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package com.arch.util;

import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public final class XmlUtils {

    public static final int LINE_WIDTH = 65;
    public static final int INDENT = 2;

    private XmlUtils() {

    }

    public static String getValue(String xml, String atributo) {
        if (xml == null) {
            return "";
        }

        Pattern regexValue = Pattern.compile("<" + atributo + ">([^<]+)");
        Matcher match = regexValue.matcher(xml);

        if (match.find()) {
            return match.group(1);
        } else {
            return "";
        }
    }

    public static String format(String unformattedXml) throws IOException, ParserConfigurationException, SAXException {
        final Document document = parseXmlFile(unformattedXml);

        OutputFormat format = new OutputFormat(document);
        format.setLineWidth(LINE_WIDTH);
        format.setIndenting(true);
        format.setIndent(INDENT);
        Writer out = new StringWriter();
        XMLSerializer serializer = new XMLSerializer(out, format);
        serializer.serialize(document);

        return out.toString();
    }

    private static Document parseXmlFile(String in) throws ParserConfigurationException, IOException, SAXException {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        InputSource is = new InputSource(new StringReader(in));
        return db.parse(is);
    }

}