# encoding: utf-8
"""
ms.py

Created by Thomas Mangin on 2012-07-17.
Copyright (c) 2009-2017 Exa Networks. All rights reserved.
License: 3-clause BSD. (See the COPYRIGHT file)
"""

from exabgp.bgp.message.open.capability.capability import Capability

# ================================================================= MultiSession
#


@Capability.register()
@Capability.register(Capability.CODE.MULTISESSION_CISCO)
class MultiSession(Capability, list):
    ID = Capability.CODE.MULTISESSION

    def set(self, data):
        self.extend(data)
        return self

    # XXX: FIXME: Looks like we could do with something in this Caoability
    def __str__(self):
        info = ' (RFC)' if self.ID == Capability.CODE.MULTISESSION else ''
        return 'Multisession%s %s' % (info, ' '.join([str(capa) for capa in self]))

    def json(self):
        variant = 'RFC' if self.ID == Capability.CODE.MULTISESSION else 'Cisco'
        return '{ "name": "multisession", "variant": "%s", "capabilities": [%s ] }' % (
            variant,
            ','.join(' "%s"' % str(capa) for capa in self),
        )

    def extract(self):
        # can probably be written better
        rs = [
            bytes([0]),
        ]
        for v in self:
            rs.append(bytes([v]))
        return rs

    @staticmethod
    def unpack_capability(instance, data, capability=None):  # pylint: disable=W0613
        # XXX: FIXME: we should set that that instance was seen and raise if seen twice
        return instance
