"""TrustEvent model. Append-only events that adjust a user's trust score."""
from datetime import datetime
from app.extensions import db
from app.models.enums import TrustEventType


class TrustEvent(db.Model):
    __tablename__ = "trust_events"

    id = db.Column(db.BigInteger().with_variant(db.Integer, "sqlite"), primary_key=True, autoincrement=True)
    user_id = db.Column(db.BigInteger, db.ForeignKey("users.id"), nullable=False, index=True)
    type = db.Column(db.Enum(TrustEventType), nullable=False)
    delta = db.Column(db.Integer, nullable=False, default=0)
    created_at = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)

    user = db.relationship("User", back_populates="trust_events")

    def __repr__(self):
        return f"<TrustEvent u{self.user_id} {self.type.value} {self.delta:+d}>"