#!/usr/bin/env python3
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import unittest

import ipv6
import thread_cert

LEADER = 1
ROUTER = 2


class TestIPv6SourceSelection(thread_cert.TestCase):
    SUPPORT_NCP = False

    TOPOLOGY = {
        LEADER: {
            'mode': 'rdn',
            'panid': 0xcafe,
            'allowlist': [ROUTER]
        },
        ROUTER: {
            'mode': 'rdn',
            'panid': 0xcafe,
            'allowlist': [LEADER]
        },
    }

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

        self.nodes[ROUTER].start()
        self.simulator.go(5)
        self.assertEqual(self.nodes[ROUTER].get_state(), 'router')

        leader_aloc = self.nodes[LEADER].get_addr_leader_aloc()
        leader_mleid = self.nodes[LEADER].get_mleid()
        leader_rloc = self.nodes[LEADER].get_rloc()
        leader_linklocal = self.nodes[LEADER].get_linklocal()
        multicast_addr = 'ff03::1'
        external_addr = '2007::1'

        router_rloc = self.nodes[ROUTER].get_rloc()
        router_linklocal = self.nodes[ROUTER].get_linklocal()
        router_mleid = self.nodes[ROUTER].get_mleid()

        # Source check - RLOC source for RLOC destination
        self.assertTrue(self.nodes[ROUTER].ping(leader_rloc))
        router_msgs = self.simulator.get_messages_sent_by(ROUTER)
        msg = router_msgs.get_icmp_message(ipv6.ICMP_ECHO_REQUEST)
        msg.assertSentFromSourceAddress(router_rloc)

        # Source check - ML-EID source for ALOC destination
        self.assertTrue(self.nodes[ROUTER].ping(leader_aloc))
        router_msgs = self.simulator.get_messages_sent_by(ROUTER)
        msg = router_msgs.get_icmp_message(ipv6.ICMP_ECHO_REQUEST)
        msg.assertSentFromSourceAddress(router_mleid)

        # Source check - ML-EID source for ML-EID destination
        self.assertTrue(self.nodes[ROUTER].ping(leader_mleid))
        router_msgs = self.simulator.get_messages_sent_by(ROUTER)
        msg = router_msgs.get_icmp_message(ipv6.ICMP_ECHO_REQUEST)
        msg.assertSentFromSourceAddress(router_mleid)

        # Source check - link local source source for link local address
        self.assertTrue(self.nodes[ROUTER].ping(leader_linklocal))
        router_msgs = self.simulator.get_messages_sent_by(ROUTER)
        msg = router_msgs.get_icmp_message(ipv6.ICMP_ECHO_REQUEST)
        msg.assertSentFromSourceAddress(router_linklocal)

        # Source check - ML-EID source for realmlocal multicast destination
        self.assertTrue(self.nodes[ROUTER].ping(multicast_addr))
        router_msgs = self.simulator.get_messages_sent_by(ROUTER)
        msg = router_msgs.get_icmp_message(ipv6.ICMP_ECHO_REQUEST)
        msg.assertSentFromSourceAddress(router_mleid)

        # GUA and default gateway
        self.nodes[LEADER].add_prefix('2001::/64', 'paros')
        self.nodes[LEADER].register_netdata()
        self.simulator.go(5)

        # Set lowpan context of sniffer
        self.simulator.set_lowpan_context(1, '2001::/64')

        # Flushes message queue before next ping
        router_msgs = self.simulator.get_messages_sent_by(ROUTER)

        # Source check - GUA source for GUA destination
        leader_gua = self.nodes[LEADER].get_addr("2001::/64")
        router_gua = self.nodes[ROUTER].get_addr("2001::/64")
        self.assertTrue(leader_gua is not None)
        self.assertTrue(router_gua is not None)
        self.assertTrue(self.nodes[ROUTER].ping(leader_gua))
        router_msgs = self.simulator.get_messages_sent_by(ROUTER)
        msg = router_msgs.get_icmp_message(ipv6.ICMP_ECHO_REQUEST)
        msg.assertSentFromSourceAddress(router_gua)

        # Source check - GUA source for external address (default route)
        self.nodes[ROUTER].ping(external_addr)
        router_msgs = self.simulator.get_messages_sent_by(ROUTER)
        msg = router_msgs.get_icmp_message(ipv6.ICMP_ECHO_REQUEST)
        msg.assertSentFromSourceAddress(router_gua)


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