/* teach - instellingen-schil: één sectieregister als enige bron van waarheid.
   Elke sectie meldt zich aan met zichtbaarheid per rol, een activate() en
   zoekgegevens; de schil bouwt daar de navigatie (gegroepeerd: Persoonlijk /
   School / Systeem), de sectiekop en de zoekfunctie uit op. Zo bepaalt de rol
   van de ingelogde gebruiker vanzelf wat er te zien is: een gast alleen
   Weergave, een leerling/ouder Account + Weergave, staf ook de beheerdelen
   (admin.js registreert die zelf - de schil kent het beheer niet van binnen).
   De zoekbalk zoekt door sectienamen, instelling-trefwoorden én data
   (gebruikers/klassen/scholen via searchItems van de secties). */
"use strict";
const ST_SECTIONS = [];
function registerSettingsSection(sec){ ST_SECTIONS.push(sec); }

(function(){
  const wrap = document.getElementById("settingsWrap");
  const nav = document.getElementById("stNav");
  const content = document.getElementById("stContent");
  const secHead = document.getElementById("stSecHead");
  const searchInp = document.getElementById("stSearch");
  const resultsEl = document.getElementById("stSearchResults");
  let activeSection = null;

  const el = (tag, cls, text)=>{
    const e = document.createElement(tag);
    if(cls) e.className = cls;
    if(text != null) e.textContent = text;
    return e;
  };
  const visibleSections = ()=>
    ST_SECTIONS.filter(s=>s.visible()).sort((a,b)=>(a.order||99)-(b.order||99));

  /* ---- ingebouwde secties: Account en Weergave ------------------------------ */
  registerSettingsSection({
    id:"account", icon:"👤", group:"personal", order:1,
    label:()=>T("stAccount"), sub:()=>T("stAccountSub"),
    visible:()=>!!currentUser,
    activate(){ showDomSection("account"); loadBackups(); },
    keywords:()=>[T("stPassword"), T("stBackups"), T("stSession"), T("logout"),
      "wachtwoord","password","reservekopie","backup","herstel","restore",
      "uitloggen","logout","sessie","session","naam","name"],
  });
  registerSettingsSection({
    id:"view", icon:"🎨", group:"personal", order:2,
    label:()=>T("stView"), sub:()=>T("stViewSub"),
    visible:()=>true,
    activate(){ showDomSection("view"); },
    keywords:()=>[T("vwTheme"), T("vwContrast"), T("vwLang"), T("vwTbar"), T("vwMotion"), T("vwGlass"),
      "thema","theme","donker","dark","licht","light","contrast","taal","language",
      "menubalk","toolbar","animaties","animations","glas","glass"],
  });

  /* de drie DOM-secties (account/view/admin-host); beheer-secties delen de
     admin-host, admin.js wisselt daarbinnen zelf van paneel */
  function showDomSection(id){
    resultsEl.style.display = "none";
    content.querySelectorAll(".st-section").forEach(s=>{
      s.style.display = s.dataset.section===id ? "" : "none";
    });
  }
  window.showAdminHost = ()=>showDomSection("admin");

  const GROUPS = [["personal","stGroupPersonal"], ["school","stGroupSchool"], ["system","stGroupSystem"]];
  function buildNav(){
    nav.innerHTML = "";
    const secs = visibleSections();
    GROUPS.forEach(([g, key])=>{
      const inGroup = secs.filter(s=>s.group===g);
      if(!inGroup.length) return;
      /* groepskoppen pas als er echt iets te groeperen valt (staf); een
         gast/leerling met 1-2 secties krijgt een kale, rustige lijst */
      if(secs.length > 3) nav.appendChild(el("div","st-nav-group", T(key)));
      inGroup.forEach(s=>{
        const b = el("button","st-nav-btn");
        b.type = "button";
        b.dataset.section = s.id;
        b.appendChild(el("span","st-nav-ico", s.icon));
        b.appendChild(el("span","st-nav-lbl", s.label()));
        b.addEventListener("click", ()=>goSection(s.id));
        nav.appendChild(b);
      });
    });
  }

  async function goSection(id, payload){
    const s = ST_SECTIONS.find(x=>x.id===id && x.visible());
    if(!s) return;
    activeSection = id;
    searchInp.value = "";
    nav.querySelectorAll(".st-nav-btn").forEach(b=>b.classList.toggle("active", b.dataset.section===id));
    secHead.innerHTML = "";
    secHead.appendChild(el("div","st-sec-title", s.icon + "  " + s.label()));
    if(s.sub) secHead.appendChild(el("div","st-sec-sub", s.sub()));
    content.scrollTop = 0;
    await s.activate(payload);
  }
  window.goSettingsSection = goSection;

