# Copyright (c) 2017 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 logging
import multiprocessing
import os
import time

from yardstick.network_services.vnf_generic.vnf.base import QueueFileWrapper
from yardstick.network_services.vnf_generic.vnf.prox_helpers import ProxResourceHelper
from yardstick.network_services.vnf_generic.vnf.prox_helpers import ProxDpdkVnfSetupEnvHelper
from yardstick.network_services.vnf_generic.vnf.sample_vnf import SampleVNF

LOG = logging.getLogger(__name__)


class ProxApproxVnf(SampleVNF):

    APP_NAME = 'PROX'
    APP_WORD = 'PROX'
    PROX_MODE = "Workload"
    VNF_PROMPT = "PROX started"
    LUA_PARAMETER_NAME = "sut"

    def __init__(self, name, vnfd, setup_env_helper_type=None, resource_helper_type=None):
        if setup_env_helper_type is None:
            setup_env_helper_type = ProxDpdkVnfSetupEnvHelper

        if resource_helper_type is None:
            resource_helper_type = ProxResourceHelper

        super(ProxApproxVnf, self).__init__(name, vnfd, setup_env_helper_type,
                                            resource_helper_type)
        self._result = {}
        self._terminated = multiprocessing.Value('i', 0)
        self._queue = multiprocessing.Value('i', 0)

    def instantiate(self, scenario_cfg, context_cfg):
        LOG.info("printing .........prox instantiate ")

        self.scenario_helper.scenario_cfg = scenario_cfg

        # this won't work we need 1GB hugepages at boot
        self.setup_helper.setup_vnf_environment()

        # self.connection.run("cat /proc/cpuinfo")

        prox_args, prox_path, remote_path = self.resource_helper.get_process_args()

        self.q_in = multiprocessing.Queue()
        self.q_out = multiprocessing.Queue()
        self.queue_wrapper = QueueFileWrapper(self.q_in, self.q_out, "PROX started")
        self._vnf_process = multiprocessing.Process(target=self._run_prox,
                                                    args=(remote_path, prox_path, prox_args))
        self._vnf_process.start()

    def _vnf_up_post(self):
        self.resource_helper.up_post()

    def _run_prox(self, file_wrapper, config_path, prox_path, prox_args):
        # This runs in a different process and should not share an SSH connection
        # with the rest of the object
        self.ssh_helper.drop_connection()

        time.sleep(self.WAIT_TIME)

        args = " ".join(" ".join([k, v if v else ""]) for k, v in prox_args.items())

        cmd_template = "sudo bash -c 'cd {}; {} -o cli {} -f {} '"
        prox_cmd = cmd_template.format(os.path.dirname(prox_path), prox_path, args, config_path)

        LOG.debug(prox_cmd)
        self.ssh_helper.run(prox_cmd, stdin=file_wrapper, stdout=file_wrapper,
                            keep_stdin_open=True, pty=False)

    def vnf_execute(self, cmd, wait_time=2):
        # try to execute with socket commands
        self.resource_helper.execute(cmd)

    def collect_kpi(self):
        if self.resource_helper is None:
            result = {
                "packets_in": 0,
                "packets_dropped": 0,
                "packets_fwd": 0,
                "collect_stats": {"core": {}},
            }
            return result

        if len(self.vnfd_helper.interfaces) not in {2, 4}:
            raise RuntimeError("Failed ..Invalid no of ports .. "
                               "2 or 4 ports only supported at this time")

        port_stats = self.resource_helper.execute('port_stats', self.vnfd_helper.interfaces)
        rx_total = port_stats[6]
        tx_total = port_stats[7]
        result = {
            "packets_in": tx_total,
            "packets_dropped": (tx_total - rx_total),
            "packets_fwd": rx_total,
            "collect_stats": self.resource_helper.collect_kpi(),
        }
        return result

    def _tear_down(self):
        self.setup_helper.rebind_drivers()