// Copyright (c) 2011 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/prefs/prefs_tab_helper.h"

#include "base/stringprintf.h"
#include "base/string_util.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/renderer_preferences_util.h"
#include "chrome/browser/themes/theme_service.h"
#include "chrome/browser/themes/theme_service_factory.h"
#include "chrome/browser/ui/constrained_window_tab_helper.h"
#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/pref_names.h"
#include "content/browser/renderer_host/render_view_host.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_service.h"
#include "grit/locale_settings.h"
#include "grit/platform_locale_settings.h"
#include "webkit/glue/webpreferences.h"

namespace {

const char* kPerTabPrefsToObserve[] = {
    prefs::kWebKitJavascriptEnabled
};

const int kPerTabPrefsToObserveLength = arraysize(kPerTabPrefsToObserve);

void RegisterPerTabUserPrefs(PrefService* prefs) {
  WebPreferences pref_defaults;

  prefs->RegisterBooleanPref(prefs::kWebKitJavascriptEnabled,
                             pref_defaults.javascript_enabled,
                             PrefService::UNSYNCABLE_PREF);
}

// The list of prefs we want to observe.
const char* kPrefsToObserve[] = {
  prefs::kDefaultCharset,
  prefs::kEnableReferrers,
  prefs::kWebKitAllowDisplayingInsecureContent,
  prefs::kWebKitAllowRunningInsecureContent,
  prefs::kWebKitCursiveFontFamily,
  prefs::kWebKitDefaultFixedFontSize,
  prefs::kWebKitDefaultFontSize,
  prefs::kWebKitFantasyFontFamily,
  prefs::kWebKitFixedFontFamily,
  prefs::kWebKitGlobalJavascriptEnabled,
  prefs::kWebKitJavaEnabled,
  prefs::kWebKitLoadsImagesAutomatically,
  prefs::kWebKitMinimumFontSize,
  prefs::kWebKitMinimumLogicalFontSize,
  prefs::kWebKitPluginsEnabled,
  prefs::kWebKitSansSerifFontFamily,
  prefs::kWebKitSerifFontFamily,
  prefs::kWebKitStandardFontFamily,
  prefs::kWebkitTabsToLinks,
  prefs::kWebKitUsesUniversalDetector
};

const int kPrefsToObserveLength = arraysize(kPrefsToObserve);

// Registers a preference under the path |map_name| for each script used for
// per-script font prefs.  For example, if |map_name| is "fonts.serif", then
// "fonts.serif.Arab", "fonts.serif.Hang", etc. are registered.
void RegisterFontFamilyMap(PrefService* prefs, const char* map_name) {
  for (size_t i = 0; i < prefs::kWebKitScriptsForFontFamilyMapsLength; ++i) {
    const char* script = prefs::kWebKitScriptsForFontFamilyMaps[i];
    std::string pref_name_str = base::StringPrintf("%s.%s", map_name, script);
    const char* pref_name = pref_name_str.c_str();
    if (!prefs->FindPreference(pref_name))
      prefs->RegisterStringPref(pref_name, "", PrefService::UNSYNCABLE_PREF);
  }
}

// Registers |obs| to observe per-script font prefs under the path |map_name|.
void RegisterFontFamilyMapObserver(PrefChangeRegistrar* registrar,
                                   const char* map_name,
                                   content::NotificationObserver* obs) {
  for (size_t i = 0; i < prefs::kWebKitScriptsForFontFamilyMapsLength; ++i) {
    const char* script = prefs::kWebKitScriptsForFontFamilyMaps[i];
    std::string pref_name = base::StringPrintf("%s.%s", map_name, script);
    registrar->Add(pref_name.c_str(), obs);
  }
}

struct PerScriptFontDefault {
  const char* pref_name;
  int resource_id;
  const char* native_locale;
};

