implement CalDAV event deleting

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

@@ -1,5 +1,6 @@
 package com.simplemobiletools.calendar.helpers
 
+import android.content.ContentUris
 import android.content.ContentValues
 import android.content.Context
 import android.database.Cursor
@@ -156,6 +157,12 @@ class CalDAVEventsHandler(val context: Context) {
         }
     }
 
+    fun deleteCalDAVEvent(event: Event) {
+        val uri = CalendarContract.Events.CONTENT_URI
+        val contentUri = ContentUris.withAppendedId(uri, event.getCalDAVId())
+        context.contentResolver.delete(contentUri, null, null)
+    }
+
     fun getCalDAVEventReminders(eventId: Long): List<Int> {
         val reminders = ArrayList<Int>()
         val uri = CalendarContract.Reminders.CONTENT_URI

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

@@ -334,6 +334,8 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
     fun deleteEvents(ids: Array<String>) {
         val args = TextUtils.join(", ", ids)
         val selection = "$MAIN_TABLE_NAME.$COL_ID IN ($args)"
+        val cursor = getEventsCursor(selection)
+        val events = fillEvents(cursor).filter { it.importId.isNotEmpty() }
 
         mDb.delete(MAIN_TABLE_NAME, selection, null)
 
@@ -350,6 +352,10 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
             context.cancelNotification(it.toInt())
         }
 
+        events.forEach {
+            CalDAVEventsHandler(context).deleteCalDAVEvent(it)
+        }
+
         deleteChildEvents(args)
     }
 

app/src/main/kotlin/com/simplemobiletools/calendar/models/Event.kt

@@ -104,4 +104,6 @@ data class Event(var id: Int = 0, var startTS: Int = 0, var endTS: Int = 0, var
             startTS
         }
     }
+
+    fun getCalDAVId() = (importId.split("-").lastOrNull() ?: "0").toString().toLong()
 }