/* Solution to Chapter 21, Exercise 1 in Teach Yourself Java in 21 Days (Eighth
   Edition) by Rogers Cadenhead. */
package com.java21days.banko;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.swing.JOptionPane;
import nu.xom.Builder;
import nu.xom.Document;
import nu.xom.Element;
import nu.xom.Elements;
import nu.xom.ParsingException;
import nu.xom.Serializer;
import nu.xom.Text;

public class ScoreKeeper {
    private static final String FILENAME = "banko-scores.xml";
    
    public ScoreKeeper() { }
    
    public static void update(int newScore) {    	
        try {
            Builder bob = new Builder();
            File xmlFile = new File(FILENAME);
            Document doc = bob.build(xmlFile);
            Element root = doc.getRootElement();
            Elements players = root.getChildElements("Player");
            for (int i = 0; i < players.size(); i++) {
                Element player = players.get(i);
                Element name = player.getFirstChildElement("Name");
                Element score = player.getFirstChildElement("Score");
                int oldScore = Integer.parseInt(getValue(score));
                if (newScore > oldScore) {
                    String newName = JOptionPane.showInputDialog(null,
                        "New high score! Enter your name:");
                    if (name.getChildCount() > 0) {
                        name.getChild(0).detach();
                    }
                    name.appendChild(newName);
                    score.getChild(0).detach();
                    score.appendChild("" + newScore);
                    FileOutputStream f = new FileOutputStream(FILENAME);
                    Serializer output = new Serializer(f, "ISO-8859-1");
                    output.setIndent(2);
                    output.write(doc);
                    return;
                }
                
            }
        } catch (ParsingException | IOException exc) {
            System.out.println("Error: " + exc.getMessage());
        }
    }
    
    private static String getValue(Element element) {
    	if (element != null) {
            Text elementText = (Text) element.getChild(0);
            return elementText.getValue();
    	}
        return "";
    }
    
    public static void main(String[] arguments) {
        ScoreKeeper.update(15);
    }
}