fix: invoice edit/list improvements

- Due date uses days selector in edit mode (same as create)
- Overdue invoices fully editable (same as issued)
- Overdue status reversed to issued when due date moved to future
- Invoice list: edit icon for issued/overdue, eye for paid
- Invoice list: PDF opens blob from NAS (removed lang modal)
- NAS cleanup: properly scans directories when cleaning old PDFs
- Fixed syntax error from leftover else block

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/admin/pages/InvoiceDetail.tsx

@@ -615,6 +615,16 @@ export default function InvoiceDetail() {
           bank_account: inv.bank_account || "",
         });
 
+        // Calculate dueDays from existing dates
+        if (inv.issue_date && inv.due_date) {
+          const issue = new Date(inv.issue_date);
+          const due = new Date(inv.due_date);
+          const diffDays = Math.round(
+            (due.getTime() - issue.getTime()) / (1000 * 60 * 60 * 24),
+          );
+          if (diffDays > 0 && diffDays <= 60) setDueDays(diffDays);
+        }
+
         // Populate items from existing invoice
         if (inv.items?.length > 0) {
           setItems(
@@ -645,14 +655,13 @@ export default function InvoiceDetail() {
     if (isEdit) fetchDetail();
   }, [isEdit, fetchDetail]);
 
-  // ─── Create mode: due date calculation ───
+  // ─── Due date calculation from issue date + days ───
   useEffect(() => {
-    if (isEdit) return;
     if (!form.issue_date) return;
     const d = new Date(form.issue_date);
     d.setDate(d.getDate() + dueDays);
     setForm((prev) => ({ ...prev, due_date: d.toISOString().split("T")[0] }));
-  }, [isEdit, form.issue_date, dueDays]);
+  }, [form.issue_date, dueDays]);
 
   // ─── Create mode: customer filtering ───
   const filteredCustomers = useMemo(() => {
@@ -1540,37 +1549,25 @@ export default function InvoiceDetail() {
                   }}
                 />
               </FormField>
-              {!isEdit ? (
-                <FormField label="Splatnost (dny)">
-                  <select
-                    value={dueDays}
-                    onChange={(e) => setDueDays(Number(e.target.value))}
-                    className="admin-form-select"
-                  >
-                    {Array.from({ length: 60 }, (_, i) => i + 1).map((n) => (
-                      <option key={n} value={n}>
-                        {n}
-                      </option>
-                    ))}
-                  </select>
-                  {form.due_date && (
-                    <span className="text-tertiary text-xs mt-1">
-                      Splatnost:{" "}
-                      {new Date(form.due_date).toLocaleDateString("cs-CZ")}
-                    </span>
-                  )}
-                </FormField>
-              ) : (
-                <FormField label="Datum splatnosti">
-                  <AdminDatePicker
-                    mode="date"
-                    value={form.due_date}
-                    onChange={(val: string) => {
-                      setForm((prev) => ({ ...prev, due_date: val }));
-                    }}
-                  />
-                </FormField>
-              )}
+              <FormField label="Splatnost (dny)">
+                <select
+                  value={dueDays}
+                  onChange={(e) => setDueDays(Number(e.target.value))}
+                  className="admin-form-select"
+                >
+                  {Array.from({ length: 60 }, (_, i) => i + 1).map((n) => (
+                    <option key={n} value={n}>
+                      {n}
+                    </option>
+                  ))}
+                </select>
+                {form.due_date && (
+                  <span className="text-tertiary text-xs mt-1">
+                    Splatnost:{" "}
+                    {new Date(form.due_date).toLocaleDateString("cs-CZ")}
+                  </span>
+                )}
+              </FormField>
               <FormField label="DÚZP" error={errors.tax_date} required>
                 <AdminDatePicker
                   mode="date"

src/admin/pages/Invoices.tsx

@@ -194,7 +194,6 @@ export default function Invoices() {
   }>({ show: false, invoice: null });
   const [deleting, setDeleting] = useState(false);
   const [pdfLoading, setPdfLoading] = useState<number | null>(null);
-  const [langModal, setLangModal] = useState<Invoice | null>(null);
   const [draft, setDraft] = useState<DraftData | null>(() => {
     try {
       const raw = localStorage.getItem(DRAFT_KEY);
@@ -284,29 +283,25 @@ export default function Invoices() {
     }
   };
 
