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from abc import ABC, abstractmethod

from airflow.models import BaseOperator

from liminal.runners.airflow.operators.operator_with_variable_resolving import (
    OperatorWithVariableResolving,
)


def add_variables_to_operator(operator, task) -> BaseOperator:
    """
    :param operator: Airflow operator
    :type operator: BaseOperator
    :param task: Task instance
    :returns: OperatorWithVariableResolving wrapping given operator
    """
    return OperatorWithVariableResolving(
        dag=task.dag,
        task_config=task.task_config,
        variables=task.variables,
        liminal_task_instance=task,
        operator=operator,
    )


class Executor(ABC):
    """
    Executor Task.
    """

    # list of task types supported by the executor
    supported_task_types = []

    def __init__(self, executor_id, liminal_config, executor_config):
        self.liminal_config = liminal_config
        self.executor_id = executor_id
        self.executor_config = executor_config

    def apply_task_to_dag(self, **kwargs):
        task = kwargs['task']

        self._validate_task_type(task)

        return self._apply_executor_task_to_dag(task=task)

    @abstractmethod
    def _apply_executor_task_to_dag(self, **kwargs):
        pass

    def _validate_task_type(self, task):
        assert any(
            [isinstance(task, tYp) for tYp in self.supported_task_types]
        ), f'supported task types: {self.supported_task_types}'