// ═══════════════════════════════════════════
// STEELPULSE PREMIUM CALENDAR v3
// /static/calendar.js
// ═══════════════════════════════════════════
var _calInited=false, _calView='month', _calDate=new Date(), _calEvs=[];
var _cemKat='Gym', _cemCol='#E63946';
var _calTz=Intl.DateTimeFormat().resolvedOptions().timeZone;
var _calNowTimer=null;

var _MJN=['Siječanj','Veljača','Ožujak','Travanj','Svibanj','Lipanj',
          'Srpanj','Kolovoz','Rujan','Listopad','Studeni','Prosinac'];
var _ROWN=['Pon','Uto','Sri','Čet','Pet','Sub','Ned'];
var _KAT_BOJE={
  'Gym':'#E63946','Posao':'#3B82F6','Zdravlje':'#22C55E',
  'Prehrana':'#F59E0B','Odmor':'#A855F7','Osobno':'#06B6D4','Trening':'#E63946'
};

function calInit(){
  if(_calInited)return; _calInited=true;
  _calDate=new Date();
  calDetectTz(); calFillYears(); calLoad();
  if(window.innerWidth<=640) setTimeout(function(){calMobView('agenda');},200);
}

function calDetectTz(){
  _calTz=Intl.DateTimeFormat().resolvedOptions().timeZone;
  var off=-new Date().getTimezoneOffset();
  var h=Math.floor(Math.abs(off)/60), m=Math.abs(off)%60;
  var s=off>=0?'+':'-';
  var lbl=_calTz.split('/').pop().replace('_',' ')+' UTC'+s+String(h).padStart(2,'0')+':'+String(m).padStart(2,'0');
  var el=document.getElementById('calTzLbl'); if(el)el.textContent='⏱ '+lbl;
}

function calFillYears(){
  var sel=document.getElementById('calYearSel'); if(!sel||sel.options.length>10)return;
  for(var y=2025;y<=5000;y++){
    var o=document.createElement('option'); o.value=y; o.text=y;
    if(y===new Date().getFullYear())o.selected=true;
    sel.appendChild(o);
  }
}

function calSetYear(y){ _calDate.setFullYear(parseInt(y)); calLoad(); }

async function calLoad(){
  calDetectTz();
  var y=_calDate.getFullYear(), m=_calDate.getMonth();
  var od=new Date(y,m-1,1).toISOString().slice(0,10)+'T00:00:00';
  var do_=new Date(y,m+2,0).toISOString().slice(0,10)+'T23:59:59';
  try{
    var r=await fetchAuth('/api/kalendar?od='+od+'&do='+do_);
    if(r&&r.ok){ var d=await r.json(); _calEvs=Array.isArray(d)?d:[]; }
    else _calEvs=[];
  }catch(e){_calEvs=[];}
  var ys=document.getElementById('calYearSel'); if(ys)ys.value=_calDate.getFullYear();
  calRender(); calRenderMini(); calRenderUpcoming();
}

function calNav(dir){
  if(_calView==='month') _calDate.setMonth(_calDate.getMonth()+dir);
  else _calDate.setDate(_calDate.getDate()+dir*7);
  calLoad();
}
function calGoToday(){ _calDate=new Date(); calLoad(); }

function calView(v){
  _calView=v;
  document.getElementById('cvbM').className='cal-vbtn'+(v==='month'?' on':'');
  document.getElementById('cvbW').className='cal-vbtn'+(v==='week'?' on':'');
  var g=document.getElementById('calGrid'); if(g)g.style.display=v==='month'?'flex':'none';
  var w=document.getElementById('calWeekGrid'); if(w)w.style.display=v==='week'?'flex':'none';
  var dr=document.getElementById('calDowRow'); if(dr)dr.style.display=v==='month'?'':'none';
  if(v==='month') calRenderMonth();
  else if(v==='week') calRenderWeek();
}

