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"""
NAPALM SNMP
===========

Manages SNMP on network devices.

:codeauthor: Mircea Ulinic <ping@mirceaulinic.net>
:maturity:   new
:depends:    napalm
:platform:   unix

Dependencies
------------
- :mod:`NAPALM proxy minion <salt.proxy.napalm>`
- :mod:`NET basic features <salt.modules.napalm_network>`

.. seealso::
    :mod:`SNMP configuration management state <salt.states.netsnmp>`

.. versionadded:: 2016.11.0
"""

import logging

# import NAPALM utils
import salt.utils.napalm
from salt.utils.napalm import proxy_napalm_wrap

log = logging.getLogger(__file__)


# ----------------------------------------------------------------------------------------------------------------------
# module properties
# ----------------------------------------------------------------------------------------------------------------------

__virtualname__ = "snmp"
__proxyenabled__ = ["napalm"]
# uses NAPALM-based proxy to interact with network devices
__virtual_aliases__ = ("napalm_snmp",)

# ----------------------------------------------------------------------------------------------------------------------
# property functions
# ----------------------------------------------------------------------------------------------------------------------


def __virtual__():
    """
    NAPALM library must be installed for this module to work and run in a (proxy) minion.
    """
    return salt.utils.napalm.virtual(__opts__, __virtualname__, __file__)


# ----------------------------------------------------------------------------------------------------------------------
# helper functions -- will not be exported
# ----------------------------------------------------------------------------------------------------------------------

# ----------------------------------------------------------------------------------------------------------------------
# callable functions
# ----------------------------------------------------------------------------------------------------------------------


@proxy_napalm_wrap
def config(**kwargs):  # pylint: disable=unused-argument
    """
    Returns the SNMP configuration

    CLI Example:

    .. code-block:: bash

        salt '*' snmp.config
    """

    return salt.utils.napalm.call(
        napalm_device,  # pylint: disable=undefined-variable
        "get_snmp_information",
        **{}
    )


@proxy_napalm_wrap
def remove_config(
    chassis_id=None,
    community=None,
    contact=None,
    location=None,
    test=False,
    commit=True,
    **kwargs
):  # pylint: disable=unused-argument
    """
    Removes a configuration element from the SNMP configuration.

    :param chassis_id: (optional) Chassis ID

    :param community: (optional) A dictionary having the following optional keys:

    - acl (if any policy / ACL need to be set)
    - mode: rw or ro. Default: ro

    :param contact: Contact details

    :param location: Location

    :param test: Dry run? If set as True, will apply the config, discard and return the changes. Default: False

    :param commit: Commit? (default: True) Sometimes it is not needed to commit
        the config immediately after loading the changes. E.g.: a state loads a
        couple of parts (add / remove / update) and would not be optimal to
        commit after each operation.  Also, from the CLI when the user needs to
        apply the similar changes before committing, can specify commit=False
        and will not discard the config.

    :raise MergeConfigException: If there is an error on the configuration sent.
    :return: A dictionary having the following keys:

    - result (bool): if the config was applied successfully. It is `False`
      only in case of failure. In case there are no changes to be applied
      and successfully performs all operations it is still `True` and so
      will be the `already_configured` flag (example below)
    - comment (str): a message for the user
    - already_configured (bool): flag to check if there were no changes applied
    - diff (str): returns the config changes applied

    CLI Example:

    .. code-block:: bash

        salt '*' snmp.remove_config community='abcd'
    """

    dic = {"template_name": "delete_snmp_config", "test": test, "commit": commit}

    if chassis_id:
        dic["chassis_id"] = chassis_id
    if community:
        dic["community"] = community
    if contact:
        dic["contact"] = contact
    if location:
        dic["location"] = location
    dic["inherit_napalm_device"] = napalm_device  # pylint: disable=undefined-variable

    return __salt__["net.load_template"](**dic)


@proxy_napalm_wrap
def update_config(
    chassis_id=None,
    community=None,
    contact=None,
    location=None,
    test=False,
    commit=True,
    **kwargs
):  # pylint: disable=unused-argument
    """
    Updates the SNMP configuration.

    :param chassis_id: (optional) Chassis ID
    :param community: (optional) A dictionary having the following optional keys:

    - acl (if any policy / ACL need to be set)
    - mode: rw or ro. Default: ro

    :param contact: Contact details
    :param location: Location
    :param test: Dry run? If set as True, will apply the config, discard and return the changes. Default: False
    :param commit: Commit? (default: True) Sometimes it is not needed to commit the config immediately
        after loading the changes. E.g.: a state loads a couple of parts (add / remove / update)
        and would not be optimal to commit after each operation.
        Also, from the CLI when the user needs to apply the similar changes before committing,
        can specify commit=False and will not discard the config.
    :raise MergeConfigException: If there is an error on the configuration sent.
    :return a dictionary having the following keys:

    - result (bool): if the config was applied successfully. It is `False` only
      in case of failure. In case there are no changes to be applied and
      successfully performs all operations it is still `True` and so will be
      the `already_configured` flag (example below)
    - comment (str): a message for the user
    - already_configured (bool): flag to check if there were no changes applied
    - diff (str): returns the config changes applied

    CLI Example:

    .. code-block:: bash

        salt 'edge01.lon01' snmp.update_config location="Greenwich, UK" test=True

    Output example (for the CLI example above):

    .. code-block:: yaml

        edge01.lon01:
            ----------
            already_configured:
                False
            comment:
                Configuration discarded.
            diff:
                [edit snmp]
                -  location "London, UK";
                +  location "Greenwich, UK";
            result:
                True
    """

    dic = {"template_name": "snmp_config", "test": test, "commit": commit}

    if chassis_id:
        dic["chassis_id"] = chassis_id
    if community:
        dic["community"] = community
    if contact:
        dic["contact"] = contact
    if location:
        dic["location"] = location
    dic["inherit_napalm_device"] = napalm_device  # pylint: disable=undefined-variable

    return __salt__["net.load_template"](**dic)