import { TestBed } from '@angular/core/testing';
import { provideRouter, Router } from '@angular/router';
import { provideHttpClient } from '@angular/common/http';
import { provideHttpClientTesting } from '@angular/common/http/testing';
import { UploadComponent } from './upload.component';
import { routes } from '../app.routes';

describe('UploadComponent', () => {
  let component: UploadComponent;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      imports: [UploadComponent],
      providers: [provideHttpClient(), provideHttpClientTesting(), provideRouter(routes)],
    }).compileComponents();
  });

  it('should normalise tag input: lowercases and splits on comma/space', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    component.tagInput = 'CAT, Funny reaction';
    expect(component.parseTagInput(component.tagInput)).toEqual(['cat', 'funny', 'reaction']);
  });

  it('should split on commas', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    expect(fixture.componentInstance.parseTagInput('a,b,c')).toEqual(['a', 'b', 'c']);
  });

  it('should filter empty tokens', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    expect(fixture.componentInstance.parseTagInput('  ,, cat ,,')).toEqual(['cat']);
  });

  it('on duplicate response: shows toast and navigates to detail', async () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    const router = TestBed.inject(Router);
    spyOn(router, 'navigate');
    await component.handleUploadResponse({ id: 'abc', duplicate: true } as Parameters<typeof component.handleUploadResponse>[0]);
    expect(component.toastMessage).toContain('library');
    expect(router.navigate).toHaveBeenCalledWith(['/images', 'abc']);
  });

  it('on success response: shows success toast and navigates to detail', async () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    const router = TestBed.inject(Router);
    spyOn(router, 'navigate');
    await component.handleUploadResponse({ id: 'xyz', duplicate: false } as Parameters<typeof component.handleUploadResponse>[0]);
    expect(component.toastMessage).toBeTruthy();
    expect(router.navigate).toHaveBeenCalledWith(['/images', 'xyz']);
  });

  it('on error response: shows inline error, no navigation', async () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    const router = TestBed.inject(Router);
    spyOn(router, 'navigate');
    component.handleUploadError({ status: 422, error: { detail: 'bad file', code: 'invalid_mime_type' } });
    expect(component.errorMessage).toBeTruthy();
    expect(router.navigate).not.toHaveBeenCalled();
  });

  // New polish tests

  it('submit button is disabled when no file is selected', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
    const btn = (fixture.nativeElement as HTMLElement).querySelector('button[type="submit"]') as HTMLButtonElement;
    expect(btn.disabled).toBeTrue();
  });

  it('submit button shows "Uploading…" label while uploading is true', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    component.uploading = true;
    fixture.detectChanges();
    const btn = (fixture.nativeElement as HTMLElement).querySelector('button[type="submit"]') as HTMLButtonElement;
    expect(btn.textContent).toContain('Uploading');
    expect(btn.disabled).toBeTrue();
  });

  it('showSuccess banner is hidden initially', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
    expect((fixture.nativeElement as HTMLElement).querySelector('.success-banner')).toBeNull();
  });

  it('showSuccess banner is visible when showSuccess is true', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    component.showSuccess = true;
    component.uploadedFilename = 'photo.jpg';
    fixture.detectChanges();
    const banner = (fixture.nativeElement as HTMLElement).querySelector('.success-banner');
    expect(banner).not.toBeNull();
    expect(banner!.textContent).toContain('photo.jpg');
  });

  it('shows validation error message for 422 response', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
    component.handleUploadError({ status: 422, error: { detail: 'Unsupported file type', code: 'invalid_mime_type' } });
    fixture.detectChanges();
    const err = (fixture.nativeElement as HTMLElement).querySelector('.error');
    expect(err!.textContent).toContain('Unsupported file type');
  });

  it('shows generic error message for network error', () => {
    const fixture = TestBed.createComponent(UploadComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
    component.handleUploadError({ status: 500, error: null });
    fixture.detectChanges();
    const err = (fixture.nativeElement as HTMLElement).querySelector('.error');
    expect(err!.textContent).toBeTruthy();
  });
});