function calMobView(v){
  ['calMobM','calMobW','calMobA'].forEach(function(id,i){
    var el=document.getElementById(id); if(!el)return;
    var active=(v==='month'&&i===0)||(v==='week'&&i===1)||(v==='agenda'&&i===2);
    el.className='cal-mob-vbtn'+(active?' on':'');
  });
  if(v==='agenda'){ _calView='agenda'; _showAgendaLayout(); calRenderAgenda(); }
  else calView(v);
}

function _showAgendaLayout(){
  var g=document.getElementById('calGrid'); if(g)g.style.display='flex';
  var w=document.getElementById('calWeekGrid'); if(w)w.style.display='none';
  var dr=document.getElementById('calDowRow'); if(dr)dr.style.display='none';
}

function calRender(){
  if(_calView==='month') calRenderMonth();
  else if(_calView==='week') calRenderWeek();
  else calRenderAgenda();
}

function _ds(d){ return d.getFullYear()+'-'+String(d.getMonth()+1).padStart(2,'0')+'-'+String(d.getDate()).padStart(2,'0'); }

// ── MONTH ──────────────────────────────────
function calRenderMonth(){
  var y=_calDate.getFullYear(), m=_calDate.getMonth();
  document.getElementById('calMonthLbl').textContent=_MJN[m].toUpperCase()+' '+y;
  var today=new Date();
  var fd=new Date(y,m,1).getDay(); fd=fd===0?6:fd-1;
  var ld=new Date(y,m+1,0).getDate();
  var pl=new Date(y,m,0).getDate();
  var total=Math.ceil((fd+ld)/7)*7;
  var cells=document.getElementById('calCells');
  cells.innerHTML='';
  cells.style.gridTemplateRows='repeat('+Math.ceil(total/7)+',1fr)';

  for(var i=0;i<total;i++){
    var day,inM=true;
    if(i<fd){day=pl-fd+i+1;inM=false;}
    else if(i>=fd+ld){day=i-fd-ld+1;inM=false;}
    else day=i-fd+1;
    var cm=inM?m:(i<fd?m-1:m+1);
    var cd=new Date(y,cm,day);
    var cs=_ds(cd);
    var isToday=cd.toDateString()===today.toDateString();
    var isSun=(cd.getDay()===0), isSat=(cd.getDay()===6);

    var cell=document.createElement('div');
    cell.className='cal-cell'+((!inM)?' other':'')+(isToday?' today':'');
    cell.onclick=(function(s){return function(){calNewEvent(s);};})(cs);

    var dn=document.createElement('div'); dn.className='cal-dn';
    if(isSat||isSun) dn.style.color='rgba(230,57,70,.7)';
    dn.textContent=day; cell.appendChild(dn);

    var dayEvs=_calEvs.filter(function(e){return e&&e.pocetak&&e.pocetak.slice(0,10)===cs;});
    var shown=0;
    dayEvs.forEach(function(e){
      if(shown>=3)return;
      var ev=document.createElement('div'); ev.className='cal-ev';
      ev.style.background=(e.boja||_KAT_BOJE[e.kategorija]||'#E63946');
      ev.title=e.naslov+(e.pocetak?' '+e.pocetak.slice(11,16):'');
      ev.textContent=e.naslov;
      ev.onclick=(function(ed){return function(evt){evt.stopPropagation();calOpenEdit(ed);};})(e);
      cell.appendChild(ev); shown++;
    });
    if(dayEvs.length>3){
      var more=document.createElement('div'); more.className='cal-more';
      more.textContent='+'+(dayEvs.length-3)+' više'; cell.appendChild(more);
    }
    cells.appendChild(cell);
  }
}

