dbus/power/power_policy_controller.cc

// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chromeos/dbus/power/power_policy_controller.h"

#include <stdint.h>

#include <algorithm>
#include <memory>
#include <utility>

#include "base/format_macros.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chromeos/dbus/power_manager/backlight.pb.h"

// Avoid some ugly line-wrapping later.
using base::StringAppendF;

namespace chromeos {

namespace {

PowerPolicyController* g_power_policy_controller = nullptr;

// Appends a description of |field|, a field within |delays|, a
// power_manager::PowerManagementPolicy::Delays object, to |str|, an
// std::string, if the field is set.  |name| is a char* describing the
// field.
#define APPEND_DELAY(str, delays, field, name)                   \
  {                                                              \
    if (delays.has_##field())                                    \
      StringAppendF(&str, name "=%" PRId64 " ", delays.field()); \
  }

// Appends descriptions of all of the set delays in |delays|, a
// power_manager::PowerManagementPolicy::Delays object, to |str|, an
// std::string.  |prefix| should be a char* containing either "ac" or
// "battery".
#define APPEND_DELAYS(str, delays, prefix)                                 \
  {                                                                        \
    APPEND_DELAY(str, delays, screen_dim_ms, prefix "_screen_dim_ms");     \
    APPEND_DELAY(str, delays, screen_off_ms, prefix "_screen_off_ms");     \
    APPEND_DELAY(str, delays, screen_lock_ms, prefix "_screen_lock_ms");   \
    APPEND_DELAY(str, delays, idle_warning_ms, prefix "_idle_warning_ms"); \
    APPEND_DELAY(str, delays, idle_ms, prefix "_idle_ms");                 \
  }

// Returns the power_manager::PowerManagementPolicy_Action value
// corresponding to |action|.
power_manager::PowerManagementPolicy_Action GetProtoAction(
    PowerPolicyController::Action action) {
  switch (action) {
    case PowerPolicyController::ACTION_SUSPEND:
      return power_manager::PowerManagementPolicy_Action_SUSPEND;
    case PowerPolicyController::ACTION_STOP_SESSION:
      return power_manager::PowerManagementPolicy_Action_STOP_SESSION;
    case PowerPolicyController::ACTION_SHUT_DOWN:
      return power_manager::PowerManagementPolicy_Action_SHUT_DOWN;
    case PowerPolicyController::ACTION_DO_NOTHING:
      return power_manager::PowerManagementPolicy_Action_DO_NOTHING;
    default:
      NOTREACHED() << "Unhandled action " << action;
      return power_manager::PowerManagementPolicy_Action_DO_NOTHING;
  }
}

// Returns false if |use_audio_activity| and |use_audio_activity| prevent wake
// locks created for |reason| from being honored or true otherwise.
bool IsWakeLockReasonHonored(PowerPolicyController::WakeLockReason reason,
                             bool use_audio_activity,
                             bool use_video_activity) {
  if (reason == PowerPolicyController::REASON_AUDIO_PLAYBACK &&
      !use_audio_activity)
    return false;
  if (reason == PowerPolicyController::REASON_VIDEO_PLAYBACK &&
      !use_video_activity)
    return false;
  return true;
}

// Adjusts |delays| appropriately for backlights having been forced off by
// tapping the power button. The idle delay is shortened to (idle - screen off),
// and the idle warning delay (if set) is shortened to (idle warning - screen
// off). All other delays are cleared, as the display should already be off.
void AdjustDelaysForBacklightsForcedOff(
    power_manager::PowerManagementPolicy::Delays* delays) {
  if (delays->screen_off_ms() <= 0 || delays->idle_ms() <= 0)
    return;

  // The screen-off delay should always be shorter than or equal to the idle
  // delay, but we clamp the value just in case the prefs don't adhere to this.
  // powerd only honors delays that are greater than 0, so use 1 ms as the min.
  const int64_t idle_ms = std::max(delays->idle_ms() - delays->screen_off_ms(),
                                   static_cast<int64_t>(1));
  const int64_t warn_ms =
      delays->idle_warning_ms() > 0
          ? std::max(delays->idle_warning_ms() - delays->screen_off_ms(),
                     static_cast<int64_t>(1))
          : -1;

  delays->Clear();
  delays->set_idle_ms(idle_ms);
  if (warn_ms > 0)
    delays->set_idle_warning_ms(warn_ms);
}

