import users, delete users

Presence.Desktop/App.axaml

@@ -1,14 +1,8 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              x:Class="Presence.Desktop.App"
-             xmlns:local="using:Presence.Desktop"
              RequestedThemeVariant="Default">
              <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
-
-    <Application.DataTemplates>
-        <local:ViewLocator/>
-    </Application.DataTemplates>
-  
     <Application.Styles>
         <FluentTheme />
     </Application.Styles>

Presence.Desktop/App.axaml.cs

@@ -20,13 +20,13 @@ namespace Presence.Desktop
             var serviceCollection = new ServiceCollection();
             serviceCollection.AddCommonService();
             var services = serviceCollection.BuildServiceProvider();
-            var mainViewModel = services.GetRequiredService<MainWindowViewModel>();
+            var mainViewModel = services.GetRequiredService<GroupViewModel>();
 
             if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
             {
-                desktop.MainWindow = new MainWindow
+                desktop.MainWindow = new MainWindow()
                 {
-                    DataContext = mainViewModel,
+                    DataContext = new MainWindowViewModel(services),
                 };
             }
 

Presence.Desktop/DI/ServiceColletionExtensions.cs

@@ -21,7 +21,7 @@ namespace Presence.Desktop.DI
              .AddSingleton<IUserRepository, SQLUserRepositoryImpl>()
              .AddTransient<IGroupUseCase, GroupUseCase>()
              .AddTransient<IUserUseCase, UserUseCase>()
-             .AddTransient<MainWindowViewModel>();
+             .AddTransient<GroupViewModel>();
         }
     }
 }

Presence.Desktop/Presence.Desktop.csproj

@@ -9,7 +9,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <Folder Include="Models\" />
     <AvaloniaResource Include="Assets\**" />
   </ItemGroup>
 

Presence.Desktop/ViewLocator.cs

@@ -2,31 +2,18 @@ using Avalonia.Controls;
 using Avalonia.Controls.Templates;
 using Presence.Desktop.ViewModels;
 using System;
+using Presence.Desktop.Views;
+using ReactiveUI;
 
 namespace Presence.Desktop
 {
-    public class ViewLocator : IDataTemplate
+    public class ViewLocator : IViewLocator
     {
-
+        public IViewFor? ResolveView<T>(T? viewModel, string? contract = null) => viewModel switch
-        public Control? Build(object? param)
         {
-            if (param is null)
+            GroupViewModel groupViewModel => new GroupView{DataContext = groupViewModel},
-                return null;
+            PresenceViewModel presenceViewModel => new PresenceView{DataContext = presenceViewModel},
-
+            _ => throw new ArgumentOutOfRangeException(nameof(viewModel))
-            var name = param.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+        };
-            var type = Type.GetType(name);
-
-            if (type != null)
-            {
-                return (Control)Activator.CreateInstance(type)!;
-            }
-
-            return new TextBlock { Text = "Not Found: " + name };
-        }
-
-        public bool Match(object? data)
-        {
-            return data is ViewModelBase;
-        }
     }
 }

