# Copyright 2018 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.bin import test
from autotest_lib.client.common_lib import error
from autotest_lib.client.cros import service_stopper
from autotest_lib.client.cros.power import power_dashboard
from autotest_lib.client.cros.power import power_rapl
from autotest_lib.client.cros.power import power_status
from autotest_lib.client.cros.power import power_telemetry_utils
from autotest_lib.client.cros.power import power_utils


class power_Test(test.test):
    """Optional base class power related tests."""
    version = 1

    def initialize(self, seconds_period=20., pdash_note='',
                   force_discharge=False):
        """Perform necessary initialization prior to power test run.

        @param seconds_period: float of probing interval in seconds.
        @param pdash_note: note of the current run to send to power dashboard.
        @param force_discharge: force battery to discharge during the test.

        @var backlight: power_utils.Backlight object.
        @var keyvals: dictionary of result keyvals.
        @var status: power_status.SysStat object.

        @var _checkpoint_logger: power_status.CheckpointLogger to track
                                 checkpoint data.
        @var _plog: power_status.PowerLogger object to monitor power.
        @var _psr: power_utils.DisplayPanelSelfRefresh object to monitor PSR.
        @var _services: service_stopper.ServiceStopper object.
        @var _start_time: float of time in seconds since Epoch test started.
        @var _stats: power_status.StatoMatic object.
        @var _tlog: power_status.TempLogger object to monitor temperatures.
        @var _clog: power_status.CPUStatsLogger object to monitor CPU(s)
                    frequencies and c-states.
        @var _meas_logs: list of power_status.MeasurementLoggers
        """
        super(power_Test, self).initialize()
        self.backlight = power_utils.Backlight()
        self.backlight.set_default()
        self.keyvals = dict()
        self.status = power_status.get_status()

        self._checkpoint_logger = power_status.CheckpointLogger()
        self._seconds_period = seconds_period

        measurements = []

        self._force_discharge = force_discharge
        if force_discharge:
            if not self.status.battery:
                raise error.TestNAError('DUT does not have battery. '
                                        'Could not force discharge.')
            if not power_utils.charge_control_by_ectool(False):
                raise error.TestError('Could not run battery force discharge.')

        if force_discharge or not self.status.on_ac():
            measurements.append(
                power_status.SystemPower(self.status.battery_path))
        if power_utils.has_powercap_support():
            measurements += power_rapl.create_powercap()
        elif power_utils.has_rapl_support():
            measurements += power_rapl.create_rapl()
        self._plog = power_status.PowerLogger(measurements,
                seconds_period=seconds_period,
                checkpoint_logger=self._checkpoint_logger)
        self._psr = power_utils.DisplayPanelSelfRefresh()
        self._services = service_stopper.ServiceStopper(
                service_stopper.ServiceStopper.POWER_DRAW_SERVICES)
        self._services.stop_services()
        self._stats = power_status.StatoMatic()

        self._tlog = power_status.TempLogger([],
                seconds_period=seconds_period,
                checkpoint_logger=self._checkpoint_logger)
        self._clog = power_status.CPUStatsLogger(seconds_period=seconds_period,
                checkpoint_logger=self._checkpoint_logger)

        self._meas_logs = [self._plog, self._tlog, self._clog]

        self._pdash_note = pdash_note

    def warmup(self, warmup_time=30):
        """Warm up.

        Wait between initialization and run_once for new settings to stabilize.

        @param warmup_time: integer of seconds to warmup.
        """
        time.sleep(warmup_time)

    def start_measurements(self):
        """Start measurements."""
        for log in self._meas_logs:
            log.start()
        self._start_time = time.time()
        if self.status.battery:
            self._start_energy = self.status.battery.energy
        power_telemetry_utils.start_measurement()

    def loop_sleep(self, loop, sleep_secs):
        """Jitter free sleep.

        @param loop: integer of loop (1st is zero).
        @param sleep_secs: integer of desired sleep seconds.
        """
        next_time = self._start_time + (loop + 1) * sleep_secs
        time.sleep(next_time - time.time())

    def checkpoint_measurements(self, name, start_time=None):
        """Checkpoint measurements.

