import { dropCountOf, dropSummary, isMultiDrop, plural } from '@/lib/bookingDrops';

describe('dropCountOf', () => {
  // The console can ship before or after the backend that adds these fields.
  // An absent count must read as 0 so every multi-drop behaviour stays off and
  // the page renders exactly as it did.
  it('treats an absent destinationcount as zero', () => {
    expect(dropCountOf({})).toBe(0);
    expect(dropCountOf({ destinationcount: undefined })).toBe(0);
    expect(dropCountOf(undefined)).toBe(0);
    expect(dropCountOf(null)).toBe(0);
  });

  it('reads the count the backend sent', () => {
    expect(dropCountOf({ destinationcount: 3 })).toBe(3);
    expect(dropCountOf({ destinationcount: 1 })).toBe(1);
  });

  // A console-created booking has no bookingdestinations rows at all.
  it('keeps a console-created booking at zero', () => {
    expect(dropCountOf({ destinationcount: 0 })).toBe(0);
  });
});

describe('isMultiDrop', () => {
  // THE IMPORTANT ONE. This gate is what stops the Orders row rendering the
  // booking's own consignmentstatus — which is the FIRST leg's status wearing
  // the whole booking's name — as the status of a three-drop pickup.
  it('is true only above one destination', () => {
    expect(isMultiDrop({ destinationcount: 2 })).toBe(true);
    expect(isMultiDrop({ destinationcount: 3 })).toBe(true);
  });

  it('is false for a single drop, so the row keeps todays behaviour', () => {
    expect(isMultiDrop({ destinationcount: 1 })).toBe(false);
  });

  it('is false when the backend has not shipped the field yet', () => {
    expect(isMultiDrop({})).toBe(false);
    expect(isMultiDrop({ bookingid: 7, status: 'converted_to_consignment' })).toBe(false);
  });

  it('is false for a console-created booking reporting zero', () => {
    expect(isMultiDrop({ destinationcount: 0 })).toBe(false);
  });
});

describe('dropSummary', () => {
  it('reads as the handoff specifies', () => {
    expect(dropSummary({ destinationcount: 3, totalpackagecount: 4 })).toBe(
      '3 destinations · 4 packages'
    );
  });

  // Every destination carries at least one package, so a zero package total is
  // a stale or partial response rather than a real booking. Falling back to the
  // destination count keeps the line truthful instead of printing "0 packages".
  it('falls back to the destination count when the package sum is missing', () => {
    expect(dropSummary({ destinationcount: 3 })).toBe('3 destinations · 3 packages');
    expect(dropSummary({ destinationcount: 2, totalpackagecount: 0 })).toBe(
      '2 destinations · 2 packages'
    );
  });

  it('pluralises both nouns independently', () => {
    expect(dropSummary({ destinationcount: 2, totalpackagecount: 1 })).toBe(
      '2 destinations · 1 package'
    );
    expect(dropSummary({ destinationcount: 1, totalpackagecount: 2 })).toBe(
      '1 destination · 2 packages'
    );
  });
});

describe('plural', () => {
  it('keeps the singular at exactly one', () => {
    expect(plural(1, 'package')).toBe('1 package');
    expect(plural(0, 'package')).toBe('0 packages');
    expect(plural(2, 'destination')).toBe('2 destinations');
  });
});