#include <windows.h>
#include <string.h>

const char windowClass[] = "win32app";
const char windowTitle[] = "Заголовок окна";
const char stringToDraw[] = "ПКИМС правит миром!";

bool move_up = false;
int X_WINDOW = 700, Y_WINDOW = 300;
int BANG_TIMER = 250, WALL_TIMER = 50;
int BANG_TIMER_ID = 38, WALL_TIMER_ID = 39;
int r1x1 = NULL, r1y1 = NULL, r1x2 = NULL, r1y2 = NULL;
int r2x1 = X_WINDOW - 10, r2y1 = 30, r2x2 = X_WINDOW, r2y2 = 70;

long __stdcall WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
    PAINTSTRUCT ps;
    int x_click, y_click;
    HDC hdc;
    HPEN pen, old_pen;

    RECT rect;
    GetClientRect(hWnd, &rect);

    switch (message) {

    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        pen = CreatePen(PS_DASH, 1, RGB(0, 0, 0));
        old_pen = (HPEN)SelectObject(hdc, pen);
        MoveToEx(hdc, X_WINDOW / 2, 0, NULL);
        LineTo(hdc, X_WINDOW / 2, Y_WINDOW);
        SelectObject(hdc, old_pen);
        DeleteObject(pen);

        Rectangle(hdc, r2x1, r2y1, r2x2, r2y2);
        Rectangle(hdc, r1x1, r1y1, r1x2, r1y2);

        EndPaint(hWnd, &ps);
        break;
    case WM_LBUTTONDOWN:
        x_click = LOWORD(lParam);
        y_click = HIWORD(lParam);
        if (x_click < X_WINDOW / 2) {
            r1x1 = x_click;
            r1y1 = y_click;
            r1x2 = x_click + 10;
            r1y2 = y_click + 10;
            InvalidateRect(hWnd, NULL, true);
        }
        break;
    case WM_SIZE:
        X_WINDOW = rect.right;
        Y_WINDOW = rect.bottom;
        r2x1 = X_WINDOW - 10;
        r2x2 = X_WINDOW;

        if (r1y1 >= Y_WINDOW && r1y1 != NULL) {
            r1x1 = NULL;
            r1y1 = NULL;
            r1x2 = NULL;
            r1y2 = NULL;
            MessageBox(hWnd, "Ooops! We lost the shot!", "Oooops!", NULL);
        }
        InvalidateRect(hWnd, NULL, true);
        break;

    case WM_TIMER:
        if (wParam == 38) {
            if (r1x1 != NULL) {
                r1x1 = r1x1 + 10;
                r1x2 = r1x2 + 10;
                InvalidateRect(hWnd, NULL, true);
            }
        }
        if (wParam == 39) {
            if (move_up) {
                r2y1 = r2y1 - 10;
                r2y2 = r2y2 - 10;
            }
            else {
                r2y1 = r2y1 + 10;
                r2y2 = r2y2 + 10;
            }

            if (r2y2 >= Y_WINDOW) {
                move_up = true;
            }
            if (r2y1 <= 0) {
                move_up = false;
            }
            InvalidateRect(hWnd, NULL, true);
        }

        if (((r1x2 >= r2x1) && (r1x1 <= r2x2)) && ((r1y2 >= r2y1) && (r1y1 <= r2y2))) {
            r1x1 = NULL;
            r1y1 = NULL;
            r1x2 = NULL;
            r1y2 = NULL;
            MessageBox(hWnd, "Bang", "Bang", NULL);
        }

        if (r1x1 >= X_WINDOW) {
            r1x1 = NULL;
            r1y1 = NULL;
            r1x2 = NULL;
            r1y2 = NULL;
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }

    return 0;
}


int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = windowClass;
    wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

    if (!RegisterClassEx(&wcex)) {
        MessageBox(NULL, "Can’t register window class!", "Win32 API Test", NULL);
        return 1;
    }

    HWND hWnd = CreateWindow(windowClass, windowTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, X_WINDOW, Y_WINDOW, NULL, NULL, hInstance, NULL);

    if (!hWnd) {
        MessageBox(NULL, "Can’t create window!", "Win32 API Test", NULL);
        return 1;
    }

    ShowWindow(hWnd, nCmdShow);

    SetTimer(hWnd, BANG_TIMER_ID, BANG_TIMER, NULL);
    SetTimer(hWnd, WALL_TIMER_ID, WALL_TIMER, NULL);

    UpdateWindow(hWnd);
    MSG msg;

    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    KillTimer(hWnd, BANG_TIMER_ID);
    KillTimer(hWnd, WALL_TIMER_ID);
    return msg.wParam;
}