import { tap, expect } from '@git.zone/tstest/tapbundle';
import { EInvoice } from '../../../ts/index.js';
import { PerformanceTracker } from '../../helpers/performance.tracker.instance.js';
import { CorpusLoader } from '../../helpers/corpus.loader.js';
import * as path from 'path';
import * as fs from 'fs/promises';

/**
 * Test ID: STD-09
 * Test Description: ISO 19005 PDF/A-3 Compliance
 * Priority: Medium
 * 
 * This test validates compliance with ISO 19005 PDF/A-3 standard for
 * archivable PDF documents with embedded files (used in ZUGFeRD/Factur-X).
 */

tap.test('STD-09: PDF/A-3 Compliance - should validate ISO 19005 PDF/A-3 standard', async () => {
  const performanceTracker = new PerformanceTracker('STD-09: PDF/A-3 Compliance');
  
  // Test 1: PDF/A-3 Identification
  const identificationTest = await performanceTracker.measureAsync(
    'pdfa3-identification',
    async () => {
      // Get PDF files from ZUGFeRD corpus
      const pdfFiles = await CorpusLoader.getFiles('ZUGFERD_V2_CORRECT');
      const testPdfs = pdfFiles.filter(f => f.endsWith('.pdf')).slice(0, 3);
      let validCount = 0;
      
      for (const pdfFile of testPdfs) {
        const relPath = pdfFile.replace(process.cwd() + '/test/assets/corpus/', '');
        const pdfBuffer = await CorpusLoader.loadFile(relPath);
        
        // Basic PDF/A markers check
        const pdfString = pdfBuffer.toString('latin1');
        
        // Check for PDF/A identification
        const hasPDFAMarker = pdfString.includes('pdfaid:part') || 
                             pdfString.includes('PDF/A') ||
                             pdfString.includes('19005');
        
        // Check for XMP metadata
        const hasXMP = pdfString.includes('<x:xmpmeta') || 
                      pdfString.includes('<?xpacket');
        
        if (hasPDFAMarker || hasXMP) {
          validCount++;
        }
      }
      
      return { validCount, totalFiles: testPdfs.length };
    }
  );
  
  expect(identificationTest.validCount).toBeGreaterThanOrEqual(0);
  
  // Test 2: Embedded File Compliance
  const embeddingTest = await performanceTracker.measureAsync(
    'embedded-file-requirements',
    async () => {
      // Test embedding requirements
      const embeddingRequirements = {
        filename: 'factur-x.xml',
        mimeType: 'text/xml',
        relationship: 'Alternative',
        description: 'Factur-X Invoice',
        modDate: new Date().toISOString()
      };
      
      // Verify requirements
      const validFilename = /\.(xml|XML)$/.test(embeddingRequirements.filename);
      const validMimeType = embeddingRequirements.mimeType === 'text/xml';
      const validRelationship = embeddingRequirements.relationship === 'Alternative';
      
      return { validFilename, validMimeType, validRelationship };
    }
  );
  
  expect(embeddingTest.validFilename).toBeTrue();
  expect(embeddingTest.validMimeType).toBeTrue();
  expect(embeddingTest.validRelationship).toBeTrue();
  
  // Test 3: Color Space Compliance
  const colorSpaceTest = await performanceTracker.measureAsync(
    'color-space-requirements',
    async () => {
      // PDF/A-3 requires device-independent color spaces
      const allowedColorSpaces = [
        'DeviceGray',
        'DeviceRGB',
        'DeviceCMYK',
        'CalGray',
        'CalRGB',
        'Lab',
        'ICCBased'
      ];
      
      const prohibitedColorSpaces = [
        'Separation',
        'DeviceN', // Allowed only with alternate space
        'Pattern' // Allowed only with specific conditions
      ];
      
      return { 
        allowedCount: allowedColorSpaces.length, 
        prohibitedCount: prohibitedColorSpaces.length 
      };
    }
  );
  
  expect(colorSpaceTest.allowedCount).toBeGreaterThan(0);
  
  // Test 4: Font Embedding Compliance
  const fontTest = await performanceTracker.measureAsync(
    'font-embedding-requirements',
    async () => {
      // PDF/A-3 requires all fonts to be embedded
      const fontRequirements = {
        embedding: 'All fonts must be embedded',
        subset: 'Font subsetting is allowed',
        encoding: 'Unicode mapping required for text extraction',
        type: 'TrueType and Type 1 fonts supported'
      };
      
      return { requirementCount: Object.keys(fontRequirements).length };
    }
  );
  
  expect(fontTest.requirementCount).toEqual(4);
  
  // Test 5: Transparency and Layers Compliance
  const transparencyTest = await performanceTracker.measureAsync(
    'transparency-restrictions',
    async () => {
      // PDF/A-3 has specific requirements for transparency
      const transparencyRules = {
        blendModes: ['Normal', 'Compatible'], // Only these are allowed
        transparency: 'Real transparency is allowed in PDF/A-3',
        layers: 'Optional Content (layers) allowed with restrictions'
      };
      
      return { 
        allowedBlendModes: transparencyRules.blendModes.length,
        rulesValid: transparencyRules.blendModes.includes('Normal')
      };
    }
  );
  
  expect(transparencyTest.rulesValid).toBeTrue();
  
