// WinApiLAB2.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "WinApiLAB2.h"
#define w_width 400
#define w_height 600
#define MAX_LOADSTRING 100
const int ScreenX = (GetSystemMetrics(SM_CXSCREEN) - w_width) / 2; //defines positions such that window will be in the middle
const int ScreenY = (GetSystemMetrics(SM_CYSCREEN) - w_height) / 2;
// Global Variables:
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name
HWND hMainWnd;
HWND hBlockWnd;
void UpdateBlock();
struct Block {
	HWND BlockWnd;
	int size = 32;
	int x = 350;
	int y = 140;
};
Block block;
// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
ATOM				MyRegisterBlockClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK    WndProcBlock(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);


    // TODO: Place code here.

    // Initialize global strings
    LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadStringW(hInstance, IDC_WINAPILAB2, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);
	MyRegisterBlockClass(hInstance);
    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WINAPILAB2));

    MSG msg;

    // Main message loop:
    while (GetMessage(&msg, nullptr, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEXW 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_WINAPILAB2));
    wcex.hCursor        = LoadCursor(nullptr, IDC_ARROW);
	HBRUSH hb = CreateSolidBrush(RGB(0, 128, 255));
	wcex.hbrBackground = hb;
    wcex.lpszMenuName   = MAKEINTRESOURCEW(IDC_WINAPILAB2);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassExW(&wcex);
}
ATOM MyRegisterBlockClass(HINSTANCE hInstance)
{
	WNDCLASSEXW wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);

	wcex.style = CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc = WndProcBlock;
	wcex.cbClsExtra = 0;
	wcex.cbWndExtra = 0;
	wcex.hInstance = hInstance;
	wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINAPILAB2));
	wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
	HBRUSH hb = CreateSolidBrush(RGB(255, 0, 0));
	wcex.hbrBackground = hb;
	wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_WINAPILAB2);
	wcex.lpszClassName = L"BlockWnd";
	wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

	return RegisterClassExW(&wcex);
}
//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   hInst = hInstance; // Store instance handle in our global variable

   hMainWnd = CreateWindowW(szWindowClass, L"IcyTower", WS_OVERLAPPEDWINDOW ^ WS_THICKFRAME ^ WS_MAXIMIZEBOX | WS_CLIPCHILDREN, //WS_OVERLAPPED | WS_MINIMIZEBOX | WS_SYSMENU,
	   ScreenX, ScreenY, w_width, w_height, nullptr, nullptr, hInstance, nullptr);
   SetWindowPos(hMainWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
   if (!hMainWnd)
   {
	   return FALSE;
   }
   ShowWindow(hMainWnd, nCmdShow);
   UpdateWindow(hMainWnd);
   hBlockWnd = CreateWindow(L"BlockWnd", L"Block",
	   WS_CHILD,
	   180,510, 820, 40,
	   hMainWnd, NULL, hInstance, NULL);
   if (!hBlockWnd)
   {
	   return FALSE;
   }
   SetWindowRgn(hBlockWnd, CreateRectRgn(0, 0, block.size, block.size), true);

   ShowWindow(hBlockWnd, nCmdShow);
   UpdateWindow(hBlockWnd);
   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE: Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_COMMAND:
        {
            int wmId = LOWORD(wParam);
            // Parse the menu selections:
            switch (wmId)
            {
            case IDM_ABOUT:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
                break;
            case IDM_EXIT:
                DestroyWindow(hWnd);
                break;
            default:
                return DefWindowProc(hWnd, message, wParam, lParam);
            }
        }
        break;
	case WM_SETFOCUS: {SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) |
		WS_EX_LAYERED);
		// Make this window 50% alpha
		SetLayeredWindowAttributes(hWnd, 0, (500 * 50) / 100, LWA_ALPHA); }break;
	case WM_KILLFOCUS: { SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) |
		WS_EX_LAYERED);
		// Make this window 50% alpha
		SetLayeredWindowAttributes(hWnd, 0, (255* 50) / 100, LWA_ALPHA); }break;
    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);
            // TODO: Add any drawing code that uses hdc here...
            EndPaint(hWnd, &ps);
        }
        break;
	case WM_KEYDOWN: {
		if (wParam == 65) // A
		{
			block.x -= 20;
			UpdateBlock();
		}
		if (wParam == 83)
		{
			block.y += 20;
			UpdateBlock();
		}
		if (wParam == 68)
		{
			block.x += 20;
			UpdateBlock();
		}
		if (wParam == 68) // D
		{
			block.x += 20;
			UpdateBlock();
		}
	}break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}
LRESULT CALLBACK WndProcBlock(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	RECT rc;
	static int X, Y;
	switch (message)
	{

	case WM_PAINT:
	{
		PAINTSTRUCT ps;
		HDC hdc = BeginPaint(hWnd, &ps);


		EndPaint(hWnd, &ps);
	}
	break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
	return 0;
}

void UpdateBlock() {
	if (block.x < 0)
		block.x = 0;
	if (block.x > 800 - 16 - block.size)
		block.x = 800 - 16 - block.size;
	if (block.y < 0)
		block.y = 0;
	if (block.y > 600 - 77 - block.size)
		block.y = 600 - 77 - block.size;

	MoveWindow(hBlockWnd, block.x, block.y, block.size, block.size, true);
	UpdateWindow(hBlockWnd);
	SetLayeredWindowAttributes(hMainWnd, 0, (255 * 100) / 100, LWA_ALPHA);
}