await streamGET({ 
        url, 
        request 
      } as any);
      
      expect(response.status).toBe(200);
      expect(response.body).toBeInstanceOf(ReadableStream);
      
      // Abort the request to clean up
      abortController.abort();
    });
  });
  
  // Note: Full SSE stream testing would require more complex setup with
  // ReadableStream readers and async iteration, which is beyond the scope
  // of these basic endpoint validation tests. The above tests verify that:
  // 1. The endpoint responds correctly
  // 2. Headers are set properly for SSE
  // 3. Parameter validation works
  // 4. Stream initialization succeeds
});