/**
 * Integration Tests: /sitemap.xml Endpoint
 * 
 * Tests T024, T030: End-to-end tests for sitemap generation
 * Tests the complete flow: HTTP request → auth → Drive API → sitemap generation → HTTP response
 * 
 * @module tests/integration/sitemap-endpoint
 */

import { describe, it, before, after } from 'node:test';
import assert from 'node:assert/strict';
import http from 'node:http';

// =============================================================================
// T024: Integration test for /sitemap.xml endpoint success scenario
// =============================================================================

describe('T024: /sitemap.xml Endpoint Success Integration', () => {
  let server;
  const TEST_PORT = 3001;

  before(async () => {
    // TODO: Start server with mocked Drive API
    // This will be implemented when src/server.js is complete
  });

  after(async () => {
    // TODO: Stop server
    if (server) {
      server.close();
    }
  });

  it('should return 200 with valid sitemap XML when Drive API returns documents', async () => {
    // Mock Drive API to return sample documents
    const mockDriveDocuments = [
      {
        id: 'doc1',
        name: 'Test Document 1',
        mimeType: 'application/pdf',
        modifiedTime: '2024-03-01T10:30:00Z'
      },
      {
        id: 'doc2',
        name: 'Test Document 2',
        mimeType: 'text/plain',
        modifiedTime: '2024-03-02T15:45:00Z'
      }
    ];

    // Make HTTP request to /sitemap.xml
    const response = await makeRequest(`http://localhost:${TEST_PORT}/sitemap.xml`);

    // Verify response
    assert.equal(response.statusCode, 200, 'Should return 200 OK');
    assert.equal(
      response.headers['content-type'],
      'application/xml; charset=utf-8',
      'Should return XML content type'
    );

    // Verify XML structure
    assert.match(response.body, /<urlset xmlns="http:\/\/www\.sitemaps\.org\/schemas\/sitemap\/0\.9">/, 'Should have valid urlset');
    assert.match(response.body, /<url>/, 'Should contain URL entries');
    assert.match(response.body, /<loc>.*\/documents\/doc1<\/loc>/, 'Should contain doc1 URL');
    assert.match(response.body, /<loc>.*\/documents\/doc2<\/loc>/, 'Should contain doc2 URL');
    assert.match(response.body, /<lastmod>2024-03-01<\/lastmod>/, 'Should contain formatted lastmod');
  });

  it('should return 200 with empty sitemap when Drive has no documents', async () => {
    // Mock Drive API to return empty result
    const response = await makeRequest(`http://localhost:${TEST_PORT}/sitemap.xml`);

    assert.equal(response.statusCode, 200, 'Should return 200 OK for empty Drive');
    assert.match(response.body, /<urlset xmlns="http:\/\/www\.sitemaps\.org\/schemas\/sitemap\/0\.9">/, 'Should have urlset');
    assert.match(response.body, /<\/urlset>/, 'Should close urlset');
    assert.doesNotMatch(response.body, /<url>/, 'Should not contain any url entries');
  });
});

// =============================================================================
// T030: Integration test for Service Account token refresh
// =============================================================================

describe('T030: Service Account Token Refresh Integration', () => {
  it('should handle token expiry and refresh automatically', async () => {
    // Mock scenario: first request succeeds, token expires, second request triggers refresh
    
    // First request - should succeed with valid token
    const response1 = await makeRequest(`http://localhost:${TEST_PORT}/sitemap.xml`);
    assert.equal(response1.statusCode, 200, 'First request should succeed');

    // TODO: Mock token expiry by manipulating auth client
    
    // Second request - should auto-refresh token and succeed
    const response2 = await makeRequest(`http://localhost:${TEST_PORT}/sitemap.xml`);
    assert.equal(response2.statusCode, 200, 'Second request should succeed after token refresh');
  });

  it('should return 401 if token refresh fails', async () => {
    // Mock scenario: token expires and refresh fails (invalid credentials)
    
    // TODO: Mock googleapis auth to fail on refresh
    
    const response = await makeRequest(`http://localhost:${TEST_PORT}/sitemap.xml`);
    assert.equal(response.statusCode, 401, 'Should return 401 when auth fails');
    
    // Verify no response body (per spec: status code only errors)
    assert.equal(response.body, '', 'Should have no response body for errors');
  });
});

// =============================================================================
// Helper Functions
// =============================================================================

/**
 * Make HTTP request and return response
 * @param {string} url - Full URL to request
 * @returns {Promise<Object>} Response object with statusCode, headers, body
 */
function makeRequest(url) {
  return new Promise((resolve, reject) => {
    http.get(url, (res) => {
      let body = '';
      res.on('data', chunk => body += chunk);
      res.on('end', () => {
        resolve({
          statusCode: res.statusCode,
          headers: res.headers,
          body
        });
      });
    }).on('error', reject);
  });
}