#include <iostream>
#include "IrrLib.h"
#include <irrlicht.h>

using namespace std;

using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;

int main(){
	IrrLib Irrlicht(5, 640, 480, 16, false, true, false);

	//Create a variable to determine if we should draw under the mouse or not
    bool draw = false;

    //Screen caption
    std::string cap;

    //Future use of screen resolution
    dimension2d<s32> res;

    //Declare 2 mouse containters so we can find out if the user has moved the mouse
    position2d<s32> mxy;
    position2d<s32> lastmxy;

    //This function returns the size of the window Irrlicht is currently using
    res = Irrlicht.GetScreenSize();

    //Set the caption
    cap = "Height in pixels: " + Irrlicht.int_to_string(res.Height) + " Width in pixels: " + Irrlicht.int_to_string(res.Width);
    Irrlicht.SetWindowCaption(Irrlicht.stdstring_to_stringw(cap));
	while (Irrlicht.DeviceIsRunning())
	if (Irrlicht.IsActiveWindow())
	{
            //I was in a Red color mood when I made this, you can chose from a varity of colors.
            Irrlicht.BeginScene(Irrlicht.Color.RED);

            //If the user hits the left mouse button
            if (Irrlicht.IrrEvent.mouseStates[0])
            {
                //we need to set it to false so we don't detect it again
                Irrlicht.IrrEvent.mouseStates[0] = false;
                //The user clicked the mouse so we need to turn drawing on and record the mouse
                //pos so we can find out later if they move the mouse
                if (draw == false){
                    lastmxy.Y = Irrlicht.IrrEvent.getMouseY();
                    lastmxy.X = Irrlicht.IrrEvent.getMouseX();
                    draw = true;
                }
                else
                    //turn it off
                    draw = false;
            }
            //if drawing is on
            if (draw)
            {
                //Get current mouse pos
                mxy.Y = Irrlicht.IrrEvent.getMouseY();
                mxy.X = Irrlicht.IrrEvent.getMouseX();

                //If current mouse pos != last mouse pos then add the line to Irr2D's vector of lines
                //So Irr2D will know how many lines to draw and where to draw them
                //Also record this pos so we can compare it later
                if (mxy != lastmxy){
                    Irrlicht.Irr2DLib.AddLines(lastmxy, mxy, Irrlicht.Color.GREEN);
                    lastmxy = mxy;
                }
            }

            //This is new, this tells Irr2D to draw all lines that it has collected so far
            Irrlicht.Irr2DLib.DrawLines();

            //The usual stuff
			Irrlicht.DrawAll();
			Irrlicht.EndScene();
	}
	Irrlicht.EndIrrlicht();
	return 0;
}