// 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/notifications/message_center_notification_manager.h"

#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/prefs/pref_service.h"
#include "chrome/browser/extensions/extension_info_map.h"
#include "chrome/browser/extensions/extension_system.h"
#include "chrome/browser/notifications/desktop_notification_service.h"
#include "chrome/browser/notifications/desktop_notification_service_factory.h"
#include "chrome/browser/notifications/message_center_settings_controller.h"
#include "chrome/browser/notifications/notification.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/chrome_pages.h"
#include "chrome/browser/ui/host_desktop.h"
#include "chrome/common/extensions/extension_set.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/url_constants.h"
#include "ui/message_center/message_center_style.h"
#include "ui/message_center/message_center_tray.h"
#include "ui/message_center/notifier_settings.h"

MessageCenterNotificationManager::MessageCenterNotificationManager(
    message_center::MessageCenter* message_center)
    : message_center_(message_center),
      settings_controller_(new MessageCenterSettingsController) {
  message_center_->SetDelegate(this);
  message_center_->AddObserver(this);
  message_center_->SetNotifierSettingsProvider(settings_controller_.get());

#if defined(OS_WIN) || defined(OS_MACOSX) \
  || (defined(USE_AURA) && !defined(USE_ASH))
  // On Windows, Linux and Mac, the notification manager owns the tray icon and
  // views.Other platforms have global ownership and Create will return NULL.
  tray_.reset(message_center::CreateMessageCenterTray());
#endif
}

MessageCenterNotificationManager::~MessageCenterNotificationManager() {
  message_center_->RemoveObserver(this);
}


////////////////////////////////////////////////////////////////////////////////
// NotificationUIManager

bool MessageCenterNotificationManager::DoesIdExist(const std::string& id) {
  if (NotificationUIManagerImpl::DoesIdExist(id))
    return true;
  NotificationMap::iterator iter = profile_notifications_.find(id);
  if (iter == profile_notifications_.end())
    return false;
  return true;
}

bool MessageCenterNotificationManager::CancelById(const std::string& id) {
  // See if this ID hasn't been shown yet.
  if (NotificationUIManagerImpl::CancelById(id))
    return true;

  // If it has been shown, remove it.
  NotificationMap::iterator iter = profile_notifications_.find(id);
  if (iter == profile_notifications_.end())
    return false;

  message_center_->RemoveNotification(id, /* by_user */ false);
  return true;
}

std::set<std::string>
MessageCenterNotificationManager::GetAllIdsByProfileAndSourceOrigin(
    Profile* profile,
    const GURL& source) {

  std::set<std::string> notification_ids =
      NotificationUIManagerImpl::GetAllIdsByProfileAndSourceOrigin(profile,
                                                                   source);

  for (NotificationMap::iterator iter = profile_notifications_.begin();
       iter != profile_notifications_.end(); iter++) {
    if ((*iter).second->notification().origin_url() == source &&
        profile->IsSameProfile((*iter).second->profile())) {
      notification_ids.insert(iter->first);
    }
  }
  return notification_ids;
}

bool MessageCenterNotificationManager::CancelAllBySourceOrigin(
    const GURL& source) {
  // Same pattern as CancelById, but more complicated than the above
  // because there may be multiple notifications from the same source.
  bool removed = NotificationUIManagerImpl::CancelAllBySourceOrigin(source);

  for (NotificationMap::iterator loopiter = profile_notifications_.begin();
       loopiter != profile_notifications_.end(); ) {
    NotificationMap::iterator curiter = loopiter++;
    if ((*curiter).second->notification().origin_url() == source) {
      message_center_->RemoveNotification(curiter->first, /* by_user */ false);
      removed = true;
    }
  }
  return removed;
}

bool MessageCenterNotificationManager::CancelAllByProfile(Profile* profile) {
  // Same pattern as CancelAllBySourceOrigin.
  bool removed = NotificationUIManagerImpl::CancelAllByProfile(profile);

