#!/usr/bin/env python3
#
#  Copyright (c) 2019, The OpenThread Authors.
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import wpan

# -----------------------------------------------------------------------------------------------------------------------
# Test description:
#
# This test covers a situation where a single parent exists in network with poor link quality ensuring the child
# can attach the parent.

test_name = __file__[:-3] if __file__.endswith('.py') else __file__
print('-' * 120)
print('Starting \'{}\''.format(test_name))

# -----------------------------------------------------------------------------------------------------------------------
# Creating `wpan.Nodes` instances

speedup = 4
wpan.Node.set_time_speedup_factor(speedup)

parent = wpan.Node()
child = wpan.Node()

# -----------------------------------------------------------------------------------------------------------------------
# Init all nodes

wpan.Node.init_all_nodes()

# -----------------------------------------------------------------------------------------------------------------------
# Test implementation

parent.form("network")

# Create a poor link between child and parent using MAC fixed RSSI filter

parent.set(wpan.WPAN_MAC_FILTER_FIXED_RSSI, '-99')
parent.add(wpan.WPAN_MAC_FILTER_ENTRIES, child.get(wpan.WPAN_EXT_ADDRESS)[1:-1])

child.set(wpan.WPAN_MAC_FILTER_FIXED_RSSI, '-99')
child.add(wpan.WPAN_MAC_FILTER_ENTRIES, parent.get(wpan.WPAN_EXT_ADDRESS)[1:-1])

# Ensure child can still attach the single low-link quality parent
child.join_node(parent, node_type=wpan.JOIN_TYPE_END_DEVICE)

# -----------------------------------------------------------------------------------------------------------------------
# Test finished

wpan.Node.finalize_all_nodes()

print('\'{}\' passed.'.format(test_name))