// Saves appropriate value to |week_day| and returns true if there is mapping
// between week day string and enum value.
bool GetWeekDayFromString(
    const std::string& week_day_str,
    power_manager::PowerManagementPolicy::WeekDay* week_day) {
  DCHECK(week_day);
  if (week_day_str == "MONDAY") {
    *week_day = power_manager::PowerManagementPolicy::MONDAY;
  } else if (week_day_str == "TUESDAY") {
    *week_day = power_manager::PowerManagementPolicy::TUESDAY;
  } else if (week_day_str == "WEDNESDAY") {
    *week_day = power_manager::PowerManagementPolicy::WEDNESDAY;
  } else if (week_day_str == "THURSDAY") {
    *week_day = power_manager::PowerManagementPolicy::THURSDAY;
  } else if (week_day_str == "FRIDAY") {
    *week_day = power_manager::PowerManagementPolicy::FRIDAY;
  } else if (week_day_str == "SATURDAY") {
    *week_day = power_manager::PowerManagementPolicy::SATURDAY;
  } else if (week_day_str == "SUNDAY") {
    *week_day = power_manager::PowerManagementPolicy::SUNDAY;
  } else {
    return false;
  }
  return true;
}

}  // namespace

PowerPolicyController::PrefValues::PrefValues() = default;
PowerPolicyController::PrefValues::~PrefValues() = default;

const int PowerPolicyController::kScreenLockAfterOffDelayMs = 10000;  // 10 sec.
const char PowerPolicyController::kPrefsReason[] = "Prefs";

// static
bool PowerPolicyController::GetPeakShiftDayConfigs(
    const base::DictionaryValue& value,
    std::vector<PeakShiftDayConfig>* configs_out) {
  DCHECK(configs_out);
  configs_out->clear();

  const base::Value* entries =
      value.FindKeyOfType({"entries"}, base::Value::Type::LIST);
  if (!entries) {
    return false;
  }

  for (const base::Value& item : entries->GetList()) {
    const base::Value* week_day_value =
        item.FindKeyOfType({"day"}, base::Value::Type::STRING);
    const base::Value* start_time_hour =
        item.FindPathOfType({"start_time", "hour"}, base::Value::Type::INTEGER);
    const base::Value* start_time_minute = item.FindPathOfType(
        {"start_time", "minute"}, base::Value::Type::INTEGER);
    const base::Value* end_time_hour =
        item.FindPathOfType({"end_time", "hour"}, base::Value::Type::INTEGER);
    const base::Value* end_time_minute =
        item.FindPathOfType({"end_time", "minute"}, base::Value::Type::INTEGER);
    const base::Value* charge_start_time_hour = item.FindPathOfType(
        {"charge_start_time", "hour"}, base::Value::Type::INTEGER);
    const base::Value* charge_start_time_minute = item.FindPathOfType(
        {"charge_start_time", "minute"}, base::Value::Type::INTEGER);

    power_manager::PowerManagementPolicy::WeekDay week_day_enum;
    if (!week_day_value ||
        !GetWeekDayFromString(week_day_value->GetString(), &week_day_enum) ||
        !start_time_hour || !start_time_minute || !end_time_hour ||
        !end_time_minute || !charge_start_time_hour ||
        !charge_start_time_minute) {
      return false;
    }

    PeakShiftDayConfig config;
    config.set_day(week_day_enum);
    config.mutable_start_time()->set_hour(start_time_hour->GetInt());
    config.mutable_start_time()->set_minute(start_time_minute->GetInt());
    config.mutable_end_time()->set_hour(end_time_hour->GetInt());
    config.mutable_end_time()->set_minute(end_time_minute->GetInt());
    config.mutable_charge_start_time()->set_hour(
        charge_start_time_hour->GetInt());
    config.mutable_charge_start_time()->set_minute(
        charge_start_time_minute->GetInt());

    configs_out->push_back(std::move(config));
  }

  return true;
}

// static
bool PowerPolicyController::GetAdvancedBatteryChargeModeDayConfigs(
    const base::DictionaryValue& value,
    std::vector<AdvancedBatteryChargeModeDayConfig>* configs_out) {
  DCHECK(configs_out);
  configs_out->clear();

