Video adding and subscriptions finished

VDownload.Core/Services/DownloadTasksCollectionManagement.cs

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+using Microsoft.Toolkit.Uwp.Connectivity;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using VDownload.Core.Structs;
+
+namespace VDownload.Core.Services
+{
+    public static class DownloadTasksCollectionManagement
+    {
+        #region PROPERTIES
+
+        private static readonly Dictionary<string, DownloadTask> ChangeableDownloadTasksCollection = new Dictionary<string, DownloadTask>();
+        public static readonly ReadOnlyDictionary<string, DownloadTask> DownloadTasksCollection = new ReadOnlyDictionary<string, DownloadTask>(ChangeableDownloadTasksCollection);
+
+        #endregion
+
+
+
+        #region PUBLIC METHODS
+
+        public static string GenerateID()
+        {
+            char[] idChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".ToCharArray();
+            int idLength = 10;
+
+            string id;
+            do
+            {
+                id = "";
+                while (id.Length < idLength)
+                {
+                    id += idChars[new Random().Next(0, idChars.Length)];
+                }
+            } while (DownloadTasksCollection.Keys.Contains(id));
+
+            return id;
+        }
+
+        public static void Add(DownloadTask downloadTask, string id)
+        {
+            ChangeableDownloadTasksCollection[id] = downloadTask;
+        }
+
+        public static void Remove(string id)
+        {
+            ChangeableDownloadTasksCollection.Remove(id);
+        }
+
+        public static async Task WaitInQueue(bool delayWhenOnMeteredConnection, CancellationToken cancellationToken = default)
+        {
+            while ((ChangeableDownloadTasksCollection.Values.Where((DownloadTask task) => task.Status == Enums.DownloadTaskStatus.Downloading || task.Status == Enums.DownloadTaskStatus.Processing || task.Status == Enums.DownloadTaskStatus.Finalizing).Count() >= (int)Config.GetValue("max_active_video_task") || (delayWhenOnMeteredConnection && NetworkHelper.Instance.ConnectionInformation.IsInternetOnMeteredConnection)) && !cancellationToken.IsCancellationRequested)
+            {
+                await Task.Delay(100);
+            }
+        }
+
+        #endregion
+    }
+}