// ── WEEK ──────────────────────────────────
function calRenderWeek(){
  var today=new Date(), d=new Date(_calDate);
  var dow=d.getDay(); dow=dow===0?6:dow-1; d.setDate(d.getDate()-dow);
  var days=[]; for(var i=0;i<7;i++){var dd=new Date(d);dd.setDate(d.getDate()+i);days.push(dd);}
  var s=days[0].toLocaleDateString('hr-HR',{day:'2-digit',month:'short'});
  var e=days[6].toLocaleDateString('hr-HR',{day:'2-digit',month:'short'});
  document.getElementById('calMonthLbl').textContent=s+' – '+e+' '+days[0].getFullYear();

  var head=document.getElementById('calWeekHead');
  head.style.gridTemplateColumns='48px repeat(7,1fr)';
  head.innerHTML='<div style="border-right:1px solid var(--b2)"></div>';
  days.forEach(function(dd,i){
    var isT=dd.toDateString()===today.toDateString();
    var div=document.createElement('div');
    div.className='cal-whd'+(isT?' cal-wtoday':'');
    div.innerHTML='<div style="font-size:8px;letter-spacing:2px;color:var(--t3)">'+_ROWN[i]+'</div>'
      +'<div class="cal-whd-day">'+dd.getDate()+'</div>';
    head.appendChild(div);
  });

  var H=56; // px per hour
  var cols=document.getElementById('calWeekCols');
  cols.style.gridTemplateColumns='48px repeat(7,1fr)';
  cols.style.minHeight=(24*H)+'px';
  cols.innerHTML='';

  // Time column
  var tc=document.createElement('div'); tc.className='cal-time-col';
  for(var h=0;h<24;h++){
    var ts=document.createElement('div'); ts.className='cal-ts';
    ts.textContent=String(h).padStart(2,'0')+':00';
    ts.style.height=H+'px';
    tc.appendChild(ts);
  }
  cols.appendChild(tc);

  // Day columns
  days.forEach(function(dd){
    var ds=_ds(dd);
    var col=document.createElement('div'); col.className='cal-wday'; col.style.height=(24*H)+'px';
    for(var h=0;h<24;h++){
      var ln=document.createElement('div'); ln.className='cal-wline';
      ln.style.height=H+'px'; col.appendChild(ln);
    }
    _calEvs.filter(function(ev){return ev&&ev.pocetak&&ev.pocetak.slice(0,10)===ds;}).forEach(function(ev){
      var sh=parseInt(ev.pocetak.slice(11,13)),sm=parseInt(ev.pocetak.slice(14,16));
      var eh=ev.kraj?parseInt(ev.kraj.slice(11,13)):sh+1;
      var em=ev.kraj?parseInt(ev.kraj.slice(14,16)):sm;
      var top=sh*H+(sm/60*H), height=Math.max(20,(eh-sh)*H+((em-sm)/60*H));
      var blk=document.createElement('div'); blk.className='cal-evblock';
      blk.style.cssText='top:'+top+'px;height:'+height+'px;background:'+(ev.boja||_KAT_BOJE[ev.kategorija]||'#E63946');
      blk.innerHTML='<div style="font-size:10px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis">'+ev.naslov+'</div>'
        +(ev.pocetak?'<div style="font-size:8px;opacity:.75">'+ev.pocetak.slice(11,16)+(ev.kraj?' – '+ev.kraj.slice(11,16):'')+'</div>':'');
      blk.onclick=(function(ed){return function(){calOpenEdit(ed);};})(ev);
      col.appendChild(blk);
    });
    col.onclick=(function(s){return function(e){if(e.target===col||e.target.classList.contains('cal-wline'))calNewEvent(s);};})(ds);
    cols.appendChild(col);
  });

  // Current time line
  calDrawNowLine(days, H);
  if(_calNowTimer) clearInterval(_calNowTimer);
  _calNowTimer=setInterval(function(){ calDrawNowLine(days, H); }, 60000);
}

function calDrawNowLine(days, H){
  // Remove existing lines
  document.querySelectorAll('.cal-now-line').forEach(function(el){el.remove();});
  var now=new Date();
  var nowStr=_ds(now);
  // Find which column
  var cols=document.getElementById('calWeekCols'); if(!cols)return;
  var dayCols=cols.querySelectorAll('.cal-wday');
  days.forEach(function(dd,i){
    if(_ds(dd)!==nowStr)return;
    var col=dayCols[i]; if(!col)return;
    var top=(now.getHours()*H)+(now.getMinutes()/60*H);
    var line=document.createElement('div'); line.className='cal-now-line';
    line.style.top=top+'px';
    col.appendChild(line);
    // Scroll to current time
    var scroll=document.getElementById('calWeekScroll');
    if(scroll) scroll.scrollTop=Math.max(0,top-100);
  });
}

