from datetime import datetime
from src.extensions import db

class Message(db.Model):
    __tablename__ = 'chat_messages'
    
    id = db.Column(db.Integer, primary_key=True)
    chat_id = db.Column(db.Integer, db.ForeignKey('chats.id', ondelete='CASCADE'), nullable=False)
    message = db.Column(db.Text, nullable=False)
    is_user = db.Column(db.Boolean, default=True)  
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    response_time = db.Column(db.Float, nullable=True)  
    tokens = db.Column(db.Integer, nullable=True) 
    
    chat = db.relationship('Chat', back_populates='messages')
    
    def __repr__(self):
        return f'<Message {self.id}>'
    
    def to_dict(self):
        return {
            'id': self.id,
            'chat_id': self.chat_id,
            'message': self.message,
            'is_user': self.is_user,
            'created_at': self.created_at.isoformat(),
            'response_time': self.response_time,
            'tokens': self.tokens
        }