import { describe, expect, it } from 'vitest';
import {
  readCachedPaymentLink,
  writeCachedPaymentLink,
} from './paymentLinkCache';

function createMockStorage(): Storage {
  const store = new Map<string, string>();
  return {
    getItem: (key: string) => store.get(key) ?? null,
    setItem: (key: string, value: string) => void store.set(key, value),
    removeItem: (key: string) => void store.delete(key),
    clear: () => store.clear(),
    key: () => null,
    get length() {
      return store.size;
    },
  };
}

describe('payment link cache', () => {
  it('returns null when nothing is cached', () => {
    expect(readCachedPaymentLink(createMockStorage())).toBeNull();
  });

  it('round-trips a cached link', () => {
    const storage = createMockStorage();
    writeCachedPaymentLink(storage, 'https://paypal.me/alice');
    expect(readCachedPaymentLink(storage)).toBe('https://paypal.me/alice');
  });

  it('overwrites a previously cached link', () => {
    const storage = createMockStorage();
    writeCachedPaymentLink(storage, 'https://paypal.me/alice');
    writeCachedPaymentLink(storage, 'https://paypal.me/bob');
    expect(readCachedPaymentLink(storage)).toBe('https://paypal.me/bob');
  });
});