Added SessionGroup creation + refactoring

app/src/main/java/net/pokeranalytics/android/model/realm/TimeFrame.kt

@@ -34,16 +34,18 @@ open class TimeFrame : RealmObject() {
     // indicates a state of pause
     var paused: Boolean = false
 
+    // Session
     @LinkingObjects("timeFrame")
-    private val sessions: RealmResults<Session>? = null
+    private val sessions: RealmResults<Session>? = null // we should have only one session
-
-    @LinkingObjects("timeFrame")
-    private val groups: RealmResults<SessionGroup>? = null
 
     @Ignore
     var session: Session? = null
         get() = this.sessions?.first()
 
+    // Group
+    @LinkingObjects("timeFrame")
+    private val groups: RealmResults<SessionGroup>? = null // we should have only one group
+
     @Ignore
     var group: SessionGroup? = null
         get() = this.groups?.first()
@@ -60,13 +62,7 @@ open class TimeFrame : RealmObject() {
     }
 
     private fun computeDuration() {
-
+        var endDate: Date = this.endDate ?: Date()
-        var endDate: Date
-        if (this.endDate != null) {
-            endDate = this.endDate!!
-        } else {
-            endDate = Date()
-        }
         this.duration = endDate.time - startDate.time - this.breakDuration
     }
 
@@ -102,11 +98,32 @@ open class TimeFrame : RealmObject() {
      */
     private fun updateTimeFrames(sessionGroups: RealmResults<SessionGroup>) {
 
-        // update
+        when (sessionGroups.size) {
-        if (sessionGroups.size == 1) {
+            0 -> this.createSessionGroup()
+            1 -> this.updateSingleSessionGroup(sessionGroups.first()?.timeFrame!!)
+            else -> this.mergeSessionGroups(sessionGroups)
+        }
+
+    }
+
+    private fun createSessionGroup() {
+
+        val group: SessionGroup = SessionGroup.newInstance()
+        group.timeFrame?.let {
+            it.startDate = this.startDate
+            it.endDate = this.endDate
+        } ?: run {
+            throw ModelException("TimeFrame should never be null here")
+        }
+
+    }
+
+    /**
+     * Single session group update
+     * Changes the group timeframe using the current timeframe dates
+     */
+    private fun updateSingleSessionGroup(groupTimeFrame: TimeFrame) {
 
-            // we are sure that the timeframe is not null from the realm query
-            val groupTimeFrame: TimeFrame = sessionGroups.first()?.timeFrame!!
         if (this.startDate.before(groupTimeFrame.startDate)) {
             groupTimeFrame.startDate = this.startDate
         }
@@ -123,7 +140,13 @@ open class TimeFrame : RealmObject() {
         realm.copyToRealmOrUpdate(groupTimeFrame)
         realm.commitTransaction()
 
-        } else if (sessionGroups.size > 1) {
+    }
+
+    /**
+     * Multiple session groups update:
+     * Merges all groups into one (delete all then create a new one)
+     */
+    private fun mergeSessionGroups(sessionGroups: RealmResults<SessionGroup>) {
 
         var startDate: Date = this.startDate
         var endDate: Date? = this.endDate
@@ -176,9 +199,6 @@ open class TimeFrame : RealmObject() {
         group.sessions.addAll(sessions)
 
         realm.commitTransaction()
-
-        }
-
     }
 
 }