import { tap, expect } from '@git.zone/tstest/tapbundle';
import { EInvoice, EInvoiceValidationError } from '../ts/index.js';
import { ValidationLevel, InvoiceFormat } from '../ts/interfaces/common.js';
import { TestFileHelpers, TestFileCategories, InvoiceAssertions, PerformanceUtils } from './helpers/utils.js';
import * as plugins from '../ts/plugins.js';

/**
 * Comprehensive validation test suite using EN16931 test cases
 */

// Test Business Rule validations from EN16931
tap.test('Validation Suite - EN16931 Business Rules (BR-*)', async () => {
  const testFiles = await TestFileHelpers.getTestFiles(TestFileCategories.EN16931_UBL_INVOICE, 'BR-*.xml');
  console.log(`Testing ${testFiles.length} Business Rule validation files`);
  
  const results = {
    passed: 0,
    failed: 0,
    errors: [] as string[]
  };
  
  for (const file of testFiles) {
    const fileName = plugins.path.basename(file);
    const shouldFail = fileName.includes('BR-'); // These files test specific BR violations
    
    try {
      const xmlBuffer = await TestFileHelpers.loadTestFile(file);
      let xmlString = xmlBuffer.toString('utf-8');
      
      // These test files wrap the invoice in a testSet element
      // Extract the invoice content if it's a test wrapper
      if (xmlString.includes('<testSet')) {
        // Extract the Invoice element from within the test wrapper
        const invoiceMatch = xmlString.match(/<Invoice[^>]*>[\s\S]*?<\/Invoice>/);
        if (invoiceMatch) {
          // Add proper namespaces to make it a valid UBL invoice
          xmlString = `<?xml version="1.0" encoding="UTF-8"?>
${invoiceMatch[0]}`;
        } else {
          console.log(`✗ ${fileName}: No Invoice element found in test file`);
          results.failed++;
          continue;
        }
      }
      
      const einvoice = await EInvoice.fromXml(xmlString);
      const { result: validation, duration } = await PerformanceUtils.measure(
        'br-validation',
        async () => einvoice.validate(ValidationLevel.BUSINESS)
      );
      
      // Most BR-*.xml files are designed to fail specific business rules
      if (shouldFail && !validation.valid) {
        results.passed++;
        console.log(`✓ ${fileName}: Correctly failed validation (${duration.toFixed(2)}ms)`);
        
        // Check that the correct BR code is in the errors
        const brCode = fileName.match(/BR-\d+/)?.[0];
        if (brCode) {
          const hasCorrectError = validation.errors.some(e => e.code.includes(brCode));
          if (!hasCorrectError) {
            console.log(`  ⚠ Expected error code ${brCode} not found in: ${validation.errors.map(e => e.code).join(', ')}`);
          }
        }
      } else if (!shouldFail && validation.valid) {
        results.passed++;
        console.log(`✓ ${fileName}: Correctly passed validation (${duration.toFixed(2)}ms)`);
      } else {
        results.failed++;
        results.errors.push(`${fileName}: Unexpected result - valid: ${validation.valid}`);
        console.log(`✗ ${fileName}: Unexpected validation result`);
        if (validation.errors.length > 0) {
          console.log(`  Errors: ${validation.errors.map(e => `${e.code}: ${e.message}`).join('; ')}`);
        }
      }
    } catch (error) {
      results.failed++;
      results.errors.push(`${fileName}: ${error.message}`);
      console.log(`✗ ${fileName}: Error - ${error.message}`);
    }
  }
  
  console.log(`\nBusiness Rules Summary: ${results.passed} passed, ${results.failed} failed`);
  if (results.errors.length > 0) {
    console.log('Failures:', results.errors);
  }
  
  // Allow some failures as not all validators may be implemented
  expect(results.passed).toBeGreaterThan(0);
});

