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

describe('SignupUseCase', () => {
  let authRepo: {
    findByEmail: Mock;
    save: Mock;
  };
  let passwordService: {
    hash: Mock;
  };
  let logger: Logger;
  let useCase: SignupUseCase;

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

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

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

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

  it('successfully signs up a new user', async () => {
    authRepo.findByEmail.mockResolvedValue(null);
    passwordService.hash.mockResolvedValue('hashed-password');

    const result = await useCase.execute({
      email: 'test@example.com',
      password: 'Password123',
      displayName: 'John Smith', // Valid name that passes validation
    });

    expect(result.isOk()).toBe(true);
    const signupResult = result.unwrap();
    expect(signupResult.user).toBeDefined();
    expect(signupResult.user.getEmail()).toBe('test@example.com');
    expect(signupResult.user.getDisplayName()).toBe('John Smith');
    expect(authRepo.findByEmail).toHaveBeenCalledTimes(1);
    expect(authRepo.save).toHaveBeenCalledTimes(1);
  });

  it('returns error when user already exists', async () => {
    const existingUser = User.create({
      id: UserId.create(),
      displayName: 'John Smith',
      email: 'test@example.com',
      passwordHash: PasswordHash.fromHash('existing-hash'),
    });
    authRepo.findByEmail.mockResolvedValue(existingUser);

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

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

  it('returns error for weak password', async () => {
    const result = await useCase.execute({
      email: 'test@example.com',
      password: 'weak',
      displayName: 'John Smith',
    });

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

  it('returns error for invalid display name', async () => {
    const result = await useCase.execute({
      email: 'test@example.com',
      password: 'Password123',
      displayName: 'A', // Too short
    });

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