Create database works with new Vm

Refactoring

WinAppCommon/ViewModels/SaveVm.cs

@@ -0,0 +1,55 @@
+using System.Threading.Tasks;
+using Windows.Storage;
+using Windows.Storage.AccessCache;
+using GalaSoft.MvvmLight.Views;
+using MediatR;
+using Microsoft.Extensions.DependencyInjection;
+using ModernKeePass.Application.Database.Commands.CloseDatabase;
+using ModernKeePass.Application.Database.Commands.SaveDatabase;
+using ModernKeePass.Application.Database.Queries.GetDatabase;
+using ModernKeePass.Common;
+using RelayCommand = GalaSoft.MvvmLight.Command.RelayCommand;
+
+namespace ModernKeePass.ViewModels
+{
+    public class SaveVm
+    {
+        public bool IsSaveEnabled => _mediator.Send(new GetDatabaseQuery()).GetAwaiter().GetResult().IsDirty;
+
+        public RelayCommand SaveCommand { get; }
+        public RelayCommand CloseCommand { get; }
+
+        private readonly IMediator _mediator;
+        private readonly INavigationService _navigation;
+
+        public SaveVm() : this(App.Services.GetRequiredService<IMediator>(), App.Services.GetRequiredService<INavigationService>()) { }
+
+        public SaveVm(IMediator mediator, INavigationService navigation)
+        {
+            _mediator = mediator;
+            _navigation = navigation;
+            SaveCommand = new RelayCommand(async () => await Save(), () => IsSaveEnabled);
+            CloseCommand = new RelayCommand(async () => await Close());
+        }
+
+        public async Task Save(bool close = true)
+        {
+            await _mediator.Send(new SaveDatabaseCommand());
+            if (close) await _mediator.Send(new CloseDatabaseCommand());
+            _navigation.NavigateTo(Constants.Navigation.MainPage);
+        }
+
+        public async Task Save(StorageFile file)
+        {
+            var token = StorageApplicationPermissions.FutureAccessList.Add(file);
+            await _mediator.Send(new SaveDatabaseCommand { FilePath = token });
+            _navigation.NavigateTo(Constants.Navigation.MainPage);
+        }
+
+        public async Task Close()
+        {
+            await _mediator.Send(new CloseDatabaseCommand());
+            _navigation.NavigateTo(Constants.Navigation.MainPage);
+        }
+    }
+}