#    Copyright 2013-2015 ARM Limited
#
# 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.

# pylint: disable=W0201, C0103

import os
import re

from wlauto import Workload, Parameter, Executable


hackbench_results_txt = 'hackbench_results.txt'

regex_map = {"total_groups": (re.compile(r'(\d+) groups'), "groups"),
             "total_fd": (re.compile(r'(\d+) file descriptors'), "file_descriptors"),
             "total_messages": (re.compile(r'(\d+) messages'), "messages"),
             "total_bytes": (re.compile(r'(\d+) bytes'), "bytes"),
             "test_time": (re.compile(r'Time: (\d+.*)'), "seconds")
             }


class Hackbench(Workload):

    name = 'hackbench'
    description = """
    Hackbench runs a series of tests for the Linux scheduler.

    For details, go to:
    https://github.com/linux-test-project/ltp/

    """

    parameters = [
        # Workload parameters go here e.g.
        Parameter('datasize', kind=int, default=100, description='Message size in bytes.'),
        Parameter('groups', kind=int, default=10, description='Number of groups.'),
        Parameter('loops', kind=int, default=100, description='Number of loops.'),
        Parameter('fds', kind=int, default=40, description='Number of file descriptors.'),
        Parameter('extra_params', kind=str, default='',
                  description='Extra parameters to pass in. See the hackbench man page'
                              ' or type `hackbench --help` for list of options.'),
        Parameter('duration', kind=int, default=30, description='Test duration in seconds.')
    ]

    def setup(self, context):
        timeout_buf = 10
        self.command = '{} -s {} -g {} -l {} {} > {}'
        self.device_binary = None
        self.hackbench_result = os.path.join(self.device.working_directory, hackbench_results_txt)
        self.run_timeout = self.duration + timeout_buf

        self.binary_name = 'hackbench'
        host_binary = context.resolver.get(Executable(self, self.device.abi, self.binary_name))
        self.device_binary = self.device.install(host_binary)

        self.command = self.command.format(self.device_binary, self.datasize, self.groups,
                                           self.loops, self.extra_params, self.hackbench_result)

    def run(self, context):
        self.device.execute(self.command, timeout=self.run_timeout)

    def update_result(self, context):
        self.device.pull_file(self.hackbench_result, context.output_directory)

        with open(os.path.join(context.output_directory, hackbench_results_txt)) as hackbench_file:
            for line in hackbench_file:
                for label, (regex, units) in regex_map.iteritems():
                    match = regex.search(line)
                    if match:
                        context.result.add_metric(label, float(match.group(1)), units)

    def teardown(self, context):
        self.device.uninstall_executable(self.binary_name)
        self.device.execute('rm -f {}'.format(self.hackbench_result))

    def validate(self):
        pass