/* teach - ouderportaal: ouders (role parent) zien geen whiteboard maar een
   portaal met hun gekoppelde kinderen. Per kind: school/klas (of "thuis"),
   voortgangstijdlijn, en voor thuiskinderen een aanmelding bij een school
   (doorzoekbare lijst; de school handelt het verzoek af in het beheer).
   Kinderen komen erbij door ze zelf aan te maken (thuiskind, wachtwoord
   eenmalig zichtbaar) of via een eenmalige ouder-code van de school. */
"use strict";
const parentView = document.getElementById("parentView");
/* opengeklapte voortgang/aanmeldformulieren en eenmalige resultaten
   (kind-wachtwoord) blijven behouden over her-renders van het portaal */
const parentOpen = new Set();
const parentResults = new Map();
let PARENT_SCHOOLS = [];

function prH(tag, cls, text){
  const el = document.createElement(tag);
  if(cls) el.className = cls;
  if(text != null) el.textContent = text;
  return el;
}
/* arm-then-confirm zoals dangerBtn in het beheer: eerste klik wapent ("zeker?"),
   tweede klik voert uit, na 4s ontwapent hij vanzelf */
function prDangerBtn(label, warnKey, fn){
  const b = prH("button","am-btn am-danger", label);
  b.type = "button";
  if(warnKey) b.title = T(warnKey);
  let timer = null;
  b.addEventListener("click", async ()=>{
    if(!timer){
      b.classList.add("armed");
      b.textContent = "⚠ " + T("amSure");
      timer = setTimeout(()=>{ timer = null; b.classList.remove("armed"); b.textContent = label; }, 4000);
      return;
    }
    clearTimeout(timer); timer = null;
    b.classList.remove("armed"); b.textContent = label;
    await fn(b);
  });
  return b;
}
function prMsg(t){
  const m = parentView.querySelector(".am-msg");
  if(m) m.textContent = t || "";
}

async function parentReload(){
  let children = [];
  try{ children = (await api("/parent/children")).children || []; }
  catch(e){ /* render toont dan een lege lijst; melding via prMsg hieronder */ }
  renderParentView(children);
}

function parentChildRow(c){
  const row = prH("div","am-row");
  row.appendChild(prH("span","am-name","🧒 " + c.displayName + (c.displayName!==c.username ? ` (${c.username})` : "")));
  const where = c.schoolName
    ? c.schoolName + (c.className ? ` · ${c.className}` : "")
    : T("parentHome") + (c.appliedTo ? ` · ${T("parentApplied")} ${c.appliedTo}` : "");
  row.appendChild(prH("span","am-role", where));

  const tools = prH("div","am-row-tools");
  const r = parentResults.get(c.id);
  if(r){
    const res = prH("div","am-result");
    res.appendChild(prH("span","am-result-lbl", r.label + ": "));
    const code = prH("code", null, r.value);
    res.appendChild(code);
    res.appendChild(prH("div","guestnote", T("parentPwNote")));
    tools.appendChild(res);
  }

  /* voortgangstijdlijn (zelfde regelopbouw als het beheer: widget, score, tijd) */
  const progHolder = prH("div","am-list");
  async function loadProgress(){
    progHolder.innerHTML = "";
    let events = [];
    try{ events = (await api("/progress/pupil/"+c.id)).events || []; }
    catch(e){ progHolder.appendChild(prH("div","guestnote", e.message)); return; }
    if(!events.length){ progHolder.appendChild(prH("div","guestnote", T("parentProgressEmpty"))); return; }
    events.forEach(ev=>{
      const line = prH("div","am-row");
      line.appendChild(prH("span","am-name", T("wg_"+ev.widgetType) || ev.widgetType));
      const scoreParts = [];
      if(ev.attempts) scoreParts.push(`${ev.correct}/${ev.attempts} ${T("mGoed")}`);
      if(ev.stars) scoreParts.push("★".repeat(ev.stars));
      line.appendChild(prH("span","am-code", scoreParts.join(" · ")));
      line.appendChild(prH("span","am-code", new Date(ev.createdAt).toLocaleString(LANG==="nl" ? "nl-NL" : "en-GB")));
      progHolder.appendChild(line);
    });
  }
  const progBtn = prH("button","am-btn", T("parentProgress"));
  progBtn.type = "button";
  progBtn.addEventListener("click", ()=>{
    const key = "prog:"+c.id;
    if(parentOpen.has(key)){ parentOpen.delete(key); progHolder.innerHTML = ""; }
    else{ parentOpen.add(key); loadProgress(); }
  });
  const actions = prH("div","am-actions");
  actions.appendChild(progBtn);

