added /start message handling

Program.cs

@@ -1,7 +1,9 @@
-using Microsoft.Extensions.Logging;
+using CatsOfMastodonBot.Services;
+using Microsoft.Extensions.Logging;
 using mstdnCats.Services;
 using Telegram.Bot;
 using Telegram.Bot.Types;
+using Telegram.Bot.Types.Enums;
 
 public class MastodonBot
 {
@@ -19,7 +21,8 @@ public class MastodonBot
         });
         var logger = loggerFactory.CreateLogger<MastodonBot>();
 
-        if(!CheckEnv.IsValid()){
+        if (!CheckEnv.IsValid())
+        {
             logger.LogCritical("Error reading envinonment variables, either some values are missing or no .env file was found");
             throw new Exception("Error reading envinonment variables, either some values are missing or no .env file was found");
         }
@@ -39,26 +42,36 @@ public class MastodonBot
         var me = await bot.GetMeAsync();
         await bot.DropPendingUpdatesAsync();
         bot.OnUpdate += OnUpdate;
+        bot.OnMessage += OnMessage;
 
         logger.LogInformation($"Bot is running as {me.FirstName}.");
 
-
-
         // Handle bot updates
         async Task OnUpdate(Update update)
         {
             switch (update)
             {
-                    case { CallbackQuery: { } callbackQuery }: await HandlePostAction.HandleCallbackQuery(callbackQuery, db, bot, logger); break;
+                case { CallbackQuery: { } callbackQuery }: {
+                    if(callbackQuery.Data == "new_random") await HandleStartMessage.HandleStartMessageAsync(callbackQuery.Message, bot, db, logger);
+                    else await HandlePostAction.HandleCallbackQuery(callbackQuery, db, bot, logger); break;
+                   
+                }
                 default: logger.LogInformation($"Received unhandled update {update.Type}"); break;
             };
         }
 
+        // Handle bot messages
+        async Task OnMessage(Message message, UpdateType type)
+        {
+            if (message.Text == "/start")
+            {
+                await HandleStartMessage.HandleStartMessageAsync(message,bot, db, logger);
+            }
+        }
+
         // Set a timer to fetch and process posts every 15 minutes
         _timer = new Timer(async _ => await RunCheck.runAsync(db, bot, DotNetEnv.Env.GetString("TAG"), logger, DotNetEnv.Env.GetString("CUSTOM_INSTANCE")), null, TimeSpan.Zero, TimeSpan.FromMinutes(15));
         Console.ReadLine();
-        
-
     }
 
 }

Services/HandleStartMessage.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
+using JsonFlatFileDataStore;
+using Microsoft.Extensions.Logging;
+using mstdnCats.Models;
+using Telegram.Bot;
+using Telegram.Bot.Types;
+using Telegram.Bot.Types.Enums;
+using Telegram.Bot.Types.ReplyMarkups;
+
+namespace CatsOfMastodonBot.Services
+{
+    public class HandleStartMessage
+    {
+        public static async Task HandleStartMessageAsync(Message message, TelegramBotClient _bot, IDocumentCollection<Post> _db, ILogger<MastodonBot>? logger)
+        {
+            // choose all media attachments that are approved
+            var mediaAttachmentsToSelect = _db.AsQueryable().Where(p => p.MediaAttachments.Any(m => m.Approved == true)).ToList();
+            // select random approved media attachment
+            var selectedMediaAttachment = mediaAttachmentsToSelect[new Random().Next(mediaAttachmentsToSelect.Count)];
+            // send media attachment
+            await _bot.SendPhotoAsync(message.Chat.Id, selectedMediaAttachment.MediaAttachments.FirstOrDefault(m => m.Approved == true).Url,
+            caption: $"<a href=\"" + selectedMediaAttachment.Url + "\">" + $"Here is your cat!" + "</br>" + "View on Mastodon 🐈" + " </a>", parseMode: ParseMode.Html
+                        , replyMarkup: new InlineKeyboardMarkup().AddButton(InlineKeyboardButton.WithUrl("Join channel 😺", selectedMediaAttachment.Url))
+                        .AddNewRow()
+                        .AddButton(InlineKeyboardButton.WithCallbackData("Send me another one!", $"new_random")));
+
+
+        }
+    }
+}