var TODAY = new Date(); TODAY.setHours(0,0,0,0);
var goals = [], prefs, selDay = {}, addAmt = {}, renamingId = null, renameVal = '', collapsed = {};
var userName = '', isAdmin = false;

var STRINGS = {
  de: {
    hint:'Menü → "Zum Startbildschirm" für App-Icon',
    emptyLine1:'Noch keine Ziele.',emptyLine2:'Tippe auf + um zu starten.',
    noEntry:'Noch kein Eintrag',log:'Eintragen',
    noch:'Noch',dAbbr:'T',endet:'endet',todayShort:'heute',total:'total',
    todayHeading:'Heute',done2:'Gemacht',dailyGoal:'Tagesziel',remaining:'Noch',
    history:'Verlauf — heute & gestern bearbeitbar',
    legBuf:'Puffer',legDone:'Erreicht',legPartial:'Teilweise',legMissed:'Verpasst',
    delGoal:'Ziel löschen',
    qbLabel:'Quick-Buchen',openLabel:'Offen',doneToday:'Heute erledigt',
    hello:'Hallo {n}!',
    confirmDelete:'Ziel wirklich löschen?',errDelete:'Fehler beim Löschen',errSave:'Speicherfehler',
    loginTitle:'Anmelden',emailLabel:'E-Mail',passwordLabel:'Passwort',loginBtn:'Anmelden',
    forgotPw:'Passwort vergessen?',
    loginErrEmpty:'Bitte E-Mail und Passwort eingeben',
    loginErrWrong:'Falsche E-Mail oder Passwort',loginErrRate:'Zu viele Versuche',loginErrConn:'Verbindungsfehler',
    forgotTitle:'Passwort vergessen',forgotSub:'Wir schicken dir einen Reset-Link',
    sendLink:'Link senden',back:'Zurück',
    emailSentTitle:'E-Mail gesendet',
    emailSentSub:'Falls die Adresse bekannt ist, erhältst du in Kürze einen Reset-Link.',
    ok:'OK',
    resetTitle:'Neues Passwort',newPwLabel:'Neues Passwort',setPw:'Passwort setzen',min8:'mind. 8 Zeichen',
    pwChangedTitle:'Passwort geändert',pwChangedSub:'Du kannst dich jetzt anmelden.',
    changeNameTitle:'Name ändern',yourName:'Dein Name',save:'Speichern',cancel:'Abbrechen',
    errNameEmpty:'Name darf nicht leer sein',errNameSave:'Fehler beim Speichern',nameSaved:'Name gespeichert',
    changePwTitle:'Passwort ändern',currentPwLabel:'Aktuelles Passwort',
    newPwConfLabel:'Neues Passwort bestätigen',changePwBtn:'Ändern',
    errPwMismatch:'Die neuen Passwörter stimmen nicht überein',pwChanged:'Passwort geändert',
    registerTitle:'Konto erstellen',registerSub:'Du wurdest eingeladen',
    namePlaceholder:'Wie sollen wir dich nennen?',pwConfLabel:'Passwort bestätigen',
    pwPlaceholder:'Passwort wiederholen',registerBtn:'Registrieren',
    errPwMismatch2:'Passwörter stimmen nicht überein',errFillAll:'Bitte alle Felder ausfüllen',
    newGoalTitle:'Neues Ziel',exerciseLabel:'Übung / Gewohnheit',exercisePlaceholder:'Liegestütz, Plank …',
    unitLabel:'Einheit',unitDefault:'Stück',daysLabel:'Dauer in Tagen',
    dailyLabel:'Tagesziel',weeklyLabel:'Wochenziel',startGoal:'Ziel starten',errCreate:'Fehler beim Erstellen',
    dataMenuTitle:'Daten verwalten',dataMenuSub:'Export, Import und Backup',
    exportLabel:'Exportieren',exportSub:'Alle Ziele als JSON-Datei speichern',
    importLabel:'Importieren',importSub:'Backup laden oder zusammenführen',
    inviteLabel:'Freund einladen',inviteSub:'Einladungslink generieren',
    inviteListLabel:'Meine Einladungen',inviteListSub:'Status aller gesendeten Einladungen',
    changeName:'Name ändern',changePw:'Passwort ändern',logout:'Abmelden',close:'Schließen',
    clearAll:'Alle Daten löschen',clearAllSub:'Kann nicht rückgängig gemacht werden',
    confirmClear:'Alle Daten löschen?',
    inviteFormTitle:'Freund einladen',inviteFormSub:'Link gilt 7 Tage und kann nur einmal verwendet werden',
    inviteNameLabel:'Name (für deine Übersicht)',inviteNamePlaceholder:'z.B. Max',
    generateLink:'Link generieren',inviteLinkTitle:'Einladungslink',
    copyLink:'Link kopieren',linkCopied:'Link kopiert!',errGenerate:'Fehler beim Generieren',
    noInvites:'Noch keine Einladungen verschickt',
    statusPending:'Ausstehend',statusUsed:'Angenommen',statusExpired:'Abgelaufen',
    errLoad:'Fehler beim Laden',
    confirmImport:'{n} Ziel(e) importieren?',importDone:'{n} Ziel(e) importiert.',invalidFormat:'Ungültiges Format',
    linkLabel:'Link',doneLabel:'gemacht',ofLabel:'von',
    gestern:'Gestern',heute:'Heute',
    expiresAt:'läuft ab:',acceptedBy:'→',
    adminLabel:'Nutzer',adminColName:'Name',adminColEmail:'E-Mail',adminColRegistered:'Registriert',
  },
  en: {
    hint:'Menu → "Add to Home Screen" for app icon',
    emptyLine1:'No goals yet.',emptyLine2:'Tap + to get started.',
    noEntry:'No entries yet',log:'Log',
    noch:'Left',dAbbr:'d',endet:'ends',todayShort:'today',total:'total',
    todayHeading:'Today',done2:'Done',dailyGoal:'Daily goal',remaining:'Left',
    history:'History — today & yesterday editable',
    legBuf:'Buffer',legDone:'Reached',legPartial:'Partial',legMissed:'Missed',
    delGoal:'Delete goal',
    qbLabel:'Quick-log',openLabel:'Open',doneToday:'Done today',
    hello:'Hello {n}!',
    confirmDelete:'Really delete this goal?',errDelete:'Delete failed',errSave:'Save failed',
    loginTitle:'Sign in',emailLabel:'E-Mail',passwordLabel:'Password',loginBtn:'Sign in',
    forgotPw:'Forgot password?',
    loginErrEmpty:'Please enter email and password',
    loginErrWrong:'Wrong email or password',loginErrRate:'Too many attempts',loginErrConn:'Connection error',
    forgotTitle:'Forgot password',forgotSub:"We'll send you a reset link",
    sendLink:'Send link',back:'Back',
    emailSentTitle:'Email sent',
    emailSentSub:"If the address is registered, you'll receive a reset link shortly.",
    ok:'OK',
    resetTitle:'New password',newPwLabel:'New password',setPw:'Set password',min8:'at least 8 characters',
    pwChangedTitle:'Password changed',pwChangedSub:'You can now sign in.',
    changeNameTitle:'Change name',yourName:'Your name',save:'Save',cancel:'Cancel',
    errNameEmpty:'Name cannot be empty',errNameSave:'Save failed',nameSaved:'Name saved',
    changePwTitle:'Change password',currentPwLabel:'Current password',
