#!/usr/bin/env python3
import unittest
from ipaddress import IPv4Network

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

from framework import VppTestCase
from asfframework import VppTestRunner
from vpp_interface import VppInterface
from vpp_ip_route import VppIpTable, VppIpRoute, VppRoutePath
from vpp_acl import AclRule, VppAcl, VppAclInterface
from config import config

NUM_PKTS = 67


class VppPipe(VppInterface):
    """
    VPP Pipe
    """

    @property
    def east(self):
        return self.result.pipe_sw_if_index[1]

    @property
    def west(self):
        return self.result.pipe_sw_if_index[0]

    def __init__(self, test, instance=0xFFFFFFFF):
        super(VppPipe, self).__init__(test)
        self._test = test
        self.instance = instance

    def add_vpp_config(self):
        self.result = self._test.vapi.pipe_create(
            0 if self.instance == 0xFFFFFFFF else 1, self.instance
        )
        self.set_sw_if_index(self.result.sw_if_index)

    def remove_vpp_config(self):
        self._test.vapi.pipe_delete(self.result.sw_if_index)

    def object_id(self):
        return "pipe-%d" % (self._sw_if_index)

    def query_vpp_config(self):
        pipes = self._test.vapi.pipe_dump()
        for p in pipes:
            if p.sw_if_index == self.result.sw_if_index:
                return True
        return False

    def set_unnumbered(self, ip_sw_if_index, is_east, is_add=True):
        if is_east:
            res = self._test.vapi.sw_interface_set_unnumbered(
                ip_sw_if_index, self.east, is_add
            )
        else:
            res = self._test.vapi.sw_interface_set_unnumbered(
                ip_sw_if_index, self.west, is_add
            )


@unittest.skipIf("acl" in config.excluded_plugins, "Exclude tests requiring ACL plugin")
class TestPipe(VppTestCase):
    """Pipes"""

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

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

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

        self.create_pg_interfaces(range(4))

        for i in self.pg_interfaces:
            i.admin_up()

    def tearDown(self):
        for i in self.pg_interfaces:
            i.admin_down()

        super(TestPipe, self).tearDown()

    def test_pipe(self):
        """Pipes"""

        pipes = [VppPipe(self), VppPipe(self, 10)]

        for p in pipes:
            p.add_vpp_config()
            p.admin_up()

        #
        # L2 cross-connect pipe0 east with pg0 and west with pg1
        #
        self.vapi.sw_interface_set_l2_xconnect(
            self.pg0.sw_if_index, pipes[0].east, enable=1
        )
        self.vapi.sw_interface_set_l2_xconnect(
            pipes[0].east, self.pg0.sw_if_index, enable=1
        )
        self.vapi.sw_interface_set_l2_xconnect(
            self.pg1.sw_if_index, pipes[0].west, enable=1
        )
        self.vapi.sw_interface_set_l2_xconnect(
            pipes[0].west, self.pg1.sw_if_index, enable=1
        )

        # test bi-directional L2 flow pg0<->pg1
        p = (
            Ether(src=self.pg0.remote_mac, dst=self.pg1.remote_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 * NUM_PKTS, self.pg1)
        self.send_and_expect(self.pg1, p * NUM_PKTS, self.pg0)

        #
        # Attach ACL to ensure features are run on the pipe
        #
        rule_1 = AclRule(
            is_permit=0,
            proto=17,
            src_prefix=IPv4Network("1.1.1.1/32"),
            dst_prefix=IPv4Network("1.1.1.2/32"),
            ports=1234,
        )
        acl = VppAcl(self, rules=[rule_1])
        acl.add_vpp_config()

        # Apply the ACL on the pipe on output
        acl_if_e = VppAclInterface(
            self, sw_if_index=pipes[0].east, n_input=0, acls=[acl]
        )
        acl_if_e.add_vpp_config()

        self.send_and_assert_no_replies(self.pg0, p * NUM_PKTS)
        self.send_and_expect(self.pg1, p * NUM_PKTS, self.pg0)