-  const handlePdf = async (inv: Invoice, lang = "cs") => {
+  const handlePdf = async (inv: Invoice) => {
     if (pdfLoading) return;
-    setLangModal(null);
+    const newWindow = window.open("", "_blank");
     setPdfLoading(inv.id);
     try {
-      const response = await apiFetch(
-        `${API_BASE}/invoices-pdf/${inv.id}?lang=${encodeURIComponent(lang)}`,
-      );
-      if (response.status === 401) return;
-      if (!response.ok) {
-        alert.error("Nepodařilo se vygenerovat PDF");
+      const response = await apiFetch(`${API_BASE}/invoices/${inv.id}/file`);
+      if (response.status === 401) {
+        newWindow?.close();
         return;
       }
-      const html = await response.text();
-      const w = window.open("", "_blank");
-      if (w) {
-        w.document.open();
-        w.document.write(html);
-        w.document.close();
-        w.onload = () => w.print();
-      } else {
-        alert.error("Prohlížeč zablokoval vyskakovací okno");
+      if (!response.ok) {
+        newWindow?.close();
+        alert.error("PDF soubor nenalezen — otevřete fakturu a uložte ji");
+        return;
       }
+      const blob = await response.blob();
+      const url = URL.createObjectURL(blob);
+      if (newWindow) newWindow.location.href = url;
+      setTimeout(() => URL.revokeObjectURL(url), 60000);
     } catch {
       alert.error("Chyba při generování PDF");
     } finally {
@@ -996,26 +991,44 @@ export default function Invoices() {
                                 <Link
                                   to={`/invoices/${inv.id}`}
                                   className="admin-btn-icon"
-                                  title="Detail"
-                                  aria-label="Detail"
+                                  title={
+                                    inv.status === "paid" ? "Detail" : "Upravit"
+                                  }
+                                  aria-label={
+                                    inv.status === "paid" ? "Detail" : "Upravit"
+                                  }
                                 >
-                                  <svg
-                                    width="18"
-                                    height="18"
-                                    viewBox="0 0 24 24"
-                                    fill="none"
-                                    stroke="currentColor"
-                                    strokeWidth="2"
-                                  >
-                                    <path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z" />
-                                    <circle cx="12" cy="12" r="3" />
-                                  </svg>
+                                  {inv.status === "paid" ? (
+                                    <svg
+                                      width="18"
+                                      height="18"
+                                      viewBox="0 0 24 24"
+                                      fill="none"
+                                      stroke="currentColor"
+                                      strokeWidth="2"
+                                    >
+                                      <path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z" />
+                                      <circle cx="12" cy="12" r="3" />
+                                    </svg>
+                                  ) : (
+                                    <svg
+                                      width="18"
+                                      height="18"
+                                      viewBox="0 0 24 24"
+                                      fill="none"
+                                      stroke="currentColor"
+                                      strokeWidth="2"
+                                    >
+                                      <path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7" />
+                                      <path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z" />
+                                    </svg>
+                                  )}
                                 </Link>
                                 {hasPermission("invoices.export") && (
                                   <button
-                                    onClick={() => setLangModal(inv)}
+                                    onClick={() => handlePdf(inv)}
                                     className="admin-btn-icon"
-                                    title="PDF"
+                                    title="Zobrazit fakturu"
                                     disabled={pdfLoading === inv.id}
                                   >
                                     {pdfLoading === inv.id ? (
@@ -1092,69 +1105,6 @@ export default function Invoices() {
             type="danger"
             loading={deleting}
           />
-
-          <AnimatePresence>
-            {langModal && (
-              <motion.div
-                className="admin-modal-overlay"
-                initial={{ opacity: 0 }}
-                animate={{ opacity: 1 }}
-                exit={{ opacity: 0 }}
-                transition={{ duration: 0.2 }}
-              >
-                <div
-                  className="admin-modal-backdrop"
-                  onClick={() => setLangModal(null)}
-                />
-                <motion.div
-                  className="admin-modal admin-confirm-modal"
-                  role="dialog"
-                  aria-modal="true"
-                  initial={{ opacity: 0, scale: 0.95, y: 20 }}
-                  animate={{ opacity: 1, scale: 1, y: 0 }}
-                  exit={{ opacity: 0, scale: 0.95, y: 20 }}
-                  transition={{ duration: 0.2 }}
-                >
-                  <div className="admin-modal-body admin-confirm-content">
-                    <div className="admin-confirm-icon admin-confirm-icon-info">
-                      <svg
-                        width="24"
-                        height="24"
-                        viewBox="0 0 24 24"
-                        fill="none"
-                        stroke="currentColor"
-                        strokeWidth="2"
-                      >
-                        <path d="M12 22c5.523 0 10-4.477 10-10S17.523 2 12 2 2 6.477 2 12s4.477 10 10 10z" />
-                        <path d="M2 12h20" />
-                        <path d="M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z" />
-                      </svg>
-                    </div>
-                    <h2 className="admin-confirm-title">Jazyk faktury</h2>
-                    <p className="admin-confirm-message">
-                      V jakém jazyce chcete vygenerovat fakturu?
-                    </p>
-                  </div>
-                  <div className="admin-modal-footer">
-                    <button
-                      type="button"
-                      onClick={() => handlePdf(langModal, "cs")}
-                      className="admin-btn admin-btn-primary"
-                    >
-                      Čeština
-                    </button>
-                    <button
-                      type="button"
-                      onClick={() => handlePdf(langModal, "en")}
-                      className="admin-btn admin-btn-primary"
-                    >
-                      English
-                    </button>
-                  </div>
-                </motion.div>
-              </motion.div>
-            )}
-          </AnimatePresence>
         </>
       )}
     </div>

