#!/usr/bin/env python3
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import unittest

import thread_cert
from pktverify.consts import MLE_CHILD_ID_REQUEST, MLE_CHILD_UPDATE_REQUEST, RESPONSE_TLV, LINK_LAYER_FRAME_COUNTER_TLV, MLE_FRAME_COUNTER_TLV, MODE_TLV, TIMEOUT_TLV, VERSION_TLV, ADDRESS_REGISTRATION_TLV, TLV_REQUEST_TLV
from pktverify.packet_verifier import PacketVerifier

LEADER = 1
ED = 2


class Cert_6_5_1_ChildResetReattach(thread_cert.TestCase):
    TOPOLOGY = {
        LEADER: {
            'name': 'LEADER',
            'mode': 'rdn',
            'allowlist': [ED]
        },
        ED: {
            'name': 'ED',
            'is_mtd': True,
            'mode': 'rn',
            'allowlist': [LEADER]
        },
    }

    def _setUpEd(self):
        self.nodes[ED].add_allowlist(self.nodes[LEADER].get_addr64())
        self.nodes[ED].enable_allowlist()

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

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

        self.nodes[LEADER].remove_allowlist(self.nodes[ED].get_addr64())
        self.nodes[ED].remove_allowlist(self.nodes[LEADER].get_addr64())

        self.nodes[ED].reset()
        self._setUpEd()
        self.simulator.go(5)
        self.nodes[ED].start()

        self.simulator.go(5)
        self.nodes[LEADER].add_allowlist(self.nodes[ED].get_addr64())
        self.simulator.go(5)
        self.assertEqual(self.nodes[ED].get_state(), 'child')

        addrs = self.nodes[ED].get_addrs()
        for addr in addrs:
            if addr[0:4] == 'fe80':
                self.assertTrue(self.nodes[LEADER].ping(addr))

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

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

        # Step 2: Reset the DUT for a time greater than
        # the Child Timeout Duration.
        # Step 3: Send MLE Child Update Request to Leader
        _ed_pkts.filter_mle_cmd(MLE_CHILD_ID_REQUEST).must_next()
        _ed_pkts.filter_mle_cmd(MLE_CHILD_UPDATE_REQUEST).must_next().must_verify(
            lambda p: {MODE_TLV} < set(p.mle.tlv.type))

        # Step 5: DUT reattaches to Leader
        _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 6: The DUT MUST respond with ICMPv6 Echo Reply
        _ed_pkts.filter_ping_reply().filter(lambda p: p.wpan.src64 == ED and p.wpan.dst64 == LEADER).must_next()


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