/* widget: Ballonnenwoord */
/* =========================================================
   Balloon word widget — guess before the balloons pop
==========================================================*/
function mountBall(root, initState, opts){
  const onProgress = opts && opts.onProgress;
  const S = { level:1, yearGroup:null, managedLearningLevel:false, card:0, snd:true, lives:6, guessed:new Set(), over:false, order:[], idx:0, stars:0 };
  if(initState){S.level=initState.level||1;S.yearGroup=initState.yearGroup||null;S.managedLearningLevel=!!initState.managedLearningLevel;S.card = initState.card ?? 0; S.snd = initState.snd !== false;}
  const assignedRules=languageTaskRules(S.yearGroup,S.level),maxLives=assignedRules?.lives||6;
  const play = f=>{ if(S.snd) f(); };

  root.innerHTML = `
    <div class="mt">
      <div class="mt-top">
        <button class="lg-snd"></button>
        <select class="fl-sel bl-src"></select>
        <div class="mt-score bl-score"></div>
      </div>
      <div class="mt-card">
        <div class="bl-balloons"></div>
        <div class="bl-word"></div>
        <div class="bl-msg"></div>
        <button class="lg-next bl-next"></button>
      </div>
      <div class="lg-tray bl-kbd lg-kbd" style="display:flex;"></div>
    </div>`;
  const el = s => root.querySelector(s);
  const srcSel = el(".bl-src"), balloonsEl = el(".bl-balloons"),
        wordEl = el(".bl-word"), msgEl = el(".bl-msg"),
        nextBtn = el(".bl-next"), kbdEl = el(".bl-kbd"),
        scoreEl = el(".bl-score"), sndBtn = el(".lg-snd");

  function list(){ S.card = normWordSource(S.card); return languageWordsForYear(wordSourceList(S.card),S.yearGroup,S.level); }
  function buildSrc(){ fillWordSourceSel(srcSel, S.card); }
  "abcdefghijklmnopqrstuvwxyz".split("").forEach(l=>{
    const b = document.createElement("button");
    b.textContent = l; b.dataset.l = l;
    b.className = VOWELS.includes(l) ? "v" : "c";
    b.addEventListener("click", ()=>guess(l, b));
    kbdEl.appendChild(b);
  });
  function word(){ return list()[S.order[S.idx]][0]; }
  function drawWord(reveal){
    wordEl.textContent = word().split("").map(l=>(reveal || S.guessed.has(l)) ? l : "_").join(" ");
  }
  function drawBalloons(){
    balloonsEl.textContent = "🎈".repeat(S.lives) + "💥".repeat(maxLives-S.lives);
  }
  function newWord(){
    if(!S.order.length || S.idx >= S.order.length){
      S.order = shuffle(list().map((_,i)=>i));
      S.idx = 0;
    }
    S.lives = maxLives; S.guessed = new Set(); S.over = false;
    msgEl.textContent = ""; msgEl.className = "bl-msg";
    nextBtn.classList.remove("show");
    kbdEl.querySelectorAll("button").forEach(b=>{ b.disabled = false; b.style.opacity = 1; });
    drawWord(false); drawBalloons();
    scoreEl.textContent = S.stars ? S.stars+" ★" : "";
  }
  function guess(l, btn){
    if(S.over || btn.disabled) return;
    btn.disabled = true; btn.style.opacity = .3;
    if(word().includes(l)){
      S.guessed.add(l);
      play(sndGood);
      drawWord(false);
      if(word().split("").every(x=>S.guessed.has(x))){
        S.over = true; S.stars++;
        msgEl.textContent = T("ballWin");
        msgEl.classList.add("win");
        play(sndWin); confetti(el(".mt-card"));
        nextBtn.classList.add("show");
        scoreEl.textContent = S.stars+" ★";
        if(onProgress) onProgress({ attempts: 1, correct: 1, stars: 1 });
      }
    }else{
      S.lives--;
      play(sndBad);
      drawBalloons();
      if(S.lives <= 0){
        S.over = true;
        drawWord(true);
        msgEl.textContent = `${T("ballLose")} ${word()}`;
        msgEl.classList.add("lose");
        nextBtn.classList.add("show");
      }
    }
  }
  nextBtn.addEventListener("click", ()=>{ S.idx++; newWord(); });
  srcSel.addEventListener("change", ()=>{
    S.card = srcSel.value;
    S.order = []; newWord();
  });
  sndBtn.addEventListener("click", ()=>{
    S.snd = !S.snd;
    sndBtn.textContent = S.snd ? "🔔" : "🔕";
    sndBtn.classList.toggle("off", !S.snd);
  });
  function labels(){
    sndBtn.textContent = S.snd ? "🔔" : "🔕";
    sndBtn.classList.toggle("off", !S.snd);
    sndBtn.title = T("sndWidget");
    nextBtn.textContent = T("next");
    buildSrc();
  }
  document.addEventListener("langchange", ()=>{ S.card=0; S.order=[]; labels(); newWord(); });
  document.addEventListener("wordschange", ()=>{ buildSrc(); S.order=[]; newWord(); });
  labels(); newWord();
  root.classList.toggle("managed-learning-level",S.managedLearningLevel);
  return { getState: ()=>({card:S.card, snd:S.snd}) };
}