import { chargeableWeightKg, haversineKm, quoteCarrier, rankQuotes } from './freight-calculator';

describe('freight calculator', () => {
  const cargo = {
    weightKg: 10,
    widthCm: 40,
    heightCm: 30,
    lengthCm: 50,
    cargoValue: 1000,
    distanceKm: 200,
  };

  it('uses volumetric weight when it exceeds real weight', () => {
    expect(chargeableWeightKg({ weightKg: 1, widthCm: 100, heightCm: 100, lengthCm: 100 })).toBe(166.667);
  });

  it('quotes base + kg + km + ad valorem', () => {
    const quote = quoteCarrier(
      { id: '1', name: 'Rota Sul', baseFee: 30, pricePerKg: 2, pricePerKm: 0.5, adValoremRate: 0.01 },
      cargo,
    );
    expect(quote.price).toBe(160);
  });

  it('ranks cheapest first', () => {
    const ranked = rankQuotes([
      { carrierId: 'a', carrierName: 'A', price: 90, chargeableKg: 10 },
      { carrierId: 'b', carrierName: 'B', price: 40, chargeableKg: 10 },
    ]);
    expect(ranked[0].carrierId).toBe('b');
  });

  it('uses real weight when it exceeds volumetric weight', () => {
    expect(chargeableWeightKg({ weightKg: 80, widthCm: 10, heightCm: 10, lengthCm: 10 })).toBe(80);
  });

  it('never quotes a negative price', () => {
    const quote = quoteCarrier(
      { id: '1', name: 'X', baseFee: 0, pricePerKg: 0, pricePerKm: 0, adValoremRate: 0 },
      { ...cargo, cargoValue: 0, distanceKm: 0, weightKg: 0, widthCm: 0, heightCm: 0, lengthCm: 0 },
    );
    expect(quote.price).toBe(0);
  });

  it('computes haversine distance in km', () => {
    const km = haversineKm({ lat: -23.55, lon: -46.63 }, { lat: -22.9, lon: -43.2 });
    expect(km).toBeGreaterThan(350);
    expect(km).toBeLessThan(450);
  });
});