# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# Copyright 2011 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: Edgar Magana, Cisco Systems
"""
Logistic components for Service Insertion utility
"""

import logging
import re
import subprocess
import time

from quantum.common import utils
from quantum.openstack.common import importutils
from quantum.plugins.cisco.common import cisco_constants as const
from quantum.plugins.cisco.db import services_db as sdb
from quantum.plugins.cisco import l2network_plugin_configuration as conf
from quantum.plugins.cisco.services import services_constants as servconts


LOG = logging.getLogger(__name__)


class ServicesLogistics():
    """
    Services Logistics Modules
    """
    def __init__(self):
        pass

    def image_shutdown_verification(self, image_name):
        """
        Verifies that the VM has been properly shutdown
        """
        try:
            service_args = []
            service_args.append(servconts.DESCRIBE_VM_CMD)
            service_args.append(image_name)
            counter = 0
            flag = False
            while not flag and counter <= 5:
                counter = counter + 1
                time.sleep(2.5)
                process = utils.subprocess_popen(service_args,
                                                 stdout=subprocess.PIPE)
                result = process.stdout.readlines()
                if not result:
                    flag = True
        except Exception, exc:
            print exc

    def image_status(self, image_name):
        """
        Checks the status of the image
        """
        try:
            service_args = []
            service_args.append(servconts.DESCRIBE_VM_CMD)
            service_args.append(image_name)
            counter = 0
            flag = False
            while not flag and counter <= 10:
                counter = counter + 1
                time.sleep(2.5)
                process = utils.subprocess_popen(service_args,
                                                 stdout=subprocess.PIPE)
                result = process.stdout.readlines()
                if result:
                    tokens = re.search("running", str(result[1]))
                    if tokens:
                        service_status = tokens.group(0)
                        if service_status == "running":
                            flag = True
        except Exception as exc:
            print exc

    def image_exist(self, image_name):
        """
        Verifies that the image id is available
        """
        try:
            service_vm = sdb.get_service_bindings(image_name)
            if service_vm:
                return True
            else:
                return False
        except Exception as exc:
            print exc

    def verify_plugin(self, plugin_key):
        """
        Verifies the PlugIn available
        """
        _plugins = {}
        for key in conf.PLUGINS[const.PLUGINS].keys():
            plugin_obj = conf.PLUGINS[const.PLUGINS][key]
            _plugins[key] = importutils.import_object(plugin_obj)
        if not plugin_key in _plugins.keys():
            LOG.debug("No %s Plugin loaded" % plugin_key)
            return False
        else:
            LOG.debug("Plugin %s founded" % const.UCS_PLUGIN)
            return True

    def press_key(self):
        """
        Waits for en external input
        """
        key = raw_input("Press any key to continue")
        return key