// Ablage-Dialog: Schrankwahl, dynamische Felder, Upload.

const $ = (id) => document.getElementById(id);

let STATE = {
  messageId: null,
  messageIds: [],  // alle ausgewählten Nachrichten
  settings: null,
  meta: null,
  attachments: [],
  cabinets: [],   // alle Ziele (Archive + Briefkörbe)
  cabinetId: "",
  isBasket: false, // gewähltes Ziel ist ein Briefkorb?
  dialogId: null,
  fields: [], // Felddefinitionen des Store-Dialogs
};

// Mapping DocuWare-Feldname -> Funktion, die einen Vorbefüllwert aus meta liefert.
const PREFILL = {
  EML_SENDER: (m) => m.senderEmail,
  EML_SENDER_DISPLAYNAME: (m) => m.senderName,
  EML_SENDER_NAME: (m) => m.senderName,
  EML_RECEIVER: (m) => m.to,
  EML_CC: (m) => m.cc,
  EML_BCC: (m) => m.bcc,
  EML_SUBJECT: (m) => m.subject,
  DOC_SUBJECT: (m) => m.subject,
  EML_BODY: (m) => m.bodyText,
  EML_SENDINGDATE: (m) => m.date,
  EML_DISPLAYDATE: (m) => m.date,
  EML_RECEIVINGDATE: (m) => m.date,
  EML_DIRECTION: (m) => m.direction,
  EML_SIZE: (m) => m.sizeBytes,
  EML_ACCOUNT: (m) => m.account,
  DOC_DATE: (m) => m.date,
  // Naheliegende generische Feldnamen (Schränke ohne EML_*-Schema)
  SUBJECT: (m) => m.subject,
  BETREFF: (m) => m.subject,
  EMAIL: (m) => m.senderEmail,
  E_MAIL: (m) => m.senderEmail,
  DATE: (m) => m.date,
  DATUM: (m) => m.date,
};

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

function qs(name) {
  return new URLSearchParams(location.search).get(name);
}

async function init() {
  // messageIds (Mehrfachauswahl) bevorzugt, sonst einzelnes messageId.
  const idsParam = qs("messageIds");
  STATE.messageIds = (idsParam ? idsParam.split(",") : [qs("messageId")])
    .map((x) => parseInt(x, 10))
    .filter((n) => !isNaN(n));
  STATE.messageId = STATE.messageIds[0];
  STATE.settings = await Settings.get();

  if (!STATE.settings.serverUrl) {
    status("Bitte zuerst in den Einstellungen Server & Login hinterlegen.", "err");
    $("submit").disabled = true;
    return;
  }

  try {
    // Anzeige/Vorbefüllung anhand der ersten Nachricht.
    STATE.meta = await Mail.getMeta(STATE.messageId);
    STATE.attachments = await Mail.listAttachments(STATE.messageId);
  } catch (e) {
    status(`Mail konnte nicht gelesen werden: ${e.message}`, "err");
    return;
  }

  if (STATE.messageIds.length > 1) {
    $("multiNote").textContent =
      `${STATE.messageIds.length} E-Mails werden abgelegt. ` +
      "Eingetragene Werte gelten für alle; Absender/Betreff/Datum werden je E-Mail einzeln übernommen.";
  }

  renderAttachments();
  applyDefaults();

  try {
    status("Verbinde mit DocuWare …");
    await Auth.logon(STATE.settings);
    await loadCabinets();
    status("");
  } catch (e) {
    status(`Verbindung fehlgeschlagen: ${e.message}`, "err");
  }
}

function applyDefaults() {
  $("optPdf").checked = STATE.settings.storePdf;
  const hasAtt = STATE.attachments.length > 0;
  // Standard-Umfang aus den Einstellungen ableiten.
  let scope = "both";
  if (STATE.settings.storeEml && !STATE.settings.storeAttachments) scope = "eml";
  else if (!STATE.settings.storeEml && STATE.settings.storeAttachments) scope = "att";
  if (!hasAtt) scope = "eml"; // ohne Anhänge nur E-Mail sinnvoll
  setScope(scope);
  // Optionen, die Anhänge erfordern, deaktivieren wenn keine vorhanden.
  document.querySelectorAll('input[name="scope"]').forEach((r) => {
    if ((r.value === "att" || r.value === "both") && !hasAtt) r.disabled = true;
  });
}

function setScope(value) {
  const el = document.querySelector(`input[name="scope"][value="${value}"]`);
  if (el) el.checked = true;
}

