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from typing import List, Optional
from sqlalchemy.orm import Session
from datetime import datetime
from models.conversation import Conversation, Message
from models.agent import Agent
from models.user import User
class ConversationService:
"""
Service for managing conversations and messages.
Handles auto-creation of conversations and message persistence.
"""
def get_or_create_conversation(
self,
db: Session,
agent_id: int,
user_id: int
) -> Conversation:
"""Get existing conversation or create a new one."""
conversation = db.query(Conversation).filter(
Conversation.agent_id == agent_id,
Conversation.user_id == user_id
).first()
if not conversation:
conversation = Conversation(
agent_id=agent_id,
user_id=user_id
)
db.add(conversation)
db.commit()
db.refresh(conversation)
return conversation
def add_message(
self,
db: Session,
conversation_id: int,
role: str,
content: str,
multimodal_data: dict = None,
explainability_data: dict = None,
confidence: float = None
) -> Message:
"""Add a message to a conversation."""
message = Message(
conversation_id=conversation_id,
role=role,
content=content,
multimodal_data=multimodal_data,
explainability_data=explainability_data,
confidence=confidence
)
db.add(message)
# Update conversation timestamp
conversation = db.query(Conversation).filter(
Conversation.id == conversation_id
).first()
if conversation:
conversation.updated_at = datetime.utcnow()
db.commit()
db.refresh(message)
return message
def get_messages(
self,
db: Session,
conversation_id: int,
limit: int = 50
) -> List[Message]:
"""Get messages from a conversation."""
return db.query(Message).filter(
Message.conversation_id == conversation_id
).order_by(Message.timestamp.asc()).limit(limit).all()
def get_conversation_history(
self,
db: Session,
agent_id: int,
user_id: int,
limit: int = 50
) -> List[dict]:
"""Get conversation history for an agent-user pair."""
conversation = db.query(Conversation).filter(
Conversation.agent_id == agent_id,
Conversation.user_id == user_id
).first()
if not conversation:
return []
messages = self.get_messages(db, conversation.id, limit)
return [
{
"id": msg.id,
"role": msg.role,
"content": msg.content,
"timestamp": msg.timestamp,
"confidence": msg.confidence,
"explainability": msg.explainability_data
}
for msg in messages
]
def list_conversations(
self,
db: Session,
user_id: int
) -> List[dict]:
"""List all conversations for a user."""
conversations = db.query(Conversation).filter(
Conversation.user_id == user_id
).order_by(Conversation.updated_at.desc()).all()
return [
{
"id": conv.id,
"agent_id": conv.agent_id,
"created_at": conv.created_at,
"updated_at": conv.updated_at,
"message_count": len(conv.messages)
}
for conv in conversations
]
def delete_conversation(self, db: Session, conversation_id: int, user_id: int) -> bool:
"""Delete a conversation (with ownership check)."""
conversation = db.query(Conversation).filter(
Conversation.id == conversation_id,
Conversation.user_id == user_id
).first()
if not conversation:
return False
db.delete(conversation)
db.commit()
return True
# Singleton instance
conversation_service = ConversationService()
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