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#include <windows.h>

LRESULT CALLBACK WndProc(HWND hWnd,
						 UINT uMsg,
						 WPARAM wParam,
						 LPARAM lParam);

int WINAPI wWinMain(HINSTANCE hInstance,
					HINSTANCE hPrevInstance,
					LPWSTR lpCmdLine,
					int iCmdShow)
{
	//Name of the window class
	LPWSTR lpszWindowClass = L"HelloWorld";

	//window class struct
	WNDCLASS wc = { };

	wc.lpfnWndProc = WndProc;				//Window callback function
	wc.lpszClassName  = lpszWindowClass;	//Name of the window class
	wc.hInstance = hInstance;				//Instance that calls the window

	//Register the class and inform the user wether or not it succeeded
	if( !RegisterClass(&wc) )
	{
		MessageBox(NULL,
				   L"Class Not Registered!",
				   L"ERROR!",
				   MB_OK | MB_ICONERROR);
	}
	
	//Create the window
	HWND hWnd;
	hWnd = CreateWindow(lpszWindowClass,
						L"Hello World!",
						WS_OVERLAPPEDWINDOW,
						CW_USEDEFAULT,
						CW_USEDEFAULT,
						CW_USEDEFAULT,
						CW_USEDEFAULT,
						NULL,
						NULL,
						hInstance,
						NULL);

	if(hWnd==NULL)
	{
		MessageBox(NULL,
				   L"Window Not Created!",
				   L"ERROR!",
				   MB_OK | MB_ICONERROR);
		return 0;
	}

	//show the window
	ShowWindow(hWnd, iCmdShow);
	UpdateWindow(hWnd);

	//create the message loop
	MSG msg;
	while( GetMessage(&msg, NULL, 0, 0) )
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;


	return 0;
}

LRESULT CALLBACK WndProc(HWND hWnd,
						 UINT uMsg,
						 WPARAM wParam,
						 LPARAM lParam)
{
	switch(uMsg)
	{
	case WM_PAINT:
		HDC hdc;
		PAINTSTRUCT ps;
		RECT rect;
		
		hdc = BeginPaint(hWnd, &ps);
		GetClientRect(hWnd, &rect);
		DrawText(hdc,
				 L"Hello World!",
				 -1,
				 &rect,
				 DT_SINGLELINE | DT_CENTER | DT_VCENTER);

		EndPaint(hWnd, &ps);
		return 0;

	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}
	return 0;
}