using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Start of program");

        BTController btc = new BTController();

        btc.root = new Selector();

​

        Console.WriteLine("BTC.Tick() Return:"+ btc.Tick());

    }

}

​

//Brain--------------------------------------------------------------

public class BTController

{

    public bool hasTool = false;

    public Stack<Node> stack = new Stack<Node>();

    public Node root;

    public bool Tick()

    {

        if(root != null)

        {

            return root.Tick(this);

        }

        Console.WriteLine("No root is set!");

        return false;

    }

}

​

//BaseNode-------------------------------------------------------

public abstract class Node

{

    public abstract bool Tick(BTController controller); 

}

​

​

//Composite Node----------------------------------------------------------

public abstract class Composite : Node

{

    public Node[] children;

    public int childIndex = 0;

}

public class Selector : Composite

{

    public override bool Tick(BTController controller)

    {

        if(children[childIndex].Tick(controller))

        {

            return true;    

        }

        childIndex ++;

        return false;

    }

}

​

//Decorator Node---------------------------------------------------------

public abstract class Decorator : Node

{   

    public Node child;

}

​

public class Inverter : Decorator

{

    public override bool Tick(BTController controller)

    {

        if(child.Tick(controller))

        {

            return false;   

        }

        return true;

    }

}

​

//LEAF NODE--------------------------------------------------------------

public abstract class Leaf : Node

{

}

​

public abstract class Condition : Leaf

{   

    public override bool Tick(BTController controller)

    {

        return CheckCondition(controller);

    }

    public abstract bool CheckCondition(BTController controller);

}

public class ToolCheck : Condition

{

    public override bool CheckCondition(BTController controller)

    {

        return controller.hasTool;  

    }

}

​

public abstract class Action : Leaf

{

    public override bool Tick(BTController controller)

    {

        return DoAction(controller);

    }

    public abstract bool DoAction(BTController controller);

}

public class TakeTool : Action

{

    public override bool DoAction(BTController controller)

    {

        if(controller.hasTool)

        {

            return false;

        }

        controller.hasTool = true;

        return true;

    }

}

public class DropTool : Action

{

    public override bool DoAction(BTController controller)

    {

        if(controller.hasTool)

        {

            controller.hasTool = false;

            return true;

        }

        return false;

    }

}

​