import { test, expect } from '@playwright/test';
import AxeBuilder from '@axe-core/playwright';

/**
 * 移动端可访问性专项测试
 *
 * 覆盖范围：
 * 1. axe-core 合规扫描（WCAG 2.1 AA）— 移动视口
 * 2. 触摸目标尺寸 ≥ 44px（WCAG 2.5.5）
 * 3. 焦点管理（移动端 Tab 导航）
 * 4. 表单标签关联
 * 5. 图片 Alt 文本
 * 6. 颜色对比度检查
 *
 * 标记：@mobile @accessibility
 */

test.setTimeout(60000);

// ==================== 1. axe-core 全量扫描 ====================
test.describe('移动端可访问性 - axe-core 合规扫描', { tag: '@mobile @accessibility' }, () => {
  const pages = [
    { path: '/', name: '首页' },
    { path: '/about', name: '关于我们' },
    { path: '/contact', name: '联系我们' },
    { path: '/products', name: '产品中心' },
    { path: '/solutions', name: '解决方案' },
    { path: '/services', name: '服务' },
    { path: '/news', name: '新闻' },
    { path: '/cases', name: '案例' },
    { path: '/team', name: '团队' },
  ];

  for (const { path, name } of pages) {
    test(`${name} (${path}) — WCAG 2.1 AA 无严重违规`, async ({ page }) => {
      await page.goto(path, { waitUntil: 'domcontentloaded', timeout: 30000 });
      await page.waitForTimeout(2000);

      const accessibilityScanResults = await new AxeBuilder({ page })
        .withTags(['wcag2a', 'wcag2aa', 'wcag21a', 'wcag21aa'])
        .analyze();

      const violations = accessibilityScanResults.violations;

      // 输出违规详情用于分析
      if (violations.length > 0) {
        console.log(`\n=== ${name} 可访问性违规 (${violations.length} 项) ===`);
        for (const v of violations) {
          console.log(`  [${v.impact}] ${v.id}: ${v.help}`);
          console.log(`    Nodes: ${v.nodes.length}, URL: ${v.helpUrl}`);
          // 输出前 2 个节点的摘要
          v.nodes.slice(0, 2).forEach((node, i) => {
            const target = node.target?.join(', ') || 'unknown';
            console.log(`    Node ${i + 1}: ${target.slice(0, 100)}`);
          });
        }
      }

      // 允许少量 low/moderate 违规，但 critical/serious 应为 0
      const criticalSerious = violations.filter(
        v => v.impact === 'critical' || v.impact === 'serious'
      );
      expect(criticalSerious.length).toBe(0);
    });
  }
});

// ==================== 2. 触摸目标尺寸检查 ====================
test.describe('移动端可访问性 - 触摸目标尺寸', { tag: '@mobile @accessibility' }, () => {
  test('首页交互元素触摸目标 ≥ 44px', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(1500);

    await page.evaluate(() => window.scrollTo(0, 0));
    await page.waitForTimeout(300);

    // 检查可见区域内的交互元素
    const smallTargets = await page.evaluate(() => {
      const interactiveElements = document.querySelectorAll(
        'a, button, input, select, textarea, [role="button"], [tabindex]:not([tabindex="-1"])'
      );
      const issues: Array<{ tag: string; text: string; width: number; height: number }> = [];

      interactiveElements.forEach(el => {
        const rect = el.getBoundingClientRect();
        // 只检查可见元素
        if (rect.width > 0 && rect.height > 0 && rect.width < 1000) {
          if (rect.width < 44 || rect.height < 44) {
            const text = el.textContent?.trim().slice(0, 30) || el.tagName;
            // 排除内联文本链接（段落中的 a 标签）
            const isInline = el.closest('p, span, li, h1, h2, h3, h4, h5, h6');
            if (!isInline) {
              issues.push({
                tag: el.tagName,
                text: text,
                width: Math.round(rect.width),
                height: Math.round(rect.height),
              });
            }
          }
        }
      });

      return issues;
    });

    if (smallTargets.length > 0) {
      console.log(`触摸目标不足 44px 的元素 (${smallTargets.length} 个):`);
      smallTargets.slice(0, 10).forEach(t => {
        console.log(`  <${t.tag}> "${t.text}" — ${t.width}x${t.height}px`);
      });
    }

    // 允许少量例外（如小图标装饰按钮），但不应超过 5 个
    expect(smallTargets.length).toBeLessThanOrEqual(5);
  });
});

// ==================== 3. 焦点管理 ====================
test.describe('移动端可访问性 - 焦点管理', { tag: '@mobile @accessibility' }, () => {
  test('焦点元素数量合理', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(1500);

    const focusableCount = await page.evaluate(() => {
      return document.querySelectorAll(
        'a, button, input, select, textarea, [tabindex]:not([tabindex="-1"])'
      ).length;
    });

    console.log(`Mobile focusable elements: ${focusableCount}`);
    expect(focusableCount).toBeGreaterThan(0);
  });
});

// ==================== 4. 表单标签关联 ====================
test.describe('移动端可访问性 - 表单标签', { tag: '@mobile @accessibility' }, () => {
  test('联系表单输入框有关联标签或 aria-label', async ({ page }) => {
    await page.goto('/contact', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(2500);

    const formInputs = await page.evaluate(() => {
      const inputs = document.querySelectorAll('input, textarea, select');
      const results: Array<{ tag: string; id: string; hasLabel: boolean; ariaLabel: string | null }> = [];

      inputs.forEach(input => {
        const id = input.id;
        const ariaLabel = input.getAttribute('aria-label');
        let hasLabel = false;
        if (id) {
          const label = document.querySelector(`label[for="${id}"]`);
          hasLabel = label !== null;
        }
        results.push({
          tag: input.tagName,
          id: id || '',
          hasLabel,
          ariaLabel,
        });
      });

      return results;
    });

    for (const input of formInputs) {
      const hasAccessibleName = input.hasLabel || input.ariaLabel;
      expect(
        hasAccessibleName,
        `Input ${input.tag}${input.id ? '#' + input.id : ''} 缺少可访问名称`
      ).toBeTruthy();
    }
  });
});

// ==================== 5. 图片 Alt 文本 ====================
test.describe('移动端可访问性 - 图片 Alt 文本', { tag: '@mobile @accessibility' }, () => {
  test('首页图片有 alt 属性', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(2000);

    const imagesWithoutAlt = await page.evaluate(() => {
      const images = Array.from(document.querySelectorAll('img'));
      return images.filter(img => !img.hasAttribute('alt') || img.getAttribute('alt') === null).length;
    });

    console.log(`Images without alt attribute: ${imagesWithoutAlt}`);
    expect(imagesWithoutAlt).toBe(0);
  });
});

// ==================== 6. 颜色对比度 ====================
test.describe('移动端可访问性 - 颜色对比度', { tag: '@mobile @accessibility' }, () => {
  test('无白色文字在白色背景上的问题', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(1500);

    const contrastIssues = await page.evaluate(() => {
      const issues: string[] = [];
      const textElements = document.querySelectorAll('p, h1, h2, h3, h4, h5, h6, span, a, li, td, th');

      textElements.forEach(el => {
        const style = window.getComputedStyle(el);
        const color = style.color;
        const bgColor = style.backgroundColor;

        if (color === 'rgb(255, 255, 255)' && bgColor === 'rgb(255, 255, 255)') {
          issues.push(`${el.tagName}: 白色文字在白色背景上`);
        }
      });

      return issues;
    });

    expect(contrastIssues.length, `发现颜色对比度问题:\n${contrastIssues.join('\n')}`).toBe(0);
  });
});