import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { createStorageWrapper } from './storage-wrapper';

describe('createStorageWrapper', () => {
  let hasPrevious: boolean;
  let previous: any;

  beforeEach(() => {
    hasPrevious = 'localStorage' in globalThis;
    previous = globalThis.localStorage;
  });

  afterEach(() => {
    if (hasPrevious) {
      globalThis.localStorage = previous;
    } else {
      Reflect.deleteProperty(globalThis, 'localStorage');
    }

    Reflect.deleteProperty(globalThis, '__i18nStorage');
  });

  it('uses global localStorage if available', () => {
    const mock: any = {};
    globalThis.localStorage = mock;
    expect(createStorageWrapper()).toBe(mock);
  });

  it('uses cached storage if available', () => {
    const mock: any = {};
    Reflect.deleteProperty(globalThis, 'localStorage');
    globalThis.__i18nStorage = mock;
    expect(createStorageWrapper()).toBe(mock);
  });

  it('creates new storage if needed', () => {
    const mock: any = {};

    Reflect.deleteProperty(globalThis, 'localStorage');
    Reflect.deleteProperty(globalThis, '__i18nStorage');

    const original = globalThis.__i18nStorage;
    globalThis.__i18nStorage = mock;

    expect(createStorageWrapper()).toBe(mock);

    globalThis.__i18nStorage = original;
  });
});