class Node
{
    constructor()
    {
        this.children = [];
        this.value = 0;
    }
    
    getChildren()
    {
        return this.children;
    }
}

function Mind() 
{
	
	this.newRun = function()                  
	{
	    this.dir = ACTION_UP;
	    this.pposx = -1;
	    this.pposy = -1;
	    this.bposx = -1;
	    this.bposy = -1;
	};

    this.is_blocked = function(xp, yp, xb, yb)
    {
        if (this.pposx != xp)
            return false;
        if (this.pposy != yp)
            return false;
        if (this.bposx != xb)
            return false;
        if (this.bposy != yb)
            return false;
        if (this.dir == ACTION_LEFT)
            this.dir = ACTION_RIGHT;
        else if (this.dir == ACTION_RIGHT)
            this.dir = ACTION_LEFT;
        else if (this.dir == ACTION_UP)
            this.dir = ACTION_DOWN;
        else if (this.dir == ACTION_DOWN)
            this.dir = ACTION_UP;
        //this.printDir(this.dir);
        return true;
    };

    this.evaluate = function(xp, yp, xb, yb)
    {
        distance = 21;
        move_lateral = true;
        distance = (Math.abs(xp - xb) < distance && Math.abs(xp - xb) > 0 ? Math.abs(xp - xb) : distance);
        if (Math.abs(yp - yb) < distance && Math.abs(yp - yb) > 0)
            {
                distance = Math.abs(yp - yb);
                move_lateral = false;
            }
        if (this.is_blocked(xp, yp, xb, yb) === true)
            return this.dir;
        if (distance <= 6)
        {
            if (move_lateral)
            {
                if (xp > xb)
                    this.dir = ACTION_RIGHT;
                else
                    this.dir = ACTION_LEFT;
            }
            else
            {
                if (yp > yb)
                    this.dir = ACTION_UP;
                else
                    this.dir = ACTION_DOWN;
            }
            //this.printDir(this.dir);
            this.copyPositions([xp, yp, xb, yb]);
            return this.dir;
        }
        return 4;
    };
    
    this.printDir = function(dir)
    {
        if (dir == ACTION_LEFT)
            console.log("ACTION_LEFT")
        else if (dir == ACTION_RIGHT)
            console.log("ACTION_RIGHT")
        else if (dir == ACTION_UP)
            console.log("ACTION_UP")
        else if (dir == ACTION_DOWN)
            console.log("ACTION_DOWN")
        else
            console.log("DO NOTHING")
    }
    
    this.copyPositions = function (state)
    {
	   this.pposx = state[0];
	   this.pposy = state[1];
	   this.bposx = state[2];
	   this.bposy = state[3];
    };
    
	this.getAction = function ( state )
	{
	    if (this.pposx == -1)
	        this.copyPositions(state);
	    
	   return this.evaluate(state[0], state[1], state[2], state[3]);
	};

		 
	this.endRun = function()                 
	{
	};

}