from database import db
from datetime import datetime, timezone


class Message(db.Model):
    __tablename__ = "messages"

    id = db.Column(db.Integer, primary_key=True)
    chat_id = db.Column(db.Integer, db.ForeignKey("chats.id", ondelete="CASCADE"), nullable=False, index=True)
    user_id = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    role = db.Column(db.String(20), nullable=False)
    content = db.Column(db.Text, nullable=False)
    message_type = db.Column(db.String(20), default="text")
    created_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc))

    def to_dict(self):
        return {
            "id": self.id,
            "chat_id": self.chat_id,
            "role": self.role,
            "content": self.content,
            "message_type": self.message_type,
            "created_at": self.created_at.isoformat() if self.created_at else None
        }