/**
 * Unit Tests: Sitemap Generator
 * 
 * Tests T035-T037, T040: Test sitemap XML generation and transformations
 * Tests the sitemap-generator.js module in isolation
 * 
 * @module tests/unit/sitemap-generator
 */

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

// =============================================================================
// T035: Unit test for sitemap XML generation
// =============================================================================

describe('T035: Sitemap XML Generation', () => {
  it('should generate valid sitemap XML with correct structure', () => {
    // Mock sitemap entries
    const mockEntries = [
      {
        loc: 'http://localhost:3000/documents/doc1',
        lastmod: '2024-03-01'
      },
      {
        loc: 'http://localhost:3000/documents/doc2',
        lastmod: '2024-03-02'
      }
    ];

    // TODO: Import generateSitemapXML from src/sitemap-generator.js
    // const { generateSitemapXML } = await import('../../src/sitemap-generator.js');
    // const xml = generateSitemapXML(mockEntries);

    // Verify XML structure
    const expectedXml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>http://localhost:3000/documents/doc1</loc>
    <lastmod>2024-03-01</lastmod>
  </url>
  <url>
    <loc>http://localhost:3000/documents/doc2</loc>
    <lastmod>2024-03-02</lastmod>
  </url>
</urlset>`;

    // assert.ok(xml.includes('<?xml version="1.0" encoding="UTF-8"?>'), 'Should have XML declaration');
    // assert.ok(xml.includes('<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">'), 'Should have urlset with namespace');
    // assert.ok(xml.includes('</urlset>'), 'Should close urlset');
    // assert.ok(xml.includes('<loc>http://localhost:3000/documents/doc1</loc>'), 'Should include first URL');
    // assert.ok(xml.includes('<loc>http://localhost:3000/documents/doc2</loc>'), 'Should include second URL');
  });

  it('should generate URL entries in correct RESTful format /documents/{documentId}', () => {
    const mockEntries = [
      {
        loc: 'http://localhost:3000/documents/abc123',
        lastmod: '2024-03-01'
      }
    ];

    // TODO: Import generateSitemapXML
    // const { generateSitemapXML } = await import('../../src/sitemap-generator.js');
    // const xml = generateSitemapXML(mockEntries);

    // Verify RESTful URL format
    // assert.match(xml, /<loc>http:\/\/localhost:3000\/documents\/abc123<\/loc>/, 'Should use RESTful URL format');
  });

  it('should generate empty sitemap when no entries provided', () => {
    const mockEntries = [];

    // TODO: Import generateSitemapXML
    // const { generateSitemapXML } = await import('../../src/sitemap-generator.js');
    // const xml = generateSitemapXML(mockEntries);

    // Verify empty sitemap structure
    // assert.ok(xml.includes('<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">'), 'Should have urlset');
    // assert.ok(xml.includes('</urlset>'), 'Should close urlset');
    // assert.ok(!xml.includes('<url>'), 'Should not contain any url entries');
  });
});

// =============================================================================
// T036: Unit test for Document to SitemapEntry transformation
// =============================================================================

describe('T036: Document to SitemapEntry Transformation', () => {
  it('should transform Document to SitemapEntry with correct URL format', () => {
    // Mock Document from Drive API
    const mockDocument = {
      id: 'abc123',
      name: 'Test Document',
      mimeType: 'application/pdf',
      modifiedTime: '2024-03-01T10:30:00Z'
    };

    const baseUrl = 'http://localhost:3000';

    // TODO: Import toSitemapEntry from src/sitemap-generator.js
    // const { toSitemapEntry } = await import('../../src/sitemap-generator.js');
    // const entry = toSitemapEntry(mockDocument, baseUrl);

    // Verify transformation
    // assert.equal(entry.loc, 'http://localhost:3000/documents/abc123', 'Should construct URL with baseUrl + /documents/ + documentId');
    // assert.equal(entry.lastmod, '2024-03-01', 'Should format lastmod as YYYY-MM-DD');
  });

  it('should use encodeURIComponent for document ID in URL', () => {
    // Document ID with special characters that need URL encoding
    const mockDocument = {
      id: 'doc with spaces',
      name: 'Test',
      mimeType: 'application/pdf',
      modifiedTime: '2024-03-01T10:30:00Z'
    };

    const baseUrl = 'http://localhost:3000';

