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Telegrator/Providers/AwaitingProvider.cs

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+using Telegram.Bot;
+using Telegram.Bot.Types;
+using Telegrator.Configuration;
+using Telegrator.MadiatorCore;
+using Telegrator.MadiatorCore.Descriptors;
+
+namespace Telegrator.Providers
+{
+    /// <summary>
+    /// Provider for managing awaiting handlers that can wait for specific update types.
+    /// Extends HandlersProvider to provide functionality for creating and managing awaiter handlers.
+    /// </summary>
+    /// <param name="options">The bot configuration options.</param>
+    /// <param name="botInfo">The bot information.</param>
+    public class AwaitingProvider(TelegramBotOptions options, ITelegramBotInfo botInfo) : HandlersProvider([], options, botInfo), IAwaitingProvider
+    {
+        /// <summary>
+        /// List of handler descriptors for awaiting handlers.
+        /// </summary>
+        protected readonly HandlerDescriptorList HandlersList = [];
+
+        /// <inheritdoc/>
+        public override IEnumerable<DescribedHandlerInfo> GetHandlers(IUpdateRouter updateRouter, ITelegramBotClient client, Update update, CancellationToken cancellationToken = default)
+        {
+            return DescribeDescriptors(HandlersList, updateRouter, client, update, cancellationToken);
+        }
+
+        /// <inheritdoc/>
+        public IDisposable UseHandler(HandlerDescriptor handlerDescriptor)
+        {
+            HandlerToken handlerToken = new HandlerToken(HandlersList, handlerDescriptor);
+            handlerToken.Register();
+            return handlerToken;
+        }
+
+        /// <summary>
+        /// Token for managing the lifetime of a handler in the awaiting provider.
+        /// Implements IDisposable to automatically remove the handler when disposed.
+        /// </summary>
+        /// <param name="handlersList">The list of handler descriptors.</param>
+        /// <param name="handlerDescriptor">The handler descriptor to manage.</param>
+        private readonly struct HandlerToken(HandlerDescriptorList handlersList, HandlerDescriptor handlerDescriptor) : IDisposable
+        {
+            /// <summary>
+            /// Registers the handler descriptor in the handlers list.
+            /// </summary>
+            /// <exception cref="Exception">Thrown when the handler descriptor has no singleton instance.</exception>
+            public readonly void Register()
+            {
+                if (handlerDescriptor.SingletonInstance == null)
+                    throw new Exception();
+
+                handlersList.Add(handlerDescriptor);
+            }
+
+            /// <summary>
+            /// Disposes of the handler token by removing the handler descriptor from the list.
+            /// </summary>
+            public readonly void Dispose()
+            {
+                handlersList.Remove(handlerDescriptor.Indexer);
+            }
+        }
+    }
+}