// Per-script font pref defaults.  The prefs that have defaults vary by
// platform, since not all platforms have fonts for all scripts for all generic
// families.
// TODO(falken): add proper defaults when possible for all
// platforms/scripts/generic families.
const PerScriptFontDefault kPerScriptFontDefaults[] = {
#if defined(OS_CHROMEOS)
  { prefs::kWebKitStandardFontFamilyArabic, IDS_STANDARD_FONT_FAMILY_ARABIC,
    "ar" },
  { prefs::kWebKitSerifFontFamilyArabic, IDS_SERIF_FONT_FAMILY_ARABIC, "ar" },
  { prefs::kWebKitSansSerifFontFamilyArabic,
    IDS_SANS_SERIF_FONT_FAMILY_ARABIC, "ar" },
  { prefs::kWebKitStandardFontFamilyJapanese,
    IDS_STANDARD_FONT_FAMILY_JAPANESE, "ja" },
  { prefs::kWebKitFixedFontFamilyJapanese, IDS_FIXED_FONT_FAMILY_JAPANESE,
    "ja" },
  { prefs::kWebKitSerifFontFamilyJapanese, IDS_SERIF_FONT_FAMILY_JAPANESE,
    "ja" },
  { prefs::kWebKitSansSerifFontFamilyJapanese,
    IDS_SANS_SERIF_FONT_FAMILY_JAPANESE, "ja" },
  { prefs::kWebKitStandardFontFamilyKorean, IDS_STANDARD_FONT_FAMILY_KOREAN,
    "ko" },
  { prefs::kWebKitFixedFontFamilyKorean, IDS_FIXED_FONT_FAMILY_KOREAN, "ko" },
  { prefs::kWebKitSerifFontFamilyKorean, IDS_SERIF_FONT_FAMILY_KOREAN, "ko" },
  { prefs::kWebKitSansSerifFontFamilyKorean,
    IDS_SANS_SERIF_FONT_FAMILY_KOREAN, "ko" },
  { prefs::kWebKitStandardFontFamilySimplifiedHan,
    IDS_STANDARD_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitFixedFontFamilySimplifiedHan,
    IDS_FIXED_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitSerifFontFamilySimplifiedHan,
    IDS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitSansSerifFontFamilySimplifiedHan,
    IDS_SANS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitStandardFontFamilyTraditionalHan,
    IDS_STANDARD_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" },
  { prefs::kWebKitFixedFontFamilyTraditionalHan,
    IDS_FIXED_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" },
  { prefs::kWebKitSerifFontFamilyTraditionalHan,
    IDS_SERIF_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" },
  { prefs::kWebKitSansSerifFontFamilyTraditionalHan,
    IDS_SANS_SERIF_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" }
#elif defined(OS_MACOSX)
  { prefs::kWebKitStandardFontFamilyJapanese,
    IDS_STANDARD_FONT_FAMILY_JAPANESE, "ja" },
  { prefs::kWebKitFixedFontFamilyJapanese, IDS_FIXED_FONT_FAMILY_JAPANESE,
    "ja" },
  { prefs::kWebKitSerifFontFamilyJapanese, IDS_SERIF_FONT_FAMILY_JAPANESE,
    "ja" },
  { prefs::kWebKitSansSerifFontFamilyJapanese,
    IDS_SANS_SERIF_FONT_FAMILY_JAPANESE, "ja" },
  { prefs::kWebKitStandardFontFamilyKorean, IDS_STANDARD_FONT_FAMILY_KOREAN,
    "ko" },
  { prefs::kWebKitSerifFontFamilyKorean, IDS_SERIF_FONT_FAMILY_KOREAN, "ko" },
  { prefs::kWebKitSansSerifFontFamilyKorean,
    IDS_SANS_SERIF_FONT_FAMILY_KOREAN, "ko" },
  { prefs::kWebKitStandardFontFamilySimplifiedHan,
    IDS_STANDARD_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitSerifFontFamilySimplifiedHan,
    IDS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitSansSerifFontFamilySimplifiedHan,
    IDS_SANS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitStandardFontFamilyTraditionalHan,
    IDS_STANDARD_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" },
  { prefs::kWebKitSerifFontFamilyTraditionalHan,
    IDS_SERIF_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" },
  { prefs::kWebKitSansSerifFontFamilyTraditionalHan,
    IDS_SANS_SERIF_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" }
#elif defined(OS_WIN)
  { prefs::kWebKitStandardFontFamilyJapanese,
    IDS_STANDARD_FONT_FAMILY_JAPANESE, "ja" },
  { prefs::kWebKitFixedFontFamilyJapanese, IDS_FIXED_FONT_FAMILY_JAPANESE,
    "ja" },
  { prefs::kWebKitSerifFontFamilyJapanese, IDS_SERIF_FONT_FAMILY_JAPANESE,
    "ja" },
  { prefs::kWebKitSansSerifFontFamilyJapanese,
    IDS_SANS_SERIF_FONT_FAMILY_JAPANESE, "ja" },
  { prefs::kWebKitStandardFontFamilyKorean, IDS_STANDARD_FONT_FAMILY_KOREAN,
    "ko" },
  { prefs::kWebKitFixedFontFamilyKorean, IDS_FIXED_FONT_FAMILY_KOREAN, "ko" },
  { prefs::kWebKitSerifFontFamilyKorean, IDS_SERIF_FONT_FAMILY_KOREAN, "ko" },
  { prefs::kWebKitSansSerifFontFamilyKorean,
    IDS_SANS_SERIF_FONT_FAMILY_KOREAN, "ko" },
  { prefs::kWebKitCursiveFontFamilyKorean, IDS_CURSIVE_FONT_FAMILY_KOREAN,
    "ko" },
  { prefs::kWebKitStandardFontFamilySimplifiedHan,
    IDS_STANDARD_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitFixedFontFamilySimplifiedHan,
    IDS_FIXED_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitSerifFontFamilySimplifiedHan,
    IDS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitSansSerifFontFamilySimplifiedHan,
    IDS_SANS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN, "zh-CN" },
  { prefs::kWebKitStandardFontFamilyTraditionalHan,
    IDS_STANDARD_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" },
  { prefs::kWebKitFixedFontFamilyTraditionalHan,
    IDS_FIXED_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" },
  { prefs::kWebKitSerifFontFamilyTraditionalHan,
    IDS_SERIF_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" },
  { prefs::kWebKitSansSerifFontFamilyTraditionalHan,
    IDS_SANS_SERIF_FONT_FAMILY_TRADITIONAL_HAN, "zh-TW" }
#endif
};

