import uuid
from datetime import datetime

from sqlalchemy import DateTime, String, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


class DocumentCategory(Base):
    __tablename__ = "document_categories"

    id: Mapped[str] = mapped_column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
    user_id: Mapped[str] = mapped_column(String, nullable=False, index=True)
    name: Mapped[str] = mapped_column(String(128), nullable=False)
    scope: Mapped[str] = mapped_column(String(16), nullable=False, default="personal", server_default="personal")
    group_id: Mapped[str | None] = mapped_column(String, nullable=True, index=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )

    assignments: Mapped[list["CategoryAssignment"]] = relationship(
        "CategoryAssignment", back_populates="category", cascade="all, delete-orphan"
    )