#!/usr/bin/env python3
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import unittest

import config
import mle
import thread_cert
from pktverify.consts import MLE_PARENT_REQUEST, MLE_PARENT_RESPONSE, MLE_CHILD_ID_REQUEST, SOURCE_ADDRESS_TLV, MODE_TLV, TIMEOUT_TLV, CHALLENGE_TLV, RESPONSE_TLV, LINK_LAYER_FRAME_COUNTER_TLV, ADDRESS16_TLV, LEADER_DATA_TLV, NETWORK_DATA_TLV, TLV_REQUEST_TLV, SCAN_MASK_TLV, CONNECTIVITY_TLV, LINK_MARGIN_TLV, VERSION_TLV, ADDRESS_REGISTRATION_TLV
from pktverify.packet_verifier import PacketVerifier
from pktverify.null_field import nullField

LEADER = 1
ROUTER1 = 2
ROUTER2 = 3
ROUTER3 = 4
ROUTER4 = 5

# Test Purpose and Description:
# -----------------------------
# The purpose of this test case is to verify that the DUT chooses
# to attach to a router with better connectivity
#
# Test Topology:
# -------------
#     Leader--Router1
#       /  \     /
# Router2  Router3
#       \  /
#      Router4[DUT]
#
# DUT Types:
# ----------
#  Router


class Cert_5_1_08_RouterAttachConnectivity(thread_cert.TestCase):
    USE_MESSAGE_FACTORY = False

    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, ROUTER4]
        },
        ROUTER3: {
            'name': 'ROUTER_3',
            'mode': 'rdn',
            'allowlist': [LEADER, ROUTER1, ROUTER4]
        },
        ROUTER4: {
            'name': 'ROUTER_4',
            'mode': 'rdn',
            '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[ROUTER4].start()
        self.simulator.go(5)
        self.assertEqual(self.nodes[ROUTER4].get_state(), 'router')

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

        ROUTER_2 = pv.vars['ROUTER_2']
        ROUTER_3 = pv.vars['ROUTER_3']
        ROUTER_4 = pv.vars['ROUTER_4']

        # Step 1: Verify all routers and Leader are sending MLE advertisements.
        for i in (1, 2, 3):
            with pkts.save_index():
                pv.verify_attached('ROUTER_%d' % i)

        # Step 3: DUT sends a MLE Parent Request with an IP hop limit of
        #         255 to the Link-Local All Routers multicast address (FF02::2).
        #         The following TLVs MUST be present in the MLE Parent Request:
        #            - Challenge TLV
        #            - Mode TLV
        #            - Scan Mask TLV
        #                If the DUT sends multiple MLE Parent Requests
        #                    - The first one MUST be sent only to all Routers
        #                    - Subsequent ones MAY be sent to all Routers and REEDS
        #            -  Version TLV
        #         If the first MLE Parent Request was sent to all Routers and
        #         REEDS, the test fails.

        pkts.filter_wpan_src64(ROUTER_4).\
            filter_LLARMA().\
            filter_mle_cmd(MLE_PARENT_REQUEST).\
            filter(lambda p: {
                              CHALLENGE_TLV,
                              MODE_TLV,
                              SCAN_MASK_TLV,
                              VERSION_TLV
                              } <= set(p.mle.tlv.type) and\
                   p.ipv6.hlim == 255 and\
                   p.mle.tlv.scan_mask.r == 1 and\
                   p.mle.tlv.scan_mask.e == 0
                   ).\
            must_next()

        # Step 4: Router2 and Router3 respond with a MLE Parent Response.
        #         The following TLVs MUST be present in the MLE Parent Response:
        #             - Challenge TLV
        #             - Connectivity TLV
        #             - Leader Data TLV
        #             - Link-layer Frame Counter TLV
        #             - Link Margin TLV
        #             - Response TLV
        #             - Source Address
        #             - Version TLV
        #             - MLE Frame Counter TLV (optional)

        for i in (2, 3):
            with pkts.save_index():
                pkts.filter_wpan_src64(pv.vars['ROUTER_%d' % i]).\
                    filter_wpan_dst64(ROUTER_4).\
                    filter_mle_cmd(MLE_PARENT_RESPONSE).\
                    filter(lambda p: {
                                      CHALLENGE_TLV,
                                      CONNECTIVITY_TLV,
                                      LEADER_DATA_TLV,
                                      LINK_LAYER_FRAME_COUNTER_TLV,
                                      LINK_MARGIN_TLV,
                                      RESPONSE_TLV,
                                      SOURCE_ADDRESS_TLV,
                                      VERSION_TLV
                                    } <= set(p.mle.tlv.type)
                           ).\
                    must_next()

        # Step 5: DUT sends a MLE Child ID Request to Router3.
        #         The following TLVs MUST be present in the MLE Child ID Request:
        #             - Link-layer Frame Counter TLV
        #             - Mode TLV
        #             - Response TLV
        #             - Timeout TLV
        #             - TLV Request TLV
        #                 - Address16 TLV
        #                 - Network Data TLV
        #                 - Route64 TLV (optional)
        #             - Version TLV
        #             - MLE Frame Counter TLV (optional)
        #         The following TLV MUST NOT be present in the MLE Child ID Request:
        #             - Address Registration TLV

        _pkt = pkts.filter_wpan_src64(ROUTER_4).\
            filter_wpan_dst64(ROUTER_3).\
            filter_mle_cmd(MLE_CHILD_ID_REQUEST).\
            filter(lambda p: {
                              LINK_LAYER_FRAME_COUNTER_TLV,
                              MODE_TLV,
                              RESPONSE_TLV,
                              TIMEOUT_TLV,
                              TLV_REQUEST_TLV,
                              ADDRESS16_TLV,
                              NETWORK_DATA_TLV,
                              VERSION_TLV
                    } <= set(p.mle.tlv.type) and\
                   p.mle.tlv.addr16 is nullField and\
                   p.thread_nwd.tlv.type is nullField
                   ).\
            must_next()
        _pkt.must_not_verify(lambda p: (ADDRESS_REGISTRATION_TLV) in p.mle.tlv.type)


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