// ── MINI ──────────────────────────────────
function calRenderMini(){
  var y=_calDate.getFullYear(), m=_calDate.getMonth();
  var el=document.getElementById('calMiniTitle'); if(el)el.textContent=_MJN[m].slice(0,3)+' '+y;
  var fd=new Date(y,m,1).getDay(); fd=fd===0?6:fd-1;
  var ld=new Date(y,m+1,0).getDate(), total=Math.ceil((fd+ld)/7)*7;
  var cont=document.getElementById('calMiniCells'); if(!cont)return;
  cont.innerHTML=''; var today=new Date();
  for(var i=0;i<total;i++){
    var day=i-fd+1;
    if(day<1||day>ld){cont.appendChild(document.createElement('div'));continue;}
    var cd=new Date(y,m,day), cs=_ds(cd);
    var isT=cd.toDateString()===today.toDateString();
    var hasEv=_calEvs.some(function(e){return e&&e.pocetak&&e.pocetak.slice(0,10)===cs;});
    var mc=document.createElement('div');
    mc.className='cal-mc'+(isT?' mc-today':'')+(hasEv?' mc-has':'');
    mc.textContent=day;
    mc.onclick=(function(s){return function(){_calDate=new Date(s);calLoad();};})(cs);
    cont.appendChild(mc);
  }
}

// ── UPCOMING ──────────────────────────────
function calRenderUpcoming(){
  var el=document.getElementById('calUpcoming'); if(!el)return;
  var now=new Date();
  var ups=_calEvs.filter(function(e){return e&&e.pocetak&&new Date(e.pocetak)>=now;})
    .sort(function(a,b){return new Date(a.pocetak)-new Date(b.pocetak);}).slice(0,10);
  if(!ups.length){el.innerHTML='<div style="font-size:10px;color:var(--t3);padding:8px 0">Nema nadolazecih eventa</div>';return;}
  el.innerHTML='';
  ups.forEach(function(e){
    var d=new Date(e.pocetak);
    var isT=d.toDateString()===now.toDateString();
    var isM=d.toDateString()===new Date(now.getTime()+86400000).toDateString();
    var lbl=isT?'Danas':(isM?'Sutra':d.toLocaleDateString('hr-HR',{day:'2-digit',month:'short'}));
    var time=e.cijeli_dan?'':' '+e.pocetak.slice(11,16);
    var row=document.createElement('div'); row.className='cal-uev';
    row.innerHTML='<div class="cal-udot" style="background:'+(e.boja||'#E63946')+'"></div>'
      +'<div style="flex:1;min-width:0">'
      +'<div class="cal-utitle">'+e.naslov+'</div>'
      +'<div class="cal-utime">'+lbl+time+(e.lokacija?' · '+e.lokacija:'')+'</div>'
      +'</div>';
    row.onclick=(function(ed){return function(){calOpenEdit(ed);};})(e);
    el.appendChild(row);
  });
}

