"""Declarative base + shared mixins for every ORM model."""
from __future__ import annotations

import uuid
from datetime import datetime

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


class Base(DeclarativeBase):
    pass


def uuid_pk() -> Mapped[str]:
    return mapped_column(primary_key=True, default=lambda: str(uuid.uuid4()))


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