Initial commit

Jugenddienst Stunden/ViewModels/NotesViewModel.cs

@@ -0,0 +1,51 @@
+using CommunityToolkit.Mvvm.Input;
+using Jugenddienst_Stunden.Models;
+using System.Collections.ObjectModel;
+using System.Windows.Input;
+
+namespace Jugenddienst_Stunden.ViewModels;
+
+internal class NotesViewModel : IQueryAttributable {
+	public ObservableCollection<ViewModels.NoteViewModel> AllNotes { get; }
+	public ICommand NewCommand { get; }
+	public ICommand SelectNoteCommand { get; }
+
+	public NotesViewModel() {
+		AllNotes = new ObservableCollection<ViewModels.NoteViewModel>(Models.Note.LoadAll().Select(n => new NoteViewModel(n)));
+		NewCommand = new AsyncRelayCommand(NewNoteAsync);
+		SelectNoteCommand = new AsyncRelayCommand<ViewModels.NoteViewModel>(SelectNoteAsync);
+	}
+
+	private async Task NewNoteAsync() {
+		await Shell.Current.GoToAsync(nameof(Views.NotePage));
+	}
+
+	private async Task SelectNoteAsync(ViewModels.NoteViewModel note) {
+		if (note != null)
+			await Shell.Current.GoToAsync($"{nameof(Views.NotePage)}?load={note.Identifier}");
+	}
+
+	void IQueryAttributable.ApplyQueryAttributes(IDictionary<string, object> query) {
+		if (query.ContainsKey("deleted")) {
+			string noteId = query["deleted"].ToString();
+			NoteViewModel matchedNote = AllNotes.Where((n) => n.Identifier == noteId).FirstOrDefault();
+
+			// If note exists, delete it
+			if (matchedNote != null)
+				AllNotes.Remove(matchedNote);
+		} else if (query.ContainsKey("saved")) {
+			string noteId = query["saved"].ToString();
+			NoteViewModel matchedNote = AllNotes.Where((n) => n.Identifier == noteId).FirstOrDefault();
+
+			// If note is found, update it
+			if (matchedNote != null) {
+				matchedNote.Reload();
+				AllNotes.Move(AllNotes.IndexOf(matchedNote), 0);
+			}
+
+			// If note isn't found, it's new; add it.
+			else
+				AllNotes.Insert(0, new NoteViewModel(Note.Load(noteId)));
+		}
+	}
+}