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from abc import ABC, abstractmethod
from typing import Generic, TypeVar

from gravitino.api.rel.types.type import Type

_StatisticValueT = TypeVar("_StatisticValueT")


class StatisticValue(Generic[_StatisticValueT], ABC):
    """An interface representing a statistic value.

    Type Parameters:
        The type of the statistic value.
    """

    @abstractmethod
    def value(self) -> _StatisticValueT:
        """Returns the value of the statistic.

        Returns:
            The value of the statistic
        """

    @abstractmethod
    def data_type(self) -> Type:
        """Returns the data type of the statistic value.

        Returns:
            Type: the data type of the statistic value
        """
