Jugenddienst-Stunden/Jugenddienst Stunden/ViewModels/NotesViewModel.cs

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<NoteViewModel> AllNotes { get; }
	public ICommand NewCommand { get; }
	public ICommand SelectNoteCommand { get; }

	public NotesViewModel() {
		AllNotes = new ObservableCollection<NoteViewModel>(Models.Note.LoadAll().Select(n => new NoteViewModel(n)));
		NewCommand = new AsyncRelayCommand(NewNoteAsync);
		SelectNoteCommand = new AsyncRelayCommand<NoteViewModel?>(SelectNoteAsync);
	}

	private async Task NewNoteAsync() {
		await Shell.Current.GoToAsync(nameof(Views.NotePage));
	}

	private async Task SelectNoteAsync(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();
			if (noteId != null) {
				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();
			if (noteId != null) {
				NoteViewModel? matchedNote = AllNotes.FirstOrDefault((n) => n.Identifier == noteId);

				// 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)));
				}
			}
		}
	}
}