import uuid
from datetime import datetime

from sqlalchemy import func
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column


class Base(DeclarativeBase):
    pass


class UUIDMixin:
    id: Mapped[uuid.UUID] = mapped_column(
        primary_key=True,
        default=uuid.uuid4,
    )


class TimestampMixin:
    created_at: Mapped[datetime] = mapped_column(
        server_default=func.now(),
    )
    updated_at: Mapped[datetime] = mapped_column(
        server_default=func.now(),
        onupdate=func.now(),
    )