import {
  assertShipment,
  assertReturn,
  advanceTracking,
} from '../src/fulfillment/fulfillment.policy';
describe('shipping and return blueprint policies', () => {
  it('requires payment and bounds partial shipments', () => {
    expect(() => assertShipment(true, 5, 2, 3)).not.toThrow();
    expect(() => assertShipment(false, 5, 0, 1)).toThrow();
    for (const quantity of [0, -1, 0.5, 4])
      expect(() => assertShipment(true, 5, 2, quantity)).toThrow();
    expect(() => assertShipment(true, 0, 0, 1)).toThrow();
    expect(() => assertShipment(true, 5, -1, 1)).toThrow();
  });
  it('does not regress tracking on duplicated or out-of-order events', () => {
    expect(advanceTracking('PLANNED', 'SHIPPED')).toBe('SHIPPED');
    expect(advanceTracking('SHIPPED', 'DELIVERED')).toBe('DELIVERED');
    expect(advanceTracking('DELIVERED', 'SHIPPED')).toBe('DELIVERED');
    expect(advanceTracking('DELIVERED', 'DELIVERED')).toBe('DELIVERED');
  });
  it('counts existing and pending returns and enforces the configured window', () => {
    const input = {
      delivered: 5,
      returned: 1,
      pending: 1,
      requested: 3,
      deliveredAt: new Date(0),
      now: new Date(86400000),
      windowDays: 1,
    };
    expect(() => assertReturn(input)).not.toThrow();
    for (const change of [
      { requested: 4 },
      { requested: 0 },
      { requested: 0.5 },
      { delivered: -1 },
      { now: new Date(86400001) },
      { now: new Date(-1) },
      { windowDays: -1 },
      { deliveredAt: new Date('invalid') },
    ])
      expect(() => assertReturn({ ...input, ...change })).toThrow();
  });
});