// Logik der Einstellungsseite.

const $ = (id) => document.getElementById(id);
// Passwort ist bewusst NICHT dabei – es wird nie gespeichert, nur zum Testen/Login
// transient verwendet (siehe "Verbindung testen").
const FIELDS = ["serverUrl", "organization", "username"];
const CHECKS = ["storeAttachments", "tagOnSuccess"];

function setStatus(msg, kind) {
  const el = $("status");
  el.textContent = msg;
  el.className = kind || "";
}

async function load() {
  const s = await Settings.get();
  FIELDS.forEach((f) => ($(f).value = s[f] || ""));
  CHECKS.forEach((c) => ($(c).checked = !!s[c]));
  setMailFormat(s.mailFormat === "pdf" ? "pdf" : "eml");
  loadMapping(s.fieldMapping && Object.keys(s.fieldMapping).length ? s.fieldMapping : DEFAULT_FIELD_MAP);
  // Schrankliste, falls vorher schon getestet (im Storage gecached)
  const cached = (await browser.storage.local.get("cabinets")).cabinets || [];
  fillCabinets(cached, s.defaultCabinetId);
}

function setMailFormat(v) {
  const el = document.querySelector(`input[name="mailFormat"][value="${v}"]`);
  if (el) el.checked = true;
}
function getMailFormat() {
  const el = document.querySelector('input[name="mailFormat"]:checked');
  return el ? el.value : "eml";
}

function fillCabinets(cabinets, selectedId) {
  // Standard-Ziel (Archive + Briefkörbe)
  const sel = $("defaultCabinet");
  sel.innerHTML = '<option value="">— keiner —</option>';
  const addGroup = (label, list) => {
    if (!list.length) return;
    const g = document.createElement("optgroup");
    g.label = label;
    list.forEach((c) => {
      const o = document.createElement("option");
      o.value = c.id;
      o.textContent = c.name;
      if (String(c.id) === String(selectedId)) o.selected = true;
      g.appendChild(o);
    });
    sel.appendChild(g);
  };
  addGroup("Archive", cabinets.filter((c) => !c.isBasket));
  addGroup("Briefkörbe", cabinets.filter((c) => c.isBasket));

  // Mapping-Helfer: nur Archive (Briefkörbe haben keine Indexfelder).
  const mc = $("mapCabinet");
  const keep = mc.value;
  mc.innerHTML = '<option value="">Feldnamen aus Archiv vorschlagen …</option>';
  cabinets.filter((c) => !c.isBasket).forEach((c) => {
    const o = document.createElement("option");
    o.value = c.id;
    o.textContent = c.name;
    mc.appendChild(o);
  });
  if (keep) mc.value = keep;
}

// Besorgt einen Sitzungs-Token: vorhandenen vom Broker nutzen, sonst mit dem
// (transienten) Passwortfeld anmelden. Liefert false, wenn kein Passwort da ist.
async function ensureToken() {
  const st = await browser.runtime.sendMessage({ type: "auth:status" });
  if (st && st.hasToken && st.token) { Auth.setToken(st.token); return true; }
  const pw = $("password").value;
  if (!pw) return false;
  const res = await browser.runtime.sendMessage({ type: "auth:logon", password: pw });
  if (!res || !res.ok) throw new Error(res && res.error ? res.error : "Anmeldung fehlgeschlagen.");
  Auth.setToken(res.token);
  $("password").value = ""; // Passwort nicht behalten
  return true;
}

