import typing
import collections.abc

from .product import product
from .exception import not_ready_exception

class product_response:
    def __new__(
        cls, 
        target: product | typing.Iterable[product]
    ) -> list | dict:
        if isinstance(target, product):
            return cls.single(target)

        if isinstance(target, collections.abc.Iterable):
            return cls.collection(target)

        raise TypeError("Bad type for product response generator.")


    def single(target: product) -> dict:
        if not product.ready:
            raise not_ready_exception(target)

        return {
            "name": product.name,
            "description": product.description,
            "author": product.author,
            "image": product.image,
            "stock_count": product.stock_count,
            "barcode": product.barcode
        }

    def collection(targets: typing.Iterable[product]) -> list:
        result = list()

        for count in targets:
            if not isinstance(count, product):
                raise TypeError("Products iterable must contain products.")

            result.append(product_response.single(count))

        return result