Add pages for sound synthesizers.

Marechai.App/Presentation/ViewModels/SoundSynthsListViewModel.cs

@@ -0,0 +1,103 @@
+#nullable enable
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Threading.Tasks;
+using Marechai.App.Presentation.Models;
+using Marechai.App.Services;
+using Uno.Extensions.Navigation;
+
+namespace Marechai.App.Presentation.ViewModels;
+
+public partial class SoundSynthsListViewModel : ObservableObject
+{
+    private readonly ILogger<SoundSynthsListViewModel> _logger;
+    private readonly INavigator                        _navigator;
+    private readonly SoundSynthsService                _soundSynthsService;
+
+    [ObservableProperty]
+    private string _errorMessage = string.Empty;
+
+    [ObservableProperty]
+    private bool _hasError;
+
+    [ObservableProperty]
+    private bool _isDataLoaded;
+
+    [ObservableProperty]
+    private bool _isLoading = true;
+
+    [ObservableProperty]
+    private ObservableCollection<SoundSynthListItem> _soundSynths = [];
+
+    public SoundSynthsListViewModel(SoundSynthsService                soundSynthsService, INavigator navigator,
+                                    ILogger<SoundSynthsListViewModel> logger)
+    {
+        _soundSynthsService         = soundSynthsService;
+        _navigator                  = navigator;
+        _logger                     = logger;
+        LoadData                    = new AsyncRelayCommand(LoadDataAsync);
+        NavigateToSoundSynthCommand = new AsyncRelayCommand<SoundSynthListItem>(NavigateToSoundSynthAsync);
+    }
+
+    public IAsyncRelayCommand                     LoadData                    { get; }
+    public IAsyncRelayCommand<SoundSynthListItem> NavigateToSoundSynthCommand { get; }
+
+    private async Task LoadDataAsync()
+    {
+        try
+        {
+            IsLoading    = true;
+            IsDataLoaded = false;
+            HasError     = false;
+            ErrorMessage = string.Empty;
+
+            List<SoundSynthDto> soundSynths = await _soundSynthsService.GetAllSoundSynthsAsync();
+
+            SoundSynths = new ObservableCollection<SoundSynthListItem>(soundSynths.Select(ss => new SoundSynthListItem
+                                                                           {
+                                                                               Id      = ss.Id      ?? 0,
+                                                                               Name    = ss.Name    ?? "Unknown",
+                                                                               Company = ss.Company ?? "Unknown"
+                                                                           })
+                                                                          .OrderBy(ss => ss.Company)
+                                                                          .ThenBy(ss => ss.Name));
+
+            _logger.LogInformation("Successfully loaded {Count} Sound Synthesizers", SoundSynths.Count);
+            IsDataLoaded = true;
+        }
+        catch(Exception ex)
+        {
+            _logger.LogError(ex, "Error loading Sound Synthesizers");
+            ErrorMessage = "Failed to load Sound Synthesizers. Please try again later.";
+            HasError     = true;
+        }
+        finally
+        {
+            IsLoading = false;
+        }
+    }
+
+    private async Task NavigateToSoundSynthAsync(SoundSynthListItem? item)
+    {
+        if(item == null) return;
+
+        _logger.LogInformation("Navigating to Sound Synthesizer {SoundSynthId}", item.Id);
+
+        await _navigator.NavigateViewModelAsync<SoundSynthDetailViewModel>(this,
+                                                                           data: new SoundSynthDetailNavigationParameter
+                                                                           {
+                                                                               SoundSynthId     = item.Id,
+                                                                               NavigationSource = this
+                                                                           });
+    }
+
+    public class SoundSynthListItem
+    {
+        public int     Id      { get; set; }
+        public string  Name    { get; set; } = string.Empty;
+        public string? Company { get; set; }
+    }
+}