package com.iluwatar.command;

import java.util.Deque;

import java.util.LinkedList;

/**

*

* Wizard is the invoker of the commands

*

*/

public class Wizard {

private Deque<Command> undoStack = new LinkedList<>();

private Deque<Command> redoStack = new LinkedList<>();

public Wizard() {

}

public void castSpell(Command command, Target target) {

System.out.println(this + " casts " + command + " at " + target);

command.execute(target);

undoStack.offerLast(command);

}

public void undoLastSpell() {

if (!undoStack.isEmpty()) {

Command previousSpell = undoStack.pollLast();

redoStack.offerLast(previousSpell);

System.out.println(this + " undoes " + previousSpell);

previousSpell.undo();

}

}

public void redoLastSpell() {

if (!redoStack.isEmpty()) {

Command previousSpell = redoStack.pollLast();

undoStack.offerLast(previousSpell);

System.out.println(this + " redoes " + previousSpell);

previousSpell.redo();

}

}

@Override

public String toString() {

return "Wizard";

}

}