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 Rack(Base, TimestampMixin):
    __tablename__ = "racks"

    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)
    location: Mapped[Optional[str]] = mapped_column(String(200), nullable=True)

    zone_id: Mapped[Optional[int]] = mapped_column(
        Integer,
        ForeignKey("zones.id", ondelete="SET NULL"),
        nullable=True,
        index=True,
    )

    object: Mapped["Object"] = relationship("Object", back_populates="racks")
    zone: Mapped[Optional["Zone"]] = relationship("Zone", back_populates="racks")
    devices: Mapped[list["Device"]] = relationship("Device", back_populates="rack")