import { describe, it, expect, vi, type Mock } from 'vitest';
import { GetUserUseCase } from './GetUserUseCase';
import { User } from '../../domain/entities/User';
import type { IUserRepository, StoredUser } from '../../domain/repositories/IUserRepository';

describe('GetUserUseCase', () => {
  let userRepository: {
    findById: Mock;
  };

  let useCase: GetUserUseCase;

  beforeEach(() => {
    userRepository = {
      findById: vi.fn(),
    };

    useCase = new GetUserUseCase(userRepository as unknown as IUserRepository);
  });

  it('returns a User when the user exists', async () => {
    const storedUser: StoredUser = {
      id: 'user-1',
      email: 'test@example.com',
      displayName: 'Test User',
      passwordHash: 'hash',
      salt: 'salt',
      primaryDriverId: 'driver-1',
      createdAt: new Date(),
    };

    userRepository.findById.mockResolvedValue(storedUser);

    const result = await useCase.execute('user-1');

    expect(userRepository.findById).toHaveBeenCalledWith('user-1');
    expect(result).toBeInstanceOf(User);
    expect(result.getId().value).toBe('user-1');
    expect(result.getDisplayName()).toBe('Test User');
  });

  it('throws when the user does not exist', async () => {
    userRepository.findById.mockResolvedValue(null);

    await expect(useCase.execute('missing-user')).rejects.toThrow('User not found');
    expect(userRepository.findById).toHaveBeenCalledWith('missing-user');
  });
});