/* teach - CMS van de systeemmanager: site-inhoud die zonder release aanpasbaar
   is. Drie sleutels (server: site_content, routes in api.js):
     welcome      - welkomstwoord op het inlogscherm, per taal;
     announcement - melding/banner voor alle gebruikers (aan/uit, info of
                    belangrijk, per taal; elke wijziging krijgt een nieuw id
                    zodat weggeklikte meldingen opnieuw verschijnen);
     widgetInfo   - per widget een eigen uitleg die de standaardtekst in de
                    widgetgalerij vervangt (per taal, leeg = standaard).
   Ankerdiagrammen/borden deelt de systeemmanager via de bestaande gedeelde
   bibliotheek (map 🌐 Systeem in de verkenner) en afbeeldingen via de
   catalogus - de Inhoud-sectie linkt daar rechtstreeks naartoe. */
"use strict";
let CMS = {};
(function(){
  const DISMISS_KEY = "teach.dismissedAnnouncement";
  const cmsEl = (tag, cls, text)=>{
    const e = document.createElement(tag);
    if(cls) e.className = cls;
    if(text != null) e.textContent = text;
    return e;
  };
  const inLang = v => v ? ((LANG==="en" ? v.en : v.nl) || v.nl || v.en || "") : "";

  async function loadContent(){
    try{ CMS = await api("/content") || {}; }catch(e){ CMS = {}; }
    renderAnnouncement();
    renderWelcome();
    document.dispatchEvent(new CustomEvent("cmschange"));
  }

  /* ---- banner (update-melding) voor iedereen -------------------------------- */
  let banner = null;
  function renderAnnouncement(){
    if(banner){ banner.remove(); banner = null; }
    const a = CMS.announcement;
    const text = a && a.active ? inLang(a) : "";
    if(!text) return;
    let dismissed = null;
    try{ dismissed = localStorage.getItem(DISMISS_KEY); }catch(e){}
    if(dismissed === String(a.id)) return;
    banner = cmsEl("div", "cms-banner" + (a.level==="warn" ? " warn" : ""));
    banner.appendChild(cmsEl("span", null, text));
    const x = cmsEl("button", "cms-banner-x", "✕");
    x.type = "button";
    x.title = T("close");
    x.addEventListener("click", ()=>{
      try{ localStorage.setItem(DISMISS_KEY, String(a.id)); }catch(e){}
      banner.remove(); banner = null;
    });
    banner.appendChild(x);
    document.body.appendChild(banner);
  }

  /* ---- welkomstwoord op het inlogscherm -------------------------------------- */
  function renderWelcome(){
    let box = document.getElementById("cmsWelcome");
    const text = inLang(CMS.welcome);
    if(!text){ if(box) box.remove(); return; }
    if(!box){
      box = cmsEl("div");
      box.id = "cmsWelcome";
      document.querySelector("#loginModal .login-logo").after(box);
    }
    box.textContent = text;
  }
  document.addEventListener("langchange", ()=>{ renderAnnouncement(); renderWelcome(); });

  /* ---- Inhoud-sectie in Instellingen (alleen systeemmanager) ----------------- */
  const host = cmsEl("div", "st-section");
  host.dataset.section = "inhoud";
  host.style.display = "none";
  document.getElementById("stContent").appendChild(host);

  async function save(key, value, msgEl){
    try{
      await api("/admin/content/"+key, { method:"PUT", body:value });
      CMS[key] = value;
      msgEl.textContent = T("cmsSaved");
      msgEl.classList.add("ok");
      renderAnnouncement();
      renderWelcome();
      document.dispatchEvent(new CustomEvent("cmschange"));
    }catch(e){
      msgEl.textContent = e.message;
      msgEl.classList.remove("ok");
    }
  }
  const langArea = (labelKey, value)=>{
    const wrap = cmsEl("label", "cms-field");
    wrap.appendChild(cmsEl("span", "am-field-lbl", T(labelKey)));
    const ta = document.createElement("textarea");
    ta.className = "am-inp cms-ta";
    ta.maxLength = 2000;
    ta.value = value || "";
    ta.addEventListener("keydown", ev=>ev.stopPropagation());
    wrap.appendChild(ta);
    wrap._ta = ta;
    return wrap;
  };

  function renderPanel(){
    host.innerHTML = "";

    /* welkomstwoord */
    host.appendChild(cmsEl("div", "am-h3", T("cmsWelcomeH")));
    const wMsg = cmsEl("div", "formMsg");
    const wNl = langArea("cmsNl", CMS.welcome && CMS.welcome.nl);
    const wEn = langArea("cmsEn", CMS.welcome && CMS.welcome.en);
    const wSave = cmsEl("button", "am-btn", T("save"));
    wSave.type = "button";
    wSave.addEventListener("click", ()=>save("welcome", { nl: wNl._ta.value.trim(), en: wEn._ta.value.trim() }, wMsg));
    const wBlock = cmsEl("div", "am-reset cms-block");
    [wNl, wEn, wSave, wMsg].forEach(n=>wBlock.appendChild(n));
    host.appendChild(wBlock);

