Accordion

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 Accordion from './Accordion.svelte';
import type { AccordionItem } from './Accordion.svelte';

// テスト用のアコーディオンデータ
const defaultItems: AccordionItem[] = [
  { id: 'section1', header: 'Section 1', content: 'Content 1' },
  { id: 'section2', header: 'Section 2', content: 'Content 2' },
  { id: 'section3', header: 'Section 3', content: 'Content 3' },
];

const itemsWithDisabled: AccordionItem[] = [
  { id: 'section1', header: 'Section 1', content: 'Content 1' },
  { id: 'section2', header: 'Section 2', content: 'Content 2', disabled: true },
  { id: 'section3', header: 'Section 3', content: 'Content 3' },
];

const itemsWithDefaultExpanded: AccordionItem[] = [
  { id: 'section1', header: 'Section 1', content: 'Content 1', defaultExpanded: true },
  { id: 'section2', header: 'Section 2', content: 'Content 2' },
  { id: 'section3', header: 'Section 3', content: 'Content 3' },
];

// 7個以上のアイテム（region role テスト用）
const manyItems: AccordionItem[] = Array.from({ length: 7 }, (_, i) => ({
  id: `section${i + 1}`,
  header: `Section ${i + 1}`,
  content: `Content ${i + 1}`,
}));

describe('Accordion (Svelte)', () => {
  // 🔴 High Priority: APG 準拠の核心
  describe('APG: キーボード操作', () => {
    it('Enter でパネルを開閉する', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button = screen.getByRole('button', { name: 'Section 1' });
      button.focus();

      expect(button).toHaveAttribute('aria-expanded', 'false');
      await user.keyboard('{Enter}');
      expect(button).toHaveAttribute('aria-expanded', 'true');
      await user.keyboard('{Enter}');
      expect(button).toHaveAttribute('aria-expanded', 'false');
    });

    it('Space でパネルを開閉する', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button = screen.getByRole('button', { name: 'Section 1' });
      button.focus();

      expect(button).toHaveAttribute('aria-expanded', 'false');
      await user.keyboard(' ');
      expect(button).toHaveAttribute('aria-expanded', 'true');
    });

    it('ArrowDown で次のヘッダーにフォーカス移動', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      button1.focus();

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

      const button2 = screen.getByRole('button', { name: 'Section 2' });
      expect(button2).toHaveFocus();
    });

    it('ArrowUp で前のヘッダーにフォーカス移動', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button2 = screen.getByRole('button', { name: 'Section 2' });
      button2.focus();

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

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      expect(button1).toHaveFocus();
    });

    it('ArrowDown で最後のヘッダーにいる場合、移動しない（ループなし）', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button3 = screen.getByRole('button', { name: 'Section 3' });
      button3.focus();

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

      expect(button3).toHaveFocus();
    });

    it('ArrowUp で最初のヘッダーにいる場合、移動しない（ループなし）', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      button1.focus();

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

      expect(button1).toHaveFocus();
    });

    it('Home で最初のヘッダーに移動', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button3 = screen.getByRole('button', { name: 'Section 3' });
      button3.focus();

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

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      expect(button1).toHaveFocus();
    });

    it('End で最後のヘッダーに移動', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      button1.focus();

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

      const button3 = screen.getByRole('button', { name: 'Section 3' });
      expect(button3).toHaveFocus();
    });

    it('disabled ヘッダーをスキップして移動', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: itemsWithDisabled } });

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      button1.focus();

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

      const button3 = screen.getByRole('button', { name: 'Section 3' });
      expect(button3).toHaveFocus();
    });

    it('enableArrowKeys=false で矢印キーナビゲーション無効', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems, enableArrowKeys: false } });

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      button1.focus();

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

      expect(button1).toHaveFocus();
    });
  });

  describe('APG: ARIA 属性', () => {
    it('ヘッダーボタンが aria-expanded を持つ', () => {
      render(Accordion, { props: { items: defaultItems } });
      const buttons = screen.getAllByRole('button');

      buttons.forEach((button) => {
        expect(button).toHaveAttribute('aria-expanded');
      });
    });

    it('開いたパネルで aria-expanded="true"', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button = screen.getByRole('button', { name: 'Section 1' });
      await user.click(button);

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

    it('閉じたパネルで aria-expanded="false"', () => {
      render(Accordion, { props: { items: defaultItems } });
      const button = screen.getByRole('button', { name: 'Section 1' });