  for (NotificationMap::iterator loopiter = profile_notifications_.begin();
       loopiter != profile_notifications_.end(); ) {
    NotificationMap::iterator curiter = loopiter++;
    if (profile->IsSameProfile((*curiter).second->profile())) {
      message_center_->RemoveNotification(curiter->first, /* by_user */ false);
      removed = true;
    }
  }
  return removed;
}

void MessageCenterNotificationManager::CancelAll() {
  NotificationUIManagerImpl::CancelAll();

  message_center_->RemoveAllNotifications(/* by_user */ false);
}

////////////////////////////////////////////////////////////////////////////////
// NotificationUIManagerImpl

bool MessageCenterNotificationManager::ShowNotification(
    const Notification& notification, Profile* profile) {
  if (message_center_->IsMessageCenterVisible())
    return false;

  if (UpdateNotification(notification, profile))
    return true;

  AddProfileNotification(
      new ProfileNotification(profile, notification, message_center_));
  return true;
}

bool MessageCenterNotificationManager::UpdateNotification(
    const Notification& notification, Profile* profile) {
  if (message_center_->IsMessageCenterVisible())
    return false;

  const string16& replace_id = notification.replace_id();
  if (replace_id.empty())
    return false;

  const GURL origin_url = notification.origin_url();
  DCHECK(origin_url.is_valid());

  // Since replace_id is provided by arbitrary JS, we need to use origin_url
  // (which is an app url in case of app/extension) to scope the replace ids
  // in the given profile.
  for (NotificationMap::iterator iter = profile_notifications_.begin();
       iter != profile_notifications_.end(); ++iter) {
    ProfileNotification* old_notification = (*iter).second;
    if (old_notification->notification().replace_id() == replace_id &&
        old_notification->notification().origin_url() == origin_url &&
        old_notification->profile()->IsSameProfile(profile)) {
      std::string old_id =
          old_notification->notification().notification_id();
      DCHECK(message_center_->HasNotification(old_id));

      // Add/remove notification in the local list but just update the same
      // one in MessageCenter.
      old_notification->notification().Close(false); // Not by user.
      delete old_notification;
      profile_notifications_.erase(old_id);
      ProfileNotification* new_notification =
          new ProfileNotification(profile, notification, message_center_);
      profile_notifications_[notification.notification_id()] = new_notification;

      // Now pass a copy to message center.
      scoped_ptr<message_center::Notification> message_center_notification(
          make_scoped_ptr(new message_center::Notification(notification)));
      message_center_notification->set_extension_id(
          new_notification->GetExtensionId());
      message_center_->UpdateNotification(old_id,
                                          message_center_notification.Pass());

      new_notification->StartDownloads();
      return true;
    }
  }
  return false;
}

////////////////////////////////////////////////////////////////////////////////
// MessageCenter::Delegate

void MessageCenterNotificationManager::DisableExtension(
    const std::string& notification_id) {
  ProfileNotification* profile_notification =
      FindProfileNotification(notification_id);
  if (!profile_notification)
    return;

  std::string extension_id = profile_notification->GetExtensionId();
  DCHECK(!extension_id.empty());  // or UI should not have enabled the command.
  DesktopNotificationService* service =
      DesktopNotificationServiceFactory::GetForProfile(
          profile_notification->profile());
  service->SetExtensionEnabled(extension_id, false);
}

void MessageCenterNotificationManager::DisableNotificationsFromSource(
    const std::string& notification_id) {
  ProfileNotification* profile_notification =
      FindProfileNotification(notification_id);
  if (!profile_notification)
    return;

  // UI should not have enabled the command if there is no valid source.
  DCHECK(profile_notification->notification().origin_url().is_valid());
  DesktopNotificationService* service =
      DesktopNotificationServiceFactory::GetForProfile(
          profile_notification->profile());
  if (profile_notification->notification().origin_url().scheme() ==
      chrome::kChromeUIScheme) {
    const std::string name =
        profile_notification->notification().origin_url().host();
    const message_center::Notifier::SystemComponentNotifierType type =
        message_center::ParseSystemComponentName(name);
    service->SetSystemComponentEnabled(type, false);
  } else {
    service->DenyPermission(profile_notification->notification().origin_url());
  }
}

void MessageCenterNotificationManager::ShowSettings(
    const std::string& notification_id) {
  // The per-message-center Settings button passes an empty string.
  if (notification_id.empty()) {
    NOTIMPLEMENTED();
    return;
  }