        # remove from output and apply on input
        acl_if_e.remove_vpp_config()
        acl_if_w = VppAclInterface(
            self, sw_if_index=pipes[0].west, n_input=1, acls=[acl]
        )
        acl_if_w.add_vpp_config()

        self.send_and_assert_no_replies(self.pg0, p * NUM_PKTS)
        self.send_and_expect(self.pg1, p * NUM_PKTS, self.pg0)

        acl_if_w.remove_vpp_config()
        self.send_and_expect(self.pg0, p * NUM_PKTS, self.pg1)
        self.send_and_expect(self.pg1, p * NUM_PKTS, self.pg0)

        #
        # L3 routes in two separate tables so a pipe can be used to L3
        # x-connect
        #
        tables = []
        tables.append(VppIpTable(self, 1))
        tables.append(VppIpTable(self, 2))

        for t in tables:
            t.add_vpp_config()

        self.pg2.set_table_ip4(1)
        self.pg2.config_ip4()
        self.pg2.resolve_arp()
        self.pg3.set_table_ip4(2)
        self.pg3.config_ip4()
        self.pg3.resolve_arp()

        routes = []
        routes.append(
            VppIpRoute(
                self,
                "1.1.1.1",
                32,
                [VppRoutePath(self.pg3.remote_ip4, self.pg3.sw_if_index)],
                table_id=2,
            )
        )
        routes.append(
            VppIpRoute(
                self,
                "1.1.1.1",
                32,
                [VppRoutePath("0.0.0.0", pipes[1].east)],
                table_id=1,
            )
        )
        routes.append(
            VppIpRoute(
                self,
                "1.1.1.2",
                32,
                [VppRoutePath("0.0.0.0", pipes[1].west)],
                table_id=2,
            )
        )
        routes.append(
            VppIpRoute(
                self,
                "1.1.1.2",
                32,
                [VppRoutePath(self.pg2.remote_ip4, self.pg2.sw_if_index)],
                table_id=1,
            )
        )

        for r in routes:
            r.add_vpp_config()

        p_east = (
            Ether(src=self.pg2.remote_mac, dst=self.pg2.local_mac)
            / IP(src="1.1.1.2", dst="1.1.1.1")
            / UDP(sport=1234, dport=1234)
            / Raw(b"\xa5" * 100)
        )

        # bind the pipe ends to the correct tables
        self.vapi.sw_interface_set_table(pipes[1].west, 0, 2)
        self.vapi.sw_interface_set_table(pipes[1].east, 0, 1)

        # IP is not enabled on the pipes at this point
        self.send_and_assert_no_replies(self.pg2, p_east * NUM_PKTS)

        # IP enable the Pipes by making them unnumbered
        pipes[1].set_unnumbered(self.pg2.sw_if_index, True)
        pipes[1].set_unnumbered(self.pg3.sw_if_index, False)

        self.send_and_expect(self.pg2, p_east * NUM_PKTS, self.pg3)

        # and the return path
        p_west = (
            Ether(src=self.pg3.remote_mac, dst=self.pg3.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.pg3, p_west * NUM_PKTS, self.pg2)

        #
        # Use ACLs to test features run on the Pipes
        #
        acl_if_e1 = VppAclInterface(
            self, sw_if_index=pipes[1].east, n_input=0, acls=[acl]
        )
        acl_if_e1.add_vpp_config()
        self.send_and_assert_no_replies(self.pg2, p_east * NUM_PKTS)
        self.send_and_expect(self.pg3, p_west * NUM_PKTS, self.pg2)

        # remove from output and apply on input
        acl_if_e1.remove_vpp_config()
        acl_if_w1 = VppAclInterface(
            self, sw_if_index=pipes[1].west, n_input=1, acls=[acl]
        )
        acl_if_w1.add_vpp_config()
        self.send_and_assert_no_replies(self.pg2, p_east * NUM_PKTS)
        self.send_and_expect(self.pg3, p_west * NUM_PKTS, self.pg2)
        acl_if_w1.remove_vpp_config()

        self.send_and_expect(self.pg2, p_east * NUM_PKTS, self.pg3)
        self.send_and_expect(self.pg3, p_west * NUM_PKTS, self.pg2)

        # cleanup (so the tables delete)
        self.pg2.unconfig_ip4()
        self.pg2.set_table_ip4(0)
        self.pg3.unconfig_ip4()
        self.pg3.set_table_ip4(0)
        self.vapi.sw_interface_set_table(pipes[1].west, 0, 0)
        self.vapi.sw_interface_set_table(pipes[1].east, 0, 0)


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