// ── AGENDA ──────────────────────────────────
function calRenderAgenda(){
  _showAgendaLayout();
  var today=new Date();
  var y=_calDate.getFullYear(), m=_calDate.getMonth();
  document.getElementById('calMonthLbl').textContent=_MJN[m].toUpperCase()+' '+y;
  var monthEvs=_calEvs.filter(function(e){return e&&e.pocetak&&e.pocetak.slice(0,7)===(y+'-'+String(m+1).padStart(2,'0'));})
    .sort(function(a,b){return new Date(a.pocetak)-new Date(b.pocetak);});
  var cells=document.getElementById('calCells');
  cells.style.gridTemplateColumns='1fr';
  cells.style.gridTemplateRows='auto';
  cells.innerHTML='';
  if(!monthEvs.length){
    var emp=document.createElement('div');
    emp.style.cssText='padding:32px 16px;text-align:center;color:var(--t3);font-size:11px;letter-spacing:2px';
    emp.textContent='NEMA EVENTA U OVOM MJESECU';
    cells.appendChild(emp); return;
  }
  var lastDate='';
  monthEvs.forEach(function(e){
    var d=new Date(e.pocetak), ds=e.pocetak.slice(0,10);
    var isToday=d.toDateString()===today.toDateString();
    if(ds!==lastDate){
      lastDate=ds;
      var dayN=d.toLocaleDateString('hr-HR',{weekday:'short'}).toUpperCase();
      var hdr=document.createElement('div');
      hdr.style.cssText='display:flex;align-items:center;gap:12px;padding:10px 12px 4px;border-top:1px solid var(--b2);margin-top:4px';
      hdr.innerHTML='<div style="text-align:center;min-width:40px">'
        +'<div style="font-size:7px;letter-spacing:2px;color:var(--t3)">'+dayN+'</div>'
        +'<div style="font-family:Anton,sans-serif;font-size:24px;line-height:1;color:'+(isToday?'var(--accent)':'var(--t0)')+'">'+d.getDate()+'</div>'
        +'<div style="font-size:8px;color:var(--t3)">'+_MJN[d.getMonth()].slice(0,3)+'</div>'
        +'</div>'
        +'<div style="flex:1;height:1px;background:'+(isToday?'var(--accent)':'var(--b2)')+'"></div>';
      cells.appendChild(hdr);
    }
    var time=e.cijeli_dan?'Cijeli dan':e.pocetak.slice(11,16)+(e.kraj?' – '+e.kraj.slice(11,16):'');
    var boja=e.boja||'#E63946';
    var row=document.createElement('div');
    row.style.cssText='display:flex;align-items:center;gap:10px;padding:10px 12px 10px 64px;'
      +'border-radius:8px;margin:2px 8px;cursor:pointer;background:var(--bg-card);'
      +'border-left:3px solid '+boja+';transition:background .1s';
    row.innerHTML='<div style="flex:1;min-width:0">'
      +'<div style="font-size:13px;font-weight:600;color:var(--t0);white-space:nowrap;overflow:hidden;text-overflow:ellipsis">'+e.naslov+'</div>'
      +'<div style="font-size:10px;color:var(--t3);margin-top:2px">'+time+(e.lokacija?' · '+e.lokacija:'')+'</div>'
      +'</div><div style="width:8px;height:8px;border-radius:50%;background:'+boja+';flex-shrink:0"></div>';
    row.onclick=(function(ed){return function(){calOpenEdit(ed);};})(e);
    cells.appendChild(row);
  });
}

// ── MODAL ──────────────────────────────────
function calNewEvent(dateStr){
  document.getElementById('cemId').value='';
  document.getElementById('cemTitle').textContent='Novi event';
  document.getElementById('cemDelBtn').style.display='none';
  ['cemNaslov','cemOpis','cemLok'].forEach(function(id){document.getElementById(id).value='';});
  document.getElementById('cemCijeli').checked=false;
  document.getElementById('cemPods').value='15';
  _cemKat='Gym'; _cemCol='#E63946';
  document.querySelectorAll('.cem-kat').forEach(function(b,i){b.className='cem-kat'+(i===0?' on':'');});
  document.querySelectorAll('.cem-col').forEach(function(d,i){d.className='cem-col'+(i===0?' on':'');});
  var base=dateStr?new Date(dateStr):new Date(); base.setHours(10,0,0,0);
  var end=new Date(base); end.setHours(11);
  document.getElementById('cemOd').type='datetime-local';
  document.getElementById('cemDo').type='datetime-local';
  document.getElementById('cemOd').value=_iso(base);
  document.getElementById('cemDo').value=_iso(end);
  document.getElementById('calEvModal').className='open';
  setTimeout(function(){document.getElementById('cemNaslov').focus();},100);
}

