import { ComponentFixture, TestBed } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
import { App } from './app';

describe('App studio flow', () => {
  let fixture: ComponentFixture<App>;

  beforeEach(async () => {
    vi.stubGlobal('crypto', { randomUUID: vi.fn(() => `image-${Math.random()}`) });
    vi.stubGlobal('fetch', vi.fn());
    vi.stubGlobal('URL', {
      createObjectURL: vi.fn((file: File) => `blob:${file.name}`),
      revokeObjectURL: vi.fn(),
    });

    await TestBed.configureTestingModule({
      imports: [App],
    }).compileComponents();

    fixture = TestBed.createComponent(App);
    fixture.detectChanges();
  });

  afterEach(() => {
    vi.unstubAllGlobals();
  });

  it('shows the empty starting state', () => {
    expect(text()).toContain('Maak een menu-afbeelding.');
    expect(fixture.nativeElement.querySelector('.primary').disabled).toBe(true);
    expect(fixture.nativeElement.querySelectorAll('.image-card')).toHaveLength(0);
  });

  it('loads multiple images from the picker without showing result cards yet', () => {
    selectFiles([
      new File(['one'], 'broodje.png', { type: 'image/png' }),
      new File(['two'], 'koffie.jpg', { type: 'image/jpeg' }),
      new File(['skip'], 'artikelen.csv', { type: 'text/csv' }),
    ]);

    expect(text()).not.toContain('artikelen.csv');
    expect(fixture.nativeElement.querySelectorAll('.image-card')).toHaveLength(0);
    expect(fixture.nativeElement.querySelector('.primary').disabled).toBe(false);
  });

  it('updates settings, generates variants and shows the generated result', async () => {
    mockCompletedGenerationJob('job-1', {
      images: [
        {
          originalName: 'cola.webp',
          variants: [
            {
              label: 'FLUX.2 Flex',
              imageBase64: 'data:image/png;base64,generated',
            },
          ],
        },
      ],
    });

    selectFiles([new File(['one'], 'cola.webp', { type: 'image/webp' })]);

    const selects = fixture.nativeElement.querySelectorAll('select') as NodeListOf<HTMLSelectElement>;
    selects[0].value = 'premium';
    selects[0].dispatchEvent(new Event('change'));
    selects[1].value = '9:16';
    selects[1].dispatchEvent(new Event('change'));

    const textarea = fixture.nativeElement.querySelector('textarea') as HTMLTextAreaElement;
    textarea.value = 'Maak een realistische koeling achtergrond';
    textarea.dispatchEvent(new Event('input'));
    fixture.detectChanges();

    click('.primary');
    expect(text()).toContain('Beelden maken...');

    await waitForGeneration();
    fixture.detectChanges();

    expect(text()).toContain('Maak nieuwe beelden');
    expect(text()).toContain('cola.webp');
    expect(text()).toContain('9:16');
    expect(text()).toContain('FLUX.2 Flex beeld is klaar voor controle.');
    expect(fixture.nativeElement.querySelector('.generated img').src).toBe('data:image/png;base64,generated');

    expect(fetch).toHaveBeenCalledWith('/api/generations', expect.objectContaining({ method: 'POST' }));
    expect(fetch).toHaveBeenCalledWith('/api/generations/job-1');
  });

  it('submits menu mode with multiple products', async () => {
    mockCompletedGenerationJob('job-menu', {
      images: [
        {
          originalName: 'burger.jpg',
          variants: [{ label: 'Menu deal', imageBase64: 'data:image/png;base64,menu' }],
        },
      ],
    });

    selectFiles([
      new File(['burger'], 'burger.jpg', { type: 'image/jpeg' }),
      new File(['cola'], 'cola-bottle.jpg', { type: 'image/jpeg' }),
      new File(['fries'], 'fries.jpg', { type: 'image/jpeg' }),
    ]);

    click('.primary');
    await waitForGeneration();
    fixture.detectChanges();

    const form = vi.mocked(fetch).mock.calls[0][1]?.body as FormData;
    expect(form.get('mode')).toBe('menu');
    expect(form.getAll('images')).toHaveLength(3);
    expect(text()).toContain('Menu deal beeld is klaar voor controle.');
  });

  it('shows an error when backend generation fails', async () => {
    vi.mocked(fetch).mockResolvedValue(new Response(undefined, { status: 502 }));
    selectFiles([new File(['one'], 'cola.webp', { type: 'image/webp' })]);

    click('.primary');
    await waitForGeneration();
    fixture.detectChanges();

    expect(text()).toContain('De beeldgenerator kon het verzoek niet verwerken:');
  });

  it('shows an error when an async job fails', async () => {
    vi.mocked(fetch).mockResolvedValueOnce(new Response(
      JSON.stringify({ jobId: 'job-failed', provider: 'kaggle', status: 'queued' }),
      { status: 202, headers: { 'Content-Type': 'application/json' } },
    ));
    vi.mocked(fetch).mockResolvedValueOnce(new Response(
      JSON.stringify({ jobId: 'job-failed', provider: 'kaggle', status: 'failed', error: 'Kaggle failed' }),
      { status: 200, headers: { 'Content-Type': 'application/json' } },
    ));
    selectFiles([new File(['one'], 'cola.webp', { type: 'image/webp' })]);

    click('.primary');
    await waitForGeneration();
    fixture.detectChanges();

    expect(text()).toContain('De beeldgenerator kon het verzoek niet verwerken: Kaggle failed');
  });

  it('keeps selected images hidden until a result is generated', () => {
    selectFiles([new File(['one'], 'pizza.png', { type: 'image/png' })]);

    expect(text()).not.toContain('pizza.png');
    expect(fixture.nativeElement.querySelectorAll('.image-card')).toHaveLength(0);
  });

  function mockCompletedGenerationJob(jobId: string, result: object): void {
    vi.mocked(fetch).mockResolvedValueOnce(new Response(
      JSON.stringify({ jobId, provider: 'kaggle', status: 'queued' }),
      { status: 202, headers: { 'Content-Type': 'application/json' } },
    ));
    vi.mocked(fetch).mockResolvedValueOnce(new Response(
      JSON.stringify({ jobId, provider: 'kaggle', status: 'completed', result }),
      { status: 200, headers: { 'Content-Type': 'application/json' } },
    ));
  }

  function selectFiles(files: File[]): void {
    const input = <HTMLInputElement>fixture.nativeElement.querySelector('input[type="file"]');
    Object.defineProperty(input, 'files', {
      configurable: true,
      value: files,
    });

    input.dispatchEvent(new Event('change'));
    fixture.detectChanges();
  }

  function click(selector: string): void {
    fixture.debugElement.query(By.css(selector)).nativeElement.click();
    fixture.detectChanges();
  }

  function text(): string {
    return fixture.nativeElement.textContent.replace(/\s+/g, ' ').trim();
  }

  async function waitForGeneration(): Promise<void> {
    await fixture.whenStable();
    await new Promise((resolve) => window.setTimeout(resolve));
    await fixture.whenStable();
  }
});