text: // Copyright 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 "chrome/browser/chromeos/system/timezone_util.h"
  
  #include <stddef.h>
  
  #include <string>
  
  #include "base/i18n/rtl.h"
  #include "base/lazy_instance.h"
  #include "base/strings/string_util.h"
  #include "base/strings/stringprintf.h"
  #include "base/strings/utf_string_conversions.h"
  #include "base/synchronization/lock.h"
  #include "base/values.h"
  #include "chrome/browser/browser_process.h"
  #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
  #include "chrome/browser/chromeos/profiles/profile_helper.h"
  #include "chrome/browser/chromeos/settings/cros_settings.h"
  #include "chrome/browser/chromeos/system/timezone_resolver_manager.h"
  #include "chrome/grit/generated_resources.h"
  #include "chromeos/settings/timezone_settings.h"
  #include "chromeos/timezone/timezone_request.h"
  #include "components/prefs/pref_service.h"
  #include "components/user_manager/user_manager.h"
  #include "third_party/icu/source/common/unicode/ures.h"
  #include "third_party/icu/source/common/unicode/utypes.h"
  #include "third_party/icu/source/i18n/unicode/calendar.h"
  #include "third_party/icu/source/i18n/unicode/timezone.h"
  #include "ui/base/l10n/l10n_util.h"
  
  namespace {
  
  struct UResClose {
    inline void operator() (UResourceBundle* b) const {
      ures_close(b);
    }
  };
  
  static base::LazyInstance<base::Lock>::Leaky
      g_timezone_bundle_lock = LAZY_INSTANCE_INITIALIZER;
  
  // Returns an exemplary city in the given timezone.
  base::string16 GetExemplarCity(const icu::TimeZone& zone) {
    // TODO(jungshik): After upgrading to ICU 4.6, use U_ICUDATA_ZONE
    static const char* zone_bundle_name = NULL;
  
    // These will be leaked at the end.
    static UResourceBundle *zone_bundle = NULL;
    static UResourceBundle *zone_strings = NULL;
  
    UErrorCode status = U_ZERO_ERROR;
    {
      base::AutoLock lock(g_timezone_bundle_lock.Get());
      if (zone_bundle == NULL)
        zone_bundle = ures_open(zone_bundle_name, uloc_getDefault(), &status);
  
      if (zone_strings == NULL)
        zone_strings = ures_getByKey(zone_bundle, "zone_strings", NULL, &status);
    }
  
    icu::UnicodeString zone_id;
    zone.getID(zone_id);
    std::string zone_id_str;
    zone_id.toUTF8String(zone_id_str);
  
    // Resource keys for timezones use ':' in place of '/'.
    base::ReplaceSubstringsAfterOffset(&zone_id_str, 0, "/", ":");
    std::unique_ptr<UResourceBundle, UResClose> zone_item(
        ures_getByKey(zone_strings, zone_id_str.c_str(), NULL, &status));
    icu::UnicodeString city;
    if (!U_FAILURE(status)) {
      city = icu::ures_getUnicodeStringByKey(zone_item.get(), "ec", &status);
      if (U_SUCCESS(status))
        return base::string16(city.getBuffer(), city.length());
    }
  
    // Fallback case in case of failure.
    base::ReplaceSubstringsAfterOffset(&zone_id_str, 0, ":", "/");
    // Take the last component of a timezone id (e.g. 'Baz' in 'Foo/Bar/Baz').
    // Depending on timezones, keeping all but the 1st component
    // (e.g. Bar/Baz) may be better, but our current list does not have
    // any timezone for which that's the case.
    std::string::size_type slash_pos = zone_id_str.rfind('/');
    if (slash_pos != std::string::npos && slash_pos < zone_id_str.size())
      zone_id_str.erase(0, slash_pos + 1);
    // zone id has '_' in place of ' '.
    base::ReplaceSubstringsAfterOffset(&zone_id_str, 0, "_", " ");
    return base::ASCIIToUTF16(zone_id_str);
  }
  