// Test Codelist validations
tap.test('Validation Suite - EN16931 Codelist validations (BR-CL-*)', async () => {
  const testFiles = await TestFileHelpers.getTestFiles(TestFileCategories.EN16931_UBL_INVOICE, 'BR-CL-*.xml');
  console.log(`Testing ${testFiles.length} Codelist validation files`);
  
  let validatedCount = 0;
  
  for (const file of testFiles.slice(0, 10)) { // Test first 10 for speed
    const fileName = plugins.path.basename(file);
    
    try {
      const xmlBuffer = await TestFileHelpers.loadTestFile(file);
      let xmlString = xmlBuffer.toString('utf-8');
      
      // These test files wrap the invoice in a testSet element
      // Extract the invoice content if it's a test wrapper
      if (xmlString.includes('<testSet')) {
        const invoiceMatch = xmlString.match(/<Invoice[^>]*>[\s\S]*?<\/Invoice>/);
        if (invoiceMatch) {
          xmlString = `<?xml version="1.0" encoding="UTF-8"?>
${invoiceMatch[0]}`;
        } else {
          console.log(`✗ ${fileName}: No Invoice element found in test file`);
          continue;
        }
      }
      
      const einvoice = await EInvoice.fromXml(xmlString);
      const validation = await einvoice.validate(ValidationLevel.SEMANTIC);
      
      validatedCount++;
      
      // These files test invalid code values
      if (!validation.valid) {
        const clCode = fileName.match(/BR-CL-\d+/)?.[0];
        console.log(`✓ ${fileName}: Detected invalid code (${clCode})`);
      } else {
        console.log(`○ ${fileName}: Validation passed (may need stricter codelist checking)`);
      }
    } catch (error) {
      console.log(`✗ ${fileName}: Error - ${error.message}`);
    }
  }
  
  expect(validatedCount).toBeGreaterThan(0);
  console.log(`Validated ${validatedCount} codelist test files`);
});

// Test syntax validation
tap.test('Validation Suite - Syntax validation levels', async () => {
  const xmlWithError = `<?xml version="1.0"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2">
  <ID>123</ID>
  <IssueDate>not-a-date</IssueDate>
  <InvalidElement>This element doesn't belong here</InvalidElement>
</Invoice>`;
  
  const einvoice = new EInvoice();
  
  // Test that we can catch parsing errors
  try {
    await einvoice.loadXml(xmlWithError);
    
    // Syntax validation should catch schema violations
    const syntaxValidation = await einvoice.validate(ValidationLevel.SYNTAX);
    console.log('Syntax validation:', syntaxValidation.valid ? 'PASSED' : 'FAILED');
    
    if (!syntaxValidation.valid) {
      console.log('Syntax errors found:', syntaxValidation.errors.length);
      syntaxValidation.errors.forEach(err => {
        console.log(`  - ${err.code}: ${err.message}`);
      });
    }
  } catch (error) {
    if (error instanceof EInvoiceValidationError) {
      console.log('✓ Validation error caught correctly');
      console.log(error.getValidationReport());
    }
  }
});

// Test validation error reporting
tap.test('Validation Suite - Error reporting and recovery', async () => {
  const testInvoice = new EInvoice();
  
  // Try to validate without loading XML
  try {
    await testInvoice.validate();
  } catch (error) {
    expect(error).toBeInstanceOf(EInvoiceValidationError);
    if (error instanceof EInvoiceValidationError) {
      // The error might be "Cannot validate: format unknown" since no XML is loaded
      console.log('✓ Empty invoice validation error handled correctly');
      console.log(`  Error: ${error.message}`);
    }
  }
  
  // Test with minimal valid invoice
  testInvoice.id = 'TEST-001';
  testInvoice.invoiceId = 'INV-001';
  testInvoice.from.name = 'Test Seller';
  testInvoice.to.name = 'Test Buyer';
  testInvoice.items = [{
    position: 1,
    name: 'Test Item',
    unitType: 'EA',
    unitQuantity: 1,
    unitNetPrice: 100,
    vatPercentage: 19
  }];
  