    newPwConfLabel:'Confirm new password',changePwBtn:'Change',
    errPwMismatch:"The new passwords don't match",pwChanged:'Password changed',
    registerTitle:'Create account',registerSub:"You've been invited",
    namePlaceholder:'What should we call you?',pwConfLabel:'Confirm password',
    pwPlaceholder:'Repeat password',registerBtn:'Register',
    errPwMismatch2:"Passwords don't match",errFillAll:'Please fill in all fields',
    newGoalTitle:'New goal',exerciseLabel:'Exercise / Habit',exercisePlaceholder:'Push-ups, Plank …',
    unitLabel:'Unit',unitDefault:'reps',daysLabel:'Duration (days)',
    dailyLabel:'Daily goal',weeklyLabel:'Weekly goal',startGoal:'Start goal',errCreate:'Create failed',
    dataMenuTitle:'Manage data',dataMenuSub:'Export, Import and Backup',
    exportLabel:'Export',exportSub:'Save all goals as JSON file',
    importLabel:'Import',importSub:'Load or merge backup',
    inviteLabel:'Invite friend',inviteSub:'Generate invite link',
    inviteListLabel:'My invitations',inviteListSub:'Status of all sent invitations',
    changeName:'Change name',changePw:'Change password',logout:'Sign out',close:'Close',
    clearAll:'Delete all data',clearAllSub:'Cannot be undone',
    confirmClear:'Delete all data?',
    inviteFormTitle:'Invite friend',inviteFormSub:'Link valid 7 days, single use',
    inviteNameLabel:'Name (for your reference)',inviteNamePlaceholder:'e.g. Max',
    generateLink:'Generate link',inviteLinkTitle:'Invite link',
    copyLink:'Copy link',linkCopied:'Link copied!',errGenerate:'Generate failed',
    noInvites:'No invitations sent yet',
    statusPending:'Pending',statusUsed:'Accepted',statusExpired:'Expired',
    errLoad:'Load failed',
    confirmImport:'Import {n} goal(s)?',importDone:'{n} goal(s) imported.',invalidFormat:'Invalid format',
    linkLabel:'Link',doneLabel:'done',ofLabel:'of',
    gestern:'Yesterday',heute:'Today',
    expiresAt:'expires:',acceptedBy:'→',
    adminLabel:'Users',adminColName:'Name',adminColEmail:'Email',adminColRegistered:'Registered',
  },
  pl: {
    hint:'Menu → "Dodaj do ekranu głównego" aby zainstalować',
    emptyLine1:'Brak celów.',emptyLine2:'Dotknij +, aby zacząć.',
    noEntry:'Brak wpisów',log:'Zapisz',
    noch:'Jeszcze',dAbbr:'d',endet:'kończy',todayShort:'dziś',total:'łącznie',
    todayHeading:'Dziś',done2:'Wykonano',dailyGoal:'Cel dzienny',remaining:'Pozostało',
    history:'Historia — dziś i wczoraj edytowalne',
    legBuf:'Zapas',legDone:'Osiągnięto',legPartial:'Częściowo',legMissed:'Pominięto',
    delGoal:'Usuń cel',
    qbLabel:'Szybki wpis',openLabel:'Otwarte',doneToday:'Dziś ukończone',
    hello:'Cześć {n}!',
    confirmDelete:'Na pewno usunąć cel?',errDelete:'Błąd podczas usuwania',errSave:'Błąd zapisu',
    loginTitle:'Zaloguj się',emailLabel:'E-Mail',passwordLabel:'Hasło',loginBtn:'Zaloguj',
    forgotPw:'Zapomniałeś hasła?',
    loginErrEmpty:'Podaj e-mail i hasło',
    loginErrWrong:'Błędny e-mail lub hasło',loginErrRate:'Zbyt wiele prób',loginErrConn:'Błąd połączenia',
    forgotTitle:'Zapomniane hasło',forgotSub:'Wyślemy Ci link do resetu',
    sendLink:'Wyślij link',back:'Wróć',
    emailSentTitle:'E-mail wysłany',
    emailSentSub:'Jeśli adres jest zarejestrowany, wkrótce otrzymasz link resetujący.',
    ok:'OK',
    resetTitle:'Nowe hasło',newPwLabel:'Nowe hasło',setPw:'Ustaw hasło',min8:'min. 8 znaków',
    pwChangedTitle:'Hasło zmienione',pwChangedSub:'Możesz się teraz zalogować.',
    changeNameTitle:'Zmień nazwę',yourName:'Twoje imię',save:'Zapisz',cancel:'Anuluj',
    errNameEmpty:'Imię nie może być puste',errNameSave:'Błąd zapisu',nameSaved:'Imię zapisano',
    changePwTitle:'Zmień hasło',currentPwLabel:'Aktualne hasło',
    newPwConfLabel:'Potwierdź nowe hasło',changePwBtn:'Zmień',
    errPwMismatch:'Nowe hasła się nie zgadzają',pwChanged:'Hasło zmienione',
    registerTitle:'Utwórz konto',registerSub:'Zostałeś zaproszony',
    namePlaceholder:'Jak mamy Cię nazywać?',pwConfLabel:'Potwierdź hasło',
    pwPlaceholder:'Powtórz hasło',registerBtn:'Zarejestruj',
    errPwMismatch2:'Hasła się nie zgadzają',errFillAll:'Wypełnij wszystkie pola',
    newGoalTitle:'Nowy cel',exerciseLabel:'Ćwiczenie / Nawyk',exercisePlaceholder:'Pompki, Plank …',
    unitLabel:'Jednostka',unitDefault:'szt.',daysLabel:'Czas trwania (dni)',
    dailyLabel:'Cel dzienny',weeklyLabel:'Cel tygodniowy',startGoal:'Rozpocznij cel',errCreate:'Błąd tworzenia',
    dataMenuTitle:'Zarządzaj danymi',dataMenuSub:'Eksport, import i kopia zapasowa',
    exportLabel:'Eksportuj',exportSub:'Zapisz wszystkie cele jako plik JSON',
    importLabel:'Importuj',importSub:'Załaduj lub połącz kopię zapasową',
    inviteLabel:'Zaproś znajomego',inviteSub:'Wygeneruj link zaproszenia',
    inviteListLabel:'Moje zaproszenia',inviteListSub:'Status wszystkich wysłanych zaproszeń',
    changeName:'Zmień nazwę',changePw:'Zmień hasło',logout:'Wyloguj',close:'Zamknij',
    clearAll:'Usuń wszystkie dane',clearAllSub:'Nie można cofnąć',
    confirmClear:'Usunąć wszystkie dane?',
    inviteFormTitle:'Zaproś znajomego',inviteFormSub:'Link ważny 7 dni, jednorazowy',
    inviteNameLabel:'Nazwa (dla Twojej ewidencji)',inviteNamePlaceholder:'np. Max',
    generateLink:'Wygeneruj link',inviteLinkTitle:'Link zaproszenia',
    copyLink:'Kopiuj link',linkCopied:'Link skopiowany!',errGenerate:'Błąd generowania',
    noInvites:'Brak wysłanych zaproszeń',
    statusPending:'Oczekujący',statusUsed:'Zaakceptowany',statusExpired:'Wygasły',
    errLoad:'Błąd ładowania',
    confirmImport:'Importować {n} cel(e)?',importDone:'Zaimportowano {n} cel(e).',invalidFormat:'Nieprawidłowy format',
    linkLabel:'Link',doneLabel:'wykonano',ofLabel:'z',
    gestern:'Wczoraj',heute:'Dziś',
    expiresAt:'wygasa:',acceptedBy:'→',
    adminLabel:'Użytkownicy',adminColName:'Nazwa',adminColEmail:'E-mail',adminColRegistered:'Rejestracja',
  }
};

