from typing import Optional

from sqlalchemy import ForeignKey, Integer, String, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship

from .base import Base, TimestampMixin


class Zone(Base, TimestampMixin):
    __tablename__ = "zones"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    object_id: Mapped[int] = mapped_column(
        Integer,
        ForeignKey("objects.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)

    object: Mapped["Object"] = relationship("Object", back_populates="zones")
    racks: Mapped[list["Rack"]] = relationship("Rack", back_populates="zone")