"""
Spacewalk Runner
================

.. versionadded:: 2016.3.0

Runner to interact with Spacewalk using Spacewalk API

:codeauthor: Nitin Madhok <nmadhok@g.clemson.edu>, Joachim Werner <joe@suse.com>, Benedikt Werner <1benediktwerner@gmail.com>
:maintainer: Benedikt Werner <1benediktwerner@gmail.com>

To use this runner, set up the Spacewalk URL, username and password in the
master configuration at ``/etc/salt/master`` or ``/etc/salt/master.d/spacewalk.conf``:

.. code-block:: yaml

    spacewalk:
      spacewalk01.domain.com:
        username: 'testuser'
        password: 'verybadpass'
      spacewalk02.domain.com:
        username: 'testuser'
        password: 'verybadpass'

.. note::

    Optionally, ``protocol`` can be specified if the spacewalk server is
    not using the defaults. Default is ``protocol: https``.

"""

import atexit
import logging

from salt.ext import six

log = logging.getLogger(__name__)

_sessions = {}


def __virtual__():
    """
    Check for spacewalk configuration in master config file
    or directory and load runner only if it is specified
    """
    if not _get_spacewalk_configuration():
        return False, "No spacewalk configuration found"
    return True


def _get_spacewalk_configuration(spacewalk_url=""):
    """
    Return the configuration read from the master configuration
    file or directory
    """
    spacewalk_config = __opts__["spacewalk"] if "spacewalk" in __opts__ else None

    if spacewalk_config:
        try:
            for spacewalk_server, service_config in spacewalk_config.items():
                username = service_config.get("username", None)
                password = service_config.get("password", None)
                protocol = service_config.get("protocol", "https")

                if not username or not password:
                    log.error(
                        "Username or Password has not been specified in the master "
                        "configuration for %s",
                        spacewalk_server,
                    )
                    return False

                ret = {
                    "api_url": "{}://{}/rpc/api".format(protocol, spacewalk_server),
                    "username": username,
                    "password": password,
                }

                if (not spacewalk_url) or (spacewalk_url == spacewalk_server):
                    return ret
        except Exception as exc:  # pylint: disable=broad-except
            log.error("Exception encountered: %s", exc)
            return False

        if spacewalk_url:
            log.error(
                "Configuration for %s has not been specified in the master "
                "configuration",
                spacewalk_url,
            )
            return False

    return False


def _get_client_and_key(url, user, password, verbose=0):
    """
    Return the client object and session key for the client
    """
    session = {}
    session["client"] = six.moves.xmlrpc_client.Server(
        url, verbose=verbose, use_datetime=True
    )
    session["key"] = session["client"].auth.login(user, password)

    return session


def _disconnect_session(session):
    """
    Disconnect API connection
    """
    session["client"].auth.logout(session["key"])


def _get_session(server):
    """
    Get session and key
    """
    if server in _sessions:
        return _sessions[server]

    config = _get_spacewalk_configuration(server)
    if not config:
        raise Exception("No config for '{}' found on master".format(server))

    session = _get_client_and_key(
        config["api_url"], config["username"], config["password"]
    )
    atexit.register(_disconnect_session, session)

    client = session["client"]
    key = session["key"]
    _sessions[server] = (client, key)

    return client, key


def api(server, command, *args, **kwargs):
    """
    Call the Spacewalk xmlrpc api.

    CLI Example:

    .. code-block:: bash

        salt-run spacewalk.api spacewalk01.domain.com systemgroup.create MyGroup Description
        salt-run spacewalk.api spacewalk01.domain.com systemgroup.create arguments='["MyGroup", "Description"]'

    State Example:

    .. code-block:: yaml

        create_group:
          salt.runner:
            - name: spacewalk.api
            - server: spacewalk01.domain.com
            - command: systemgroup.create
            - arguments:
              - MyGroup
              - Description
    """
    if "arguments" in kwargs:
        arguments = kwargs["arguments"]
    else:
        arguments = args

    call = "{} {}".format(command, arguments)
    try:
        client, key = _get_session(server)
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = "Exception raised when connecting to spacewalk server ({}): {}".format(
            server, exc
        )
        log.error(err_msg)
        return {call: err_msg}

    namespace, _, method = command.rpartition(".")
    if not namespace:
        return {
            call: "Error: command must use the following format: 'namespace.method'"
        }
    endpoint = getattr(getattr(client, namespace), method)

    try:
        output = endpoint(key, *arguments)
    except Exception as e:  # pylint: disable=broad-except
        output = "API call failed: {}".format(e)

    return {call: output}


def addGroupsToKey(server, activation_key, groups):
    """
    Add server groups to a activation key