var LOCALE = 'de';

function tr(key){ return (STRINGS[LOCALE]||STRINGS.de)[key]||STRINGS.de[key]||key; }
function ldoc(){ return LOCALE==='de'?'de-DE':LOCALE==='pl'?'pl-PL':'en-GB'; }

function setLocale(lang, save){
  LOCALE = lang;
  if(save){
    api('PATCH','me',{locale:lang}).catch(function(){});
    localStorage.setItem('zt_locale',lang);
  }
  render(); updateHeader();
}

function loadPref(k,def){ try{ return JSON.parse(localStorage.getItem(k)||def); }catch(e){ return JSON.parse(def); } }
function saveP(){ localStorage.setItem('zt_p',JSON.stringify(prefs)); }
prefs = loadPref('zt_p','{}');

function tOff(g){ return Math.round((TODAY - new Date(g.start))/86400000); }
function o2d(g,i){ var d=new Date(new Date(g.start).getTime()+i*86400000); d.setHours(0,0,0,0); return d; }
function dTot(g,o){ return (g.sets[String(o)]||[]).reduce(function(a,b){return a+b.amount;},0); }
function fd(d){ return d.toLocaleDateString(ldoc(),{weekday:'short',day:'numeric',month:'short'}); }
function fs(d){ return d.toLocaleDateString(ldoc(),{day:'numeric',month:'short'}); }
function editable(g,o){ var t=tOff(g); return o===t||o===t-1; }
function now(){ var n=new Date(); return String(n.getHours()).padStart(2,'0')+':'+String(n.getMinutes()).padStart(2,'0'); }

function heuteColor(tdone,daily){
  if(tdone===0) return 'var(--red)';
  if(tdone>=daily*1.1) return 'var(--blue)';
  if(tdone>=daily) return 'var(--green)';
  return 'var(--amber)';
}

function isCollapsed(id){ return collapsed[id]!==false; }
function toggleCollapse(id){
  var wasCollapsed=isCollapsed(id);
  collapsed[id]=!wasCollapsed;
  if(wasCollapsed){
    var g=goals.filter(function(x){return x.id===id;})[0];
    if(g) selDay[id]=tOff(g);
  }
  render();
}

function calc(g){
  var t=tOff(g), tot=g.daily*g.days;
  var dr=Math.max(0,g.days-t-1);
  var sd=new Date(g.start); sd.setHours(0,0,0,0);
  var end=new Date(sd.getTime()+g.days*86400000);
  var past=0;
  for(var i=0;i<Math.min(t,g.days);i++) past+=dTot(g,i);
  var tdone=dTot(g,t), tot2=past+tdone;
  var dl=dr+1;
  var remaining=Math.max(0,tot-past);
  var pd=Math.ceil(remaining/Math.max(1,dl));
  var st=Math.max(0,pd-tdone);
  var expectedPast=Math.min(t,g.days)*g.daily;
  var buf=(past-expectedPast)+Math.max(0,tdone-g.daily);
  var deficit=Math.min(0,buf);
  var surplus=Math.max(0,buf);
  var dailyDelta=pd-g.daily;
  var pct=Math.min(100,Math.round((tot2/tot)*100));
  return{tot:tot,tOff:t,end:end,dr:dr,done:tot2,tdone:tdone,pd:pd,st:st,buf:buf,deficit:deficit,surplus:surplus,dailyDelta:dailyDelta,net:tdone-pd,pct:pct,ok:tdone>=pd};
}

function dcls(g,i){
  var t=tOff(g); if(i>t) return 'dot df';
  var v=dTot(g,i);
  var c=v===0?'dot dm':v>=g.daily*1.1?'dot db':v>=g.daily?'dot dd':'dot dp';
  return c+(editable(g,i)?' de':' dl');
}
function dlbl(g,i){
  var t=tOff(g); if(i>t) return String(i+1);
  var v=dTot(g,i);
  if(v===0) return '✕'; if(v>=g.daily*1.1) return '+'; if(v>=g.daily) return '✓';
  return Math.round(v/g.daily*100)+'%';
}

// ── API ──────────────────────────────────────────────────────────────────────

function api(method, path, body){
  var opts = {method:method, credentials:'include', headers:{'Content-Type':'application/json'}};
  if(body) opts.body = JSON.stringify(body);
  return fetch('api/' + path, opts).then(function(res){
    return res.json().then(function(data){
      if(!res.ok){ var e=new Error(data.error||'Fehler'); e.status=res.status; throw e; }
      return data;
    });
  });
}

function loadGoals(){
  return api('GET','goals').then(function(data){ return data; });
}

function saveGoal(g){
  api('PATCH','goals/'+g.id,{name:g.name,unit:g.unit,daily:g.daily,days:g.days,start:g.start,sets:g.sets})
    .catch(function(e){
      if(e.status===401){ showLogin(); }
      else showToast(tr('errSave'));
    });
}

// ── Toast ─────────────────────────────────────────────────────────────────────

function showToast(msg){
  var t=document.createElement('div'); t.className='toast'; t.textContent=msg;
  document.body.appendChild(t); setTimeout(function(){t.remove();},3000);
}

