#!/usr/bin/env python3
#
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import unittest

import config
import mle
import network_layer
import thread_cert

LEADER = 1
REED = 2

RSSI_LOW = -95
RSSI_HIGH = -45

ROUTER_UPGRADE_DELAY = 150

# Test Purpose and Description:
# -----------------------------
# The purpose of this test case is to show that a REED does not
# upgrade to router if it does not have a neighbor with link margin
# above threshold.
#
# Test Topology:
# -------------
# Leader
#    |
# REED
#
# DUT Types:
# ----------
#  Leader
#  REED


class TestRouterUpgrade(thread_cert.TestCase):
    USE_MESSAGE_FACTORY = False

    TOPOLOGY = {
        LEADER: {
            'name': 'LEADER',
            'mode': 'rdn',
            'allowlist': [REED]
        },
        REED: {
            'name': 'REED',
            'mode': 'rdn',
            'allowlist': [LEADER]
        },
    }

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

        self.nodes[REED].add_allowlist(self.nodes[LEADER].get_addr64(), rssi=RSSI_LOW)
        self.nodes[REED].enable_allowlist()

        self.nodes[REED].start()
        self.simulator.go(ROUTER_UPGRADE_DELAY)
        self.assertEqual(self.nodes[REED].get_state(), 'child')

        self.nodes[REED].add_allowlist(self.nodes[LEADER].get_addr64(), rssi=RSSI_HIGH)
        self.nodes[REED].enable_allowlist()

        self.simulator.go(ROUTER_UPGRADE_DELAY)
        self.assertEqual(self.nodes[REED].get_state(), 'router')


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