text: // Copyright (c) 2012 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/options/language_options_handler.h"
  
  #include <map>
  #include <string>
  #include <utility>
  #include <vector>
  
  #include "base/basictypes.h"
  #include "base/bind.h"
  #include "base/command_line.h"
  #include "base/i18n/rtl.h"
  #include "base/prefs/pref_service.h"
  #include "base/strings/utf_string_conversions.h"
  #include "base/values.h"
  #include "chrome/browser/browser_process.h"
  #include "chrome/browser/lifetime/application_lifetime.h"
  #include "chrome/common/chrome_switches.h"
  #include "chrome/common/pref_names.h"
  #include "content/public/browser/user_metrics.h"
  #include "content/public/browser/web_ui.h"
  #include "grit/chromium_strings.h"
  #include "grit/generated_resources.h"
  #include "ui/base/l10n/l10n_util.h"
  
  using base::UserMetricsAction;
  
  namespace options {
  
  LanguageOptionsHandler::LanguageOptionsHandler() {
  }
  
  LanguageOptionsHandler::~LanguageOptionsHandler() {
  }
  
  void LanguageOptionsHandler::GetLocalizedValues(
      base::DictionaryValue* localized_strings) {
    LanguageOptionsHandlerCommon::GetLocalizedValues(localized_strings);
  
    RegisterTitle(localized_strings, "languagePage",
                  IDS_OPTIONS_SETTINGS_LANGUAGES_DIALOG_TITLE);
    localized_strings->SetString("restart_button",
        l10n_util::GetStringUTF16(
            IDS_OPTIONS_SETTINGS_LANGUAGES_RELAUNCH_BUTTON));
    localized_strings->Set("languageList", GetLanguageList());
  }
  
  void LanguageOptionsHandler::RegisterMessages() {
    LanguageOptionsHandlerCommon::RegisterMessages();
  
    web_ui()->RegisterMessageCallback("uiLanguageRestart",
        base::Bind(&LanguageOptionsHandler::RestartCallback,
                   base::Unretained(this)));
  }
  
  base::ListValue* LanguageOptionsHandler::GetLanguageList() {
    // Collect the language codes from the supported accept-languages.
    const std::string app_locale = g_browser_process->GetApplicationLocale();
    std::vector<std::string> language_codes;
    l10n_util::GetAcceptLanguagesForLocale(app_locale, &language_codes);
  
    // Map of display name -> {language code, native_display_name}.
    // In theory, we should be able to create a map that is sorted by
    // display names using ICU comparator, but doing it is hard, thus we'll
    // use an auxiliary vector to achieve the same result.
    typedef std::pair<std::string, base::string16> LanguagePair;
    typedef std::map<base::string16, LanguagePair> LanguageMap;
    LanguageMap language_map;
    // The auxiliary vector mentioned above.
    std::vector<base::string16> display_names;
  
    // Build the list of display names, and build the language map.
    for (size_t i = 0; i < language_codes.size(); ++i) {
      base::string16 display_name =
          l10n_util::GetDisplayNameForLocale(language_codes[i], app_locale,
                                             false);
      base::string16 native_display_name =
          l10n_util::GetDisplayNameForLocale(language_codes[i], language_codes[i],
                                             false);
      display_names.push_back(display_name);
      language_map[display_name] =
          std::make_pair(language_codes[i], native_display_name);
    }
    DCHECK_EQ(display_names.size(), language_map.size());
  
    // Sort display names using locale specific sorter.
    l10n_util::SortStrings16(app_locale, &display_names);
  
    // Build the language list from the language map.
    base::ListValue* language_list = new base::ListValue();
    for (size_t i = 0; i < display_names.size(); ++i) {
      base::string16& display_name = display_names[i];
      base::string16 adjusted_display_name(display_name);
      base::i18n::AdjustStringForLocaleDirection(&adjusted_display_name);
  
      const LanguagePair& pair = language_map[display_name];
      base::string16 adjusted_native_display_name(pair.second);
      base::i18n::AdjustStringForLocaleDirection(&adjusted_native_display_name);
  
      bool has_rtl_chars = base::i18n::StringContainsStrongRTLChars(display_name);
      std::string directionality = has_rtl_chars ? "rtl" : "ltr";
  
      base::DictionaryValue* dictionary = new base::DictionaryValue();
      dictionary->SetString("code",  pair.first);
      dictionary->SetString("displayName", adjusted_display_name);
      dictionary->SetString("textDirection", directionality);
      dictionary->SetString("nativeDisplayName", adjusted_native_display_name);
      language_list->Append(dictionary);
    }
  
    return language_list;
  }
  
  base::string16 LanguageOptionsHandler::GetProductName() {
    return l10n_util::GetStringUTF16(IDS_PRODUCT_NAME);
  }
  
  void LanguageOptionsHandler::SetApplicationLocale(
      const std::string& language_code) {
    PrefService* pref_service = g_browser_process->local_state();
    pref_service->SetString(prefs::kApplicationLocale, language_code);
  }
  
  void LanguageOptionsHandler::RestartCallback(const base::ListValue* args) {
    content::RecordAction(UserMetricsAction("LanguageOptions_Restart"));
    chrome::AttemptRestart();
  }
  
  }  // namespace options
  