// ── Goal-Aktionen ─────────────────────────────────────────────────────────────

function addSet(gid,off){
  var g=goals.filter(function(x){return x.id===gid;})[0];
  if(!g||!editable(g,off)) return;
  var k=gid+'_'+off, amt=parseInt(addAmt[k]||'0',10);
  if(amt<=0) return;
  if(!g.sets[String(off)]) g.sets[String(off)]=[];
  g.sets[String(off)].push({amount:amt,time:off===tOff(g)?now():'—'});
  addAmt[k]=''; saveGoal(g); render();
}
function remSet(gid,off,idx){
  var g=goals.filter(function(x){return x.id===gid;})[0];
  if(!g||!editable(g,off)) return;
  g.sets[String(off)].splice(idx,1); saveGoal(g); render();
}
function delGoal(id){
  if(!confirm(tr('confirmDelete'))) return;
  goals=goals.filter(function(g){return g.id!==id;});
  render();
  api('DELETE','goals/'+id).catch(function(){ showToast(tr('errDelete')); });
}
function selD(gid,off){
  var g=goals.filter(function(x){return x.id===gid;})[0];
  if(!g||!editable(g,off)) return;
  selDay[gid]=selDay[gid]===off?null:off; render();
}
function startRen(id){
  var g=goals.filter(function(x){return x.id===id;})[0]; if(!g) return;
  renamingId=id; renameVal=g.name; render();
  setTimeout(function(){ var el=document.getElementById('ri'+id); if(el){el.focus();el.select();} },50);
}
function commitRen(id){
  var g=goals.filter(function(x){return x.id===id;})[0];
  if(g&&renameVal.trim()){g.name=renameVal.trim(); saveGoal(g);}
  renamingId=null; render();
}
function cancelRen(){ renamingId=null; render(); }

// ── Template-Helper ───────────────────────────────────────────────────────────

function tpl(id){
  var el=document.getElementById(id).content.cloneNode(true).firstElementChild;
  el.querySelectorAll('[data-t]').forEach(function(n){ n.textContent=tr(n.dataset.t); });
  el.querySelectorAll('[data-ph]').forEach(function(n){ n.placeholder=tr(n.dataset.ph); });
  el.querySelectorAll('[data-val]').forEach(function(n){ n.value=tr(n.dataset.val); });
  return el;
}

// ── Overlays ──────────────────────────────────────────────────────────────────

var OV_CSS='display:flex;position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.5);align-items:flex-end;justify-content:center;animation:fi .2s ease';

function closeOv(){
  var o=document.getElementById('ov');
  o.style.display='none';
  o.innerHTML='';
}

function showSheet(content, dismissable){
  var o=document.getElementById('ov');
  o.style.cssText=OV_CSS;
  var sheet=tpl('tpl-sheet');
  sheet.appendChild(content);
  o.innerHTML='';
  o.appendChild(sheet);
  o.onclick=dismissable!==false?function(e){if(e.target===o)closeOv();}:null;
}

// ── Login ─────────────────────────────────────────────────────────────────────

function showLogin(err){
  var c=tpl('tpl-login');
  if(err){ var e=c.querySelector('.login-err'); e.textContent=err; e.style.display=''; }
  showSheet(c,false);
  var email=c.querySelector('.lf-email'), pass=c.querySelector('.lf-pass'), sub=c.querySelector('.lf-sub');
  setTimeout(function(){email.focus();},50);
  email.onkeydown=function(e){if(e.key==='Enter')pass.focus();};
  pass.onkeydown=function(e){if(e.key==='Enter')sub.click();};
  c.querySelector('.lf-fgt').onclick=function(){showForgotPassword();};
  sub.onclick=function(){
    var ev=email.value.trim(), pv=pass.value;
    if(!ev||!pv){ var errEl=c.querySelector('.login-err'); errEl.textContent=tr('loginErrEmpty'); errEl.style.display=''; return; }
    sub.disabled=true; sub.textContent='…';
    api('POST','login',{email:ev,password:pv})
      .then(function(){ return loadGoals(); })
      .then(function(g){ goals=g; closeOv(); render(); })
      .catch(function(err){
        sub.disabled=false; sub.textContent=tr('loginBtn');
        showLogin(err.status===401?tr('loginErrWrong'):err.status===429?tr('loginErrRate'):tr('loginErrConn'));
      });
  };
}

// ── Passwort vergessen ────────────────────────────────────────────────────────

function showForgotPassword(){
  var c=tpl('tpl-forgot-pw');
  showSheet(c,false);
  var email=c.querySelector('.fp-email'), errEl=c.querySelector('.login-err'), sub=c.querySelector('.fp-sub');
  setTimeout(function(){email.focus();},50);
  c.querySelector('.fp-back').onclick=function(){showLogin();};
  sub.onclick=function(){
    var ev=email.value.trim(); if(!ev) return;
    sub.disabled=true; sub.textContent='…';
    api('POST','reset-request',{email:ev})
      .then(function(){
        var conf=tpl('tpl-email-sent');
        conf.querySelector('.es-ok').onclick=function(){showLogin();};
        showSheet(conf,false);
      })
      .catch(function(err){
        sub.disabled=false; sub.textContent=tr('sendLink');
        errEl.textContent=err.message||'Fehler'; errEl.style.display='';
      });
  };
}

// ── Passwort zurücksetzen ─────────────────────────────────────────────────────

function showResetPassword(selector,token){
  var c=tpl('tpl-reset-pw');
  showSheet(c,false);
  var pass=c.querySelector('.rp-pass'), errEl=c.querySelector('.login-err'), sub=c.querySelector('.rp-sub');
  setTimeout(function(){pass.focus();},50);
  sub.onclick=function(){
    var pv=pass.value; if(!pv) return;
    sub.disabled=true; sub.textContent='…';
    api('POST','reset-password',{selector:selector,token:token,password:pv})
      .then(function(){
        var conf=tpl('tpl-pw-changed');
        conf.querySelector('.pc-ok').onclick=function(){showLogin();};
        showSheet(conf,false);
      })
      .catch(function(err){
        sub.disabled=false; sub.textContent=tr('setPw');
        errEl.textContent=err.message||'Fehler'; errEl.style.display='';
      });
  };
}

// ── Passwort ändern ───────────────────────────────────────────────────────────

function showChangePassword(){
  var c=tpl('tpl-change-pw');
  showSheet(c,true);
  var oldP=c.querySelector('.cp-old'), newP=c.querySelector('.cp-new'), newP2=c.querySelector('.cp-new2');
  var errEl=c.querySelector('.login-err'), sub=c.querySelector('.cp-sub');
  setTimeout(function(){oldP.focus();},50);
  c.querySelector('.cp-can').onclick=closeOv;
  sub.onclick=function(){
    var o=oldP.value, n=newP.value, n2=newP2.value;
    if(!o||!n||!n2) return;
    if(n!==n2){ errEl.textContent=tr('errPwMismatch'); errEl.style.display=''; return; }
    sub.disabled=true; sub.textContent='…';
    api('POST','change-password',{old_password:o,new_password:n})
      .then(function(){ showToast(tr('pwChanged')); closeOv(); })
      .catch(function(err){
        sub.disabled=false; sub.textContent=tr('changePwBtn');
        errEl.textContent=err.message||'Fehler'; errEl.style.display='';
      });
  };
}

