from sqlalchemy import Column, String, Integer, Float, DateTime, Text, ForeignKey, Boolean
from sqlalchemy.sql import func
from sqlalchemy.orm import relationship

from app.db.base_class import Base


class Product(Base):
    id = Column(String, primary_key=True, index=True)
    name = Column(String, index=True, nullable=False)
    description = Column(Text, nullable=True)
    sku = Column(String, unique=True, index=True, nullable=False)
    barcode = Column(String, unique=True, nullable=True)
    
    category_id = Column(String, ForeignKey("category.id"), nullable=True)
    category = relationship("Category", backref="products")
    
    supplier_id = Column(String, ForeignKey("supplier.id"), nullable=True)
    supplier = relationship("Supplier", backref="products")
    
    cost_price = Column(Float, nullable=False, default=0.0)
    selling_price = Column(Float, nullable=False, default=0.0)
    
    current_stock = Column(Integer, nullable=False, default=0)
    reorder_level = Column(Integer, nullable=False, default=0)
    
    is_active = Column(Boolean, default=True)
    
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())