# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# Copyright 2012 Cisco Systems, Inc.  All rights reserved.
#
#    Licensed 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.
#
# @author: Sumit Naiksatam, Cisco Systems, Inc.

import logging as LOG

from oslo.config import cfg

from quantum.plugins.cisco.common import config
from quantum.plugins.cisco.common import cisco_constants as const
from quantum.plugins.cisco.common import cisco_exceptions as cexc
from quantum.plugins.cisco.db import network_db_v2 as cdb


LOG.basicConfig(level=LOG.WARN)
LOG.getLogger(const.LOGGER_COMPONENT_NAME)

TENANT = const.NETWORK_ADMIN

_nexus_dict = config.get_nexus_dictionary()


class Store(object):
    """Credential Store"""

    @staticmethod
    def initialize():
        for keys in _nexus_dict.keys():
            if keys[1] == const.USERNAME:
                try:
                    cdb.add_credential(TENANT, keys[0],
                                       _nexus_dict[keys[0], const.USERNAME],
                                       _nexus_dict[keys[0], const.PASSWORD])
                except cexc.CredentialAlreadyExists:
                    # We are quietly ignoring this, since it only happens
                    # if this class module is loaded more than once, in which
                    # case, the credentials are already populated
                    pass

    @staticmethod
    def put_credential(cred_name, username, password):
        """Set the username and password"""
        credential = cdb.add_credential(TENANT, cred_name, username, password)

    @staticmethod
    def get_username(cred_name):
        """Get the username"""
        credential = cdb.get_credential_name(TENANT, cred_name)
        return credential[const.CREDENTIAL_USERNAME]

    @staticmethod
    def get_password(cred_name):
        """Get the password"""
        credential = cdb.get_credential_name(TENANT, cred_name)
        return credential[const.CREDENTIAL_PASSWORD]

    @staticmethod
    def get_credential(cred_name):
        """Get the username and password"""
        credential = cdb.get_credential_name(TENANT, cred_name)
        return {const.USERNAME: const.CREDENTIAL_USERNAME,
                const.PASSWORD: const.CREDENTIAL_PASSWORD}

    @staticmethod
    def delete_credential(cred_name):
        """Delete a credential"""
        cdb.remove_credential(TENANT, cred_name)