# -*- 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 FIFO NIOs.
"""

from .nio import NIO


class NIO_FIFO(NIO):
    """
    Dynamips FIFO NIO.

    :param hypervisor: Dynamips hypervisor object
    """

    _instance_count = 0

    def __init__(self, hypervisor):

        NIO.__init__(self, hypervisor)

        # create an unique ID
        self._id = NIO_FIFO._instance_count
        NIO_FIFO._instance_count += 1
        self._name = 'nio_fifo' + str(self._id)

        self._hypervisor.send("nio create_fifo {}".format(self._name))

    def crossconnect(self, nio):
        """
        Establishes a cross-connect between this FIFO NIO and another one.

        :param nio: FIFO NIO object.
        """

        self._hypervisor.send("nio crossconnect_fifo {name} {nio}".format(name=self._name,
                                                                          nio=nio))