Unavailable store item message (#31)

modules/ContentStore/Handler/Store.cs

@@ -106,38 +106,55 @@ public class Store : BotEventHandler
                 return;
             }
 
+            try
+            {
+                await PerformPurchase(mediaService, messageId);
+            }
+            catch (Exception e)
+            {
+                answer = "Товар недоступен";
+                await Bot.EditMessageTextAsync(Chat.Id,
+                    messageId,
+                    $"<b>{From.ToHtml()} попытался купить \"{storeItem.Name}\", но товара в наличии не оказалось.");
+                await AnswerQuery(query.Id, answer);
+                return;
+            }
+
             reputation = await _reputation.SetUserReputationAsync(Chat, From, reputation - storeItem.Price);
             await Bot.EditMessageTextAsync(Chat.Id, 
                 messageId, 
                 $"<b>{From.ToHtml()} ({reputation})</b> купил \"{storeItem.Name}\".",
                 ParseMode.Html);
-
-            var randomMedia = await mediaService!.GetRandomMediaAsync();
-            var file = randomMedia.File;
-
-            switch (randomMedia.Type)
-            {
-                case InputMediaType.Photo:
-                    await Bot.SendPhotoAsync(Chat.Id, file, 
-                        caption: randomMedia.Caption, 
-                        replyToMessageId: messageId, 
-                        parseMode: ParseMode.Html, 
-                        hasSpoiler: randomMedia.Nsfw
-                    );
-                    break;
-                case InputMediaType.Video:
-                    await Bot.SendVideoAsync(Chat.Id, file, 
-                        caption: randomMedia.Caption, 
-                        replyToMessageId: messageId,
-                        parseMode: ParseMode.Html,
-                        hasSpoiler: randomMedia.Nsfw
-                    );
-                    break;
-            }
         }
 
         await AnswerQuery(query.Id, answer);
     }
+
+    private async Task PerformPurchase(IRandomMediaService mediaService, int messageId)
+    {
+        var randomMedia = await mediaService!.GetRandomMediaAsync();
+        var file = randomMedia.File;
+
+        switch (randomMedia.Type)
+        {
+            case InputMediaType.Photo:
+                await Bot.SendPhotoAsync(Chat.Id, file, 
+                    caption: randomMedia.Caption, 
+                    replyToMessageId: messageId, 
+                    parseMode: ParseMode.Html, 
+                    hasSpoiler: randomMedia.Nsfw
+                );
+                break;
+            case InputMediaType.Video:
+                await Bot.SendVideoAsync(Chat.Id, file, 
+                    caption: randomMedia.Caption, 
+                    replyToMessageId: messageId,
+                    parseMode: ParseMode.Html,
+                    hasSpoiler: randomMedia.Nsfw
+                );
+                break;
+        }
+    }
     
     private bool TryGetMediaService(string name, out IRandomMediaService? mediaService)
     {