import { describe, it, expect, vi, type Mock } from 'vitest';
import { StartAuthUseCase } from './StartAuthUseCase';
import type { IdentityProviderPort } from '../ports/IdentityProviderPort';
import type { StartAuthCommandDTO } from '../dto/StartAuthCommandDTO';

describe('StartAuthUseCase', () => {
  let provider: {
    startAuth: Mock;
  };
  let useCase: StartAuthUseCase;

  beforeEach(() => {
    provider = {
      startAuth: vi.fn(),
    };

    useCase = new StartAuthUseCase(provider as unknown as IdentityProviderPort);
  });

  it('delegates to the identity provider to start auth', async () => {
    const command: StartAuthCommandDTO = {
      redirectUri: 'https://app/callback',
      provider: 'demo',
    };

    const expected = { redirectUrl: 'https://auth/redirect', state: 'state-123' };

    provider.startAuth.mockResolvedValue(expected);

    const result = await useCase.execute(command);

    expect(provider.startAuth).toHaveBeenCalledWith(command);
    expect(result).toEqual(expected);
  });
});