from sqlalchemy import Column, Integer, String, DateTime, Text, Float, ForeignKey, Enum
from sqlalchemy.orm import relationship
from datetime import datetime
from app.db.base import Base
import enum


class TransactionType(enum.Enum):
    IN = "in"
    OUT = "out"
    ADJUSTMENT = "adjustment"


class StockTransaction(Base):
    __tablename__ = "stock_transactions"

    id = Column(Integer, primary_key=True, index=True)
    item_id = Column(Integer, ForeignKey("items.id"), nullable=False)
    transaction_type = Column(Enum(TransactionType), nullable=False)
    quantity = Column(Integer, nullable=False)
    unit_cost = Column(Float)
    reference_number = Column(String)
    notes = Column(Text)
    created_at = Column(DateTime, default=datetime.utcnow)

    item = relationship("Item", back_populates="transactions")