#if defined(OS_CHROMEOS) || defined(OS_MACOSX) || defined(OS_WIN)
// To avoid Clang warning, only define kPerScriptFontDefaultsLength when it is
// non-zero.  When it is zero, code like
//  for (size_t i = 0; i < kPerScriptFontDefaultsLength; ++i)
// causes a warning due to comparison of unsigned expression < 0.
const size_t kPerScriptFontDefaultsLength = arraysize(kPerScriptFontDefaults);
#endif

}  // namespace

PrefsTabHelper::PrefsTabHelper(TabContentsWrapper* wrapper)
    : TabContentsObserver(wrapper->tab_contents()),
      wrapper_(wrapper) {
  PrefService* prefs = wrapper->profile()->GetPrefs();
  pref_change_registrar_.Init(prefs);
  if (prefs) {
    for (int i = 0; i < kPrefsToObserveLength; ++i)
      pref_change_registrar_.Add(kPrefsToObserve[i], this);

    RegisterFontFamilyMapObserver(&pref_change_registrar_,
                                  prefs::kWebKitStandardFontFamilyMap, this);
    RegisterFontFamilyMapObserver(&pref_change_registrar_,
                                  prefs::kWebKitFixedFontFamilyMap, this);
    RegisterFontFamilyMapObserver(&pref_change_registrar_,
                                  prefs::kWebKitSerifFontFamilyMap, this);
    RegisterFontFamilyMapObserver(&pref_change_registrar_,
                                  prefs::kWebKitSansSerifFontFamilyMap, this);
    RegisterFontFamilyMapObserver(&pref_change_registrar_,
                                  prefs::kWebKitCursiveFontFamilyMap, this);
    RegisterFontFamilyMapObserver(&pref_change_registrar_,
                                  prefs::kWebKitFantasyFontFamilyMap, this);
  }

  per_tab_prefs_.reset(
      wrapper_->profile()->GetPrefs()->CreatePrefServiceWithPerTabPrefStore());
  RegisterPerTabUserPrefs(per_tab_prefs_.get());
  per_tab_pref_change_registrar_.Init(per_tab_prefs_.get());
  for (int i = 0; i < kPerTabPrefsToObserveLength; ++i) {
      per_tab_pref_change_registrar_.Add(kPerTabPrefsToObserve[i], this);
  }

  renderer_preferences_util::UpdateFromSystemSettings(
      tab_contents()->GetMutableRendererPrefs(), wrapper_->profile());

  registrar_.Add(this, chrome::NOTIFICATION_USER_STYLE_SHEET_UPDATED,
                 content::NotificationService::AllSources());
#if defined(OS_POSIX) && !defined(OS_MACOSX)
  registrar_.Add(this, chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
                 content::Source<ThemeService>(
                     ThemeServiceFactory::GetForProfile(wrapper->profile())));
#endif
}