// ── Registrierung ─────────────────────────────────────────────────────────────

function showRegister(token){
  var c=tpl('tpl-register');
  showSheet(c,false);
  var nameInp=c.querySelector('.rg-name'), email=c.querySelector('.rg-email');
  var pass=c.querySelector('.rg-pass'), pass2=c.querySelector('.rg-pass2');
  var errEl=c.querySelector('.login-err'), sub=c.querySelector('.rg-sub');
  setTimeout(function(){nameInp.focus();},50);
  nameInp.onkeydown=function(e){if(e.key==='Enter')email.focus();};
  email.onkeydown=function(e){if(e.key==='Enter')pass.focus();};
  pass.onkeydown=function(e){if(e.key==='Enter')pass2.focus();};
  pass2.onkeydown=function(e){if(e.key==='Enter')sub.click();};
  function checkMatch(){ if(pass2.value&&pass.value!==pass2.value){ errEl.textContent=tr('errPwMismatch2'); errEl.style.display=''; } else { errEl.style.display='none'; } }
  pass.oninput=checkMatch; pass2.oninput=checkMatch;
  sub.onclick=function(){
    var nv=nameInp.value.trim(), ev=email.value.trim(), pv=pass.value;
    if(!nv||!ev||!pv){ errEl.textContent=tr('errFillAll'); errEl.style.display=''; return; }
    if(pv!==pass2.value){ errEl.textContent=tr('errPwMismatch2'); errEl.style.display=''; return; }
    sub.disabled=true; sub.textContent='…';
    api('POST','register',{name:nv,email:ev,password:pv,token:token})
      .then(function(r){ userName=r.name||''; return loadGoals(); })
      .then(function(g){ goals=g; closeOv(); updateHeader(); render(); })
      .catch(function(err){
        sub.disabled=false; sub.textContent=tr('registerBtn');
        errEl.textContent=err.message||'Fehler'; errEl.style.display='';
      });
  };
}

// ── Neues Ziel ────────────────────────────────────────────────────────────────

function openNew(){
  var c=tpl('tpl-new-goal');
  showSheet(c,true);
  var name=c.querySelector('.ng-name'), unit=c.querySelector('.ng-unit');
  var daily=c.querySelector('.ng-daily'), weekly=c.querySelector('.ng-weekly');
  var days=c.querySelector('.ng-days'), sub=c.querySelector('.ng-sub');
  daily.addEventListener('input',function(){
    if(daily.value) weekly.value=Math.round(parseFloat(daily.value)*7*100)/100;
  });
  weekly.addEventListener('input',function(){
    if(weekly.value) daily.value=Math.round(parseFloat(weekly.value)/7*100)/100;
  });
  setTimeout(function(){name.focus();},50);
  c.querySelector('.ng-can').onclick=closeOv;
  sub.onclick=function(){
    var nv=(name.value||'').trim(), uv=(unit.value||'').trim()||tr('unitDefault');
    var dv=parseFloat(daily.value)||1, dyv=parseInt(days.value,10)||30;
    if(!nv){ name.focus(); return; }
    sub.disabled=true;
    api('POST','goals',{name:nv,unit:uv,daily:dv,days:dyv,start:TODAY.toISOString()})
      .then(function(r){
        goals.push({id:r.id,name:r.name,unit:r.unit,daily:r.daily,days:r.days,start:r.start,sets:r.sets||{}});
        closeOv(); render();
      }).catch(function(e){
        sub.disabled=false;
        if(e.status===401){ closeOv(); showLogin(); }
        else showToast(tr('errCreate'));
      });
  };
}

// ── Daten-Menü ────────────────────────────────────────────────────────────────

function openData(){
  var c=tpl('tpl-data-menu');
  showSheet(c,true);
  c.querySelector('.dm-cls').onclick=closeOv;
  c.querySelector('.dm-name').onclick=function(){
    var nc=tpl('tpl-change-name');
    showSheet(nc,true);
    var inp=nc.querySelector('.cn-name'), errEl=nc.querySelector('.login-err'), sub=nc.querySelector('.cn-sub');
    inp.value=userName;
    setTimeout(function(){inp.focus();inp.select();},50);
    nc.querySelector('.cn-can').onclick=closeOv;
    sub.onclick=function(){
      var nv=inp.value.trim();
      if(!nv){ errEl.textContent=tr('errNameEmpty'); errEl.style.display=''; return; }
      sub.disabled=true; sub.textContent='…';
      api('PATCH','me',{name:nv})
        .then(function(r){ userName=r.name; closeOv(); render(); showToast(tr('nameSaved')); })
        .catch(function(){ sub.disabled=false; sub.textContent=tr('save'); showToast(tr('errNameSave')); });
    };
  };
  c.querySelector('.dm-cpw').onclick=function(){ closeOv(); showChangePassword(); };
  c.querySelector('.dm-lgout').onclick=function(){
    api('POST','logout').then(function(){ goals=[]; closeOv(); render(); showLogin(); });
  };

  var adminBtn=c.querySelector('.dm-admin');
  if(isAdmin){ adminBtn.style.display=''; adminBtn.onclick=function(){ closeOv(); openAdmin(); }; }

  c.querySelector('.dm-inv').onclick=function(){
    var ic=tpl('tpl-invite-form');
    showSheet(ic,true);
    var invName=ic.querySelector('.inv-name');
    setTimeout(function(){invName.focus();},50);
    ic.querySelector('.inv-cancel').onclick=closeOv;
    ic.querySelector('.inv-gen').onclick=function(){
      var note=invName.value.trim(), btn=this;
      btn.disabled=true; btn.textContent='…';
      api('POST','invite',{note:note}).then(function(res){
        var lc=tpl('tpl-invite-link');
        lc.querySelector('.stitle').textContent=tr('inviteLinkTitle')+(note?' — '+note:'');
        var urlInp=lc.querySelector('.il-url');
        urlInp.value=res.url;
        showSheet(lc,true);
        lc.querySelector('.il-close').onclick=closeOv;
        lc.querySelector('.il-copy').onclick=function(){
          navigator.clipboard.writeText(res.url).then(function(){ showToast(tr('linkCopied')); closeOv(); });
        };
        setTimeout(function(){urlInp.select();},50);
      }).catch(function(){
        btn.disabled=false; btn.textContent=tr('generateLink');
        showToast(tr('errGenerate'));
      });
    };
  };

