/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache POI" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache POI", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.io.InputStream;
import java.io.FileInputStream;
import java.io.BufferedInputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.Writer;
import java.io.PrintWriter;
import java.io.FileWriter;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

import java.util.ArrayList;

import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.tidy.Tidy;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.taskdefs.Property;

/**
 * Task to ask property values to the user. Uses current value as default.
 *
 * @author <a href="mailto:barozzi@nicolaken.com">Nicola Ken Barozzi</a>
 * @created 14 January 2002
 */

public class JTidyTask
    extends org.apache.tools.ant.Task
{
    private String src;
    private String dest;
    private String log;
    private Tidy   tidy;
    private String warn    = "false";
    private String summary = "false";
    PrintWriter    pw;

    /**
     * Constructor.
     */

    public JTidyTask()
    {
        super();
    }

    /**
     * Initializes the task.
     */

    public void init()
    {
        super.init();

        // Setup an instance of Tidy.
        tidy = new Tidy();
        tidy.setXmlOut(true);
        tidy.setXHTML(true);
        tidy.setDropFontTags(true);
        tidy.setLiteralAttribs(true);
        tidy.setMakeClean(true);
        tidy.setShowWarnings(Boolean.getBoolean(warn));
        tidy.setQuiet(!Boolean.getBoolean(summary));
    }

    /**
     * Run the task.
     * @exception org.apache.tools.ant.BuildException The exception raised during task execution.
     */

    public void execute()
        throws org.apache.tools.ant.BuildException
    {
        try
        {
            PrintWriter pw = new PrintWriter(new FileWriter(log));

            tidy.setErrout(pw);

            // Extract the document using JTidy and stream it.
            BufferedInputStream  in     =
                new BufferedInputStream(new FileInputStream(src));

            // FileOutputStream out = new FileOutputStream(dest);
            PrintWriter          out    =
                new PrintWriter(new FileWriter(dest));

            // using null as output to get dom so to remove duplicate attributes
            org.w3c.dom.Document domDoc = tidy.parseDOM(in, null);

            domDoc.normalize();
            stripDuplicateAttributes(domDoc, null);
            org.apache.xml.serialize.OutputFormat format =
                new org.apache.xml.serialize.OutputFormat();

            format.setIndenting(true);
            format.setEncoding("ISO-8859-1");
            format.setPreserveSpace(true);
            format.setLineSeparator("\n");
            org.apache.xml.serialize.XMLSerializer serializer =
                new org.apache.xml.serialize.XMLSerializer(out, format);

            serializer.serialize(domDoc);
            out.flush();
            out.close();
            in.close();
            pw.flush();
            pw.close();
        }
        catch (IOException ioe)
        {
            throw new BuildException(ioe);
        }
    }

    public void setSrc(String src)
    {
        this.src = src;
    }

    public void setDest(String dest)
    {
        this.dest = dest;
    }

    public void setLog(String log)
    {
        this.log = log;
    }

    public void setWarn(String warn)
    {
        this.warn = warn;
    }

    public void setSummary(String summary)
    {
        this.summary = summary;
    }

    // using parent because jtidy dom is bugged, cannot get parent or delete child
    public static void stripDuplicateAttributes(Node node, Node parent)
    {

        // The output depends on the type of the node
        switch (node.getNodeType())
        {

            case Node.DOCUMENT_NODE :
            {
                Document doc   = ( Document ) node;
                Node     child = doc.getFirstChild();

                while (child != null)
                {
                    stripDuplicateAttributes(child, node);
                    child = child.getNextSibling();
                }
                break;
            }
            case Node.ELEMENT_NODE :
            {
                Element      elt              = ( Element ) node;
                NamedNodeMap attrs            = elt.getAttributes();
                ArrayList    nodesToRemove    = new ArrayList();
                int          nodesToRemoveNum = 0;

                for (int i = 0; i < attrs.getLength(); i++)
                {
                    Node a = attrs.item(i);

                    for (int j = 0; j < attrs.getLength(); j++)
                    {
                        Node b = attrs.item(j);

                        // if there are two attributes with same name
                        if ((i != j)
                                && (a.getNodeName().equals(b.getNodeName())))
                        {
                            nodesToRemove.add(b);
                            nodesToRemoveNum++;
                        }
                    }
                }
                for (int i = 0; i < nodesToRemoveNum; i++)
                {
                    org.w3c.dom.Attr    nodeToDelete       =
                        ( org.w3c.dom.Attr ) nodesToRemove.get(i);
                    org.w3c.dom.Element nodeToDeleteParent =
                        ( org.w3c.dom
                            .Element ) node;   // nodeToDelete.getParentNode();

                    nodeToDeleteParent.removeAttributeNode(nodeToDelete);
                }
                nodesToRemove.clear();
                Node child = elt.getFirstChild();

                while (child != null)
                {
                    stripDuplicateAttributes(child, node);
                    child = child.getNextSibling();
                }
                break;
            }
            default :

                // do nothing
                break;
        }
    }
}