# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
Interface for VDE (Virtual Distributed Ethernet) NIOs (Unix based OSes only).
"""

from .nio import NIO

import logging
log = logging.getLogger(__name__)


class NIO_VDE(NIO):
    """
    Dynamips VDE NIO.

    :param hypervisor: Dynamips hypervisor object
    :param control_file: VDE control filename
    :param local_file: VDE local filename
    """

    _instance_count = 0

    def __init__(self, hypervisor, control_file, local_file):

        NIO.__init__(self, hypervisor)

        # create an unique ID
        self._id = NIO_VDE._instance_count
        NIO_VDE._instance_count += 1
        self._name = 'nio_vde' + str(self._id)
        self._control_file = control_file
        self._local_file = local_file

        self._hypervisor.send("nio create_vde {name} {control} {local}".format(name=self._name,
                                                                               control=control_file,
                                                                               local=local_file))

        log.info("NIO VDE {name} created with control={control}, local={local}".format(name=self._name,
                                                                                       control=control_file,
                                                                                       local=local_file))

    @classmethod
    def reset(cls):
        """
        Reset the instance count.
        """

        cls._instance_count = 0

    @property
    def control_file(self):
        """
        Returns the VDE control file.

        :returns: VDE control filename
        """

        return self._control_file

    @property
    def local_file(self):
        """
        Returns the VDE local file.

        :returns: VDE local filename
        """

        return self._local_file