        @param name: string name of measurement being checkpointed.
        @param start_time: float of time in seconds since Epoch that
                measurements being checkpointed began.
        """
        if not start_time:
            start_time = self._start_time
        self.status.refresh()
        self._checkpoint_logger.checkpoint(name, start_time)
        self._psr.refresh()

    def publish_keyvals(self):
        """Publish power result keyvals."""
        keyvals = self._stats.publish()
        keyvals['level_backlight_max'] = self.backlight.get_max_level()
        keyvals['level_backlight_current'] = self.backlight.get_level()

        # record battery stats if not on AC
        if self.status.on_ac():
            keyvals['b_on_ac'] = 1
        else:
            keyvals['b_on_ac'] = 0

        if self.status.battery:
            keyvals['ah_charge_full'] = self.status.battery.charge_full
            keyvals['ah_charge_full_design'] = \
                                self.status.battery.charge_full_design
            keyvals['ah_charge_now'] = self.status.battery.charge_now
            keyvals['a_current_now'] = self.status.battery.current_now
            keyvals['wh_energy'] = self.status.battery.energy
            energy_used = self._start_energy - self.status.battery.energy
            runtime_minutes = (time.time() - self._start_time) / 60.
            keyvals['wh_energy_used'] = energy_used
            keyvals['minutes_tested'] = runtime_minutes
            if energy_used > 0 and runtime_minutes > 1:
                keyvals['w_energy_rate'] = energy_used * 60 / runtime_minutes
            keyvals['v_voltage_min_design'] = \
                                self.status.battery.voltage_min_design
            keyvals['v_voltage_now'] = self.status.battery.voltage_now

        for log in self._meas_logs:
            keyvals.update(log.calc())
        keyvals.update(self._psr.get_keyvals())

        self.keyvals.update(keyvals)

        core_keyvals = power_utils.get_core_keyvals(self.keyvals)
        self.write_perf_keyval(core_keyvals)

    def publish_dashboard(self):
        """Report results to chromeperf & power dashboard."""

        self.publish_keyvals()

        # publish power values
        for key, values in self.keyvals.iteritems():
            if key.endswith('pwr_avg'):
                self.output_perf_value(description=key, value=values, units='W',
                                   higher_is_better=False, graph='power')

        # publish temperature values
        for key, values in self.keyvals.iteritems():
            if key.endswith('temp_avg'):
                self.output_perf_value(description=key, value=values, units='C',
                                   higher_is_better=False, graph='temperature')

        # publish to power dashboard
        pdash = power_dashboard.PowerLoggerDashboard(
            self._plog, self.tagged_testname, self.resultsdir,
            note=self._pdash_note)
        pdash.upload()
        cdash = power_dashboard.CPUStatsLoggerDashboard(
            self._clog, self.tagged_testname, self.resultsdir,
            note=self._pdash_note)
        cdash.upload()
        tdash = power_dashboard.TempLoggerDashboard(
            self._tlog, self.tagged_testname, self.resultsdir,
            note=self._pdash_note)
        tdash.upload()

    def _save_results(self):
        """Save results of each logger in resultsdir."""
        for log in self._meas_logs:
            log.save_results(self.resultsdir)
        self._checkpoint_logger.save_checkpoint_data(self.resultsdir)

    def postprocess_iteration(self):
        """Write keyval and send data to dashboard."""
        power_telemetry_utils.end_measurement()
        for log in self._meas_logs:
            log.done = True
        super(power_Test, self).postprocess_iteration()
        self.publish_dashboard()
        self._save_results()

    def cleanup(self):
        """Reverse setting change in initialization."""
        if self._force_discharge:
            if not power_utils.charge_control_by_ectool(True):
                logging.warn('Can not restore from force discharge.')
        if self.backlight:
            self.backlight.restore()
        self._services.restore_services()
        super(power_Test, self).cleanup()