#format java
/** 
 * MementoPattern example
 * Dice game
 */

import java.util.Vector;
import java.util.Iterator;
import java.util.Random;

class Memento {
    int money;
    Vector fruits;
    public int getMoney() {
        return money;
    }
    Memento(int money) {
        this.money = money;
        this.fruits = new Vector();
    }
    void addFruit(String fruit) {
        fruits.add(fruit);
    }
}

class Gamer {
    private int money;
    private Vector fruits = new Vector();
    private Random random = new Random();
    private static String[] fruitsname = {
        "apple","grape","banana","orange"
    };
    public Gamer(int money) {
        this.money = money;
    }
    public int getMoney() {
        return money;
    }
    public void bet() {
        int dice = random.nextInt(6) + 1;
        if(dice == 1) {
            money += 100;
            System.out.println("increase 100 money");
        } else if(dice == 2) {
            money /= 2;
            System.out.println("decrease half money");
        } else if(dice == 6) {
            String f = getFruit();
            System.out.println("take fruit "+f);
            fruits.add(f);
        } else {
            System.out.println("Nothing happen");
        }
    }
    public Memento createMemento() {
        Memento m = new Memento(money);
        Iterator it = fruits.iterator();
        while(it.hasNext()) {
            String f = (String)it.next();
            if(f.startsWith("delicious")) {
                m.addFruit(f);
            }
        }
        return m;
    }
    public void restoreMemento(Memento memento) {
        this.money = memento.money;
        this.fruits = memento.fruits;
    }
    public String toString() {
        return "[money = "+money+", fruits = "+fruits+"]";
    }
    private String getFruit() {
        String prefix = "";
        if(random.nextBoolean()) {
            prefix = "delicious ";
        }
        return prefix + fruitsname[random.nextInt(fruitsname.length)];
    }
}

public class MementoDiceGame {
    public static void main(String[] args) {
        Gamer gamer = new Gamer(100);
        Memento memento = gamer.createMemento();
        for(int i=0; i < 100; i++) {
            System.out.println("==== "+i);
            System.out.println("present state: "+gamer);
            gamer.bet();
            System.out.println("money become "+gamer.getMoney());

            if(gamer.getMoney() > memento.getMoney()) {
                System.out.println("    memorize state due to increase");
                memento = gamer.createMemento();
            } else if(gamer.getMoney() < memento.getMoney()/2) {
                System.out.println("    restore due to decrease");
                gamer.restoreMemento(memento);
            }
            try {
                Thread.sleep(1000);
            } catch(InterruptedException e) {
            }
            System.out.println("");
        }
    }
}