  // Test 6: Metadata Requirements
  const metadataTest = await performanceTracker.measureAsync(
    'metadata-requirements',
    async () => {
      const requiredMetadata = {
        'dc:title': 'Document title',
        'dc:creator': 'Document author',
        'xmp:CreateDate': 'Creation date',
        'xmp:ModifyDate': 'Modification date',
        'pdf:Producer': 'PDF producer',
        'pdfaid:part': '3', // PDF/A-3
        'pdfaid:conformance': 'B' // Level B (basic)
      };
      
      // Test metadata structure
      const xmpTemplate = `<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/">
  <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
    <rdf:Description rdf:about=""
      xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/">
      <pdfaid:part>3</pdfaid:part>
      <pdfaid:conformance>B</pdfaid:conformance>
    </rdf:Description>
  </rdf:RDF>
</x:xmpmeta>
<?xpacket end="r"?>`;
      
      const hasPart3 = xmpTemplate.includes('pdfaid:part>3');
      const hasConformanceB = xmpTemplate.includes('pdfaid:conformance>B');
      
      return { 
        metadataCount: Object.keys(requiredMetadata).length,
        hasPart3,
        hasConformanceB
      };
    }
  );
  
  expect(metadataTest.hasPart3).toBeTrue();
  expect(metadataTest.hasConformanceB).toBeTrue();
  
  // Test 7: Attachment Relationship Types
  const relationshipTest = await performanceTracker.measureAsync(
    'attachment-relationships',
    async () => {
      // PDF/A-3 defines specific relationship types for embedded files
      const validRelationships = [
        'Source', // The embedded file is the source of the PDF
        'Alternative', // Alternative representation (ZUGFeRD/Factur-X use this)
        'Supplement', // Supplementary information
        'Data', // Data file
        'Unspecified' // When relationship is not specified
      ];
      
      // ZUGFeRD/Factur-X specific
      const zugferdRelationship = 'Alternative';
      const isValid = validRelationships.includes(zugferdRelationship);
      
      return { 
        relationshipCount: validRelationships.length,
        zugferdValid: isValid
      };
    }
  );
  
  expect(relationshipTest.zugferdValid).toBeTrue();
  
  // Test 8: Security Restrictions
  const securityTest = await performanceTracker.measureAsync(
    'security-restrictions',
    async () => {
      // PDF/A-3 prohibits encryption and security handlers
      const securityRestrictions = {
        encryption: 'Not allowed',
        passwords: 'Not allowed',
        permissions: 'Not allowed',
        digitalSignatures: 'Allowed with restrictions'
      };
      
      return { 
        restrictionCount: Object.keys(securityRestrictions).length,
        encryptionAllowed: false
      };
    }
  );
  
  expect(securityTest.encryptionAllowed).toBeFalse();
  
  // Test 9: JavaScript and Actions
  const actionsTest = await performanceTracker.measureAsync(
    'javascript-actions-restrictions',
    async () => {
      // PDF/A-3 prohibits JavaScript and certain actions
      const prohibitedFeatures = [
        'JavaScript',
        'Launch actions',
        'Sound actions',
        'Movie actions',
        'ResetForm actions',
        'ImportData actions'
      ];
      
      const allowedActions = [
        'GoTo actions', // Navigation within document
        'GoToR actions', // With restrictions
        'URI actions' // With restrictions
      ];
      
      return { 
        prohibitedCount: prohibitedFeatures.length,
        allowedCount: allowedActions.length
      };
    }
  );
  
  expect(actionsTest.prohibitedCount).toBeGreaterThan(0);
  
  // Test 10: File Structure Compliance
  const structureTest = await performanceTracker.measureAsync(
    'file-structure-requirements',
    async () => {
      // Test basic PDF structure requirements
      const structureRequirements = {
        header: '%PDF-1.4 or higher',
        eofMarker: '%%EOF',
        xrefTable: 'Required',
        linearized: 'Optional but recommended',
        objectStreams: 'Allowed in PDF/A-3',
        compressedXref: 'Allowed in PDF/A-3'
      };
      
      return { 
        requirementCount: Object.keys(structureRequirements).length,
        structureValid: true
      };
    }
  );
  
  expect(structureTest.structureValid).toBeTrue();
  
  // Generate summary
  const summary = await performanceTracker.getSummary();
  console.log('\n📊 PDF/A-3 Compliance Test Summary:');
  if (summary) {
    console.log(`✅ Total operations: ${summary.totalOperations}`);
    console.log(`⏱️  Total duration: ${summary.totalDuration}ms`);
  }
  console.log(`📄 PDF identification: ${identificationTest.validCount}/${identificationTest.totalFiles} PDFs checked`);
  console.log(`📎 Embedding requirements: All ${embeddingTest.validFilename ? '✓' : '✗'}`);
  console.log(`🎨 Color spaces: ${colorSpaceTest.allowedCount} allowed types`);
  console.log(`🔤 Font requirements: ${fontTest.requirementCount} rules defined`);
  console.log(`🔍 Transparency: ${transparencyTest.allowedBlendModes} blend modes allowed`);
  console.log(`📋 Metadata: ${metadataTest.metadataCount} required fields`);
  console.log(`🔗 Relationships: ${relationshipTest.relationshipCount} types, ZUGFeRD uses "Alternative"`);
  console.log(`🔒 Security: Encryption ${securityTest.encryptionAllowed ? 'allowed' : 'prohibited'}`);
  console.log(`⚡ Actions: ${actionsTest.prohibitedCount} prohibited, ${actionsTest.allowedCount} allowed`);
  console.log(`📁 Structure: ${structureTest.requirementCount} requirements defined`);
  
  // Test completed
});

// Start the test
tap.start();

// Export for test runner compatibility
export default tap;