import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
import { clearCachedData } from '../clear-cached-data';

describe('clearCachedData', () => {
  let reload: ReturnType<typeof vi.fn>;
  let originalLocation: Location;

  beforeEach(() => {
    localStorage.clear();
    reload = vi.fn();
    originalLocation = window.location;
    Object.defineProperty(window, 'location', {
      configurable: true,
      value: { ...originalLocation, reload },
    });
  });

  afterEach(() => {
    Object.defineProperty(window, 'location', { configurable: true, value: originalLocation });
  });

  it('clears re-fetchable caches but keeps accounts, sessions and prefs', () => {
    localStorage.setItem('contact-storage', '1');
    localStorage.setItem('calendar-storage', '1');
    localStorage.setItem('identity-storage', '1');
    localStorage.setItem('calendar-notification-storage', '1');
    localStorage.setItem('email-snapshot', '{"v":2}');
    // Must survive — losing these is exactly the pain we're avoiding.
    localStorage.setItem('account-registry', 'accounts');
    localStorage.setItem('auth-storage', 'session');
    localStorage.setItem('settings-storage', 'prefs');
    localStorage.setItem('template-storage', 'my templates');

    clearCachedData();

    expect(localStorage.getItem('contact-storage')).toBeNull();
    expect(localStorage.getItem('calendar-storage')).toBeNull();
    expect(localStorage.getItem('identity-storage')).toBeNull();
    expect(localStorage.getItem('calendar-notification-storage')).toBeNull();
    expect(localStorage.getItem('email-snapshot')).toBeNull();

    expect(localStorage.getItem('account-registry')).toBe('accounts');
    expect(localStorage.getItem('auth-storage')).toBe('session');
    expect(localStorage.getItem('settings-storage')).toBe('prefs');
    expect(localStorage.getItem('template-storage')).toBe('my templates');
  });

  it('reloads so data is re-fetched fresh', () => {
    clearCachedData();
    expect(reload).toHaveBeenCalledOnce();
  });

  it('keeps the iCal subscriptions, which exist nowhere else, and drops the rest of the calendar state', () => {
    const subscription = { id: 's1', url: 'https://example.com/holidays.ics', calendarId: 'c9', name: 'Holidays', color: '#ff0000', refreshInterval: 60, lastRefreshed: null };
    localStorage.setItem('calendar-storage', JSON.stringify({
      state: { selectedCalendarIds: ['c1', 'c9'], viewMode: 'week', icalSubscriptions: [subscription] },
      version: 0,
    }));

    clearCachedData();

    expect(JSON.parse(localStorage.getItem('calendar-storage')!)).toEqual({ state: { icalSubscriptions: [subscription] }, version: 0 });
  });

  it('removes calendar state without subscriptions entirely', () => {
    localStorage.setItem('calendar-storage', JSON.stringify({ state: { viewMode: 'week', icalSubscriptions: [] }, version: 0 }));
    clearCachedData();
    expect(localStorage.getItem('calendar-storage')).toBeNull();
  });
});