    // TODO: Import toSitemapEntry
    // const { toSitemapEntry } = await import('../../src/sitemap-generator.js');
    // const entry = toSitemapEntry(mockDocument, baseUrl);

    // Verify URL encoding
    // assert.equal(entry.loc, 'http://localhost:3000/documents/doc%20with%20spaces', 'Should URL-encode document ID');
  });

  it('should concatenate baseUrl + /documents/ + documentId correctly', () => {
    const testCases = [
      {
        baseUrl: 'http://localhost:3000',
        documentId: 'doc1',
        expected: 'http://localhost:3000/documents/doc1'
      },
      {
        baseUrl: 'https://example.com',
        documentId: 'doc2',
        expected: 'https://example.com/documents/doc2'
      },
      {
        baseUrl: 'http://localhost:3000/',  // With trailing slash
        documentId: 'doc3',
        expected: 'http://localhost:3000/documents/doc3'  // Should handle trailing slash
      }
    ];

    // TODO: Import toSitemapEntry
    // const { toSitemapEntry } = await import('../../src/sitemap-generator.js');

    testCases.forEach(testCase => {
      const mockDocument = {
        id: testCase.documentId,
        name: 'Test',
        mimeType: 'application/pdf'
      };

      // const entry = toSitemapEntry(mockDocument, testCase.baseUrl);
      // assert.equal(entry.loc, testCase.expected, `Should correctly concatenate URL for baseUrl: ${testCase.baseUrl}`);
    });
  });

  it('should handle documents without modifiedTime', () => {
    const mockDocument = {
      id: 'doc1',
      name: 'Test Document',
      mimeType: 'application/pdf'
      // No modifiedTime
    };

    const baseUrl = 'http://localhost:3000';

    // TODO: Import toSitemapEntry
    // const { toSitemapEntry } = await import('../../src/sitemap-generator.js');
    // const entry = toSitemapEntry(mockDocument, baseUrl);

    // Verify lastmod is undefined or omitted
    // assert.equal(entry.loc, 'http://localhost:3000/documents/doc1', 'Should have loc');
    // assert.equal(entry.lastmod, undefined, 'Should not have lastmod when modifiedTime is missing');
  });
});

// =============================================================================
// T037: Unit test for lastmod date formatting
// =============================================================================

describe('T037: lastmod Date Formatting', () => {
  it('should format modifiedTime as ISO 8601 date (YYYY-MM-DD)', () => {
    const testCases = [
      {
        modifiedTime: '2024-03-01T10:30:00Z',
        expected: '2024-03-01'
      },
      {
        modifiedTime: '2024-12-31T23:59:59Z',
        expected: '2024-12-31'
      },
      {
        modifiedTime: '2024-01-15T00:00:00Z',
        expected: '2024-01-15'
      }
    ];

    // TODO: Import formatLastmod or toSitemapEntry
    // const { toSitemapEntry } = await import('../../src/sitemap-generator.js');

    testCases.forEach(testCase => {
      const mockDocument = {
        id: 'doc1',
        name: 'Test',
        mimeType: 'application/pdf',
        modifiedTime: testCase.modifiedTime
      };

      // const entry = toSitemapEntry(mockDocument, 'http://localhost:3000');
      // assert.equal(entry.lastmod, testCase.expected, `Should format ${testCase.modifiedTime} as ${testCase.expected}`);
    });
  });

  it('should extract date part from ISO 8601 timestamp', () => {
    // modifiedTime from Drive API is full ISO 8601 timestamp
    const modifiedTime = '2024-03-01T10:30:45.123Z';

    // TODO: Import formatLastmod or toSitemapEntry
    // const { toSitemapEntry } = await import('../../src/sitemap-generator.js');

    const mockDocument = {
      id: 'doc1',
      name: 'Test',
      mimeType: 'application/pdf',
      modifiedTime
    };

    // const entry = toSitemapEntry(mockDocument, 'http://localhost:3000');

