⚡ Adding preview content, improvements to RaPla stuff

- Now updating locally stored events instead of deleting them and creating completely new events
- Added text color in the list view to distinguish exams from lectures

DHBW-Service/Views/Tabs/LecturePlanList.swift

@@ -10,13 +10,28 @@ import CoreData
 
 struct LecturePlanList: View {
     @State private var events: [NSManagedObject] = []
+    @State private var sortingAscending = true
     
     var body: some View {
-        List {
-            ForEach(events, id: \.self) { event in
-                HStack {
-                    Text(formatDate(date: event.value(forKeyPath: "startDate") as! Date))
-                    Text(event.value(forKeyPath: "summary") as! String)
+        VStack {
+            Button(action: {
+                // This is obviously bullshit, but it could be used to sort afer summary or smth like that
+                
+                self.sortingAscending = !self.sortingAscending
+                let sectionSortDescriptor = NSSortDescriptor(key: "startDate", ascending: sortingAscending)
+                let sortDescriptors = [sectionSortDescriptor]
+                self.events = UtilityFunctions.getCoreDataObject(entity: "RaPlaEvent", sortDescriptors: sortDescriptors)
+            }){
+                Text("Switch order")
+            }
+            List {
+                ForEach(events, id: \.self) { event in
+                    HStack {
+                        Text(formatDate(date: event.value(forKeyPath: "startDate") as! Date))
+                            .foregroundColor(getEventForegroundColor(for: event))
+                        Text(event.value(forKeyPath: "summary") as! String)
+                            .foregroundColor(getEventForegroundColor(for: event))
+                    }
                 }
             }
         }.onAppear{
@@ -30,6 +45,15 @@ struct LecturePlanList: View {
 struct LecturePlanList_Previews: PreviewProvider {
     static var previews: some View {
         LecturePlanList()
+            .preferredColorScheme(.dark)
+            .environmentObject(getFirstOpening())
+            .environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
+    }
+    
+    static func getFirstOpening() -> LocalSettings {
+        let settings = LocalSettings();
+        settings.isFirstOpening = false;
+        return settings
     }
 }
 
@@ -39,4 +63,15 @@ extension LecturePlanList {
         formatter.dateStyle = .short
         return formatter.string(from: date)
     }
+    
+    private func getEventForegroundColor(for event: NSManagedObject) -> Color {
+        var textColor: Color = .primary
+        if(event.value(forKeyPath: "category") as! String == "Prüfung") {
+            textColor = Color.red
+        } else {
+            textColor = Color.primary
+        }
+        
+        return textColor
+    }
 }