from datetime import datetime

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


class Base(DeclarativeBase):
    pass


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


class SoftDeleteMixin:
    deleted_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True, default=None, index=True
    )