// --- Feld-Mapping-Editor ---------------------------------------------------

function addMapRow(field = "", token = "") {
  const tr = document.createElement("tr");

  const inp = document.createElement("input");
  inp.type = "text"; inp.className = "map-field"; inp.value = field;
  inp.placeholder = "EML_SUBJECT";
  inp.setAttribute("list", "fieldNames"); // Vorschläge aus gewähltem Archiv
  const tdF = document.createElement("td"); tdF.appendChild(inp);

  const sel = document.createElement("select"); sel.className = "map-token";
  const none = document.createElement("option"); none.value = ""; none.textContent = "— nichts —";
  sel.appendChild(none);
  MAIL_TOKENS.forEach((t) => {
    const o = document.createElement("option");
    o.value = t.key; o.textContent = t.label;
    if (t.key === token) o.selected = true;
    sel.appendChild(o);
  });
  const tdT = document.createElement("td"); tdT.appendChild(sel);

  const del = document.createElement("button");
  del.type = "button"; del.className = "icon-btn"; del.textContent = "✕"; del.title = "Zeile entfernen";
  del.addEventListener("click", () => tr.remove());
  const tdX = document.createElement("td"); tdX.className = "del"; tdX.appendChild(del);

  tr.append(tdF, tdT, tdX);
  $("mapBody").appendChild(tr);
}

function loadMapping(map) {
  $("mapBody").innerHTML = "";
  Object.entries(map || {}).forEach(([f, t]) => addMapRow(f, t));
}

function collectMapping() {
  const map = {};
  document.querySelectorAll("#mapBody tr").forEach((tr) => {
    const f = tr.querySelector(".map-field").value.trim();
    const t = tr.querySelector(".map-token").value;
    if (f && t) map[f] = t; // leere Feldnamen/Token ignorieren
  });
  return map;
}

function collect() {
  const partial = {};
  FIELDS.forEach((f) => (partial[f] = $(f).value.trim()));
  CHECKS.forEach((c) => (partial[c] = $(c).checked));
  partial.defaultCabinetId = $("defaultCabinet").value;
  partial.mailFormat = getMailFormat();
  partial.fieldMapping = collectMapping();
  return partial;
}

// --- Events ----------------------------------------------------------------

$("save").addEventListener("click", async () => {
  await Settings.set(collect());
  setStatus("Gespeichert.", "ok");
});

$("test").addEventListener("click", async () => {
  setStatus("Verbinde …");
  try {
    const s = await Settings.set(collect()); // erst speichern (ohne Passwort), dann testen
    const ok = await ensureToken();
    if (!ok) { setStatus("Bitte Passwort eingeben.", "err"); return; }
    const cabinets = await DocuWare.listCabinets(s);
    await browser.storage.local.set({ cabinets });
    fillCabinets(cabinets, s.defaultCabinetId);
    const arch = cabinets.filter((c) => !c.isBasket).length;
    const bk = cabinets.filter((c) => c.isBasket).length;
    setStatus(`Verbindung ok – ${arch} Archive, ${bk} Briefkörbe gefunden.`, "ok");
  } catch (e) {
    setStatus(`Fehler: ${e.message}`, "err");
  }
});

$("mapAdd").addEventListener("click", () => addMapRow());
$("mapReset").addEventListener("click", () => loadMapping(DEFAULT_FIELD_MAP));

// Archiv wählen -> dessen Indexfelder als Vorschläge (datalist) für alle Feldnamen.
$("mapCabinet").addEventListener("change", async () => {
  const id = $("mapCabinet").value;
  const dl = $("fieldNames");
  const st = $("mapFieldStatus");
  if (!id) { dl.innerHTML = ""; st.textContent = ""; return; }
  st.textContent = "Lade Felder …";
  try {
    const s = await Settings.get();
    const ok = await ensureToken();
    if (!ok) { st.textContent = "Erst „Verbindung testen“ (Passwort nötig)."; return; }
    const names = (await DocuWare.cabinetFieldNames(s, id))
      .filter((n) => n && !/^DW[A-Z]/.test(n)); // DW*-Systemfelder ausblenden
    dl.innerHTML = "";
    names.sort().forEach((n) => {
      const o = document.createElement("option");
      o.value = n;
      dl.appendChild(o);
    });
    st.textContent = `${names.length} Felder als Vorschlag geladen.`;
  } catch (e) {
    st.textContent = `Fehler: ${e.message}`;
  }
});

load();