// 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/clear_browser_data_handler.h"

#include "base/basictypes.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/prefs/pref_service.h"
#include "base/string16.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/browsing_data/browsing_data_helper.h"
#include "chrome/browser/browsing_data/browsing_data_remover.h"
#include "chrome/browser/google/google_util.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/web_ui.h"
#include "grit/chromium_strings.h"
#include "grit/generated_resources.h"
#include "grit/locale_settings.h"
#include "ui/base/accelerators/accelerator.h"
#include "ui/base/l10n/l10n_util.h"

namespace {
const char kClearBrowsingDataLearnMoreUrl[] =
    "https://support.google.com/chrome/?p=settings_clear_browsing_data";
}

namespace options {

ClearBrowserDataHandler::ClearBrowserDataHandler()
    : remover_(NULL) {
}

ClearBrowserDataHandler::~ClearBrowserDataHandler() {
  if (remover_)
    remover_->RemoveObserver(this);
}

void ClearBrowserDataHandler::InitializeHandler() {
  PrefService* prefs = Profile::FromWebUI(web_ui())->GetPrefs();
  clear_plugin_lso_data_enabled_.Init(prefs::kClearPluginLSODataEnabled, prefs);
  pepper_flash_settings_enabled_.Init(prefs::kPepperFlashSettingsEnabled,
                                      prefs);
  allow_deleting_browser_history_.Init(
      prefs::kAllowDeletingBrowserHistory,
      prefs,
      base::Bind(&ClearBrowserDataHandler::OnBrowsingHistoryPrefChanged,
                 base::Unretained(this)));
}

void ClearBrowserDataHandler::InitializePage() {
  UpdateInfoBannerVisibility();
  OnBrowsingHistoryPrefChanged();
}

void ClearBrowserDataHandler::UpdateInfoBannerVisibility() {
  Profile* profile = Profile::FromWebUI(web_ui());
  base::Time lastClearBrowsingDataTime = base::Time::FromInternalValue(
      profile->GetPrefs()->GetInt64(prefs::kLastClearBrowsingDataTime));

  const int64 kHoursPerDay = 24;
  bool visible = (base::Time::Now() - lastClearBrowsingDataTime) <=
      base::TimeDelta::FromHours(kHoursPerDay);

  ListValue args;
  args.Append(Value::CreateBooleanValue(visible));
  web_ui()->CallJavascriptFunction(
      "ClearBrowserDataOverlay.setBannerVisibility", args);
}

void ClearBrowserDataHandler::GetLocalizedValues(
    DictionaryValue* localized_strings) {
  DCHECK(localized_strings);

  static OptionsStringResource resources[] = {
    { "clearBrowserDataLabel", IDS_CLEAR_BROWSING_DATA_LABEL },
    { "deleteBrowsingHistoryCheckbox", IDS_DEL_BROWSING_HISTORY_CHKBOX },
    { "deleteDownloadHistoryCheckbox", IDS_DEL_DOWNLOAD_HISTORY_CHKBOX },
    { "deleteCacheCheckbox", IDS_DEL_CACHE_CHKBOX },
    { "deleteCookiesCheckbox", IDS_DEL_COOKIES_CHKBOX },
    { "deleteCookiesFlashCheckbox", IDS_DEL_COOKIES_FLASH_CHKBOX },
    { "deletePasswordsCheckbox", IDS_DEL_PASSWORDS_CHKBOX },
    { "deleteFormDataCheckbox", IDS_DEL_FORM_DATA_CHKBOX },
    { "deleteHostedAppsDataCheckbox", IDS_DEL_HOSTED_APPS_DATA_CHKBOX },
    { "deauthorizeContentLicensesCheckbox",
      IDS_DEAUTHORIZE_CONTENT_LICENSES_CHKBOX },
    { "clearBrowserDataCommit", IDS_CLEAR_BROWSING_DATA_COMMIT },
    { "flash_storage_url", IDS_FLASH_STORAGE_URL },
  };

  RegisterStrings(localized_strings, resources, arraysize(resources));
  RegisterTitle(localized_strings, "clearBrowserDataOverlay",
                IDS_CLEAR_BROWSING_DATA_TITLE);
  localized_strings->SetString(
      "clearBrowsingDataLearnMoreUrl",
      google_util::StringAppendGoogleLocaleParam(
          kClearBrowsingDataLearnMoreUrl));

  ui::Accelerator acc(ui::VKEY_N, ui::EF_CONTROL_DOWN | ui::EF_SHIFT_DOWN);
  localized_strings->SetString(
      "clearBrowserDataInfoBar",
      l10n_util::GetStringFUTF16(
          IDS_CLEAR_BROWSING_DATA_INFO_BAR_TEXT,
          acc.GetShortcutText()));

