prevent add same user

src/Snap.Hutao/Snap.Hutao/Control/Cancellable/ISupportCancellation.cs

@@ -9,7 +9,7 @@ namespace Snap.Hutao.Control.Cancellable;
 public interface ISupportCancellation
 {
     /// <summary>
-    /// 用于通知取消的取消回执
+    /// 用于通知事件取消的取消令牌
     /// </summary>
     CancellationToken CancellationToken { get; set; }
 }

src/Snap.Hutao/Snap.Hutao/Service/Navigation/NavigationService.cs

@@ -49,7 +49,7 @@ internal class NavigationService : INavigationService
                 navigationView.BackRequested -= OnBackRequested;
             }
 
-            navigationView = Must.NotNull(value!, "NavigationView");
+            navigationView = Must.NotNull(value!);
 
             // add new listener
             if (navigationView != null)
@@ -138,7 +138,7 @@ internal class NavigationService : INavigationService
         {
             try
             {
-                await data.WaitForCompletionAsync();
+                await data.WaitForCompletionAsync().ConfigureAwait(false);
             }
             catch (AggregateException)
             {

src/Snap.Hutao/Snap.Hutao/Service/User/IUserService.cs

@@ -32,7 +32,7 @@ public interface IUserService
     /// </summary>
     /// <param name="user">待添加的用户</param>
     /// <returns>用户初始化是否成功</returns>
-    Task<bool> TryAddUserAsync(User user);
+    Task<UserAddResult> TryAddUserAsync(User user);
 
     /// <summary>
     /// 异步移除用户
@@ -47,4 +47,4 @@ public interface IUserService
     /// <param name="cookie">cookie的字符串形式</param>
     /// <returns>包含cookie信息的字典</returns>
     IDictionary<string, string> ParseCookie(string cookie);
-}
+}

src/Snap.Hutao/Snap.Hutao/Service/User/UserAddResult.cs

@@ -0,0 +1,25 @@
+// Copyright (c) DGP Studio. All rights reserved.
+// Licensed under the MIT license.
+
+namespace Snap.Hutao.Service.Abstraction;
+
+/// <summary>
+/// 用户添加操作结果
+/// </summary>
+public enum UserAddResult
+{
+    /// <summary>
+    /// 添加成功
+    /// </summary>
+    Ok,
+
+    /// <summary>
+    /// 已经存在该用户
+    /// </summary>
+    AlreadyExists,
+
+    /// <summary>
+    /// 初始化用户失败
+    /// </summary>
+    InitializeFailed,
+}

src/Snap.Hutao/Snap.Hutao/Service/User/UserService.cs

@@ -69,23 +69,41 @@ internal class UserService : IUserService
     }
 
     /// <inheritdoc/>
-    public async Task<bool> TryAddUserAsync(User user)
+    public async Task<UserAddResult> TryAddUserAsync(User user)
     {
-        if (await user.InitializeAsync(userClient, userGameRoleClient))
+        string? newUsersCookie = user.Cookie;
+
+        // Prevent users add same account.
+        bool userAlreadyExists = await appDbContext.Users
+            .AnyAsync(u => u.Cookie == newUsersCookie)
+            .ConfigureAwait(false);
+
+        if (userAlreadyExists)
         {
-            appDbContext.Users.Add(user);
+            return UserAddResult.AlreadyExists;
-            await appDbContext.SaveChangesAsync();
-            return true;
         }
 
-        return false;
+        bool userInitialized = await user
+            .InitializeAsync(userClient, userGameRoleClient)
+            .ConfigureAwait(false);
+
+        if (userInitialized)
+        {
+            appDbContext.Users.Add(user);
+            await appDbContext
+                .SaveChangesAsync()
+                .ConfigureAwait(false);
+            return UserAddResult.Ok;
+        }
+
+        return UserAddResult.InitializeFailed;
     }
 
     /// <inheritdoc/>
-    public async Task RemoveUserAsync(User user)
+    public Task RemoveUserAsync(User user)
     {
         appDbContext.Users.Remove(user);
-        await appDbContext.SaveChangesAsync();
+        return appDbContext.SaveChangesAsync();
     }
 
     /// <inheritdoc/>

src/Snap.Hutao/Snap.Hutao/View/Dialog/UserDialog.xaml

@@ -11,7 +11,7 @@
     Title="设置米游社Cookie"
     DefaultButton="Primary"
     PrimaryButtonText="请输入Cookie"
-    SecondaryButtonText="取消"
+    CloseButtonText="取消"
     Style="{StaticResource DefaultContentDialogStyle}">
 
