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

tap.test('VAL-01: XML Syntax Validation - should validate XML syntax of invoice files', async () => {
  // Get XML test files from various categories
  const ciiFiles = await CorpusLoader.getFiles('CII_XMLRECHNUNG');
  const ublFiles = await CorpusLoader.getFiles('UBL_XMLRECHNUNG');
  const en16931CiiFiles = await CorpusLoader.getFiles('EN16931_CII');
  
  // Combine and limit for testing
  const allXmlFiles = [...ciiFiles, ...ublFiles, ...en16931CiiFiles]
    .filter(f => f.endsWith('.xml'))
    .slice(0, 20); // Test first 20 files
  
  console.log(`Testing XML syntax validation on ${allXmlFiles.length} files`);

  let validCount = 0;
  let invalidCount = 0;
  const errors: { file: string; error: string }[] = [];

  for (const filePath of allXmlFiles) {
    try {
      // Read XML content
      const xmlContent = await fs.readFile(filePath, 'utf-8');

      // Track performance of XML validation
      const { result: isValid } = await PerformanceTracker.track(
        'xml-syntax-validation',
        async () => {
          try {
            // Use DOMParser to validate XML syntax
            const parser = new DOMParser();
            const doc = parser.parseFromString(xmlContent, 'application/xml');
            
            // Check for parsing errors
            const parseError = doc.getElementsByTagName('parsererror');
            if (parseError.length > 0) {
              throw new Error(`XML Parse Error: ${parseError[0].textContent}`);
            }
            
            // Additional basic validation
            if (!doc.documentElement) {
              throw new Error('No document element found');
            }
            
            return true;
          } catch (error) {
            throw error;
          }
        },
        { 
          file: path.basename(filePath),
          size: xmlContent.length 
        }
      );

      if (isValid) {
        validCount++;
      } else {
        invalidCount++;
      }

    } catch (error) {
      invalidCount++;
      errors.push({
        file: path.basename(filePath),
        error: error.message
      });
    }
  }

  // Report results
  console.log(`\nXML Syntax Validation Results:`);
  console.log(`✓ Valid: ${validCount}/${allXmlFiles.length} (${(validCount/allXmlFiles.length*100).toFixed(1)}%)`);
  console.log(`✗ Invalid: ${invalidCount}/${allXmlFiles.length} (${(invalidCount/allXmlFiles.length*100).toFixed(1)}%)`);

  if (errors.length > 0) {
    console.log(`\nValidation Errors:`);
    errors.slice(0, 5).forEach(e => console.log(`  - ${e.file}: ${e.error}`));
    if (errors.length > 5) {
      console.log(`  ... and ${errors.length - 5} more errors`);
    }
  }

  // Performance summary
  const perfSummary = await PerformanceTracker.getSummary('xml-syntax-validation');
  if (perfSummary) {
    console.log(`\nPerformance Summary:`);
    console.log(`  Average: ${perfSummary.average.toFixed(2)}ms`);
    console.log(`  Min: ${perfSummary.min.toFixed(2)}ms`);
    console.log(`  Max: ${perfSummary.max.toFixed(2)}ms`);
    console.log(`  P95: ${perfSummary.p95.toFixed(2)}ms`);
  }

  // Expect high success rate for XML syntax validation
  expect(validCount / allXmlFiles.length).toBeGreaterThan(0.95);
});

tap.test('VAL-01: XML Well-formedness - should validate XML well-formedness', async () => {
  const testCases = [
    {
      name: 'Valid XML',
      xml: `<?xml version="1.0" encoding="UTF-8"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2">
  <ID>TEST-001</ID>
</Invoice>`,
      shouldBeValid: true
    },
    {
      name: 'Invalid XML - Unclosed tag',
      xml: `<?xml version="1.0" encoding="UTF-8"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2">
  <ID>TEST-001</ID>`,
      shouldBeValid: false
    },
    {
      name: 'Invalid XML - Mismatched tags',
      xml: `<?xml version="1.0" encoding="UTF-8"?>
<Invoice>
  <ID>TEST-001</Invoice>
</ID>`,
      shouldBeValid: false
    },
    {
      name: 'Invalid XML - Invalid characters',
      xml: `<?xml version="1.0" encoding="UTF-8"?>
<Invoice>
  <ID>TEST-001 & invalid</ID>
</Invoice>`,
      shouldBeValid: false
    }
  ];

  for (const testCase of testCases) {
    try {
      const { result: isValid } = await PerformanceTracker.track(
        'xml-wellformedness-check',
        async () => {
          try {
            const parser = new DOMParser();
            const doc = parser.parseFromString(testCase.xml, 'application/xml');
            
            const parseError = doc.getElementsByTagName('parsererror');
            return parseError.length === 0 && doc.documentElement !== null;
          } catch (error) {
            return false;
          }
        }
      );

      console.log(`${testCase.name}: ${isValid ? 'Valid' : 'Invalid'}`);
      expect(isValid).toEqual(testCase.shouldBeValid);

    } catch (error) {
      console.log(`${testCase.name}: Error - ${error.message}`);
      expect(testCase.shouldBeValid).toEqual(false);
    }
  }
});

tap.test('VAL-01: XML Encoding Validation - should handle different encodings', async () => {
  const encodingTests = [
    {
      name: 'UTF-8 encoding',
      xml: `<?xml version="1.0" encoding="UTF-8"?>
<Invoice><ID>Tëst-001</ID></Invoice>`,
      encoding: 'utf-8'
    },
    {
      name: 'ISO-8859-1 encoding',
      xml: `<?xml version="1.0" encoding="ISO-8859-1"?>
<Invoice><ID>Test-001</ID></Invoice>`,
      encoding: 'iso-8859-1'
    }
  ];

  for (const test of encodingTests) {
    const { result: isValid } = await PerformanceTracker.track(
      'xml-encoding-validation',
      async () => {
        try {
          const parser = new DOMParser();
          const doc = parser.parseFromString(test.xml, 'application/xml');
          
          const parseError = doc.getElementsByTagName('parsererror');
          return parseError.length === 0;
        } catch (error) {
          return false;
        }
      }
    );

    console.log(`${test.name}: ${isValid ? 'Valid' : 'Invalid'}`);
    expect(isValid).toEqual(true);
  }
});

tap.start();