Üzenetküldés frontenden

src/WorkFlowCheck.MAUI/App.xaml.cs

@@ -1,5 +1,8 @@
-using Microsoft.EntityFrameworkCore;
+using CommunityToolkit.Maui.Alerts;
+using CommunityToolkit.Maui.Core;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
+using System.Threading;
 using WorkFlowCheck.Common.DTO;
 using WorkFlowCheck.MAUI.DataLayer;
 using WorkFlowCheck.MAUI.Services;
@@ -10,22 +13,29 @@ namespace WorkFlowCheck.MAUI
     public partial class App : Application
     {
         private readonly AppDbContext _dbContext;
+        private readonly IUserService _userService;
+        private readonly ISyncService _syncService;
+        private CancellationTokenSource _cancellationTokenSource;
+
         public App(IServiceProvider serviceProvider)
         {
             InitializeComponent();
 
             _dbContext = serviceProvider.GetRequiredService<AppDbContext>();
+            _userService = serviceProvider.GetRequiredService<IUserService>();
+            _syncService = serviceProvider.GetRequiredService<ISyncService>();
 
             _dbContext.Database.EnsureDeleted(); // Adatbázis törlése
             _dbContext.Database.EnsureCreated(); // Új adatbázis létrehozása
 
-
+            StartBackgroundTask();
             MainPage = new AppShell();
             //MainPage = new NavigationPage(new MainPage(serviceProvider.GetRequiredService<IUserService>()));
 
         }
         protected async override void OnResume()
         {
+            StartBackgroundTask();
             base.OnResume();
             var isLogged = await SecureStorage.Default.GetAsync("WFCUser");
             if (isLogged == null)
@@ -35,6 +45,7 @@ namespace WorkFlowCheck.MAUI
         }
         protected override void OnSleep()
         {
+            _cancellationTokenSource?.Cancel();
             SecureStorage.Default.Remove("WFCUser");
             base.OnSleep();
         }
@@ -44,6 +55,67 @@ namespace WorkFlowCheck.MAUI
             SecureStorage.Default.Remove("WFCUser");
             await Shell.Current.GoToAsync("//LoginPage");
         }
+
+
+        private void StartBackgroundTask()
+        {
+            _cancellationTokenSource = new CancellationTokenSource();
+            Task.Run(() => BackgroundTask(_cancellationTokenSource.Token));
+        }
+        private async Task BackgroundTask(CancellationToken cancellationToken)
+        {
+            while (!cancellationToken.IsCancellationRequested)
+            {
+                try
+                {
+                    var userDTO = _userService.GetCurrentUser();
+
+                    if (userDTO != null && userDTO.Id > 0)
+                    {
+                        if (userDTO.RoleDTO?.Count > 0)
+                        {
+                            foreach (var roleDTO in userDTO.RoleDTO)
+                            {
+                                if (roleDTO.CanEnableBlocked)
+                                {
+                                    var deviceMessageDTOList = await _syncService.DeviceMessageReadUnreaded(_userService.DeviceId.ToUpper());
+                                    if (deviceMessageDTOList != null && deviceMessageDTOList.Count > 0)
+                                    {
+                                        await ShowSnackbar(deviceMessageDTOList[0].Message);
+                                        break;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+
+                }
+                await Task.Delay(TimeSpan.FromSeconds(5), cancellationToken);
+            }
+        }
+        private async Task ShowSnackbar(string message)
+        {
+            var visualOptions = new SnackbarOptions
+            {
+                ActionButtonTextColor = Colors.Yellow,
+                CornerRadius = new CornerRadius(5),
+                Font = Microsoft.Maui.Font.SystemFontOfSize(16),
+                BackgroundColor = Microsoft.Maui.Graphics.Color.Parse("Red"),
+                TextColor = Colors.Yellow
+
+            };
+            var snackbar = Snackbar.Make(message,
+                                         duration: TimeSpan.FromSeconds(10),
+                                         action: () => Console.WriteLine("Snackbar dismissed"),
+                                         actionButtonText: "OK",
+                                         visualOptions: visualOptions
+                                        );
+
+            await snackbar.Show();
+        }
         private async Task<ApiResponseDTO<UserDTO>> CheckSecurity()
         {
             var isLogged = await SecureStorage.Default.GetAsync("WFCUser");