Add import IDs to existing tasks on start

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

@@ -1115,7 +1115,7 @@ class EventActivity : SimpleActivity() {
         val newImportId = if (mEvent.id != null) {
             mEvent.importId
         } else {
-            UUID.randomUUID().toString().replace("-", "") + System.currentTimeMillis().toString()
+            generateImportId()
         }
 
         val newEventType = if (!config.caldavSync || config.lastUsedCaldavCalendarId == 0 || mEventCalendarId == STORED_LOCALLY_ONLY) {

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

@@ -159,6 +159,10 @@ class MainActivity : SimpleActivity(), RefreshRecyclerViewListener {
             ConfirmationDialog(this, "", R.string.upgraded_to_pro_calendar, R.string.ok, 0, false) {}
             config.wasUpgradedFromFreeShown = true
         }
+
+        addImportIdsToTasks {
+            refreshViewPager()
+        }
     }
 
     override fun onResume() {

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

@@ -354,7 +354,7 @@ class TaskActivity : SimpleActivity() {
         val newImportId = if (mTask.id != null) {
             mTask.importId
         } else {
-            UUID.randomUUID().toString().replace("-", "") + System.currentTimeMillis().toString()
+            generateImportId()
         }
 
         val reminders = getReminders()

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

@@ -708,3 +708,24 @@ inline fun Context.queryCursorInlined(
         }
     }
 }
+
+fun Context.addImportIdsToTasks(callback: () -> Unit) {
+    ensureBackgroundThread {
+        var count = 0
+
+        eventsDB.getAllTasks()
+            .forEach { task ->
+                if (task.importId.isEmpty()) {
+                    eventsDB.updateTaskImportId(
+                        importId = generateImportId(),
+                        id = task.id!!
+                    )
+                    count += 1
+                }
+            }
+
+        if (count > 0) {
+            callback()
+        }
+    }
+}

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

@@ -3,6 +3,7 @@ package com.simplemobiletools.calendar.pro.helpers
 import com.simplemobiletools.calendar.pro.activities.EventActivity
 import com.simplemobiletools.calendar.pro.activities.TaskActivity
 import com.simplemobiletools.commons.helpers.MONTH_SECONDS
+import java.util.*
 
 const val STORED_LOCALLY_ONLY = 0
 const val ROW_COUNT = 6
@@ -258,3 +259,7 @@ fun getActivityToOpen(isTask: Boolean) = if (isTask) {
 } else {
     EventActivity::class.java
 }
+
+fun generateImportId(): String {
+    return UUID.randomUUID().toString().replace("-", "") + System.currentTimeMillis().toString()
+}

app/src/main/kotlin/com/simplemobiletools/calendar/pro/interfaces/EventsDao.kt

@@ -12,6 +12,9 @@ interface EventsDao {
     @Query("SELECT * FROM events")
     fun getAllEvents(): List<Event>
 
+    @Query("SELECT * FROM events WHERE type = $TYPE_TASK")
+    fun getAllTasks(): List<Event>
+
     @Query("SELECT * FROM events WHERE event_type IN (:eventTypeIds) AND type = $TYPE_EVENT")
     fun getAllEventsWithTypes(eventTypeIds: List<Long>): List<Event>
 
@@ -122,6 +125,9 @@ interface EventsDao {
     @Query("UPDATE events SET flags = :newFlags WHERE id = :id")
     fun updateTaskCompletion(id: Long, newFlags: Int)
 
+    @Query("UPDATE events SET import_id = :importId WHERE id = :id AND type = $TYPE_TASK")
+    fun updateTaskImportId(importId: String, id: Long)
+
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insertOrUpdate(event: Event): Long