# Copyright 2015 Spirent Communications.
#
# 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.

"""
Code to integrate Spirent TestCenter with the vsperf test framework.

Provides a model for Spirent TestCenter as a test tool for implementing
various performance tests of a virtual switch.
"""

from __future__ import print_function

from tools.pkt_gen import trafficgen
from core.results.results_constants import ResultsConstants
import subprocess
import os
import csv
from conf import settings


class TestCenter(trafficgen.ITrafficGenerator):
    """
    Spirent TestCenter
    """
    def connect(self):
        """
        Do nothing.
        """
        return self

    def disconnect(self):
        """
        Do nothing.
        """
        pass

    def send_burst_traffic(self, traffic=None, numpkts=100, duration=20, framerate=100):
        """
        Do nothing.
        """
        return None

    def send_cont_traffic(self, traffic=None, duration=30, framerate=0,
                          multistream=False):
        """
        Do nothing.
        """
        return None

    def send_rfc2544_throughput(self, traffic=None, trials=3, duration=20,
                                lossrate=0.0, multistream=False):
        """
        Send traffic per RFC2544 throughput test specifications.
        """
        verbose = False

        args = [settings.getValue("TRAFFICGEN_STC_PYTHON2_PATH"),
                os.path.join(settings.getValue("TRAFFICGEN_STC_TESTCENTER_PATH"),
                             settings.getValue("TRAFFICGEN_STC_RFC2544_TPUT_TEST_FILE_NAME")),
                "--lab_server_addr",
                settings.getValue("TRAFFICGEN_STC_LAB_SERVER_ADDR"),
                "--license_server_addr",
                settings.getValue("TRAFFICGEN_STC_LICENSE_SERVER_ADDR"),
                "--east_chassis_addr",
                settings.getValue("TRAFFICGEN_STC_EAST_CHASSIS_ADDR"),
                "--east_slot_num",
                settings.getValue("TRAFFICGEN_STC_EAST_SLOT_NUM"),
                "--east_port_num",
                settings.getValue("TRAFFICGEN_STC_EAST_PORT_NUM"),
                "--west_chassis_addr",
                settings.getValue("TRAFFICGEN_STC_WEST_CHASSIS_ADDR"),
                "--west_slot_num",
                settings.getValue("TRAFFICGEN_STC_WEST_SLOT_NUM"),
                "--west_port_num",
                settings.getValue("TRAFFICGEN_STC_WEST_PORT_NUM"),
                "--test_session_name",
                settings.getValue("TRAFFICGEN_STC_TEST_SESSION_NAME"),
                "--results_dir",
                settings.getValue("TRAFFICGEN_STC_RESULTS_DIR"),
                "--csv_results_file_prefix",
                settings.getValue("TRAFFICGEN_STC_CSV_RESULTS_FILE_PREFIX"),
                "--num_trials",
                settings.getValue("TRAFFICGEN_STC_NUMBER_OF_TRIALS"),
                "--trial_duration_sec",
                settings.getValue("TRAFFICGEN_STC_TRIAL_DURATION_SEC"),
                "--traffic_pattern",
                settings.getValue("TRAFFICGEN_STC_TRAFFIC_PATTERN"),
                "--search_mode",
                settings.getValue("TRAFFICGEN_STC_SEARCH_MODE"),
                "--learning_mode",
                settings.getValue("TRAFFICGEN_STC_LEARNING_MODE"),
                "--rate_lower_limit_pct",
                settings.getValue("TRAFFICGEN_STC_RATE_LOWER_LIMIT_PCT"),
                "--rate_upper_limit_pct",
                settings.getValue("TRAFFICGEN_STC_RATE_UPPER_LIMIT_PCT"),
                "--rate_initial_pct",
                settings.getValue("TRAFFICGEN_STC_RATE_INITIAL_PCT"),
                "--rate_step_pct",
                settings.getValue("TRAFFICGEN_STC_RATE_STEP_PCT"),
                "--resolution_pct",
                settings.getValue("TRAFFICGEN_STC_RESOLUTION_PCT"),
                "--frame_size_list",
                settings.getValue("TRAFFICGEN_STC_FRAME_SIZE"),
                "--acceptable_frame_loss_pct",
                settings.getValue("TRAFFICGEN_STC_ACCEPTABLE_FRAME_LOSS_PCT"),
                "--east_intf_addr",
                settings.getValue("TRAFFICGEN_STC_EAST_INTF_ADDR"),
                "--east_intf_gateway_addr",
                settings.getValue("TRAFFICGEN_STC_EAST_INTF_GATEWAY_ADDR"),
                "--west_intf_addr",
                settings.getValue("TRAFFICGEN_STC_WEST_INTF_ADDR"),
                "--west_intf_gateway_addr",
                settings.getValue("TRAFFICGEN_STC_WEST_INTF_GATEWAY_ADDR")]
        if settings.getValue("TRAFFICGEN_STC_VERBOSE") is "True":
            args.append("--verbose")
            verbose = True
            print("Arguments used to call test: %s" % args)

        subprocess.check_call(args)

        file = os.path.join(settings.getValue("TRAFFICGEN_STC_RESULTS_DIR"),
                            settings.getValue("TRAFFICGEN_STC_CSV_RESULTS_FILE_PREFIX") + ".csv")
        if verbose:
            print("file: %s" % file)

        result = {}

        with open(file, "r") as csvfile:
            csvreader = csv.DictReader(csvfile)
            for row in csvreader:
                print("Row: %s" % row)
                result[ResultsConstants.TX_RATE_FPS] = 0.0
                result[ResultsConstants.THROUGHPUT_RX_FPS] = 0.0
                result[ResultsConstants.TX_RATE_MBPS] = 0.0
                result[ResultsConstants.THROUGHPUT_RX_MBPS] = 0.0
                result[ResultsConstants.TX_RATE_PERCENT] = float(row["OfferedLoad(%)"])
                result[ResultsConstants.THROUGHPUT_RX_PERCENT] = float(row["Throughput(%)"])
                result[ResultsConstants.MIN_LATENCY_NS] = float(row["MinimumLatency(us)"]) * 1000
                result[ResultsConstants.MAX_LATENCY_NS] = float(row["MaximumLatency(us)"]) * 1000
                result[ResultsConstants.AVG_LATENCY_NS] = float(row["AverageLatency(us)"]) * 1000
        return result

if __name__ == '__main__':
    TRAFFIC = {
        'l3': {
            'proto': 'tcp',
            'srcip': '1.1.1.1',
            'dstip': '90.90.90.90',
        },
    }

    with TestCenter() as dev:
        print(dev.send_rfc2544_throughput(traffic=TRAFFIC))