#include <windows.h>
#include <stdio.h>

const char* NazwaKlasy = TEXT("Klasa Okienka");
MSG Komunikat;

HWND b, rb1, rb2, ef, sf, l, cb;

// OBSŁUGA ZDARZEŃ
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch (msg)
	{
	case WM_CREATE:
		b = CreateWindowEx(0, "BUTTON", "Button", WS_CHILD | WS_VISIBLE, 100, 100, 100, 30, hwnd, NULL, NULL, NULL);
		rb1 = CreateWindowEx(0, "BUTTON", "Radiobutton 1", WS_CHILD | BS_AUTORADIOBUTTON | WS_VISIBLE, 100, 140, 100, 30, hwnd, NULL, NULL, NULL);
		rb2 = CreateWindowEx(0, "BUTTON", "Radiobutton 2", WS_CHILD | BS_AUTORADIOBUTTON | WS_VISIBLE, 100, 180, 100, 30, hwnd, NULL, NULL, NULL);
		ef = CreateWindowEx(0, "EDIT", "FILL ME", WS_CHILD | WS_VISIBLE, 100, 220, 150, 30, hwnd, NULL, NULL, NULL);
		sf = CreateWindowEx(0, "STATIC", "STATIC", WS_CHILD | WS_VISIBLE, 100, 260, 150, 30, hwnd, NULL, NULL, NULL);
		l = CreateWindowEx(0, "LISTBOX", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | LBS_NOTIFY, 100, 300, 300, 50, hwnd, NULL, NULL, NULL);
		//                                                                          ^
		//                                                                          |
		//                                                         w chuj important bo inaczej nie wykryje LBN_SELCHANGE

		//SendMessage(l, LB_SETCURSEL, (WPARAM)1, (LPARAM)0);  <-- ustawia 1 element

		// Zamiast hwnd w 1 argumencie można GetDlgItem(hwnd okna, hmenu)
		SendMessage(l, LB_ADDSTRING, 0, (LPARAM)"List #1");
		SendMessage(l, LB_ADDSTRING, 0, (LPARAM)"List #2");
		SendMessage(l, LB_ADDSTRING, 0, (LPARAM)"List #3");

		//                                                                                                                      jak za mało to nigdy elementów nie zobaczysz
		//                                                                                                                      lepiej dac liczbę z kosmosu niz za mala
		//                                                                                                                             |
		//                                                                                                                             v
		cb = CreateWindowEx(0, "COMBOBOX", NULL, CBS_DROPDOWN | CBS_HASSTRINGS | WS_CHILD | WS_OVERLAPPED | WS_VISIBLE, 100, 390, 120, 100, hwnd, NULL, NULL, NULL);

		//         inaczej niż w liście      można albo nawiasik albo TEXT()
		//              |                          |
		//              v                          v
		SendMessage(cb, CB_ADDSTRING, 0, (LPARAM)TEXT("Combobox #1"));
		SendMessage(cb, CB_ADDSTRING, 0, (LPARAM)TEXT("Combobox #2"));
		SendMessage(cb, CB_ADDSTRING, 0, (LPARAM)TEXT("Combobox #3"));

		//SendMessage(cb, CB_SETCURSEL, (WPARAM)1, (LPARAM)0);   <-- ustawia 1 element
		break;
	case WM_COMMAND:
		if ((HWND)lParam == b)
		{
			SetWindowText(sf, TEXT("Button"));
		}
		else if ((HWND)lParam == rb1)
		{
			SetWindowText(sf, TEXT("Radiobutton #1"));
		}
		else if ((HWND)lParam == rb2)
		{
			SetWindowText(sf, TEXT("Radiobutton #2"));
		}
		else if ((HWND)lParam == ef)
		{
			// GetWindowTextLength i GlobalAlloc są dla leszczy
			char s[50];
			GetWindowText(ef, s, 50);
			SetWindowText(sf, s);
		}
		else if ((HWND)lParam == l)
		{
			if (HIWORD(wParam) == LBN_SELCHANGE)
			{
				int index = (int)SendMessage(l, LB_GETCURSEL, (WPARAM)0, (LPARAM)0);
				if (index == LB_ERR)
				{
					MessageBox(hwnd, TEXT("Kliknij co"), TEXT(":C"), NULL);
					return 0;
				}
				TCHAR buf[50] = { 0 };
				SendMessage(l, LB_GETTEXT, index, (LPARAM)buf);
				SetWindowText(sf, buf);
			}
		}
		else if ((HWND)lParam == cb)
		{
			if (HIWORD(wParam) == CBN_SELCHANGE)
			{
				int index = (int)SendMessage(cb, CB_GETCURSEL, (WPARAM)0, (LPARAM)0);
				if (index == CB_ERR)
				{
					MessageBox(hwnd, TEXT("Kliknij co"), TEXT(":C"), NULL);
					return 0;
				}
				TCHAR buf[50] = { 0 };
				SendMessage(cb, CB_GETLBTEXT, index, (LPARAM)buf);
				SetWindowText(sf, buf);
			}
			else
			{
				char s[50];
				GetWindowText(cb, s, 50);
				SetWindowText(sf, s);
			}
		}
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hwnd, msg, wParam, lParam);
	}

	return 0;
}

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


	// WYPEŁNIANIE STRUKTURY
	WNDCLASSEX wc;

	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = CS_VREDRAW | CS_HREDRAW;  // Dzięki temu rysuje się jeszcze raz
	wc.lpfnWndProc = WndProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = NazwaKlasy;
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);


	// REJESTROWANIE KLASY OKNA
	if (!RegisterClassEx(&wc))
	{
		MessageBox(NULL, TEXT("Nie przeszło rejestracji"), TEXT("..."),
			MB_ICONEXCLAMATION | MB_OK);
		return 1;
	}


	// TWORZENIE OKNA
	HWND hwnd;

	hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, NazwaKlasy, TEXT("Oto okienko"), WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, 450, 600, NULL, NULL, hInstance, NULL);

	if (hwnd == NULL)
	{
		MessageBox(NULL, TEXT("Ni ma okna"), TEXT("..."), MB_ICONEXCLAMATION);
		return 1;
	}

	ShowWindow(hwnd, nCmdShow); // Pokaż okienko...
	UpdateWindow(hwnd);

	// Pętla komunikatów
	while (GetMessage(&Komunikat, NULL, 0, 0))
	{
		TranslateMessage(&Komunikat);
		DispatchMessage(&Komunikat);
	}

	return Komunikat.wParam;
}