  ProfileNotification* profile_notification =
      FindProfileNotification(notification_id);
  if (!profile_notification)
    return;

  Browser* browser =
      chrome::FindOrCreateTabbedBrowser(profile_notification->profile(),
                                        chrome::HOST_DESKTOP_TYPE_NATIVE);
  if (profile_notification->GetExtensionId().empty())
    chrome::ShowContentSettings(browser, CONTENT_SETTINGS_TYPE_NOTIFICATIONS);
  else
    chrome::ShowExtensions(browser, std::string());
}

////////////////////////////////////////////////////////////////////////////////
// MessageCenter::Observer
void MessageCenterNotificationManager::OnNotificationRemoved(
    const std::string& notification_id,
    bool by_user) {
  // Do not call FindProfileNotification(). Some tests create notifications
  // directly to MessageCenter, but this method will be called for the removals
  // of such notifications.
  NotificationMap::const_iterator iter =
      profile_notifications_.find(notification_id);
  if (iter != profile_notifications_.end())
    RemoveProfileNotification(iter->second, by_user);
}

void MessageCenterNotificationManager::OnNotificationCenterClosed() {
  // When the center is open it halts all notifications, so we need to listen
  // for events indicating it's been closed.
  CheckAndShowNotifications();
}

////////////////////////////////////////////////////////////////////////////////
// ImageDownloads

MessageCenterNotificationManager::ImageDownloads::ImageDownloads(
    message_center::MessageCenter* message_center,
    ImageDownloadsObserver* observer)
    : message_center_(message_center),
      pending_downloads_(0),
      observer_(observer) {
}

MessageCenterNotificationManager::ImageDownloads::~ImageDownloads() { }

void MessageCenterNotificationManager::ImageDownloads::StartDownloads(
    const Notification& notification) {
  // In case all downloads are synchronous, assume a pending download.
  AddPendingDownload();

  // Notification primary icon.
  StartDownloadWithImage(
      notification,
      &notification.icon(),
      notification.icon_url(),
      message_center::kNotificationIconSize,
      base::Bind(&message_center::MessageCenter::SetNotificationIcon,
                 base::Unretained(message_center_),
                 notification.notification_id()));

  // Notification image.
  StartDownloadWithImage(
      notification,
      NULL,
      notification.image_url(),
      message_center::kNotificationPreferredImageSize,
      base::Bind(&message_center::MessageCenter::SetNotificationImage,
                 base::Unretained(message_center_),
                 notification.notification_id()));

  // Notification button icons.
  StartDownloadWithImage(
      notification,
      NULL,
      notification.button_one_icon_url(),
      message_center::kNotificationButtonIconSize,
      base::Bind(&message_center::MessageCenter::SetNotificationButtonIcon,
                 base::Unretained(message_center_),
                 notification.notification_id(),
                 0));
  StartDownloadWithImage(
      notification,
      NULL,
      notification.button_two_icon_url(),
      message_center::kNotificationButtonIconSize,
      base::Bind(&message_center::MessageCenter::SetNotificationButtonIcon,
                 base::Unretained(message_center_),
                 notification.notification_id(),
                 1));

  // This should tell the observer we're done if everything was synchronous.
  PendingDownloadCompleted();
}

void MessageCenterNotificationManager::ImageDownloads::StartDownloadWithImage(
    const Notification& notification,
    const gfx::Image* image,
    const GURL& url,
    int size,
    const SetImageCallback& callback) {
  // Set the image directly if we have it.
  if (image && !image->IsEmpty()) {
    callback.Run(*image);
    return;
  }

  // Leave the image null if there's no URL.
  if (url.is_empty())
    return;

  content::RenderViewHost* host = notification.GetRenderViewHost();
  if (!host) {
    LOG(WARNING) << "Notification needs an image but has no RenderViewHost";
    return;
  }

  content::WebContents* contents =
      content::WebContents::FromRenderViewHost(host);
  if (!contents) {
    LOG(WARNING) << "Notification needs an image but has no WebContents";
    return;
  }