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

    it('ヘッダーの aria-controls がパネル id と一致', () => {
      render(Accordion, { props: { items: defaultItems } });
      const button = screen.getByRole('button', { name: 'Section 1' });
      const ariaControls = button.getAttribute('aria-controls');

      expect(ariaControls).toBeTruthy();
      expect(document.getElementById(ariaControls!)).toBeInTheDocument();
    });

    it('6個以下のパネルで role="region" を持つ', () => {
      render(Accordion, { props: { items: defaultItems } });
      const regions = screen.getAllByRole('region');

      expect(regions).toHaveLength(3);
    });

    it('7個以上のパネルで role="region" を持たない', () => {
      render(Accordion, { props: { items: manyItems } });
      const regions = screen.queryAllByRole('region');

      expect(regions).toHaveLength(0);
    });

    it('パネルの aria-labelledby がヘッダー id と一致', () => {
      render(Accordion, { props: { items: defaultItems } });
      const button = screen.getByRole('button', { name: 'Section 1' });
      const regions = screen.getAllByRole('region');

      expect(regions[0]).toHaveAttribute('aria-labelledby', button.id);
    });

    it('disabled 項目が aria-disabled="true" を持つ', () => {
      render(Accordion, { props: { items: itemsWithDisabled } });
      const disabledButton = screen.getByRole('button', { name: 'Section 2' });

      expect(disabledButton).toHaveAttribute('aria-disabled', 'true');
    });
  });

  describe('APG: 見出し構造', () => {
    it('headingLevel=3 で h3 要素を使用', () => {
      render(Accordion, { props: { items: defaultItems, headingLevel: 3 } });
      const headings = document.querySelectorAll('h3');

      expect(headings).toHaveLength(3);
    });

    it('headingLevel=2 で h2 要素を使用', () => {
      render(Accordion, { props: { items: defaultItems, headingLevel: 2 } });
      const headings = document.querySelectorAll('h2');

      expect(headings).toHaveLength(3);
    });
  });

  // 🟡 Medium Priority: アクセシビリティ検証
  describe('アクセシビリティ', () => {
    it('axe による WCAG 2.1 AA 違反がない', async () => {
      const { container } = render(Accordion, { props: { items: defaultItems } });
      const results = await axe(container);
      expect(results).toHaveNoViolations();
    });
  });

  describe('Props', () => {
    it('defaultExpanded で初期展開状態を指定できる', () => {
      render(Accordion, { props: { items: itemsWithDefaultExpanded } });
      const button = screen.getByRole('button', { name: 'Section 1' });

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

    it('allowMultiple=false で1つのみ展開（デフォルト）', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems } });

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      const button2 = screen.getByRole('button', { name: 'Section 2' });

      await user.click(button1);
      expect(button1).toHaveAttribute('aria-expanded', 'true');

      await user.click(button2);
      expect(button1).toHaveAttribute('aria-expanded', 'false');
      expect(button2).toHaveAttribute('aria-expanded', 'true');
    });

    it('allowMultiple=true で複数展開可能', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: defaultItems, allowMultiple: true } });

      const button1 = screen.getByRole('button', { name: 'Section 1' });
      const button2 = screen.getByRole('button', { name: 'Section 2' });

      await user.click(button1);
      await user.click(button2);

      expect(button1).toHaveAttribute('aria-expanded', 'true');
      expect(button2).toHaveAttribute('aria-expanded', 'true');
    });

    it('onExpandedChange が展開状態変化時に呼び出される', async () => {
      const handleExpandedChange = vi.fn();
      const user = userEvent.setup();
      render(Accordion, {
        props: { items: defaultItems, onExpandedChange: handleExpandedChange },
      });

      await user.click(screen.getByRole('button', { name: 'Section 1' }));

      expect(handleExpandedChange).toHaveBeenCalledWith(['section1']);
    });
  });

  describe('異常系', () => {
    it('disabled 項目はクリックで開閉しない', async () => {
      const user = userEvent.setup();
      render(Accordion, { props: { items: itemsWithDisabled } });

      const disabledButton = screen.getByRole('button', { name: 'Section 2' });

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

    it('disabled かつ defaultExpanded の項目は展開されない', () => {
      const items: AccordionItem[] = [
        {
          id: 'section1',
          header: 'Section 1',
          content: 'Content 1',
          disabled: true,
          defaultExpanded: true,
        },
      ];
      render(Accordion, { props: { items } });

      const button = screen.getByRole('button', { name: 'Section 1' });
      expect(button).toHaveAttribute('aria-expanded', 'false');
    });
  });
});