#include <tchar.h>
#include <Windows.h>

#pragma comment(linker, "\"/manifestdependency:type='win32' \
name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' \
publicKeyToken='6595b64144ccf1df' language='*'\"")


LRESULT CALLBACK WindowProcedure(HWND, UINT, WPARAM, LPARAM);
void CALLBACK Move(HWND hWnd, int dx, int dy, bool center = false);
INT WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR szCmdLine, INT nCmdShow)
{
	TCHAR szClassWindow[] = TEXT("Win32Application");

	WNDCLASSEX wc = {};
	wc.cbClsExtra = 0;
	wc.cbSize = sizeof(wc);
	wc.cbWndExtra = 0;
	wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
	wc.hInstance = hInstance;
	wc.lpfnWndProc = WindowProcedure;
	wc.lpszClassName = szClassWindow;
	wc.lpszMenuName = NULL;
	wc.style = CS_HREDRAW | CS_VREDRAW;

	INT nExitCode = 0;

	if (RegisterClassEx(&wc))
	{
		HWND hWindow = CreateWindowEx(0, szClassWindow, TEXT("Поиграй со мной"),
			WS_OVERLAPPEDWINDOW, 250, 250, 200, 200, NULL,
			NULL, hInstance, NULL);

		ShowWindow(hWindow, nCmdShow);
		UpdateWindow(hWindow);


		MSG message = {};

		while (GetMessage(&message, NULL, 0, 0))
		{
			TranslateMessage(&message);
			DispatchMessage(&message);
		}

		nExitCode = message.wParam;
	}

	return nExitCode;
}


LRESULT CALLBACK WindowProcedure(HWND hWindow, UINT nMessage, WPARAM wParam, LPARAM lParam)
{
	LRESULT result = 0;

	switch (nMessage)
	{
	case WM_CHAR:

		break;
	case WM_KEYDOWN:
		if (wParam == VK_ESCAPE)
		{
			ShowWindow(hWindow, SW_NORMAL);
			SetWindowPos(hWindow, NULL, 0, 0, CW_USEDEFAULT, CW_USEDEFAULT, 1);
		}
		else if (wParam == VK_LEFT)
			Move(hWindow, -50, 0);
		else if (wParam==VK_RIGHT)
			Move(hWindow, 50, 0);
		else if (wParam == VK_UP)
			Move(hWindow, 0, -50);
		else if (wParam == VK_DOWN)
			Move(hWindow, 0, 50);
		else if (wParam == VK_RETURN)
			ShowWindow(hWindow, SW_SHOWMAXIMIZED);
		else if (wParam == VK_SPACE)
		{
			Move(hWindow, 0, 0, true);
		}

		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default:
		result = DefWindowProc(hWindow, nMessage, wParam, lParam);
		break;
	}

	return result;
}
void CALLBACK Move(HWND hWnd, int dx, int dy, bool center)
{
	int width = GetSystemMetrics(SM_CXSCREEN); // граница ширины экрана
	int height = GetSystemMetrics(SM_CYSCREEN); // граница высоты экрана
	RECT rect;
	GetWindowRect(hWnd, &rect);
	if (center == false)
	{
		if (rect.top <= 0 && dy < 0) dy = 0;
		else if (rect.bottom >= height&&dy>0)dy = 0;
		if (rect.left <= 0 && dx < 0) dx = 0;
		else if (rect.right >= width&&dx>0)dx = 0;
		dx += rect.left;
		dy += rect.top;
		SetWindowPos(hWnd, NULL, dx, dy, CW_USEDEFAULT, CW_USEDEFAULT, 1);
	}
	else
		SetWindowPos(hWnd, NULL, ((width/2)-((rect.right-rect.left))/2), ((height/2)-((rect.bottom-rect.top))/2), CW_USEDEFAULT, CW_USEDEFAULT, 1);
}