[#31]added two function to setup data to be sent and put function

src/features/Events/eventUtils.ts

@@ -1,6 +1,8 @@
+import { Calendars } from "../Calendars/CalendarTypes";
 import { userAttendee } from "../User/userDataTypes";
 import { CalendarEvent } from "./EventsTypes";
-
+import ICAL from "ical.js";
+import { TIMEZONES } from "../../utils/timezone-data";
 type RawEntry = [string, Record<string, string>, string, any];
 
 export function parseCalendarEvent(
@@ -83,3 +85,137 @@ export function parseCalendarEvent(
 
   return event as CalendarEvent;
 }
+
+export function calendarEventToJCal(event: CalendarEvent): any[] {
+  const tzid = event.timezone ?? "UTC"; // Fallback to UTC if no timezone provided
+
+  const vevent: any[] = [
+    "vevent",
+    [
+      ["uid", {}, "text", event.uid],
+      ["transp", {}, "text", event.transp ?? "OPAQUE"],
+      [
+        "dtstart",
+        { tzid },
+        "date-time",
+        event.start.toISOString().split(".")[0],
+      ],
+      ["class", {}, "text", event.class ?? "PUBLIC"],
+      [
+        "x-openpaas-videoconference",
+        {},
+        "unknown",
+        event.x_openpass_videoconference ?? null,
+      ],
+      ["summary", {}, "text", event.title ?? ""],
+    ],
+    [],
+  ];
+
+  if (event.end) {
+    vevent[1].push([
+      "dtend",
+      { tzid },
+      "date-time",
+      event.start.toISOString().split(".")[0],
+    ]);
+  }
+  if (event.organizer) {
+    vevent[1].push([
+      "organizer",
+      { cn: event.organizer.cn },
+      "cal-address",
+      `mailto:${event.organizer.cal_address}`,
+    ]);
+  }
+
+  event.attendee.forEach((att) => {
+    vevent[1].push([
+      "attendee",
+      {
+        cn: att.cn,
+        partstat: att.partstat,
+        rsvp: att.rsvp,
+        role: att.role,
+        cutype: att.cutype,
+      },
+      "cal-address",
+      `mailto:${att.cal_address}`,
+    ]);
+  });
+
+  const vtimezone: any[] = ["vtimezone", [["tzid", {}, "text", tzid]], []];
+
+  return ["vcalendar", [], [vevent, vtimezone]];
+}
+
+function formatDateToICal(date: Date, tz?: string) {
+  // Format date like: 20250214T110000 (local time)
+  // If tz is provided, use TZID param in DTSTART/DTEND
+  const pad = (n: number) => n.toString().padStart(2, "0");
+  const year = date.getFullYear();
+  const month = pad(date.getMonth() + 1);
+  const day = pad(date.getDate());
+  const hours = pad(date.getHours());
+  const minutes = pad(date.getMinutes());
+  const seconds = pad(date.getSeconds());
+  return `${year}${month}${day}T${hours}${minutes}${seconds}`;
+}
+
+export function calendarEventToICal(
+  cal: Calendars,
+  event: CalendarEvent
+): string {
+  const lines = [];
+  lines.push("BEGIN:VCALENDAR");
+  lines.push("VERSION:2.0");
+  lines.push("PRODID:-//Sabre//Sabre VObject 4.1.3//EN");
+  if (cal.calscale) lines.push(`CALSCALE:${cal.calscale}`);
+  if (cal.version) lines.push(`VERSION:${cal.version}`);
+
+  lines.push(TIMEZONES.zones[event.timezone].ics);
+  lines.push("BEGIN:VEVENT");
+  lines.push(`UID:${event.uid}`);
+
+  if (event.transp) lines.push(`TRANSP:${event.transp.toUpperCase()}`);
+  if (event.start)
+    lines.push(
+      `DTSTART${event.timezone ? `;TZID=${event.timezone}` : ""}:` +
+        formatDateToICal(event.start)
+    );
+  if (event.end)
+    lines.push(
+      `DTEND${event.timezone ? `;TZID=${event.timezone}` : ""}:` +
+        formatDateToICal(event.end)
+    );
+  lines.push(`DTSTAMP:${ICAL.Time.now().toICALString()}`);
+
+  if (event.class) lines.push(`CLASS:${event.class.toUpperCase()}`);
+  if (event.x_openpass_videoconference !== undefined)
+    lines.push(
+      `X-OPENPAAS-VIDEOCONFERENCE:${event.x_openpass_videoconference || ""}`
+    );
+  if (event.title) lines.push(`SUMMARY:${event.title}`);
+  if (event.description) lines.push(`DESCRIPTION:${event.description}`);
+  if (event.location) lines.push(`LOCATION:${event.location}`);
+
+  if (event.organizer) {
+    lines.push(
+      `ORGANIZER;CN=${event.organizer.cn}:${event.organizer.cal_address}`
+    );
+  }
+
+  event.attendee.forEach((att) => {
+    lines.push(
+      `ATTENDEE;PARTSTAT=${att.partstat};RSVP=${att.rsvp};ROLE=${att.role};CUTYPE=${att.cutype};CN=${att.cn}:${att.cal_address}`
+    );
+  });
+
+  if (event.stamp) lines.push(`DTSTAMP:${formatDateToICal(event.stamp)}Z`);
+  if (event.sequence !== undefined) lines.push(`SEQUENCE:${event.sequence}`);
+
+  lines.push("END:VEVENT");
+  lines.push("END:VCALENDAR\n");
+  console.debug(lines.join("\r\n"));
+  return lines.join("\r\n");
+}