import { describe, it, expect, vi, type Mock } from 'vitest';
import { SignupWithEmailUseCase, type SignupCommandDTO } from './SignupWithEmailUseCase';
import type { IUserRepository, StoredUser } from '../../domain/repositories/IUserRepository';
import type { IdentitySessionPort } from '../ports/IdentitySessionPort';
import type { AuthSessionDTO } from '../dto/AuthSessionDTO';

describe('SignupWithEmailUseCase', () => {
  let userRepository: {
    findByEmail: Mock;
    create: Mock;
  };
  let sessionPort: {
    createSession: Mock;
    getCurrentSession: Mock;
    clearSession: Mock;
  };
  let useCase: SignupWithEmailUseCase;

  beforeEach(() => {
    userRepository = {
      findByEmail: vi.fn(),
      create: vi.fn(),
    };
    sessionPort = {
      createSession: vi.fn(),
      getCurrentSession: vi.fn(),
      clearSession: vi.fn(),
    };
    useCase = new SignupWithEmailUseCase(
      userRepository as unknown as IUserRepository,
      sessionPort as unknown as IdentitySessionPort,
    );
  });

  it('creates a new user and session for valid input', async () => {
    const command: SignupCommandDTO = {
      email: 'new@example.com',
      password: 'password123',
      displayName: 'New User',
    };

    userRepository.findByEmail.mockResolvedValue(null);

    const session: AuthSessionDTO = {
      user: {
        id: 'user-1',
        email: command.email.toLowerCase(),
        displayName: command.displayName,
      },
      issuedAt: Date.now(),
      expiresAt: Date.now() + 1000,
      token: 'session-token',
    };

    sessionPort.createSession.mockResolvedValue(session);

    const result = await useCase.execute(command);

    expect(userRepository.findByEmail).toHaveBeenCalledWith(command.email);
    expect(userRepository.create).toHaveBeenCalled();
    expect(sessionPort.createSession).toHaveBeenCalledWith({
      id: expect.any(String),
      email: command.email.toLowerCase(),
      displayName: command.displayName,
    });

    expect(result.session).toEqual(session);
    expect(result.isNewUser).toBe(true);
  });

  it('throws when email format is invalid', async () => {
    const command: SignupCommandDTO = {
      email: 'invalid-email',
      password: 'password123',
      displayName: 'User',
    };

    await expect(useCase.execute(command)).rejects.toThrow('Invalid email format');
  });

  it('throws when password is too short', async () => {
    const command: SignupCommandDTO = {
      email: 'valid@example.com',
      password: 'short',
      displayName: 'User',
    };

    await expect(useCase.execute(command)).rejects.toThrow('Password must be at least 8 characters');
  });

  it('throws when display name is too short', async () => {
    const command: SignupCommandDTO = {
      email: 'valid@example.com',
      password: 'password123',
      displayName: ' ',
    };

    await expect(useCase.execute(command)).rejects.toThrow('Display name must be at least 2 characters');
  });

  it('throws when email already exists', async () => {
    const command: SignupCommandDTO = {
      email: 'existing@example.com',
      password: 'password123',
      displayName: 'Existing User',
    };

    const existingUser: StoredUser = {
      id: 'user-1',
      email: command.email,
      displayName: command.displayName,
      passwordHash: 'hash',
      salt: 'salt',
      createdAt: new Date(),
    };

    userRepository.findByEmail.mockResolvedValue(existingUser);

    await expect(useCase.execute(command)).rejects.toThrow('An account with this email already exists');
  });
});