import { existsSync, readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { expect, test, type Page, type TestInfo } from '@playwright/test';

const stylesheetFiles = [
  'src/styles/tokens.css',
  'src/styles/base.css',
  'src/styles/layout.css',
  'src/styles/components.css',
  'src/styles/print.css',
];

function informationLayerCss(): string {
  return stylesheetFiles
    .map((file) => {
      const path = resolve(process.cwd(), file);
      return existsSync(path) ? readFileSync(path, 'utf8') : '';
    })
    .join('\n');
}

function informationLayerHarness(): string {
  const navigation = ['Start', 'Profile', 'Experience', 'Infrastructure', 'Selected builds', 'Contact'];
  const sections = ['start', 'profile', 'experience', 'infrastructure', 'selected-builds', 'contact'];

  return `<!doctype html>
    <html lang="en">
    <head>
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <style>${informationLayerCss()}</style>
    </head>
    <body>
    <a class="skip-link" href="#portfolio-content">Skip to portfolio content</a>
    <div class="portfolio-shell">
      <header class="site-header">
        <p class="route-label">00 / INTRODUCTION</p>
        <h1>Luca Pîslaru</h1>
        <p class="role">System Administrator &amp; Full-Stack Developer</p>
        <nav class="site-navigation" aria-label="Portfolio sections">
          <ul>${navigation.map((label, index) => `<li><a href="#${sections[index] ?? 'contact'}">${label}</a></li>`).join('')}</ul>
        </nav>
      </header>
      <main id="portfolio-content" class="portfolio-main">
        ${sections.map((id, index) => `
          <section id="${id}" class="portfolio-section" data-section-index="${index + 1}" aria-labelledby="${id}-heading">
            <p class="route-label">${String(index + 1).padStart(2, '0')} / ${id.toUpperCase()}</p>
            <h2 id="${id}-heading">${navigation[index] ?? 'Contact'}</h2>
            <p>Reliable systems and software evidence for hiring managers and technical interviewers.</p>
            <article>
              <h3>Operational detail</h3>
              <p>Long unbroken technical reference: serviceorchestrationandobservabilityintegrationwithaverylongidentifierexampletestarchitectureproductionreadiness.</p>
              <a href="https://example.test/portfolio/reference">Open project reference</a>
            </article>
          </section>
        `).join('')}
      </main>
      <footer class="site-footer"><a href="mailto:luca@example.test">luca@example.test</a></footer>
    </div>
    </body>
    </html>`;
}

async function loadInformationLayer(page: Page): Promise<void> {
  await page.setContent(informationLayerHarness());
}

async function capture(page: Page, testInfo: TestInfo, name: string): Promise<void> {
  await page.screenshot({ path: testInfo.outputPath(name), fullPage: true });
}

for (const viewport of [
  { width: 320, height: 800 },
  { width: 768, height: 1024 },
  { width: 1440, height: 900 },
  { width: 2560, height: 1440 },
]) {
  test(`keeps information content within the viewport at ${viewport.width}px`, async ({ page }, testInfo) => {
    await page.setViewportSize(viewport);
    await loadInformationLayer(page);

    const geometry = await page.evaluate(() => {
      const root = document.documentElement;
      const boxes = [...document.querySelectorAll<HTMLElement>('.portfolio-shell :is(h1, h2, h3, p, a, article, section)')]
        .map((element) => element.getBoundingClientRect())
        .filter((rect) => rect.width > 0 && rect.height > 0);
      return {
        noOverflow: root.scrollWidth <= root.clientWidth + 1,
        allBoxesFit: boxes.every((rect) => rect.left >= -1 && rect.right <= root.clientWidth + 1),
      };
    });

    await capture(page, testInfo, `information-layer-${viewport.width}.png`);
    expect(geometry.noOverflow).toBe(true);
    expect(geometry.allBoxesFit).toBe(true);
  });
}

test('uses alternating desktop panels while preserving a clear central road corridor', async ({ page }, testInfo) => {
  await page.setViewportSize({ width: 1440, height: 900 });
  await loadInformationLayer(page);

  const panels = await page.locator('.portfolio-main > .portfolio-section').evaluateAll((sections, viewportWidth) =>
    sections.map((section) => {
      const rect = section.getBoundingClientRect();
      return { left: rect.left, right: rect.right, widthRatio: rect.width / Number(viewportWidth) };
    }), 1440,
  );

  expect(panels.every((panel) => panel.widthRatio >= 0.4 && panel.widthRatio <= 0.45)).toBe(true);
  expect(panels.every((panel, index) => index % 2 === 0 ? panel.right <= 1440 * 0.461 : panel.left >= 1440 * 0.539)).toBe(true);
  await capture(page, testInfo, 'information-layer-desktop-corridor.png');
});

test('uses a stable tablet rhythm and a single readable mobile column with usable navigation targets', async ({ page }, testInfo) => {
  await page.setViewportSize({ width: 768, height: 1024 });
  await loadInformationLayer(page);
  const tabletPanels = await page.locator('.portfolio-main > .portfolio-section').evaluateAll((sections) =>
    sections.map((section) => section.getBoundingClientRect()),
  );
  expect(tabletPanels.every((panel) => panel.width < 768 * 0.7)).toBe(true);
  expect(tabletPanels.every((panel, index) => index % 2 === 0 ? panel.left < 768 / 2 : panel.left >= 768 / 2)).toBe(true);
  await capture(page, testInfo, 'information-layer-tablet.png');

  await page.setViewportSize({ width: 320, height: 800 });
  await loadInformationLayer(page);
  const mobile = await page.evaluate(() => {
    const root = document.documentElement;
    const panels = [...document.querySelectorAll<HTMLElement>('.portfolio-main > .portfolio-section')]
      .map((section) => section.getBoundingClientRect());
    const navigationTargets = [...document.querySelectorAll<HTMLElement>('.site-navigation a')]
      .map((link) => link.getBoundingClientRect());
    return {
      singleColumn: panels.every((panel) => panel.left >= 0 && panel.right <= root.clientWidth && panel.width >= root.clientWidth * 0.85),
      touchTargets: navigationTargets.every((target) => target.width >= 44 && target.height >= 44),
    };
  });
  expect(mobile.singleColumn).toBe(true);
  expect(mobile.touchTargets).toBe(true);
  await capture(page, testInfo, 'information-layer-mobile.png');
});

test('removes nonessential information-layer motion when reduced motion is requested', async ({ page }) => {
  await page.emulateMedia({ reducedMotion: 'reduce' });
  await loadInformationLayer(page);
  const duration = await page.locator('.portfolio-section').first().evaluate((element) => getComputedStyle(element).transitionDuration);
  expect(duration).toBe('0.001s');
});

test('creates a clean print portfolio with navigation removed', async ({ page }) => {
  await page.emulateMedia({ media: 'print' });
  await loadInformationLayer(page);
  await expect(page.locator('.site-navigation')).toBeHidden();
  await expect(page.locator('.portfolio-section').first()).toHaveCSS('break-inside', 'avoid');
});