  const base::Value* entries =
      value.FindKeyOfType({"entries"}, base::Value::Type::LIST);
  if (!entries) {
    return false;
  }

  for (const base::Value& item : entries->GetList()) {
    const base::Value* week_day_value =
        item.FindKeyOfType({"day"}, base::Value::Type::STRING);
    const base::Value* charge_start_time_hour = item.FindPathOfType(
        {"charge_start_time", "hour"}, base::Value::Type::INTEGER);
    const base::Value* charge_start_time_minute = item.FindPathOfType(
        {"charge_start_time", "minute"}, base::Value::Type::INTEGER);
    const base::Value* charge_end_time_hour = item.FindPathOfType(
        {"charge_end_time", "hour"}, base::Value::Type::INTEGER);
    const base::Value* charge_end_time_minute = item.FindPathOfType(
        {"charge_end_time", "minute"}, base::Value::Type::INTEGER);

    power_manager::PowerManagementPolicy::WeekDay week_day_enum;
    if (!week_day_value ||
        !GetWeekDayFromString(week_day_value->GetString(), &week_day_enum) ||
        !charge_start_time_hour || !charge_start_time_minute ||
        !charge_end_time_hour || !charge_end_time_minute) {
      return false;
    }

    AdvancedBatteryChargeModeDayConfig config;
    config.set_day(week_day_enum);
    config.mutable_charge_start_time()->set_hour(
        charge_start_time_hour->GetInt());
    config.mutable_charge_start_time()->set_minute(
        charge_start_time_minute->GetInt());
    config.mutable_charge_end_time()->set_hour(charge_end_time_hour->GetInt());
    config.mutable_charge_end_time()->set_minute(
        charge_end_time_minute->GetInt());

    configs_out->push_back(std::move(config));
  }

  return true;
}

// static
bool PowerPolicyController::GetBatteryChargeModeFromInteger(
    int mode,
    power_manager::PowerManagementPolicy::BatteryChargeMode::Mode* mode_out) {
  DCHECK(mode_out);
  switch (mode) {
    case 1:
      *mode_out =
          power_manager::PowerManagementPolicy::BatteryChargeMode::STANDARD;
      return true;
    case 2:
      *mode_out = power_manager::PowerManagementPolicy::BatteryChargeMode::
          EXPRESS_CHARGE;
      return true;
    case 3:
      *mode_out = power_manager::PowerManagementPolicy::BatteryChargeMode::
          PRIMARILY_AC_USE;
      return true;
    case 4:
      *mode_out =
          power_manager::PowerManagementPolicy::BatteryChargeMode::ADAPTIVE;
      return true;
    case 5:
      *mode_out =
          power_manager::PowerManagementPolicy::BatteryChargeMode::CUSTOM;
      return true;
    default:
      return false;
  }
}