  // Gets the given timezone's name for visualization.
  base::string16 GetTimezoneName(const icu::TimeZone& timezone) {
    // Instead of using the raw_offset, use the offset in effect now.
    // For instance, US Pacific Time, the offset shown will be -7 in summer
    // while it'll be -8 in winter.
    int raw_offset, dst_offset;
    UDate now = icu::Calendar::getNow();
    UErrorCode status = U_ZERO_ERROR;
    timezone.getOffset(now, false, raw_offset, dst_offset, status);
    DCHECK(U_SUCCESS(status));
    int offset = raw_offset + dst_offset;
    // |offset| is in msec.
    int minute_offset = std::abs(offset) / 60000;
    int hour_offset = minute_offset / 60;
    int min_remainder = minute_offset % 60;
    // Some timezones have a non-integral hour offset. So, we need to use hh:mm
    // form.
    std::string  offset_str = base::StringPrintf(offset >= 0 ?
        "UTC+%d:%02d" : "UTC-%d:%02d", hour_offset, min_remainder);
  
    // TODO(jungshik): When coming up with a better list of timezones, we also
    // have to come up with better 'display' names. One possibility is to list
    // multiple cities (e.g. "Los Angeles, Vancouver .." in the order of
    // the population of a country the city belongs to.).
    // We can also think of using LONG_GENERIC or LOCATION once we upgrade
    // to ICU 4.6.
    // In the meantime, we use "LONG" name with "Exemplar City" to distinguish
    // multiple timezones with the same "LONG" name but with different
    // rules (e.g. US Mountain Time in Denver vs Phoenix).
    icu::UnicodeString id;
    icu::UnicodeString name;
    timezone.getID(id);
    if (id == icu::UnicodeString(chromeos::system::kUTCTimezoneName)) {
      name = icu::UnicodeString(
          l10n_util::GetStringUTF8(IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_NAME_UTC)
              .c_str());
    } else {
      timezone.getDisplayName(dst_offset != 0, icu::TimeZone::LONG, name);
    }
    base::string16 result(l10n_util::GetStringFUTF16(
        IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_TEMPLATE,
        base::ASCIIToUTF16(offset_str),
        base::string16(name.getBuffer(), name.length()),
        GetExemplarCity(timezone)));
    base::i18n::AdjustStringForLocaleDirection(&result);
    return result;
  }
  
  }  // namespace
  
  namespace chromeos {
  namespace system {
  
  // Creates a list of pairs of each timezone's ID and name.
  std::unique_ptr<base::ListValue> GetTimezoneList() {
    const std::vector<icu::TimeZone*> &timezones =
        chromeos::system::TimezoneSettings::GetInstance()->GetTimezoneList();
    std::unique_ptr<base::ListValue> timezoneList(new base::ListValue());
    for (std::vector<icu::TimeZone*>::const_iterator iter = timezones.begin();
         iter != timezones.end(); ++iter) {
      const icu::TimeZone* timezone = *iter;
      base::ListValue* option = new base::ListValue();
      option->Append(new base::StringValue(
          chromeos::system::TimezoneSettings::GetTimezoneID(*timezone)));
      option->Append(new base::StringValue(GetTimezoneName(*timezone)));
      timezoneList->Append(option);
    }
    return timezoneList;
  }
  
  bool HasSystemTimezonePolicy() {
    policy::BrowserPolicyConnectorChromeOS* connector =
        g_browser_process->platform_part()->browser_policy_connector_chromeos();
    if (!connector->IsEnterpriseManaged())
      return false;
  
    std::string policy_timezone;
    if (chromeos::CrosSettings::Get()->GetString(chromeos::kSystemTimezonePolicy,
                                                 &policy_timezone) &&
        !policy_timezone.empty()) {
      VLOG(1) << "Refresh TimeZone: TimeZone settings are overridden"
              << " by DevicePolicy.";
      return true;
    }
    return false;
  }
  
  void ApplyTimeZone(const TimeZoneResponseData* timezone) {
    if (!g_browser_process->platform_part()
             ->GetTimezoneResolverManager()
             ->ShouldApplyResolvedTimezone()) {
      return;
    }
  
    if (!timezone->timeZoneId.empty()) {
      VLOG(1) << "Refresh TimeZone: setting timezone to '" << timezone->timeZoneId
              << "'";
  
      chromeos::system::TimezoneSettings::GetInstance()->SetTimezoneFromID(
          base::UTF8ToUTF16(timezone->timeZoneId));
    }
  }
  
  }  // namespace system
  }  // namespace chromeos
  