Presence.Desktop/ViewModels/GroupViewModel.cs

@@ -0,0 +1,148 @@
+using Demo.Domain.UseCase;
+using Presence.Desktop.Models;
+using ReactiveUI;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Reactive;
+using System.Reactive.Linq;
+using Avalonia.Controls;
+using System.IO;
+using Demo.Domain.Models;
+
+namespace Presence.Desktop.ViewModels
+{
+    public class GroupViewModel : ViewModelBase, IRoutableViewModel
+    {
+        private readonly List<GroupPresenter> _groupPresentersDataSource = new List<GroupPresenter>();
+        private ObservableCollection<GroupPresenter> _groups;
+        public ObservableCollection<GroupPresenter> Groups => _groups;
+
+        public GroupPresenter? SelectedGroupItem { 
+            get => _selectedGroupItem; 
+            set => this.RaiseAndSetIfChanged(ref _selectedGroupItem, value); }
+
+        private GroupPresenter? _selectedGroupItem;
+
+        public ReactiveCommand<Unit, Unit> DeleteUsersByGroupCommand { get; }
+
+        public ReactiveCommand<Unit, Unit> ImportStudentsCommand { get; }
+
+        public ObservableCollection<UserPresenter> Users { get => _users;}
+        public ObservableCollection<UserPresenter> _users;
+
+        public GroupViewModel(IGroupUseCase groupUseCase, IUserUseCase userUseCase)
+        {
+            foreach (var item in groupUseCase.GetAllGroupsWithUsers())
+            {
+                GroupPresenter groupPresenter = new GroupPresenter
+                {
+                    Id = item.ID,
+                    Name = item.Name,
+                    users = item.Users?.Select(user => new UserPresenter
+                    {
+                        Name = user.FIO,
+                        Guid = user.Guid,
+                        Group = new GroupPresenter { Id = item.ID, Name = item.Name }
+                    }
+                    ).ToList()
+                };
+                _groupPresentersDataSource.Add(groupPresenter);
+            }
+            _groups = new ObservableCollection<GroupPresenter>(_groupPresentersDataSource);
+            
+            _users = new ObservableCollection<UserPresenter>();
+
+            DeleteUsersByGroupCommand = ReactiveCommand.Create(() => DeleteUsersByGroupID(userUseCase));
+
+            this.WhenAnyValue(vm => vm.SelectedGroupItem)
+                .Subscribe(_ => SetUsers());
+
+            ImportStudentsCommand = ReactiveCommand.CreateFromTask(async () =>
+            {
+                var openFileDialog = new OpenFileDialog
+                {
+                    Filters = new List<FileDialogFilter>
+                    {
+                        new FileDialogFilter { Name = "CSV Files", Extensions = { "csv" } }
+                    },
+                    AllowMultiple = false
+                };
+
+                var result = await openFileDialog.ShowAsync(new Window());
+                if (result?.Length > 0) {
+                    var filePath = result[0];
+                    ImportStudents(filePath, userUseCase);
+                }
+            });
+        }
+
+        private void ImportStudents(string filePath, IUserUseCase userUseCase)
+        {
+            if (SelectedGroupItem == null || SelectedGroupItem.Id == null)
+            {
+                return;
+            }
+            var lines = File.ReadAllLines(filePath);
+
+            foreach (var line in lines.Skip(1))
+            {
+                var columns = line.Split(',');
+                if (columns.Length < 1) continue;
+
+                var fio = columns[0];
+
+                var newUser = new User
+                {
+                    FIO = fio,
+                    Group = new Group
+                    {
+                        Name = SelectedGroupItem.Name,
+                        ID = SelectedGroupItem.Id
+                    }
+                };
+
+                var result = userUseCase.CreateUser(newUser);
+
+                if (result)
+                {
+                    var userPresenter = new UserPresenter
+                    {
+                        Name = fio,
+                        Guid = Guid.NewGuid(),
+                        Group = SelectedGroupItem
+                    };
+                    _users.Add(userPresenter);
+                }
+            }
+        }
+
+        private void DeleteUsersByGroupID(IUserUseCase userUseCase) {
+
+            if (SelectedGroupItem == null)
+                return;
+
+            var groupID = SelectedGroupItem.Id;
+            bool res = userUseCase.RemoveUsersByGroupID(groupID);
+
+            if (res) {
+                Users.Clear();
+            }
+        }
+
+        private void SetUsers()
+        {
+            if(SelectedGroupItem == null) return;
+            if (SelectedGroupItem.users == null) return;
+            Users.Clear();
+            foreach (var item in SelectedGroupItem.users)
+            {
+                Users.Add(item);
+            }
+        }
+
+        public string? UrlPathSegment { get; }
+        public IScreen HostScreen { get; }
+    }
+}

