/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import { describe, it, expect, vi, beforeEach } from 'vitest';
import { performInitialAuth } from './auth.js';
import {
  type Config,
  ValidationRequiredError,
  AuthType,
} from '@google/gemini-cli-core';

vi.mock('@google/gemini-cli-core', async (importOriginal) => {
  const actual =
    await importOriginal<typeof import('@google/gemini-cli-core')>();
  return {
    ...actual,
    getErrorMessage: (e: unknown) => (e as Error).message,
  };
});

describe('auth', () => {
  let mockConfig: Config;

  beforeEach(() => {
    mockConfig = {
      refreshAuth: vi.fn(),
    } as unknown as Config;
  });

  it('should return null if authType is undefined', async () => {
    const result = await performInitialAuth(mockConfig, undefined);
    expect(result).toBeNull();
    expect(mockConfig.refreshAuth).not.toHaveBeenCalled();
  });

  it('should return null on successful auth', async () => {
    const result = await performInitialAuth(
      mockConfig,
      AuthType.LOGIN_WITH_GOOGLE,
    );
    expect(result).toBeNull();
    expect(mockConfig.refreshAuth).toHaveBeenCalledWith(
      AuthType.LOGIN_WITH_GOOGLE,
    );
  });

  it('should return error message on failed auth', async () => {
    const error = new Error('Auth failed');
    vi.mocked(mockConfig.refreshAuth).mockRejectedValue(error);
    const result = await performInitialAuth(
      mockConfig,
      AuthType.LOGIN_WITH_GOOGLE,
    );
    expect(result).toBe('Failed to login. Message: Auth failed');
    expect(mockConfig.refreshAuth).toHaveBeenCalledWith(
      AuthType.LOGIN_WITH_GOOGLE,
    );
  });

  it('should return null if refreshAuth throws ValidationRequiredError', async () => {
    vi.mocked(mockConfig.refreshAuth).mockRejectedValue(
      new ValidationRequiredError('Validation required'),
    );
    const result = await performInitialAuth(
      mockConfig,
      AuthType.LOGIN_WITH_GOOGLE,
    );
    expect(result).toBeNull();
    expect(mockConfig.refreshAuth).toHaveBeenCalledWith(
      AuthType.LOGIN_WITH_GOOGLE,
    );
  });
});