package org.apidesign.demo.anagramwithspringandlookup.simplescrambler;

import java.util.Random;

import org.apidesign.demo.anagramwithspringandlookup.Scrambler;

import org.openide.util.lookup.ServiceProvider;

// BEGIN: anagramdemo.springlookup.scrambler

@ServiceProvider(service=Scrambler.class)

public class SimpleScrambler implements Scrambler {

    private static final Random random = new Random();

    public String scramble(String word) {

// FINISH: anagramdemo.springlookup.scrambler

        for (;;) {

            int index1 = random.nextInt(word.length());

            int index2 = random.nextInt(word.length());

            if (index1 == index2) {

                continue;

            }

            char char1 = word.charAt(index1);

            char char2 = word.charAt(index2);

            StringBuilder sb = new StringBuilder(word);

            sb.setCharAt(index1, char2);

            sb.setCharAt(index2, char1);

            return sb.toString();

        }

    }

}