/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is mozilla.org code.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 2001 Netscape Communications Corporation.
 * All Rights Reserved.
 * 
 * Contributor(s):
 *   Stuart Parmenter <pavlov@netscape.com>
 */

#include "imgThread.h"

#include "nsIEventQueueService.h"

#include "nsIComponentManager.h"
#include "nsIServiceManager.h"

#include "prlock.h"

#include "nsAutoLock.h"

NS_IMPL_THREADSAFE_ISUPPORTS1(imgThread, nsIRunnable)

imgThread::imgThread()
{
  NS_INIT_ISUPPORTS();
  /* member initializers and constructor code */
  mLock = PR_NewLock();
  mMonitor = PR_NewMonitor(); 
}

imgThread::~imgThread()
{
  /* destructor code */
  PR_DestroyLock(mLock);
  PR_DestroyMonitor(mMonitor);
}

nsresult imgThread::Init()
{
  if (!mThread) {
    nsresult rv = NS_NewThread(getter_AddRefs(mThread),
                               NS_STATIC_CAST(nsIRunnable*, this),
                               0,
                               PR_UNJOINABLE_THREAD,
                               PR_PRIORITY_NORMAL,
                               PR_GLOBAL_THREAD);
    if (NS_FAILED(rv))
      return rv;
  }

  return NS_OK;
}

nsresult imgThread::GetEventQueue(nsIEventQueue **aEventQueue)
{
  PR_EnterMonitor(mMonitor);

  if (!mEventQueue)
    PR_Wait(mMonitor, PR_INTERVAL_NO_TIMEOUT);

  *aEventQueue = mEventQueue;
  NS_ADDREF(*aEventQueue);

  PR_ExitMonitor(mMonitor);
  return NS_OK;
}


/** nsIRunnable methods **/

/* void Run(); */
NS_IMETHODIMP imgThread::Run()
{
  nsresult rv;

  nsCOMPtr<nsIEventQueue> currentThreadQ;

  PR_EnterMonitor(mMonitor);

  nsCOMPtr<nsIEventQueueService> eventService(do_GetService("@mozilla.org/event-queue-service;1", &rv));
  if (NS_FAILED(rv)) return rv;

  rv = eventService->CreateMonitoredThreadEventQueue();
  if (NS_FAILED(rv)) return rv;

  rv = eventService->GetThreadEventQueue(NS_CURRENT_THREAD, getter_AddRefs(mEventQueue));

  NS_ASSERTION(NS_SUCCEEDED(rv), "unable to create event queue");
  if (NS_FAILED(rv)) return rv;

  PR_Notify(mMonitor);

  PR_ExitMonitor(mMonitor);

  PLEvent *event;
  while (1) {
     rv = mEventQueue->WaitForEvent(&event);
     if (NS_FAILED(rv)) return rv;

     rv = mEventQueue->HandleEvent(event);
     if (NS_FAILED(rv)) return rv;
  }

  rv = eventService->DestroyThreadEventQueue();
  if (NS_FAILED(rv)) return rv;

  mEventQueue = nsnull;

  return NS_OK;
}