// static
std::string PowerPolicyController::GetPolicyDebugString(
    const power_manager::PowerManagementPolicy& policy) {
  std::string str;
  if (policy.has_ac_delays())
    APPEND_DELAYS(str, policy.ac_delays(), "ac");
  if (policy.has_battery_delays())
    APPEND_DELAYS(str, policy.battery_delays(), "battery");
  if (policy.has_ac_idle_action())
    StringAppendF(&str, "ac_idle=%d ", policy.ac_idle_action());
  if (policy.has_battery_idle_action())
    StringAppendF(&str, "battery_idle=%d ", policy.battery_idle_action());
  if (policy.has_lid_closed_action())
    StringAppendF(&str, "lid_closed=%d ", policy.lid_closed_action());
  if (policy.has_screen_wake_lock())
    StringAppendF(&str, "screen_wake_lock=%d ", policy.screen_wake_lock());
  if (policy.has_dim_wake_lock())
    StringAppendF(&str, "dim_wake_lock=%d ", policy.dim_wake_lock());
  if (policy.has_system_wake_lock())
    StringAppendF(&str, "system_wake_lock=%d ", policy.system_wake_lock());
  if (policy.has_use_audio_activity())
    StringAppendF(&str, "use_audio=%d ", policy.use_audio_activity());
  if (policy.has_use_video_activity())
    StringAppendF(&str, "use_video=%d ", policy.use_audio_activity());
  if (policy.has_ac_brightness_percent())
    StringAppendF(&str, "ac_brightness_percent=%f ",
                  policy.ac_brightness_percent());
  if (policy.has_battery_brightness_percent()) {
    StringAppendF(&str, "battery_brightness_percent=%f ",
                  policy.battery_brightness_percent());
  }
  if (policy.has_presentation_screen_dim_delay_factor()) {
    StringAppendF(&str, "presentation_screen_dim_delay_factor=%f ",
                  policy.presentation_screen_dim_delay_factor());
  }
  if (policy.has_user_activity_screen_dim_delay_factor()) {
    StringAppendF(&str, "user_activity_screen_dim_delay_factor=%f ",
                  policy.user_activity_screen_dim_delay_factor());
  }
  if (policy.has_wait_for_initial_user_activity()) {
    StringAppendF(&str, "wait_for_initial_user_activity=%d ",
                  policy.wait_for_initial_user_activity());
  }
  if (policy.has_force_nonzero_brightness_for_user_activity()) {
    StringAppendF(&str, "force_nonzero_brightness_for_user_activity=%d ",
                  policy.force_nonzero_brightness_for_user_activity());
  }

  str += GetPeakShiftPolicyDebugString(policy);

  str += GetAdvancedBatteryChargeModePolicyDebugString(policy);

  if (policy.has_battery_charge_mode()) {
    if (policy.battery_charge_mode().has_mode()) {
      StringAppendF(&str, "battery_charge_mode=%d ",
                    policy.battery_charge_mode().mode());
    }
    if (policy.battery_charge_mode().has_custom_charge_start()) {
      StringAppendF(&str, "custom_charge_start=%d ",
                    policy.battery_charge_mode().custom_charge_start());
    }
    if (policy.battery_charge_mode().has_custom_charge_stop()) {
      StringAppendF(&str, "custom_charge_stop=%d ",
                    policy.battery_charge_mode().custom_charge_stop());
    }
  }

  if (policy.has_boot_on_ac()) {
    StringAppendF(&str, "boot_on_ac=%d ", policy.boot_on_ac());
  }

  if (policy.has_usb_power_share()) {
    StringAppendF(&str, "usb_power_share=%d ", policy.usb_power_share());
  }

  if (policy.has_reason())
    StringAppendF(&str, "reason=\"%s\" ", policy.reason().c_str());
  base::TrimWhitespaceASCII(str, base::TRIM_TRAILING, &str);
  return str;
}

// static
std::string PowerPolicyController::GetPeakShiftPolicyDebugString(
    const power_manager::PowerManagementPolicy& policy) {
  std::string str;
  if (policy.has_peak_shift_battery_percent_threshold()) {
    StringAppendF(&str, "peak_shift_battery_threshold=%d ",
                  policy.peak_shift_battery_percent_threshold());
  }
  if (policy.peak_shift_day_configs_size() == 0) {
    return str;
  }

  std::vector<std::string> list;
  for (auto config : policy.peak_shift_day_configs()) {
    list.push_back(base::StringPrintf(
        "{day=%d start_time=%d:%02d end_time=%d:%02d "
        "charge_start_time=%d:%02d}",
        config.day(), config.start_time().hour(), config.start_time().minute(),
        config.end_time().hour(), config.end_time().minute(),
        config.charge_start_time().hour(),
        config.charge_start_time().minute()));
  }
  StringAppendF(&str, "peak_shift_day_config=[%s] ",
                base::JoinString(list, " ").c_str());
  return str;
}

// static
std::string
PowerPolicyController::GetAdvancedBatteryChargeModePolicyDebugString(
    const power_manager::PowerManagementPolicy& policy) {
  if (policy.advanced_battery_charge_mode_day_configs_size() == 0) {
    return "";
  }

  std::vector<std::string> list;
  for (auto config : policy.advanced_battery_charge_mode_day_configs()) {
    list.push_back(base::StringPrintf(
        "{day=%d charge_start_time=%d:%02d charge_end_time=%d:%02d}",
        config.day(), config.charge_start_time().hour(),
        config.charge_start_time().minute(), config.charge_end_time().hour(),
        config.charge_end_time().minute()));
  }
  return base::StringPrintf("advanced_battery_charge_mode_day_config=[%s] ",
                            base::JoinString(list, " ").c_str());
}

