[CHANGE] Preparing client init

Manager.App/Services/System/ClientManager.cs

@@ -1,3 +1,6 @@
+using System.Net;
+using DotBased.Monads;
+using Manager.Data.Entities.LibraryContext;
 using Manager.YouTube;
 
 namespace Manager.App.Services.System;
@@ -5,11 +8,37 @@ namespace Manager.App.Services.System;
 public class ClientManager : BackgroundService
 {
     private readonly List<YouTubeClient> _clients = [];
+    private bool _cancelled;
     
-    protected override Task ExecuteAsync(CancellationToken stoppingToken)
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
-        throw new NotImplementedException();
+        stoppingToken.Register(CancellationRequested);
+    }
+
+    private void CancellationRequested()
+    {
+        _cancelled = true;
+        // Clear up
+    }
+
+    public async Task<Result<YouTubeClient>> LoadClient(ClientAccountEntity accountEntity)
+    {
+        var container = new CookieContainer();
+
+        if (accountEntity.HttpCookies.Count != 0)
+        {
+            var cookieColl = new CookieCollection();
+            foreach (var cookieEntity in accountEntity.HttpCookies)
+            {
+                cookieColl.Add(new Cookie(cookieEntity.Name, cookieEntity.Value, cookieEntity.Domain));
+            }
+            
+            container.Add(cookieColl);
+        }
+        
+        var ytClient = new YouTubeClient(container, accountEntity.UserAgent ?? "");
+        await ytClient.GetStateAsync();
+
+        return ytClient;
     }
-    
-    
 }