Refactor: Verbessere CalDAV und Bookings für Multi-Treatment-Support

- CalDAV SUMMARY zeigt jetzt alle Treatment-Namen als Liste statt Anzahl
- Treatments-Array im Booking-Type optional für Rückwärtskompatibilität
- Neue addMinutesToTime Helper-Funktion für saubere DTEND-Berechnung
- getTreatmentNames filtert leere Namen und liefert sicheren Fallback

src/server/routes/caldav.ts

@@ -5,7 +5,7 @@ import { assertOwner } from "../lib/auth.js";
 // Types für Buchungen (vereinfacht für CalDAV)
 type Booking = {
   id: string;
-  treatmentId: string;
+  treatments?: Array<{id: string, name: string, duration: number, price: number}>;
   customerName: string;
   customerEmail?: string;
   customerPhone?: string;
@@ -13,6 +13,8 @@ type Booking = {
   appointmentTime: string; // HH:MM
   status: "pending" | "confirmed" | "cancelled" | "completed";
   notes?: string;
+  // Deprecated fields for backward compatibility
+  treatmentId?: string;
   bookedDurationMinutes?: number;
   createdAt: string;
 };
@@ -44,6 +46,14 @@ function formatDateTime(dateStr: string, timeStr: string): string {
   return date.toISOString().replace(/[-:]/g, '').replace(/\.\d{3}/, '');
 }
 
+function addMinutesToTime(timeStr: string, minutesToAdd: number): string {
+  const [hours, minutes] = timeStr.split(':').map(Number);
+  const totalMinutes = hours * 60 + minutes + minutesToAdd;
+  const newHours = Math.floor(totalMinutes / 60);
+  const newMinutes = totalMinutes % 60;
+  return `${String(newHours).padStart(2, '0')}:${String(newMinutes).padStart(2, '0')}`;
+}
+
 function generateICSContent(bookings: Booking[], treatments: Treatment[]): string {
   const now = new Date().toISOString().replace(/[-:]/g, '').replace(/\.\d{3}/, '');
   
@@ -63,14 +73,41 @@ X-WR-TIMEZONE:Europe/Berlin
   );
 
   for (const booking of activeBookings) {
-    const treatment = treatments.find(t => t.id === booking.treatmentId);
-    const treatmentName = treatment?.name || 'Unbekannte Behandlung';
-    const duration = booking.bookedDurationMinutes || treatment?.duration || 60;
+    // Handle new treatments array structure
+    let treatmentNames: string;
+    let duration: number;
+    let treatmentDetails: string;
+    let totalPrice = 0;
+
+    if (booking.treatments && Array.isArray(booking.treatments) && booking.treatments.length > 0) {
+      // Use new treatments array
+      treatmentNames = booking.treatments.map(t => t.name).join(', ');
+      
+      duration = booking.treatments.reduce((sum, t) => sum + (t.duration || 0), 0);
+      totalPrice = booking.treatments.reduce((sum, t) => sum + (t.price || 0), 0);
+      
+      // Build detailed treatment list for description
+      treatmentDetails = booking.treatments
+        .map(t => `- ${t.name} (${t.duration} Min., ${t.price}€)`)
+        .join('\\n');
+      
+      if (booking.treatments.length > 1) {
+        treatmentDetails += `\\n\\nGesamt: ${duration} Min., ${totalPrice.toFixed(2)}€`;
+      }
+    } else {
+      // Fallback to deprecated treatmentId for backward compatibility
+      const treatment = booking.treatmentId ? treatments.find(t => t.id === booking.treatmentId) : null;
+      treatmentNames = treatment?.name || 'Unbekannte Behandlung';
+      duration = booking.bookedDurationMinutes || treatment?.duration || 60;
+      treatmentDetails = `Behandlung: ${treatmentNames}`;
+      if (treatment?.price) {
+        treatmentDetails += ` (${duration} Min., ${treatment.price}€)`;
+      }
+    }
     
     const startTime = formatDateTime(booking.appointmentDate, booking.appointmentTime);
-    const endTime = formatDateTime(booking.appointmentDate, 
-      `${String(Math.floor((parseInt(booking.appointmentTime.split(':')[0]) * 60 + parseInt(booking.appointmentTime.split(':')[1]) + duration) / 60)).padStart(2, '0')}:${String((parseInt(booking.appointmentTime.split(':')[0]) * 60 + parseInt(booking.appointmentTime.split(':')[1]) + duration) % 60).padStart(2, '0')}`
-    );
+    const endTimeStr = addMinutesToTime(booking.appointmentTime, duration);
+    const endTime = formatDateTime(booking.appointmentDate, endTimeStr);
 
     // UID für jeden Termin (eindeutig)
     const uid = `booking-${booking.id}@stargirlnails.de`;
@@ -83,8 +120,8 @@ UID:${uid}
 DTSTAMP:${now}
 DTSTART:${startTime}
 DTEND:${endTime}
-SUMMARY:${treatmentName} - ${booking.customerName}
-DESCRIPTION:Behandlung: ${treatmentName}\\nKunde: ${booking.customerName}${booking.customerPhone ? `\\nTelefon: ${booking.customerPhone}` : ''}${booking.notes ? `\\nNotizen: ${booking.notes}` : ''}
+SUMMARY:${treatmentNames} - ${booking.customerName}
+DESCRIPTION:${treatmentDetails}\\n\\nKunde: ${booking.customerName}${booking.customerPhone ? `\\nTelefon: ${booking.customerPhone}` : ''}${booking.notes ? `\\nNotizen: ${booking.notes}` : ''}
 STATUS:${status}
 TRANSP:OPAQUE
 END:VEVENT