  c.querySelector('.dm-invlist').onclick=function(){
    api('GET','invites').then(function(list){
      var statusLabel={'pending':tr('statusPending'),'used':tr('statusUsed'),'expired':tr('statusExpired')};
      var statusColor={'pending':'var(--amber)','used':'var(--green)','expired':'var(--red)'};
      var lc=tpl('tpl-invite-list');
      var body=lc.querySelector('.dpanel-body');
      if(!list.length){
        var empty=document.createElement('div');
        empty.className='nosets'; empty.style.padding='16px';
        empty.textContent=tr('noInvites');
        body.appendChild(empty);
      } else {
        for(var i=0;i<list.length;i++){
          var inv=list[i];
          var label=inv.note||new Date(inv.created_at).toLocaleDateString(ldoc(),{day:'numeric',month:'short',year:'numeric'});
          var detail=inv.used_by_email?(tr('acceptedBy')+' '+inv.used_by_email):(inv.status==='pending'?tr('expiresAt')+' '+new Date(inv.expires_at).toLocaleDateString(ldoc(),{day:'numeric',month:'short'}):'');
          var row=tpl('tpl-invite-row');
          row.querySelector('.ir-label').textContent=label;
          if(detail) row.querySelector('.ir-detail').textContent=' '+detail;
          var st=row.querySelector('.ir-status');
          st.textContent=statusLabel[inv.status]; st.style.color=statusColor[inv.status];
          if(inv.url){
            var cp=row.querySelector('.ir-copy'); cp.style.display='';
            cp.onclick=function(url){ return function(){ navigator.clipboard.writeText(url).then(function(){ showToast(tr('linkCopied')); }); }; }(inv.url);
          }
          body.appendChild(row);
        }
      }
      showSheet(lc,true);
      lc.querySelector('.il-close').onclick=closeOv;
    }).catch(function(){ showToast(tr('errLoad')); });
  };

  c.querySelector('.dm-exp').onclick=function(){
    var blob=new Blob([JSON.stringify({goals:goals,at:new Date().toISOString()},null,2)],{type:'application/json'});
    var url=URL.createObjectURL(blob), a=document.createElement('a');
    a.href=url; a.download='dudi-backup.json'; a.click(); URL.revokeObjectURL(url); closeOv();
  };

  c.querySelector('.dm-imp').onclick=function(){
    var inp=document.createElement('input'); inp.type='file'; inp.accept='.json';
    inp.onchange=function(e){
      var f=e.target.files[0]; if(!f) return;
      var r=new FileReader(); r.onload=function(ev){
        try{
          var p=JSON.parse(ev.target.result);
          if(!p.goals||!Array.isArray(p.goals)) throw new Error(tr('invalidFormat'));
          if(!confirm(tr('confirmImport').replace('{n}',p.goals.length))) return;
          var promises=p.goals.map(function(g){
            return api('POST','goals',{name:g.name,unit:g.unit,daily:g.daily,days:g.days,start:g.start,sets:g.sets||{}})
              .then(function(r){ goals.push({id:r.id,name:r.name,unit:r.unit,daily:r.daily,days:r.days,start:r.start,sets:r.sets||{}}); });
          });
          Promise.all(promises).then(function(){ closeOv(); render(); alert(tr('importDone').replace('{n}',p.goals.length)); });
        }catch(err){ alert(err.message); }
      }; r.readAsText(f);
    }; inp.click();
  };

  c.querySelectorAll('.btn-lang').forEach(function(b){
    if(b.dataset.lang===LOCALE) b.classList.add('active');
    b.onclick=function(){ setLocale(this.dataset.lang,true); closeOv(); };
  });

  c.querySelector('.dm-clr').onclick=function(){
    if(!confirm(tr('confirmClear'))) return;
    var ids=goals.map(function(g){return g.id;}); goals=[]; render();
    Promise.all(ids.map(function(id){return api('DELETE','goals/'+id);}))
      .catch(function(){ showToast(tr('errDelete')); });
    closeOv();
  };
}

// ── Admin ─────────────────────────────────────────────────────────────────────

function openAdmin(){
  api('GET','admin/users').then(function(rows){
    var c=tpl('tpl-admin-users');
    var body=c.querySelector('.au-body');
    rows.forEach(function(u){
      var row=document.createElement('tr');
      row.style.borderBottom='1px solid var(--border)';
      var name=u.username||'—';
      var date=new Date(u.registered*1000).toLocaleDateString(ldoc(),{day:'numeric',month:'short',year:'numeric'});
      row.innerHTML='<td style="padding:7px 12px">'+escHtml(name)+'</td>'
                   +'<td style="padding:7px 12px;color:var(--text2)">'+escHtml(u.email)+'</td>'
                   +'<td style="padding:7px 12px;color:var(--text2);font-size:.85em">'+date+'</td>';
      body.appendChild(row);
    });
    showSheet(c,true);
    c.querySelector('.au-close').onclick=closeOv;
  }).catch(function(){ showToast(tr('errLoad')); });
}

function escHtml(s){ return String(s).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;'); }

// ── Card-Bausteine ────────────────────────────────────────────────────────────

function buildNameWrap(g){
  if(renamingId===g.id){
    var el=tpl('tpl-name-edit');
    var inp=el.querySelector('.ren-input');
    inp.id='ri'+g.id; inp.value=g.name; inp.dataset.g=g.id;
    return el;
  }
  var el=tpl('tpl-name-view');
  el.querySelector('.goal-name').textContent=g.name;
  el.querySelector('.btn-ren').dataset.g=g.id;
  return el;
}

function buildPanel(g,off){
  var t=tOff(g), sets=g.sets[String(off)]||[], tot=dTot(g,off);
  var lbl=off===t?tr('heute'):tr('gestern'), k=g.id+'_'+off;
  var el=tpl('tpl-panel');
  el.querySelector('.dpanel-title').textContent=lbl+' — '+fd(o2d(g,off));
  el.querySelector('.dpanel-sub').textContent=tot+' / '+g.daily+' '+g.unit;
  var body=el.querySelector('.dpanel-body');
  if(sets.length){
    for(var i=0;i<sets.length;i++){
      var s=sets[i], row=tpl('tpl-set-row'), span=row.querySelector('span');
      if(s.time!=='—'){
        var st=document.createElement('span'); st.className='stime'; st.textContent=s.time+' ·';
        span.appendChild(st); span.appendChild(document.createTextNode(' '));
      }
      var strong=document.createElement('strong'); strong.textContent=s.amount;
      span.appendChild(strong); span.appendChild(document.createTextNode(' '+g.unit));
      var btn=row.querySelector('.sdel');
      btn.dataset.g=g.id; btn.dataset.o=off; btn.dataset.i=i;
      body.appendChild(row);
    }
  } else {
    body.appendChild(tpl('tpl-nosets'));
  }
  var addRow=tpl('tpl-add-row');
  var inp=addRow.querySelector('.num-in');
  inp.placeholder=g.daily; inp.value=addAmt[k]||''; inp.dataset.k=k; inp.dataset.g=g.id; inp.dataset.o=off;
  var abtn=addRow.querySelector('.btn-as');
  abtn.dataset.g=g.id; abtn.dataset.o=off;
  addRow.querySelector('.ulbl').textContent=g.unit;
  body.appendChild(addRow);
  return el;
}

