Fixed entire calendar layout + chat layout + chat history

backend/modules/nlp/service.py

@@ -1,8 +1,14 @@
 # modules/nlp/service.py
 
+from sqlalchemy.orm import Session
+from sqlalchemy import desc # Import desc for ordering
 from google import genai
 import json
 from datetime import datetime, timezone
+from typing import List # Import List
+
+# Import the new model and Enum
+from .models import ChatMessage, MessageSender
 # from core.config import settings
 
 # client = genai.Client(api_key=settings.GOOGLE_API_KEY)
@@ -70,6 +76,27 @@ Here is some context for you:
 Here is the user request:
 
 """
+
+# --- Chat History Service Functions ---
+
+def save_chat_message(db: Session, user_id: int, sender: MessageSender, text: str):
+    """Saves a chat message to the database."""
+    db_message = ChatMessage(user_id=user_id, sender=sender, text=text)
+    db.add(db_message)
+    db.commit()
+    db.refresh(db_message)
+    return db_message
+
+def get_chat_history(db: Session, user_id: int, limit: int = 50) -> List[ChatMessage]:
+    """Retrieves the last 'limit' chat messages for a user."""
+    return db.query(ChatMessage)\
+             .filter(ChatMessage.user_id == user_id)\
+             .order_by(desc(ChatMessage.timestamp))\
+             .limit(limit)\
+             .all()[::-1] # Reverse to get oldest first for display order
+
+# --- Existing NLP Service Functions ---
+
 def process_request(request: str):
     """
     Process the user request using the Google GenAI API.