function getScope() {
  const el = document.querySelector('input[name="scope"]:checked');
  return el ? el.value : "both";
}

function renderAttachments() {
  const ul = $("attList");
  ul.innerHTML = "";
  STATE.attachments.forEach((a, i) => {
    const li = document.createElement("li");
    li.innerHTML =
      `<input type="checkbox" id="att-${i}" checked /> ` +
      `<label for="att-${i}" style="margin:0;font-weight:400">${a.name} ` +
      `<span class="muted">(${formatSize(a.size)})</span></label>`;
    ul.appendChild(li);
  });
}

async function loadCabinets() {
  let cabinets = (await browser.storage.local.get("cabinets")).cabinets;
  if (!cabinets || cabinets.length === 0) {
    cabinets = await DocuWare.listCabinets(STATE.settings);
    await browser.storage.local.set({ cabinets });
  }
  STATE.cabinets = cabinets;

  const sel = $("cabinet");
  sel.innerHTML = '<option value="">— bitte wählen —</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;
      g.appendChild(o);
    });
    sel.appendChild(g);
  };
  addGroup("Archive", cabinets.filter((c) => !c.isBasket));
  addGroup("Briefkörbe", cabinets.filter((c) => c.isBasket));

  if (STATE.settings.defaultCabinetId) {
    sel.value = STATE.settings.defaultCabinetId;
    if (sel.value) await onCabinetChange();
  }
}

async function onCabinetChange() {
  STATE.cabinetId = $("cabinet").value;
  STATE.dialogId = null;
  STATE.fields = [];
  const target = STATE.cabinets.find((c) => String(c.id) === String(STATE.cabinetId));
  STATE.isBasket = !!(target && target.isBasket);
  $("cabHeading").textContent = target ? `Ablegen in „${target.name}"` : "Ablage";

  // Sticky: zuletzt gewählten Schrank als Standard merken.
  if (STATE.cabinetId) {
    Settings.set({ defaultCabinetId: STATE.cabinetId }).then((s) => (STATE.settings = s));
  }

  if (!STATE.cabinetId) {
    $("fields").innerHTML = '<div class="muted">Ziel wählen …</div>';
    return;
  }
  // Briefkörbe haben keinen Store-Dialog -> keine Indexfelder.
  $("dialogRow").style.display = "none";
  if (STATE.isBasket) {
    $("fields").innerHTML =
      '<div class="muted">Briefkorb: keine Indexfelder. Die Dokumente werden ' +
      "unindiziert im Briefkorb abgelegt und können dort später archiviert werden.</div>";
    return;
  }
  $("fields").innerHTML = '<div class="muted">Lade Ablagedialog …</div>';
  try {
    const cands = await DocuWare.listFieldsDialogs(STATE.settings, STATE.cabinetId);
    STATE.dialogCands = cands;
    if (!cands.length) throw new Error("Kein Store- oder Suchdialog für diesen Schrank gefunden.");

    // Auswahl-Dropdown nur zeigen, wenn es mehrere Dialoge gibt.
    const ds = $("storeDialog");
    ds.innerHTML = "";
    cands.forEach((c) => {
      const o = document.createElement("option");
      o.value = c.id;
      o.textContent = c.type === "search" ? `${c.name} (Suchdialog)` : c.name;
      ds.appendChild(o);
    });
    $("dialogRow").style.display = cands.length > 1 ? "grid" : "none";

    // Gemerkte Wahl pro Schrank, sonst erster Dialog.
    const remembered = (STATE.settings.dialogByCabinet || {})[STATE.cabinetId];
    const pick = cands.find((c) => c.id === remembered) || cands[0];
    ds.value = pick.id;
    await loadDialogFields(pick);
  } catch (e) {
    $("fields").innerHTML = `<div class="err">${e.message}</div>`;
  }
}

// Lädt und rendert die Felder für einen konkreten Dialog.
async function loadDialogFields(pick) {
  STATE.dialogId = pick.id;
  STATE.dialogType = pick.type;
  STATE.fields = [];
  $("fields").innerHTML = '<div class="muted">Lade Felder …</div>';
  STATE.fields = await DocuWare.getStoreFields(STATE.settings, STATE.cabinetId, STATE.dialogId);
  renderFields();
  if (pick.type === "search") {
    const note = document.createElement("div");
    note.className = "muted";
    note.style.marginTop = "6px";
    note.textContent =
      "Hinweis: Kein Store-Dialog verfügbar – Felder stammen aus dem Suchdialog.";
    $("fields").appendChild(note);
  }
}

