// Copyright (c) 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/notifications/message_center_settings_controller.h"

#include <algorithm>

#include "base/command_line.h"
#include "base/i18n/string_compare.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/extensions/app_icon_loader_impl.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/favicon/favicon_service.h"
#include "chrome/browser/favicon/favicon_service_factory.h"
#include "chrome/browser/favicon/favicon_types.h"
#include "chrome/browser/history/history_types.h"
#include "chrome/browser/notifications/desktop_notification_service.h"
#include "chrome/browser/notifications/desktop_notification_service_factory.h"
#include "chrome/browser/notifications/sync_notifier/chrome_notifier_service.h"
#include "chrome/browser/notifications/sync_notifier/chrome_notifier_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/common/cancelable_task_tracker.h"
#include "chrome/common/extensions/extension_constants.h"
#include "grit/theme_resources.h"
#include "grit/ui_strings.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/image/image.h"
#include "ui/message_center/message_center_style.h"

#if defined(USE_ASH)
#include "ash/shell.h"
#include "ash/system/web_notification/web_notification_tray.h"
#endif

using message_center::Notifier;
using message_center::NotifierId;

namespace {

class NotifierComparator {
 public:
  explicit NotifierComparator(icu::Collator* collator) : collator_(collator) {}

  bool operator() (Notifier* n1, Notifier* n2) {
    return base::i18n::CompareString16WithCollator(
        collator_, n1->name, n2->name) == UCOL_LESS;
  }

 private:
  icu::Collator* collator_;
};

bool SimpleCompareNotifiers(Notifier* n1, Notifier* n2) {
  return n1->name < n2->name;
}

}  // namespace

MessageCenterSettingsController::MessageCenterSettingsController() {
}

MessageCenterSettingsController::~MessageCenterSettingsController() {
}

void MessageCenterSettingsController::AddObserver(
    message_center::NotifierSettingsObserver* observer) {
  observers_.AddObserver(observer);
}

void MessageCenterSettingsController::RemoveObserver(
    message_center::NotifierSettingsObserver* observer) {
  observers_.RemoveObserver(observer);
}

void MessageCenterSettingsController::GetNotifierList(
    std::vector<Notifier*>* notifiers) {
  DCHECK(notifiers);
  // TODO(mukai): Fix this for multi-profile.
  // Temporarily use the last used profile to prevent chrome from crashing when
  // the default profile is not loaded.
  Profile* profile = ProfileManager::GetLastUsedProfileAllowedByPolicy();
  DesktopNotificationService* notification_service =
      DesktopNotificationServiceFactory::GetForProfile(profile);

  UErrorCode error;
  scoped_ptr<icu::Collator> collator(icu::Collator::createInstance(error));
  scoped_ptr<NotifierComparator> comparator;
  if (!U_FAILURE(error))
    comparator.reset(new NotifierComparator(collator.get()));

  ExtensionService* extension_service = profile->GetExtensionService();
  const ExtensionSet* extension_set = extension_service->extensions();
  // The extension icon size has to be 32x32 at least to load bigger icons if
  // the icon doesn't exist for the specified size, and in that case it falls
  // back to the default icon. The fetched icon will be resized in the settings
  // dialog. See chrome/browser/extensions/extension_icon_image.cc and
  // crbug.com/222931
  app_icon_loader_.reset(new extensions::AppIconLoaderImpl(
      profile, extension_misc::EXTENSION_ICON_SMALL, this));
  for (ExtensionSet::const_iterator iter = extension_set->begin();
       iter != extension_set->end(); ++iter) {
    const extensions::Extension* extension = iter->get();
    if (!extension->HasAPIPermission(
            extensions::APIPermission::kNotification)) {
      continue;
    }

    NotifierId notifier_id(NotifierId::APPLICATION, extension->id());
    notifiers->push_back(new Notifier(
        notifier_id,
        UTF8ToUTF16(extension->name()),
        notification_service->IsNotifierEnabled(notifier_id)));
    app_icon_loader_->FetchImage(extension->id());
  }

  if (notifier::ChromeNotifierServiceFactory::UseSyncedNotifications(
          CommandLine::ForCurrentProcess())) {
    notifier::ChromeNotifierService* sync_notifier_service =
        notifier::ChromeNotifierServiceFactory::GetInstance()->GetForProfile(
            profile, Profile::EXPLICIT_ACCESS);
    sync_notifier_service->GetSyncedNotificationServices(notifiers);

    if (comparator)
      std::sort(notifiers->begin(), notifiers->end(), *comparator);
    else
      std::sort(notifiers->begin(), notifiers->end(), SimpleCompareNotifiers);
  }

  int app_count = notifiers->size();

