text: // Copyright 2014 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 "chrome/browser/ui/webui/chromeos/set_time_ui.h"
  
  #include "base/bind.h"
  #include "base/bind_helpers.h"
  #include "base/build_time.h"
  #include "base/values.h"
  #include "chrome/browser/chromeos/settings/cros_settings.h"
  #include "chrome/browser/chromeos/system/timezone_util.h"
  #include "chrome/browser/profiles/profile.h"
  #include "chrome/common/url_constants.h"
  #include "chrome/grit/generated_resources.h"
  #include "chromeos/dbus/dbus_thread_manager.h"
  #include "chromeos/dbus/system_clock_client.h"
  #include "chromeos/login/login_state.h"
  #include "chromeos/settings/timezone_settings.h"
  #include "content/public/browser/web_ui.h"
  #include "content/public/browser/web_ui_data_source.h"
  #include "content/public/browser/web_ui_message_handler.h"
  #include "grit/browser_resources.h"
  
  namespace chromeos {
  
  namespace {
  
  class SetTimeMessageHandler : public content::WebUIMessageHandler,
                                public chromeos::SystemClockClient::Observer,
                                public system::TimezoneSettings::Observer {
   public:
    SetTimeMessageHandler() {
      system::TimezoneSettings::GetInstance()->AddObserver(this);
      chromeos::DBusThreadManager::Get()->GetSystemClockClient()->AddObserver(
          this);
    }
  
    ~SetTimeMessageHandler() override {
      system::TimezoneSettings::GetInstance()->RemoveObserver(this);
      chromeos::DBusThreadManager::Get()->GetSystemClockClient()->RemoveObserver(
          this);
    }
  
    // WebUIMessageHandler:
    void RegisterMessages() override {
      web_ui()->RegisterMessageCallback(
          "setTimeInSeconds",
          base::Bind(&SetTimeMessageHandler::OnSetTime, base::Unretained(this)));
      web_ui()->RegisterMessageCallback(
          "setTimezone",
          base::Bind(&SetTimeMessageHandler::OnSetTimezone,
                     base::Unretained(this)));
    }
  
   private:
    // system::SystemClockClient::Observer:
    void SystemClockUpdated() override {
      web_ui()->CallJavascriptFunction("settime.TimeSetter.updateTime");
    }
  
    // system::TimezoneSettings::Observer:
    void TimezoneChanged(const icu::TimeZone& timezone) override {
      base::StringValue timezone_id(
          system::TimezoneSettings::GetTimezoneID(timezone));
      web_ui()->CallJavascriptFunction("settime.TimeSetter.setTimezone",
                                       timezone_id);
    }
  
    // Handler for Javascript call to set the system clock when the user sets a
    // new time. Expects the time as the number of seconds since the Unix
    // epoch, treated as a double.
    void OnSetTime(const base::ListValue* args) {
      double seconds;
      if (!args->GetDouble(0, &seconds)) {
        NOTREACHED();
        return;
      }
  
      chromeos::DBusThreadManager::Get()->GetSystemClockClient()->SetTime(
          static_cast<int64>(seconds));
    }
  
    // Handler for Javascript call to change the system time zone when the user
    // selects a new time zone. Expects the time zone ID as a string, as it
    // appears in the time zone option values.
    void OnSetTimezone(const base::ListValue* args) {
      std::string timezone_id;
      if (!args->GetString(0, &timezone_id)) {
        NOTREACHED();
        return;
      }
  
      CrosSettings::Get()->SetString(kSystemTimezone, timezone_id);
    }
  
    DISALLOW_COPY_AND_ASSIGN(SetTimeMessageHandler);
  };
  
  }  // namespace
  
  SetTimeUI::SetTimeUI(content::WebUI* web_ui) : WebDialogUI(web_ui) {
    web_ui->AddMessageHandler(new SetTimeMessageHandler());
  
    // Set up the chrome://set-time source.
    content::WebUIDataSource* source =
        content::WebUIDataSource::Create(chrome::kChromeUISetTimeHost);
  
    source->AddLocalizedString("setTimeTitle", IDS_SET_TIME_TITLE);
    source->AddLocalizedString("prompt", IDS_SET_TIME_PROMPT);
    source->AddLocalizedString("doneButton", IDS_SET_TIME_BUTTON_CLOSE);
    source->AddLocalizedString("timezone",
                               IDS_OPTIONS_SETTINGS_TIMEZONE_DESCRIPTION);
    source->AddLocalizedString("dateLabel", IDS_SET_TIME_DATE_LABEL);
    source->AddLocalizedString("timeLabel", IDS_SET_TIME_TIME_LABEL);
  
    base::DictionaryValue values;
    values.Set("timezoneList", chromeos::system::GetTimezoneList().release());
  
    // If we are not logged in, we need to show the time zone dropdown.
    // Otherwise, we can leave |currentTimezoneId| blank.
    std::string current_timezone_id;
    if (!LoginState::Get()->IsUserLoggedIn())
      CrosSettings::Get()->GetString(kSystemTimezone, &current_timezone_id);
    values.SetString("currentTimezoneId", current_timezone_id);
    values.SetDouble("buildTime", base::GetBuildTime().ToJsTime());
  
    source->AddLocalizedStrings(values);
    source->SetJsonPath("strings.js");
  
    source->AddResourcePath("set_time.css", IDR_SET_TIME_CSS);
    source->AddResourcePath("set_time.js", IDR_SET_TIME_JS);
    source->SetDefaultResource(IDR_SET_TIME_HTML);
  
    content::WebUIDataSource::Add(Profile::FromWebUI(web_ui), source);
  }
  
  SetTimeUI::~SetTimeUI() {
  }
  
  }  // namespace chromeos
  