// Copyright 2008, Google Inc.
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "chrome/browser/suspend_controller.h"

#include "base/logging.h"
#include "base/message_loop.h"
#include "base/task.h"
#include "base/thread.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profile.h"
#include "chrome/browser/resource_dispatcher_host.h"
#include "chrome/browser/safe_browsing/safe_browsing_service.h"
#include "net/url_request/url_request_job.h"
#include "net/url_request/url_request_job_tracker.h"

// Static member.
bool SuspendController::is_suspended_ = false;

// Static method.
void SuspendController::OnSuspend(Profile* profile) {
  if (is_suspended_)
    return;
  is_suspended_ = true;

  LOG(INFO) << "Received APM suspend message";

  SuspendController* controller = g_browser_process->suspend_controller();

  MessageLoop* io_loop = g_browser_process->io_thread()->message_loop();
  io_loop->PostTask(FROM_HERE,
      NewRunnableMethod(controller,
                        &SuspendController::StopRequests,
                        profile));

  ResourceDispatcherHost* rdh = g_browser_process->resource_dispatcher_host();
  SafeBrowsingService* safe_browsing_service = rdh->safe_browsing_service();
  io_loop->PostTask(FROM_HERE,
      NewRunnableMethod(safe_browsing_service,
                        &SafeBrowsingService::OnSuspend));
}

// Static method.
void SuspendController::OnResume(Profile* profile) {
  if (!is_suspended_)
    return;
  is_suspended_ = false;

  LOG(INFO) << "Received APM resume message";

  SuspendController* controller = g_browser_process->suspend_controller();

  MessageLoop* io_loop = g_browser_process->io_thread()->message_loop();
  io_loop->PostTask(FROM_HERE,
      NewRunnableMethod(controller,
                        &SuspendController::AllowNewRequests,
                        profile));

  ResourceDispatcherHost* rdh = g_browser_process->resource_dispatcher_host();
  SafeBrowsingService* safe_browsing_service = rdh->safe_browsing_service();
  io_loop->PostTask(FROM_HERE,
      NewRunnableMethod(safe_browsing_service,
                        &SafeBrowsingService::OnResume));
}

void SuspendController::StopRequests(Profile* profile) {
  // Cancel all requests and stop creating new ones.
  URLRequestJobTracker::JobIterator it = g_url_request_job_tracker.begin();
  for (;it != g_url_request_job_tracker.end(); ++it) {
    URLRequestJob* job = const_cast<URLRequestJob*>(*it);
    job->Kill();
  }

  // Close the network session.
  profile->GetRequestContext()->http_transaction_factory()->Suspend(true);
}

void SuspendController::AllowNewRequests(Profile* profile) {
  // Re-enable the network session.
  profile->GetRequestContext()->http_transaction_factory()->Suspend(false);
}