// 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_policy_controller.h"

#include "base/format_macros.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chromeos/dbus/dbus_thread_manager.h"

namespace chromeos {

namespace {

// 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())                                                \
        str += base::StringPrintf(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;
  }
}

}  // namespace

const int PowerPolicyController::kScreenLockAfterOffDelayMs = 10000;  // 10 sec.

// -1 is interpreted as "unset" by powerd, resulting in powerd's default
// delays being used instead.  There are no similarly-interpreted values
// for the other fields, unfortunately (but the constructor-assigned values
// will only reach powerd if Chrome messes up and forgets to override them
// with the pref-assigned values).
PowerPolicyController::PrefValues::PrefValues()
    : ac_screen_dim_delay_ms(-1),
      ac_screen_off_delay_ms(-1),
      ac_screen_lock_delay_ms(-1),
      ac_idle_warning_delay_ms(-1),
      ac_idle_delay_ms(-1),
      battery_screen_dim_delay_ms(-1),
      battery_screen_off_delay_ms(-1),
      battery_screen_lock_delay_ms(-1),
      battery_idle_warning_delay_ms(-1),
      battery_idle_delay_ms(-1),
      ac_idle_action(ACTION_SUSPEND),
      battery_idle_action(ACTION_SUSPEND),
      lid_closed_action(ACTION_SUSPEND),
      use_audio_activity(true),
      use_video_activity(true),
      allow_screen_wake_locks(true),
      enable_screen_lock(false),
      presentation_screen_dim_delay_factor(1.0),
      user_activity_screen_dim_delay_factor(1.0) {}

// 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())
    str += base::StringPrintf("ac_idle=%d ", policy.ac_idle_action());
  if (policy.has_battery_idle_action())
    str += base::StringPrintf("battery_idle=%d ", policy.battery_idle_action());
  if (policy.has_lid_closed_action())
    str += base::StringPrintf("lid_closed=%d ", policy.lid_closed_action());
  if (policy.has_use_audio_activity())
    str += base::StringPrintf("use_audio=%d ", policy.use_audio_activity());
  if (policy.has_use_video_activity())
    str += base::StringPrintf("use_video=%d ", policy.use_audio_activity());
  if (policy.has_presentation_screen_dim_delay_factor()) {
    str += base::StringPrintf("presentation_screen_dim_delay_factor=%f ",
        policy.presentation_screen_dim_delay_factor());
  }
  if (policy.has_user_activity_screen_dim_delay_factor()) {
    str += base::StringPrintf("user_activity_screen_dim_delay_factor=%f ",
        policy.user_activity_screen_dim_delay_factor());
  }
  if (policy.has_reason())
    str += base::StringPrintf("reason=\"%s\" ", policy.reason().c_str());
  TrimWhitespace(str, TRIM_TRAILING, &str);
  return str;
}

PowerPolicyController::PowerPolicyController(DBusThreadManager* manager,
                                             PowerManagerClient* client)
    : manager_(manager),
      client_(client),
      prefs_were_set_(false),
      honor_screen_wake_locks_(true),
      next_wake_lock_id_(1) {
  manager_->AddObserver(this);
  client_->AddObserver(this);
  SendCurrentPolicy();
}

PowerPolicyController::~PowerPolicyController() {
  // The power manager's policy is reset before this point, in
  // OnDBusThreadManagerDestroying().  At the time that
  // PowerPolicyController is destroyed, PowerManagerClient's D-Bus proxy
  // to the power manager is already gone.
  client_->RemoveObserver(this);
  client_ = NULL;
  manager_->RemoveObserver(this);
  manager_ = NULL;
}

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 screen-locking is enabled, ensure that the screen is locked soon
  // after it's turned off due to user inactivity.
  int64 lock_ms = delays->screen_off_ms() + kScreenLockAfterOffDelayMs;
  if (values.enable_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_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);
  }

  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);
  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);

  honor_screen_wake_locks_ = values.allow_screen_wake_locks;

  prefs_were_set_ = true;
  SendCurrentPolicy();
}

void PowerPolicyController::ClearPrefs() {
  prefs_policy_.Clear();
  honor_screen_wake_locks_ = true;
  prefs_were_set_ = false;
  SendCurrentPolicy();
}

int PowerPolicyController::AddScreenWakeLock(const std::string& reason) {
  int id = next_wake_lock_id_++;
  screen_wake_locks_[id] = reason;
  SendCurrentPolicy();
  return id;
}

int PowerPolicyController::AddSystemWakeLock(const std::string& reason) {
  int id = next_wake_lock_id_++;
  system_wake_locks_[id] = reason;
  SendCurrentPolicy();
  return id;
}

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

void PowerPolicyController::OnDBusThreadManagerDestroying(
    DBusThreadManager* manager) {
  DCHECK_EQ(manager, manager_);
  SendEmptyPolicy();
}

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

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

  power_manager::PowerManagementPolicy policy = prefs_policy_;
  if (prefs_were_set_)
    reason = "Prefs";

  if (honor_screen_wake_locks_ && !screen_wake_locks_.empty()) {
    policy.mutable_ac_delays()->set_screen_dim_ms(0);
    policy.mutable_ac_delays()->set_screen_off_ms(0);
    policy.mutable_ac_delays()->set_screen_lock_ms(0);
    policy.mutable_battery_delays()->set_screen_dim_ms(0);
    policy.mutable_battery_delays()->set_screen_off_ms(0);
    policy.mutable_battery_delays()->set_screen_lock_ms(0);
  }

  if (!screen_wake_locks_.empty() || !system_wake_locks_.empty()) {
    if (!policy.has_ac_idle_action() || policy.ac_idle_action() ==
        power_manager::PowerManagementPolicy_Action_SUSPEND) {
      policy.set_ac_idle_action(
          power_manager::PowerManagementPolicy_Action_DO_NOTHING);
    }
    if (!policy.has_battery_idle_action() || policy.battery_idle_action() ==
        power_manager::PowerManagementPolicy_Action_SUSPEND) {
      policy.set_battery_idle_action(
          power_manager::PowerManagementPolicy_Action_DO_NOTHING);
    }
  }

  for (WakeLockMap::const_iterator it = screen_wake_locks_.begin();
       it != screen_wake_locks_.end(); ++it) {
    reason += (reason.empty() ? "" : ", ") + it->second;
  }
  for (WakeLockMap::const_iterator it = system_wake_locks_.begin();
       it != system_wake_locks_.end(); ++it) {
    reason += (reason.empty() ? "" : ", ") + it->second;
  }

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

void PowerPolicyController::SendEmptyPolicy() {
  client_->SetPolicy(power_manager::PowerManagementPolicy());
}

}  // namespace chromeos