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')
  })
})