Presence.Desktop/ViewModels/MainWindowViewModel.cs

@@ -1,72 +1,16 @@
-using Demo.Domain.UseCase;
+using System;
-using DynamicData;
+using Microsoft.Extensions.DependencyInjection;
-using DynamicData.Binding;
-using Presence.Desktop.Models;
 using ReactiveUI;
-using System;
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-using System.Linq;
-using System.Reactive.Linq;
-using Tmds.DBus.Protocol;
 
-namespace Presence.Desktop.ViewModels
+namespace Presence.Desktop.ViewModels;
+
+public class MainWindowViewModel: ViewModelBase, IScreen
 {
-    public class MainWindowViewModel : ViewModelBase
+    public RoutingState Router { get; } = new RoutingState();
+
+    public MainWindowViewModel(IServiceProvider serviceProvider)
     {
-        private readonly IGroupUseCase _groupService;
+        var groupViewModel = serviceProvider.GetRequiredService<GroupViewModel>();
-        private List<GroupPresenter> groupPresentersDataSource = new List<GroupPresenter>();
+        Router.Navigate.Execute(groupViewModel);
-        private ObservableCollection<GroupPresenter> _groups;
-        public ObservableCollection<GroupPresenter> Groups => _groups;
-
-        public GroupPresenter? SelectedGroupItem { 
-            get => _selectedGroupItem; 
-            set => this.RaiseAndSetIfChanged(ref _selectedGroupItem, value); }
-
-        private GroupPresenter? _selectedGroupItem;
-
-
-
-        public ObservableCollection<UserPresenter> Users { get => _users;}
-        public ObservableCollection<UserPresenter> _users;
-        public MainWindowViewModel(IGroupUseCase groupUseCase)
-        {
-            _groupService = groupUseCase;
-
-            foreach (var item in _groupService.GetAllGroupsWithUsers())
-            {
-                GroupPresenter groupPresenter = new GroupPresenter
-                {
-                    Id = item.ID,
-                    Name = item.Name,
-                    users = item.Users?.Select(user => new UserPresenter
-                    {
-                        Name = user.FIO,
-                        Guid = user.Guid,
-                        Group = new GroupPresenter { Id = item.ID, Name = item.Name }
-                    }
-                    ).ToList()
-                };
-                groupPresentersDataSource.Add(groupPresenter);
-            }
-            _groups = new ObservableCollection<GroupPresenter>(groupPresentersDataSource);
-            
-            _users = new ObservableCollection<UserPresenter>();
-
-            this.WhenAnyValue(vm => vm.SelectedGroupItem)
-                .Subscribe(_ => SetUsers());
-
-        }
-
-        private void SetUsers()
-        {
-            if(SelectedGroupItem == null) return;
-            if (SelectedGroupItem.users == null) return;
-            Users.Clear();
-            foreach (var item in SelectedGroupItem.users)
-            {
-                Users.Add(item);
-            }
-        }
     }
 }

Presence.Desktop/ViewModels/PresenceViewModel.cs

@@ -0,0 +1,9 @@
+using ReactiveUI;
+
+namespace Presence.Desktop.ViewModels;
+
+public class PresenceViewModel: ViewModelBase, IRoutableViewModel
+{
+    public string? UrlPathSegment { get; }
+    public IScreen HostScreen { get; }
+}

