import { ApplicationRef, PLATFORM_ID } from '@angular/core';
import { TestBed, type ComponentFixture } from '@angular/core/testing';
import { provideRouter, Router, TitleStrategy } from '@angular/router';
import { App, WIDE_NAV_QUERY } from './app';
import { routes } from './app.routes';
import { SITE_CONTENT } from './core/content/content.token';
import { SITE_CONTENT_DATA } from './core/content/site-content';
import { SeoTitleStrategy } from './core/seo/seo-title.strategy';

function mockViewport(wide: boolean): void {
  Object.defineProperty(window, 'matchMedia', {
    configurable: true,
    writable: true,
    value: (query: string): MediaQueryList =>
      ({
        matches: wide && query === WIDE_NAV_QUERY,
        media: query,
        onchange: null,
        addListener: vi.fn(),
        removeListener: vi.fn(),
        addEventListener: vi.fn(),
        removeEventListener: vi.fn(),
        dispatchEvent: vi.fn(),
      }) as MediaQueryList,
  });
}

async function configureApp(
  extraProviders: { provide: unknown; useValue: unknown }[] = [],
): Promise<void> {
  await TestBed.configureTestingModule({
    imports: [App],
    providers: [
      provideRouter(routes),
      { provide: SITE_CONTENT, useValue: SITE_CONTENT_DATA },
      { provide: TitleStrategy, useClass: SeoTitleStrategy },
      ...extraProviders,
    ],
  }).compileComponents();
}

async function flush(fixture: ComponentFixture<App>): Promise<void> {
  fixture.detectChanges();
  await fixture.whenStable();
  TestBed.inject(ApplicationRef).tick();
  fixture.detectChanges();
  await fixture.whenStable();
}

function toggle(root: HTMLElement): HTMLButtonElement {
  return root.querySelector('.nav-toggle') as HTMLButtonElement;
}

describe('App', () => {
  beforeEach(async () => {
    vi.spyOn(HTMLCanvasElement.prototype, 'getContext').mockReturnValue(null);
    mockViewport(true);

    await configureApp();
  });

  afterEach(() => {
    vi.restoreAllMocks();
    Reflect.deleteProperty(window, 'matchMedia');
  });

  it('should create the shell', async () => {
    const fixture = TestBed.createComponent(App);
    await fixture.whenStable();
    expect(fixture.componentInstance).toBeTruthy();
  });

  it('should render an accessible application shell', async () => {
    const fixture = TestBed.createComponent(App);
    await fixture.whenStable();
    const compiled = fixture.nativeElement as HTMLElement;

    const focusable = compiled.querySelectorAll(
      'a[href], button:not([disabled]), [tabindex]:not([tabindex="-1"])',
    );
    const firstFocusable = focusable.item(0);

    expect(firstFocusable).toBeTruthy();
    expect(firstFocusable.getAttribute('href')).toBe('#main-content');
    expect(firstFocusable.classList.contains('skip-link')).toBe(true);
    expect(compiled.querySelector('main#main-content')).toBeTruthy();
    expect(compiled.querySelector('nav[aria-label]')).toBeTruthy();
    expect(compiled.querySelector('a.language-switch[hreflang]')).toBeTruthy();
    expect(compiled.querySelector('footer')).toBeTruthy();
  });

  it('renders the terminal dock outside .site and keeps the header free of a CV link', async () => {
    const fixture = TestBed.createComponent(App);
    await fixture.whenStable();
    const compiled = fixture.nativeElement as HTMLElement;
    const site = compiled.querySelector('.site');
    const dock = compiled.querySelector('app-terminal-dock');
    const trigger = compiled.querySelector('.terminal-dock-trigger');

    expect(site).toBeTruthy();
    expect(dock).toBeTruthy();
    expect(site?.contains(dock)).toBe(false);
    expect(compiled.querySelector('header a[href="/cv/CV.pdf"]')).toBeNull();
    expect(compiled.querySelector('header .command-palette-trigger')).toBeNull();

    const panel = compiled.querySelector('.terminal-dock-panel');
    expect(panel).toBeTruthy();
    expect((trigger as HTMLButtonElement).hasAttribute('hidden')).toBe(true);
    expect(site?.contains(panel)).toBe(false);
    expect(site?.hasAttribute('inert')).toBe(false);
  });

  it('keeps the server-rendered nav expanded and collapses after hydration on a narrow viewport', async () => {
    TestBed.resetTestingModule();
    vi.spyOn(HTMLCanvasElement.prototype, 'getContext').mockReturnValue(null);
    mockViewport(false);
    await configureApp();

    const fixture = TestBed.createComponent(App);
    const shell = fixture.componentInstance as unknown as { navOpen: () => boolean };
    expect(shell.navOpen()).toBe(true);

    await flush(fixture);
    const button = toggle(fixture.nativeElement);
    expect(button.getAttribute('aria-expanded')).toBe('false');
    expect(button.getAttribute('aria-controls')).toBe('primary-nav');
    expect(button.getAttribute('aria-label')).toBeTruthy();
    expect(fixture.nativeElement.querySelector('.site')?.classList.contains('nav-collapsed')).toBe(
      true,
    );
  });

  it('does not collapse the nav on the server even when the viewport helper would be narrow', async () => {
    TestBed.resetTestingModule();
    vi.spyOn(HTMLCanvasElement.prototype, 'getContext').mockReturnValue(null);
    mockViewport(false);
    await configureApp([{ provide: PLATFORM_ID, useValue: 'server' }]);

    const fixture = TestBed.createComponent(App);
    await flush(fixture);

    expect(toggle(fixture.nativeElement).getAttribute('aria-expanded')).toBe('true');
    expect(fixture.nativeElement.querySelector('.site')?.classList.contains('nav-collapsed')).toBe(
      false,
    );
  });

  it('closes the nav on navigation when the viewport is narrow', async () => {
    TestBed.resetTestingModule();
    vi.spyOn(HTMLCanvasElement.prototype, 'getContext').mockReturnValue(null);
    mockViewport(false);
    await configureApp();

    const fixture = TestBed.createComponent(App);
    await flush(fixture);

    const button = toggle(fixture.nativeElement);
    expect(button.getAttribute('aria-expanded')).toBe('false');
    button.click();
    fixture.detectChanges();
    expect(button.getAttribute('aria-expanded')).toBe('true');

    await TestBed.inject(Router).navigateByUrl('/projekte');
    await flush(fixture);

    expect(toggle(fixture.nativeElement).getAttribute('aria-expanded')).toBe('false');
  });
});