feat: added DI to Client

JOBot.TClient/Core/HostedServices/BotBackgroundService.cs

@@ -0,0 +1,45 @@
+using JOBot.TClient.Commands;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+
+namespace JOBot.TClient.Core.HostedServices;
+
+using Telegram.Bot;
+using Telegram.Bot.Types;
+using Microsoft.Extensions.Hosting;
+
+public sealed class BotBackgroundService(
+    ITelegramBotClient botClient,
+    IServiceProvider services,
+    ILogger<BotBackgroundService> logger)
+    : BackgroundService
+{
+    protected override Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        botClient.StartReceiving(
+            updateHandler: HandleUpdateAsync,
+            errorHandler: HandleErrorAsync,
+            cancellationToken: stoppingToken);
+        
+        return Task.CompletedTask;
+    }
+
+    private async Task HandleUpdateAsync(ITelegramBotClient bot, Update update, CancellationToken ct)
+    {
+        using var scope = services.CreateScope();
+        var commands = new Dictionary<string, ITelegramCommand>
+        {
+            ["/start"] = scope.ServiceProvider.GetRequiredService<StartCommand>()
+        };
+
+        if (update.Message?.Text is { } text && commands.TryGetValue(text, out var command))
+            await command.ExecuteAsync(update, ct);
+    }
+
+    private Task HandleErrorAsync(ITelegramBotClient bot, Exception ex, CancellationToken ct)
+    {
+        services.CreateScope();
+        logger.LogError(ex, ex.Message);
+        return Task.CompletedTask;
+    }
+}