implement button to create event in nextcloud

assets/launch.js

@@ -357,9 +357,12 @@ const meetingStartInput = document.getElementById("meetingStart");
 const meetingEndInput = document.getElementById("meetingEnd");
 const meetingOrganizerInput = document.getElementById("meetingOrganizer");
 const createMeetingButton = document.getElementById("createMeetingButton");
+const createNextcloudButton = document.getElementById('createNextcloudButton');
 const createAdhocButton = document.getElementById("createAdhocButton");
 const cancelCreateButton = document.getElementById("cancelCreateButton");
 const icsSuccess = document.getElementById("icsSuccess");
+const nextcloudStatus = document.getElementById('nextcloudStatus');
+const nextcloudError = document.getElementById('nextcloudError');
 const downloadIcsLink = document.getElementById("downloadIcsLink");
 const adhocResult = document.getElementById("adhocResult");
 const adhocLink = document.getElementById("adhocLink");
@@ -1000,6 +1003,85 @@ function showMeetingCreator() {
   meetingEndInput.value = formatLocal(end);
 }
 
+function openNextcloudCalendarCreator() {
+    const meetingName =
+        meetingNameInput.value.trim();
+
+    const description =
+        meetingDescriptionInput.value.trim();
+
+    const startTime =
+        meetingStartInput.value;
+
+    const endTime =
+        meetingEndInput.value;
+
+    const organizer =
+        meetingOrganizerInput.value.trim();
+
+    if (!meetingName) {
+        alert('Please enter a meeting name.');
+        meetingNameInput.focus();
+        return;
+    }
+
+    if (!startTime || !endTime) {
+        alert('Please enter start and end time.');
+        return;
+    }
+
+    const start = new Date(startTime);
+    const end = new Date(endTime);
+
+    if (Number.isNaN(start.getTime()) ||
+        Number.isNaN(end.getTime())) {
+        alert('Invalid start or end date.');
+        return;
+    }
+
+    if (end <= start) {
+        alert('End time must be after start time.');
+        return;
+    }
+
+    /*
+     * Use exactly the same room-generation logic as the
+     * existing ICS creation.
+     */
+    const roomName = createRoomName(meetingName);
+
+    const meetingUrl =
+        createLaunchUrl(roomName);
+
+    const nextcloudBase =
+        'https://cloud.bnvb-ingenieure.de';
+
+    const params = new URLSearchParams();
+
+    params.set('summary', meetingName);
+
+    if (description) {
+        params.set('description', description);
+    }
+
+    params.set('start', startTime);
+    params.set('end', endTime);
+
+    if (organizer) {
+        params.set('organizer', organizer);
+    }
+
+    params.set('location', meetingUrl);
+    params.set('url', meetingUrl);
+
+    const nextcloudUrl =
+        nextcloudBase +
+        '/index.php/apps/jitsi_calendar/confirm?' +
+        params.toString();
+
+    window.location.href = nextcloudUrl;
+}
+
 function createMeeting() {
   const meetingName = meetingNameInput.value.trim();
   const description = meetingDescriptionInput.value.trim();
@@ -1262,6 +1344,13 @@ createMeetingButton.addEventListener(
   createMeeting
 );
 
+if (createNextcloudButton) {
+  createNextcloudButton.addEventListener(
+    'click',
+    openNextcloudCalendarCreator
+  );
+}
+
 createAdhocButton.addEventListener(
   "click",
   createAdhocLink