  /* ---- zoeken ---------------------------------------------------------------
     drie lagen per zichtbare sectie: (1) sectienaam, (2) trefwoorden van de
     instellingen erin, (3) live data (searchItems: gebruikers/klassen/scholen).
     Resultaten vervangen de inhoud; een klik navigeert (en filtert waar kan). */
  function doSearch(){
    const q = searchInp.value.trim().toLowerCase();
    if(!q){
      if(activeSection) goSection(activeSection);
      return;
    }
    nav.querySelectorAll(".st-nav-btn").forEach(b=>b.classList.remove("active"));
    secHead.innerHTML = "";
    resultsEl.innerHTML = "";
    content.querySelectorAll(".st-section").forEach(s=>{ s.style.display = "none"; });
    let total = 0;
    visibleSections().forEach(s=>{
      const hits = [];
      if(s.label().toLowerCase().includes(q)){
        hits.push({ icon:s.icon, label:s.label(), sub:T("stOpenSection"), go:()=>goSection(s.id) });
      }else{
        const kw = (s.keywords ? s.keywords() : []).find(k=>String(k).toLowerCase().includes(q));
        if(kw) hits.push({ icon:s.icon, label:String(kw), sub:s.label(), go:()=>goSection(s.id) });
      }
      if(s.searchItems) hits.push(...s.searchItems(q));
      if(!hits.length) return;
      total += hits.length;
      resultsEl.appendChild(el("div","st-nav-group", s.label()));
      hits.slice(0, 8).forEach(hit=>{
        const row = el("button","st-result");
        row.type = "button";
        row.appendChild(el("span","st-nav-ico", hit.icon || s.icon));
        row.appendChild(el("span","st-result-lbl", hit.label));
        if(hit.sub) row.appendChild(el("span","st-result-sub", hit.sub));
        row.addEventListener("click", ()=>hit.go());
        resultsEl.appendChild(row);
      });
    });
    if(!total) resultsEl.appendChild(el("div","guestnote", T("stNoResults")));
    resultsEl.style.display = "";
  }
  searchInp.addEventListener("input", doSearch);
  searchInp.addEventListener("keydown", e=>{
    e.stopPropagation();
    if(e.key==="Escape"){ searchInp.value = ""; doSearch(); }
    if(e.key==="Enter"){ const first = resultsEl.querySelector(".st-result"); if(first) first.click(); }
  });

  /* ---- openen ---------------------------------------------------------------- */
  window.openSettings = function(section){
    const msg = document.getElementById("settingsMsg");
    msg.textContent = ""; msg.classList.remove("ok");
    searchInp.value = "";
    searchInp.placeholder = T("stSearchPh");
    buildNav();
    goSection(section || (currentUser ? "account" : "view"));
    /* beheerdata alvast op de achtergrond laden zodat zoeken op namen van
       gebruikers/klassen/scholen meteen wat oplevert (admin.js bewaakt zelf
       dat er maar één keer geladen wordt) */
    if(currentUser && can("admin.access") && window.adminPrefetch) window.adminPrefetch();
    wrap.classList.add("open");
  };
  document.addEventListener("langchange", ()=>{
    searchInp.placeholder = T("stSearchPh");
    if(wrap.classList.contains("open")){ buildNav(); if(activeSection) goSection(activeSection); }
  });
  document.addEventListener("userchange", ()=>{
    if(wrap.classList.contains("open")){
      buildNav();
      const secs = visibleSections();
      if(!secs.some(s=>s.id===activeSection)) goSection(secs[0] ? secs[0].id : "view");
      else goSection(activeSection);
    }
  });
})();