function buildCard(g){
  var c=calc(g), t=c.tOff;
  var fc=c.surplus>0?'var(--blue)':c.st===0?'var(--green)':c.dailyDelta<=0?'var(--green)':c.dailyDelta<=g.daily*.2?'var(--amber)':'var(--red)';
  var bc,bt,bufStr=(c.buf>0?'+':'')+c.buf;
  if(c.ok&&c.surplus>0){bc='b-buf';bt=bufStr;}
  else if(c.ok){bc='b-done';bt=bufStr;}
  else if(c.dailyDelta<=0){bc='b-ok';bt=bufStr;}
  else if(c.dailyDelta<=g.daily*.2){bc='b-warn';bt=bufStr;}
  else{bc='b-danger';bt=bufStr;}

  var el;
  if(isCollapsed(g.id)){
    el=tpl('tpl-card-collapsed');
    if(c.ok) el.classList.add('done');
    el.querySelector('.card-hdr').dataset.g=g.id;
    var bd=el.querySelector('.card-bd');
    bd.insertBefore(buildNameWrap(g),bd.firstElementChild);
    var hc=heuteColor(c.tdone,g.daily);
    el.querySelector('.m-dr').textContent=c.dr;
    el.querySelector('.m-end').textContent=fs(c.end);
    var mH=el.querySelector('.m-heute'); mH.textContent=c.tdone+'/'+g.daily; mH.style.color=hc;
    el.querySelector('.m-total').textContent=c.done+'/'+c.tot;
    var badge=el.querySelector('.badge'); badge.className='badge '+bc; badge.textContent=bt;
    var fill=el.querySelector('.prog-fill'); fill.style.width=c.pct+'%'; fill.style.background=fc;
    return el;
  }

  el=tpl('tpl-card-expanded');
  if(c.ok) el.classList.add('done');
  el.querySelector('.card-hdr').dataset.g=g.id;
  var bd=el.querySelector('.card-bd');
  bd.insertBefore(buildNameWrap(g),bd.firstElementChild);
  el.querySelector('.m-dr').textContent=c.dr;
  el.querySelector('.m-end').textContent=fs(c.end);
  var badge=el.querySelector('.badge'); badge.className='badge '+bc; badge.textContent=bt;
  var fill=el.querySelector('.prog-fill'); fill.style.width=c.pct+'%'; fill.style.background=fc;
  el.querySelector('.pr-done').textContent=c.done+' '+g.unit+' '+tr('doneLabel');
  el.querySelector('.pr-pct').textContent=c.pct+'% '+tr('ofLabel')+' '+c.tot;
  el.querySelector('.sv-tdone').textContent=c.tdone;
  el.querySelector('.sv-daily').textContent=g.daily;
  el.querySelector('.sv-st').textContent=c.st;
  el.querySelector('.sv-noch').style.color=heuteColor(c.tdone,g.daily);
  el.querySelectorAll('.sunit').forEach(function(u){ u.textContent=g.unit; });

  var sel=selDay[g.id]!=null?selDay[g.id]:t;
  var dotsWrap=el.querySelector('.dots-wrap');
  for(var i=0;i<g.days;i++){
    var it=i===t, iy=i===t-1, is=sel===i, ed=editable(g,i);
    var dot=tpl('tpl-dot');
    dot.className=dcls(g,i)+(is?' rs':it?' rt':iy&&t>0?' ry':'');
    if(ed){ dot.dataset.g=g.id; dot.dataset.d=i; }
    dot.textContent=dlbl(g,i);
    dotsWrap.appendChild(dot);
  }

  if(sel!=null) el.insertBefore(buildPanel(g,sel),el.querySelector('.card-foot'));
  el.querySelector('.btn-del').dataset.g=g.id;
  return el;
}

// ── Quick-Buchen ──────────────────────────────────────────────────────────────

function buildQuickBook(){
  var active=goals.filter(function(g){ var c=calc(g); return tOff(g)<g.days&&!c.ok; });
  if(!active.length) return null;
  var frag=document.createDocumentFragment();
  var lbl=document.createElement('div'); lbl.className='sec-lbl'; lbl.textContent=tr('qbLabel');
  frag.appendChild(lbl);
  var card=document.createElement('div'); card.className='card qb-card';
  for(var i=0;i<active.length;i++){
    var g=active[i], c=calc(g), k=g.id+'_'+c.tOff;
    var row=tpl('tpl-qb-row');
    row.querySelector('.qb-name').textContent=g.name;
    var stat=row.querySelector('.qb-stat'); stat.textContent=c.tdone+'/'+g.daily; stat.style.color=heuteColor(c.tdone,g.daily);
    var inp=row.querySelector('.num-in');
    inp.placeholder=g.daily; inp.value=addAmt[k]||''; inp.dataset.k=k; inp.dataset.g=g.id; inp.dataset.o=c.tOff;
    var btn=row.querySelector('.btn-as'); btn.dataset.g=g.id; btn.dataset.o=c.tOff;
    card.appendChild(row);
  }
  frag.appendChild(card);
  return frag;
}

// ── Render ────────────────────────────────────────────────────────────────────

function calcAwards(){
  var units=0;
  for(var i=0;i<goals.length;i++){
    var g=goals[i];
    if(tOff(g)>=g.days) units+=Math.floor(g.days/30);
  }
  var gold=Math.floor(units/25); units%=25;
  var silver=Math.floor(units/5); var bronze=units%5;
  return{gold:gold,silver:silver,bronze:bronze};
}

function render(){
  var m=document.getElementById('main');
  var frag=document.createDocumentFragment();

  if(!prefs.hd){
    var hint=tpl('tpl-hint');
    hint.querySelector('.hclose').onclick=function(){ prefs.hd=1; saveP(); hint.remove(); };
    frag.appendChild(hint);
  }

  var aw=calcAwards();
  if(aw.gold||aw.silver||aw.bronze){
    var awards=document.createElement('div'); awards.className='awards';
    var medals=[['🥇',aw.gold],['🥈',aw.silver],['🥉',aw.bronze]];
    for(var mi=0;mi<medals.length;mi++){
      for(var ai=0;ai<medals[mi][1];ai++){
        var sp=document.createElement('span'); sp.className='aw'; sp.textContent=medals[mi][0];
        awards.appendChild(sp);
      }
    }
    frag.appendChild(awards);
  }

