#!/usr/bin/env python3

from socket import inet_pton, inet_ntop, AF_INET, AF_INET6
import unittest

from framework import VppTestCase, VppTestRunner
from vpp_ip import DpoProto
from vpp_ip_route import VppIpRoute, VppRoutePath, VppMplsLabel, VppIpTable

from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6

from vpp_object import VppObject

NUM_PKTS = 67


def find_l3xc(test, sw_if_index, dump_sw_if_index=None):
    if not dump_sw_if_index:
        dump_sw_if_index = sw_if_index
    xcs = test.vapi.l3xc_dump(dump_sw_if_index)
    for xc in xcs:
        if sw_if_index == xc.l3xc.sw_if_index:
            return True
    return False


class VppL3xc(VppObject):
    def __init__(self, test, intf, paths, is_ip6=False):
        self._test = test
        self.intf = intf
        self.is_ip6 = is_ip6
        self.paths = paths
        self.encoded_paths = []
        for path in self.paths:
            self.encoded_paths.append(path.encode())

    def add_vpp_config(self):
        self._test.vapi.l3xc_update(
            l3xc={
                "is_ip6": self.is_ip6,
                "sw_if_index": self.intf.sw_if_index,
                "n_paths": len(self.paths),
                "paths": self.encoded_paths,
            }
        )
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.l3xc_del(is_ip6=self.is_ip6, sw_if_index=self.intf.sw_if_index)

    def query_vpp_config(self):
        return find_l3xc(self._test, self.intf.sw_if_index)

    def object_id(self):
        return "l3xc-%d" % self.intf.sw_if_index


class TestL3xc(VppTestCase):
    """L3XC Test Case"""

    @classmethod
    def setUpClass(cls):
        super(TestL3xc, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestL3xc, cls).tearDownClass()

    def setUp(self):
        super(TestL3xc, self).setUp()

        self.create_pg_interfaces(range(6))

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip4()
            i.resolve_arp()
            i.config_ip6()
            i.resolve_ndp()

    def tearDown(self):
        for i in self.pg_interfaces:
            i.unconfig_ip4()
            i.unconfig_ip6()
            i.admin_down()
        super(TestL3xc, self).tearDown()

    def test_l3xc4(self):
        """IPv4 X-Connect"""

        #
        # x-connect pg0 to pg1 and pg2 to pg3->5
        #
        l3xc_1 = VppL3xc(
            self, self.pg0, [VppRoutePath(self.pg1.remote_ip4, self.pg1.sw_if_index)]
        )
        l3xc_1.add_vpp_config()
        l3xc_2 = VppL3xc(
            self,
            self.pg2,
            [
                VppRoutePath(self.pg3.remote_ip4, self.pg3.sw_if_index),
                VppRoutePath(self.pg4.remote_ip4, self.pg4.sw_if_index),
                VppRoutePath(self.pg5.remote_ip4, self.pg5.sw_if_index),
            ],
        )
        l3xc_2.add_vpp_config()

        self.assertTrue(find_l3xc(self, self.pg2.sw_if_index, 0xFFFFFFFF))

        self.logger.info(self.vapi.cli("sh l3xc"))

        #
        # fire in packets. If it's forwarded then the L3XC was successful,
        # since default routing will drop it
        #
        p_1 = (
            Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
            / IP(src="1.1.1.1", dst="1.1.1.2")
            / UDP(sport=1234, dport=1234)
            / Raw(b"\xa5" * 100)
        )
        # self.send_and_expect(self.pg0, p_1*NUM_PKTS, self.pg1)

        p_2 = []
        for ii in range(NUM_PKTS):
            p_2.append(
                Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
                / IP(src="1.1.1.1", dst="1.1.1.2")
                / UDP(sport=1000 + ii, dport=1234)
                / Raw(b"\xa5" * 100)
            )
        self.send_and_expect_load_balancing(
            self.pg2, p_2, [self.pg3, self.pg4, self.pg5]
        )

        l3xc_2.remove_vpp_config()
        self.send_and_assert_no_replies(self.pg2, p_2)


if __name__ == "__main__":
    unittest.main(testRunner=VppTestRunner)