import uuid
from datetime import datetime
from typing import TYPE_CHECKING

from sqlalchemy import DateTime, ForeignKey, String, Text, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base

if TYPE_CHECKING:
    from app.models.object import InventoryObject


class Box(Base):
    __tablename__ = "boxes"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    parent_box_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("boxes.id", ondelete="RESTRICT"), nullable=True, index=True
    )
    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()
    )

    parent: Mapped["Box | None"] = relationship(remote_side=[id], back_populates="children")
    children: Mapped[list["Box"]] = relationship(back_populates="parent")
    objects: Mapped[list["InventoryObject"]] = relationship(back_populates="box")