#
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# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations

import logging
from base64 import b64encode
from collections.abc import Sequence
from typing import TYPE_CHECKING

from airflow.configuration import conf
from airflow.exceptions import AirflowException
from airflow.providers.microsoft.winrm.hooks.winrm import WinRMHook
from airflow.providers.microsoft.winrm.version_compat import BaseOperator

if TYPE_CHECKING:
    from airflow.utils.context import Context

# Hide the following error message in urllib3 when making WinRM connections:
# requests.packages.urllib3.exceptions.HeaderParsingError: [StartBoundaryNotFoundDefect(),
#   MultipartInvariantViolationDefect()], unparsed data: ''

logging.getLogger("urllib3.connectionpool").setLevel(logging.ERROR)


class WinRMOperator(BaseOperator):
    """
    WinRMOperator to execute commands on given remote host using the winrm_hook.

    :param winrm_hook: predefined ssh_hook to use for remote execution
    :param ssh_conn_id: connection id from airflow Connections
    :param remote_host: remote host to connect
    :param command: command to execute on remote host. (templated)
    :param ps_path: path to powershell, `powershell` for v5.1- and `pwsh` for v6+.
        If specified, it will execute the command as powershell script.
    :param output_encoding: the encoding used to decode stout and stderr
    :param timeout: timeout for executing the command.
    :param expected_return_code: expected return code value(s) of command.
    """

    template_fields: Sequence[str] = ("command",)
    template_fields_renderers = {"command": "powershell"}

    def __init__(
        self,
        *,
        winrm_hook: WinRMHook | None = None,
        ssh_conn_id: str | None = None,
        remote_host: str | None = None,
        command: str | None = None,
        ps_path: str | None = None,
        output_encoding: str = "utf-8",
        timeout: int = 10,
        expected_return_code: int | list[int] | range = 0,
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        self.winrm_hook = winrm_hook
        self.ssh_conn_id = ssh_conn_id
        self.remote_host = remote_host
        self.command = command
        self.ps_path = ps_path
        self.output_encoding = output_encoding
        self.timeout = timeout
        self.expected_return_code = expected_return_code

    def execute(self, context: Context) -> list | str:
        if self.ssh_conn_id and not self.winrm_hook:
            self.log.info("Hook not found, creating...")
            self.winrm_hook = WinRMHook(ssh_conn_id=self.ssh_conn_id)

        if not self.winrm_hook:
            raise AirflowException("Cannot operate without winrm_hook or ssh_conn_id.")

        if self.remote_host is not None:
            self.winrm_hook.remote_host = self.remote_host

        if not self.command:
            raise AirflowException("No command specified so nothing to execute here.")

        return_code, stdout_buffer, stderr_buffer = self.winrm_hook.run(
            command=self.command,
            ps_path=self.ps_path,
            output_encoding=self.output_encoding,
            return_output=self.do_xcom_push,
        )

        success = False
        if isinstance(self.expected_return_code, int):
            success = return_code == self.expected_return_code
        elif isinstance(self.expected_return_code, list) or isinstance(self.expected_return_code, range):
            success = return_code in self.expected_return_code

        if success:
            # returning output if do_xcom_push is set
            # TODO: Remove this after minimum Airflow version is 3.0
            enable_pickling = conf.getboolean("core", "enable_xcom_pickling", fallback=False)

            if enable_pickling:
                return stdout_buffer
            return b64encode(b"".join(stdout_buffer)).decode(self.output_encoding)

        stderr_output = b"".join(stderr_buffer).decode(self.output_encoding)
        error_msg = f"Error running cmd: {self.command}, return code: {return_code}, error: {stderr_output}"
        raise AirflowException(error_msg)