  if(!goals.length){
    frag.appendChild(tpl('tpl-empty'));
    m.innerHTML=''; m.appendChild(frag); wire(); return;
  }

  if(userName){
    var gr=document.createElement('div'); gr.className='greeting'; gr.textContent=tr('hello').replace('{n}',userName);
    frag.appendChild(gr);
  }

  var qb=buildQuickBook(); if(qb) frag.appendChild(qb);

  var open=[],done=[];
  for(var gi=0;gi<goals.length;gi++){
    var g=goals[gi], c=calc(g);
    if(c.ok) done.push(g); else open.push(g);
  }
  if(open.length){
    var sl=document.createElement('div'); sl.className='sec-lbl'; sl.textContent=tr('openLabel');
    frag.appendChild(sl);
    for(var i=0;i<open.length;i++) frag.appendChild(buildCard(open[i]));
  }
  if(done.length){
    var sl2=document.createElement('div'); sl2.className='sec-lbl'; sl2.textContent=tr('doneToday');
    frag.appendChild(sl2);
    for(var j=0;j<done.length;j++) frag.appendChild(buildCard(done[j]));
  }

  m.innerHTML=''; m.appendChild(frag); wire();
}

function wire(){
  document.querySelectorAll('.card-hdr[data-g]').forEach(function(el){
    el.onclick=function(e){
      if(e.target.classList.contains('btn-ren')||e.target.classList.contains('ren-input')) return;
      toggleCollapse(this.dataset.g);
    };
  });
  document.querySelectorAll('.btn-ren').forEach(function(b){
    b.onclick=function(e){e.stopPropagation();startRen(this.dataset.g);};
  });
  document.querySelectorAll('.ren-input').forEach(function(inp){
    var gid=inp.dataset.g;
    inp.oninput=function(){renameVal=this.value;};
    inp.onkeydown=function(e){if(e.key==='Enter')commitRen(gid);if(e.key==='Escape')cancelRen();};
    inp.onblur=function(){commitRen(gid);};
  });
  document.querySelectorAll('.de').forEach(function(d){
    d.onclick=function(e){e.stopPropagation();selD(this.dataset.g,parseInt(this.dataset.d,10));};
  });
  document.querySelectorAll('.btn-as').forEach(function(b){
    b.onclick=function(){addSet(this.dataset.g,parseInt(this.dataset.o,10));};
  });
  document.querySelectorAll('.num-in').forEach(function(inp){
    var k=inp.dataset.k, g=inp.dataset.g, o=parseInt(inp.dataset.o,10);
    inp.oninput=function(){addAmt[k]=this.value;};
    inp.onkeydown=function(e){if(e.key==='Enter')addSet(g,o);};
  });
  document.querySelectorAll('.sdel').forEach(function(b){
    b.onclick=function(){remSet(this.dataset.g,parseInt(this.dataset.o,10),parseInt(this.dataset.i,10));};
  });
  document.querySelectorAll('.btn-del').forEach(function(b){
    b.onclick=function(){delGoal(this.dataset.g);};
  });
}

// ── Start ─────────────────────────────────────────────────────────────────────

function updateHeader(){
  document.getElementById('tlbl').textContent=TODAY.toLocaleDateString(ldoc(),{weekday:'long',day:'numeric',month:'long'});
}

document.getElementById('btnNew').onclick=openNew;
document.getElementById('btnData').onclick=openData;
updateHeader();

var _qs=new URLSearchParams(window.location.search);
var inviteToken=_qs.get('invite');
var resetSelector=_qs.get('reset_selector');
var resetToken=_qs.get('reset_token');
if(inviteToken||resetSelector) history.replaceState(null,'',location.pathname);

function applyLocale(userLocale){
  var lang = userLocale || localStorage.getItem('zt_locale');
  if(!lang){
    var nav = (navigator.language||'').slice(0,2).toLowerCase();
    if(STRINGS[nav]) lang = nav;
  }
  if(lang && STRINGS[lang]) LOCALE = lang;
}

if(resetSelector&&resetToken){
  applyLocale(null); render(); showResetPassword(resetSelector,resetToken);
} else {
  api('GET','me')
    .then(function(r){ userName=r.name||''; isAdmin=r.is_admin||false; applyLocale(r.locale); updateHeader(); return loadGoals(); })
    .then(function(g){ goals=g; render(); })
    .catch(function(){
      applyLocale(null); render();
      if(inviteToken){ showRegister(inviteToken); }
      else { showLogin(); }
    });
}

function scheduleMidnight(){
  var n=new Date();
  var ms=new Date(n.getFullYear(),n.getMonth(),n.getDate()+1,0,0,5).getTime()-n.getTime();
  setTimeout(function(){
    TODAY=new Date();TODAY.setHours(0,0,0,0);selDay={};collapsed={};
    updateHeader();render();scheduleMidnight();
  },ms);
}
scheduleMidnight();

document.addEventListener('visibilitychange',function(){
  if(document.visibilityState==='visible'){
    var n=new Date();n.setHours(0,0,0,0);
    if(n.getTime()!==TODAY.getTime()){TODAY=n;selDay={};collapsed={};render();scheduleMidnight();}
    loadGoals().then(function(g){goals=g;render();}).catch(function(){});
  }
});

var sw = (function(){
  var swEl = document.getElementById('sw');
  var state = 0; // 0=stopped, 1=running, 2=paused
  var start = 0, elapsed = 0, raf = null;

  function getMs(){ return state === 1 ? elapsed + (Date.now() - start) : elapsed; }

  function updateFillBtns(){
    var show = getMs() >= 1000;
    document.querySelectorAll('.btn-sw-fill').forEach(function(b){ b.style.display = show ? '' : 'none'; });
  }

  function fmt(ms){ return (ms / 1000).toFixed(2) + 's'; }

  function tick(){
    swEl.textContent = fmt(Date.now() - start + elapsed);
    updateFillBtns();
    raf = requestAnimationFrame(tick);
  }

  swEl.addEventListener('click', function(){
    if(state === 0){
      start = Date.now(); elapsed = 0;
      swEl.classList.add('running');
      state = 1; tick();
    } else if(state === 1){
      cancelAnimationFrame(raf);
      elapsed += Date.now() - start;
      swEl.textContent = fmt(elapsed);
      swEl.classList.remove('running');
      state = 2; updateFillBtns();
    } else {
      cancelAnimationFrame(raf);
      elapsed = 0; swEl.textContent = '0.00s';
      swEl.classList.remove('running');
      state = 0; updateFillBtns();
    }
  });

  document.addEventListener('click', function(e){
    if(!e.target.classList.contains('btn-sw-fill')) return;
    var inp = e.target.closest('.add-row, .qb-row').querySelector('.num-in');
    if(inp) inp.value = Math.floor(getMs() / 1000);
  });

  return { getMs: getMs };
})();