// Nutzer wählt einen anderen Ablagedialog -> merken (pro Schrank) und neu laden.
async function onStoreDialogChange() {
  const id = $("storeDialog").value;
  const pick = (STATE.dialogCands || []).find((c) => c.id === id);
  if (!pick) return;
  const map = { ...(STATE.settings.dialogByCabinet || {}), [STATE.cabinetId]: id };
  STATE.settings = await Settings.set({ dialogByCabinet: map });
  try {
    await loadDialogFields(pick);
  } catch (e) {
    $("fields").innerHTML = `<div class="err">${e.message}</div>`;
  }
}

function renderFields() {
  const container = $("fields");
  container.innerHTML = "";
  for (const f of STATE.fields) {
    const wrap = document.createElement("div");
    wrap.className = "field" + (isMemo(f) ? " full" : "");
    wrap.dataset.name = f.name;
    wrap.dataset.type = f.type;
    wrap.dataset.required = f.required ? "1" : "";

    const label = document.createElement("label");
    label.textContent = f.label;
    if (f.required) {
      const r = document.createElement("span");
      r.className = "req"; r.textContent = " *";
      label.appendChild(r);
    }
    wrap.appendChild(label);

    const input = buildInput(f);
    wrap.appendChild(input);
    if (input._datalist) wrap.appendChild(input._datalist);
    container.appendChild(wrap);
  }
  applyFieldDefaults(); // vordefinierte Werte (PrefillValue) zuerst
  prefillFields();      // Mail-Vorbefüllung überschreibt gemappte Felder
  populateSelectLists(); // Auswahllisten/Vorschläge asynchron nachladen
}

// Baut das Eingabe-Element (synchron). Auswahllisten werden später befüllt.
function buildInput(f) {
  const t = (f.type || "").toLowerCase();
  let el;
  if (isMemo(f)) {
    el = document.createElement("textarea");
  } else if (f.isSelectList && f.selectListOnly) {
    // Nur Listenwerte erlaubt -> starres Dropdown.
    el = document.createElement("select");
    el.innerHTML = '<option value=""></option>';
  } else if (t.includes("date")) {
    el = document.createElement("input");
    el.type = "date";
  } else if (t.includes("decimal") || t.includes("numeric") || t.includes("int")) {
    el = document.createElement("input");
    el.type = "number"; el.step = "any";
  } else {
    el = document.createElement("input");
    el.type = "text";
    if (f.isSelectList) {
      // Combobox: frei tippbar mit Vorschlagsliste (wie in Connect-to-Outlook).
      const dl = document.createElement("datalist");
      dl.id = "dl-" + f.name;
      el.setAttribute("list", dl.id);
      el._datalist = dl;
    }
  }
  el.dataset.role = "value";
  if (f.readOnly && el.tagName !== "SELECT") el.readOnly = true;
  return el;
}

// Vordefinierte Werte (PrefillValue aus dem Dialog) eintragen.
function applyFieldDefaults() {
  STATE.fields.forEach((f) => {
    if (f.prefill === undefined || f.prefill === null || f.prefill === "") return;
    setFieldValue(f.name, f, f.prefill);
  });
}

function prefillFields() {
  STATE.fields.forEach((f) => {
    const fn = PREFILL[f.name];
    if (!fn) return;
    const val = fn(STATE.meta);
    if (val === undefined || val === null || val === "") return;
    setFieldValue(f.name, f, val);
  });
}

// Setzt einen Wert auf das Control eines Feldes (kümmert sich um Datum/Select).
function setFieldValue(name, f, val) {
  const wrap = document.querySelector(`.field[data-name="${name}"]`);
  const el = wrap && wrap.querySelector("[data-role='value']");
  if (!el) return;
  if (el.type === "date") {
    const d = val instanceof Date ? val : new Date(val);
    if (!isNaN(d)) el.value = toDateInput(d);
  } else if (el.tagName === "SELECT") {
    let opt = Array.from(el.options).find((o) => o.value === String(val));
    if (!opt) {
      opt = document.createElement("option");
      opt.value = String(val); opt.textContent = String(val);
      el.appendChild(opt);
    }
    el.value = String(val);
  } else {
    el.value = val instanceof Date ? toDateInput(val) : String(val);
  }
  wrap.classList.add("prefilled");
}