  AddPendingDownload();

  contents->DownloadImage(
      url,
      false,  // Not a favicon
      size,  // Preferred size
      0,  // No maximum size
      base::Bind(
          &MessageCenterNotificationManager::ImageDownloads::DownloadComplete,
          AsWeakPtr(),
          callback));
}

void MessageCenterNotificationManager::ImageDownloads::DownloadComplete(
    const SetImageCallback& callback,
    int download_id,
    int http_status_code,
    const GURL& image_url,
    int requested_size,
    const std::vector<SkBitmap>& bitmaps) {
  PendingDownloadCompleted();

  if (bitmaps.empty())
    return;
  gfx::Image image = gfx::Image::CreateFrom1xBitmap(bitmaps[0]);
  callback.Run(image);
}

// Private methods.

void MessageCenterNotificationManager::ImageDownloads::AddPendingDownload() {
  ++pending_downloads_;
}

void
MessageCenterNotificationManager::ImageDownloads::PendingDownloadCompleted() {
  DCHECK(pending_downloads_ > 0);
  if (--pending_downloads_ == 0 && observer_)
    observer_->OnDownloadsCompleted();
}

////////////////////////////////////////////////////////////////////////////////
// ProfileNotification

MessageCenterNotificationManager::ProfileNotification::ProfileNotification(
    Profile* profile,
    const Notification& notification,
    message_center::MessageCenter* message_center)
    : profile_(profile),
      notification_(notification),
      downloads_(new ImageDownloads(message_center, this)) {
  DCHECK(profile);
}

MessageCenterNotificationManager::ProfileNotification::~ProfileNotification() {
}

void MessageCenterNotificationManager::ProfileNotification::StartDownloads() {
  downloads_->StartDownloads(notification_);
}

void
MessageCenterNotificationManager::ProfileNotification::OnDownloadsCompleted() {
  notification_.DoneRendering();
}

std::string
    MessageCenterNotificationManager::ProfileNotification::GetExtensionId() {
  ExtensionInfoMap* extension_info_map =
      extensions::ExtensionSystem::Get(profile())->info_map();
  ExtensionSet extensions;
  extension_info_map->GetExtensionsWithAPIPermissionForSecurityOrigin(
      notification().origin_url(), notification().process_id(),
      extensions::APIPermission::kNotification, &extensions);

  DesktopNotificationService* desktop_service =
      DesktopNotificationServiceFactory::GetForProfile(profile());
  for (ExtensionSet::const_iterator iter = extensions.begin();
       iter != extensions.end(); ++iter) {
    if (desktop_service->IsExtensionEnabled((*iter)->id()))
      return (*iter)->id();
  }
  return std::string();
}

////////////////////////////////////////////////////////////////////////////////
// private

void MessageCenterNotificationManager::AddProfileNotification(
    ProfileNotification* profile_notification) {
  const Notification& notification = profile_notification->notification();
  std::string id = notification.notification_id();
  // Notification ids should be unique.
  DCHECK(profile_notifications_.find(id) == profile_notifications_.end());
  profile_notifications_[id] = profile_notification;

  // Create the copy for message center, and ensure the extension ID is correct.
  scoped_ptr<message_center::Notification> message_center_notification(
      new message_center::Notification(notification));
  message_center_notification->set_extension_id(
      profile_notification->GetExtensionId());
  message_center_->AddNotification(message_center_notification.Pass());

  profile_notification->StartDownloads();
}

void MessageCenterNotificationManager::RemoveProfileNotification(
    ProfileNotification* profile_notification,
    bool by_user) {
  profile_notification->notification().Close(by_user);
  std::string id = profile_notification->notification().notification_id();
  profile_notifications_.erase(id);
  delete profile_notification;
}

MessageCenterNotificationManager::ProfileNotification*
    MessageCenterNotificationManager::FindProfileNotification(
        const std::string& id) const {
  NotificationMap::const_iterator iter = profile_notifications_.find(id);
  if (iter == profile_notifications_.end())
    return NULL;

  return (*iter).second;
}