  ContentSettingsForOneType settings;
  notification_service->GetNotificationsSettings(&settings);
  FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
      profile, Profile::EXPLICIT_ACCESS);
  favicon_tracker_.reset(new CancelableTaskTracker());
  patterns_.clear();
  for (ContentSettingsForOneType::const_iterator iter = settings.begin();
       iter != settings.end(); ++iter) {
    if (iter->primary_pattern == ContentSettingsPattern::Wildcard() &&
        iter->secondary_pattern == ContentSettingsPattern::Wildcard() &&
        iter->source != "preference") {
      continue;
    }

    std::string url_pattern = iter->primary_pattern.ToString();
    string16 name = UTF8ToUTF16(url_pattern);
    GURL url(url_pattern);
    NotifierId notifier_id(url);
    notifiers->push_back(new Notifier(
        notifier_id,
        name,
        notification_service->IsNotifierEnabled(notifier_id)));
    patterns_[name] = iter->primary_pattern;
    FaviconService::FaviconForURLParams favicon_params(
        profile, url, chrome::FAVICON | chrome::TOUCH_ICON,
        message_center::kSettingsIconSize);
    // Note that favicon service obtains the favicon from history. This means
    // that it will fail to obtain the image if there are no history data for
    // that URL.
    favicon_service->GetFaviconImageForURL(
        favicon_params,
        base::Bind(&MessageCenterSettingsController::OnFaviconLoaded,
                   base::Unretained(this), url),
        favicon_tracker_.get());
  }

  // Screenshot notification feature is only for ChromeOS. See crbug.com/238358
#if defined(OS_CHROMEOS)
  const string16 screenshot_name =
      l10n_util::GetStringUTF16(IDS_MESSAGE_CENTER_NOTIFIER_SCREENSHOT_NAME);
  NotifierId screenshot_notifier_id(NotifierId::SCREENSHOT);
  Notifier* const screenshot_notifier = new Notifier(
      screenshot_notifier_id,
      screenshot_name,
      notification_service->IsNotifierEnabled(screenshot_notifier_id));
  screenshot_notifier->icon =
      ui::ResourceBundle::GetSharedInstance().GetImageNamed(
          IDR_SCREENSHOT_NOTIFICATION_ICON);
  notifiers->push_back(screenshot_notifier);
#endif

  if (comparator) {
    std::sort(notifiers->begin() + app_count, notifiers->end(), *comparator);
  } else {
    std::sort(notifiers->begin() + app_count, notifiers->end(),
              SimpleCompareNotifiers);
  }
}

void MessageCenterSettingsController::SetNotifierEnabled(
    const Notifier& notifier,
    bool enabled) {
  // TODO(mukai): Fix this for multi-profile.
  Profile* profile = ProfileManager::GetDefaultProfile();
  DesktopNotificationService* notification_service =
      DesktopNotificationServiceFactory::GetForProfile(profile);

  if (notifier.notifier_id.type == NotifierId::WEB_PAGE) {
    // WEB_PAGE notifier cannot handle in DesktopNotificationService
    // since it has the exact URL pattern.
    // TODO(mukai): fix this.
    ContentSetting default_setting =
        notification_service->GetDefaultContentSetting(NULL);
    DCHECK(default_setting == CONTENT_SETTING_ALLOW ||
           default_setting == CONTENT_SETTING_BLOCK ||
           default_setting == CONTENT_SETTING_ASK);
    if ((enabled && default_setting != CONTENT_SETTING_ALLOW) ||
        (!enabled && default_setting == CONTENT_SETTING_ALLOW)) {
      if (notifier.notifier_id.url.is_valid()) {
        if (enabled)
          notification_service->GrantPermission(notifier.notifier_id.url);
        else
          notification_service->DenyPermission(notifier.notifier_id.url);
      } else {
        LOG(ERROR) << "Invalid url pattern: "
                   << notifier.notifier_id.url.spec();
      }
    } else {
      std::map<string16, ContentSettingsPattern>::const_iterator iter =
          patterns_.find(notifier.name);
      if (iter != patterns_.end()) {
        notification_service->ClearSetting(iter->second);
      } else {
        LOG(ERROR) << "Invalid url pattern: "
                   << notifier.notifier_id.url.spec();
      }
    }
  } else {
    notification_service->SetNotifierEnabled(notifier.notifier_id, enabled);
    if (notifier.notifier_id.type == NotifierId::SYNCED_NOTIFICATION_SERVICE) {
      notifier::ChromeNotifierService* notifier_service =
          notifier::ChromeNotifierServiceFactory::GetInstance()->GetForProfile(
              profile, Profile::EXPLICIT_ACCESS);
      notifier_service->OnSyncedNotificationServiceEnabled(
          notifier.notifier_id.id, enabled);
    }
  }
}

void MessageCenterSettingsController::OnNotifierSettingsClosing() {
  DCHECK(favicon_tracker_.get());
  favicon_tracker_->TryCancelAll();
  patterns_.clear();
}

void MessageCenterSettingsController::OnFaviconLoaded(
    const GURL& url,
    const chrome::FaviconImageResult& favicon_result) {
  FOR_EACH_OBSERVER(message_center::NotifierSettingsObserver,
                    observers_,
                    UpdateIconImage(NotifierId(url), favicon_result.image));
}


void MessageCenterSettingsController::SetAppImage(const std::string& id,
                                                  const gfx::ImageSkia& image) {
  FOR_EACH_OBSERVER(message_center::NotifierSettingsObserver,
                    observers_,
                    UpdateIconImage(NotifierId(NotifierId::APPLICATION, id),
                                    gfx::Image(image)));
}