// Lädt die Auswahllisten-Werte und füllt Dropdowns/Vorschlagslisten.
async function populateSelectLists() {
  for (const f of STATE.fields) {
    if (!f.isSelectList) continue;
    let vals = [];
    try {
      vals = await DocuWare.getSelectList(
        STATE.settings, STATE.cabinetId, STATE.dialogId, f.name
      );
    } catch (_) { /* leere Liste ist ok */ }
    if (!vals.length) continue;
    const wrap = document.querySelector(`.field[data-name="${f.name}"]`);
    const el = wrap && wrap.querySelector("[data-role='value']");
    if (!el) continue;
    if (el.tagName === "SELECT") {
      const current = el.value;
      vals.forEach((v) => {
        if (!Array.from(el.options).some((o) => o.value === v)) {
          const o = document.createElement("option");
          o.value = v; o.textContent = v;
          el.appendChild(o);
        }
      });
      if (current) el.value = current;
    } else {
      const dl = el._datalist || document.getElementById(el.getAttribute("list"));
      if (dl) {
        dl.innerHTML = "";
        vals.forEach((v) => {
          const o = document.createElement("option");
          o.value = v;
          dl.appendChild(o);
        });
      }
    }
  }
}

function collectFieldValues() {
  const result = {};
  let firstInvalid = null;
  document.querySelectorAll(".field").forEach((wrap) => {
    wrap.classList.remove("invalid");
    const el = wrap.querySelector("[data-role='value']");
    const name = wrap.dataset.name;
    const type = wrap.dataset.type;
    const required = wrap.dataset.required === "1";
    const raw = el ? el.value : "";
    if (required && !String(raw).trim()) {
      wrap.classList.add("invalid");
      if (!firstInvalid) firstInvalid = name;
    }
    if (String(raw).trim() !== "") {
      result[name] = { value: el.type === "date" ? new Date(raw) : raw, type };
    }
  });
  return { result, firstInvalid };
}

async function submit() {
  if (!STATE.cabinetId) { status("Bitte ein Ziel wählen.", "err"); return; }
  let result = {};
  if (!STATE.isBasket) {
    const collected = collectFieldValues();
    if (collected.firstInvalid) {
      status(`Pflichtfeld fehlt: ${collected.firstInvalid}`, "err");
      return;
    }
    result = collected.result;
  }

  const scope = getScope();
  const wantEml = scope !== "att";
  const wantPdf = $("optPdf").checked;
  const wantAttScope = scope !== "eml";

  if (!wantEml && !wantAttScope) {
    status("Nichts ausgewählt zum Ablegen.", "err");
    return;
  }

  await saveOptionPrefs(scope, wantPdf); // Sticky: Umfang merken

  $("submit").disabled = true;
  const multi = STATE.messageIds.length > 1;
  let tagFailed = false;
  try {
    let mi = 0;
    for (const mid of STATE.messageIds) {
      mi++;
      const prefix = multi ? `Mail ${mi}/${STATE.messageIds.length}: ` : "";
      // Meta/Anhänge der jeweiligen Nachricht.
      const meta = mid === STATE.messageId ? STATE.meta : await Mail.getMeta(mid);
      const atts =
        mid === STATE.messageId ? STATE.attachments : await Mail.listAttachments(mid);

      // Indexfelder: manuelle Werte für alle gleich; gemappte Felder je Mail neu.
      const fields = STATE.isBasket ? {} : fieldsForMessage(result, meta, multi);
      const wantAtt = wantAttScope && atts.length > 0;

      if (wantEml) {
        status(`${prefix}E-Mail …`);
        const eml = await Mail.getEmlFile(mid, meta.subject);
        await DocuWare.uploadDocument(STATE.settings, STATE.cabinetId, eml, eml.name, fields);
      }
      if (wantPdf) {
        status(`${prefix}PDF …`);
        const pdf = Pdf.fromMail(meta);
        await DocuWare.uploadDocument(STATE.settings, STATE.cabinetId, pdf, pdf.name, fields);
      }
      if (wantAtt) {
        // Bei Einzelmail: angehakte Anhänge. Bei Mehrfach: alle Anhänge je Mail.
        const indices = multi ? atts.map((_, i) => i) : selectedAttachmentIndices();
        for (const i of indices) {
          const a = atts[i];
          if (!a) continue;
          status(`${prefix}Anhang ${a.name} …`);
          const file = await Mail.getAttachmentFile(mid, a.partName);
          const af = STATE.isBasket ? {} : { ...fields, DOC_FILE_NAME: { value: a.name, type: "Text" } };
          await DocuWare.uploadDocument(STATE.settings, STATE.cabinetId, file, a.name, af);
        }
      }

