#include <windows.h>
#include "spot.h"
#include "objSpot.h"

spot blob;
PAINTSTRUCT ps;

const char className[] = "Spot";
const char APP_TITLE[] = "Moving spot demo";

const unsigned short int APP_WIDTH = 800;
const unsigned short int APP_HEIGHT = 600;

LRESULT CALLBACK mainEventListener (HWND hwnd, UINT event, WPARAM object, LPARAM lParam);

LRESULT CALLBACK mainEventListener (HWND hwnd, UINT event, WPARAM object, LPARAM lParam)
{
	
	if (event == WM_CHAR)
	{
		
		HDC hdc = GetDC(hwnd);
		unsigned short int buffer;
		
		if (object == 54) //right
		{
			
			buffer = blob.getX();
			
			if ((buffer + 20) < APP_WIDTH)
			{
				blob.move(hdc, (buffer + 20), blob.getY());
			}
			
		}
		else if (object == 52) //left
		{
			
			buffer = blob.getX();
			
			if ((buffer - 20) > 0)
			{
				blob.move(hdc, (buffer - 20), blob.getY());
			}
			
		}
		else if (object == 50) //Down
		{
			
			buffer = blob.getY();
			
			if ((buffer + 20) < APP_HEIGHT)
			{
				blob.move(hdc, blob.getX(), (buffer + 20));
			}
			
		}
		else if (object == 56) //Up
		{
			
			buffer = blob.getY();
			
			if ((buffer - 20) > 0)
			{
				blob.move(hdc, blob.getX(), (buffer - 20));
			}
			
		}
		
		ReleaseDC(hwnd, hdc);
		
	}
	else if (event == WM_PAINT)
	{
		
		HDC hdc = BeginPaint(hwnd, &ps);
		blob.plot(hdc);
		EndPaint(hwnd, &ps);
		
	}	
	else if (event == WM_CLOSE)
	{
		DestroyWindow(hwnd);
	}
	else if (event == WM_DESTROY)
	{
		PostQuitMessage(0);
	}
	else
	{
		return DefWindowProc(hwnd, event, object, lParam);
	}
	
	return 0;
	
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR args, int nCmdShow)
{
	
    WNDCLASSEX wc; //The class settings
    HWND hwnd; //Main window handler
    MSG Msg; //Here messages to the application are saved

    //Step 1: Registering the Window Class
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.lpfnWndProc = mainEventListener;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE(imgMainIcon));
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(GetStockObject(WHITE_BRUSH));
    wc.lpszMenuName = NULL;
    wc.lpszClassName = className;
    wc.hIconSm = (HICON)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(imgMainIcon), IMAGE_ICON, 16, 16, 0);

    if(!RegisterClassEx(&wc)) //If the class was not registered successfully
    {

        MessageBox(NULL, "Window Registration Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        return 0;
        
    }

    spot blob();
    //Create the window
    hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, className, APP_TITLE, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, APP_WIDTH, APP_HEIGHT, NULL, NULL, hInstance, NULL);

    if(hwnd == NULL) //If a problem occured with creating the window
    {
	    
        MessageBox(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);        
        return 0;
        
    }

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    //This keeps looping and processing messages when they become available
    //The while loop ends when a destroy message is sent
    while(GetMessage(&Msg, NULL, 0, 0) > 0)
    {
	    
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
        
    }
    
    return Msg.wParam;
    
}