import enum

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

from app.db.base import Base


class MovementType(str, enum.Enum):
    STOCK_IN = "STOCK_IN"
    STOCK_OUT = "STOCK_OUT"
    ADJUSTMENT = "ADJUSTMENT"
    RETURN = "RETURN"


class InventoryMovement(Base):
    __tablename__ = "inventory_movements"

    id = Column(String, primary_key=True, index=True)
    product_id = Column(String, ForeignKey("products.id"), nullable=False)
    quantity = Column(Integer, nullable=False)
    type = Column(Enum(MovementType), nullable=False)
    reference = Column(String, nullable=True)
    notes = Column(Text, nullable=True)
    unit_price = Column(Float, nullable=True)
    created_by = Column(String, ForeignKey("users.id"), nullable=True)
    created_at = Column(DateTime(timezone=True), server_default=func.now())

    # Relationships
    product = relationship("Product", back_populates="inventory_movements")