import { describe, it, expect, vi, type Mock } from 'vitest';
import { LoginUseCase } from './LoginUseCase';
import type { IAuthRepository } from '../../domain/repositories/IAuthRepository';
import type { IPasswordHashingService } from '../../domain/services/PasswordHashingService';
import type { Logger } from '@core/shared/application';
import { Result } from '@core/shared/application/Result';
import { User } from '../../domain/entities/User';
import { UserId } from '../../domain/value-objects/UserId';
import { PasswordHash } from '../../domain/value-objects/PasswordHash';
import { EmailAddress } from '../../domain/value-objects/EmailAddress';

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

  beforeEach(() => {
    authRepo = {
      findByEmail: vi.fn(),
    };

    passwordService = {
      verify: vi.fn(),
    };

    logger = {
      debug: vi.fn(),
      info: vi.fn(),
      warn: vi.fn(),
      error: vi.fn(),
    } as unknown as Logger;

    useCase = new LoginUseCase(
      authRepo as unknown as IAuthRepository,
      passwordService as unknown as IPasswordHashingService,
      logger,
    );
  });

  it('successfully logs in with valid credentials', async () => {
    const user = User.create({
      id: UserId.create(),
      displayName: 'John Smith',
      email: 'test@example.com',
      passwordHash: PasswordHash.fromHash('hashed-password'),
    });
    authRepo.findByEmail.mockResolvedValue(user);
    passwordService.verify.mockResolvedValue(true);

    const result = await useCase.execute({
      email: 'test@example.com',
      password: 'Password123',
    });

    expect(result.isOk()).toBe(true);
    const loginResult = result.unwrap();
    expect(loginResult.user).toBe(user);
    expect(authRepo.findByEmail).toHaveBeenCalledTimes(1);
    expect(passwordService.verify).toHaveBeenCalledTimes(1);
  });

  it('returns error for invalid credentials', async () => {
    const user = User.create({
      id: UserId.create(),
      displayName: 'John Smith',
      email: 'test@example.com',
      passwordHash: PasswordHash.fromHash('hashed-password'),
    });
    authRepo.findByEmail.mockResolvedValue(user);
    passwordService.verify.mockResolvedValue(false);

    const result = await useCase.execute({
      email: 'test@example.com',
      password: 'WrongPassword',
    });

    expect(result.isErr()).toBe(true);
    expect(result.unwrapErr().code).toBe('INVALID_CREDENTIALS');
  });

  it('returns error when user does not exist', async () => {
    authRepo.findByEmail.mockResolvedValue(null);

    const result = await useCase.execute({
      email: 'nonexistent@example.com',
      password: 'Password123',
    });

    expect(result.isErr()).toBe(true);
    expect(result.unwrapErr().code).toBe('INVALID_CREDENTIALS');
  });
});