import { beforeEach, describe, expect, it, vi } from 'vitest'
import {
  readPersistentJsonCache,
  writePersistentJsonCache
} from '@/utils/persistentJsonCache'

describe('persistentJsonCache', () => {
  const values = new Map<string, string>()
  const localStorage = {
    getItem: (key: string) => values.get(key) || null,
    setItem: (key: string, value: string) => values.set(key, value),
    removeItem: (key: string) => values.delete(key),
    clear: () => values.clear()
  }

  beforeEach(() => {
    vi.stubGlobal('window', { localStorage })
    localStorage.clear()
    vi.restoreAllMocks()
  })

  it('stores and reads a fresh JSON payload', () => {
    expect(writePersistentJsonCache('map:manifest', { version: 'v1' }, 60_000)).toBe(true)
    expect(readPersistentJsonCache<{ version: string }>('map:manifest')).toEqual({ version: 'v1' })
  })

  it('keeps expired data only for an explicit stale fallback', () => {
    vi.spyOn(Date, 'now').mockReturnValue(1_000)
    writePersistentJsonCache('map:floor:L1', ['poi-1'], 100)
    vi.spyOn(Date, 'now').mockReturnValue(1_101)

    expect(readPersistentJsonCache<string[]>('map:floor:L1')).toBeNull()
    expect(readPersistentJsonCache<string[]>('map:floor:L1', true)).toEqual(['poi-1'])
  })

  it('does not persist an oversized payload', () => {
    const largePayload = 'x'.repeat(200 * 1024)

    expect(writePersistentJsonCache('map:large', largePayload, 60_000)).toBe(false)
    expect(localStorage.getItem('map:large')).toBeNull()
  })
})