/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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 the Mozilla browser.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications, Inc.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Travis Bogard <travis@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsIServiceManager.h"
#include "nsCOMPtr.h"
#include "nsCNativeApp.h"
#include "nsIEventLoop.h"
#include <windows.h>

static NS_DEFINE_CID(kNativeAppCID, NS_NATIVE_APP_CID);

LRESULT CALLBACK WndProc(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam);

void ErrorBox(LPSTR text)
{
	MessageBox(NULL, text, "XP Event Loop", MB_OK | MB_ICONSTOP);
}

void InfoBox(LPSTR text)
{
	MessageBox(NULL, text, "XP Event Loop", MB_OK | MB_ICONINFORMATION);
}

int WINAPI WinMain(HINSTANCE inst, 
                   HINSTANCE prevInstance, 
                   LPSTR lpszCmdLine,
                   int nShowCmd)
{
	char* lpszAppName = "HelloWorld";
	HWND wnd;
	WNDCLASSEX wndclass;
	int retCode;

    {	//  Needed to scope all nsCOMPtr within XPCOM Init and Shutdown
      nsresult rv;
      nsCOMPtr<nsIServiceManager> servMan;
      rv = NS_InitXPCOM2(getter_AddRefs(servMan), nsnull, nsnull);
      if(NS_FAILED(rv))
      {
        ErrorBox("Failed to initalize xpcom.");
        return -1;
      }
      
      nsCOMPtr<nsIComponentRegistrar> registrar = do_QueryInterface(servMan);
      NS_ASSERTION(registrar, "Null nsIComponentRegistrar");
      registrar->AutoRegister(nsnull);
      
      nsCOMPtr<nsINativeApp> nativeAppService(do_GetService(kNativeAppCID, &rv));

      if(NS_FAILED(rv))
      {
        ErrorBox("Failed to get nativeAppService");
        return -1;
      }
      wndclass.cbSize        = sizeof(wndclass);
      wndclass.style         = CS_HREDRAW | CS_VREDRAW;
      wndclass.lpfnWndProc   = WndProc;
      wndclass.cbClsExtra    = 0;
      wndclass.cbWndExtra    = 0;
      wndclass.hInstance     = inst;
      wndclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
      wndclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
      wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
      wndclass.lpszMenuName  = NULL;
      wndclass.lpszClassName = lpszAppName;
      wndclass.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

      RegisterClassEx(&wndclass) ;
      
      wnd = CreateWindow(lpszAppName, "The Hello World",
                         WS_OVERLAPPEDWINDOW,
                         CW_USEDEFAULT, CW_USEDEFAULT,
                         CW_USEDEFAULT, CW_USEDEFAULT,
                         NULL, NULL, inst, NULL);		     
      
      ShowWindow(wnd, nShowCmd);
      UpdateWindow(wnd);
      
      nsCOMPtr<nsIEventLoop> eventLoop;
      
      if(NS_FAILED(nativeAppService->CreateEventLoop(L"_MainLoop", 
                                                     nsEventLoopTypes::MainAppLoop, getter_AddRefs(eventLoop))))
        {
          ErrorBox("Failed to create event Loop");
          return 0;
        } 
      
      eventLoop->Run(nsnull, nsnull, nsnull, &retCode);
      eventLoop = nsnull; // Clear out before Shutting down XPCOM
      
      InfoBox("Hello World app is out of loop");
    }
	NS_ShutdownXPCOM(nsnull);
	InfoBox("Hello World app is exiting");
	return retCode;
}

LRESULT CALLBACK WndProc(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	HDC         hdc;
	PAINTSTRUCT ps;
	RECT        rect;

	switch(msg)
		{
		case WM_PAINT:
			hdc = BeginPaint(wnd, &ps);

			GetClientRect(wnd, &rect);

			DrawText(hdc, "Hello, XP Event Loop!", -1, &rect,
					 DT_SINGLELINE | DT_CENTER | DT_VCENTER);

			EndPaint(wnd, &ps);
			return 0;

		case WM_DESTROY:
			{
			nsresult rv;
			nsCOMPtr<nsINativeApp> nativeAppService = 
			         do_GetService(kNativeAppCID, &rv);
			if(NS_FAILED(rv))
				{
				ErrorBox("Could not get NativeAppService");
				return 0;
				}
			nsCOMPtr<nsIEventLoop> eventLoop;

			if(NS_FAILED(nativeAppService->FindEventLoop(L"_MainLoop", 
				getter_AddRefs(eventLoop))))
				{
				ErrorBox("Failed to find event Loop");
				return 0;
				}
			eventLoop->Exit(0);
			}
			return 0;
		}

	return DefWindowProc(wnd, msg, wParam, lParam);
}