// static
void PowerPolicyController::Initialize(PowerManagerClient* client) {
  DCHECK(!IsInitialized());
  g_power_policy_controller = new PowerPolicyController(client);
}

// static
bool PowerPolicyController::IsInitialized() {
  return g_power_policy_controller;
}

// static
void PowerPolicyController::Shutdown() {
  DCHECK(IsInitialized());
  delete g_power_policy_controller;
  g_power_policy_controller = nullptr;
}

// static
PowerPolicyController* PowerPolicyController::Get() {
  DCHECK(IsInitialized());
  return g_power_policy_controller;
}

void PowerPolicyController::ApplyPrefs(const PrefValues& values) {
  prefs_policy_.Clear();

  power_manager::PowerManagementPolicy::Delays* delays =
      prefs_policy_.mutable_ac_delays();
  delays->set_screen_dim_ms(values.ac_screen_dim_delay_ms);
  delays->set_screen_off_ms(values.ac_screen_off_delay_ms);
  delays->set_screen_lock_ms(values.ac_screen_lock_delay_ms);
  delays->set_idle_warning_ms(values.ac_idle_warning_delay_ms);
  delays->set_idle_ms(values.ac_idle_delay_ms);

  // If auto screen-locking is enabled, ensure that the screen is locked soon
  // after it's turned off due to user inactivity.
  int64_t lock_ms = delays->screen_off_ms() + kScreenLockAfterOffDelayMs;
  if (values.enable_auto_screen_lock && delays->screen_off_ms() > 0 &&
      (delays->screen_lock_ms() <= 0 || lock_ms < delays->screen_lock_ms()) &&
      lock_ms < delays->idle_ms()) {
    delays->set_screen_lock_ms(lock_ms);
  }

  delays = prefs_policy_.mutable_battery_delays();
  delays->set_screen_dim_ms(values.battery_screen_dim_delay_ms);
  delays->set_screen_off_ms(values.battery_screen_off_delay_ms);
  delays->set_screen_lock_ms(values.battery_screen_lock_delay_ms);
  delays->set_idle_warning_ms(values.battery_idle_warning_delay_ms);
  delays->set_idle_ms(values.battery_idle_delay_ms);

  lock_ms = delays->screen_off_ms() + kScreenLockAfterOffDelayMs;
  if (values.enable_auto_screen_lock && delays->screen_off_ms() > 0 &&
      (delays->screen_lock_ms() <= 0 || lock_ms < delays->screen_lock_ms()) &&
      lock_ms < delays->idle_ms()) {
    delays->set_screen_lock_ms(lock_ms);
  }
  auto_screen_lock_enabled_ = values.enable_auto_screen_lock;

  prefs_policy_.set_ac_idle_action(GetProtoAction(values.ac_idle_action));
  prefs_policy_.set_battery_idle_action(
      GetProtoAction(values.battery_idle_action));
  prefs_policy_.set_lid_closed_action(GetProtoAction(values.lid_closed_action));
  prefs_policy_.set_use_audio_activity(values.use_audio_activity);
  prefs_policy_.set_use_video_activity(values.use_video_activity);

  if (!per_session_brightness_override_) {
    if (values.ac_brightness_percent >= 0.0)
      prefs_policy_.set_ac_brightness_percent(values.ac_brightness_percent);
    if (values.battery_brightness_percent >= 0.0) {
      prefs_policy_.set_battery_brightness_percent(
          values.battery_brightness_percent);
    }
  }

  prefs_policy_.set_presentation_screen_dim_delay_factor(
      values.presentation_screen_dim_delay_factor);
  prefs_policy_.set_user_activity_screen_dim_delay_factor(
      values.user_activity_screen_dim_delay_factor);

  prefs_policy_.set_wait_for_initial_user_activity(
      values.wait_for_initial_user_activity);
  prefs_policy_.set_force_nonzero_brightness_for_user_activity(
      values.force_nonzero_brightness_for_user_activity);

