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from __future__ import annotations

from abc import ABCMeta, abstractmethod
from typing import TYPE_CHECKING, ClassVar

import attr

if TYPE_CHECKING:
    from airflow.models.baseoperator import BaseOperator
    from airflow.models.taskinstancekey import TaskInstanceKey


@attr.s(auto_attribs=True)
class BaseOperatorLink(metaclass=ABCMeta):
    """Abstract base class that defines how we get an operator link."""

    operators: ClassVar[list[type[BaseOperator]]] = []
    """
    This property will be used by Airflow Plugins to find the Operators to which you want
    to assign this Operator Link

    :return: List of Operator classes used by task for which you want to create extra link
    """

    @property
    @abstractmethod
    def name(self) -> str:
        """Name of the link. This will be the button name on the task UI."""

    @abstractmethod
    def get_link(self, operator: BaseOperator, *, ti_key: TaskInstanceKey) -> str:
        """
        Link to external system.

        Note: The old signature of this function was ``(self, operator, dttm: datetime)``. That is still
        supported at runtime but is deprecated.

        :param operator: The Airflow operator object this link is associated to.
        :param ti_key: TaskInstance ID to return link for.
        :return: link to external system
        """