import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { DISPLAY_NAME_KEY, rememberDisplayName, rememberedDisplayName } from './display-name';

beforeEach(() => {
  localStorage.clear();
});

afterEach(() => {
  vi.restoreAllMocks();
  localStorage.clear();
});

describe('gemerkter Anzeigename (localStorage)', () => {
  it('der Schlüssel heißt aircard.displayName', () => {
    expect(DISPLAY_NAME_KEY).toBe('aircard.displayName');
  });

  it('ohne gespeicherten Namen ist er leer', () => {
    expect(rememberedDisplayName()).toBe('');
  });

  it('liest den gespeicherten Namen', () => {
    localStorage.setItem(DISPLAY_NAME_KEY, 'Kenso');
    expect(rememberedDisplayName()).toBe('Kenso');
  });

  it('speichert den Namen getrimmt unter dem Schlüssel und überschreibt den alten', () => {
    rememberDisplayName('  Kenso ');
    expect(localStorage.getItem(DISPLAY_NAME_KEY)).toBe('Kenso');
    rememberDisplayName('Zoë');
    expect(localStorage.getItem(DISPLAY_NAME_KEY)).toBe('Zoë');
    expect(rememberedDisplayName()).toBe('Zoë');
  });

  it.each([[''], ['   ']])('ein leerer Name (%j) entfernt den Schlüssel („Anonym“)', (empty) => {
    localStorage.setItem(DISPLAY_NAME_KEY, 'Kenso');
    rememberDisplayName(empty);
    expect(localStorage.getItem(DISPLAY_NAME_KEY)).toBeNull();
    expect(rememberedDisplayName()).toBe('');
  });

  it('gesperrter Speicher beim Lesen: leer, kein Fehler', () => {
    vi.spyOn(Storage.prototype, 'getItem').mockImplementation(() => {
      throw new DOMException('gesperrt', 'SecurityError');
    });
    expect(rememberedDisplayName()).toBe('');
  });

  it('gesperrter Speicher beim Schreiben und beim Entfernen: kein Fehler', () => {
    vi.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
      throw new DOMException('voll', 'QuotaExceededError');
    });
    vi.spyOn(Storage.prototype, 'removeItem').mockImplementation(() => {
      throw new DOMException('gesperrt', 'SecurityError');
    });
    expect(() => rememberDisplayName('Kenso')).not.toThrow();
    expect(() => rememberDisplayName('')).not.toThrow();
  });
});