/**
 * Tests for localStorage utilities for chat lastReadAt persistence
 * Tests save, load, and clear operations with error handling
 */

describe('chatStorage', () => {
  let saveLastReadAt, loadLastReadAt, clearLastReadAt;

  beforeAll(() => {
    try {
      const storage = require('../chatStorage');
      saveLastReadAt = storage.saveLastReadAt;
      loadLastReadAt = storage.loadLastReadAt;
      clearLastReadAt = storage.clearLastReadAt;
    } catch (e) {
      // Module not yet created
    }
  });

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

  describe('saveLastReadAt', () => {
    test('should fail - function not implemented yet', () => {
      if (!saveLastReadAt) {
        expect(true).toBe(false); // RED phase
        return;
      }
      saveLastReadAt('session-abc', '2026-01-26T12:00:00Z');
      const stored = localStorage.getItem('jk_chat_lastReadAt');
      expect(stored).toBeTruthy();
      const parsed = JSON.parse(stored);
      expect(parsed['session-abc']).toBe('2026-01-26T12:00:00Z');
    });

    test('should fail - merge functionality not implemented yet', () => {
      if (!saveLastReadAt) {
        expect(true).toBe(false); // RED phase
        return;
      }
      saveLastReadAt('session-abc', '2026-01-26T12:00:00Z');
      saveLastReadAt('global', '2026-01-26T13:00:00Z');
      const stored = localStorage.getItem('jk_chat_lastReadAt');
      const parsed = JSON.parse(stored);
      expect(parsed['session-abc']).toBe('2026-01-26T12:00:00Z');
      expect(parsed['global']).toBe('2026-01-26T13:00:00Z');
    });

    test('should fail - error handling not implemented yet', () => {
      if (!saveLastReadAt) {
        expect(true).toBe(false); // RED phase
        return;
      }
      // Mock localStorage.setItem to throw error
      const originalSetItem = Storage.prototype.setItem;
      Storage.prototype.setItem = jest.fn(() => {
        throw new Error('QuotaExceededError');
      });

      expect(() => saveLastReadAt('session-abc', '2026-01-26T12:00:00Z')).not.toThrow();

      Storage.prototype.setItem = originalSetItem;
    });
  });

  describe('loadLastReadAt', () => {
    test('should fail - function not implemented yet', () => {
      if (!loadLastReadAt) {
        expect(true).toBe(false); // RED phase
        return;
      }
      localStorage.setItem('jk_chat_lastReadAt', JSON.stringify({
        'session-abc': '2026-01-26T12:00:00Z',
        'global': '2026-01-26T13:00:00Z'
      }));
      const data = loadLastReadAt();
      expect(data['session-abc']).toBe('2026-01-26T12:00:00Z');
      expect(data['global']).toBe('2026-01-26T13:00:00Z');
    });

    test('should fail - empty state not implemented yet', () => {
      if (!loadLastReadAt) {
        expect(true).toBe(false); // RED phase
        return;
      }
      const data = loadLastReadAt();
      expect(data).toEqual({});
    });

    test('should fail - parse error handling not implemented yet', () => {
      if (!loadLastReadAt) {
        expect(true).toBe(false); // RED phase
        return;
      }
      localStorage.setItem('jk_chat_lastReadAt', 'invalid json');
      const data = loadLastReadAt();
      expect(data).toEqual({});
    });
  });

  describe('clearLastReadAt', () => {
    test('should fail - function not implemented yet', () => {
      if (!clearLastReadAt) {
        expect(true).toBe(false); // RED phase
        return;
      }
      localStorage.setItem('jk_chat_lastReadAt', JSON.stringify({
        'session-abc': '2026-01-26T12:00:00Z',
        'global': '2026-01-26T13:00:00Z'
      }));
      clearLastReadAt('session-abc');
      const stored = localStorage.getItem('jk_chat_lastReadAt');
      const parsed = JSON.parse(stored);
      expect(parsed['session-abc']).toBeUndefined();
      expect(parsed['global']).toBe('2026-01-26T13:00:00Z');
    });

    test('should fail - clear all functionality not implemented yet', () => {
      if (!clearLastReadAt) {
        expect(true).toBe(false); // RED phase
        return;
      }
      localStorage.setItem('jk_chat_lastReadAt', JSON.stringify({
        'session-abc': '2026-01-26T12:00:00Z'
      }));
      clearLastReadAt();
      const stored = localStorage.getItem('jk_chat_lastReadAt');
      expect(stored).toBeNull();
    });
  });
});