  // This should fail because we don't have XML loaded
  try {
    await testInvoice.validate();
  } catch (error) {
    expect(error).toBeInstanceOf(EInvoiceValidationError);
    console.log('✓ Validation requires loaded XML');
  }
});

// Test format-specific validation
tap.test('Validation Suite - Format-specific validation rules', async () => {
  // Test XRechnung specific validation
  const xrechnungFiles = await TestFileHelpers.getTestFiles(
    TestFileCategories.CII_XMLRECHNUNG,
    'XRECHNUNG_*.xml'
  );
  
  if (xrechnungFiles.length > 0) {
    console.log(`Testing ${xrechnungFiles.length} XRechnung files`);
    
    for (const file of xrechnungFiles.slice(0, 3)) {
      const xmlBuffer = await TestFileHelpers.loadTestFile(file);
      const einvoice = await EInvoice.fromXml(xmlBuffer.toString('utf-8'));
      
      const validation = await einvoice.validate(ValidationLevel.BUSINESS);
      console.log(`${plugins.path.basename(file)}: ${validation.valid ? 'VALID' : 'INVALID'}`);
      
      if (!validation.valid && validation.errors.length > 0) {
        console.log(`  First error: ${validation.errors[0].code} - ${validation.errors[0].message}`);
      }
    }
  }
  
  // Test ZUGFeRD specific validation
  console.log('\nTesting ZUGFeRD profile validation:');
  const zugferdPdfs = await TestFileHelpers.getTestFiles(
    TestFileCategories.ZUGFERD_V2_CORRECT,
    '*.pdf'
  );
  
  for (const file of zugferdPdfs.slice(0, 2)) {
    try {
      const pdfBuffer = await TestFileHelpers.loadTestFile(file);
      const einvoice = await EInvoice.fromPdf(pdfBuffer);
      
      // Check which ZUGFeRD profile is used
      const format = einvoice.getFormat();
      console.log(`${plugins.path.basename(file)}: Format ${format}`);
      
      // Validate according to profile
      const validation = await einvoice.validate(ValidationLevel.SEMANTIC);
      console.log(`  Validation: ${validation.valid ? 'VALID' : 'INVALID'}`);
    } catch (error) {
      console.log(`${plugins.path.basename(file)}: Skipped - ${error.message}`);
    }
  }
});

// Test validation performance
tap.test('Validation Suite - Performance benchmarks', async () => {
  const files = await TestFileHelpers.getTestFiles(
    TestFileCategories.UBL_XMLRECHNUNG,
    '*.xml'
  );
  
  if (files.length > 0) {
    const xmlBuffer = await TestFileHelpers.loadTestFile(files[0]);
    const xmlString = xmlBuffer.toString('utf-8');
    const einvoice = await EInvoice.fromXml(xmlString);
    
    // Benchmark different validation levels
    console.log('\nValidation Performance:');
    
    // Syntax validation
    const syntaxTimes: number[] = [];
    for (let i = 0; i < 10; i++) {
      const { duration } = await PerformanceUtils.measure(
        'syntax-validation',
        async () => einvoice.validate(ValidationLevel.SYNTAX)
      );
      syntaxTimes.push(duration);
    }
    const avgSyntax = syntaxTimes.reduce((a, b) => a + b) / syntaxTimes.length;
    console.log(`Syntax validation: avg ${avgSyntax.toFixed(2)}ms`);
    
    // Semantic validation
    const semanticTimes: number[] = [];
    for (let i = 0; i < 10; i++) {
      const { duration } = await PerformanceUtils.measure(
        'semantic-validation',
        async () => einvoice.validate(ValidationLevel.SEMANTIC)
      );
      semanticTimes.push(duration);
    }
    const avgSemantic = semanticTimes.reduce((a, b) => a + b) / semanticTimes.length;
    console.log(`Semantic validation: avg ${avgSemantic.toFixed(2)}ms`);
    
