# python
from dataclasses import dataclass
from models.base import BaseModel

@dataclass
class Reward(BaseModel):
    name: str
    description: str
    cost: int
    image_id: str | None = None

    @classmethod
    def from_dict(cls, d: dict):
        # Base fields are keyword-only; can be overridden if provided
        return cls(
            name=d.get('name'),
            description=d.get('description'),
            cost=d.get('cost', 0),
            image_id=d.get('image_id'),
            id=d.get('id'),
            created_at=d.get('created_at'),
            updated_at=d.get('updated_at')
        )

    def to_dict(self):
        base = super().to_dict()
        base.update({
            'name': self.name,
            'description': self.description,
            'cost': self.cost,
            'image_id': self.image_id
        })
        return base