import { DOCUMENT } from '@angular/common';
import { ApplicationRef, PLATFORM_ID } from '@angular/core';
import { ComponentFixture, TestBed } from '@angular/core/testing';
import { provideRouter, Router } from '@angular/router';
import { SIGNATURE_COPY } from '../../core/content/signature-copy';
import { SITE_CONFIG } from '../../core/content/site-config';
import { APP_LOCALES, type AppLocale } from '../../core/i18n/locale';
import { LocaleService } from '../../core/i18n/locale.service';
import { NavigationService } from '../../core/navigation/navigation.service';
import { TerminalDock } from './terminal-dock';
import { TerminalDockService } from './terminal-dock.service';

describe('TerminalDock', () => {
  afterEach(() => {
    document.body.style.overflow = '';
    vi.restoreAllMocks();
  });

  async function createFixture(
    locale: AppLocale = 'de',
    extraProviders: { provide: unknown; useValue: unknown }[] = [],
  ): Promise<ComponentFixture<TerminalDock>> {
    TestBed.resetTestingModule();
    await TestBed.configureTestingModule({
      imports: [TerminalDock],
      providers: [provideRouter([]), ...extraProviders],
    }).compileComponents();

    TestBed.inject(LocaleService).setLocale(locale);
    const fixture = TestBed.createComponent(TerminalDock);
    fixture.detectChanges();
    await fixture.whenStable();
    return fixture;
  }

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

  function trigger(fixture: ComponentFixture<TerminalDock>): HTMLButtonElement {
    return fixture.nativeElement.querySelector('.terminal-dock-trigger');
  }

  function panel(fixture: ComponentFixture<TerminalDock>): HTMLElement | null {
    return fixture.nativeElement.querySelector('.terminal-dock-panel');
  }

  function input(fixture: ComponentFixture<TerminalDock>): HTMLInputElement | null {
    return fixture.nativeElement.querySelector('input');
  }

  async function openViaTrigger(fixture: ComponentFixture<TerminalDock>): Promise<void> {
    trigger(fixture).click();
    await flush(fixture);
  }

  async function submitQuery(
    fixture: ComponentFixture<TerminalDock>,
    value: string,
  ): Promise<void> {
    const field = input(fixture);
    expect(field).toBeTruthy();
    field!.value = value;
    field!.dispatchEvent(new Event('input', { bubbles: true }));
    fixture.nativeElement
      .querySelector('form')
      ?.dispatchEvent(new Event('submit', { bubbles: true, cancelable: true }));
    await flush(fixture);
  }

  function logText(fixture: ComponentFixture<TerminalDock>): string {
    return fixture.nativeElement.querySelector('.terminal-dock-log')?.textContent ?? '';
  }

  it.each(APP_LOCALES)('renders the collapsed trigger on the server (%s)', async (locale) => {
    const fixture = await createFixture(locale, [{ provide: PLATFORM_ID, useValue: 'server' }]);
    expect(trigger(fixture)).toBeTruthy();
    expect(panel(fixture)).toBeNull();
  });

  it.each(APP_LOCALES)('opens from the trigger and focuses the input (%s)', async (locale) => {
    const fixture = await createFixture(locale);
    await openViaTrigger(fixture);
    expect(panel(fixture)).toBeTruthy();
    expect(document.activeElement).toBe(input(fixture));
    expect(fixture.nativeElement.querySelector('[role="dialog"]')).toBeNull();
    expect(fixture.nativeElement.querySelector('.command-palette-scrim')).toBeNull();
  });

  it.each(APP_LOCALES)('toggles the trigger open, closed, then open again (%s)', async (locale) => {
    const fixture = await createFixture(locale);
    const dock = TestBed.inject(TerminalDockService);

    await openViaTrigger(fixture);
    expect(panel(fixture)).toBeTruthy();
    expect(dock.state()).toBe('expanded');
    expect(document.activeElement).toBe(input(fixture));

    trigger(fixture).click();
    await flush(fixture);
    expect(panel(fixture)).toBeNull();
    expect(dock.state()).toBe('collapsed');
    expect(document.activeElement).toBe(trigger(fixture));

    await openViaTrigger(fixture);
    expect(panel(fixture)).toBeTruthy();
    expect(dock.state()).toBe('expanded');
    expect(document.activeElement).toBe(input(fixture));
  });

  it.each(APP_LOCALES)(
    'returns focus to the trigger after a trigger-initiated collapse (%s)',
    async (locale) => {
      const fixture = await createFixture(locale);
      await openViaTrigger(fixture);
      expect(document.activeElement).toBe(input(fixture));

      trigger(fixture).click();
      await flush(fixture);

      expect(panel(fixture)).toBeNull();
      expect(document.activeElement).toBe(trigger(fixture));
    },
  );

  it.each(APP_LOCALES)('moves through collapsed, expanded and maximized (%s)', async (locale) => {
    const fixture = await createFixture(locale);
    const dock = TestBed.inject(TerminalDockService);
    expect(dock.state()).toBe('collapsed');

