# Copyright 2016 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import logging
import random
import time

from autotest_lib.client.common_lib import error
from autotest_lib.server.cros.cfm import cfm_base_test

_SHORT_TIMEOUT = 2


class enterprise_CFM_VolumeChange(cfm_base_test.CfmBaseTest):
    """
    Volume changes made in the CFM / hotrod app should be accurately reflected
    in CrOS.
    """
    version = 1


    def _change_volume(self, repeat, cmd):
        """
        Change volume using CFM api and cross check with cras_test_client
        output.

        @param repeat: Number of times the volume should be changed.
        @param cmd: cras_test_client command to run.
        @raises error.TestFail if cras volume does not match volume set by CFM.
        """
        # This is used to trigger crbug.com/614885
        for volume in range(55, 85):
            self.cfm_facade.set_speaker_volume(volume)
            time.sleep(random.uniform(0.01, 0.05))

        for _ in xrange(repeat):
            # There is a minimal volume threshold so we can't start at 0%.
            # See crbug.com/633809 for more info.
            cfm_volume = random.randrange(2, 100, 1)
            self.cfm_facade.set_speaker_volume(cfm_volume)
            time.sleep(_SHORT_TIMEOUT)

            # Get the volume report from cras_test_client
            cras_volume = int(
                self._host.run_output(cmd).splitlines()[0].strip())

            if cras_volume != cfm_volume:
                raise error.TestFail('Cras volume (%d) does not match '
                                     'volume set by CFM (%d).' %
                                     (cras_volume, cfm_volume))
            else:
                logging.info('Cras volume (%d) matches volume set by CFM (%d)',
                             cras_volume, cfm_volume)

    def run_once(self, repeat, cmd):
        """Runs the test."""
        self.cfm_facade.wait_for_telemetry_commands()
        self.cfm_facade.start_meeting_session()
        if self.cfm_facade.is_mic_muted():
            self.cfm_facade.unmute_mic()
        self._change_volume(repeat, cmd)
        self.cfm_facade.end_meeting_session()