  honor_wake_locks_ = values.allow_wake_locks;
  honor_screen_wake_locks_ =
      honor_wake_locks_ && values.allow_screen_wake_locks;

  fast_suspend_when_backlights_forced_off_ =
      values.fast_suspend_when_backlights_forced_off;

  if (values.peak_shift_enabled) {
    prefs_policy_.set_peak_shift_battery_percent_threshold(
        values.peak_shift_battery_threshold);
    *prefs_policy_.mutable_peak_shift_day_configs() = {
        values.peak_shift_day_configs.begin(),
        values.peak_shift_day_configs.end()};
  }

  if (values.advanced_battery_charge_mode_enabled) {
    *prefs_policy_.mutable_advanced_battery_charge_mode_day_configs() = {
        values.advanced_battery_charge_mode_day_configs.begin(),
        values.advanced_battery_charge_mode_day_configs.end()};
  }

  auto* battery_charge_mode = prefs_policy_.mutable_battery_charge_mode();
  battery_charge_mode->set_mode(values.battery_charge_mode);
  if (values.battery_charge_mode ==
      power_manager::PowerManagementPolicy::BatteryChargeMode::CUSTOM) {
    battery_charge_mode->set_custom_charge_start(values.custom_charge_start);
    battery_charge_mode->set_custom_charge_stop(values.custom_charge_stop);
  }

  prefs_policy_.set_boot_on_ac(values.boot_on_ac);

  prefs_policy_.set_usb_power_share(values.usb_power_share);

  prefs_were_set_ = true;
  SendCurrentPolicy();
}

base::TimeDelta PowerPolicyController::GetMaxPolicyAutoScreenLockDelay() {
  if (!prefs_were_set_ || !auto_screen_lock_enabled_) {
    return base::TimeDelta();
  }
  int ac_delay = prefs_policy_.ac_delays().screen_lock_ms();
  int battery_delay = prefs_policy_.battery_delays().screen_lock_ms();
  return base::TimeDelta::FromMilliseconds(std::max(ac_delay, battery_delay));
}

int PowerPolicyController::AddScreenWakeLock(WakeLockReason reason,
                                             const std::string& description) {
  return AddWakeLockInternal(WakeLock::TYPE_SCREEN, reason, description);
}

int PowerPolicyController::AddDimWakeLock(WakeLockReason reason,
                                          const std::string& description) {
  return AddWakeLockInternal(WakeLock::TYPE_DIM, reason, description);
}

int PowerPolicyController::AddSystemWakeLock(WakeLockReason reason,
                                             const std::string& description) {
  return AddWakeLockInternal(WakeLock::TYPE_SYSTEM, reason, description);
}

void PowerPolicyController::RemoveWakeLock(int id) {
  if (!wake_locks_.erase(id))
    LOG(WARNING) << "Ignoring request to remove nonexistent wake lock " << id;
  else
    SendCurrentPolicy();
}

void PowerPolicyController::PowerManagerRestarted() {
  SendCurrentPolicy();
}

void PowerPolicyController::ScreenBrightnessChanged(
    const power_manager::BacklightBrightnessChange& change) {
  if (prefs_were_set_ &&
      (prefs_policy_.has_ac_brightness_percent() ||
       prefs_policy_.has_battery_brightness_percent()) &&
      change.cause() ==
          power_manager::BacklightBrightnessChange_Cause_USER_REQUEST) {
    per_session_brightness_override_ = true;
  }
}

void PowerPolicyController::NotifyChromeIsExiting() {
  if (chrome_is_exiting_)
    return;
  chrome_is_exiting_ = true;
  SendCurrentPolicy();
}

void PowerPolicyController::HandleBacklightsForcedOffForPowerButton(
    bool forced_off) {
  if (forced_off == backlights_forced_off_for_power_button_)
    return;
  backlights_forced_off_for_power_button_ = forced_off;
  SendCurrentPolicy();
}

void PowerPolicyController::SetEncryptionMigrationActive(bool active) {
  if (encryption_migration_active_ == active)
    return;

  encryption_migration_active_ = active;
  SendCurrentPolicy();
}

PowerPolicyController::PowerPolicyController(PowerManagerClient* client)
    : client_(client) {
  DCHECK(client_);
  client_->AddObserver(this);
}

