from sqlalchemy import Column, Integer, String, DateTime, func
from sqlalchemy.orm import relationship
from config.database import Base


class Scenario(Base):
    __tablename__ = "scenario"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, unique=True, nullable=False)
    description = Column(String)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
    parameters = relationship("Parameter", back_populates="scenario")
    simulation_results = relationship(
        "SimulationResult", back_populates="scenario")

    # relationships can be defined later
    def __repr__(self):
        return f"<Scenario id={self.id} name={self.name}>"