  /* thuiskind zonder lopende aanmelding: aanmelden bij een school via een
     doorzoekbare lijst (input + datalist gevuld uit de publieke /schools) */
  const applyHolder = prH("div","am-add");
  applyHolder.style.display = "none";
  if(!c.schoolId && !c.appliedTo){
    const applyBtn = prH("button","am-btn", T("parentApply"));
    applyBtn.type = "button";
    const inp = prH("input","am-inp");
    inp.placeholder = T("parentSchoolPh");
    inp.setAttribute("list","parentSchoolList");
    const go = prH("button","am-btn", T("parentApplyBtn"));
    go.type = "button";
    go.addEventListener("click", async ()=>{
      const s = PARENT_SCHOOLS.find(x=>x.name.toLowerCase()===inp.value.trim().toLowerCase());
      if(!s){ prMsg(T("parentSchoolPh")); return; }
      try{ await api(`/parent/children/${c.id}/apply`, { body:{ schoolId: s.id } }); parentOpen.delete("apply:"+c.id); parentReload(); }
      catch(e){ prMsg(e.message); }
    });
    applyHolder.appendChild(inp);
    applyHolder.appendChild(go);
    applyBtn.addEventListener("click", ()=>{
      const key = "apply:"+c.id;
      if(parentOpen.has(key)) parentOpen.delete(key); else parentOpen.add(key);
      applyHolder.style.display = parentOpen.has(key) ? "" : "none";
      if(parentOpen.has(key)) inp.focus();
    });
    applyHolder.style.display = parentOpen.has("apply:"+c.id) ? "" : "none";
    actions.appendChild(applyBtn);
  }

  actions.appendChild(prDangerBtn(T("parentUnlink"), "parentUnlinkWarn", async ()=>{
    try{ await api("/parent/children/"+c.id, { method:"DELETE" }); parentResults.delete(c.id); parentReload(); }
    catch(e){ prMsg(e.message); }
  }));
  tools.appendChild(actions);
  tools.appendChild(applyHolder);
  tools.appendChild(progHolder);
  row.appendChild(tools);
  if(parentOpen.has("prog:"+c.id)) loadProgress();
  return row;
}

/* ingeklapt formulier ("＋ …"-knop) zoals addForm in het beheer */
function parentCollapsedForm(label, build){
  const wrap = prH("div","am-add-wrap");
  const toggle = prH("button","tbtn ghost", label);
  toggle.type = "button";
  const f = prH("div","am-add");
  f.style.display = "none";
  toggle.addEventListener("click", ()=>{
    f.style.display = f.style.display==="none" ? "" : "none";
    const first = f.querySelector("input");
    if(f.style.display!=="none" && first) first.focus();
  });
  build(f);
  wrap.appendChild(toggle);
  wrap.appendChild(f);
  return wrap;
}

function renderParentView(children){
  parentView.innerHTML = "";
  const inner = prH("div","parent-inner");
  inner.appendChild(prH("h2","parent-title", T("parentTitle")));
  inner.appendChild(prH("div","am-msg"));

  const list = prH("div","am-list");
  if(!children.length) list.appendChild(prH("div","guestnote", T("parentNoChildren")));
  children.forEach(c=>list.appendChild(parentChildRow(c)));
  inner.appendChild(list);

  /* datalist voor de doorzoekbare schoolkeuze (gedeeld door alle rijen) */
  const dl = document.createElement("datalist");
  dl.id = "parentSchoolList";
  PARENT_SCHOOLS.forEach(s=>dl.appendChild(new Option(s.name)));
  inner.appendChild(dl);

  /* kind aanmaken (thuiskind): naam -> account zonder school + wachtwoord */
  inner.appendChild(parentCollapsedForm(T("parentAddChild"), f=>{
    const inp = prH("input","am-inp");
    inp.placeholder = T("parentChildNamePh");
    inp.maxLength = 30;
    const go = prH("button","am-btn", T("parentAddBtn"));
    go.type = "button";
    go.addEventListener("click", async ()=>{
      try{
        const r = await api("/parent/children", { body:{ name: inp.value.trim() } });
        parentResults.set(r.child.id, { label: T("amFieldPw"), value: r.child.password });
        parentReload();
      }catch(e){ prMsg(e.message); }
    });
    inp.addEventListener("keydown", ev=>{ if(ev.key==="Enter") go.click(); });
    f.appendChild(inp);
    f.appendChild(go);
  }));

  /* schoolkind koppelen met de eenmalige ouder-code van de school */
  inner.appendChild(parentCollapsedForm(T("parentLinkTitle"), f=>{
    f.appendChild(prH("div","guestnote", T("parentLinkNote")));
    const inp = prH("input","am-inp");
    inp.placeholder = T("parentLinkPh");
    inp.maxLength = 9;
    inp.style.textTransform = "uppercase";
    const go = prH("button","am-btn", T("parentLinkBtn"));
    go.type = "button";
    go.addEventListener("click", async ()=>{
      try{
        await api("/parent/children/link", { body:{ code: inp.value.trim().toUpperCase() } });
        inp.value = "";
        parentReload();
      }catch(e){ prMsg(e.message); }
    });
    inp.addEventListener("keydown", ev=>{ if(ev.key==="Enter") go.click(); });
    f.appendChild(inp);
    f.appendChild(go);
  }));

  parentView.appendChild(inner);
}

function startParentView(){
  document.body.classList.add("parent-mode");
  parentOpen.clear();
  parentResults.clear();
  (async ()=>{
    try{ PARENT_SCHOOLS = await api("/schools"); }catch(e){ PARENT_SCHOOLS = []; }
    parentReload();
  })();
}
function stopParentView(){
  document.body.classList.remove("parent-mode");
  parentView.innerHTML = "";
}