Combobox

import { render, screen } from '@testing-library/svelte';
import userEvent from '@testing-library/user-event';
import { axe } from 'jest-axe';
import { describe, expect, it, vi } from 'vitest';
import Combobox from './Combobox.svelte';

// Default test options
const defaultOptions = [
  { id: 'apple', label: 'Apple' },
  { id: 'banana', label: 'Banana' },
  { id: 'cherry', label: 'Cherry' },
];

// Options with disabled item
const optionsWithDisabled = [
  { id: 'apple', label: 'Apple' },
  { id: 'banana', label: 'Banana', disabled: true },
  { id: 'cherry', label: 'Cherry' },
];

// Options with first item disabled
const optionsWithFirstDisabled = [
  { id: 'apple', label: 'Apple', disabled: true },
  { id: 'banana', label: 'Banana' },
  { id: 'cherry', label: 'Cherry' },
];

// Options with last item disabled
const optionsWithLastDisabled = [
  { id: 'apple', label: 'Apple' },
  { id: 'banana', label: 'Banana' },
  { id: 'cherry', label: 'Cherry', disabled: true },
];

// All disabled options
const allDisabledOptions = [
  { id: 'apple', label: 'Apple', disabled: true },
  { id: 'banana', label: 'Banana', disabled: true },
  { id: 'cherry', label: 'Cherry', disabled: true },
];

describe('Combobox (Svelte)', () => {
  // 🔴 High Priority: APG ARIA Attributes
  describe('APG: ARIA Attributes', () => {
    it('input has role="combobox"', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });
      expect(screen.getByRole('combobox')).toBeInTheDocument();
    });

    it('has accessible name via aria-labelledby', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Select a fruit' },
      });
      const input = screen.getByRole('combobox');
      expect(input).toHaveAccessibleName('Select a fruit');
    });

    it('has aria-controls pointing to listbox', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });
      const input = screen.getByRole('combobox');
      const listboxId = input.getAttribute('aria-controls');

      expect(listboxId).toBeTruthy();
      expect(document.getElementById(listboxId!)).toHaveAttribute('role', 'listbox');
    });

    it('aria-controls points to existing listbox even when closed', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });
      const input = screen.getByRole('combobox');
      const listboxId = input.getAttribute('aria-controls');

      expect(listboxId).toBeTruthy();
      const listbox = document.getElementById(listboxId!);
      expect(listbox).toBeInTheDocument();
      expect(listbox).toHaveAttribute('hidden');
    });

    it('has aria-expanded="false" when closed', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });
      expect(screen.getByRole('combobox')).toHaveAttribute('aria-expanded', 'false');
    });

    it('has aria-expanded="true" when opened', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      expect(input).toHaveAttribute('aria-expanded', 'true');
    });

    it('has aria-autocomplete="list"', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });
      expect(screen.getByRole('combobox')).toHaveAttribute('aria-autocomplete', 'list');
    });

    it('has aria-autocomplete="none" when autocomplete is none', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', autocomplete: 'none' },
      });
      expect(screen.getByRole('combobox')).toHaveAttribute('aria-autocomplete', 'none');
    });

    it('has aria-activedescendant when option focused', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      expect(input).toHaveAttribute('aria-activedescendant');
      const activeId = input.getAttribute('aria-activedescendant');
      expect(activeId).toBeTruthy();
      expect(document.getElementById(activeId!)).toHaveTextContent('Apple');
    });

    it('clears aria-activedescendant when closed', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(input.getAttribute('aria-activedescendant')).toBeTruthy();

      await user.keyboard('{Escape}');
      expect(input.getAttribute('aria-activedescendant')).toBeFalsy();
    });

    it('listbox has role="listbox"', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      expect(screen.getByRole('listbox')).toBeInTheDocument();
    });

    it('options have role="option"', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const options = screen.getAllByRole('option');
      expect(options).toHaveLength(3);
    });

    it('focused option has aria-selected="true"', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const firstOption = screen.getByRole('option', { name: 'Apple' });
      expect(firstOption).toHaveAttribute('aria-selected', 'true');
    });

    it('disabled option has aria-disabled="true"', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: optionsWithDisabled, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const disabledOption = screen.getByRole('option', { name: 'Banana' });
      expect(disabledOption).toHaveAttribute('aria-disabled', 'true');
    });
  });

  // 🔴 High Priority: APG Keyboard Interaction (Input)
  describe('APG: Keyboard Interaction (Input)', () => {
    it('opens popup and focuses first enabled option on ArrowDown', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      expect(input).toHaveAttribute('aria-expanded', 'true');
      const activeId = input.getAttribute('aria-activedescendant');
      expect(document.getElementById(activeId!)).toHaveTextContent('Apple');
    });

    it('opens popup and focuses last enabled option on ArrowUp', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowUp}');

      expect(input).toHaveAttribute('aria-expanded', 'true');
      const activeId = input.getAttribute('aria-activedescendant');
      expect(document.getElementById(activeId!)).toHaveTextContent('Cherry');
    });

