from sqlalchemy import Column, Integer, String, DateTime, text
from sqlalchemy.orm import relationship
from database import Base

class Category(Base):
    __tablename__ = "categories"

    id = Column(Integer, primary_key=True, index=True, comment='主键 ID')
    parent_code = Column(String(100), nullable=False, server_default="", index=True, comment='父分类编码，空为顶级分类')
    code = Column(String(100), nullable=False, server_default="", index=True, comment='分类编码，级联编码格式')
    name = Column(String(100), nullable=False, server_default="", index=True, comment='分类名称')
    sort_order = Column(Integer, nullable=False, server_default="0", comment='排序顺序')
    status = Column(Integer, nullable=False, server_default="1", comment='状态：0-禁用，1-启用')
    company_code = Column(String(50), nullable=False, server_default="", index=True, comment='公司编码，用于数据隔离')
    created_at = Column(DateTime(timezone=True), nullable=False, server_default=text('CURRENT_TIMESTAMP'), comment='创建时间')
    updated_at = Column(DateTime(timezone=True), nullable=False, server_default=text('CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP'), comment='更新时间')

    # 关系
    products = relationship("Product", back_populates="category")