/* widget: Flitswoorden */
/* =========================================================
   Flash words widget
==========================================================*/
function mountFlits(root, initState, opts){
  const onProgress = opts && opts.onProgress;
  const S = { level:1, yearGroup:null, managedLearningLevel:false, card:0, dur:2, idx:0, order:[], score:0, tries:0, 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.dur = initState.dur || 2; S.score=+initState.score||0; S.tries=+initState.tries||0;S.assignmentWords=Array.isArray(initState.assignmentWords)?initState.assignmentWords:null;S.assignmentThemeName=typeof initState.assignmentThemeName==="string"?initState.assignmentThemeName:""; }
  const assignedRules=languageTaskRules(S.yearGroup,S.level);if(S.managedLearningLevel&&assignedRules)S.dur=assignedRules.flashSeconds;
  let flashTimer = null, assessed=false;

  root.innerHTML = `
    <div class="mt">
      <div class="mt-top">
        <select class="fl-sel fl-src"></select>
        <select class="fl-sel fl-dur"></select>
        <div class="mt-score fl-cnt"></div>
      </div>
      <p class="play-mission fl-mission"></p>
      <div class="mt-card">
        <div class="fl-word dim">• • •</div>
        <div class="fl-pic"></div>
      </div>
      <div class="fl-reflect" hidden>
        <p class="fl-question"></p>
        <div><button class="tbtn fl-got"></button><button class="tbtn ghost fl-again"></button></div>
      </div>
      <div class="trow" style="display:flex;gap:10px;justify-content:center;flex:none;">
        <button class="tbtn fl-flash"></button>
        <button class="tbtn ghost fl-show"></button>
        <button class="tbtn ghost fl-next"></button>
      </div>
    </div>`;
  const el = s => root.querySelector(s);
  const srcSel = el(".fl-src"), durSel = el(".fl-dur"),
        wordEl = el(".fl-word"), picEl = el(".fl-pic"), cntEl = el(".fl-cnt"), reflect=el(".fl-reflect");

  function list(){
    if(S.assignmentWords?.length)return languageWidgetWords(S.assignmentWords,S.yearGroup,S.level,"flits");
    S.card = normWordSource(S.card);const selected=languageWidgetWords(wordSourceList(S.card),S.yearGroup,S.level,"flits");
    if(selected.length)return selected;S.card="g";return languageWidgetWords(wordSourceList("g"),S.yearGroup,S.level,"flits");
  }
  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";}
    durSel.innerHTML = "";
    [0.5,1,2,3,5].forEach(d=>{
      const o = document.createElement("option");
      o.value = d; o.textContent = d+" "+T("flSec");
      durSel.appendChild(o);
    });
    durSel.value = S.dur;
  }
  function newRound(){
    S.order = shuffle(list().map((_,i)=>i));
    S.idx = 0;
  }
  function cur(){ return list()[S.order[S.idx]]; }
  function score(){ cntEl.textContent = `${T("word")} ${S.idx+1}/${S.order.length} · ${T("flScore").replace("{score}",S.score)}`; }
  function hide(ask=false){
    wordEl.textContent = "• • •";
    wordEl.classList.add("dim");
    picEl.textContent = "";
    reflect.hidden=!ask||assessed;
  }
  function flash(){
    clearTimeout(flashTimer);
    assessed=false;
    wordEl.textContent = cur()[0];
    wordEl.classList.remove("dim");
    picEl.textContent = "";
    reflect.hidden=true; score();
    flashTimer = setTimeout(()=>hide(true), S.dur*1000);
  }
  function show(){
    clearTimeout(flashTimer);
    wordEl.textContent = cur()[0];
    wordEl.classList.remove("dim");
    setPic(picEl, cur()[1]);
    reflect.hidden=assessed;
  }
  function assess(ok){
    if(assessed)return;assessed=true;
    S.tries++; if(ok){S.score++;sndGood();confetti(el('.mt-card'));}else sndBad();
    /* de zelfcheck van de leerling ("gelukt" / "nog oefenen") was tot nu toe
       alleen een sessieteller; het is het enige goed/fout-signaal dat deze
       widget heeft en dus precies wat de voortgang bij taal miste */
    if(onProgress) onProgress(languageProgressPayload({
      word: cur()[0], solved: ok, stars: ok?1:0, selfCheck: true }));
    score(); reflect.hidden=true;
  }
  el(".fl-flash").addEventListener("click", flash);
  el(".fl-show").addEventListener("click", show);
  el(".fl-got").addEventListener("click",()=>assess(true));
  el(".fl-again").addEventListener("click",()=>assess(false));
  el(".fl-next").addEventListener("click", ()=>{
    S.idx++;
    if(S.idx >= S.order.length){ celebrateAvatar(root); newRound(); }
    flash();
  });
  srcSel.addEventListener("change", ()=>{
    S.card = srcSel.value;
    newRound(); hide();
    cntEl.textContent = "";
  });
  durSel.addEventListener("change", ()=>{ S.dur = +durSel.value; });
  function labels(){
    el(".fl-flash").textContent = T("flFlash");
    el(".fl-show").textContent = T("flShow");
    el(".fl-next").textContent = T("flNext");
    const letters=languageTaskRules(S.yearGroup,S.level)?.literacyMode==="letters";
    el(".fl-mission").textContent=letters?(LANG==="nl"?"Bekijk en benoem de letter.":"Look at and name the letter."):T("flMission");
    el(".fl-question").textContent=letters?(LANG==="nl"?"Herkende je de letter?":"Did you recognise the letter?"):T("flQuestion");
    el(".fl-got").textContent=T("flGotIt");
    el(".fl-again").textContent=T("flAgain");
    buildSrc();
    if(S.order.length)score();
  }
  document.addEventListener("langchange", ()=>{ if(!S.assignmentWords)S.card=0; labels(); newRound(); hide(); });
  document.addEventListener("wordschange", ()=>{ buildSrc(); newRound(); hide(); });
  labels(); newRound();
  root.classList.toggle("managed-learning-level",S.managedLearningLevel);
  return { getState: ()=>({card:S.card, dur:S.dur, score:S.score, tries:S.tries}) };
}