/////////////////////////////////////////////////////////////////
//                                                             //
//  minwin.cpp  -  small windows demo program                  //
//                                                             //
//  Creates a movable, resizable window with title and         //
//  system menu, and a brief message.                          //
//                                                             //
//  Jim Fawcett, 27 July 1998, modified 20 Sep 2000            //
//  Ref:  Programming Windows, Fifth Edition, Charles Petzold  //
//        Microsoft Press, 1999                                //
/////////////////////////////////////////////////////////////////

#include <windows.h>
#include <cstring>

HWND  hWnd;     // handle to window created in InitInstance
HANDLE hInst;   // handle to current module

//----< process windows messages >-----------------------------

LRESULT CALLBACK WinProc(HWND hWnd, UINT message, 
                              WPARAM wParam, LPARAM lParam) {

  HDC hDC;          // device context
  RECT rect;        // will hold dimensions of client area
  PAINTSTRUCT ps;   // used by Windows to hold painting information

  const char *msg1 = "CSE681 - Software Modeling and Analysis";
  const char *msg2 = "Hello World";
  switch(message) {
  case WM_PAINT :
    hDC = BeginPaint(hWnd,&ps);
    GetClientRect(hWnd,&rect);
    DrawText(
      hDC,msg2,strlen(msg2),&rect,
      DT_CENTER | DT_SINGLELINE | DT_VCENTER
    );
    TextOut(hDC,30,30,msg1,strlen(msg1));
    MoveToEx(hDC,25,50,NULL);
    LineTo(hDC,315,50);
    EndPaint(hWnd, &ps);
    break;
  case WM_LBUTTONDOWN:
    MessageBox(
      hWnd,"left mouse button clicked","Response to WM_LBUTTON",MB_OK
    );
    break;
  case WM_DESTROY:
    PostQuitMessage(0);
    break;
  default :
    return(DefWindowProc(hWnd,message, wParam, lParam));
  }
  return (NULL);
}

//

//----< define and register window "class" >-------------------

BOOL InitApplication(HINSTANCE hInstance) {

// define window data in WNDCLASS struct and register
  WNDCLASS wc;
  wc.style = NULL;                  // default style
  wc.lpfnWndProc = WinProc;         // name of function handling messages
  wc.cbClsExtra  = 0;               // no per-class user-defined data
  wc.cbWndExtra  = 0;               // no per-window user-defined data
  wc.hInstance   = hInstance;       // application attached to this class
  wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
  wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
  wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
  wc.lpszMenuName  = NULL;          // menu name
  wc.lpszClassName = "BasicWindow"; // name of this "class"
  return (RegisterClass(&wc));
}

//----< create and display window >----------------------------

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) {
 
  hInst = hInstance;
  hWnd = CreateWindow(
    "BasicWindow",                  // "class" to use when creating
    "CSE681 - Basic Window",        // window title
    WS_OVERLAPPEDWINDOW,            // window style
    CW_USEDEFAULT,                  // default horizontal position
    CW_USEDEFAULT,                  // default vertical position
    400,                            // 200 pixels wide
    300,                            // 150 pixels high
//  CW_USEDEFAULT,                  // default width
//  CW_USEDEFAULT,                  // default height
    NULL,                           // no parent window
    NULL,                           // use window class menu
    hInstance,                      // owner of window
    NULL);

  if(!hWnd) return FALSE;
  ShowWindow(hWnd, nCmdShow);
  UpdateWindow(hWnd);
  return (TRUE);
}

//----< collect and dispatch windows messages >----------------

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow) {

  MSG msg;
  if(!hPrevInstance) {                // is this first instance?
    if(!InitApplication(hInstance))   // 
      return (FALSE);                 // can't initialize window
  }
  if(!InitInstance(hInstance, nCmdShow))
    return (FALSE);
  while(GetMessage(&msg, NULL, NULL, NULL)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return (msg.wParam);
}