function calOpenEdit(ev){
  if(ev.auto)return;
  document.getElementById('cemId').value=ev.id;
  document.getElementById('cemTitle').textContent='Uredi event';
  document.getElementById('cemDelBtn').style.display='inline-block';
  document.getElementById('cemNaslov').value=ev.naslov||'';
  document.getElementById('cemOpis').value=ev.opis||'';
  document.getElementById('cemLok').value=ev.lokacija||'';
  document.getElementById('cemCijeli').checked=!!ev.cijeli_dan;
  document.getElementById('cemPods').value=String(ev.podsjetnik||15);
  _cemKat=ev.kategorija||'Gym'; _cemCol=ev.boja||'#E63946';
  document.querySelectorAll('.cem-kat').forEach(function(b){b.className='cem-kat'+(b.textContent.indexOf(_cemKat)>=0?' on':'');});
  document.querySelectorAll('.cem-col').forEach(function(d){d.className='cem-col'+(d.style.background===_cemCol?' on':'');});
  var po=ev.pocetak?ev.pocetak.replace(' ','T').slice(0,16):'';
  var kr=ev.kraj?ev.kraj.replace(' ','T').slice(0,16):'';
  if(ev.cijeli_dan){
    document.getElementById('cemOd').type='date'; document.getElementById('cemDo').type='date';
    document.getElementById('cemOd').value=po.slice(0,10); document.getElementById('cemDo').value=kr.slice(0,10);
  }else{
    document.getElementById('cemOd').type='datetime-local'; document.getElementById('cemDo').type='datetime-local';
    document.getElementById('cemOd').value=po; document.getElementById('cemDo').value=kr;
  }
  document.getElementById('calEvModal').className='open';
}
function calCloseModal(){document.getElementById('calEvModal').className='';}
function cemKat(el,kat){
  _cemKat=kat;
  document.querySelectorAll('.cem-kat').forEach(function(b){b.className='cem-kat';});
  el.className='cem-kat on';
  var ab=_KAT_BOJE[kat];
  if(ab){_cemCol=ab;document.querySelectorAll('.cem-col').forEach(function(d){d.className='cem-col'+(d.style.background===ab?' on':'');});}
}
function cemColor(el,col){_cemCol=col;document.querySelectorAll('.cem-col').forEach(function(d){d.className='cem-col';});el.className='cem-col on';}
function cemTogCijeli(){var cd=document.getElementById('cemCijeli').checked;document.getElementById('cemOd').type=cd?'date':'datetime-local';document.getElementById('cemDo').type=cd?'date':'datetime-local';}

async function cemSave(){
  var id=document.getElementById('cemId').value;
  var od=document.getElementById('cemOd').value;
  if(!od){alert('Unesite datum pocetka!');return;}
  var payload={
    naslov:document.getElementById('cemNaslov').value||'Bez naziva',
    opis:document.getElementById('cemOpis').value,
    kategorija:_cemKat, boja:_cemCol,
    pocetak:od.replace('T',' '),
    kraj:(document.getElementById('cemDo').value||'').replace('T',' ')||null,
    cijeli_dan:document.getElementById('cemCijeli').checked?1:0,
    lokacija:document.getElementById('cemLok').value,
    podsjetnik:parseInt(document.getElementById('cemPods').value)||0,
    ponavljanje:'nikad'
  };
  try{
    var r=await fetchAuth(id?'/api/kalendar/'+id:'/api/kalendar',{method:id?'PUT':'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify(payload)});
    if(!r||!r.ok){var err={};try{err=await r.json();}catch(x){};alert('Greska: '+(err.greska||r.status));return;}
    calCloseModal();
    if(!id&&od) _calDate=new Date(od.replace(' ','T'));
    calLoad();
  }catch(e){alert('Greska: '+e);}
}
async function cemDelete(){
  var id=document.getElementById('cemId').value;
  if(!id||!confirm('Obrisati event?'))return;
  try{await fetchAuth('/api/kalendar/'+id,{method:'DELETE'});calCloseModal();calLoad();}catch(e){alert('Greska: '+e);}
}
async function calExport(){
  try{var r=await fetchAuth('/api/kalendar/export.ics');if(!r||!r.ok){alert('Greska');return;}
  var t=await r.text();var b=new Blob([t],{type:'text/calendar'});var a=document.createElement('a');
  a.href=URL.createObjectURL(b);a.download='steelpulse.ics';a.click();URL.revokeObjectURL(a.href);}
  catch(e){alert('Greska: '+e);}
}

