# Copyright 2015 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 time


from autotest_lib.client.common_lib import error
from autotest_lib.client.common_lib.cros.network import ping_runner
from autotest_lib.client.common_lib.cros.network import xmlrpc_datatypes
from autotest_lib.client.cros.chameleon import chameleon_audio_helper
from autotest_lib.client.cros.chameleon import chameleon_audio_ids
from autotest_lib.server.cros.audio import audio_test
from autotest_lib.server.cros.multimedia import remote_facade_factory
from autotest_lib.server.cros.network import netperf_runner
from autotest_lib.server.cros.network import netperf_session
from autotest_lib.server.cros.network import wifi_cell_test_base


class network_WiFi_BluetoothStreamPerf(wifi_cell_test_base.WiFiCellTestBase):
    """Test maximal achievable bandwidth on several channels per band.

    Conducts a performance test for a set of specified router configurations
    and reports results as keyval pairs.

    """

    version = 1

    NETPERF_CONFIGS = [
            netperf_runner.NetperfConfig(
                       netperf_runner.NetperfConfig.TEST_TYPE_TCP_STREAM),
            netperf_runner.NetperfConfig(
                       netperf_runner.NetperfConfig.TEST_TYPE_TCP_MAERTS),
            netperf_runner.NetperfConfig(
                       netperf_runner.NetperfConfig.TEST_TYPE_UDP_STREAM),
            netperf_runner.NetperfConfig(
                       netperf_runner.NetperfConfig.TEST_TYPE_UDP_MAERTS),
    ]


    def parse_additional_arguments(self, commandline_args, additional_params):
        """Hook into super class to take control files parameters.

        @param commandline_args dict of parsed parameters from the autotest.
        @param additional_params list of HostapConfig objects.

        """
        self._ap_configs = additional_params


    def test_one(self, session, config, ap_config_tag, bt_tag):
        """Run one iteration of wifi testing.

        @param session NetperfSession session
        @param config NetperfConfig config
        @param ap_config_tag string for AP configuration
        @param bt_tag string for BT operation

        """
        get_ping_config = lambda period: ping_runner.PingConfig(
                self.context.get_wifi_addr(), interval=1, count=period)

        logging.info('testing config %s, ap_config %s, BT:%s',
                     config.tag, ap_config_tag, bt_tag)
        test_str = '_'.join([ap_config_tag, bt_tag])
        time.sleep(1)

        # Record the signal level.
        signal_level = self.context.client.wifi_signal_level
        signal_description = '_'.join(['signal', test_str])
        self.write_perf_keyval({signal_description: signal_level})

        # Run netperf and log the results.
        results = session.run(config)
        if not results:
            logging.error('Failed to take measurement for %s',
                          config.tag)
            return
        values = [result.throughput for result in results]
        self.output_perf_value(config.tag + '_' + bt_tag, values, units='Mbps',
                               higher_is_better=True,
                               graph=ap_config_tag)
        result = netperf_runner.NetperfResult.from_samples(results)
        self.write_perf_keyval(result.get_keyval(
            prefix='_'.join([config.tag, test_str])))

        # Log the drop in throughput compared with the 'BT_disconnected'
        # baseline.  Only positive values are valid.  Report the drop as a
        # whole integer percentage of (base_through-through)/base_through.
        if bt_tag == 'BT_disconnected':
            self.base_through = result.throughput
        elif self.base_through > 0:
            drop = int( (self.base_through - result.throughput) * 100 /
                        self.base_through)
            self.output_perf_value(config.tag + '_' + bt_tag + '_drop',
                                   drop, units='percent_drop',
                                   higher_is_better=False,
                                   graph=ap_config_tag + '_drop')
            self.write_perf_keyval({'_'.join([config.tag, test_str, 'drop']):
                                   drop})
            logging.info('logging drop value as %d%%', drop)

        # Test latency with ping.
        result_ping = self.context.client.ping(get_ping_config(3))
        self.write_perf_keyval(
            { '_'.join(['ping', test_str]): result_ping.avg_latency })
        logging.info('Ping statistics with %s: %r', bt_tag, result_ping)


    def run_once(self, host):
        """Test body."""
        start_time = time.time()

        # Setup Bluetooth widgets and their binder, but do not yet connect.
        audio_test.audio_test_requirement()
        factory = remote_facade_factory.RemoteFacadeFactory(
                host, results_dir=self.resultsdir)
        chameleon_board = host.chameleon
        if chameleon_board is None:
            raise error.TestNAError("No chameleon device is present")

        chameleon_board.setup_and_reset(self.outputdir)
        widget_factory = chameleon_audio_helper.AudioWidgetFactory(
                factory, host)
        source = widget_factory.create_widget(
            chameleon_audio_ids.CrosIds.BLUETOOTH_HEADPHONE)
        bluetooth_widget = widget_factory.create_widget(
            chameleon_audio_ids.PeripheralIds.BLUETOOTH_DATA_RX)
        binder = widget_factory.create_binder(
                source, bluetooth_widget)
        audio_test_file = 'http://commondatastorage.googleapis.com/' \
                          'chromiumos-test-assets-public/audio_test/' \
                          'chameleon/Headphone/test_256_16.mp3'


        for ap_config in self._ap_configs:
            # Set up the router and associate the client with it.
            self.context.configure(ap_config)
            assoc_params = xmlrpc_datatypes.AssociationParameters(
                    ssid=self.context.router.get_ssid(),
                    security_config=ap_config.security_config)
            self.context.assert_connect_wifi(assoc_params)
            session = netperf_session.NetperfSession(self.context.client,
                                                     self.context.router)
            session.MEASUREMENT_MAX_SAMPLES = 6.


            # Warmup the wifi path and measure signal.
            session.warmup_stations()
            ap_config_tag = ap_config.perf_loggable_description

            for config in self.NETPERF_CONFIGS:
                self.base_through = 0
                self.test_one(session, config, ap_config_tag, 'BT_disconnected')
                with chameleon_audio_helper.bind_widgets(binder):
                    self.test_one(session, config, ap_config_tag,
                                  'BT_connected_but_not_streaming')
                    logging.info('Playing an audio test file')
                    browser_facade = factory.create_browser_facade()
                    browser_facade.new_tab(audio_test_file)
                    self.test_one(session, config, ap_config_tag,
                                  'BT_streaming_audiofile')
                self.test_one(session, config, ap_config_tag,
                              'BT_disconnected_again')

            # Clean up router and client state for the next run.
            self.context.client.shill.disconnect(self.context.router.get_ssid())
            self.context.router.deconfig()

        end_time = time.time()
        logging.info('Running time %0.1f seconds.', end_time - start_time)