/* widget: zinsbouwer met aanpasbare woordbanken */
function mountSentence(root, initState){
  const year=learningYearGroup(initState?.yearGroup);
  const early=year&&year<=3,advanced=year&&year>=7;
  const defaults=LANG==='nl' ? (early ? {
    who:['De hond','Ik','Sam','De juf'],does:['leest','speelt','maakt','ziet'],what:['een boek','buiten','een huis','de bal'],
  } : advanced ? {
    who:['Hoewel de bron','De schrijver','Onze klas','Volgens de onderzoeker'],does:['vergelijkt','beargumenteert','verklaart','beoordeelt'],what:['de informatie kritisch','twee standpunten','de uitkomst zorgvuldig','het bewijs in de tekst'],
  } : {
    who:['De hond','Mijn vriend','De juf','Sara'], does:['lees','speelt','maakt','ziet'],
    what:['een boek','op het plein','een mooie tekening','de rode bal'],
  }) : (early ? {
    who:['The dog','I','Sam','The teacher'],does:['reads','plays','makes','sees'],what:['a book','outside','a house','the ball'],
  } : advanced ? {
    who:['Although the source','The writer','Our class','According to the researcher'],does:['compares','argues','explains','assesses'],what:['the information critically','two viewpoints','the result carefully','the evidence in the text'],
  } : {
    who:['The dog','My friend','The teacher','Sarah'], does:['reads','plays','makes','sees'],
    what:['a book','in the playground','a beautiful drawing','the red ball'],
  });
  const legacyNl={who:['De hond','Mijn vriend','De juf','Sara'],does:['lees','speelt','maakt','ziet'],what:['een boek','op het plein','een mooie tekening','de rode bal']};
  const legacyEn={who:['The dog','My friend','The teacher','Sarah'],does:['reads','plays','makes','sees'],what:['a book','in the playground','a beautiful drawing','the red ball']};
  const savedBanks=initState?.banks,isLegacyDefault=savedBanks&&[legacyNl,legacyEn].some(bank=>JSON.stringify(bank)===JSON.stringify(savedBanks));
  const chosenBanks=initState?.managedLearningLevel&&isLegacyDefault?defaults:(savedBanks||defaults);
  const S={banks:JSON.parse(JSON.stringify(chosenBanks)),sentence:[...(initState?.sentence||[])]};
  root.innerHTML=`
    <div class="sb">
      <div class="sb-sentence" aria-live="polite"></div>
      <div class="sb-banks"></div>
      <div class="sb-add">
        <select class="sb-kind"><option value="who"></option><option value="does"></option><option value="what"></option></select>
        <input class="sb-word" type="text" maxlength="40">
        <button class="tbtn ghost sb-add-btn" type="button">＋</button>
      </div>
      <div class="sb-actions"><button class="tbtn ghost sb-surprise" type="button"></button><button class="tbtn ghost sb-back" type="button">↶</button><button class="tbtn ghost sb-clear" type="button"></button><button class="tbtn sb-speak" type="button"></button></div>
    </div>`;
  const q=s=>root.querySelector(s), sentenceEl=q('.sb-sentence'), banksEl=q('.sb-banks'), kind=q('.sb-kind'), word=q('.sb-word');
  function sentenceText(){ return S.sentence.map(x=>x.word).join(' ').replace(/\s+([,.!?])/g,'$1'); }
  function renderSentence(){
    sentenceEl.innerHTML="";
    if(!S.sentence.length){ sentenceEl.textContent=T('sentenceHint'); sentenceEl.classList.add('empty'); return; }
    sentenceEl.classList.remove('empty');
    S.sentence.forEach(part=>{const span=document.createElement('span');span.className='sb-part '+part.kind;span.textContent=part.word;sentenceEl.appendChild(span);});
  }
  function renderBanks(){
    banksEl.innerHTML="";
    ['who','does','what'].forEach(k=>{
      const group=document.createElement('section'); group.className='sb-bank '+k;
      const h=document.createElement('h3'); h.textContent=T('sentence_'+k); group.appendChild(h);
      const chips=document.createElement('div'); chips.className='sb-chips';
      S.banks[k].forEach((w,i)=>{
        const wrap=document.createElement('span'); wrap.className='sb-chip-wrap';
        const chip=document.createElement('button'); chip.type='button'; chip.className='sb-chip'; chip.textContent=w;
        chip.addEventListener('click',()=>{S.sentence.push({kind:k,word:w});renderSentence();});
        const remove=document.createElement('button'); remove.type='button'; remove.className='sb-chip-remove'; remove.textContent='×'; remove.title=T('sentenceRemove');
        remove.addEventListener('click',()=>{S.banks[k].splice(i,1);renderBanks();}); wrap.append(chip,remove); chips.appendChild(wrap);
      });
      group.appendChild(chips); banksEl.appendChild(group);
    });
  }
  function addWord(){const w=word.value.trim();if(!w)return;S.banks[kind.value].push(w);word.value='';renderBanks();}
  q('.sb-add-btn').addEventListener('click',addWord); word.addEventListener('keydown',e=>{e.stopPropagation();if(e.key==='Enter')addWord();});
  q('.sb-back').addEventListener('click',()=>{S.sentence.pop();renderSentence();});
  q('.sb-clear').addEventListener('click',()=>{S.sentence=[];renderSentence();});
  q('.sb-surprise').addEventListener('click',()=>{S.sentence=['who','does','what'].filter(k=>S.banks[k].length).map(kind=>({kind,word:S.banks[kind][Math.floor(Math.random()*S.banks[kind].length)]}));renderSentence();sndGood();confetti(sentenceEl)});
  q('.sb-speak').addEventListener('click',()=>{const text=sentenceText();if(text&&'speechSynthesis'in window){speechSynthesis.cancel();const u=new SpeechSynthesisUtterance(text);u.lang=LANG==='nl'?'nl-NL':'en-GB';speechSynthesis.speak(u);}});
  function labels(){
    [...kind.options].forEach(o=>o.textContent=T('sentence_'+o.value)); word.placeholder=T('sentenceAdd');
    q('.sb-surprise').textContent=T('sentenceSurprise');q('.sb-clear').textContent=T('sentenceClear'); q('.sb-speak').textContent=T('sentenceSpeak'); renderSentence();renderBanks();
  }
  root.classList.toggle("managed-learning-level",!!initState?.managedLearningLevel);
  document.addEventListener('langchange',labels);labels();
  return {getState:()=>({banks:S.banks,sentence:S.sentence})};
}