// ── FAB ──────────────────────────────────
function calFabToggle(){
  var m=document.getElementById('calFabMenu'), b=document.getElementById('calFabMainBtn');
  if(!m)return;
  var open=m.className==='open'; m.className=open?'':'open'; b.textContent=open?'＋':'✕';
}
function calFabClose(){
  var m=document.getElementById('calFabMenu'), b=document.getElementById('calFabMainBtn');
  if(m)m.className=''; if(b)b.textContent='＋';
}

// ── AI GENERIRAJ ──────────────────────────
async function calAiGeneriraj(sync){
  // Pitaj za preferirano vrijeme
  var savedTime = localStorage.getItem('sp_gym_time') || '17:00';
  var time = prompt('U koje vrijeme obično ideš u gym?\n(Format: HH:MM)', savedTime);
  if(!time) return;
  // Validiraj format
  if(!/^([01]?[0-9]|2[0-3]):[0-5][0-9]$/.test(time)){
    alert('Neispravan format! Unesi npr: 17:00 ili 08:30'); return;
  }
  localStorage.setItem('sp_gym_time', time);

  var btn=document.getElementById('calAiBtn');
  if(btn){btn.textContent='Generira...';btn.disabled=true;}
  try{
    var url=sync?'/api/kalendar/ai-sync':'/api/kalendar/ai-generiraj';
    var r=await fetchAuth(url,{method:'POST',headers:{'Content-Type':'application/json'},
      body:JSON.stringify({gym_time: time})});
    if(!r||!r.ok){var err={};try{err=await r.json();}catch(x){}; alert('Greska: '+(err.greska||r.status));}
    else{var d=await r.json(); alert(d.kreirani===0?'Svi gym eventi vec postoje za 4 tjedna!':'OK '+d.poruka); calLoad();}
  }catch(e){alert('Greska: '+e);}
  finally{if(btn){btn.textContent='AI GENERIRAJ GYM';btn.disabled=false;}}
}

// ── UTILS ────────────────────────────────
function _iso(d){var p=function(n){return String(n).padStart(2,'0');};return d.getFullYear()+'-'+p(d.getMonth()+1)+'-'+p(d.getDate())+'T'+p(d.getHours())+':'+p(d.getMinutes());}

// Swipe
(function(){
  var sx=0, sy=0;
  document.addEventListener('touchstart',function(e){if(document.getElementById('calEvModal').className==='open')return;sx=e.touches[0].clientX;sy=e.touches[0].clientY;},{passive:true});
  document.addEventListener('touchend',function(e){
    if(document.getElementById('calEvModal').className==='open')return;
    if(!document.getElementById('tab-cal').classList.contains('active'))return;
    var dx=e.changedTouches[0].clientX-sx, dy=e.changedTouches[0].clientY-sy;
    if(Math.abs(dx)>Math.abs(dy)&&Math.abs(dx)>50) calNav(dx<0?1:-1);
  },{passive:true});
})();

// Timezone poll
setInterval(function(){var tz=Intl.DateTimeFormat().resolvedOptions().timeZone;if(tz!==_calTz){_calTz=tz;calDetectTz();}},60000);

// ESC + click outside
document.addEventListener('keydown',function(e){if(e.key==='Escape')calCloseModal();});
document.addEventListener('click',function(e){var m=document.getElementById('calEvModal');if(m&&e.target===m)calCloseModal();});