Fixes grid calendar item sorting

app/src/main/java/net/pokeranalytics/android/ui/modules/calendar/GridCalendarViewModel.kt

@@ -18,17 +18,12 @@ class GridCalendarViewModel : ViewModel(), RowRepresentableDataSource {
 
 	var selectedTimeUnit: TimeUnit = TimeUnit.DAY
 
-	private var groups: TreeSet<Date> = TreeSet<Date>()
+	private var groupDates: TreeSet<Date> = TreeSet<Date>()
 
 	private var results: HashMap<Date, CalendarItemCell> = HashMap()
 
 	private fun addGroup(date: Date) {
-		this.groups.add(date)
-	}
-
-	private fun result(index: Int): CalendarItemCell {
-		val group = this.groups.elementAt(index)
-		return this.results[group] ?: throw PAIllegalStateException("item not found")
+		this.groupDates.add(date)
 	}
 
 	private fun addResult(group: Date, result: CellResult, unit: TimeUnit) {
@@ -40,12 +35,14 @@ class GridCalendarViewModel : ViewModel(), RowRepresentableDataSource {
 	}
 
 	private fun clear() {
-		this.groups.clear()
+		this.groupDates.clear()
 		this.results.clear()
 	}
 
 	fun buildDataStructure() {
 
+
+
 //		Timber.d(">>> Start buildDataStructure: ${this.selectedTimeUnit}")
 
 		this.clear()
@@ -94,7 +91,7 @@ class GridCalendarViewModel : ViewModel(), RowRepresentableDataSource {
 	// RowRepresentableDataSource
 
 	override fun adapterRows(): List<RowRepresentable> {
-		return this.groups.descendingSet().map { this.results[it]!! }
+		return this.groupDates.map { this.results[it]!! }
 	}
 
 	override fun rowRepresentableForPosition(position: Int): RowRepresentable {
@@ -109,12 +106,16 @@ class GridCalendarViewModel : ViewModel(), RowRepresentableDataSource {
 		return RowViewType.CALENDAR_GRID_CELL.ordinal
 	}
 
+	private fun result(index: Int): CalendarItemCell {
+		val group = this.groupDates.elementAt(this.results.size - index - 1) // sort descendingly
+		return this.results[group] ?: throw PAIllegalStateException("item not found")
+	}
+
 }
 
 class CalendarItemCell(var date: Date, result: CellResult, var unit: TimeUnit) : RowRepresentable, RowRepresentableDataSource {
 
 	private var results: MutableList<CellResult> = mutableListOf(result)
-		private set
 
 	fun add(result: CellResult) {
 		this.results.add(result)