#define SCREEN_WIDTH 700
#define SCREEN_HEIGHT 600
#define TIMER_ID 100
#define ID_BUTTON1 1
#define ID_BUTTON2 2
#define ID_BUTTON3 3
#define ID_VALUEFIELD1 4
 
#include <windows.h>
#include <tchar.h>
 
TCHAR className[] = TEXT("NazwaKlasy");
TCHAR appName[] = TEXT("Stoperan");
 
HWND hwnd;
MSG msg;

void Ustaw_czas (HWND &hwnd, unsigned int milisekundy)
{
	unsigned int ms = 0, s = 0, min = 0;
	if (milisekundy / 60000 >= 1)
	{
		min = milisekundy / 60000;
		milisekundy = milisekundy - (60000 * min);
	}

	if (milisekundy / 1000 >= 1)
	{
		s = milisekundy / 1000;
		milisekundy = milisekundy - (1000* s);
	}

	ms = milisekundy;

	wchar_t Bufor[255];
	_swprintf (Bufor, L"%d : %d : %d", min , s , ms);
	SetWindowText (hwnd,Bufor);
}
 
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	static RECT R;
	static bool Odliczaj=false;
	static SYSTEMTIME czas, czas_odniesienia;
	static unsigned int ms = 0 ,s = 0,min = 0, czas_poprzedni = 0;
	static HWND ValueField, BUTTON3, BUTTON2, BUTTON1;
 
    switch (msg)
	{
        case WM_CREATE:
		{
			 SetTimer (hwnd,TIMER_ID, 1, NULL);
			 GetClientRect (hwnd,&R);

			 HINSTANCE &hInstance = ((LPCREATESTRUCT)lParam)->hInstance;

			 ValueField = CreateWindowEx (0,L"STATIC",L"00:00:000",WS_CHILD | WS_VISIBLE, 0, 0 , 0 ,0, hwnd, (HMENU)ID_VALUEFIELD1, hInstance,0);
			 if (ValueField==0)
			 {
				 MessageBox (hwnd,L"Problem z ValueField", className, MB_OK);
				 return 1;
			 }

			 BUTTON1 = CreateWindowEx (0,L"BUTTON",L"Start",WS_CHILD | WS_VISIBLE, 0, 0 , 0 ,0, hwnd, (HMENU)ID_BUTTON1, hInstance,0);
			 if (!BUTTON1)
			 {
				 MessageBox (hwnd,L"Problem z BUTTON1", className, MB_OK);
				 return 1;
			 }

			 BUTTON2 = CreateWindowEx (0,L"BUTTON",L"Stop",WS_CHILD | WS_VISIBLE, 0, 0 , 0 ,0, hwnd, (HMENU)ID_BUTTON2, hInstance,0);
			 if (!BUTTON2)
			 {
				 MessageBox (hwnd,L"Problem z BUTTON2", className, MB_OK);
				 return 1;
			 }

			 BUTTON3 = CreateWindowEx (0,L"BUTTON",L"Resetuj",WS_CHILD | WS_VISIBLE, 0, 0 , 0 ,0, hwnd, (HMENU)ID_BUTTON3, hInstance,0);
			 if (!BUTTON2)
			 {
				 MessageBox (hwnd,L"Problem z BUTTON3", className, MB_OK);
				 return 1;
			 }
        }break;
 
        case WM_TIMER:
		{
			if (Odliczaj)
			{
				GetLocalTime (&czas);
				
				ms = ms + ((czas.wMinute - czas_odniesienia.wMinute) * 60000 ) + ( (czas.wSecond - czas_odniesienia.wSecond) * 1000 ) + (czas.wMilliseconds - czas_odniesienia.wMilliseconds) - czas_poprzedni;
				czas_poprzedni = ( (czas.wMinute - czas_odniesienia.wMinute) * 60000 ) + ( (czas.wSecond - czas_odniesienia.wSecond) * 1000 ) + (czas.wMilliseconds - czas_odniesienia.wMilliseconds) ;
				Ustaw_czas (ValueField, ms);
			}
		}break;
 
        case WM_SIZE:
			{
            GetClientRect(hwnd, &R);         
            MoveWindow(ValueField, R.right / 3, R.bottom / 3, R.right / 7, R.bottom / 15, 1);
            MoveWindow(BUTTON1, R.right / 3, R.bottom / 2.5 + 10, R.right / 7, R.bottom / 15, 1);
            MoveWindow(BUTTON2, R.right / 2, R.bottom / 2.5 + 10, R.right / 7, R.bottom / 15, 1);
            MoveWindow(BUTTON3, R.right / 2, R.bottom / 3, R.right / 7, R.bottom / 15, 1);
            }break;
 
        case WM_GETMINMAXINFO:
            ((MINMAXINFO*)lParam)->ptMinTrackSize.x = 550;
            ((MINMAXINFO*)lParam)->ptMinTrackSize.y = 400;
			((MINMAXINFO*)lParam)->ptMaxTrackSize.x = 1000;
			((MINMAXINFO*)lParam)->ptMaxTrackSize.y = 900;
            break;
 
        case WM_COMMAND:
            switch (wParam)
			{
                case ID_BUTTON1:
                    czas_poprzedni = 0;
                    Odliczaj = true;
                    GetLocalTime(&czas_odniesienia);
                    break;
 
                case ID_BUTTON2:
                    Odliczaj = false;
                    break;
 
                case ID_BUTTON3:
                    ms = 0;
					czas_poprzedni = 0;
                    Odliczaj = false;
                    Ustaw_czas(ValueField, ms);
                    break;
            }break;
           
        case WM_CLOSE: 
            DestroyWindow(hwnd);   
            break;
 
        case WM_DESTROY:
			{
				KillTimer(hwnd, TIMER_ID);
				PostQuitMessage(0);
            }break;
 
        default:   
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpfnWndProc = WndProc;
    wc.lpszClassName = className;
    wc.lpszMenuName = NULL;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
 
    if (RegisterClassEx(&wc) == 0)
	{
        MessageBox(NULL, L"wc", className, MB_OK);
        return 1;
    }
 
    hwnd = CreateWindowEx(WS_EX_APPWINDOW | WS_EX_CLIENTEDGE, className, appName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, SCREEN_WIDTH, SCREEN_HEIGHT, 0, 0, hInstance, 0);
    if (hwnd == NULL)
	{
        MessageBox(NULL, L"hwnd", className, MB_OK);
        return 1;
    }
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    while (GetMessage(&msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
 
    UnregisterClass(className, hInstance);
 
    return msg.wParam;
}