PrefsTabHelper::~PrefsTabHelper() {
}

// static
void PrefsTabHelper::RegisterUserPrefs(PrefService* prefs) {
  WebPreferences pref_defaults;
  prefs->RegisterBooleanPref(prefs::kWebKitGlobalJavascriptEnabled,
                             pref_defaults.javascript_enabled,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitWebSecurityEnabled,
                             pref_defaults.web_security_enabled,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(
      prefs::kWebKitJavascriptCanOpenWindowsAutomatically,
      true,
      PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitLoadsImagesAutomatically,
                             pref_defaults.loads_images_automatically,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitPluginsEnabled,
                             pref_defaults.plugins_enabled,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitDomPasteEnabled,
                             pref_defaults.dom_paste_enabled,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitShrinksStandaloneImagesToFit,
                             pref_defaults.shrinks_standalone_images_to_fit,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterDictionaryPref(prefs::kWebKitInspectorSettings,
                                PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitTextAreasAreResizable,
                             pref_defaults.text_areas_are_resizable,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitJavaEnabled,
                             pref_defaults.java_enabled,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebkitTabsToLinks,
                             pref_defaults.tabs_to_links,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitAllowRunningInsecureContent,
                             false,
                             PrefService::UNSYNCABLE_PREF);
  prefs->RegisterBooleanPref(prefs::kWebKitAllowDisplayingInsecureContent,
                             true,
                             PrefService::UNSYNCABLE_PREF);

#if !defined(OS_MACOSX)
  prefs->RegisterLocalizedStringPref(prefs::kAcceptLanguages,
                                     IDS_ACCEPT_LANGUAGES,
                                     PrefService::SYNCABLE_PREF);
#else
  // Not used in OSX.
  prefs->RegisterLocalizedStringPref(prefs::kAcceptLanguages,
                                     IDS_ACCEPT_LANGUAGES,
                                     PrefService::UNSYNCABLE_PREF);
#endif
  prefs->RegisterLocalizedStringPref(prefs::kDefaultCharset,
                                     IDS_DEFAULT_ENCODING,
                                     PrefService::SYNCABLE_PREF);
  prefs->RegisterLocalizedStringPref(prefs::kWebKitStandardFontFamily,
                                     IDS_STANDARD_FONT_FAMILY,
                                     PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedStringPref(prefs::kWebKitFixedFontFamily,
                                     IDS_FIXED_FONT_FAMILY,
                                     PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedStringPref(prefs::kWebKitSerifFontFamily,
                                     IDS_SERIF_FONT_FAMILY,
                                     PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedStringPref(prefs::kWebKitSansSerifFontFamily,
                                     IDS_SANS_SERIF_FONT_FAMILY,
                                     PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedStringPref(prefs::kWebKitCursiveFontFamily,
                                     IDS_CURSIVE_FONT_FAMILY,
                                     PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedStringPref(prefs::kWebKitFantasyFontFamily,
                                     IDS_FANTASY_FONT_FAMILY,
                                     PrefService::UNSYNCABLE_PREF);

  // Register per-script font prefs that have defaults.
#if defined(OS_CHROMEOS) || defined(OS_MACOSX) || defined(OS_WIN)
  // As explained by its definition, kPerScriptFontDefaultsLength is only
  // defined for platforms where it would be non-zero.
  std::string locale = g_browser_process->GetApplicationLocale();
  for (size_t i = 0; i < kPerScriptFontDefaultsLength; ++i) {
    const PerScriptFontDefault& pref = kPerScriptFontDefaults[i];
    // Suppress default per-script font when the script matches the browser's
    // locale.  Otherwise, the default would override the user's preferences
    // when viewing pages in their native language.  This can be removed when
    // per-script fonts are added to Preferences UI.
    if (!StartsWithASCII(locale, pref.native_locale, false)) {
      prefs->RegisterLocalizedStringPref(pref.pref_name,
                                         pref.resource_id,
                                         PrefService::UNSYNCABLE_PREF);
    }
  }
#endif

