#
# 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 UDP NIOs.
"""

import asyncio
import uuid

from gns3server.compute.nios import nio_udp
from .nio import NIO


import logging

log = logging.getLogger(__name__)


class NIOUDP(NIO):

    """
    Dynamips UDP NIO.

    :param hypervisor: Dynamips hypervisor instance
    :param lport: local port number
    :param rhost: remote address/host
    :param rport: remote port number
    """

    def __init__(self, node, lport, rhost, rport):

        # create an unique name
        name = f"udp-{uuid.uuid4()}"
        self._lport = lport
        self._rhost = rhost
        self._rport = rport
        self._local_tunnel_lport = None
        self._local_tunnel_rport = None
        self._node = node
        super().__init__(name, node.hypervisor)

    async def create(self):
        if not self._hypervisor:
            return
        # Ubridge is not supported
        if not hasattr(self._node, "add_ubridge_udp_connection"):
            await self._hypervisor.send(
                "nio create_udp {name} {lport} {rhost} {rport}".format(
                    name=self._name, lport=self._lport, rhost=self._rhost, rport=self._rport
                )
            )
            return
        self._local_tunnel_lport = self._node.manager.port_manager.get_free_udp_port(self._node.project)
        self._local_tunnel_rport = self._node.manager.port_manager.get_free_udp_port(self._node.project)
        self._bridge_name = f"DYNAMIPS-{self._local_tunnel_lport}-{self._local_tunnel_rport}"
        await self._hypervisor.send(
            "nio create_udp {name} {lport} {rhost} {rport}".format(
                name=self._name, lport=self._local_tunnel_lport, rhost="127.0.0.1", rport=self._local_tunnel_rport
            )
        )

        log.info(
            "NIO UDP {name} created with lport={lport}, rhost={rhost}, rport={rport}".format(
                name=self._name, lport=self._lport, rhost=self._rhost, rport=self._rport
            )
        )

        self._source_nio = nio_udp.NIOUDP(self._local_tunnel_rport, "127.0.0.1", self._local_tunnel_lport)
        self._destination_nio = nio_udp.NIOUDP(self._lport, self._rhost, self._rport)
        self._destination_nio.filters = self._filters
        await self._node.add_ubridge_udp_connection(self._bridge_name, self._source_nio, self._destination_nio)

    async def update(self):
        self._destination_nio.filters = self._filters
        await self._node.update_ubridge_udp_connection(self._bridge_name, self._source_nio, self._destination_nio)

    async def close(self):
        if self._local_tunnel_lport:
            await self._node.ubridge_delete_bridge(self._bridge_name)
            self._node.manager.port_manager.release_udp_port(self._local_tunnel_lport, self._node.project)
        if self._local_tunnel_rport:
            self._node.manager.port_manager.release_udp_port(self._local_tunnel_rport, self._node.project)
        self._node.manager.port_manager.release_udp_port(self._lport, self._node.project)

    @property
    def lport(self):
        """
        Returns the local port

        :returns: local port number
        """

        return self._lport

    @property
    def rhost(self):
        """
        Returns the remote host

        :returns: remote address/host
        """

        return self._rhost

    @property
    def rport(self):
        """
        Returns the remote port

        :returns: remote port number
        """

        return self._rport

    def __json__(self):

        return {
            "type": "nio_udp",
            "lport": self._lport,
            "rport": self._rport,
            "rhost": self._rhost
        }