#!/usr/bin/env python3
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import unittest

import config
import thread_cert
from pktverify.consts import MLE_CHILD_ID_REQUEST, MLE_PARENT_REQUEST, MODE_TLV, CHALLENGE_TLV, SCAN_MASK_TLV, VERSION_TLV, RESPONSE_TLV, LINK_LAYER_FRAME_COUNTER_TLV, MLE_FRAME_COUNTER_TLV, TIMEOUT_TLV, ADDRESS_REGISTRATION_TLV, TLV_REQUEST_TLV, LINK_LOCAL_ALL_ROUTERS_MULTICAST_ADDRESS
from pktverify.packet_verifier import PacketVerifier

LEADER = 1
ROUTER1 = 2
ROUTER2 = 3
ROUTER3 = 4
ED = 5


class Cert_6_1_3_RouterAttachConnectivity(thread_cert.TestCase):
    TOPOLOGY = {
        LEADER: {
            'name': 'LEADER',
            'mode': 'rdn',
            'allowlist': [ROUTER1, ROUTER2, ROUTER3]
        },
        ROUTER1: {
            'name': 'ROUTER_1',
            'mode': 'rdn',
            'allowlist': [LEADER, ROUTER3]
        },
        ROUTER2: {
            'name': 'ROUTER_2',
            'mode': 'rdn',
            'allowlist': [LEADER, ED]
        },
        ROUTER3: {
            'name': 'ROUTER_3',
            'mode': 'rdn',
            'allowlist': [LEADER, ROUTER1, ED]
        },
        ED: {
            'name': 'ED',
            'is_mtd': True,
            'mode': 'rn',
            'allowlist': [ROUTER2, ROUTER3]
        },
    }

    def test(self):
        self.nodes[LEADER].start()
        self.simulator.go(5)
        self.assertEqual(self.nodes[LEADER].get_state(), 'leader')

        for i in range(2, 5):
            self.nodes[i].start()

        self.simulator.go(5)

        for i in range(2, 5):
            self.assertEqual(self.nodes[i].get_state(), 'router')

        self.simulator.go(config.MAX_ADVERTISEMENT_INTERVAL)

        self.nodes[ED].start()
        self.simulator.go(5)
        self.assertEqual(self.nodes[ED].get_state(), 'child')

        self.collect_ipaddrs()
        addrs = self.nodes[ED].get_addrs()
        for addr in addrs:
            self.assertTrue(self.nodes[ROUTER3].ping(addr))

    def verify(self, pv):
        pkts = pv.pkts
        pv.summary.show()

        ROUTER_3 = pv.vars['ROUTER_3']
        ED = pv.vars['ED']
        _router3_pkts = pkts.filter_wpan_src64(ROUTER_3)
        _ed_pkts = pkts.filter_wpan_src64(ED)

        # Step 2: The DUT MUST send a MLE Parent Request to the
        # All-Routers multicast address
        _ed_pkts.filter_mle_cmd(MLE_PARENT_REQUEST).filter_ipv6_dst(
            LINK_LOCAL_ALL_ROUTERS_MULTICAST_ADDRESS).must_next().must_verify(
                lambda p: {MODE_TLV, CHALLENGE_TLV, SCAN_MASK_TLV, VERSION_TLV} == set(p.mle.tlv.type
                                                                                      ) and p.mle.tlv.scan_mask.r == 1)

        # Step 3: Router_2, Router_3 Respond with MLE Parent Response
        # Step 4: DUT Send a Child ID Request to Router_3 due to better connectivity
        _ed_pkts.filter_mle_cmd(MLE_CHILD_ID_REQUEST).must_next().must_verify(
            lambda p: {
                RESPONSE_TLV, LINK_LAYER_FRAME_COUNTER_TLV, MLE_FRAME_COUNTER_TLV, MODE_TLV, TIMEOUT_TLV, VERSION_TLV,
                ADDRESS_REGISTRATION_TLV, TLV_REQUEST_TLV
            } <= set(p.mle.tlv.type))

        # Step 5: The DUT MUST respond with ICMPv6 Echo Reply
        ed_mleid = pv.vars['ED_MLEID']
        router3_mleid = pv.vars['ROUTER_3_MLEID']
        _pkt = _router3_pkts.filter(
            lambda p: p.ipv6.src == router3_mleid and p.ipv6.dst == ed_mleid).filter_ping_request().must_next()
        _ed_pkts.filter(lambda p: p.ipv6.src == ed_mleid and p.ipv6.dst == router3_mleid).filter_ping_reply(
            identifier=_pkt.icmpv6.echo.identifier).must_next()


if __name__ == '__main__':
    unittest.main()