// Copyright (c) 2009 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/extensions/extension_process_manager.h"

#include "chrome/browser/browsing_instance.h"
#include "chrome/browser/extensions/extension.h"
#include "chrome/browser/extensions/extension_host.h"
#include "chrome/browser/extensions/extension_view.h"
#include "chrome/browser/extensions/extensions_service.h"
#include "chrome/browser/profile.h"
#include "chrome/browser/tab_contents/site_instance.h"
#include "chrome/common/notification_service.h"

static void CreateBackgroundHosts(
    ExtensionProcessManager* manager, const ExtensionList* extensions) {
  for (ExtensionList::const_iterator extension = extensions->begin();
       extension != extensions->end(); ++extension) {
    // Start the process for the master page, if it exists.
    if ((*extension)->background_url().is_valid()) {
      manager->CreateBackgroundHost(*extension, (*extension)->background_url());
    }
  }
}

ExtensionProcessManager::ExtensionProcessManager(Profile* profile)
    : browsing_instance_(new BrowsingInstance(profile)) {
  // TODO: register notification, and load any hosts for existing exts.
  NotificationService::current()->AddObserver(this,
      NotificationType::EXTENSIONS_LOADED,
      NotificationService::AllSources());

  if (profile->GetExtensionsService()) {
    CreateBackgroundHosts(this, profile->GetExtensionsService()->extensions());
  }
}

ExtensionProcessManager::~ExtensionProcessManager() {
  for (ExtensionHostList::iterator iter = background_hosts_.begin();
      iter != background_hosts_.end(); ++iter) {
    delete *iter;
  }
}

ExtensionView* ExtensionProcessManager::CreateView(Extension* extension,
                                                   const GURL& url,
                                                   Browser* browser) {
  return new ExtensionView(
      new ExtensionHost(extension, GetSiteInstanceForURL(url)), browser, url);
}

void ExtensionProcessManager::CreateBackgroundHost(Extension* extension,
                                                   const GURL& url) {
  ExtensionHost* host =
      new ExtensionHost(extension, GetSiteInstanceForURL(url));
  host->CreateRenderView(url, NULL);  // create a RenderViewHost with no view
  background_hosts_.push_back(host);
}

SiteInstance* ExtensionProcessManager::GetSiteInstanceForURL(const GURL& url) {
  return browsing_instance_->GetSiteInstanceForURL(url);
}

void ExtensionProcessManager::Observe(NotificationType type,
                                      const NotificationSource& source,
                                      const NotificationDetails& details) {
  DCHECK(type == NotificationType::EXTENSIONS_LOADED);
  const ExtensionList* extensions = Details<ExtensionList>(details).ptr();
  CreateBackgroundHosts(this, extensions);
}