import assert from 'node:assert/strict';
import { build } from 'esbuild';
import { chromium } from '@playwright/test';
import { fileURLToPath } from 'node:url';
import { existsSync } from 'node:fs';
import { presentations } from '../src/server/react/presentation';
import { createStyleFixture } from './style-fixtures';

// Actual React layout effects and the shared scroll-lock hook run in an isolated
// browser. Rerenders/remounts model incoming page payloads without reloading <html>.
const root = fileURLToPath(new URL('..', import.meta.url));
const bundle = await build({
  stdin: {
    resolveDir: root,
    loader: 'tsx',
    contents: `
import {StrictMode} from 'react';
import {createRoot} from 'react-dom/client';
import {PagePresentation} from '@/components/layout/PagePresentation';
import {useScrollLock} from '@/components/ui/Dialog';
function Lock({active}) {useScrollLock(active);return null;}
const root=createRoot(document.getElementById('root'));
let view='about',locked=false,key='shared-page';
function render(){root.render(<StrictMode><PagePresentation key={key} view={view}/><Lock active={locked}/><main id="page-style-probe" className="hk-drama-browse-page hk-site-navigation-page"/></StrictMode>);}
window.__pagePresentation=(next,remount=false)=>{view=next;key=remount?next:'shared-page';render();};
window.__pageLock=(active)=>{locked=active;render();};
render();
`,
  },
  bundle: true,
  platform: 'browser',
  format: 'iife',
  write: false,
  define: { 'process.env.NODE_ENV': '"development"' },
  tsconfig: fileURLToPath(new URL('../tsconfig.json', import.meta.url)),
});
const styles = await createStyleFixture(['base', 'list', 'nav']);
const initial = presentations.about!;
const chrome = process.env.CHROME_PATH || '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome';
const browser = await chromium.launch({ headless: true, ...(existsSync(chrome) ? { executablePath: chrome } : {}) });
try {
  const page = await browser.newPage({ viewport: { width: 1280, height: 720 } });
  const errors: string[] = [];
  page.on('pageerror', error => errors.push(error.message));
  await page.route('**/*', route => route.abort());
  await page.setContent(`<!doctype html><html class="hk-pwa-standalone hk-age-gate-ok" data-hk-page-styles="${initial.styleTokens.join(' ')}" data-presentation-unrelated="keep"><head><style>${styles.css}</style></head><body class="${initial.bodyClass} hk-is-managing hk-drawer-open external-plugin-state" style="overflow:auto"><div id="root"></div></body></html>`);
  const documentIdentity = await page.evaluate(() => {
    const token = Math.random().toString(36);
    (window as unknown as { __documentIdentity: string }).__documentIdentity = token;
    return token;
  });
  await page.addScriptTag({ content: bundle.outputFiles[0]!.text });
  const managed = [...new Set(Object.values(presentations).flatMap(({ bodyClass }) => bodyClass.split(/\s+/).filter(Boolean)))];
  let mobile = false;
  const verify = async (view: string, remount = false) => {
    const expected = presentations[view] || presentations['404']!;
    await page.evaluate(({ view, remount }) => {
      (window as unknown as { __pagePresentation(view: string, remount: boolean): void }).__pagePresentation(view, remount);
    }, { view, remount });
    await page.waitForFunction(({ tokens, classes, managed }) => {
      const active = new Set(classes.split(/\s+/).filter(Boolean));
      return document.documentElement.getAttribute('data-hk-page-styles') === tokens &&
        managed.every(name => document.body.classList.contains(name) === active.has(name));
    }, { tokens: expected.styleTokens.join(' '), classes: expected.bodyClass, managed });
    const state = await page.evaluate(() => ({
      identity: (window as unknown as { __documentIdentity: string }).__documentIdentity,
      htmlClasses: [...document.documentElement.classList],
      other: document.documentElement.getAttribute('data-presentation-unrelated'),
      classes: [...document.body.classList],
      overflow: document.body.style.overflow,
      probePadding: getComputedStyle(document.getElementById('page-style-probe')!).paddingTop,
    }));
    assert.equal(state.identity, documentIdentity, 'presentation updates must not reload the document');
    assert.ok(state.htmlClasses.includes('hk-pwa-standalone'));
    assert.ok(state.htmlClasses.includes('hk-age-gate-ok'));
    assert.equal(state.other, 'keep');
    for (const name of ['hk-is-managing', 'hk-drawer-open', 'external-plugin-state']) assert.ok(state.classes.includes(name), view + ' erased ' + name);
    assert.equal(state.overflow, 'hidden', view + ' released a live scroll lock');
    if (view === 'nav') assert.equal(state.probePadding, mobile ? '64px' : '132px');
    if (view === 'list') assert.equal(state.probePadding, mobile ? '56px' : '72px');
  };
  await page.evaluate(() => (window as unknown as { __pageLock(active: boolean): void }).__pageLock(true));
  await page.waitForFunction(() => document.body.style.overflow === 'hidden');
  for (const removed of ['profile', 'setting', 'history', 'favorites', 'purchased', 'recharge', 'login', 'register']) assert.equal(presentations[removed], undefined, 'removed account view still has a presentation: ' + removed);
  for (const view of Object.keys(presentations)) await verify(view);
  for (const view of ['list', 'nav', 'help', 'privacy', 'about', '__missing-view', 'list']) await verify(view, true);
  mobile = true;
  await page.setViewportSize({ width: 375, height: 812 });
  for (const view of ['nav', 'list', 'about']) await verify(view);
  await page.evaluate(() => (window as unknown as { __pageLock(active: boolean): void }).__pageLock(false));
  await page.waitForFunction(() => document.body.style.overflow === 'auto');
  assert.deepEqual(errors, []);
  console.log(`Page presentation browser regression passed: ${Object.keys(presentations).length} views, remount/back transitions, real scoped CSS, PWA/temporary class preservation and shared scroll-lock restoration.`);
} finally {
  await browser.close();
}