from scapy.layers.l2 import Dot1Q
from abc import abstractmethod, ABCMeta
from vpp_pg_interface import VppPGInterface
from vpp_papi_provider import L2_VTR_OP
from vpp_interface import VppInterface


class VppSubInterface(VppPGInterface):
    __metaclass__ = ABCMeta

    @property
    def parent(self):
        """Parent interface for this sub-interface"""
        return self._parent

    @property
    def sub_id(self):
        """Sub-interface ID"""
        return self._sub_id

    @property
    def tag1(self):
        return self._tag1

    @property
    def tag2(self):
        return self._tag2

    @property
    def vtr(self):
        return self._vtr

    def __init__(self, test, parent, sub_id):
        VppInterface.__init__(self, test)
        self._parent = parent
        self._parent.add_sub_if(self)
        self._sub_id = sub_id
        self.DOT1AD_TYPE = 0x88A8
        self.DOT1Q_TYPE = 0x8100

    def set_sw_if_index(self, sw_if_index):
        super(VppSubInterface, self).set_sw_if_index(sw_if_index)
        self.set_vtr(L2_VTR_OP.L2_DISABLED)

    @abstractmethod
    def create_arp_req(self):
        pass

    @abstractmethod
    def create_ndp_req(self):
        pass

    def resolve_arp(self):
        super(VppSubInterface, self).resolve_arp(self.parent)

    def resolve_ndp(self):
        super(VppSubInterface, self).resolve_ndp(self.parent)

    @abstractmethod
    def add_dot1_layer(self, pkt):
        pass

    def remove_vpp_config(self):
        self.test.vapi.delete_subif(self.sw_if_index)

    def _add_tag(self, packet, vlan, tag_type):
        payload = packet.payload
        inner_type = packet.type
        packet.remove_payload()
        packet.add_payload(Dot1Q(vlan=vlan) / payload)
        packet.payload.type = inner_type
        packet.payload.vlan = vlan
        packet.type = tag_type
        return packet

    def _remove_tag(self, packet, vlan=None, tag_type=None):
        if tag_type:
            self.test.instance().assertEqual(packet.type, tag_type)

        payload = packet.payload
        if vlan:
            self.test.instance().assertEqual(payload.vlan, vlan)
        inner_type = payload.type
        payload = payload.payload
        packet.remove_payload()
        packet.add_payload(payload)
        packet.type = inner_type
        return packet

    def add_dot1q_layer(self, packet, vlan):
        return self._add_tag(packet, vlan, self.DOT1Q_TYPE)

    def add_dot1ad_layer(self, packet, outer, inner):
        p = self._add_tag(packet, inner, self.DOT1Q_TYPE)
        return self._add_tag(p, outer, self.DOT1AD_TYPE)

    def remove_dot1q_layer(self, packet, vlan=None):
        return self._remove_tag(packet, vlan, self.DOT1Q_TYPE)

    def remove_dot1ad_layer(self, packet, outer=None, inner=None):
        p = self._remove_tag(packet, outer, self.DOT1AD_TYPE)
        return self._remove_tag(p, inner, self.DOT1Q_TYPE)

    def set_vtr(self, vtr, push1q=0, tag=None, inner=None, outer=None):
        self._tag1 = 0
        self._tag2 = 0
        self._push1q = 0

        if (vtr == L2_VTR_OP.L2_PUSH_1 or
            vtr == L2_VTR_OP.L2_TRANSLATE_1_1 or
                vtr == L2_VTR_OP.L2_TRANSLATE_2_1):
            self._tag1 = tag
            self._push1q = push1q
        if (vtr == L2_VTR_OP.L2_PUSH_2 or
            vtr == L2_VTR_OP.L2_TRANSLATE_1_2 or
                vtr == L2_VTR_OP.L2_TRANSLATE_2_2):
            self._tag1 = outer
            self._tag2 = inner
            self.<