Genarrative/src/mobileViewportKeyboardFocus.test.ts

/* @vitest-environment jsdom */

import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';

import {
  isEditableKeyboardTarget,
  resolveMobileKeyboardExposedFill,
  resolveMobileKeyboardState,
  stabilizeMobileViewportKeyboardFocus,
} from './mobileViewportKeyboardFocus';

const originalMatchMedia = window.matchMedia;
const originalRequestAnimationFrame = window.requestAnimationFrame;
const originalCancelAnimationFrame = window.cancelAnimationFrame;
const originalInnerHeight = window.innerHeight;
const originalMaxTouchPoints = navigator.maxTouchPoints;
const originalVisualViewport = window.visualViewport;

function defineWindowValue<Key extends keyof Window>(
  key: Key,
  value: Window[Key],
) {
  Object.defineProperty(window, key, {
    configurable: true,
    value,
  });
}

function defineNavigatorValue<Key extends keyof Navigator>(
  key: Key,
  value: Navigator[Key],
) {
  Object.defineProperty(navigator, key, {
    configurable: true,
    value,
  });
}

beforeEach(() => {
  document.body.innerHTML = '';
  document.documentElement.removeAttribute('data-mobile-keyboard-open');
  document.documentElement.removeAttribute(
    'data-mobile-viewport-keyboard-focus',
  );
  document.documentElement.removeAttribute('style');
});

afterEach(() => {
  vi.useRealTimers();
  document.body.innerHTML = '';
  document.documentElement.removeAttribute('data-mobile-keyboard-open');
  document.documentElement.removeAttribute(
    'data-mobile-viewport-keyboard-focus',
  );
  document.documentElement.removeAttribute('style');
  defineWindowValue('matchMedia', originalMatchMedia);
  defineWindowValue('requestAnimationFrame', originalRequestAnimationFrame);
  defineWindowValue('cancelAnimationFrame', originalCancelAnimationFrame);
  defineWindowValue('innerHeight', originalInnerHeight);
  defineNavigatorValue('maxTouchPoints', originalMaxTouchPoints);
  defineWindowValue('visualViewport', originalVisualViewport);
});

describe('isEditableKeyboardTarget', () => {
  it('matches controls that open the mobile keyboard', () => {
    const input = document.createElement('input');
    input.type = 'text';
    const textarea = document.createElement('textarea');
    const buttonInput = document.createElement('input');
    buttonInput.type = 'file';

    expect(isEditableKeyboardTarget(input)).toBe(true);
    expect(isEditableKeyboardTarget(textarea)).toBe(true);
    expect(isEditableKeyboardTarget(buttonInput)).toBe(false);
  });

  it('ignores disabled and readonly controls', () => {
    const disabledInput = document.createElement('input');
    disabledInput.disabled = true;
    const readonlyInput = document.createElement('input');
    readonlyInput.readOnly = true;

    expect(isEditableKeyboardTarget(disabledInput)).toBe(false);
    expect(isEditableKeyboardTarget(readonlyInput)).toBe(false);
  });
});

describe('resolveMobileKeyboardExposedFill', () => {
  it('uses the active platform shell fill for exposed mini-program keyboard space', () => {
    document.body.innerHTML = `
      <div
        class="platform-viewport-shell"
        style="--platform-body-fill: linear-gradient(180deg, rgb(255, 253, 249), rgb(248, 239, 231));"
      ></div>
    `;

    expect(resolveMobileKeyboardExposedFill()).toContain('rgb(255, 253, 249)');
  });

  it('falls back to the light platform fill before the shell mounts', () => {
    document.body.innerHTML = '';

    expect(resolveMobileKeyboardExposedFill()).toContain('#fffdf9');
  });
});

describe('resolveMobileKeyboardState', () => {
  it('detects the keyboard inset without asking the app shell to shift', () => {
    expect(
      resolveMobileKeyboardState({
        layoutHeight: 800,
        visualTop: 0,
        visualHeight: 500,
        hasEditableTarget: true,
      }),
    ).toEqual({
      isOpen: true,
      insetBottom: 300,
    });
  });

  it('stays closed when no editable target is focused', () => {
    expect(
      resolveMobileKeyboardState({
        layoutHeight: 800,
        visualTop: 0,
        visualHeight: 500,
        hasEditableTarget: false,
      }),
    ).toEqual({
      isOpen: false,
      insetBottom: 0,
    });
  });

  it('accounts for browser visual viewport panning without returning a shell offset', () => {
    expect(
      resolveMobileKeyboardState({
        layoutHeight: 800,
        visualTop: 120,
        visualHeight: 500,
        hasEditableTarget: true,
      }),
    ).toEqual({
      isOpen: true,
      insetBottom: 180,
    });
  });
});

describe('stabilizeMobileViewportKeyboardFocus', () => {
  it('marks H5 keyboard state without applying a global shell transform offset', () => {
    vi.useFakeTimers();
    document.body.innerHTML = `
      <div
        class="platform-viewport-shell"
        style="--platform-body-fill: linear-gradient(180deg, rgb(255, 253, 249), rgb(248, 239, 231));"
      >
        <input id="theme-input" />
      </div>
    `;
    defineNavigatorValue('maxTouchPoints', 1);
    defineWindowValue(
      'matchMedia',
      vi
        .fn()
        .mockReturnValue({ matches: true }) as unknown as Window['matchMedia'],
    );
    defineWindowValue('requestAnimationFrame', ((
      callback: FrameRequestCallback,
    ) => {
      callback(0);
      return 1;
    }) as Window['requestAnimationFrame']);
    defineWindowValue(
      'cancelAnimationFrame',
      vi.fn() as unknown as Window['cancelAnimationFrame'],
    );
    defineWindowValue('innerHeight', 800);
    defineWindowValue('visualViewport', {
      height: 500,
      offsetTop: 120,
      addEventListener: vi.fn(),
      removeEventListener: vi.fn(),
    } as unknown as VisualViewport);

    stabilizeMobileViewportKeyboardFocus();

    document.getElementById('theme-input')?.focus();
    document.dispatchEvent(new FocusEvent('focusin', { bubbles: true }));
    vi.runAllTimers();

    expect(document.documentElement.dataset.mobileKeyboardOpen).toBe('true');
    expect(
      document.documentElement.style.getPropertyValue(
        '--platform-keyboard-focus-offset',
      ),
    ).toBe('0px');
    expect(
      document.documentElement.style.getPropertyValue(
        '--platform-keyboard-inset-bottom',
      ),
    ).toBe('180px');
    expect(
      document.documentElement.style.getPropertyValue(
        '--platform-keyboard-exposed-fill',
      ),
    ).toContain('rgb(255, 253, 249)');
  });
});