    // Should extract only date part (YYYY-MM-DD)
    // assert.equal(entry.lastmod, '2024-03-01', 'Should extract date part only');
    // assert.match(entry.lastmod, /^\d{4}-\d{2}-\d{2}$/, 'Should match YYYY-MM-DD format');
  });

  it('should handle different timezone formats in modifiedTime', () => {
    const testCases = [
      '2024-03-01T10:30:00Z',           // UTC
      '2024-03-01T10:30:00+00:00',      // UTC with offset
      '2024-03-01T10:30:00-08:00',      // PST
      '2024-03-01T10:30:00+05:30'       // IST
    ];

    // TODO: Import toSitemapEntry
    // const { toSitemapEntry } = await import('../../src/sitemap-generator.js');

    testCases.forEach(modifiedTime => {
      const mockDocument = {
        id: 'doc1',
        name: 'Test',
        mimeType: 'application/pdf',
        modifiedTime
      };

      // const entry = toSitemapEntry(mockDocument, 'http://localhost:3000');
      
      // Should parse all timezone formats correctly
      // assert.match(entry.lastmod, /^\d{4}-\d{2}-\d{2}$/, `Should format date correctly for ${modifiedTime}`);
    });
  });
});

// =============================================================================
// T040: Unit test for XML special character escaping
// =============================================================================

describe('T040: XML Special Character Escaping', () => {
  it('should escape ampersand (&) as &amp;', () => {
    const url = 'http://localhost:3000/documents/doc&test';

    // TODO: Import escapeXml from src/xml-utils.js
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml(url);

    // assert.equal(escaped, 'http://localhost:3000/documents/doc&amp;test', 'Should escape & as &amp;');
    // assert.ok(!escaped.includes('&test'), 'Should not contain unescaped &');
  });

  it('should escape less than (<) as &lt;', () => {
    const url = 'http://localhost:3000/documents/doc<123';

    // TODO: Import escapeXml
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml(url);

    // assert.equal(escaped, 'http://localhost:3000/documents/doc&lt;123', 'Should escape < as &lt;');
  });

  it('should escape greater than (>) as &gt;', () => {
    const url = 'http://localhost:3000/documents/doc>456';

    // TODO: Import escapeXml
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml(url);

    // assert.equal(escaped, 'http://localhost:3000/documents/doc&gt;456', 'Should escape > as &gt;');
  });

  it('should escape double quote (") as &quot;', () => {
    const url = 'http://localhost:3000/documents/doc"test';

    // TODO: Import escapeXml
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml(url);

    // assert.equal(escaped, 'http://localhost:3000/documents/doc&quot;test', 'Should escape " as &quot;');
  });

  it('should escape single quote (\') as &apos;', () => {
    const url = "http://localhost:3000/documents/doc'xyz";

    // TODO: Import escapeXml
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml(url);

    // assert.equal(escaped, "http://localhost:3000/documents/doc&apos;xyz", "Should escape ' as &apos;");
  });

  it('should escape multiple special characters in same string', () => {
    const url = 'http://localhost:3000/documents/a&b<c>d"e\'f';

    // TODO: Import escapeXml
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml(url);

    // assert.equal(
    //   escaped,
    //   'http://localhost:3000/documents/a&amp;b&lt;c&gt;d&quot;e&apos;f',
    //   'Should escape all special characters'
    // );
  });

  it('should not double-escape already escaped characters', () => {
    const url = 'http://localhost:3000/documents/doc&amp;test';

    // TODO: Import escapeXml
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml(url);

    // Should not double-escape
    // assert.ok(!escaped.includes('&amp;amp;'), 'Should not double-escape &amp;');
  });

  it('should handle empty string', () => {
    // TODO: Import escapeXml
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml('');

    // assert.equal(escaped, '', 'Should return empty string for empty input');
  });

  it('should handle string with no special characters', () => {
    const url = 'http://localhost:3000/documents/doc123';

    // TODO: Import escapeXml
    // const { escapeXml } = await import('../../src/xml-utils.js');
    // const escaped = escapeXml(url);

    // assert.equal(escaped, url, 'Should return unchanged string when no special chars');
  });
});