fix: Refactor send_shop_order_invoice_telegram_task to use telebot for Telegram API integration

backend/order/tasks.py

@@ -134,10 +134,7 @@ def send_shop_order_invoice_telegram_task(shop_order_id, chat_id, bot_token):
     Returns:
         Success or error message
     """
-    import asyncio
-    import io
-    from telegram import Bot
-    from telegram.error import TelegramError
+    import telebot
     from .invoice_generator import generate_shop_order_invoice
     from .models import ShopOrderModel
 
@@ -145,29 +142,21 @@ def send_shop_order_invoice_telegram_task(shop_order_id, chat_id, bot_token):
         # Get the shop order
         shop_order = ShopOrderModel.objects.get(pk=shop_order_id)
 
-        # Generate invoice PDF
+        # Generate invoice PDF (should return a file-like object)
         pdf_buffer = generate_shop_order_invoice(shop_order_id)
+        if hasattr(pdf_buffer, 'seek'):
+            pdf_buffer.seek(0)
 
-        # Reset buffer position
-        pdf_buffer.seek(0)
+        caption = f'فاکتور سفارش #{shop_order_id}\n{shop_order.shop.shop_name}'
 
-        # Send via Telegram
-        async def send_invoice():
-            bot = Bot(token=bot_token)
-            await bot.send_document(
-                chat_id=chat_id,
-                document=pdf_buffer,
-                filename=f'invoice_shop_order_{shop_order_id}.pdf',
-                caption=f'فاکتور سفارش #{shop_order_id}\n{shop_order.shop.shop_name}'
-            )
-        
-        # Run async function - create new event loop for Celery context
-        loop = asyncio.new_event_loop()
-        asyncio.set_event_loop(loop)
-        try:
-            loop.run_until_complete(send_invoice())
-        finally:
-            loop.close()
+        # Initialize bot and send document
+        bot = telebot.TeleBot(bot_token)
+        bot.send_document(
+            chat_id=chat_id,
+            document=pdf_buffer,
+            caption=caption,
+            visible_file_name=f'invoice_shop_order_{shop_order_id}.pdf'
+        )
 
         logging.info(f'Successfully sent shop order invoice {shop_order_id} to Telegram chat {chat_id}')
         return f'Invoice sent successfully to chat {chat_id}'
@@ -176,8 +165,8 @@ def send_shop_order_invoice_telegram_task(shop_order_id, chat_id, bot_token):
         error_msg = f'ShopOrderModel with id {shop_order_id} does not exist'
         logging.error(error_msg)
         return error_msg
-    except TelegramError as e:
-        error_msg = f'Telegram error sending invoice {shop_order_id}: {str(e)}'
+    except telebot.apihelper.ApiException as e:
+        error_msg = f'Telegram API error sending invoice {shop_order_id}: {str(e)}'
         logging.error(error_msg)
         return error_msg
     except Exception as e: