/* teach - beheerpaneel (👥): gebruikers, klassen en scholen.
   Zichtbaar voor super (alles), admin (eigen school) en teacher (leerlingen). */
"use strict";
(function(){
  const wrap = document.getElementById("adminWrap");
  const modal = document.getElementById("adminModal");
  const btn = document.getElementById("btnAdmin");
  let SCHOOLS = [], USERS = [], CLASSES = [], selSchool = null;

  const esc = s => String(s ?? "").replace(/&/g,"&amp;").replace(/</g,"&lt;");
  const h = (tag, cls, text)=>{
    const el = document.createElement(tag);
    if(cls) el.className = cls;
    if(text != null) el.textContent = text;
    return el;
  };
  const msg = t => { const m = modal.querySelector(".am-msg"); if(m) m.textContent = t; };

  btn.addEventListener("click", async ()=>{
    if(!currentUser || currentUser.role==="pupil") return;
    selSchool = currentUser.role==="super" ? (selSchool ?? "") : currentUser.schoolId;
    await reload();
    wrap.classList.add("open");
  });
  wrap.addEventListener("click", e=>{ if(e.target===wrap) wrap.classList.remove("open"); });
  document.addEventListener("userchange", ()=>{ if(!currentUser) wrap.classList.remove("open"); });

  async function reload(){
    try{
      if(currentUser.role==="super") SCHOOLS = await api("/schools");
      const q = currentUser.role==="super" && selSchool ? "?school="+selSchool : "";
      USERS = (await api("/admin/users"+q)).users;
      const cq = currentUser.role==="super" ? (selSchool ? "?school="+selSchool : "?school=0") : "";
      CLASSES = (await api("/admin/classes"+cq)).classes || [];
    }catch(e){ USERS = []; CLASSES = []; }
    render();
  }

  function classSel(current){
    const sel = h("select","am-sel");
    sel.appendChild(new Option(T("amNoClass"), ""));
    CLASSES.forEach(c=>sel.appendChild(new Option(c.name, c.id)));
    sel.value = current ?? "";
    return sel;
  }

  function userRow(u){
    const row = h("div","am-row");
    row.appendChild(h("span","am-name", u.displayName + (u.displayName!==u.username ? ` (${u.username})` : "")));
    row.appendChild(h("span","am-role", T(roleKey(u.role))));
    if(u.role==="pupil"){
      /* klas (uitwisselen met andere klassen) */
      const cs = classSel(u.classId);
      cs.addEventListener("change", async ()=>{
        try{ await api("/admin/users/"+u.id, {method:"PATCH", body:{classId: cs.value ? +cs.value : null}}); }
        catch(e){ msg(e.message); }
      });
      row.appendChild(cs);
      /* wachtwoord inzien en aanpassen - alleen zichtbaar zolang de leerling
         nog niet is ingelogd; daarna kan alleen een nieuw wachtwoord gezet worden */
      const pw = h("input","am-pw");
      pw.value = u.password || "";
      pw.placeholder = u.everLoggedIn ? T("amPwHidden") : "";
      pw.title = T("amPw");
      pw.addEventListener("keydown", ev=>ev.stopPropagation());
      pw.addEventListener("change", async ()=>{
        if(pw.value.length < 4) return;
        try{ await api("/admin/users/"+u.id, {method:"PATCH", body:{password: pw.value}}); reload(); }
        catch(e){ msg(e.message); }
      });
      row.appendChild(pw);
      if(u.everLoggedIn){
        const gen = h("button","am-btn","🎲");
        gen.title = T("amGenerate");
        gen.addEventListener("click", async ()=>{
          try{
            const { password } = await api("/admin/genpw?role=pupil");
            await api("/admin/users/"+u.id, {method:"PATCH", body:{password}});
            msg(`${T("amPwSet")} ${password}`);
            reload();
          }catch(e){ msg(e.message); }
        });
        row.appendChild(gen);
      }
    }else{
      if(u.pending && u.linkCode){
        row.appendChild(h("span","am-code", T("amCode")+": "+u.linkCode));
      }else if(u.pending){
        row.appendChild(h("span","am-code", T("amPending")));
      }
      if(["super","admin"].includes(currentUser.role) && u.role!=="pupil" && u.id!==currentUser.id){
        const nc = h("button","am-btn", T("amNewCode"));
        nc.addEventListener("click", async ()=>{
          try{
            const r = await api("/admin/users/"+u.id, {method:"PATCH", body:{newLinkCode:true}});
            msg(`${T("amCreated")} ${r.linkCode}`);
            reload();
          }catch(e){ msg(e.message); }
        });
        row.appendChild(nc);
        /* direct een nieuw wachtwoord zetten, zonder de koppelcode-activatie */
        const np = h("button","am-btn", T("amNewPw"));
        np.addEventListener("click", async ()=>{
          try{
            const r = await api("/admin/users/"+u.id, {method:"PATCH", body:{generatePassword:true}});
            msg(`${T("amPwSet")} ${r.password}`);
            reload();
          }catch(e){ msg(e.message); }
        });
        row.appendChild(np);
      }
    }
    if(u.id !== currentUser.id){
      const del = h("button","am-del","🗑");
      del.title = T("amDelete") || "";
      del.addEventListener("click", async ()=>{
        if(!confirm(T("amConfirmDel"))) return;
        try{ await api("/admin/users/"+u.id, {method:"DELETE"}); reload(); }
        catch(e){ msg(e.message); }
      });
      row.appendChild(del);
    }
    return row;
  }

  function addForm(role){
    const f = h("div","am-add");
    const name = h("input","am-inp");
    name.placeholder = T("amUserPh");
    name.addEventListener("keydown", ev=>ev.stopPropagation());
    f.appendChild(name);
    let cs = null;
    if(role==="pupil"){ cs = classSel(""); f.appendChild(cs); }
    let pwInp = null;
    if(role!=="pupil"){
      /* optioneel: meteen zelf een wachtwoord instellen i.p.v. een koppelcode
         (die de gebruiker normaal zelf gebruikt om een wachtwoord te kiezen) */
      pwInp = h("input","am-inp am-pwinp");
      pwInp.type = "password";
      pwInp.autocomplete = "new-password";
      pwInp.placeholder = T("amPwOptional");
      pwInp.addEventListener("keydown", ev=>ev.stopPropagation());
      f.appendChild(pwInp);
      const gen = h("button","am-btn","🎲");
      gen.type = "button";
      gen.title = T("amGenerate");
      gen.addEventListener("click", async ()=>{
        try{
          const { password } = await api("/admin/genpw");
          pwInp.type = "text";
          pwInp.value = password;
        }catch(e){ msg(e.message); }
      });
      f.appendChild(gen);
    }
    const go = h("button","tbtn", T(role==="pupil" ? "amNewPupil" : role==="teacher" ? "amNewTeacher" : role==="admin" ? "amNewAdmin" : "amNewSuper"));
    go.addEventListener("click", async ()=>{
      const body = { role, username: name.value.trim(), displayName: name.value.trim() };
      if(role==="pupil" && cs && cs.value) body.classId = +cs.value;
      if(pwInp && pwInp.value.trim()) body.password = pwInp.value.trim();
      if(currentUser.role==="super" && role!=="super") body.school = +selSchool;
      try{
        const r = await api("/admin/users", { body });
        msg(role==="pupil"
          ? `${T("amPupilMade")} ${r.user.password}`
          : r.user.password
            ? `${T("amPwSet")} ${r.user.password}`
            : `${T("amCreated")} ${r.user.linkCode}`);
        name.value = "";
        if(pwInp) pwInp.value = "";
        reload();
      }catch(e){ msg(e.message); }
    });
    f.appendChild(go);
    return f;
  }

  function render(){
    modal.innerHTML = "";
    const head = h("div","am-head");
    head.appendChild(h("h2", null, T("beheer")));
    const close = h("button","wclose","✕");
    close.addEventListener("click", ()=>wrap.classList.remove("open"));
    head.appendChild(close);
    modal.appendChild(head);