    it('skips disabled first option on ArrowDown', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: optionsWithFirstDisabled, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const activeId = input.getAttribute('aria-activedescendant');
      expect(document.getElementById(activeId!)).toHaveTextContent('Banana');
    });

    it('skips disabled last option on ArrowUp', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: optionsWithLastDisabled, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowUp}');

      const activeId = input.getAttribute('aria-activedescendant');
      expect(document.getElementById(activeId!)).toHaveTextContent('Banana');
    });

    it('closes popup on Escape', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(input).toHaveAttribute('aria-expanded', 'true');

      await user.keyboard('{Escape}');
      expect(input).toHaveAttribute('aria-expanded', 'false');
    });

    it('selects option and closes popup on Enter', async () => {
      const user = userEvent.setup();
      const onSelect = vi.fn();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', onSelect },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{Enter}');

      expect(onSelect).toHaveBeenCalledWith(defaultOptions[0]);
      expect(input).toHaveAttribute('aria-expanded', 'false');
      expect(input).toHaveValue('Apple');
    });

    it('closes popup on Tab', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(input).toHaveAttribute('aria-expanded', 'true');

      await user.keyboard('{Tab}');
      expect(input).toHaveAttribute('aria-expanded', 'false');
    });

    it('opens popup on typing', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.type(input, 'a');

      expect(input).toHaveAttribute('aria-expanded', 'true');
    });

    it('Alt+ArrowDown opens without changing focus position', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{Alt>}{ArrowDown}{/Alt}');

      expect(input).toHaveAttribute('aria-expanded', 'true');
      expect(input.getAttribute('aria-activedescendant')).toBeFalsy();
    });

    it('Alt+ArrowUp commits selection and closes', async () => {
      const user = userEvent.setup();
      const onSelect = vi.fn();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', onSelect },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{Alt>}{ArrowUp}{/Alt}');

      expect(onSelect).toHaveBeenCalledWith(defaultOptions[1]);
      expect(input).toHaveAttribute('aria-expanded', 'false');
    });
  });

  // 🔴 High Priority: APG Keyboard Interaction (Listbox Navigation)
  describe('APG: Keyboard Interaction (Listbox)', () => {
    it('moves to next enabled option on ArrowDown', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Apple');

      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Banana');
    });

    it('moves to previous enabled option on ArrowUp', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Banana');

      await user.keyboard('{ArrowUp}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Apple');
    });

    it('skips disabled option on ArrowDown', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: optionsWithDisabled, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Apple');

      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Cherry');
    });

    it('skips disabled option on ArrowUp', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: optionsWithDisabled, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowUp}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Cherry');

      await user.keyboard('{ArrowUp}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Apple');
    });

    it('moves to first enabled option on Home', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: optionsWithFirstDisabled, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowUp}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Cherry');

      await user.keyboard('{Home}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Banana');
    });

    it('moves to last enabled option on End', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: optionsWithLastDisabled, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Apple');

      await user.keyboard('{End}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Banana');
    });

    it('does not wrap on ArrowDown at last option', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Cherry');

      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Cherry');
    });

    it('does not wrap on ArrowUp at first option', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Apple');

      await user.keyboard('{ArrowUp}');
      expect(
        document.getElementById(input.getAttribute('aria-activedescendant')!)
      ).toHaveTextContent('Apple');
    });
  });

  // 🔴 High Priority: Focus Management
  describe('APG: Focus Management', () => {
    it('keeps DOM focus on input when navigating', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{ArrowDown}');

      expect(input).toHaveFocus();
    });

    it('updates aria-activedescendant on navigation', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const firstActiveId = input.getAttribute('aria-activedescendant');
      expect(firstActiveId).toBeTruthy();

      await user.keyboard('{ArrowDown}');

      const secondActiveId = input.getAttribute('aria-activedescendant');
      expect(secondActiveId).toBeTruthy();
      expect(secondActiveId).not.toBe(firstActiveId);
    });

    it('maintains focus on input after selection', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{Enter}');

      expect(input).toHaveFocus();
    });
  });

  // 🔴 High Priority: Autocomplete
  describe('Autocomplete', () => {
    it('filters options based on input', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.type(input, 'app');

      const options = screen.getAllByRole('option');
      expect(options).toHaveLength(1);
      expect(options[0]).toHaveTextContent('Apple');
    });

    it('shows all options when input is empty', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const options = screen.getAllByRole('option');
      expect(options).toHaveLength(3);
    });

    it('updates input value on selection', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{Enter}');

      expect(input).toHaveValue('Banana');
    });

    it('does not filter when autocomplete="none"', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', autocomplete: 'none' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.type(input, 'xyz');

      const options = screen.getAllByRole('option');
      expect(options).toHaveLength(3);
    });
  });