src/services/invoices.service.ts

@@ -70,6 +70,11 @@ export async function markOverdueInvoices() {
       where: { status: "issued", due_date: { lt: new Date() } },
       data: { status: "overdue" },
     });
+    // Reverse: if due_date was changed to future, set back to issued
+    await prisma.invoices.updateMany({
+      where: { status: "overdue", due_date: { gte: new Date() } },
+      data: { status: "issued" },
+    });
   } catch (err) {
     console.error("markOverdueInvoices failed:", err);
   }
@@ -350,8 +355,8 @@ export async function updateInvoice(id: number, body: Record<string, any>) {
 
   const data: Record<string, unknown> = { modified_at: new Date() };
 
-  // Only allow full editing in 'issued' state
-  const isDraft = currentStatus === "issued";
+  // Allow full editing in 'issued' and 'overdue' states
+  const isDraft = currentStatus === "issued" || currentStatus === "overdue";
   if (isDraft) {
     const strFields = [
       "currency",

src/services/nas-financials-manager.ts

@@ -41,7 +41,13 @@ class NasFinancialsManager {
         const yearPath = path.join(issuedDir, yearDir);
         if (!fs.statSync(yearPath).isDirectory()) continue;
         for (const monthDir of fs.readdirSync(yearPath)) {
-          const filePath = path.join(yearPath, monthDir, safeName);
+          const monthPath = path.join(yearPath, monthDir);
+          try {
+            if (!fs.statSync(monthPath).isDirectory()) continue;
+          } catch {
+            continue;
+          }
+          const filePath = path.join(monthPath, safeName);
           if (fs.existsSync(filePath)) {
             fs.unlinkSync(filePath);
           }