/* teach - herbruikbare plaatjeskiezer (emoji / ARASAAC-zoeken / eigen upload).
   Bouwt voort op dezelfde bouwstenen als de woordkaart-editor in letters.js
   (EMOJI_CATS, arasaacSearch/arasaacUrl, setPic, dezelfde CSS-klassen) i.p.v.
   een tweede plaatjessysteem te maken. Gebruikt door widgets die snel een los
   plaatje willen laten kiezen zonder de volledige woordkaart-editor te openen
   (bv. Ankerwoorden, als snelkoppeling vanaf een woord zonder automatisch plaatje). */
"use strict";
let pickerWrap = null, pickerCat = 0, pickerOnSelect = null;

function choosePic(pic){
  if(pickerOnSelect) pickerOnSelect(pic);
  closePicPicker();
}
function closePicPicker(){
  if(pickerWrap) pickerWrap.classList.remove("open");
  pickerOnSelect = null;
}

function ensurePicPicker(){
  if(pickerWrap) return pickerWrap;
  const wrap = document.createElement("div");
  wrap.className = "modalwrap";
  wrap.innerHTML = `
    <div class="modal">
      <div class="am-head">
        <h2 data-i18n="pickPic"></h2>
        <button class="wclose pp-close">✕</button>
      </div>
      <div class="ed-tabs">
        <button type="button" data-t="emoji"></button>
        <button type="button" data-t="picto"></button>
        <button type="button" data-t="upload"></button>
      </div>
      <div class="ed-pane">
        <div class="ed-p-emoji">
          <div class="ed-cats"></div>
          <div class="ed-grid"></div>
        </div>
        <div class="ed-p-picto" style="display:none;">
          <div class="ed-pictorow">
            <input type="text" class="ed-psearch" maxlength="30">
            <button class="tbtn ed-pgo"></button>
          </div>
          <div class="ed-status"></div>
          <div class="ed-pgrid"></div>
          <div class="ed-credit"></div>
        </div>
        <div class="ed-p-upload" style="display:none;">
          <label class="ed-upload"><span class="ed-uplbl"></span><input type="file" accept="image/*"></label>
          <div class="ed-uphint"></div>
        </div>
      </div>
    </div>`;
  document.body.appendChild(wrap);
  pickerWrap = wrap;
  const q = s => wrap.querySelector(s);

  wrap.addEventListener("click", e=>{ if(e.target===wrap) closePicPicker(); });
  q(".pp-close").addEventListener("click", closePicPicker);

  let tab = "emoji";
  function setTab(t){ tab = t; refreshTabs(); }
  function applyLabels(){
    q(".ed-uplbl").textContent = T("upload");
    q(".ed-uphint").textContent = T("upHint");
    q(".ed-credit").innerHTML = T("pictoCredit");
    q(".ed-pgo").textContent = T("pictoSearch");
    q(".ed-psearch").placeholder = T("pictoPh");
    q(".pp-close").title = T("close");
    refreshTabs();
  }
  function refreshTabs(){
    wrap.querySelectorAll(".ed-tabs button").forEach(b=>{
      b.textContent = T("tab"+b.dataset.t[0].toUpperCase()+b.dataset.t.slice(1));
      b.classList.toggle("active", b.dataset.t===tab);
    });
    q(".ed-p-emoji").style.display  = tab==="emoji" ? "block" : "none";
    q(".ed-p-picto").style.display  = tab==="picto" ? "block" : "none";
    q(".ed-p-upload").style.display = tab==="upload" ? "block" : "none";
  }
  wrap.querySelectorAll(".ed-tabs button").forEach(b=>{
    b.addEventListener("click", ()=>{ tab = b.dataset.t; refreshTabs(); });
  });

  function renderCats(){
    const cats = q(".ed-cats");
    cats.innerHTML = "";
    T("cats").forEach((name,i)=>{
      const b = document.createElement("button");
      b.type = "button"; b.textContent = name;
      b.classList.toggle("active", i===pickerCat);
      b.addEventListener("click", ()=>{ pickerCat=i; renderCats(); });
      cats.appendChild(b);
    });
    const grid = q(".ed-grid");
    grid.innerHTML = "";
    EMOJI_CATS[pickerCat].forEach(em=>{
      const b = document.createElement("button");
      b.type = "button"; b.textContent = em;
      b.addEventListener("click", ()=>choosePic(em));
      grid.appendChild(b);
    });
  }

  async function searchPictos(){
    const term = q(".ed-psearch").value.trim();
    if(!term) return;
    q(".ed-status").textContent = T("pictoLoad");
    q(".ed-pgrid").innerHTML = "";
    try{
      const arr = await arasaacSearch(term, LANG);
      if(!arr.length){ q(".ed-status").textContent = T("pictoNone"); return; }
      q(".ed-status").textContent = "";
      arr.slice(0,12).forEach(p=>{
        const url = arasaacUrl(p._id);
        const b = document.createElement("button");
        b.type = "button";
        const im = document.createElement("img");
        im.src = url; im.loading = "lazy"; im.alt = term;
        b.appendChild(im);
        b.addEventListener("click", ()=>choosePic(url));
        q(".ed-pgrid").appendChild(b);
      });
    }catch(e){ q(".ed-status").textContent = T("pictoErr"); }
  }
  q(".ed-pgo").addEventListener("click", searchPictos);
  q(".ed-psearch").addEventListener("keydown", e=>{ if(e.key==="Enter") searchPictos(); });

  q(".ed-p-upload input").addEventListener("change", e=>{
    const f = e.target.files[0]; if(!f) return;
    const img = new Image();
    img.onload = ()=>{
      const c = document.createElement("canvas");
      const s = Math.min(1, 128/Math.max(img.width, img.height));
      c.width = Math.round(img.width*s); c.height = Math.round(img.height*s);
      c.getContext("2d").drawImage(img, 0, 0, c.width, c.height);
      choosePic(c.toDataURL("image/png"));
      URL.revokeObjectURL(img.src);
    };
    img.src = URL.createObjectURL(f);
    e.target.value = "";
  });

  wrap.__applyLabels = applyLabels;
  wrap.__renderCats = renderCats;
  wrap.__searchPictos = searchPictos;
  wrap.__setTab = setTab;
  return wrap;
}

function openPicPicker(word, onSelect){
  const wrap = ensurePicPicker();
  pickerOnSelect = onSelect;
  wrap.__applyLabels();
  wrap.__renderCats();
  wrap.querySelector(".ed-psearch").value = word || "";
  /* met een woord starten we meteen op het picto-zoekresultaat i.p.v. het emoji-tabblad,
     anders lijkt de vooraf ingevulde zoekopdracht nergens naartoe te leiden */
  wrap.__setTab(word ? "picto" : "emoji");
  wrap.classList.add("open");
  if(word) wrap.__searchPictos();
}