"""Chromium isolation: exercise actual gallery controls / AJAX fallback; no live server."""
from pathlib import Path
import re,json
from playwright.sync_api import sync_playwright
ROOT=Path(__file__).resolve().parents[1]
original=(ROOT/'app/templates/theme-gallery.html').read_text(encoding='utf-8')
script=re.search(r'<script>(.*?)</script>',original,re.S).group(1)
source=original.replace('<script>'+script+'</script>','')
errors=[]
with sync_playwright() as p:
 browser=p.chromium.launch(executable_path='/usr/bin/chromium',headless=True,args=['--no-sandbox','--disable-dev-shm-usage'])
 page=browser.new_page(viewport={'width':1440,'height':900})
 page.on('pageerror',lambda e:errors.append(str(e)))
 page.set_content(source)
 page.evaluate('''()=>{window.__galleryOk=true;window.fetch=async(url)=>{
  const isPreview=String(url).includes('/preview?'),success=!isPreview||window.__galleryOk;
  const data=[{version:'1.4.1'},{version:'1.4.0'}];
  return {ok:success,status:success?200:503,headers:{get:()=>isPreview?'text/html':'application/json'},json:async()=>data};
 }}''')
 page.add_script_tag(content=script)
 page.wait_for_function("document.querySelector('#preview').getAttribute('src')?.includes('page_type=home')")
 assert page.locator('#version option').count()==3
 page.evaluate('window.__galleryOk=false')
 page.locator('#page').select_option('product')
 page.wait_for_function("document.querySelector('#retryPreview').hidden===false")
 assert '503' in page.locator('#previewStatus').inner_text()
 assert 'page_type=product' in page.locator('#openPreview').get_attribute('href')
 assert not errors,errors
 page.set_viewport_size({'width':390,'height':844})
 assert not page.evaluate('document.documentElement.scrollWidth>innerWidth+1')
 browser.close()
print(json.dumps({'gallery_controls':True,'versions':True,'retry_error':True,'mobile390':True,'javascript_errors':errors},ensure_ascii=False))