#include <Windows.h> // Podstawa do WinAPI
#include <string>
using namespace std;
HWND hwnd, Res ,Pos;
WNDCLASSEX window; // Zmienna klasy
MSG msg; // Zmienna wydarzenia
TCHAR Class_Name[] = TEXT("OKNO_TEST"), Title[] = TEXT("Tytul"); // Tytuly TCHAR
int NumberOfWindows = 0;
int PositionX = 0, PositionY = 0;
int Width = 0, Height = 0;
RECT rect;

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {//Funkcja eventów
    switch (msg) {
    case WM_CREATE:
        NumberOfWindows++;
        UpdateWindow(hwnd);
        break;
    case WM_COMMAND:    break;// Eventy uzytkownika
    case WM_CLOSE:// Event zamkniecia
        if (MessageBox(0, TEXT("Zamknac to okno?"), TEXT("?"), MB_YESNO | MB_ICONQUESTION) == IDYES) {
            NumberOfWindows--;
            DestroyWindow(hwnd);
        }
        break;
    case WM_DESTROY:// Event zamkniecia
        if (NumberOfWindows == 0) {
            MessageBox(0, TEXT("KONIEC!"), TEXT("KONIEC!"), MB_OK);
            PostQuitMessage(0);
        }
        break;
    case WM_LBUTTONDOWN:
        hwnd = CreateWindowEx(0, Class_Name, TEXT("Nowe Okno"), WS_OVERLAPPEDWINDOW, (100+(NumberOfWindows*10)), (100 + (NumberOfWindows * 10)), 500, 300, 0, 0, GetModuleHandle(0), 0);
        ShowWindow(hwnd, SW_SHOW);
        UpdateWindow(hwnd);
        break;
    case WM_SIZE:
        if (GetWindowRect(hwnd, &rect)) {
            Width = rect.right - rect.left;
            Height = rect.bottom - rect.top;
            SetWindowText(Res, TEXT(("Rozdzielczość: " + to_string(Width) + "x" + to_string(Height)).c_str()));
        }
        break;
    case WM_MOVE:
        InvalidateRect(hwnd, &rect, 1);
        PositionX = LOWORD(lParam);
        PositionY = HIWORD(lParam);
        SetWindowText(Pos, TEXT(("Pozycja: " + to_string(PositionY) + "x" + to_string(PositionX)).c_str()));
        break;
    default:// Nieznany event
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

bool Register_Class(HINSTANCE &hInstance) {
    window.cbClsExtra = NULL;// Wypelnianie klasy okna //
    window.cbSize = sizeof(WNDCLASSEX);
    window.cbWndExtra = NULL;
    window.hbrBackground = (HBRUSH)(COLOR_WINDOW);
    window.hCursor = LoadCursor(NULL, IDC_ARROW);
    window.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    window.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    window.hInstance = hInstance;
    window.lpfnWndProc = WndProc;
    window.lpszClassName = Class_Name;
    window.lpszMenuName = 0;
    window.style = CS_VREDRAW | CS_HREDRAW;
    return RegisterClassEx(&window);
}

void Unregister_Window(HINSTANCE &hInstance) {
    if (!UnregisterClass(Class_Name, hInstance)) { // Niszczenie okna ....
        MessageBox(NULL, TEXT("Błąd niszczenia okna"), TEXT("Błąd"), MB_ICONEXCLAMATION);
    }
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR ilCmdLine, int nCmdShow) { // main
    Register_Class(hInstance);

    if (!Register_Class) { // Rejestracja klasy okna .... jesli blad STOP
        MessageBox(NULL, TEXT("Błąd rejestracji okna"), TEXT("Błąd"), MB_ICONEXCLAMATION);
        return 0;
    }

    hwnd = CreateWindowEx(WS_EX_WINDOWEDGE, Class_Name, Title, WS_OVERLAPPEDWINDOW | WS_VISIBLE, 200-8, 200-31, 800, 600, NULL, NULL, hInstance, NULL); //Tworzenie okna

    if (hwnd == NULL) {//Sprawdzanie czy okno zostalo stworzeona
        MessageBox(NULL, TEXT("Błąd tworzenia okna"), TEXT("Błąd"), MB_ICONEXCLAMATION);
        return 0;
    }
    string s = to_string(Width) + to_string(Height);
    Res = CreateWindowEx(NULL, "STATIC", TEXT(("Rozdzielczość: " + to_string(Width) + "x" + to_string(Height)).c_str()), WS_VISIBLE | WS_CHILD | SS_LEFT, 10, 10, 200, 50, hwnd, NULL, hInstance, NULL);
    Pos = CreateWindowEx(NULL, "STATIC", TEXT(("Pozycja: " + to_string(PositionY) + "x" + to_string(PositionX)).c_str()), WS_VISIBLE | WS_CHILD | SS_LEFT, 10, 60, 200, 50, hwnd, NULL, hInstance, NULL);

    ShowWindow(hwnd, nCmdShow); // Wyswietlenie okna
    UpdateWindow(hwnd); // Aktualizacja okna

    while (GetMessage(&msg, NULL, 0, 0)) { // Petla eventow
        TranslateMessage(&msg); // tlumacznie eventu
        DispatchMessage(&msg); // Wykonywanie eventu
    }


    Unregister_Window(hInstance);

    return msg.wParam;
}