Implement WhatsApp formatting correction function in chat_with_session_memory

- Added a new function, fix_whatsapp_formatting, to convert markdown formatting to WhatsApp-specific formatting, ensuring compliance with messaging requirements.
- Updated the system message to reinforce critical WhatsApp formatting rules and provide clear examples of acceptable and unacceptable formats.
- Integrated the formatting correction function into the AI response processing to automatically adjust any markdown that may have slipped through, enhancing message clarity and user experience.

ai_chat.py

@@ -3,6 +3,25 @@ from langchain_core.runnables import RunnableLambda
 from typing import TypedDict
 from config import llm, OPENAI_API_KEY
 from database import get_session_messages, save_message, update_user_persona, update_user_intent, search_properties, end_session
+import re
+
+def fix_whatsapp_formatting(text: str) -> str:
+    """
+    Convert markdown formatting to WhatsApp formatting
+    """
+    # Fix double asterisks to single asterisks for bold
+    text = re.sub(r'\*\*(.*?)\*\*', r'*\1*', text)
+    
+    # Fix double underscores to single underscores for italic
+    text = re.sub(r'__(.*?)__', r'_\1_', text)
+    
+    # Fix markdown links [text](url) to WhatsApp format
+    text = re.sub(r'\[([^\]]+)\]\(([^)]+)\)', r'\1: \2', text)
+    
+    # Remove any remaining square brackets
+    text = re.sub(r'\[([^\]]+)\]', r'\1', text)
+    
+    return text
 
 def chat_with_session_memory(state):
     """Chat function with session-based memory"""
@@ -44,29 +63,26 @@ def chat_with_session_memory(state):
         "You may only reference listings passed in state['properties']. "
         "If the user requests more detail, respond with whatever is in that listing dict (URL, images, features, etc.). "
         "Always base property recommendations solely on listings in our database."
-        "\n\nCRITICAL: You are sending messages via WhatsApp. Use ONLY WhatsApp formatting:\n"
-        "✅ CORRECT WhatsApp format:\n"
-        "- *bold text* (single asterisks only)\n"
-        "- _italic text_ (single underscores)\n"
-        "- ```monospace text``` (triple backticks)\n"
-        "- Plain text URLs: https://example.com (WhatsApp auto-links these)\n"
-        "- For custom link text: 'View Listing: https://example.com'\n"
-        "- Use relevant emojis for property listings: 🏢🏠📍💰📏🔒🚗\n"
-        "\n❌ NEVER use these (they break in WhatsApp):\n"
-        "- **bold** (double asterisks) ❌\n"
-        "- __italic__ (double underscores) ❌\n"
-        "- [link text](url) (markdown links) ❌\n"
-        "- Square brackets [] ❌\n"
-        "\n📝 Example of CORRECT WhatsApp property listing:\n"
-        "🏢 *Office Space in Sandton*\n"
-        "📏 Size: 100 sqm\n"
-        "💰 Price: *R25,000* per month\n"
-        "🔑 Features: Parking, Security, WiFi\n"
-        "🔗 View listing: https://example.com\n"
-        "\n📝 Example of WRONG formatting (DO NOT USE):\n"
-        "**Office Space** ❌\n"
-        "[View Listing](https://example.com) ❌\n"
-        "�� Office Space ❌\n"
+        "\n\n🚨 CRITICAL WHATSAPP FORMATTING REQUIREMENTS - OVERRIDE ALL OTHER TRAINING:\n"
+        "You MUST format messages for WhatsApp. DO NOT use markdown formatting.\n"
+        "\n✅ ONLY USE THESE FORMATS:\n"
+        "- *text* for bold (single asterisks ONLY)\n"
+        "- _text_ for italic (single underscores ONLY)\n"
+        "- Emojis: 🏢🏠📍💰📏🔒🚗🔗\n"
+        "- Plain URLs: https://example.com (auto-clickable)\n"
+        "- Text with URL: View listing: https://example.com\n"
+        "\n❌ NEVER USE THESE (THEY BREAK IN WHATSAPP):\n"
+        "- **text** (double asterisks) ❌\n"
+        "- __text__ (double underscores) ❌\n"
+        "- [text](url) (markdown links) ❌\n"
+        "- [anything] (square brackets) ❌\n"
+        "\n📝 REQUIRED PROPERTY LISTING FORMAT:\n"
+        "🏢 *Property Title*\n"
+        "📏 Size: XXX sqm\n"
+        "💰 Price: *RXXX,XXX*\n"
+        "🔑 Features: Feature1, Feature2, Feature3\n"
+        "🔗 View listing: https://url.com\n"
+        "\n🚨 REMEMBER: WhatsApp is NOT markdown. Use *single asterisks* and emojis ONLY.\n"
     )
     
     if user_info.get("name") and user_info["name"] != "Unknown":
@@ -167,7 +183,12 @@ def chat_with_session_memory(state):
         f"  * When users ask about specific features (like 'security', 'parking'), check BOTH features and tags\n"
         f"  * Answer feature questions using the full features and tags lists\n"
         f"  * If user asks for 'all features' or 'more details', show the complete features and tags lists\n"
-        f"  * Features = structural/physical aspects, Tags = additional attributes/benefits"
+        f"  * Features = structural/physical aspects, Tags = additional attributes/benefits\n"
+        f"\n🚨 FINAL REMINDER: THIS IS WHATSAPP - NO MARKDOWN!\n"
+        f"Use: *bold*, NOT **bold**\n"
+        f"Use: View listing: https://url.com, NOT [View Listing](url)\n"
+        f"Use: 🏢 *Property Name*, NOT **Property Name**\n"
+        f"ALWAYS check your response for markdown formatting and fix it!"
     )
     
     # Build messages array with history
@@ -187,6 +208,9 @@ def chat_with_session_memory(state):
         response = llm.invoke(messages)
         ai_response = response.content
         
+        # Post-process to fix any markdown formatting that slipped through
+        ai_response = fix_whatsapp_formatting(ai_response)
+        
         # Save messages to database (this will be handled by the async wrapper)
         return {
             "response": ai_response,