    /* update-melding */
    host.appendChild(cmsEl("div", "am-h3", T("cmsAnnounceH")));
    const a = CMS.announcement || {};
    const aMsg = cmsEl("div", "formMsg");
    const activeLbl = cmsEl("label", "cms-check");
    const active = document.createElement("input");
    active.type = "checkbox";
    active.checked = !!a.active;
    activeLbl.appendChild(active);
    activeLbl.appendChild(cmsEl("span", null, " " + T("cmsActive")));
    const level = document.createElement("select");
    level.className = "am-sel";
    level.appendChild(new Option(T("cmsLevelInfo"), "info"));
    level.appendChild(new Option(T("cmsLevelWarn"), "warn"));
    level.value = a.level === "warn" ? "warn" : "info";
    const aNl = langArea("cmsNl", a.nl);
    const aEn = langArea("cmsEn", a.en);
    const aSave = cmsEl("button", "am-btn", T("save"));
    aSave.type = "button";
    aSave.addEventListener("click", ()=>{
      /* nieuw id per wijziging: weggeklikte meldingen verschijnen dan opnieuw */
      save("announcement", { active: active.checked, level: level.value,
        nl: aNl._ta.value.trim(), en: aEn._ta.value.trim(), id: Date.now() }, aMsg);
    });
    const aBlock = cmsEl("div", "am-reset cms-block");
    const aRow = cmsEl("div", "cms-row");
    aRow.appendChild(activeLbl);
    aRow.appendChild(level);
    [aRow, aNl, aEn, aSave, aMsg].forEach(n=>aBlock.appendChild(n));
    host.appendChild(aBlock);

    /* widget-uitleg */
    host.appendChild(cmsEl("div", "am-h3", T("cmsWidgetH")));
    const gBlock = cmsEl("div", "am-reset cms-block");
    const gMsg = cmsEl("div", "formMsg");
    const pick = document.createElement("select");
    pick.className = "am-sel";
    pick.appendChild(new Option(T("cmsWidgetPick"), ""));
    REGISTRY.forEach(def=>pick.appendChild(new Option(T("wg_"+def.id), def.id)));
    const editor = cmsEl("div");
    editor.style.display = "none";
    pick.addEventListener("change", ()=>{
      editor.innerHTML = "";
      gMsg.textContent = "";
      if(!pick.value){ editor.style.display = "none"; return; }
      const id = pick.value;
      const cur = (CMS.widgetInfo || {})[id] || {};
      const gNl = langArea("cmsNl", cur.nl);
      const gEn = langArea("cmsEn", cur.en);
      gNl._ta.placeholder = I18N.nl["wg_"+id+"_d"] || "";
      gEn._ta.placeholder = I18N.en["wg_"+id+"_d"] || "";
      const hint = cmsEl("div", "guestnote", T("cmsWidgetHint"));
      const gSave = cmsEl("button", "am-btn", T("save"));
      gSave.type = "button";
      gSave.addEventListener("click", ()=>{
        const info = { ...(CMS.widgetInfo || {}) };
        const nl = gNl._ta.value.trim(), en = gEn._ta.value.trim();
        if(nl || en) info[id] = { nl, en };
        else delete info[id];
        save("widgetInfo", info, gMsg);
      });
      [gNl, gEn, hint, gSave].forEach(n=>editor.appendChild(n));
      editor.style.display = "";
    });
    gBlock.appendChild(pick);
    gBlock.appendChild(editor);
    gBlock.appendChild(gMsg);
    host.appendChild(gBlock);

    /* systeembrede inhoud: ankerdiagrammen/borden en afbeeldingen */
    host.appendChild(cmsEl("div", "am-h3", T("cmsShortcutsH")));
    const sBlock = cmsEl("div", "am-reset cms-block");
    sBlock.appendChild(cmsEl("div", "guestnote", T("cmsShortcutsHint")));
    const shared = cmsEl("button", "tbtn ghost", T("cmsOpenShared"));
    shared.type = "button";
    shared.addEventListener("click", ()=>{
      document.getElementById("settingsWrap").classList.remove("open");
      document.getElementById("btnFolders").click();
    });
    const imgs = cmsEl("button", "tbtn ghost", T("cmsOpenImages"));
    imgs.type = "button";
    imgs.addEventListener("click", ()=>{
      document.getElementById("settingsWrap").classList.remove("open");
      openImageCatalog();
    });
    const sRow = cmsEl("div", "cms-row");
    sRow.appendChild(shared);
    sRow.appendChild(imgs);
    sBlock.appendChild(sRow);
    host.appendChild(sBlock);
  }

  registerSettingsSection({
    id:"inhoud", icon:"📢", group:"system", order:31,
    label:()=>T("stInhoud"), sub:()=>T("stInhoudSub"),
    visible:()=>!!currentUser && can("content.manage"),
    activate(){
      renderPanel();
      showSettingsDom("inhoud");
    },
    keywords:()=>[T("cmsWelcomeH"), T("cmsAnnounceH"), T("cmsWidgetH"),
      "welkom","welcome","melding","announcement","banner","uitleg","cms","tekst","text"],
  });

  loadContent();
})();