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


class Currency(Base):
    __tablename__ = "currency"

    id = Column(Integer, primary_key=True, index=True)
    code = Column(String(3), nullable=False, unique=True, index=True)
    name = Column(String(128), nullable=False)
    symbol = Column(String(8), nullable=True)
    is_active = Column(Boolean, nullable=False, default=True)

    # reverse relationships (optional)
    capex_items = relationship(
        "Capex", back_populates="currency", lazy="select"
    )
    opex_items = relationship("Opex", back_populates="currency", lazy="select")

    def __repr__(self):
        return (
            f"<Currency code={self.code} name={self.name} symbol={self.symbol}>"
        )