import test from 'node:test';
import assert from 'node:assert/strict';
import { createDesk } from './desk.mjs';
test('same key replays without a second decrement', () => {
  const desk = createDesk();
  assert.equal(desk.checkout({ key: 'a', kitId: 701, quantity: 2 }).available, 1);
  assert.equal(desk.checkout({ key: 'a', kitId: 701, quantity: 2 }).replayed, true);
  assert.equal(desk.inventory()[0].available, 1);
});
test('same key with changed request rejects', () => {
  const desk = createDesk();
  desk.checkout({ key: 'a', kitId: 701, quantity: 1 });
  assert.throws(
    () => desk.checkout({ key: 'a', kitId: 701, quantity: 2 }),
    (error) => error.status === 409,
  );
});
test('invalid and excessive quantities preserve stock', () => {
  const desk = createDesk();
  for (const quantity of [0, -1, 1.5, 21, NaN])
    assert.throws(
      () => desk.checkout({ key: 'a', kitId: 701, quantity }),
      (error) => error.status === 422,
    );
  assert.throws(
    () => desk.checkout({ key: 'a', kitId: 701, quantity: 4 }),
    (error) => error.status === 409,
  );
  assert.equal(desk.inventory()[0].available, 3);
});
test('unknown kit rejects and receipt copies do not mutate state', () => {
  const desk = createDesk();
  assert.throws(
    () => desk.checkout({ key: 'a', kitId: 999, quantity: 1 }),
    (error) => error.status === 404,
  );
  const receipt = desk.checkout({ key: 'b', kitId: 701, quantity: 1 });
  receipt.available = 999;
  assert.equal(desk.checkout({ key: 'b', kitId: 701, quantity: 1 }).available, 2);
});