     <StackPanel>

src/Snap.Hutao/Snap.Hutao/View/Dialog/UserDialog.xaml.cs

@@ -34,9 +34,7 @@ public sealed partial class UserDialog : ContentDialog
 
     private void InputTextChanged(object sender, TextChangedEventArgs e)
     {
-        string text = InputText.Text;
+        bool inputEmpty = string.IsNullOrEmpty(InputText.Text);
-
-        bool inputEmpty = string.IsNullOrEmpty(text);
 
         (PrimaryButtonText, IsPrimaryButtonEnabled) = inputEmpty switch
         {

src/Snap.Hutao/Snap.Hutao/View/Helper/NavHelper.cs

@@ -4,6 +4,7 @@
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
 using Snap.Hutao.Core;
+using Snap.Hutao.Service.Navigation;
 
 namespace Snap.Hutao.View.Helper;
 
@@ -13,7 +14,7 @@ namespace Snap.Hutao.View.Helper;
 public sealed class NavHelper
 {
     private static readonly DependencyProperty NavigateToProperty = Property<NavHelper>.Attach<Type>("NavigateTo");
-    private static readonly DependencyProperty ExtraDataProperty = Property<NavHelper>.Attach<object>("ExtraData");
+    private static readonly DependencyProperty ExtraDataProperty = Property<NavHelper>.Attach<INavigationExtra>("ExtraData");
 
     /// <summary>
     /// 获取导航项的目标页面类型
@@ -40,9 +41,9 @@ public sealed class NavHelper
     /// </summary>
     /// <param name="item">待获取的导航项</param>
     /// <returns>目标页面类型的额外数据</returns>
-    public static object? GetExtraData(NavigationViewItem? item)
+    public static INavigationExtra? GetExtraData(NavigationViewItem? item)
     {
-        return item?.GetValue(ExtraDataProperty);
+        return item?.GetValue(ExtraDataProperty) as INavigationExtra;
     }
 
     /// <summary>
@@ -50,7 +51,7 @@ public sealed class NavHelper
     /// </summary>
     /// <param name="item">待设置的导航项</param>
     /// <param name="value">新的目标页面类型</param>
-    public static void SetExtraData(NavigationViewItem item, object value)
+    public static void SetExtraData(NavigationViewItem item, INavigationExtra value)
     {
         item.SetValue(ExtraDataProperty, value);
     }

src/Snap.Hutao/Snap.Hutao/ViewModel/UserViewModel.cs

@@ -117,9 +117,9 @@ internal class UserViewModel : ObservableObject
         // user confirms the input
         if (result.IsOk)
         {
-            IDictionary<string, string> map = userService.ParseCookie(result.Value);
+            IDictionary<string, string> cookieMap = userService.ParseCookie(result.Value);
 
-            if (TryValidateCookie(map, out IDictionary<string, string>? filteredCookie))
+            if (TryValidateCookie(cookieMap, out IDictionary<string, string>? filteredCookie))
             {
                 string simplifiedCookie = string.Join(';', filteredCookie.Select(kvp => $"{kvp.Key}={kvp.Value}"));
                 User user = new()
@@ -128,13 +128,17 @@ internal class UserViewModel : ObservableObject
                     RemoveCommand = removeUserCommandCache,
                 };
 
-                if (!await userService.TryAddUserAsync(user))
+                switch (await userService.TryAddUserAsync(user))
                 {
-                    infoBarService.Warning("此Cookie无法获取用户信息，请重新输入");
+                    case UserAddResult.Ok:
-                }
+                        infoBarService.Success($"用户 [{user.UserInfo!.Nickname}] 添加成功");
-                else
+                        break;
-                {
+                    case UserAddResult.AlreadyExists:
-                    infoBarService.Success($"成功添加用户 [{user.UserInfo!.Nickname}]");
+                        infoBarService.Information($"用户 [{user.UserInfo!.Nickname}] 已经存在");
+                        break;
+                    case UserAddResult.InitializeFailed:
+                        infoBarService.Warning("此Cookie无法获取用户信息，请重新输入");
+                        break;
                 }
             }
             else
@@ -149,7 +153,7 @@ internal class UserViewModel : ObservableObject
         if (!User.IsNone(user))
         {
             await userService.RemoveUserAsync(user);
-            infoBarService.Success($"成功移除用户 [{user.UserInfo!.Nickname}]");
+            infoBarService.Success($"用户 [{user.UserInfo!.Nickname}] 成功移除");
         }
     }
 }