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

from app.database import Base


class AuditLog(Base):
    __tablename__ = "audit_logs"

    id = Column(Integer, primary_key=True, index=True)
    medicine_id = Column(Integer, ForeignKey("medicines.id"), nullable=False, index=True)
    batch_id = Column(Integer, ForeignKey("batches.id"))
    user_id = Column(Integer, ForeignKey("users.id"))
    action = Column(String(50), nullable=False)
    quantity_change = Column(Integer, nullable=False)
    quantity_after = Column(Integer, nullable=False)
    remark = Column(Text)
    created_at = Column(DateTime, default=datetime.utcnow)

    medicine = relationship("Medicine", back_populates="audit_logs")
    batch = relationship("Batch", back_populates="audit_logs")
    user = relationship("User", back_populates="audit_logs")