export function selectEvents(events, now = new Date()) {
 const valid=events.filter(e=>e.slug && Number.isFinite(Date.parse(e.start)) && Number.isFinite(Date.parse(e.end)));
 const open=valid.filter(e=>e.status==='open' && Date.parse(e.end)>=now.getTime()).sort((a,b)=>Date.parse(a.start)-Date.parse(b.start));
 const rest=valid.filter(e=>!open.includes(e)).sort((a,b)=>Date.parse(b.start)-Date.parse(a.start));
 return [...open,...rest].slice(0,2);
}
export function eventStatus(e, now = new Date()) {
 if(Date.parse(e.end)<now.getTime())return ['Programa baigta','Registracija baigta.'];
 if(e.status==='full')return ['Grupė pilna','Registracija į šią grupę baigta.'];
 if(e.status==='open')return ['Vyksta registracija','Kviečiu susipažinti su programa.'];
 return ['Registracija baigta','Registracija į šią grupę baigta.'];
}
if(typeof document!=='undefined'){
 const list=document.querySelector('#event-list');
 const pastList=document.querySelector('#past-event-list');
 if(list)fetch('events.json',{cache:'no-cache'}).then(r=>{if(!r.ok)throw Error();return r.json()}).then(events=>{
  const valid=events.filter(e=>e.slug && Number.isFinite(Date.parse(e.start)) && Number.isFinite(Date.parse(e.end)));
  const now=new Date();
  const current=valid.filter(e=>Date.parse(e.end)>=now.getTime()).sort((a,b)=>Date.parse(a.start)-Date.parse(b.start));
  const past=valid.filter(e=>Date.parse(e.end)<now.getTime()).sort((a,b)=>Date.parse(b.start)-Date.parse(a.start));
  const makeCard=e=>{
   if(!/^[a-z0-9-]+$/.test(e.slug))throw Error();
   const article=document.createElement('article');article.className='course event-card';
   const content=document.createElement('div'),actions=document.createElement('div');actions.className='course-actions';
   const [state,note]=eventStatus(e);
   const date=new Intl.DateTimeFormat('lt-LT',{timeZone:'Europe/Vilnius',year:'numeric',month:'long',day:'numeric'});
   for(const [tag,text,cls] of [['span',state,'tag'],['p',`${date.format(new Date(e.start))} – ${date.format(new Date(e.end))}`,'event-date'],['h3',e.title,''],['p',`${e.sessions ?? e.dates.length} susitikimai · ${e.format} · ${e.schedule}`,''],['p',note,'muted']]){
    const el=document.createElement(tag);el.textContent=text;el.className=cls;content.append(el);
   }
   const link=document.createElement('a');link.className='button';link.href=e.slug+'.html';link.textContent='Detaliau ↗';actions.append(link);article.append(content,actions);return article;
  };
  const visible=current.slice(0,2);
  if(visible.length)list.replaceChildren(...visible.map(makeCard));
  else list.innerHTML='<p class="muted">Šiuo metu nėra vykstančių ar artėjančių mokymų.</p>';
  if(pastList)pastList.replaceChildren(...past.map(makeCard));
 }).catch(()=>{/* Preserve the server-generated course card if data cannot load. */});
}