  // Register the rest of the per-script font prefs.
  RegisterFontFamilyMap(prefs, prefs::kWebKitStandardFontFamilyMap);
  RegisterFontFamilyMap(prefs, prefs::kWebKitFixedFontFamilyMap);
  RegisterFontFamilyMap(prefs, prefs::kWebKitSerifFontFamilyMap);
  RegisterFontFamilyMap(prefs, prefs::kWebKitSansSerifFontFamilyMap);
  RegisterFontFamilyMap(prefs, prefs::kWebKitCursiveFontFamilyMap);
  RegisterFontFamilyMap(prefs, prefs::kWebKitFantasyFontFamilyMap);

  prefs->RegisterLocalizedIntegerPref(prefs::kWebKitDefaultFontSize,
                                      IDS_DEFAULT_FONT_SIZE,
                                      PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedIntegerPref(prefs::kWebKitDefaultFixedFontSize,
                                      IDS_DEFAULT_FIXED_FONT_SIZE,
                                      PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedIntegerPref(prefs::kWebKitMinimumFontSize,
                                      IDS_MINIMUM_FONT_SIZE,
                                      PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedIntegerPref(prefs::kWebKitMinimumLogicalFontSize,
                                      IDS_MINIMUM_LOGICAL_FONT_SIZE,
                                      PrefService::UNSYNCABLE_PREF);
  prefs->RegisterLocalizedBooleanPref(prefs::kWebKitUsesUniversalDetector,
                                      IDS_USES_UNIVERSAL_DETECTOR,
                                      PrefService::SYNCABLE_PREF);
  prefs->RegisterLocalizedStringPref(prefs::kStaticEncodings,
                                     IDS_STATIC_ENCODING_LIST,
                                     PrefService::UNSYNCABLE_PREF);
  prefs->RegisterStringPref(prefs::kRecentlySelectedEncoding,
                            "",
                            PrefService::UNSYNCABLE_PREF);
}

void PrefsTabHelper::RenderViewCreated(RenderViewHost* render_view_host) {
  UpdateWebPreferences();
}

void PrefsTabHelper::TabContentsDestroyed(TabContents* tab) {
  per_tab_pref_change_registrar_.RemoveAll();
}

void PrefsTabHelper::Observe(int type,
                             const content::NotificationSource& source,
                             const content::NotificationDetails& details) {
  switch (type) {
    case chrome::NOTIFICATION_USER_STYLE_SHEET_UPDATED:
      UpdateWebPreferences();
      break;
#if defined(OS_POSIX) && !defined(OS_MACOSX)
    case chrome::NOTIFICATION_BROWSER_THEME_CHANGED: {
      UpdateRendererPreferences();
      break;
    }
#endif
    case chrome::NOTIFICATION_PREF_CHANGED: {
      std::string* pref_name_in = content::Details<std::string>(details).ptr();
      DCHECK(content::Source<PrefService>(source).ptr() ==
                 wrapper_->profile()->GetPrefs() ||
             content::Source<PrefService>(source).ptr() == per_tab_prefs_);
      if ((*pref_name_in == prefs::kDefaultCharset) ||
          StartsWithASCII(*pref_name_in, "webkit.webprefs.", true)) {
        UpdateWebPreferences();
      } else if (*pref_name_in == prefs::kEnableReferrers) {
        UpdateRendererPreferences();
      } else {
        NOTREACHED() << "unexpected pref change notification" << *pref_name_in;
      }
      break;
    }
    default:
      NOTREACHED();
  }
}

void PrefsTabHelper::UpdateWebPreferences() {
  RenderViewHostDelegate* rvhd = tab_contents();
  WebPreferences prefs = rvhd->GetWebkitPrefs();
  prefs.javascript_enabled =
      per_tab_prefs_->GetBoolean(prefs::kWebKitJavascriptEnabled);
  tab_contents()->render_view_host()->UpdateWebkitPreferences(prefs);
}

void PrefsTabHelper::UpdateRendererPreferences() {
  renderer_preferences_util::UpdateFromSystemSettings(
      tab_contents()->GetMutableRendererPrefs(), wrapper_->profile());
  tab_contents()->render_view_host()->SyncRendererPrefs();
}