Presence.Desktop/Views/GroupView.axaml

@@ -0,0 +1,46 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:Presence.Desktop.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Presence.Desktop.Views.GroupView"
+        x:DataType="vm:GroupViewModel">
+
+    <Design.DataContext>
+        <vm:GroupViewModel/>
+    </Design.DataContext>
+	<DockPanel Background="Black">
+		<StackPanel DockPanel.Dock="Bottom">
+			<TextBlock Text="List ↑" HorizontalAlignment="Center"/>
+		</StackPanel>
+		<StackPanel 
+			Spacing="10"
+			HorizontalAlignment="Center"
+			DockPanel.Dock="Top"
+			Orientation="Horizontal">
+			<TextBlock Text="Combobox ->"/>
+			<ComboBox  ItemsSource="{Binding Groups}" SelectedValue="{Binding SelectedGroupItem}">
+				<ComboBox.ItemTemplate>
+					<DataTemplate>
+						<TextBlock Text="{Binding Name}"/>
+					</DataTemplate>
+				</ComboBox.ItemTemplate>
+			</ComboBox>
+            <Button Content="Delete Users"
+                    Command="{Binding DeleteUsersByGroupCommand}"/>
+            <Button Content="Import Students" Command="{Binding ImportStudentsCommand}"/>
+		</StackPanel>
+		<Border>
+			<ListBox Background="Black" ItemsSource="{Binding Users}">
+				<ListBox.ItemTemplate>
+					<DataTemplate>
+						<StackPanel Orientation="Horizontal">
+							<TextBlock Text="{Binding Name}" />
+						</StackPanel>
+					</DataTemplate>
+				</ListBox.ItemTemplate>
+			</ListBox>
+		</Border>
+	</DockPanel>
+</UserControl>

Presence.Desktop/Views/GroupView.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
+using Presence.Desktop.ViewModels;
+using ReactiveUI;
+
+namespace Presence.Desktop.Views
+{
+    public partial class GroupView : ReactiveUserControl<GroupViewModel>
+    {
+        public GroupView()
+        {
+            this.WhenActivated(disposables => { });
+            AvaloniaXamlLoader.Load(this);
+        }
+    }
+}

Presence.Desktop/Views/MainWindow.axaml

@@ -1,47 +1,19 @@
 <Window xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:vm="using:Presence.Desktop.ViewModels"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:app="clr-namespace:Presence.Desktop"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:vm="using:Presence.Desktop.ViewModels"
+        xmlns:reactiveUi="http://reactiveui.net"
         mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
         x:Class="Presence.Desktop.Views.MainWindow"
         x:DataType="vm:MainWindowViewModel"
-        Icon="/Assets/avalonia-logo.ico"
+        Title="MainWindow">
-        Title="Presence.Desktop">
+    <DockPanel>
-
+        <reactiveUi:RoutedViewHost Router="{Binding Router}" DockPanel.Dock="Right" Background="Black">
-    <Design.DataContext>
+            <reactiveUi:RoutedViewHost.ViewLocator>
-        <vm:MainWindowViewModel/>
+                <app:ViewLocator/>
-    </Design.DataContext>
+            </reactiveUi:RoutedViewHost.ViewLocator>
-	<DockPanel Background="Azure">
+        </reactiveUi:RoutedViewHost>
-		<StackPanel DockPanel.Dock="Bottom">
+    </DockPanel>
-			<TextBlock Text="List ↑" HorizontalAlignment="Center"/>
-		</StackPanel>
-		<StackPanel 
-			Spacing="10"
-			HorizontalAlignment="Center"
-			DockPanel.Dock="Top"
-			Orientation="Horizontal">
-			<TextBlock Text="Combobox ->"/>
-			<ComboBox  ItemsSource="{Binding Groups}" SelectedValue="{Binding SelectedGroupItem}">
-				<ComboBox.ItemTemplate>
-					<DataTemplate>
-						<TextBlock Text="{Binding Name}"/>
-					</DataTemplate>
-				</ComboBox.ItemTemplate>
-			</ComboBox>
-			<ComboBox/>
-			<ComboBox/>
-		</StackPanel>
-		<Border>
-			<ListBox Background="Bisque" ItemsSource="{Binding Users}">
-				<ListBox.ItemTemplate>
-					<DataTemplate>
-						<StackPanel Orientation="Horizontal">
-							<TextBlock Text="{Binding Name}" />
-						</StackPanel>
-					</DataTemplate>
-				</ListBox.ItemTemplate>
-			</ListBox>
-		</Border>
-	</DockPanel>
 </Window>

