1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/chromeos/system/timezone_util.h"
6
7#include <string>
8
9#include "base/i18n/rtl.h"
10#include "base/lazy_instance.h"
11#include "base/strings/string_util.h"
12#include "base/strings/stringprintf.h"
13#include "base/strings/utf_string_conversions.h"
14#include "base/synchronization/lock.h"
15#include "base/values.h"
16#include "chrome/grit/generated_resources.h"
17#include "chromeos/settings/timezone_settings.h"
18#include "third_party/icu/source/common/unicode/ures.h"
19#include "third_party/icu/source/common/unicode/utypes.h"
20#include "third_party/icu/source/i18n/unicode/calendar.h"
21#include "third_party/icu/source/i18n/unicode/timezone.h"
22#include "ui/base/l10n/l10n_util.h"
23
24namespace {
25
26struct UResClose {
27  inline void operator() (UResourceBundle* b) const {
28    ures_close(b);
29  }
30};
31
32static base::LazyInstance<base::Lock>::Leaky
33    g_timezone_bundle_lock = LAZY_INSTANCE_INITIALIZER;
34
35// Returns an exemplary city in the given timezone.
36base::string16 GetExemplarCity(const icu::TimeZone& zone) {
37  // TODO(jungshik): After upgrading to ICU 4.6, use U_ICUDATA_ZONE
38  static const char* zone_bundle_name = NULL;
39
40  // These will be leaked at the end.
41  static UResourceBundle *zone_bundle = NULL;
42  static UResourceBundle *zone_strings = NULL;
43
44  UErrorCode status = U_ZERO_ERROR;
45  {
46    base::AutoLock lock(g_timezone_bundle_lock.Get());
47    if (zone_bundle == NULL)
48      zone_bundle = ures_open(zone_bundle_name, uloc_getDefault(), &status);
49
50    if (zone_strings == NULL)
51      zone_strings = ures_getByKey(zone_bundle, "zone_strings", NULL, &status);
52  }
53
54  icu::UnicodeString zone_id;
55  zone.getID(zone_id);
56  std::string zone_id_str;
57  zone_id.toUTF8String(zone_id_str);
58
59  // Resource keys for timezones use ':' in place of '/'.
60  ReplaceSubstringsAfterOffset(&zone_id_str, 0, "/", ":");
61  scoped_ptr<UResourceBundle, UResClose> zone_item(
62      ures_getByKey(zone_strings, zone_id_str.c_str(), NULL, &status));
63  icu::UnicodeString city;
64  if (!U_FAILURE(status)) {
65    city = icu::ures_getUnicodeStringByKey(zone_item.get(), "ec", &status);
66    if (U_SUCCESS(status))
67      return base::string16(city.getBuffer(), city.length());
68  }
69
70  // Fallback case in case of failure.
71  ReplaceSubstringsAfterOffset(&zone_id_str, 0, ":", "/");
72  // Take the last component of a timezone id (e.g. 'Baz' in 'Foo/Bar/Baz').
73  // Depending on timezones, keeping all but the 1st component
74  // (e.g. Bar/Baz) may be better, but our current list does not have
75  // any timezone for which that's the case.
76  std::string::size_type slash_pos = zone_id_str.rfind('/');
77  if (slash_pos != std::string::npos && slash_pos < zone_id_str.size())
78    zone_id_str.erase(0, slash_pos + 1);
79  // zone id has '_' in place of ' '.
80  ReplaceSubstringsAfterOffset(&zone_id_str, 0, "_", " ");
81  return base::ASCIIToUTF16(zone_id_str);
82}
83
84// Gets the given timezone's name for visualization.
85base::string16 GetTimezoneName(const icu::TimeZone& timezone) {
86  // Instead of using the raw_offset, use the offset in effect now.
87  // For instance, US Pacific Time, the offset shown will be -7 in summer
88  // while it'll be -8 in winter.
89  int raw_offset, dst_offset;
90  UDate now = icu::Calendar::getNow();
91  UErrorCode status = U_ZERO_ERROR;
92  timezone.getOffset(now, false, raw_offset, dst_offset, status);
93  DCHECK(U_SUCCESS(status));
94  int offset = raw_offset + dst_offset;
95  // |offset| is in msec.
96  int minute_offset = std::abs(offset) / 60000;
97  int hour_offset = minute_offset / 60;
98  int min_remainder = minute_offset % 60;
99  // Some timezones have a non-integral hour offset. So, we need to use hh:mm
100  // form.
101  std::string  offset_str = base::StringPrintf(offset >= 0 ?
102      "UTC+%d:%02d" : "UTC-%d:%02d", hour_offset, min_remainder);
103
104  // TODO(jungshik): When coming up with a better list of timezones, we also
105  // have to come up with better 'display' names. One possibility is to list
106  // multiple cities (e.g. "Los Angeles, Vancouver .." in the order of
107  // the population of a country the city belongs to.).
108  // We can also think of using LONG_GENERIC or LOCATION once we upgrade
109  // to ICU 4.6.
110  // In the meantime, we use "LONG" name with "Exemplar City" to distinguish
111  // multiple timezones with the same "LONG" name but with different
112  // rules (e.g. US Mountain Time in Denver vs Phoenix).
113  icu::UnicodeString name;
114  timezone.getDisplayName(dst_offset != 0, icu::TimeZone::LONG, name);
115  base::string16 result(l10n_util::GetStringFUTF16(
116      IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_TEMPLATE,
117      base::ASCIIToUTF16(offset_str),
118      base::string16(name.getBuffer(), name.length()),
119      GetExemplarCity(timezone)));
120  base::i18n::AdjustStringForLocaleDirection(&result);
121  return result;
122}
123
124}  // namespace
125
126namespace chromeos {
127namespace system {
128
129// Creates a list of pairs of each timezone's ID and name.
130scoped_ptr<base::ListValue> GetTimezoneList() {
131  const std::vector<icu::TimeZone*> &timezones =
132      chromeos::system::TimezoneSettings::GetInstance()->GetTimezoneList();
133  scoped_ptr<base::ListValue> timezoneList(new base::ListValue());
134  for (std::vector<icu::TimeZone*>::const_iterator iter = timezones.begin();
135       iter != timezones.end(); ++iter) {
136    const icu::TimeZone* timezone = *iter;
137    base::ListValue* option = new base::ListValue();
138    option->Append(new base::StringValue(
139        chromeos::system::TimezoneSettings::GetTimezoneID(*timezone)));
140    option->Append(new base::StringValue(GetTimezoneName(*timezone)));
141    timezoneList->Append(option);
142  }
143  return timezoneList.Pass();
144}
145
146}  // namespace system
147}  // namespace chromeos
148