    CLI Example:

    .. code-block:: bash

        salt-run spacewalk.addGroupsToKey spacewalk01.domain.com 1-my-key '[group1, group2]'
    """

    try:
        client, key = _get_session(server)
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = "Exception raised when connecting to spacewalk server ({}): {}".format(
            server, exc
        )
        log.error(err_msg)
        return {"Error": err_msg}

    all_groups = client.systemgroup.listAllGroups(key)
    groupIds = []
    for group in all_groups:
        if group["name"] in groups:
            groupIds.append(group["id"])

    if client.activationkey.addServerGroups(key, activation_key, groupIds) == 1:
        return {activation_key: groups}
    else:
        return {activation_key: "Failed to add groups to activation key"}


def deleteAllGroups(server):
    """
    Delete all server groups from Spacewalk
    """

    try:
        client, key = _get_session(server)
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = "Exception raised when connecting to spacewalk server ({}): {}".format(
            server, exc
        )
        log.error(err_msg)
        return {"Error": err_msg}

    groups = client.systemgroup.listAllGroups(key)

    deleted_groups = []
    failed_groups = []

    for group in groups:
        if client.systemgroup.delete(key, group["name"]) == 1:
            deleted_groups.append(group["name"])
        else:
            failed_groups.append(group["name"])

    ret = {"deleted": deleted_groups}
    if failed_groups:
        ret["failed"] = failed_groups
    return ret


def deleteAllSystems(server):
    """
    Delete all systems from Spacewalk

    CLI Example:

    .. code-block:: bash

        salt-run spacewalk.deleteAllSystems spacewalk01.domain.com
    """

    try:
        client, key = _get_session(server)
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = "Exception raised when connecting to spacewalk server ({}): {}".format(
            server, exc
        )
        log.error(err_msg)
        return {"Error": err_msg}

    systems = client.system.listSystems(key)

    ids = []
    names = []
    for system in systems:
        ids.append(system["id"])
        names.append(system["name"])

    if client.system.deleteSystems(key, ids) == 1:
        return {"deleted": names}
    else:
        return {"Error": "Failed to delete all systems"}


def deleteAllActivationKeys(server):
    """
    Delete all activation keys from Spacewalk

    CLI Example:

    .. code-block:: bash

        salt-run spacewalk.deleteAllActivationKeys spacewalk01.domain.com
    """

    try:
        client, key = _get_session(server)
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = "Exception raised when connecting to spacewalk server ({}): {}".format(
            server, exc
        )
        log.error(err_msg)
        return {"Error": err_msg}

    activation_keys = client.activationkey.listActivationKeys(key)

    deleted_keys = []
    failed_keys = []

    for aKey in activation_keys:
        if client.activationkey.delete(key, aKey["key"]) == 1:
            deleted_keys.append(aKey["key"])
        else:
            failed_keys.append(aKey["key"])

    ret = {"deleted": deleted_keys}
    if failed_keys:
        ret["failed"] = failed_keys
    return ret


def unregister(name, server_url):
    """
    Unregister specified server from Spacewalk

    CLI Example:

    .. code-block:: bash

        salt-run spacewalk.unregister my-test-vm spacewalk01.domain.com
    """

    try:
        client, key = _get_session(server_url)
    except Exception as exc:  # pylint: disable=broad-except
        err_msg = "Exception raised when connecting to spacewalk server ({}): {}".format(
            server_url, exc
        )
        log.error(err_msg)
        return {name: err_msg}

    systems_list = client.system.getId(key, name)

    if systems_list:
        for system in systems_list:
            out = client.system.deleteSystem(key, system["id"])
            if out == 1:
                return {name: "Successfully unregistered from {}".format(server_url)}
            else:
                return {name: "Failed to unregister from {}".format(server_url)}
    else:
        return {
            name: "System does not exist in spacewalk server ({})".format(server_url)
        }
