#include <windows.h>
#include <windowsx.h>
#include <tchar.h>
#include <stdlib.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

VOID CALLBACK TimerEvent( HWND window, UINT Msg, UINT_PTR EventID, DWORD SYSTime);

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
	LPSTR lpCmdLine, int nCmdShow )
{
	MSG  msg ;    
	WNDCLASS wc;
	ZeroMemory(&wc, sizeof(wc));

	wc.lpszClassName = TEXT( "Timer" );
	wc.hInstance     = hInstance ;
	wc.hbrBackground = CreateSolidBrush(RGB(0,0,0));
	wc.lpfnWndProc   = WndProc ;
	wc.hCursor       = LoadCursor(0, IDC_ARROW);


	RegisterClass(&wc);
	CreateWindow( wc.lpszClassName, TEXT("Stop Watch"),
		WS_SYSMENU | WS_VISIBLE,
		150, 150, 230, 230, 0, 0, hInstance, 0);  

	while( GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return (int) msg.wParam;
}

int GlobTime = 0;

LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
	static HWND MenuItems[3] = {0};

	switch(msg)  
	{
	case WM_CREATE:
		{
			MenuItems[0] = CreateWindow(TEXT("button"), TEXT("Старт"),    
				WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,
				120, 150, 80, 25,        
				hwnd, (HMENU) 1, NULL, NULL);  

			MenuItems[1] = CreateWindow(TEXT("button"), TEXT("Стоп"),    
				WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,
				20, 150, 80, 25,        
				hwnd, (HMENU) 2, NULL, NULL);

			MenuItems[2] = CreateWindow(TEXT("button"), NULL,    
				WS_VISIBLE | WS_CHILD | BS_GROUPBOX,
				20, 15, 180, 120,        
				hwnd, (HMENU) 3, NULL, NULL);

			break;
		}

	case WM_COMMAND:
		{
			if(HIWORD(wParam) == BN_CLICKED)
			{
				if (LOWORD(wParam) == 1) 
				{
					GlobTime = 0;
					KillTimer(hwnd, 1);
					SetTimer(hwnd, 1, 1000, TimerEvent);
				} 
				else if(LOWORD(wParam) == 2)
				{
					GlobTime = 0;
					InvalidateRect(hwnd, 0, false);
					KillTimer(hwnd, 1);
				}
			}
			break;
		}
	case WM_PAINT:
		{
			PAINTSTRUCT ps;

			HDC hd = BeginPaint((HWND)MenuItems[2], &ps);

			HFONT hfontMSSS = CreateFont (80,40,FW_DONTCARE,FW_DONTCARE,FW_BOLD,
				FALSE,FALSE,FALSE,ANSI_CHARSET,OUT_DEFAULT_PRECIS,
				CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,FF_DONTCARE,L"System");

			SelectFont(hd, hfontMSSS);
			SetTextColor(hd, RGB(255,0,0));
			SetBkColor(hd, RGB(0,0,0));

			TCHAR timeNow[6] = {0}, csec[3] = {0}, cmin[3] = {0};
			int sec = GlobTime, mins = GlobTime;

			do
			{
				if(sec - 60 < 0 && sec != 0)
				{
					wsprintfW(csec, sec > 9 ? L"%d" : L"0%d", sec);
					break;
				}
				else if(!sec)
				{
					wcscat(csec, L"00");
					break;
				}
				
				sec -= 60;
			} while (1);

			//wcscat(timeNow, L":");

			if(GlobTime - sec == 0)
			{
				wcscat(cmin, L"00");
			}
			else
			{
				wsprintfW(cmin, (GlobTime - sec) / 60 > 9 ? L"%d" : L"0%d", (GlobTime - sec) / 60);
			}

			wsprintf(timeNow, L"%s:%s", cmin, csec);


			TextOut(hd, 0, 10, timeNow, _tcslen(timeNow));
			EndPaint(hwnd, &ps);
			break;
		}
	case WM_DESTROY:
		{
			KillTimer(hwnd, 1);
			PostQuitMessage(0);
			break;
		}
	}
	return DefWindowProc(hwnd, msg, wParam, lParam);
}

VOID CALLBACK TimerEvent( HWND window, UINT Msg, UINT_PTR EventID, DWORD SYSTime)
{
	if(++GlobTime > 60 * 60 - 1) GlobTime = 0;
	InvalidateRect(window, 0, false);
}