einvoice/test/test.en16931-validators.ts

import { tap, expect } from '@git.zone/tstest/tapbundle';
import { EInvoice } from '../ts/index.js';
import { ValidationLevel } from '../ts/interfaces/common.js';

// Test EN16931 business rules and code list validators
tap.test('EN16931 Validators - should validate business rules with feature flags', async () => {
  // Create a minimal invoice that violates several EN16931 rules
  const invoice = new EInvoice();
  
  // Set some basic fields but leave mandatory ones missing
  invoice.currency = 'EUR';
  invoice.date = Date.now();
  invoice.from = {
    type: 'company',
    name: 'Test Seller',
    address: {
      streetName: 'Test Street',
      houseNumber: '1',
      city: 'Berlin',
      postalCode: '10115',
      countryCode: 'DE'
    }
  } as any;
  
  // Missing buyer details and invoice ID (violates BR-02, BR-07)
  
  // Add an item with calculation issues
  invoice.items = [{
    position: 1,
    name: 'Test Item',
    unitType: 'C62', // Valid UNECE code
    unitQuantity: 10,
    unitNetPrice: 100,
    vatPercentage: 19
  }];
  
  // Test without feature flags (should pass basic validation)
  const basicResult = await invoice.validate(ValidationLevel.BUSINESS);
  console.log('Basic validation errors:', basicResult.errors.length);
  
  // Test with EN16931 business rules feature flag
  const en16931Result = await invoice.validate(ValidationLevel.BUSINESS, {
    featureFlags: ['EN16931_BUSINESS_RULES'],
    checkCalculations: true,
    checkVAT: true
  });
  
  console.log('EN16931 validation errors:', en16931Result.errors.length);
  
  // Should find missing mandatory fields
  const mandatoryErrors = en16931Result.errors.filter(e => 
    e.code && ['BR-01', 'BR-02', 'BR-07'].includes(e.code)
  );
  expect(mandatoryErrors.length).toBeGreaterThan(0);
  
  // Test code list validation
  const codeListResult = await invoice.validate(ValidationLevel.BUSINESS, {
    featureFlags: ['CODE_LIST_VALIDATION'],
    checkCodeLists: true
  });
  
  console.log('Code list validation errors:', codeListResult.errors.length);
  
  // Test invalid currency code
  invoice.currency = 'XXX' as any; // Invalid currency
  const currencyResult = await invoice.validate(ValidationLevel.BUSINESS, {
    featureFlags: ['CODE_LIST_VALIDATION']
  });
  
  const currencyErrors = currencyResult.errors.filter(e => 
    e.code && e.code.includes('BR-CL-03')
  );
  expect(currencyErrors.length).toEqual(1);
  
  // Test with both validators enabled
  const fullResult = await invoice.validate(ValidationLevel.BUSINESS, {
    featureFlags: ['EN16931_BUSINESS_RULES', 'CODE_LIST_VALIDATION'],
    checkCalculations: true,
    checkVAT: true,
    checkCodeLists: true,
    reportOnly: true // Don't fail validation, just report
  });
  
  console.log('Full validation with both validators:');
  console.log('- Total errors:', fullResult.errors.length);
  console.log('- Valid (report-only mode):', fullResult.valid);
  
  expect(fullResult.valid).toEqual(true); // Should be true in report-only mode
  expect(fullResult.errors.length).toBeGreaterThan(0); // Should find issues
  console.log('Error codes found:', fullResult.errors.map(e => e.code));
});

tap.test('EN16931 Validators - should validate calculations correctly', async () => {
  const invoice = new EInvoice();
  
  // Set up a complete invoice with correct mandatory fields
  invoice.accountingDocId = 'INV-2024-001';
  invoice.currency = 'EUR';
  invoice.date = Date.now();
  invoice.metadata = {
    customizationId: 'urn:cen.eu:en16931:2017'
  };
  
  invoice.from = {
    type: 'company',
    name: 'Test Seller GmbH',
    address: {
      streetName: 'Hauptstraße',
      houseNumber: '1',
      city: 'Berlin',
      postalCode: '10115',
      countryCode: 'DE'
    }
  } as any;
  
  invoice.to = {
    type: 'company',
    name: 'Test Buyer Ltd',
    address: {
      streetName: 'Main Street',
      houseNumber: '10',
      city: 'London',
      postalCode: 'SW1A 1AA',
      countryCode: 'GB'
    }
  } as any;
  
  // Add items with specific amounts
  invoice.items = [
    {
      position: 1,
      name: 'Product A',
      unitType: 'C62',
      unitQuantity: 5,
      unitNetPrice: 100.00,
      vatPercentage: 19
    },
    {
      position: 2,
      name: 'Product B',
      unitType: 'C62',
      unitQuantity: 3,
      unitNetPrice: 50.00,
      vatPercentage: 19
    }
  ];
  
  // Expected calculations:
  // Line 1: 5 * 100 = 500
  // Line 2: 3 * 50 = 150
  // Total net: 650
  // VAT (19%): 123.50
  // Total gross: 773.50
  
  const result = await invoice.validate(ValidationLevel.BUSINESS, {
    featureFlags: ['EN16931_BUSINESS_RULES'],
    checkCalculations: true,
    tolerance: 0.01
  });
  
  // Should not have calculation errors
  const calcErrors = result.errors.filter(e => 
    e.code && e.code.startsWith('BR-CO-')
  );
  
  console.log('Calculation validation errors:', calcErrors);
  expect(calcErrors.length).toEqual(0);
  
  // Verify computed totals
  expect(invoice.totalNet).toEqual(650);
  expect(invoice.totalVat).toEqual(123.50);
  expect(invoice.totalGross).toEqual(773.50);
});

tap.test('EN16931 Validators - should validate VAT rules correctly', async () => {
  const invoice = new EInvoice();
  
  // Set up mandatory fields
  invoice.accountingDocId = 'INV-2024-002';
  invoice.currency = 'EUR';
  invoice.date = Date.now();
  invoice.metadata = {
    customizationId: 'urn:cen.eu:en16931:2017'
  };
  
  invoice.from = {
    type: 'company',
    name: 'Seller',
    address: { countryCode: 'DE' }
  } as any;
  
  invoice.to = {
    type: 'company', 
    name: 'Buyer',
    address: { countryCode: 'FR' }
  } as any;
  
  // Add mixed VAT rate items
  invoice.items = [
    {
      position: 1,
      name: 'Standard rated item',
      unitType: 'C62',
      unitQuantity: 1,
      unitNetPrice: 100,
      vatPercentage: 19  // Standard rate
    },
    {
      position: 2,
      name: 'Zero rated item',
      unitType: 'C62',
      unitQuantity: 1,
      unitNetPrice: 100,
      vatPercentage: 0   // Zero rate
    }
  ];
  
  const result = await invoice.validate(ValidationLevel.BUSINESS, {
    featureFlags: ['EN16931_BUSINESS_RULES'],
    checkVAT: true
  });
  
  // Check for VAT breakdown requirements
  const vatErrors = result.errors.filter(e => 
    e.code && (e.code.startsWith('BR-S-') || e.code.startsWith('BR-Z-'))
  );
  
  console.log('VAT validation results:');
  console.log('- VAT errors found:', vatErrors.length);
  console.log('- Tax breakdown:', invoice.taxBreakdown);
  
  // Should have proper tax breakdown
  expect(invoice.taxBreakdown.length).toEqual(2);
  expect(invoice.taxBreakdown.find(t => t.taxPercent === 19)).toBeTruthy();
  expect(invoice.taxBreakdown.find(t => t.taxPercent === 0)).toBeTruthy();
});

export default tap.start();