fix: combine session image and text into single Telegram message

When creating a session with an image, send it as a single SendPhoto with the schedule text as caption (+ reply markup), instead of two separate messages. Falls back to two messages if caption exceeds Telegram's 1024-char limit. Also adds BatchMessageEditor helper that transparently handles EditMessageText vs EditMessageCaption depending on whether the batch message is a text or photo message. Updated all handlers and web service to use this helper. Version bump to 1.9.7.
2026-05-04 10:33:06 +03:00
parent aefed5abd4
commit c874f7b797
13 changed files with 119 additions and 36 deletions
@@ -0,0 +1,51 @@
+using Telegram.Bot;
+using Telegram.Bot.Types.Enums;
+using Telegram.Bot.Types.ReplyMarkups;
+
+namespace GmRelay.Shared.Rendering;
+
+/// <summary>
+/// Handles editing batch messages that may be either text or photo messages.
+/// When the batch was created with SendPhoto (image + caption), we need
+/// EditMessageCaption instead of EditMessageText.
+/// </summary>
+public static class BatchMessageEditor
+{
+    /// <summary>
+    /// Edits a batch message, automatically detecting whether it is a text or photo message.
+    /// Tries EditMessageText first; on failure falls back to EditMessageCaption.
+    /// </summary>
+    public static async Task EditBatchMessageAsync(
+        ITelegramBotClient bot,
+        long chatId,
+        int messageId,
+        string text,
+        InlineKeyboardMarkup? replyMarkup,
+        CancellationToken ct = default)
+    {
+        try
+        {
+            await bot.EditMessageText(
+                chatId: chatId,
+                messageId: messageId,
+                text: text,
+                parseMode: ParseMode.Html,
+                replyMarkup: replyMarkup,
+                cancellationToken: ct);
+        }
+        catch (Telegram.Bot.Exceptions.ApiRequestException ex)
+            when (ex.Message.Contains("there is no text in the message", StringComparison.OrdinalIgnoreCase))
+        {
+            // The batch message is a photo — use EditMessageCaption instead.
+            // Caption is limited to 1024 chars; if text exceeds that, truncate gracefully.
+            var caption = text.Length <= 1024 ? text : text[..1021] + "...";
+            await bot.EditMessageCaption(
+                chatId: chatId,
+                messageId: messageId,
+                caption: caption,
+                parseMode: ParseMode.Html,
+                replyMarkup: replyMarkup,
+                cancellationToken: ct);
+        }
+    }
+}