PowerPolicyController::~PowerPolicyController() {
  client_->RemoveObserver(this);
}

PowerPolicyController::WakeLock::WakeLock(Type type,
                                          WakeLockReason reason,
                                          const std::string& description)
    : type(type), reason(reason), description(description) {}

PowerPolicyController::WakeLock::~WakeLock() = default;

int PowerPolicyController::AddWakeLockInternal(WakeLock::Type type,
                                               WakeLockReason reason,
                                               const std::string& description) {
  const int id = next_wake_lock_id_++;
  wake_locks_.insert(std::make_pair(id, WakeLock(type, reason, description)));
  SendCurrentPolicy();
  return id;
}

void PowerPolicyController::SendCurrentPolicy() {
  std::string causes;

  power_manager::PowerManagementPolicy policy = prefs_policy_;
  if (prefs_were_set_)
    causes = kPrefsReason;

  // Shorten suspend delays if the backlight is forced off via the power button.
  if (backlights_forced_off_for_power_button_ &&
      fast_suspend_when_backlights_forced_off_) {
    if (policy.ac_idle_action() ==
        power_manager::PowerManagementPolicy_Action_SUSPEND) {
      AdjustDelaysForBacklightsForcedOff(policy.mutable_ac_delays());
    }
    if (policy.battery_idle_action() ==
        power_manager::PowerManagementPolicy_Action_SUSPEND) {
      AdjustDelaysForBacklightsForcedOff(policy.mutable_battery_delays());
    }
  }

  if (honor_wake_locks_) {
    bool have_screen_wake_locks = false;
    bool have_dim_wake_locks = false;
    bool have_system_wake_locks = false;
    for (const auto& it : wake_locks_) {
      // Skip audio and video locks that should be ignored due to policy.
      if (!IsWakeLockReasonHonored(it.second.reason,
                                   policy.use_audio_activity(),
                                   policy.use_video_activity()))
        continue;

      switch (it.second.type) {
        case WakeLock::TYPE_SCREEN:
          have_screen_wake_locks = true;
          break;
        case WakeLock::TYPE_DIM:
          have_dim_wake_locks = true;
          break;
        case WakeLock::TYPE_SYSTEM:
          have_system_wake_locks = true;
          break;
      }
      causes += (causes.empty() ? "" : ", ") + it.second.description;
    }

    // Downgrade full-brightness and dimmed-brightness locks to system locks if
    // wake locks aren't allowed to keep the screen on.
    if (!honor_screen_wake_locks_ &&
        (have_screen_wake_locks || have_dim_wake_locks)) {
      have_system_wake_locks = true;
      have_screen_wake_locks = false;
      have_dim_wake_locks = false;
    }

    if (have_screen_wake_locks)
      policy.set_screen_wake_lock(true);
    if (have_dim_wake_locks)
      policy.set_dim_wake_lock(true);
    if (have_system_wake_locks)
      policy.set_system_wake_lock(true);
  }

  if (encryption_migration_active_ &&
      policy.lid_closed_action() !=
          power_manager::PowerManagementPolicy_Action_DO_NOTHING) {
    policy.set_lid_closed_action(
        power_manager::PowerManagementPolicy_Action_SUSPEND);
    causes +=
        std::string((causes.empty() ? "" : ", ")) + "encryption migration";
  }

  // To avoid a race in the case where the user asks Chrome to sign out
  // and then immediately closes the lid, override the lid-closed action
  // so the system will stay awake while Chrome is exiting. When Chrome
  // restarts to display the login screen, it will send an updated
  // policy that powerd can act on.
  if (chrome_is_exiting_ &&
      (!policy.has_lid_closed_action() ||
       policy.lid_closed_action() ==
           power_manager::PowerManagementPolicy_Action_SUSPEND ||
       policy.lid_closed_action() ==
           power_manager::PowerManagementPolicy_Action_SHUT_DOWN)) {
    policy.set_lid_closed_action(
        power_manager::PowerManagementPolicy_Action_DO_NOTHING);
  }

  if (!causes.empty())
    policy.set_reason(causes);
  client_->SetPolicy(policy);
}

}  // namespace chromeos