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

test.describe('Photo Grid', () => {
  // Use a known public subpage that has photos
  const GRID_URL = '/deutschland/kloster-chorin-2024';

  test('renders grid items with visible images', async ({ page }) => {
    await page.goto(GRID_URL);

    // Grid container should exist
    const grid = page.locator('.photo-grid');
    await expect(grid).toBeVisible();

    // Should have grid items
    const items = grid.locator('.photo-grid__item');
    const count = await items.count();
    expect(count).toBeGreaterThan(0);

    // Scroll to trigger IntersectionObserver (FadeIn)
    await items.first().scrollIntoViewIfNeeded();
    await page.waitForTimeout(1000);

    // First grid item should have real dimensions (not collapsed)
    const firstItem = items.first();
    const box = await firstItem.boundingBox();
    expect(box).not.toBeNull();
    expect(box!.width).toBeGreaterThan(100);
    expect(box!.height).toBeGreaterThan(50);

    // Image inside should exist and have the fill layout
    const img = firstItem.locator('img');
    await expect(img).toBeAttached();
  });

  test('grid items have overflow hidden (CSS regression)', async ({ page }) => {
    // This test guards against the CSS cascade bug where a later rule
    // strips `overflow: hidden` from .photo-grid__item, which breaks
    // next/image fill rendering.
    await page.goto(GRID_URL);

    const grid = page.locator('.photo-grid');
    await expect(grid).toBeVisible();

    const item = grid.locator('.photo-grid__item').first();
    await item.scrollIntoViewIfNeeded();

    const overflow = await item.evaluate((el) => getComputedStyle(el).overflow);
    expect(overflow).toBe('hidden');
  });

  test('images load with real content (not just blurhash)', async ({ page }) => {
    await page.goto(GRID_URL);

    // Scroll to trigger lazy loading
    const grid = page.locator('.photo-grid');
    await grid.scrollIntoViewIfNeeded();
    await page.waitForTimeout(3000);

    // Check that at least one image has loaded with real pixel data
    const imgLoaded = await page.evaluate(() => {
      const img = document.querySelector('.photo-grid__item img') as HTMLImageElement;
      if (!img) return { found: false };
      return {
        found: true,
        complete: img.complete,
        naturalWidth: img.naturalWidth,
        src: img.src.substring(0, 60),
      };
    });

    expect(imgLoaded.found).toBe(true);
    expect(imgLoaded.complete).toBe(true);
    expect(imgLoaded.naturalWidth).toBeGreaterThan(0);
  });
});