    await openViaTrigger(fixture);
    expect(dock.state()).toBe('expanded');

    fixture.nativeElement.querySelector('[aria-pressed]')?.click();
    await flush(fixture);
    expect(dock.state()).toBe('maximized');
    expect(
      fixture.nativeElement.querySelector('[aria-pressed]')?.getAttribute('aria-pressed'),
    ).toBe('true');

    fixture.nativeElement.querySelector('[aria-pressed]')?.click();
    await flush(fixture);
    expect(dock.state()).toBe('expanded');
  });

  it.each(APP_LOCALES)(
    'keeps one stable maximize name across both aria-pressed states (%s)',
    async (locale) => {
      const fixture = await createFixture(locale);
      await openViaTrigger(fixture);
      const label = SIGNATURE_COPY[locale].terminal.maximizeLabel;
      const button = fixture.nativeElement.querySelector('[aria-pressed]') as HTMLButtonElement;

      expect(button.getAttribute('aria-label')).toBe(label);
      expect(button.textContent?.trim()).toBe(label);
      expect(button.getAttribute('aria-pressed')).toBe('false');

      button.click();
      await flush(fixture);

      expect(button.getAttribute('aria-label')).toBe(label);
      expect(button.textContent?.trim()).toBe(label);
      expect(button.getAttribute('aria-pressed')).toBe('true');
    },
  );

  it.each(APP_LOCALES)('opens from Ctrl+K and Meta+K (%s)', async (locale) => {
    const fixture = await createFixture(locale);
    await flush(fixture);

    for (const modifier of [{ ctrlKey: true }, { metaKey: true }] as const) {
      if (panel(fixture)) {
        input(fixture)?.dispatchEvent(
          new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }),
        );
        await flush(fixture);
      }

      const event = new KeyboardEvent('keydown', {
        key: 'k',
        bubbles: true,
        cancelable: true,
        ...modifier,
      });
      const prevent = vi.spyOn(event, 'preventDefault');
      document.dispatchEvent(event);
      await flush(fixture);

      expect(prevent).toHaveBeenCalled();
      expect(panel(fixture)).toBeTruthy();
    }
  });

  it('does not toggle or preventDefault on Ctrl/Cmd+Shift+K', async () => {
    const fixture = await createFixture();
    await flush(fixture);

    for (const modifier of [
      { ctrlKey: true, shiftKey: true },
      { metaKey: true, shiftKey: true },
    ] as const) {
      const event = new KeyboardEvent('keydown', {
        key: 'k',
        bubbles: true,
        cancelable: true,
        ...modifier,
      });
      const prevent = vi.spyOn(event, 'preventDefault');
      document.dispatchEvent(event);
      await flush(fixture);

      expect(prevent).not.toHaveBeenCalled();
      expect(panel(fixture)).toBeNull();
    }

    const openEvent = new KeyboardEvent('keydown', {
      key: 'k',
      bubbles: true,
      cancelable: true,
      ctrlKey: true,
    });
    const preventOpen = vi.spyOn(openEvent, 'preventDefault');
    document.dispatchEvent(openEvent);
    await flush(fixture);
    expect(preventOpen).toHaveBeenCalled();
    expect(panel(fixture)).toBeTruthy();

    const shiftWhileOpen = new KeyboardEvent('keydown', {
      key: 'k',
      bubbles: true,
      cancelable: true,
      ctrlKey: true,
      shiftKey: true,
    });
    const preventShift = vi.spyOn(shiftWhileOpen, 'preventDefault');
    document.dispatchEvent(shiftWhileOpen);
    await flush(fixture);
    expect(preventShift).not.toHaveBeenCalled();
    expect(panel(fixture)).toBeTruthy();

    const metaOpen = new KeyboardEvent('keydown', {
      key: 'k',
      bubbles: true,
      cancelable: true,
      metaKey: true,
    });
    const preventMeta = vi.spyOn(metaOpen, 'preventDefault');
    document.dispatchEvent(metaOpen);
    await flush(fixture);
    expect(preventMeta).toHaveBeenCalled();
    expect(panel(fixture)).toBeNull();
  });

  it.each(APP_LOCALES)('closes on Escape and returns focus to the trigger (%s)', async (locale) => {
    const fixture = await createFixture(locale);
    await openViaTrigger(fixture);
    input(fixture)?.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }));
    await flush(fixture);

    expect(panel(fixture)).toBeNull();
    expect(document.activeElement).toBe(trigger(fixture));
  });

  it.each(APP_LOCALES)(
    'closes on Escape from a panel control and returns focus to the trigger (%s)',
    async (locale) => {
      const fixture = await createFixture(locale);
      await openViaTrigger(fixture);

      const maximize = fixture.nativeElement.querySelector('[aria-pressed]') as HTMLButtonElement;
      maximize.focus();
      expect(document.activeElement).toBe(maximize);

      maximize.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }));
      await flush(fixture);

