/* widget: Hakken & plakken */
/* Veelvoorkomende spellingpatronen blijven als herkenbare klankgroep bij elkaar.
   De langste groep wint, zodat bijvoorbeeld 'sch' niet als 's' + 'ch' eindigt. */
function soundChunks(word, lang=LANG){
  const patterns=(lang==='nl'
    ? ['sch','aai','ooi','oei','eeuw','ieuw','ng','nk','ch','aa','ee','oo','uu','oe','ie','ei','ij','ou','au','ui','eu']
    : ['tch','igh','sh','ch','th','ph','ng','ee','oo','ea','ou','ow','ai','ay','oi']).sort((a,b)=>b.length-a.length);
  const chunks=[];
  for(let i=0;i<word.length;){
    const rest=word.slice(i).toLocaleLowerCase(lang==='nl'?'nl':'en');
    const match=patterns.find(pattern=>rest.startsWith(pattern));
    const length=match?match.length:1;
    chunks.push(word.slice(i,i+length)); i+=length;
  }
  return chunks;
}

/* =========================================================
   Chop & blend widget — words in sounds, with read-aloud
==========================================================*/
function mountHak(root, initState){
  const S = { level:1, yearGroup:null, managedLearningLevel:false, card:0, idx:0, order:[], chopped:false, assignmentWords:null, assignmentThemeName:"" };
  if(initState){S.level=initState.level||1;S.yearGroup=initState.yearGroup||null;S.managedLearningLevel=!!initState.managedLearningLevel;S.card = initState.card ?? 0;S.assignmentWords=Array.isArray(initState.assignmentWords)?initState.assignmentWords:null;S.assignmentThemeName=typeof initState.assignmentThemeName==="string"?initState.assignmentThemeName:"";}
  const canSpeak = "speechSynthesis" in window;

  root.innerHTML = `
    <div class="mt">
      <div class="mt-top">
        <select class="fl-sel hk-src"></select>
        <div class="mt-score hk-cnt"></div>
      </div>
      <p class="play-mission hk-hint"></p>
      <div class="mt-card">
        <div class="fl-pic hk-pic"></div>
        <div class="hk-word"></div>
      </div>
      <div class="trow" style="display:flex;gap:8px;justify-content:center;flex-wrap:wrap;flex:none;">
        <button class="tbtn hk-say" ${canSpeak?"":'style="display:none"'}></button>
        <button class="tbtn ghost hk-chop"></button>
        <button class="tbtn ghost hk-glue"></button>
        <button class="tbtn ghost hk-next">▸</button>
      </div>
    </div>`;
  const el = s => root.querySelector(s);
  const srcSel = el(".hk-src"), wordEl = el(".hk-word"),
        picEl = el(".hk-pic"), cntEl = el(".hk-cnt");

  function list(){
    if(S.assignmentWords?.length)return languageWidgetWords(S.assignmentWords,S.yearGroup,S.level,"hak");
    S.card = normWordSource(S.card);const selected=languageWidgetWords(wordSourceList(S.card),S.yearGroup,S.level,"hak");
    if(selected.length)return selected;S.card="g";return languageWidgetWords(wordSourceList("g"),S.yearGroup,S.level,"hak");
  }
  function buildSrc(){if(S.assignmentWords?.length){srcSel.innerHTML="";srcSel.appendChild(new Option("🎯 "+(S.assignmentThemeName||T("castTheme")),"assignment"));srcSel.disabled=true;}else{srcSel.disabled=false;fillWordSourceSel(srcSel,S.card,S.yearGroup,S.level);S.card=srcSel.value||"g";}}
  function cur(){ return list()[S.order[S.idx]]; }
  function newRound(){ S.order = shuffle(list().map((_,i)=>i)); S.idx = 0; }
  function display(){
    const [w, pic,, anchor] = cur();
    const letters=languageTaskRules(S.yearGroup,S.level)?.literacyMode==="letters";
    wordEl.innerHTML = "";
    if(letters&&!S.chopped){
      const s=document.createElement("span");s.className="hk-whole";s.textContent="?";wordEl.appendChild(s);
    }else if(S.chopped){
      soundChunks(w).forEach((l,i)=>{
        if(i>0){
          const sep = document.createElement("span");
          sep.className = "hk-sep"; sep.textContent = "–";
          wordEl.appendChild(sep);
        }
        const s = document.createElement("span");
        s.className = "hk-l " + (/[aeiouyáéíóúäëïöü]/i.test(l) ? "v" : "c");
        s.textContent = l;
        s.style.animationDelay = (i*0.08)+"s";
        wordEl.appendChild(s);
      });
    }else{
      const s = document.createElement("span");
      s.className = "hk-whole";
      s.textContent = w;
      wordEl.appendChild(s);
    }
    setPic(picEl, pic);
    picEl.title = anchor||w;
    cntEl.textContent = `${T("word")} ${S.idx+1}/${S.order.length}`;
  }
  function speak(text, rate){
    if(!canSpeak) return;
    speechSynthesis.cancel();
    const u = new SpeechSynthesisUtterance(text);
    u.lang = LANG==="nl" ? "nl-NL" : "en-GB";
    u.rate = rate;
    speechSynthesis.speak(u);
  }
  el(".hk-say").addEventListener("click", ()=>{
    const [word,,,anchor]=cur(),letters=languageTaskRules(S.yearGroup,S.level)?.literacyMode==="letters";
    if(letters)speak(anchor||word,0.75);
    else if(S.chopped)speak(soundChunks(word).join(", "),0.7);
    else speak(word,0.85);
  });
  el(".hk-chop").addEventListener("click", ()=>{ S.chopped = true; display(); play(sndGood); });
  el(".hk-glue").addEventListener("click", ()=>{ S.chopped = false; display(); play(sndGood); });
  el(".hk-next").addEventListener("click", ()=>{
    S.idx++; if(S.idx >= S.order.length) newRound();
    S.chopped = false; display();
  });
  const play = f=>f();
  srcSel.addEventListener("change", ()=>{
    S.card = srcSel.value;
    newRound(); S.chopped = false; display();
  });
  function labels(){
    const letters=languageTaskRules(S.yearGroup,S.level)?.literacyMode==="letters";
    el(".hk-say").textContent = T("hakSay");
    el(".hk-chop").textContent = letters?(LANG==="nl"?"Toon letter":"Show letter"):T("hakChop");
    el(".hk-glue").textContent = letters?(LANG==="nl"?"Verberg letter":"Hide letter"):T("hakGlue");
    el(".hk-hint").textContent = letters?(LANG==="nl"?"Luister naar het woord. Welke letter hoor je vooraan?":"Listen to the word. Which letter do you hear first?"):T("hakHint");
    buildSrc();
  }
  document.addEventListener("langchange", ()=>{ if(!S.assignmentWords)S.card=0; labels(); newRound(); S.chopped=false; display(); });
  document.addEventListener("wordschange", ()=>{ buildSrc(); newRound(); S.chopped=false; display(); });
  labels(); newRound(); display();
  root.classList.toggle("managed-learning-level",S.managedLearningLevel);
  return { getState: ()=>({card:S.card}) };
}