import { Prisma } from '@prisma/client';
import { parseTabEvents, tabEventRow } from './tab-events';

const now = new Date('2026-10-24T22:00:00.000Z');

const lineAdded = {
  id: '6f1c2c0e-6a2b-4c1e-9a4c-1f2a3b4c5d6e',
  type: 'line_added',
  tabId: 'tab-1',
  customerName: 'Jan',
  occurredAt: '2026-10-24T21:41:03.120Z',
  productName: 'Cola',
  unitPriceInCents: 250,
  quantity: 2,
};

const settled = {
  id: '7a2d3e4f-5b6c-4d7e-8f9a-0b1c2d3e4f5a',
  type: 'settled',
  tabId: 'tab-1',
  customerName: 'Jan',
  occurredAt: '2026-10-24T21:55:00.000Z',
  amountInCents: 500,
  paymentMethod: 'payconiq',
  items: [{ productName: 'Cola', quantity: 2, unitPriceInCents: 250 }],
};

describe('parseTabEvents', () => {
  it('accepts valid line and settlement events', () => {
    const { accepted, rejected } = parseTabEvents([lineAdded, settled]);

    expect(accepted.map((e) => e.id)).toEqual([lineAdded.id, settled.id]);
    expect(rejected).toEqual([]);
  });

  it('accepts tab and stock events, and a stock count of zero', () => {
    const base = { occurredAt: '2026-10-24T21:00:00.000Z' };
    const { accepted, rejected } = parseTabEvents([
      { ...base, id: '1b2c3d4e-5f6a-4b7c-8d9e-0f1a2b3c4d5e', type: 'tab_opened', tabId: 't1', customerName: 'Jan', openedAt: base.occurredAt },
      { ...base, id: '2c3d4e5f-6a7b-4c8d-9e0f-1a2b3c4d5e6f', type: 'tab_renamed', tabId: 't1', customerName: 'Jan P.' },
      { ...base, id: '3d4e5f6a-7b8c-4d9e-8f1a-2b3c4d5e6f7a', type: 'stock_set', productId: '12', quantity: 0 },
      { ...base, id: '4e5f6a7b-8c9d-4e0f-9a2b-3c4d5e6f7a8b', type: 'stock_set', productId: '12', quantity: null },
    ]);

    expect(rejected).toEqual([]);
    expect(accepted.map((e) => e.type)).toEqual(['tab_opened', 'tab_renamed', 'stock_set', 'stock_set']);
  });

  it('rejects a stock count without a product or below zero, and a tab event without a tab', () => {
    const base = { occurredAt: '2026-10-24T21:00:00.000Z' };
    const { accepted, rejected } = parseTabEvents([
      { ...base, id: '5f6a7b8c-9d0e-4f1a-8b3c-4d5e6f7a8b9c', type: 'stock_set', quantity: 3 },
      { ...base, id: '6a7b8c9d-0e1f-4a2b-9c4d-5e6f7a8b9c0d', type: 'stock_set', productId: '12', quantity: -1 },
      { ...base, id: '7b8c9d0e-1f2a-4b3c-8d5e-6f7a8b9c0d1e', type: 'tab_opened', customerName: 'Jan' },
    ]);

    expect(accepted).toEqual([]);
    expect(rejected).toHaveLength(3);
  });

  it('stores a stock count without a tab', () => {
    const [event] = parseTabEvents([
      { id: '8c9d0e1f-2a3b-4c4d-9e6f-7a8b9c0d1e2f', type: 'stock_set', productId: '12', quantity: 30, occurredAt: '2026-10-24T21:00:00.000Z' },
    ]).accepted;

    expect(tabEventRow(event, 'v1', 'd1', now)).toMatchObject({ type: 'stock_set', tabId: null, productId: '12', stockSetTo: 30 });
  });

  it('rejects invalid events one by one, keeping their id', () => {
    const { accepted, rejected } = parseTabEvents([
      lineAdded,
      { ...lineAdded, id: '8b3e4f5a-6c7d-4e8f-9a0b-1c2d3e4f5a6b', quantity: 0 },
      { ...settled, id: '9c4f5a6b-7d8e-4f9a-0b1c-2d3e4f5a6b7c', paymentMethod: 'bitcoin' },
      { ...lineAdded, id: 'not-a-uuid' },
      'nonsense',
    ]);

    expect(accepted.map((e) => e.id)).toEqual([lineAdded.id]);
    expect(rejected.map((r) => r.id)).toEqual([
      '8b3e4f5a-6c7d-4e8f-9a0b-1c2d3e4f5a6b',
      '9c4f5a6b-7d8e-4f9a-0b1c-2d3e4f5a6b7c',
      'not-a-uuid',
      null,
    ]);
    expect(rejected[0].reason).toMatch(/quantity/);
  });

  it('ignores fields it does not know, so newer app versions keep working', () => {
    const { accepted } = parseTabEvents([{ ...lineAdded, discountInCents: 50 }]);

    expect(accepted).toHaveLength(1);
    expect(accepted[0]).not.toHaveProperty('discountInCents');
  });

  it('rejects line events without a product', () => {
    const { productName, ...withoutProduct } = lineAdded;

    expect(parseTabEvents([withoutProduct]).rejected).toHaveLength(1);
  });
});

describe('tabEventRow', () => {
  it('stores removed lines as a negative quantity', () => {
    const [event] = parseTabEvents([{ ...lineAdded, type: 'line_removed', quantity: 3 }]).accepted;

    expect(tabEventRow(event, 'v1', 'd1', now)).toMatchObject({
      venueId: 'v1',
      deviceId: 'd1',
      type: 'line_removed',
      productName: 'Cola',
      unitPriceInCents: 250,
      quantityDelta: -3,
      occurredAt: new Date(lineAdded.occurredAt),
    });
  });

  it('stores a settlement with its amount, payment method and lines', () => {
    const [event] = parseTabEvents([settled]).accepted;

    const row = tabEventRow(event, 'v1', 'd1', now);

    expect(row).toMatchObject({ type: 'settled', amountInCents: 500, paymentMethod: 'payconiq', commandId: null });
    expect(row.items).toEqual([{ productId: null, productName: 'Cola', quantity: 2, unitPriceInCents: 250 }]);
    expect(row.quantityDelta).toBeUndefined();
  });

  it('stores JSON null for a settlement without lines', () => {
    const { items, ...withoutItems } = settled;
    const [event] = parseTabEvents([withoutItems]).accepted;

    expect(tabEventRow(event, 'v1', 'd1', now).items).toBe(Prisma.JsonNull);
  });

  it('uses the receive time when the terminal clock runs ahead', () => {
    const [event] = parseTabEvents([{ ...lineAdded, occurredAt: '2026-10-25T03:00:00.000Z' }]).accepted;

    expect(tabEventRow(event, 'v1', 'd1', now).occurredAt).toEqual(now);
  });
});