#!/usr/bin/env python3
from osmo_gsm_tester.testenv import *

import time

test_config = tenv.config_test_specific()
duration = int(test_config.get('duration', 0)) # 0 = one HO loop
threshold = int(test_config.get('threshold', 2))

import pprint
print("TEST_CONFIG:\n" + pprint.pformat(test_config))

# attenuation from 0 to 10, then back to 0
cell1_att_li = list(range(0, 11, 1)) + list(range(9, -1, -1))
# attenuation from 10 to 0, then back to 10
cell2_att_li = list(range(10, 0, -1)) + list(range(0, 11, 1))

def do_one_ho_loop(rfemu_cell1, rfemu_cell2):
    step = 0
    while step < len(cell1_att_li):
        rfemu_cell1.set_attenuation(cell1_att_li[step])
        rfemu_cell2.set_attenuation(cell2_att_li[step])
        step += 1
        sleep(1)

epc = tenv.epc()
enb = tenv.enb()
ue = tenv.modem()
iperf3srv = tenv.iperf3srv({'addr': epc.tun_addr()})
iperf3srv.set_run_node(epc.run_node())
iperf3cli = iperf3srv.create_client()
iperf3cli.set_run_node(ue.run_node())

epc.subscriber_add(ue)
epc.start()
enb.ue_add(ue)
enb.start(epc)

print('waiting for ENB to connect to EPC...')
wait(epc.enb_is_connected, enb)
print('ENB is connected to EPC')

ue.connect(enb)

iperf3srv.start()
proc = iperf3cli.prepare_test_proc(iperf3cli.DIR_UL, ue.netns(), duration + 30)

print('waiting for UE to attach...')
wait(ue.is_registered)
print('UE is attached')

rfemu_cell1 = enb.get_rfemu(0)
rfemu_cell2 = enb.get_rfemu(1)

print('Iterating for %d seconds to produce at least %d handovers...' % (duration, threshold))
try:
    proc.launch()
    t_end = time.time() + duration
    if duration == 0:
        t_end += 1 # allow loop to run once
    while time.time() < t_end:
        do_one_ho_loop(rfemu_cell1, rfemu_cell2)
    num_handovers = ue.get_counter('handover_success')
    if num_handovers < threshold:
        raise Exception('Wrong number of handovers %d < threshold %d during %d seconds' % (num_handovers, threshold, duration))
except Exception as e:
    try:
        proc.terminate() # make sure we always terminate the process
    except Exception:
            print("Exception while terminating process %r" % repr(process))
    raise e

res_str = 'Got %d successful handovers (>= %d) during %d seconds' % (num_handovers, threshold, duration)
print(res_str)
test.set_report_stdout(res_str)
proc.terminate()
proc.wait()
print("Done")