import uuid
from datetime import datetime, timezone
from sqlalchemy import Column, String, DateTime
from backend.app.core.database import Base


def generate_uuid() -> str:
    return str(uuid.uuid4())


def utc_now() -> datetime:
    return datetime.now(timezone.utc)


class BaseModel(Base):
    __abstract__ = True

    id = Column(String(36), primary_key=True, default=generate_uuid)
    created_at = Column(DateTime(timezone=True), default=utc_now, nullable=False)
    updated_at = Column(
        DateTime(timezone=True),
        default=utc_now,
        onupdate=utc_now,
        nullable=False,
    )