import { describe, it, expect, vi, type Mock } from 'vitest';
import { LoginUseCase } from './LoginUseCase';
import { EmailAddress } from '../../domain/value-objects/EmailAddress';
import type { IAuthRepository } from '../../domain/repositories/IAuthRepository';
import type { IPasswordHashingService } from '../../domain/services/PasswordHashingService';
import { User } from '../../domain/entities/User';

describe('LoginUseCase', () => {
  let authRepo: {
    findByEmail: Mock;
  };
  let passwordService: {
    verify: Mock;
  };
  let useCase: LoginUseCase;

  beforeEach(() => {
    authRepo = {
      findByEmail: vi.fn(),
    };
    passwordService = {
      verify: vi.fn(),
    };
    useCase = new LoginUseCase(
      authRepo as unknown as IAuthRepository,
      passwordService as unknown as IPasswordHashingService,
    );
  });

  it('returns the user when credentials are valid', async () => {
    const email = 'test@example.com';
    const password = 'password123';
    const emailVO = EmailAddress.create(email);

    const user = User.create({
      id: { value: 'user-1' } as any,
      displayName: 'Test User',
      email: emailVO.value,
    });

    (user as any).getPasswordHash = () => ({ value: 'stored-hash' });

    authRepo.findByEmail.mockResolvedValue(user);
    passwordService.verify.mockResolvedValue(true);

    const result = await useCase.execute(email, password);

    expect(authRepo.findByEmail).toHaveBeenCalledWith(emailVO);
    expect(passwordService.verify).toHaveBeenCalledWith(password, 'stored-hash');
    expect(result).toBe(user);
  });

  it('throws when user is not found', async () => {
    const email = 'missing@example.com';

    authRepo.findByEmail.mockResolvedValue(null);

    await expect(useCase.execute(email, 'password')).rejects.toThrow('Invalid credentials');
  });

  it('throws when password is invalid', async () => {
    const email = 'test@example.com';
    const password = 'wrong-password';
    const emailVO = EmailAddress.create(email);

    const user = User.create({
      id: { value: 'user-1' } as any,
      displayName: 'Test User',
      email: emailVO.value,
    });

    (user as any).getPasswordHash = () => ({ value: 'stored-hash' });

    authRepo.findByEmail.mockResolvedValue(user);
    passwordService.verify.mockResolvedValue(false);

    await expect(useCase.execute(email, password)).rejects.toThrow('Invalid credentials');
    expect(authRepo.findByEmail).toHaveBeenCalled();
    expect(passwordService.verify).toHaveBeenCalled();
  });
});