#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;

	TCHAR Bufor[255];
	wsprintf(Bufor, TEXT("%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, TEXT("STATIC"), TEXT("00:00:000"), WS_CHILD | WS_VISIBLE, 0, 0, 0, 0, hwnd, (HMENU)ID_VALUEFIELD1, hInstance, 0);
		if (ValueField == 0)
		{
			MessageBox(hwnd, TEXT("Problem z ValueField"), className, MB_OK);
			return 1;
		}

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

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

		BUTTON3 = CreateWindowEx(0, TEXT("BUTTON"), TEXT("Resetuj"), WS_CHILD | WS_VISIBLE, 0, 0, 0, 0, hwnd, (HMENU)ID_BUTTON3, hInstance, 0);
		if (!BUTTON2)
		{
			MessageBox(hwnd, TEXT("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, TEXT("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, TEXT("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;
}