#!/usr/bin/env python3
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import sys
import os

# Add the current directory to sys.path to find verify_utils
CUR_DIR = os.path.dirname(os.path.abspath(__file__))
sys.path.append(CUR_DIR)

import verify_utils
from pktverify.packet_filter import PacketFilter

DEFAULT_LEASE_TIME = 7200
NEW_LEASE_TIME = 120
NEW_TTL = 10


def verify(pv):
    pkts: PacketFilter = pv.pkts
    pv.summary.show()

    CLIENT_EXT_ADDR = pv.vars['SRP_CLIENT']

    # 1. Register with default lease
    pkts.filter_wpan_src64(CLIENT_EXT_ADDR).filter('dns.flags.response == 0 and dns.resp.ttl == {DEFAULT_LEASE_TIME}',
                                                   DEFAULT_LEASE_TIME=DEFAULT_LEASE_TIME).must_next()

    # 2. Change server lease range and client lease interval to NEW_LEASE_TIME
    pkts.filter_wpan_src64(CLIENT_EXT_ADDR).filter('dns.flags.response == 0 and dns.resp.ttl == {NEW_LEASE_TIME}',
                                                   NEW_LEASE_TIME=NEW_LEASE_TIME).must_next()

    # 4. Change client TTL to NEW_TTL
    pkts.filter_wpan_src64(CLIENT_EXT_ADDR).filter('dns.flags.response == 0 and dns.resp.ttl == {NEW_TTL}',
                                                   NEW_TTL=NEW_TTL).must_next()

    # 5. Set TTL to 0 (which should use NEW_LEASE_TIME)
    pkts.filter_wpan_src64(CLIENT_EXT_ADDR).filter('dns.flags.response == 0 and dns.resp.ttl == {NEW_LEASE_TIME}',
                                                   NEW_LEASE_TIME=NEW_LEASE_TIME).must_next()


if __name__ == '__main__':
    verify_utils.run_main(verify)
