package net.sourceforge.fenixedu.commons;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Properties;
import java.util.ResourceBundle;

import org.w3c.tidy.Tidy;

/**
 * @author mrsp and jdnf
 */
public class HtmlValidator {

    private Tidy tidy = null;
    private OutputStream outputStreamError = null;

    public HtmlValidator() {
	init();
    }

    private void init() {
	tidy = new Tidy();
	Properties properties = new Properties();
	ResourceBundle resourceBundle = ResourceBundle.getBundle("jtidy");

	convertPropertyResourceBundleToProperties(resourceBundle, properties);
	tidy.setConfigurationFromProps(properties);

	outputStreamError = new ByteArrayOutputStream();
	tidy.setErrout(new PrintWriter(outputStreamError, true));
    }

    private static void convertPropertyResourceBundleToProperties(ResourceBundle resourceBundle, Properties properties) {
	for (Enumeration enumeration = resourceBundle.getKeys(); enumeration.hasMoreElements();) {
	    String key = (String) enumeration.nextElement();
	    properties.setProperty(key, resourceBundle.getString(key));
	}
    }

    public String getErrors() {
	return this.outputStreamError.toString();
    }

    public String validateHTMLString(String htmlInput) {

	InputStream inputStreamData = new java.io.ByteArrayInputStream(htmlInput.getBytes());
	OutputStream outputStreamData = new ByteArrayOutputStream();
	reset(this.outputStreamError);

	tidy.parse(inputStreamData, outputStreamData);

	return outputStreamData.toString();
    }

    private void reset(OutputStream outputStream) {
	((ByteArrayOutputStream) outputStream).reset();
    }
}