from __future__ import annotations

import uuid
from datetime import UTC, datetime

from sqlalchemy import DateTime, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base


class TimestampMixin:
    """Mixin providing created_at and updated_at timestamps."""

    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        server_default=func.now(),
        nullable=False,
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        server_default=func.now(),
        onupdate=lambda: datetime.now(UTC),
        nullable=False,
    )


class UUIDPrimaryKeyMixin:
    """Mixin providing a UUID primary key."""

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
        nullable=False,
    )