    // Business validation
    const businessTimes: number[] = [];
    for (let i = 0; i < 10; i++) {
      const { duration } = await PerformanceUtils.measure(
        'business-validation',
        async () => einvoice.validate(ValidationLevel.BUSINESS)
      );
      businessTimes.push(duration);
    }
    const avgBusiness = businessTimes.reduce((a, b) => a + b) / businessTimes.length;
    console.log(`Business validation: avg ${avgBusiness.toFixed(2)}ms`);
    
    // Validation should get progressively slower with higher levels
    expect(avgSyntax).toBeLessThan(avgSemantic);
    expect(avgSemantic).toBeLessThan(avgBusiness);
  }
});

// Test calculation validations
tap.test('Validation Suite - Calculation and sum validations', async () => {
  const einvoice = new EInvoice();
  einvoice.id = 'CALC-TEST-001';
  einvoice.invoiceId = 'CALC-001';
  einvoice.from.name = 'Calculator Corp';
  einvoice.to.name = 'Number Inc';
  
  // Add items with specific calculations
  einvoice.items = [
    {
      position: 1,
      name: 'Product A',
      unitType: 'EA',
      unitQuantity: 5,
      unitNetPrice: 100,  // Total: 500
      vatPercentage: 19   // VAT: 95
    },
    {
      position: 2,
      name: 'Product B',
      unitType: 'EA',
      unitQuantity: 3,
      unitNetPrice: 50,   // Total: 150
      vatPercentage: 19   // VAT: 28.50
    }
  ];
  
  // Expected totals:
  // Net: 650
  // VAT: 123.50
  // Gross: 773.50
  
  // Generate XML and validate
  try {
    const xml = await einvoice.exportXml('facturx');
    await einvoice.loadXml(xml);
    
    const validation = await einvoice.validate(ValidationLevel.BUSINESS);
    
    if (!validation.valid) {
      const calcErrors = validation.errors.filter(e => 
        e.code.includes('BR-CO') || e.message.toLowerCase().includes('calc')
      );
      
      if (calcErrors.length > 0) {
        console.log('Calculation validation errors found:');
        calcErrors.forEach(err => {
          console.log(`  - ${err.code}: ${err.message}`);
        });
      }
    } else {
      console.log('✓ Invoice calculations validated successfully');
    }
  } catch (error) {
    console.log(`Calculation validation test skipped: ${error.message}`);
  }
});

// Test validation caching
tap.test('Validation Suite - Validation result caching', async () => {
  const xmlBuffer = await TestFileHelpers.loadTestFile(
    `${TestFileCategories.UBL_XMLRECHNUNG}/EN16931_Einfach.ubl.xml`
  );
  const einvoice = await EInvoice.fromXml(xmlBuffer.toString('utf-8'));
  
  // First validation (cold)
  const { duration: coldDuration } = await PerformanceUtils.measure(
    'validation-cold',
    async () => einvoice.validate(ValidationLevel.BUSINESS)
  );
  
  // Second validation (potentially cached)
  const { duration: warmDuration } = await PerformanceUtils.measure(
    'validation-warm',
    async () => einvoice.validate(ValidationLevel.BUSINESS)
  );
  
  console.log(`Cold validation: ${coldDuration.toFixed(2)}ms`);
  console.log(`Warm validation: ${warmDuration.toFixed(2)}ms`);
  
  // Check if errors are consistent
  const errors1 = einvoice.getValidationErrors();
  const errors2 = einvoice.getValidationErrors();
  expect(errors1).toEqual(errors2);
});

// Generate validation summary
tap.test('Validation Suite - Summary Report', async () => {
  const stats = PerformanceUtils.getStats('br-validation');
  if (stats) {
    console.log('\nBusiness Rule Validation Performance:');
    console.log(`  Total validations: ${stats.count}`);
    console.log(`  Average time: ${stats.avg.toFixed(2)}ms`);
    console.log(`  Min/Max: ${stats.min.toFixed(2)}ms / ${stats.max.toFixed(2)}ms`);
  }
  
  // Test that validation is generally performant
  if (stats && stats.count > 10) {
    expect(stats.avg).toBeLessThan(100); // Should validate in under 100ms on average
  }
});

tap.start();