import { test, expect } from '@playwright/test';

/**
 * 移动端性能基线测试
 *
 * 目标：在 iPhone 14 视口（390x844）下测量关键性能指标，
 * 建立移动端性能基线，与桌面端对比发现性能差距。
 *
 * 测试指标：
 * 1. FCP (First Contentful Paint) < 2s
 * 2. LCP (Largest Contentful Paint) < 2.5s
 * 3. DOMContentLoaded < 3s
 * 4. 完整加载时间 < 8s
 * 5. 长任务计数
 * 6. 资源加载分析
 * 7. 关键页面加载时间对比
 *
 * 标记：@mobile @performance
 */

test.setTimeout(90000);

// ==================== 1. 核心性能指标 ====================
test.describe('移动端性能 - 核心加载指标', { tag: '@mobile @performance' }, () => {
  test('首页 FCP < 2s', async ({ page }) => {
    const fcp = await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 }).then(async () => {
      await page.waitForTimeout(1500);
      return page.evaluate(() => {
        const entries = performance.getEntriesByType('paint');
        const fcpEntry = entries.find(e => e.name === 'first-contentful-paint');
        return fcpEntry ? fcpEntry.startTime : null;
      });
    });

    if (fcp !== null) {
      console.log(`Mobile FCP: ${fcp.toFixed(0)}ms`);
      expect(fcp).toBeLessThan(2000);
    }
  });

  test('首页 LCP < 2.5s', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(2000);

    const lcp = await page.evaluate(() => {
      return new Promise<number | null>((resolve) => {
        const observer = new PerformanceObserver((list) => {
          const entries = list.getEntries();
          if (entries.length > 0) {
            const lastEntry = entries[entries.length - 1];
            resolve(lastEntry.startTime);
          }
        });
        observer.observe({ type: 'largest-contentful-paint', buffered: true });

        // 超时返回 null
        setTimeout(() => resolve(null), 5000);
      });
    });

    if (lcp !== null) {
      console.log(`Mobile LCP: ${lcp.toFixed(0)}ms`);
      expect(lcp).toBeLessThan(2500);
    }
  });

  test('首页 DOMContentLoaded < 3s', async ({ page }) => {
    const startTime = Date.now();
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    const loadTime = Date.now() - startTime;
    console.log(`Mobile DOMContentLoaded: ${loadTime}ms`);
    expect(loadTime).toBeLessThan(3000);
  });

  test('首页完整加载时间 < 8s', async ({ page }) => {
    const startTime = Date.now();
    await page.goto('/', { waitUntil: 'load', timeout: 30000 });
    await page.waitForTimeout(1000);
    const loadTime = Date.now() - startTime;
    console.log(`Mobile full load: ${loadTime}ms`);
    expect(loadTime).toBeLessThan(8000);
  });

  test('长任务计数 ≤ 3', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(2000);

    const longTaskCount = await page.evaluate(() => {
      return new Promise<number>((resolve) => {
        const observer = new PerformanceObserver((list) => {
          resolve(list.getEntries().length);
        });
        observer.observe({ entryTypes: ['longtask'] });
        setTimeout(() => resolve(0), 3000);
      });
    });

    console.log(`Mobile long task count: ${longTaskCount}`);
    expect(longTaskCount).toBeLessThanOrEqual(3);
  });
});

// ==================== 2. 关键页面加载对比 ====================
test.describe('移动端性能 - 关键页面加载对比', { tag: '@mobile @performance' }, () => {
  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' },
  ];

  for (const { path, name } of pages) {
    test(`${name} (${path}) 加载 < 5s`, async ({ page }) => {
      const startTime = Date.now();
      await page.goto(path, { waitUntil: 'domcontentloaded', timeout: 30000 });
      await page.waitForTimeout(1500);
      const loadTime = Date.now() - startTime;
      console.log(`Mobile ${name} load: ${loadTime}ms`);
      expect(loadTime).toBeLessThan(5000);
    });
  }
});

// ==================== 3. 资源加载分析 ====================
test.describe('移动端性能 - 资源加载分析', { tag: '@mobile @performance' }, () => {
  test('图片资源大小合理', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(2000);

    const imageAnalysis = await page.evaluate(() => {
      const images = Array.from(document.querySelectorAll('img'));
      let largeImages = 0;
      let oversizedCount = 0;

      images.forEach(img => {
        if (img.naturalWidth > 1920) {
          largeImages++;
        }
        // 检查移动端是否加载了远大于视口的图片
        if (img.naturalWidth > 800 && img.naturalWidth > 0) {
          oversizedCount++;
        }
      });

      return {
        totalImages: images.length,
        largeImageCount: largeImages,
        oversizedForMobile: oversizedCount,
      };
    });

    console.log('Mobile image analysis:', imageAnalysis);
    expect(imageAnalysis.totalImages).toBeGreaterThan(0);
  });

  test('JS/CSS 资源加载时间合理', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });

    const resourceTiming = await page.evaluate(() => {
      const entries = performance.getEntriesByType('resource') as PerformanceResourceTiming[];
      return entries
        .filter(e => e.initiatorType === 'script' || e.initiatorType === 'stylesheet')
        .map(e => ({
          name: e.name.split('/').pop(),
          type: e.initiatorType,
          duration: Math.round(e.duration),
          transferSize: e.transferSize,
        }));
    });

    console.log('Mobile resource timing:', resourceTiming.slice(0, 10));

    const criticalResources = resourceTiming.filter(r =>
      r.name?.includes('main') ||
      r.name?.includes('chunk') ||
      r.name?.includes('app')
    );

    for (const resource of criticalResources) {
      expect(resource.duration).toBeLessThan(3000);
    }
  });
});

// ==================== 4. 移动端渲染性能 ====================
test.describe('移动端性能 - 渲染性能', { tag: '@mobile @performance' }, () => {
  test('页面无水平滚动条', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(1500);

    const hasHorizontalScroll = await page.evaluate(() => {
      return document.documentElement.scrollWidth > document.documentElement.clientWidth;
    });

    expect(hasHorizontalScroll).toBeFalsy();
  });

  test('滚动流畅无卡顿', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(1500);

    // 模拟快速滚动
    for (let i = 0; i < 5; i++) {
      await page.evaluate(() => window.scrollBy(0, window.innerHeight));
      await page.waitForTimeout(200);
    }

    // 滚动后页面不应崩溃
    const bodyVisible = await page.locator('body').isVisible();
    expect(bodyVisible).toBeTruthy();
  });

  test('触摸目标尺寸 ≥ 44px（WCAG 2.1 AA）', async ({ page }) => {
    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
    await page.waitForTimeout(1500);

    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();
        // 只检查可见且非零尺寸的元素
        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（如段落中的 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('Small touch targets found:', smallTargets.slice(0, 10));
    }
    // 允许少量例外（如小图标按钮），但不应超过 5 个
    expect(smallTargets.length).toBeLessThanOrEqual(5);
  });
});