#!/usr/bin/python

##
## Copyright (c) 2020 Intel Corporation
##
## Licensed under the Apache License, Version 2.0 (the "License");
## you may not use this file except in compliance with the License.
## You may obtain a copy of the License at
##
##
##     http://www.apache.org/licenses/LICENSE-2.0
##
## Unless required by applicable law or agreed to in writing, software
## distributed under the License is distributed on an "AS IS" BASIS,
## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
## See the License for the specific language governing permissions and
## limitations under the License.
##

import sys
import time
import requests
from rapid_log import RapidLog
from rapid_test import RapidTest
from statistics import mean

class ImpairTest(RapidTest):
    """
    Class to manage the impair testing
    """
    def __init__(self, test_param, lat_percentile, runtime, testname,
            environment_file, gen_machine, sut_machine):
        super().__init__(test_param, runtime, testname, environment_file)
        self.gen_machine = gen_machine
        self.sut_machine = sut_machine
        self.test['lat_percentile'] = lat_percentile

    def run(self):
        result_details = {'Details': 'Nothing'}
        imix = self.test['imix']
        size = mean (imix)
        flow_number = self.test['flowsize']
        attempts = 0
        self.gen_machine.set_udp_packet_size(imix)
        flow_number = self.gen_machine.set_flows(flow_number)
        self.gen_machine.start_latency_cores()
        RapidLog.info("+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+")
        RapidLog.info("| Generator is sending UDP ({:>5} flow) packets ({:>5} bytes) to SUT via GW dropping and delaying packets. SUT sends packets back. Use ctrl-c to stop the test                               |".format(flow_number,round(size)))
        RapidLog.info("+--------+------------------+-------------+-------------+-------------+------------------------+----------+----------+----------+-----------+-----------+-----------+-----------+-------+----+")
        RapidLog.info('| Test   | Speed requested  | Gen by core | Sent by NIC | Fwrd by SUT | Rec. by core           | Avg. Lat.|{:.0f} Pcentil| Max. Lat.|   Sent    |  Received |    Lost   | Total Lost|L.Ratio|Time|'.format(self.test['lat_percentile']*100))
        RapidLog.info("+--------+------------------+-------------+-------------+-------------+------------------------+----------+----------+----------+-----------+-----------+-----------+-----------+-------+----+")

        speed = self.test['startspeed']
        self.gen_machine.set_generator_speed(speed)
        while True:
            attempts += 1
            print('Measurement ongoing at speed: ' + str(round(speed,2)) + '%      ',end='\r')
            sys.stdout.flush()
            time.sleep(1)
            # Get statistics now that the generation is stable and NO ARP messages any more
            iteration_data = self.run_iteration(float(self.test['runtime']),flow_number,size,speed)
            iteration_data['speed'] = speed
            # Drop rate is expressed in percentage. lat_used is a ratio (0 to 1). The sum of these 2 should be 100%.
            # If the sum is lower than 95, it means that more than 5% of the latency measurements where dropped for accuracy reasons.
            if (iteration_data['drop_rate'] + iteration_data['lat_used'] * 100) < 95:
                lat_warning = bcolors.WARNING + ' Latency accuracy issue?: {:>3.0f}%'.format(iteration_data['lat_used']*100) +  bcolors.ENDC
            else:
                lat_warning = ''
            iteration_prefix = {'speed' : '',
                    'lat_avg' : '',
                    'lat_perc' : '',
                    'lat_max' : '',
                    'abs_drop_rate' : '',
                    'drop_rate' : ''}
            RapidLog.info(self.report_result(attempts, size, iteration_data,
                iteration_prefix))
            result_details = {'test': self.test['test'],
                    'environment_file': self.test['environment_file'],
                    'Flows': flow_number,
                    'Size': size,
                    'RequestedSpeed': RapidTest.get_pps(speed,size),
                    'CoreGenerated': iteration_data['pps_req_tx'],
                    'SentByNIC': iteration_data['pps_tx'],
                    'FwdBySUT': iteration_data['pps_sut_tx'],
                    'RevByCore': iteration_data['pps_rx'],
                    'AvgLatency': iteration_data['lat_avg'],
                    'PCTLatency': iteration_data['lat_perc'],
                    'MaxLatency': iteration_data['lat_max'],
                    'PacketsLost': iteration_data['abs_dropped'],
                    'DropRate': iteration_data['drop_rate'],
                    'bucket_size': iteration_data['bucket_size'],
                    'buckets': iteration_data['buckets']}
            result_details = self.post_data('rapid_impairtest', result_details)
        self.gen_machine.stop_latency_cores()
        return (True, result_details)