einvoice/test/test.xrechnung-validator.ts

import { tap, expect } from '@git.zone/tstest/tapbundle';
import { XRechnungValidator } from '../ts/formats/validation/xrechnung.validator.js';
import type { EInvoice } from '../ts/einvoice.js';

tap.test('XRechnungValidator - Leitweg-ID validation', async () => {
  const validator = XRechnungValidator.create();
  
  // Create test invoice with XRechnung profile
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-001',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: '04-123456789012-01'
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Valid Leitweg-ID should pass
  const leitwegErrors = results.filter(r => r.ruleId === 'XR-DE-01');
  expect(leitwegErrors).toHaveLength(0);
});

tap.test('XRechnungValidator - Invalid Leitweg-ID', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-002',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: '4-12345-1' // Invalid format
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should have Leitweg-ID format error
  const leitwegErrors = results.filter(r => r.ruleId === 'XR-DE-01');
  expect(leitwegErrors).toHaveLength(1);
  expect(leitwegErrors[0].severity).toEqual('error');
});

tap.test('XRechnungValidator - IBAN validation', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-003',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-123',
      extensions: {
        paymentMeans: [
          {
            type: 'SEPA',
            iban: 'DE89370400440532013000', // Valid German IBAN
            bic: 'COBADEFFXXX'
          }
        ]
      }
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Valid IBAN should pass
  const ibanErrors = results.filter(r => r.ruleId === 'XR-DE-19');
  expect(ibanErrors).toHaveLength(0);
});

tap.test('XRechnungValidator - Invalid IBAN checksum', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-004',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-124',
      extensions: {
        paymentMeans: [
          {
            type: 'SEPA',
            iban: 'DE89370400440532013001' // Invalid checksum
          }
        ]
      }
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should have IBAN checksum error
  const ibanErrors = results.filter(r => r.ruleId === 'XR-DE-19');
  expect(ibanErrors).toHaveLength(1);
  expect(ibanErrors[0].message).toInclude('Invalid IBAN checksum');
});

tap.test('XRechnungValidator - BIC validation', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-005',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-125',
      extensions: {
        paymentMeans: [
          {
            type: 'SEPA',
            iban: 'DE89370400440532013000',
            bic: 'COBADEFF' // Valid 8-character BIC
          }
        ]
      }
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Valid BIC should pass
  const bicErrors = results.filter(r => r.ruleId === 'XR-DE-20');
  expect(bicErrors).toHaveLength(0);
});

tap.test('XRechnungValidator - Invalid BIC format', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-006',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-126',
      extensions: {
        paymentMeans: [
          {
            type: 'SEPA',
            iban: 'DE89370400440532013000',
            bic: 'INVALID' // Invalid BIC format
          }
        ]
      }
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should have BIC format error
  const bicErrors = results.filter(r => r.ruleId === 'XR-DE-20');
  expect(bicErrors).toHaveLength(1);
  expect(bicErrors[0].message).toInclude('Invalid BIC format');
});

tap.test('XRechnungValidator - Mandatory buyer reference', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-007',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0'
      // Missing buyerReference
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should have mandatory buyer reference error
  const refErrors = results.filter(r => r.ruleId === 'XR-DE-15');
  expect(refErrors).toHaveLength(1);
  expect(refErrors[0].severity).toEqual('error');
});

tap.test('XRechnungValidator - Seller contact validation', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-008',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-127',
      extensions: {
        sellerContact: {
          name: 'John Doe',
          email: 'john.doe@example.com',
          phone: '+49 30 12345678'
        }
      }
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Valid seller contact should pass
  const contactErrors = results.filter(r => r.ruleId === 'XR-DE-02');
  expect(contactErrors).toHaveLength(0);
});

tap.test('XRechnungValidator - Missing seller contact', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-009',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-128'
      // Missing sellerContact
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should have missing seller contact error
  const contactErrors = results.filter(r => r.ruleId === 'XR-DE-02');
  expect(contactErrors).toHaveLength(1);
  expect(contactErrors[0].severity).toEqual('error');
});

tap.test('XRechnungValidator - German VAT ID validation', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-010',
    from: {
      type: 'company' as const,
      name: 'Test Company',
      registrationDetails: {
        vatId: 'DE123456789' // Valid German VAT ID format
      }
    },
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-129',
      sellerTaxId: 'DE123456789'
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Valid German VAT ID should pass
  const vatErrors = results.filter(r => r.ruleId === 'XR-DE-04');
  expect(vatErrors).toHaveLength(0);
});

tap.test('XRechnungValidator - Invalid German VAT ID', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-011',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-130',
      sellerTaxId: 'DE12345' // Invalid - too short
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should have invalid VAT ID error
  const vatErrors = results.filter(r => r.ruleId === 'XR-DE-04');
  expect(vatErrors).toHaveLength(1);
  expect(vatErrors[0].message).toInclude('Invalid German VAT ID format');
});

tap.test('XRechnungValidator - Non-XRechnung invoice', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-012',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017' // Not XRechnung
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should not validate non-XRechnung invoices
  expect(results).toHaveLength(0);
});

tap.test('XRechnungValidator - SEPA country validation', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-013',
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: 'REF-131',
      extensions: {
        paymentMeans: [
          {
            type: 'SEPA',
            iban: 'US12345678901234567890123456789' // Non-SEPA country
          }
        ]
      }
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should have warning for non-SEPA country
  const sepaWarnings = results.filter(r => r.ruleId === 'XR-DE-19' && r.severity === 'warning');
  expect(sepaWarnings.length).toBeGreaterThan(0);
  expect(sepaWarnings[0].message).toInclude('not in SEPA zone');
});

tap.test('XRechnungValidator - B2G Leitweg-ID requirement', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-014',
    to: {
      name: 'Bundesamt für Migration' // Public entity
    },
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      // Missing buyerReference for B2G
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Should require Leitweg-ID for B2G
  const b2gErrors = results.filter(r => r.ruleId === 'XR-DE-15');
  expect(b2gErrors).toHaveLength(1);
  expect(b2gErrors[0].message).toInclude('mandatory for B2G invoices');
});

tap.test('XRechnungValidator - Complete valid XRechnung invoice', async () => {
  const validator = XRechnungValidator.create();
  
  const invoice: Partial<EInvoice> = {
    invoiceNumber: 'INV-2025-015',
    from: {
      type: 'company' as const,
      name: 'Example GmbH',
      registrationDetails: {
        vatId: 'DE123456789'
      }
    },
    metadata: {
      profileId: 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0',
      buyerReference: '991-12345678901-23',
      sellerTaxId: 'DE123456789',
      extensions: {
        sellerContact: {
          name: 'Sales Department',
          email: 'sales@example.de',
          phone: '+49 30 98765432'
        },
        paymentMeans: [
          {
            type: 'SEPA',
            iban: 'DE89370400440532013000',
            bic: 'COBADEFFXXX',
            accountName: 'Example GmbH'
          }
        ]
      }
    }
  };
  
  const results = validator.validateXRechnung(invoice as EInvoice);
  
  // Complete valid invoice should have no errors
  const errors = results.filter(r => r.severity === 'error');
  expect(errors).toHaveLength(0);
});

export default tap.start();