  ListValue* time_list = new ListValue;
  for (int i = 0; i < 5; i++) {
    string16 label_string;
    switch (i) {
      case 0:
        label_string = l10n_util::GetStringUTF16(IDS_CLEAR_DATA_HOUR);
        break;
      case 1:
        label_string = l10n_util::GetStringUTF16(IDS_CLEAR_DATA_DAY);
        break;
      case 2:
        label_string = l10n_util::GetStringUTF16(IDS_CLEAR_DATA_WEEK);
        break;
      case 3:
        label_string = l10n_util::GetStringUTF16(IDS_CLEAR_DATA_4WEEKS);
        break;
      case 4:
        label_string = l10n_util::GetStringUTF16(IDS_CLEAR_DATA_EVERYTHING);
        break;
    }
    ListValue* option = new ListValue();
    option->Append(new base::FundamentalValue(i));
    option->Append(new base::StringValue(label_string));
    time_list->Append(option);
  }
  localized_strings->Set("clearBrowserDataTimeList", time_list);
}

void ClearBrowserDataHandler::RegisterMessages() {
  // Setup handlers specific to this panel.
  web_ui()->RegisterMessageCallback("performClearBrowserData",
      base::Bind(&ClearBrowserDataHandler::HandleClearBrowserData,
                 base::Unretained(this)));
}

void ClearBrowserDataHandler::HandleClearBrowserData(const ListValue* value) {
  DCHECK(!remover_);

  Profile* profile = Profile::FromWebUI(web_ui());
  PrefService* prefs = profile->GetPrefs();

  int site_data_mask = BrowsingDataRemover::REMOVE_SITE_DATA;
  // Don't try to clear LSO data if it's not supported.
  if (!*clear_plugin_lso_data_enabled_)
    site_data_mask &= ~BrowsingDataRemover::REMOVE_PLUGIN_DATA;

  int remove_mask = 0;
  int origin_mask = 0;
  if (prefs->GetBoolean(prefs::kDeleteBrowsingHistory) &&
      *allow_deleting_browser_history_) {
    remove_mask |= BrowsingDataRemover::REMOVE_HISTORY;
  }
  if (prefs->GetBoolean(prefs::kDeleteDownloadHistory) &&
      *allow_deleting_browser_history_) {
    remove_mask |= BrowsingDataRemover::REMOVE_DOWNLOADS;
  }
  if (prefs->GetBoolean(prefs::kDeleteCache))
    remove_mask |= BrowsingDataRemover::REMOVE_CACHED_DATA;
  if (prefs->GetBoolean(prefs::kDeleteCookies)) {
    remove_mask |= site_data_mask;
    origin_mask |= BrowsingDataHelper::UNPROTECTED_WEB;
  }
  if (prefs->GetBoolean(prefs::kDeletePasswords))
    remove_mask |= BrowsingDataRemover::REMOVE_PASSWORDS;
  if (prefs->GetBoolean(prefs::kDeleteFormData))
    remove_mask |= BrowsingDataRemover::REMOVE_FORM_DATA;
  // Clearing Content Licenses is only supported in Pepper Flash.
  if (prefs->GetBoolean(prefs::kDeauthorizeContentLicenses) &&
      *pepper_flash_settings_enabled_) {
    remove_mask |= BrowsingDataRemover::REMOVE_CONTENT_LICENSES;
  }
  if (prefs->GetBoolean(prefs::kDeleteHostedAppsData)) {
    remove_mask |= site_data_mask;
    origin_mask |= BrowsingDataHelper::PROTECTED_WEB;
  }

  // BrowsingDataRemover deletes itself when done.
  int period_selected = prefs->GetInteger(prefs::kDeleteTimePeriod);
  remover_ = BrowsingDataRemover::CreateForPeriod(profile,
      static_cast<BrowsingDataRemover::TimePeriod>(period_selected));
  remover_->AddObserver(this);
  remover_->Remove(remove_mask, origin_mask);

  // Store the clear browsing data time. Next time the clear browsing data
  // dialog is open, this time is used to decide whether to display an info
  // banner or not.
  prefs->SetInt64(prefs::kLastClearBrowsingDataTime,
                  base::Time::Now().ToInternalValue());
}

void ClearBrowserDataHandler::OnBrowsingDataRemoverDone() {
  // No need to remove ourselves as an observer as BrowsingDataRemover deletes
  // itself after we return.
  remover_ = NULL;
  web_ui()->CallJavascriptFunction("ClearBrowserDataOverlay.doneClearing");
}

void ClearBrowserDataHandler::OnBrowsingHistoryPrefChanged() {
  web_ui()->CallJavascriptFunction(
      "ClearBrowserDataOverlay.updateHistoryCheckboxes",
      base::FundamentalValue(*allow_deleting_browser_history_));
}

}  // namespace options