from sqlalchemy import Column, Integer, String, ForeignKey, DateTime
from sqlalchemy.orm import relationship
from datetime import datetime

from app.database import Base


class Category(Base):
    __tablename__ = "categories"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String(100), nullable=False)
    parent_id = Column(Integer, ForeignKey("categories.id"))
    level = Column(Integer, nullable=False, default=1)
    icon = Column(String(50))
    sort_order = Column(Integer, default=0)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    parent = relationship("Category", remote_side=[id])
    children = relationship("Category", back_populates="parent")
    medicines = relationship("Medicine", back_populates="category")