import { describe, it, expect } from 'vitest';

import { parseReceiptText } from '@/lib/ocr/parse-receipt-text';

describe('parseReceiptText', () => {
  it('extracts vendor, date, total, currency, and line items from a basic English receipt', () => {
    const text = `
Marina Fuel Station
123 Harbor Way
Anguilla

Date: 2026-04-28

Diesel       45.00
Pump Fee     5.00
Subtotal    50.00
Tax          5.00
TOTAL       55.00

Thank you!
`;
    const r = parseReceiptText({ text, ocrConfidence: 92 });
    expect(r.establishment).toBe('Marina Fuel Station');
    expect(r.date).toBe('2026-04-28');
    expect(r.amount).toBe(55);
    expect(r.lineItems.length).toBeGreaterThanOrEqual(1);
    expect(r.lineItems[0]!.description).toMatch(/diesel/i);
    expect(r.confidence).toBeGreaterThan(0.5);
  });

  it('parses European date and comma-decimal amount', () => {
    const text = `
Boulangerie du Port
Rue de la Marina

28/04/2026

Pain      3,50
Café      2,50

Total: 6,00 €
`;
    const r = parseReceiptText({ text });
    expect(r.date).toBe('2026-04-28');
    expect(r.amount).toBe(6);
    expect(r.currency).toBe('EUR');
  });

  it('handles ISO currency codes when no symbol is present', () => {
    const text = `
Receipt
Acme Co.
Total 199.00 USD
`;
    const r = parseReceiptText({ text });
    expect(r.currency).toBe('USD');
  });

  it('returns null fields and zero confidence when nothing parseable', () => {
    const r = parseReceiptText({ text: '@@@\n!!!\n###' });
    expect(r.establishment).toBeNull();
    expect(r.amount).toBeNull();
    expect(r.date).toBeNull();
    expect(r.confidence).toBe(0);
  });

  it('prefers grand total over subtotal even when subtotal is named "total"', () => {
    const text = `
Vendor X

Item A   10.00
Item B   20.00
Subtotal 30.00
Tax       3.00
Grand Total 33.00
`;
    const r = parseReceiptText({ text });
    expect(r.amount).toBe(33);
  });

  it('skips obvious total/subtotal lines when extracting line items', () => {
    const text = `
Boutique
Shirt    25.00
Tie      15.00
Subtotal 40.00
Tax       4.00
Total    44.00
`;
    const r = parseReceiptText({ text });
    const descriptions = r.lineItems.map((li) => li.description.toLowerCase());
    expect(descriptions.some((d) => d.includes('subtotal'))).toBe(false);
    expect(descriptions.some((d) => d.includes('total'))).toBe(false);
    expect(descriptions.some((d) => d.includes('tax'))).toBe(false);
  });

  it('rejects implausible dates', () => {
    const r = parseReceiptText({ text: 'Random 1899-04-12 noise' });
    expect(r.date).toBeNull();
  });
});