from sqlalchemy import Column, Float, ForeignKey, Integer, String, Text
from sqlalchemy.orm import relationship

from app.db.base import Base


class Item(Base):
    """
    Inventory item model for tracking products and stock.
    """
    __tablename__ = "items"

    id = Column(Integer, 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=True)
    barcode = Column(String, unique=True, index=True, nullable=True)
    quantity = Column(Integer, default=0, nullable=False)
    unit_price = Column(Float, nullable=False)
    reorder_level = Column(Integer, default=10, nullable=False)
    category_id = Column(Integer, ForeignKey("categories.id"), nullable=True)
    supplier_id = Column(Integer, ForeignKey("suppliers.id"), nullable=True)
    
    # Relationships
    category = relationship("Category", back_populates="items")
    supplier = relationship("Supplier", back_populates="items")
    transactions = relationship("Transaction", back_populates="item")