properly export email event reminders in .ics files

app/src/main/kotlin/com/simplemobiletools/calendar/pro/activities/SettingsActivity.kt

@@ -315,7 +315,6 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
-
     private fun setupWeekNumbers() {
         settings_week_numbers.isChecked = config.showWeekNumbers
         settings_week_numbers_holder.setOnClickListener {

app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/CalDAVHelper.kt

@@ -53,7 +53,7 @@ class CalDAVHelper(val context: Context) {
     }
 
     @SuppressLint("MissingPermission")
-    fun getCalDAVCalendars(ids: String, showToasts: Boolean): List<CalDAVCalendar> {
+    fun getCalDAVCalendars(ids: String, showToasts: Boolean): ArrayList<CalDAVCalendar> {
         val calendars = ArrayList<CalDAVCalendar>()
         if (!context.hasPermission(PERMISSION_WRITE_CALENDAR) || !context.hasPermission(PERMISSION_READ_CALENDAR)) {
             return calendars
@@ -73,7 +73,7 @@ class CalDAVHelper(val context: Context) {
         var cursor: Cursor? = null
         try {
             cursor = context.contentResolver.query(uri, projection, selection, null, null)
-            if (cursor != null && cursor.moveToFirst()) {
+            if (cursor?.moveToFirst() == true) {
                 do {
                     val id = cursor.getIntValue(CalendarContract.Calendars._ID)
                     val displayName = cursor.getStringValue(CalendarContract.Calendars.CALENDAR_DISPLAY_NAME)
@@ -145,7 +145,7 @@ class CalDAVHelper(val context: Context) {
         var cursor: Cursor? = null
         try {
             cursor = context.contentResolver.query(uri, projection, selection, selectionArgs, null)
-            if (cursor != null && cursor.moveToFirst()) {
+            if (cursor?.moveToFirst() == true) {
                 do {
                     val colorKey = cursor.getIntValue(CalendarContract.Colors.COLOR_KEY)
                     val color = cursor.getIntValue(CalendarContract.Colors.COLOR)
@@ -193,7 +193,7 @@ class CalDAVHelper(val context: Context) {
         var cursor: Cursor? = null
         try {
             cursor = context.contentResolver.query(uri, projection, selection, null, null)
-            if (cursor != null && cursor.moveToFirst()) {
+            if (cursor?.moveToFirst() == true) {
                 do {
                     val id = cursor.getLongValue(CalendarContract.Events._ID)
                     val title = cursor.getStringValue(CalendarContract.Events.TITLE) ?: ""
@@ -457,7 +457,7 @@ class CalDAVHelper(val context: Context) {
         var cursor: Cursor? = null
         try {
             cursor = context.contentResolver.query(uri, projection, selection, null, null)
-            if (cursor != null && cursor.moveToFirst()) {
+            if (cursor?.moveToFirst() == true) {
                 do {
                     val minutes = cursor.getIntValue(CalendarContract.Reminders.MINUTES)
                     val method = cursor.getIntValue(CalendarContract.Reminders.METHOD)

app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/Constants.kt

@@ -100,6 +100,8 @@ const val SUMMARY = "SUMMARY"
 const val DESCRIPTION = "DESCRIPTION:"
 const val UID = "UID:"
 const val ACTION = "ACTION:"
+const val ATTENDEE = "ATTENDEE:"
+const val MAILTO = "mailto:"
 const val TRIGGER = "TRIGGER:"
 const val RRULE = "RRULE:"
 const val CATEGORIES = "CATEGORIES:"
@@ -116,6 +118,7 @@ const val SEQUENCE = "SEQUENCE"
 const val CATEGORY_COLOR = "CATEGORY_COLOR:"
 
 const val DISPLAY = "DISPLAY"
+const val EMAIL = "EMAIL"
 const val FREQ = "FREQ"
 const val UNTIL = "UNTIL"
 const val COUNT = "COUNT"

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

@@ -1,8 +1,10 @@
 package com.simplemobiletools.calendar.pro.helpers
 
 import com.simplemobiletools.calendar.pro.R
+import com.simplemobiletools.calendar.pro.extensions.calDAVHelper
 import com.simplemobiletools.calendar.pro.extensions.eventTypesDB
 import com.simplemobiletools.calendar.pro.helpers.IcsExporter.ExportResult.*
+import com.simplemobiletools.calendar.pro.models.CalDAVCalendar
 import com.simplemobiletools.calendar.pro.models.Event
 import com.simplemobiletools.commons.activities.BaseSimpleActivity
 import com.simplemobiletools.commons.extensions.getFileOutputStream
@@ -19,6 +21,7 @@ class IcsExporter {
 
     private var eventsExported = 0
     private var eventsFailed = 0
+    private var calendars = ArrayList<CalDAVCalendar>()
 
     fun exportEvents(activity: BaseSimpleActivity, file: File, events: ArrayList<Event>, showExportingToast: Boolean, callback: (result: ExportResult) -> Unit) {
         val fileDirItem = FileDirItem(file.absolutePath, file.name)
@@ -29,6 +32,7 @@ class IcsExporter {
             }
 
             Thread {
+                calendars = activity.calDAVHelper.getCalDAVCalendars("", false)
                 if (showExportingToast) {
                     activity.toast(R.string.exporting)
                 }
@@ -77,17 +81,20 @@ class IcsExporter {
     }
 
     private fun fillReminders(event: Event, out: BufferedWriter) {
-        checkReminder(event.reminder1Minutes, out)
+        event.getReminders().forEach {
-        checkReminder(event.reminder2Minutes, out)
+            val reminder = it
-        checkReminder(event.reminder3Minutes, out)
-    }
-
-    private fun checkReminder(minutes: Int, out: BufferedWriter) {
-        if (minutes != -1) {
             out.apply {
                 writeLn(BEGIN_ALARM)
-                writeLn("$ACTION$DISPLAY")
+                if (reminder.type == REMINDER_NOTIFICATION) {
-                writeLn("$TRIGGER-${Parser().getDurationCode(minutes.toLong())}")
+                    writeLn("$ACTION$DISPLAY")
+                } else {
+                    writeLn("$ACTION$EMAIL")
+                    val attendee = calendars.firstOrNull { it.id == event.getCalDAVCalendarId()}?.accountName
+                    if (attendee != null) {
+                        writeLn("$ATTENDEE$MAILTO$attendee")
+                    }
+                }
+                writeLn("$TRIGGER-${Parser().getDurationCode(reminder.minutes.toLong())}")
                 writeLn(END_ALARM)
             }
         }