add a helper function for adding new events in caldav

app/src/main/kotlin/com/simplemobiletools/calendar/extensions/Context.kt

@@ -8,6 +8,7 @@ import android.app.NotificationManager
 import android.app.PendingIntent
 import android.appwidget.AppWidgetManager
 import android.content.ComponentName
+import android.content.ContentValues
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
@@ -336,6 +337,28 @@ fun Context.fetchCalDAVCalendarEvents(calendarId: Long, eventTypeId: Int) {
     }
 }
 
+fun Context.addCalDAVEvent(event: Event, calendarId: Int) {
+    val durationMinutes = (event.endTS - event.startTS) / 1000 / 60
+    val uri = CalendarContract.Events.CONTENT_URI
+    val values = ContentValues().apply {
+        put(CalendarContract.Events.CALENDAR_ID, calendarId)
+        put(CalendarContract.Events.TITLE, event.title)
+        put(CalendarContract.Events.DESCRIPTION, event.description)
+        put(CalendarContract.Events.DTSTART, event.startTS * 1000L)
+        put(CalendarContract.Events.ALL_DAY, if (event.getIsAllDay()) 1 else 0)
+        put(CalendarContract.Events.RRULE, Parser().getShortRepeatInterval(event))
+        put(CalendarContract.Events.EVENT_TIMEZONE, TimeZone.getDefault().toString())
+
+        if (event.repeatInterval > 0) {
+            put(CalendarContract.Events.DURATION, Parser().getDurationString(durationMinutes))
+        } else {
+            put(CalendarContract.Events.DTEND, event.endTS * 1000L)
+        }
+    }
+
+    contentResolver.insert(uri, values)
+}
+
 fun Context.getCalDAVEventReminders(eventId: Long): List<Int> {
     val reminders = ArrayList<Int>()
     val uri = CalendarContract.Reminders.CONTENT_URI

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/IcsExporter.kt

@@ -69,26 +69,11 @@ class IcsExporter {
         if (minutes != -1) {
             out.writeLn(BEGIN_ALARM)
             out.writeLn("$ACTION$DISPLAY")
-            out.writeLn("$TRIGGER${getReminderString(minutes)}")
+            out.writeLn("$TRIGGER${Parser().getDurationString(minutes)}")
             out.writeLn(END_ALARM)
         }
     }
 
-    private fun getReminderString(minutes: Int): String {
-        var days = 0
-        var hours = 0
-        var remainder = minutes
-        if (remainder >= DAY_MINUTES) {
-            days = Math.floor(((remainder / DAY_MINUTES).toDouble())).toInt()
-            remainder -= days * DAY_MINUTES
-        }
-        if (remainder >= 60) {
-            hours = Math.floor(((remainder / 60).toDouble())).toInt()
-            remainder -= hours * 60
-        }
-        return "-P${days}DT${hours}H${remainder}M0S"
-    }
-
     private fun fillIgnoredOccurrences(event: Event, out: BufferedWriter) {
         event.ignoreEventOccurrences.forEach {
             out.writeLn("$EXDATE:$it}")

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Parser.kt

@@ -208,4 +208,20 @@ class Parser {
     }
 
     private fun getDurationValue(duration: String, char: String) = Regex("[0-9]+(?=$char)").find(duration)?.value?.toInt() ?: 0
+
+    // from 65 to P0DT1H5M0S
+    fun getDurationString(minutes: Int): String {
+        var days = 0
+        var hours = 0
+        var remainder = minutes
+        if (remainder >= DAY_MINUTES) {
+            days = Math.floor((remainder / DAY_MINUTES).toDouble()).toInt()
+            remainder -= days * DAY_MINUTES
+        }
+        if (remainder >= 60) {
+            hours = Math.floor((remainder / 60).toDouble()).toInt()
+            remainder -= hours * 60
+        }
+        return "-P${days}DT${hours}H${remainder}M0S"
+    }
 }