Presence.Desktop/Views/MainWindow.axaml.cs

@@ -1,12 +1,18 @@
+using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
+using Presence.Desktop.ViewModels;
+using ReactiveUI;
 
-namespace Presence.Desktop.Views
+namespace Presence.Desktop.Views;
+
+public partial class MainWindow : ReactiveWindow<MainWindowViewModel>
 {
-    public partial class MainWindow : Window
+    public MainWindow()
     {
-        public MainWindow()
+        this.WhenActivated(disposables => { });
-        {
+        AvaloniaXamlLoader.Load(this);
-            InitializeComponent();
+
-        }
     }
 }

Presence.Desktop/Views/PresenceView.axaml

@@ -0,0 +1,8 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Presence.Desktop.Views.PresenceView">
+    Welcome to Avalonia!
+</UserControl>

Presence.Desktop/Views/PresenceView.axaml.cs

@@ -0,0 +1,16 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
+using Presence.Desktop.ViewModels;
+using ReactiveUI;
+
+namespace Presence.Desktop.Views;
+
+public partial class PresenceView : ReactiveUserControl<PresenceViewModel>
+{
+    public PresenceView()
+    {
+        this.WhenActivated(disposables => { });
+        AvaloniaXamlLoader.Load(this);    }
+}

data/Repository/IUserRepository.cs

@@ -8,6 +8,7 @@ namespace Demo.Data.Repository
         UserLocalEntity? GetUserByGuid(Guid guid);
         List<UserLocalEntity> GetUsersByGroupID(int groupID);
         bool RemoveUserByGuid(Guid guid);
+        bool RemoveUsersByGroupID(int GroupID);
         public UserLocalEntity? CreateUser(string FIO, string GroupName);
         UserLocalEntity? UpdateUser(UserLocalEntity updatedUser);
     }

data/Repository/UserRepositoryImpl.cs

@@ -47,6 +47,20 @@ namespace Demo.Data.Repository
             return true;
         }
 
+        public bool RemoveUsersByGroupID(int GroupID){
+            var delRecords = _remoteDatabaseContext.Users
+            .Where(x => x.GroupID == GroupID).ToList();
+
+            _remoteDatabaseContext.Users.RemoveRange(delRecords);
+            _remoteDatabaseContext.SaveChanges();
+
+            if (delRecords.Count == 0) {
+                return false;
+            }
+
+            return true;
+        }
+
         public UserLocalEntity? CreateUser(string FIO, string GroupName){
             var groupDAO = _remoteDatabaseContext.Groups.FirstOrDefault(x => x.Name == GroupName);
             UserDAO userDAO = new UserDAO{FIO = FIO, Guid = Guid.NewGuid(), GroupID = groupDAO.ID};

domain/UseCase/IUserUseCase.cs

@@ -6,6 +6,7 @@ namespace Demo.Domain.UseCase
     {
         List<User> GetAllUsers();
         bool RemoveUserByGuid(Guid userGuid);
+        bool RemoveUsersByGroupID(int GroupID);
         bool CreateUser(User user);
         User UpdateUser(User user);
         User GetUserByGuid(Guid userGuid);

domain/UseCase/UserUseCase.cs

@@ -70,6 +70,10 @@ namespace Demo.Domain.UseCase
            return _repositoryUserImpl.RemoveUserByGuid(userGuid);
         }
 
+        public bool RemoveUsersByGroupID(int GroupID) {
+            return _repositoryUserImpl.RemoveUsersByGroupID(GroupID);
+        }
+
         public User UpdateUser(User user)
         {
             UserLocalEntity userLocalEntity = new UserLocalEntity

students.csv

@@ -0,0 +1,3 @@
+FIO
+Zamir Bezgeev
+Yasha Lava