      expect(panel(fixture)).toBeNull();
      expect(document.activeElement).toBe(trigger(fixture));
    },
  );

  it.each(APP_LOCALES)('does not lock scroll or mark the page inert (%s)', async (locale) => {
    document.body.style.overflow = 'auto';
    const fixture = await createFixture(locale);
    await openViaTrigger(fixture);

    expect(document.body.style.overflow).toBe('auto');
    expect(document.querySelector('.site')?.hasAttribute('inert')).toBeFalsy();
    expect(fixture.nativeElement.querySelector('[aria-modal]')).toBeNull();
    document.body.style.overflow = '';
  });

  it.each(APP_LOCALES)(
    'echoes the prompt, keeps the log and walks command history (%s)',
    async (locale) => {
      const fixture = await createFixture(locale);
      await openViaTrigger(fixture);
      const copy = SIGNATURE_COPY[locale].terminal;

      await submitQuery(fixture, 'help');
      const helpText = logText(fixture);
      expect(helpText).toContain(`${copy.prompt} help`);
      expect(helpText).toContain(copy.helpIntro);
      expect(helpText).toContain(copy.helpGrammar);

      await submitQuery(fixture, 'brew');
      expect(logText(fixture)).toContain(copy.responses.brew);
      expect(logText(fixture)).toContain(`${copy.prompt} help`);

      await submitQuery(fixture, 'rev');
      expect(logText(fixture)).toContain(copy.responses.rev);

      await submitQuery(fixture, 'history');
      expect(logText(fixture)).toContain(copy.historyIntro);
      expect(logText(fixture)).toContain('help');

      const field = input(fixture);
      field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowUp', bubbles: true }));
      await flush(fixture);
      expect(field?.value).toBe('history');

      await submitQuery(fixture, 'clear');
      expect(logText(fixture).trim()).toBe(copy.clearedMessage);
    },
  );

  it.each(APP_LOCALES)('scrolls the log to the newest line after output (%s)', async (locale) => {
    const fixture = await createFixture(locale);
    await openViaTrigger(fixture);
    const logEl = fixture.nativeElement.querySelector('.terminal-dock-log') as HTMLElement;
    const scrollTo = vi.fn();
    Object.defineProperty(logEl, 'scrollHeight', { configurable: true, get: () => 480 });
    Object.defineProperty(logEl, 'scrollTo', { configurable: true, value: scrollTo });

    await submitQuery(fixture, 'help');

    expect(scrollTo).toHaveBeenCalled();
    expect(scrollTo.mock.calls.at(-1)?.[0]).toEqual(
      expect.objectContaining({
        top: 480,
      }),
    );
  });

  it.each(APP_LOCALES)('walks command history like a conventional shell (%s)', async (locale) => {
    const fixture = await createFixture(locale);
    await openViaTrigger(fixture);
    await submitQuery(fixture, 'help');
    await submitQuery(fixture, 'brew');
    await submitQuery(fixture, 'rev');

    const field = input(fixture);
    expect(field?.value).toBe('');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowDown', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowUp', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('rev');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowUp', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('brew');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowUp', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('help');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowUp', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('help');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowDown', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('brew');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowDown', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('rev');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowDown', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('');

    field?.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowDown', bubbles: true }));
    await flush(fixture);
    expect(field?.value).toBe('');
  });

  it.each(APP_LOCALES)('navigates a known target and opens the CV asset (%s)', async (locale) => {
    const fixture = await createFixture(locale);
    const router = TestBed.inject(Router);
    const navigation = TestBed.inject(NavigationService);
    const navigate = vi.spyOn(router, 'navigate').mockResolvedValue(true);
    const view = TestBed.inject(DOCUMENT).defaultView;
    const open = vi.spyOn(view as Window, 'open').mockReturnValue(null);

    await openViaTrigger(fixture);
    await submitQuery(fixture, 'navigate pitch');
    expect(navigate).toHaveBeenCalledWith(navigation.link('pitch'));

    await submitQuery(fixture, 'navigate cv');
    expect(open).toHaveBeenCalledWith(SITE_CONFIG.cvAssetPath, '_blank', 'noopener,noreferrer');
  });

  it('registers no document listener on the server', async () => {
    const add = vi.spyOn(document, 'addEventListener');
    await createFixture('de', [{ provide: PLATFORM_ID, useValue: 'server' }]);
    expect(add.mock.calls.some((call) => call[0] === 'keydown')).toBe(false);
  });

  it('removes the document keydown listener on destroy', async () => {
    const add = vi.spyOn(document, 'addEventListener');
    const fixture = await createFixture();
    await flush(fixture);

    const added = add.mock.calls.find((call) => call[0] === 'keydown');
    expect(added).toBeTruthy();

    const remove = vi.spyOn(document, 'removeEventListener');
    fixture.destroy();
    TestBed.resetTestingModule();

    expect(remove).toHaveBeenCalledWith('keydown', added?.[1]);
  });
});