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/*
 * Copyright (c) 2008, Christophe Delory
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY CHRISTOPHE DELORY ``AS IS'' AND ANY
 * EXPRESS 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 CHRISTOPHE DELORY 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.
 */
package chameleon.playlist.pls;

import java.io.BufferedWriter;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;

import chameleon.content.Content;
import chameleon.playlist.Media;
import chameleon.playlist.Playlist;
import chameleon.playlist.SpecificPlaylist;
import chameleon.playlist.m3u.Resource;
import chameleon.playlist.SpecificPlaylistProvider;

/**
 * PLS playlist format.
 * The format is essentially that of an INI file structured as follows:
 * 
 * Header
 * 
 * "[playlist]": this tag indicates that it is a playlist file.
 * "NumberOfEntries": this variable indicates the number of tracks.
 * 
 * Track entry (assuming track entry #X)
 * 
 * "FileX": variable defining location of stream.
 * "TitleX": defines track title.
 * "LengthX": length in seconds of track. Value of -1 indicates indefinite.
 * 
 * Footer
 * 
 * "Version": playlist version. Currently only a value of 2 is valid.
 * 
 * 
 * @version $Revision: 91 $
 * @author Christophe Delory
 */
public class PLS implements SpecificPlaylist
{
    /**
     * The provider of this specific playlist.
     */
    private transient SpecificPlaylistProvider _provider = null;

    /**
     * The list of child resources.
     */
    private final List _resources = new ArrayList();

    @Override
    public void setProvider(final SpecificPlaylistProvider provider)
    {
        _provider = provider;
    }

    @Override
    public SpecificPlaylistProvider getProvider()
    {
        return _provider;
    }

    @Override
    public void writeTo(final OutputStream out, final String encoding) throws Exception
    {
        String enc = encoding;

        if (enc == null)
        {
            enc = "UTF-8"; // FIXME US-ASCII?
        }

        final BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out, enc)); // Throws NullPointerException if out is null. May throw UnsupportedEncodingException.

        writer.write("[Playlist]"); // May throw IOException.
        writer.newLine(); // May throw IOException.

        writer.write("NumberOfEntries="); // May throw IOException.

        writer.write(Integer.toString(_resources.size()));
        writer.newLine(); // May throw IOException.

        int i = 1;

        for (Resource resource : _resources)
        {
            writer.write("File"); // May throw IOException.
            writer.write(Integer.toString(i)); // May throw IOException.
            writer.write("="); // May throw IOException.
            writer.write(resource.getLocation()); // May throw NullPointerException, IOException.
            writer.newLine(); // May throw IOException.

            if (resource.getName() != null)
            {
                writer.write("Title"); // May throw IOException.
                writer.write(Integer.toString(i)); // May throw IOException.
                writer.write("="); // May throw IOException.
                writer.write(resource.getName()); // May throw IOException.
                writer.newLine(); // May throw IOException.
            }

            if (resource.getLength() >= 0L)
            {
                writer.write("Length"); // May throw IOException.
                writer.write(Integer.toString(i)); // May throw IOException.
                writer.write("="); // May throw IOException.
                writer.write(Long.toString(resource.getLength())); // May throw IOException.
                writer.newLine(); // May throw IOException.
            }

            i++;
        }

        writer.write("Version=2"); // May throw IOException.
        writer.newLine(); // May throw IOException.

        writer.flush(); // May throw IOException.
    }

    @Override
    public Playlist toPlaylist()
    {
        final Playlist ret = new Playlist();

        for (Resource resource : _resources)
        {
            if (resource.getLocation() != null)
            {
                final Media media = new Media(); // NOPMD Avoid instantiating new objects inside loops
                final Content content = new Content(resource.getLocation()); // NOPMD Avoid instantiating new objects inside loops
                media.setSource(content);
                content.setDuration(resource.getLength() * 1000L);
                ret.getRootSequence().addComponent(media);
            }
        }

        ret.normalize();

        return ret;
    }

    /**
     * Returns the list of playlist resources.
     * @return a list of child resources. May be empty but not null.
     */
    public List getResources()
    {
        return _resources;
    }
}