    /* super: schoolkiezer + nieuwe school */
    if(currentUser.role==="super"){
      const bar = h("div","am-add");
      const sel = h("select","am-sel");
      sel.appendChild(new Option(T("amAllSchools"), ""));
      SCHOOLS.forEach(s=>sel.appendChild(new Option(s.name, s.id)));
      sel.value = selSchool ?? "";
      sel.addEventListener("change", ()=>{ selSchool = sel.value; reload(); });
      bar.appendChild(sel);
      const inp = h("input","am-inp");
      inp.placeholder = T("amNamePh");
      inp.addEventListener("keydown", ev=>ev.stopPropagation());
      bar.appendChild(inp);
      const add = h("button","tbtn", T("amNewSchool"));
      add.addEventListener("click", async ()=>{
        if(!inp.value.trim()) return;
        try{
          const r = await api("/admin/schools", { body:{ name: inp.value.trim() } });
          selSchool = r.school.id; inp.value = "";
          reload();
        }catch(e){ msg(e.message); }
      });
      bar.appendChild(add);
      modal.appendChild(bar);
    }

    modal.appendChild(h("div","am-msg"));

    /* klassen (admin/super binnen een school) */
    const schoolChosen = currentUser.role!=="super" || !!selSchool;
    if(schoolChosen){
      modal.appendChild(h("h3","am-h3", T("amClasses")));
      const cwrapEl = h("div","am-classes");
      CLASSES.forEach(c=>{
        const chip = h("span","am-chip", c.name);
        if(["super","admin"].includes(currentUser.role)){
          const x = h("button","am-chipx","✕");
          x.addEventListener("click", async ()=>{
            try{ await api("/admin/classes/"+c.id, {method:"DELETE"}); reload(); }
            catch(e){ msg(e.message); }
          });
          chip.appendChild(x);
        }
        cwrapEl.appendChild(chip);
      });
      modal.appendChild(cwrapEl);
      if(["super","admin"].includes(currentUser.role)){
        const f = h("div","am-add");
        const inp = h("input","am-inp");
        inp.placeholder = T("amNamePh");
        inp.addEventListener("keydown", ev=>ev.stopPropagation());
        f.appendChild(inp);
        const go = h("button","tbtn", T("amNewClass"));
        go.addEventListener("click", async ()=>{
          if(!inp.value.trim()) return;
          try{
            await api("/admin/classes", { body:{ name: inp.value.trim(), school: selSchool ? +selSchool : undefined } });
            reload();
          }catch(e){ msg(e.message); }
        });
        f.appendChild(go);
        modal.appendChild(f);
      }
    }

    /* gebruikers */
    modal.appendChild(h("h3","am-h3", T("amUsers")));
    const list = h("div","am-list");
    const groups = [["super", T("amSuperGroup")], ["admin", T("roleAdmin")], ["teacher", T("roleTeacher")], ["pupil", T("rolePupil")]];
    groups.forEach(([role, label])=>{
      const us = USERS.filter(u=>u.role===role);
      if(!us.length) return;
      list.appendChild(h("div","am-group", label));
      us.forEach(u=>list.appendChild(userRow(u)));
    });
    modal.appendChild(list);

    /* toevoegen */
    if(schoolChosen){
      if(["super","admin","teacher"].includes(currentUser.role)) modal.appendChild(addForm("pupil"));
      if(["super","admin"].includes(currentUser.role)){
        modal.appendChild(addForm("teacher"));
        modal.appendChild(addForm("admin"));
      }
    }
    if(currentUser.role==="super") modal.appendChild(addForm("super"));
  }
})();