  // 🔴 High Priority: Disabled Options
  describe('Disabled Options', () => {
    it('does not select disabled option on Enter', async () => {
      const user = userEvent.setup();
      const onSelect = vi.fn();
      render(Combobox, {
        props: { options: optionsWithFirstDisabled, label: 'Fruit', onSelect },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{ArrowUp}');
      await user.keyboard('{Enter}');

      expect(onSelect).toHaveBeenCalledWith(optionsWithFirstDisabled[1]);
    });

    it('does not select disabled option on click', async () => {
      const user = userEvent.setup();
      const onSelect = vi.fn();
      render(Combobox, {
        props: { options: optionsWithDisabled, label: 'Fruit', onSelect },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const disabledOption = screen.getByRole('option', { name: 'Banana' });
      await user.click(disabledOption);

      expect(onSelect).not.toHaveBeenCalled();
      expect(input).toHaveAttribute('aria-expanded', 'true');
    });
  });

  // 🔴 High Priority: Mouse Interaction
  describe('Mouse Interaction', () => {
    it('selects option on click', async () => {
      const user = userEvent.setup();
      const onSelect = vi.fn();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', onSelect },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const option = screen.getByRole('option', { name: 'Banana' });
      await user.click(option);

      expect(onSelect).toHaveBeenCalledWith(defaultOptions[1]);
      expect(input).toHaveValue('Banana');
    });

    it('closes popup on option click', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(input).toHaveAttribute('aria-expanded', 'true');

      const option = screen.getByRole('option', { name: 'Banana' });
      await user.click(option);

      expect(input).toHaveAttribute('aria-expanded', 'false');
    });

    it('closes popup on outside click', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(input).toHaveAttribute('aria-expanded', 'true');

      await user.click(document.body);
      expect(input).toHaveAttribute('aria-expanded', 'false');
    });

    it('updates aria-selected on hover', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const bananaOption = screen.getByRole('option', { name: 'Banana' });
      await user.hover(bananaOption);

      expect(bananaOption).toHaveAttribute('aria-selected', 'true');
      expect(screen.getByRole('option', { name: 'Apple' })).toHaveAttribute(
        'aria-selected',
        'false'
      );
    });
  });

  // 🟡 Medium Priority: Accessibility Validation
  describe('Accessibility', () => {
    it('has no axe violations when closed', async () => {
      const { container } = render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });
      const results = await axe(container);
      expect(results).toHaveNoViolations();
    });

    it('has no axe violations when open', async () => {
      const user = userEvent.setup();
      const { container } = render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      const results = await axe(container);
      expect(results).toHaveNoViolations();
    });

    it('has no axe violations with selection', async () => {
      const user = userEvent.setup();
      const { container } = render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{Enter}');

      const results = await axe(container);
      expect(results).toHaveNoViolations();
    });
  });

  // 🟢 Low Priority: Props & Behavior
  describe('Props & Behavior', () => {
    it('calls onSelect when option selected', async () => {
      const user = userEvent.setup();
      const onSelect = vi.fn();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', onSelect },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      await user.keyboard('{Enter}');

      expect(onSelect).toHaveBeenCalledWith(defaultOptions[0]);
      expect(onSelect).toHaveBeenCalledTimes(1);
    });

    it('calls onInputChange when typing', async () => {
      const user = userEvent.setup();
      const onInputChange = vi.fn();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', onInputChange },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.type(input, 'app');

      expect(onInputChange).toHaveBeenCalledWith('a');
      expect(onInputChange).toHaveBeenCalledWith('ap');
      expect(onInputChange).toHaveBeenCalledWith('app');
    });

    it('calls onOpenChange when popup toggles', async () => {
      const user = userEvent.setup();
      const onOpenChange = vi.fn();
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', onOpenChange },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');
      expect(onOpenChange).toHaveBeenCalledWith(true);

      await user.keyboard('{Escape}');
      expect(onOpenChange).toHaveBeenCalledWith(false);
    });

    it('applies className to container', () => {
      const { container } = render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', class: 'custom-class' },
      });

      expect(container.querySelector('.apg-combobox')).toHaveClass('custom-class');
    });

    it('supports disabled state on combobox', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', disabled: true },
      });

      const input = screen.getByRole('combobox');
      expect(input).toBeDisabled();
    });

    it('supports placeholder', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', placeholder: 'Choose a fruit...' },
      });

      const input = screen.getByRole('combobox');
      expect(input).toHaveAttribute('placeholder', 'Choose a fruit...');
    });

    it('supports defaultInputValue', () => {
      render(Combobox, {
        props: { options: defaultOptions, label: 'Fruit', defaultInputValue: 'Ban' },
      });

      const input = screen.getByRole('combobox');
      expect(input).toHaveValue('Ban');
    });
  });

  // Edge Cases
  describe('Edge Cases', () => {
    it('handles empty options array', () => {
      expect(() => {
        render(Combobox, {
          props: { options: [], label: 'Fruit' },
        });
      }).not.toThrow();

      expect(screen.getByRole('combobox')).toBeInTheDocument();
    });

    it('when all options are disabled, popup opens but no focus set', async () => {
      const user = userEvent.setup();
      render(Combobox, {
        props: { options: allDisabledOptions, label: 'Fruit' },
      });

      const input = screen.getByRole('combobox');
      await user.click(input);
      await user.keyboard('{ArrowDown}');

      expect(input).toHaveAttribute('aria-expanded', 'true');
      expect(input.getAttribute('aria-activedescendant')).toBeFalsy();
    });
  });
});