/* ====================================================================
 * 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
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 *
 * 5. Products derived from this software may not be called "Apache",
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 *    prior written permission of the Apache Software Foundation.
 *
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * 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.*;

import java.util.*;

import org.apache.tools.ant.*;
import org.apache.tools.ant.taskdefs.*;
import org.apache.tools.ant.types.*;

/**
 * Add components to the cocoon.xconf
 * This is only a ugly first shot
 *
 * @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
 * @version CVS $Revision$ $Date$
 */

public final class XConfTool
    extends Task
{
    private String configuration;
    private String directory;
    private String extension;

    public void setConfiguration(String configuration)
    {
        this.configuration = configuration;
    }

    public void setDirectory(String directory)
    {
        this.directory = directory;
    }

    public void setExtension(String extension)
    {
        this.extension = extension;
    }

    public void execute()
        throws BuildException
    {
        if (this.configuration == null)
        {
            throw new BuildException("configuration attribute is required",
                                     location);
        }
        if (this.extension == null)
        {
            throw new BuildException("extension attribute is required",
                                     location);
        }
        if (this.directory == null)
        {
            throw new BuildException("directory attribute is required",
                                     location);
        }
        try
        {

            // process recursive
            this.process(new File(this.directory), this.extension,
                         this.configuration);
        }
        catch (IOException ioe)
        {
            throw new BuildException("IOException: " + ioe);
        }
    }

    /**
     * Scan recursive
     */

    private void process(final File directoryFile, final String ext,
                         final String configurationLocation)
        throws IOException, BuildException
    {
        final File[] files = directoryFile.listFiles();

        for (int i = 0; i < files.length; i++)
        {
            if (files[ i ].isDirectory() == true)
            {
                this.process(files[ i ], ext, configurationLocation);
            }
            else
            {
                if (files[ i ].getName().endsWith("." + ext) == true)
                {
                    System.out.println("Reading: "
                                       + files[ i ].getAbsolutePath());
                    final String newComponent =
                        this.load(files[ i ].getAbsolutePath());

                    this.add(configurationLocation, newComponent);
                }
            }
        }
    }

    /**
     * Add entry to sitemap
     */

    private void add(final String configurationLocation,
                     final String newComponent)
        throws IOException
    {
        final String data = load(configurationLocation);

        // first search if component already present:
        if (data.indexOf(newComponent) == -1)
        {
            int pos = data.indexOf("<cocoon");

            if (pos != -1)
            {
                pos = data.indexOf(">", pos);
                if (pos != -1)
                {
                    StringBuffer buffer =
                        new StringBuffer(data.substring(0, pos + 1))
                            .append("\n\n").append(newComponent)
                            .append(data.substring(pos + 1));

                    this.save(configurationLocation, buffer.toString());
                }
            }
        }
    }

    /**
     * Load a file and return the content as a string.
     */

    public String load(String filename)
        throws IOException
    {
        FileInputStream fis;

        fis = new FileInputStream(filename);
        int    available;
        byte[] data = null;
        byte[] tempData;
        byte[] copyData;

        do
        {
            available = 1024;
            tempData  = new byte[ available ];
            available = fis.read(tempData, 0, available);
            if (available > 0)
            {
                copyData = new byte[ ((data == null) ? 0
                                                     : data.length) + available ];
                if (data != null)
                {
                    System.arraycopy(data, 0, copyData, 0, data.length);
                }
                System.arraycopy(tempData, 0, copyData, ((data == null) ? 0
                                                                        : data.length), available);
                data = copyData;
            }
        }
        while (available > 0);
        fis.close();
        return ((data != null) ? new String(data)
                               : "");
    }

    /**
     * Save the string to a file
     */

    public void save(String filename, String data)
        throws IOException
    {
        FileWriter fw = new FileWriter(filename);

        fw.write(data);
        fw.close();
    }
}