      if (STATE.settings.tagOnSuccess) {
        try { await tagMessage(mid); }
        catch (te) { console.warn("DocuWare-Markierung fehlgeschlagen:", te); tagFailed = true; }
      }
    }

    const base = multi ? `${STATE.messageIds.length} E-Mails abgelegt.` : "Erfolgreich abgelegt.";
    status(tagFailed ? `${base} (Markierung nicht möglich)` : base, "ok");
    setTimeout(() => window.close(), tagFailed ? 2500 : 1200);
  } catch (e) {
    status(`Fehler beim Ablegen: ${e.message}`, "err");
    $("submit").disabled = false;
  }
}

// Indexfelder für eine konkrete Nachricht: gemappte Felder (EML_*/generisch)
// werden je Mail aus deren Metadaten neu berechnet, manuelle Werte bleiben.
function fieldsForMessage(baseResult, meta, multi) {
  if (!multi) return baseResult; // Einzelmail: manuelle Edits respektieren
  const result = { ...baseResult };
  STATE.fields.forEach((f) => {
    const fn = PREFILL[f.name];
    if (!fn) return;
    const val = fn(meta);
    if (val === undefined || val === null || val === "") return;
    result[f.name] = { value: val, type: f.type };
  });
  return result;
}

// Sticky: zuletzt genutzten Ablage-Umfang in den Einstellungen merken.
async function saveOptionPrefs(scope, wantPdf) {
  const storeEml = scope !== "att";
  const storeAttachments = scope !== "eml";
  try {
    STATE.settings = await Settings.set({ storeEml, storeAttachments, storePdf: wantPdf });
  } catch (_) { /* nicht kritisch */ }
}

function selectedAttachmentIndices() {
  return STATE.attachments
    .map((_, i) => i)
    .filter((i) => { const c = $(`att-${i}`); return c && c.checked; });
}

// Markiert die Mail mit dem Tag "DocuWare". Wirft bei Fehler (Aufrufer fängt).
async function tagMessage(messageId) {
  const KEY = "docuware";
  const NAME = "DocuWare";
  const COLOR = "#0e8a8a";
  // Tags-API unterscheidet sich je nach Thunderbird-Version.
  const api = browser.messages.tags;
  let list = [];
  if (api && api.list) list = await api.list();
  else if (browser.messages.listTags) list = await browser.messages.listTags();

  let tag = list.find((t) => t.key === KEY || t.tag === NAME);
  if (!tag) {
    if (api && api.create) await api.create(KEY, NAME, COLOR);
    else if (browser.messages.createTag) await browser.messages.createTag(KEY, NAME, COLOR);
    tag = { key: KEY };
  }
  const msg = await browser.messages.get(messageId);
  const current = msg.tags || [];
  if (!current.includes(tag.key)) {
    await browser.messages.update(messageId, { tags: [...current, tag.key] });
  }
}

// --- Helfer ---
const isMemo = (f) => /memo/i.test(f.type) || f.name === "EML_BODY";
const toDateInput = (d) => d.toISOString().slice(0, 10);
function formatSize(b) {
  if (!b) return "–";
  if (b < 1024) return `${b} B`;
  if (b < 1024 * 1024) return `${(b / 1024).toFixed(0)} KB`;
  return `${(b / 1024 / 1024).toFixed(1)} MB`;
}

function resetForm() {
  document.querySelectorAll(".field").forEach((wrap) => {
    const el = wrap.querySelector("[data-role='value']");
    if (el) el.value = "";
    wrap.classList.remove("prefilled", "invalid");
  });
  applyFieldDefaults();
  prefillFields();
  applyDefaults();
  status("");
}

$("cabinet").addEventListener("change", onCabinetChange);
$("storeDialog").addEventListener("change", onStoreDialogChange);
$("submit").addEventListener("click", submit);
$("reset").addEventListener("click", resetForm);
$("cancel").addEventListener("click", () => window.close());

// Sticky: Optionen sofort bei Änderung merken (nicht erst beim Ablegen).
document.querySelectorAll('input[name="scope"]').forEach((r) =>
  r.addEventListener("change", () => saveOptionPrefs(getScope(), $("optPdf").checked))
);
$("optPdf").addEventListener("change", () =>
  saveOptionPrefs(getScope(), $("optPdf").checked)
);

init();