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"""This module contains Azure Data Explorer operators"""
from typing import TYPE_CHECKING, Optional, Sequence, Union

from azure.kusto.data._models import KustoResultTable

from airflow.configuration import conf
from airflow.models import BaseOperator
from airflow.providers.microsoft.azure.hooks.adx import AzureDataExplorerHook

if TYPE_CHECKING:
    from airflow.utils.context import Context


class AzureDataExplorerQueryOperator(BaseOperator):
    """
    Operator for querying Azure Data Explorer (Kusto).

    :param query: KQL query to run (templated).
    :param database: Database to run the query on (templated).
    :param options: Optional query options. See:
      https://docs.microsoft.com/en-us/azure/kusto/api/netfx/request-properties#list-of-clientrequestproperties
    :param azure_data_explorer_conn_id: Reference to the
        :ref:`Azure Data Explorer connection<howto/connection:adx>`.
    """

    ui_color = '#00a1f2'
    template_fields: Sequence[str] = ('query', 'database')
    template_ext: Sequence[str] = ('.kql',)

    def __init__(
        self,
        *,
        query: str,
        database: str,
        options: Optional[dict] = None,
        azure_data_explorer_conn_id: str = 'azure_data_explorer_default',
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        self.query = query
        self.database = database
        self.options = options
        self.azure_data_explorer_conn_id = azure_data_explorer_conn_id

    def get_hook(self) -> AzureDataExplorerHook:
        """Returns new instance of AzureDataExplorerHook"""
        return AzureDataExplorerHook(self.azure_data_explorer_conn_id)

    def execute(self, context: "Context") -> Union[KustoResultTable, str]:
        """
        Run KQL Query on Azure Data Explorer (Kusto).
        Returns `PrimaryResult` of Query v2 HTTP response contents
        (https://docs.microsoft.com/en-us/azure/kusto/api/rest/response2)
        """
        hook = self.get_hook()
        response = hook.run_query(self.query, self.database, self.options)
        if conf.getboolean('core', 'enable_xcom_pickling'):
            return response.primary_results[0]
        else:
            return str(response.primary_results[0])