/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * 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.
 *     * Neither the name of the OpenSim Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 THE 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.
 */

using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Xml;
using libsecondlife;
using log4net;
using OpenSim.Framework;

namespace OpenSim.Region.Environment.Modules.World.Archiver
{
    /// <summary>
    /// Archives assets
    /// </summary>
    public class AssetsArchiver
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        
        /// <summary>
        /// Archive assets
        /// </summary>
        protected IDictionary<LLUUID, AssetBase> m_assets;
        
        public AssetsArchiver(IDictionary<LLUUID, AssetBase> assets)
        {
            m_assets = assets;
        }
        
        /// <summary>
        /// Archive the assets given to this archiver to the given archive.
        /// </summary>
        /// <param name="archive"></param>
        public void Archive(TarArchiveWriter archive)
        {
            WriteMetadata(archive);
            WriteData(archive);
        }

        /// <summary>
        /// Write an assets metadata file to the given archive
        /// </summary>
        /// <param name="archive"></param>
        protected void WriteMetadata(TarArchiveWriter archive)
        {
            StringWriter sw = new StringWriter();
            XmlTextWriter xtw = new XmlTextWriter(sw);
            
            xtw.Formatting = Formatting.Indented;
            xtw.WriteStartDocument();
            
            xtw.WriteStartElement("assets");
            
            foreach (LLUUID uuid in m_assets.Keys)
            {
                AssetBase asset = m_assets[uuid];
                
                if (asset != null)
                {
                    xtw.WriteStartElement("asset");
                    
                    string extension = string.Empty;
                    
                    if ((sbyte)AssetType.Texture == asset.Type)
                    {
                        extension = ArchiveConstants.TEXTURE_EXTENSION;
                    }
                    
                    xtw.WriteElementString("filename", uuid.ToString() + extension);
                    
                    xtw.WriteElementString("name", asset.Name);
                    xtw.WriteElementString("description", asset.Description);
                    xtw.WriteElementString("asset-type", asset.Type.ToString());
                    xtw.WriteElementString("inventory-type", asset.InvType.ToString());
                    
                    xtw.WriteEndElement();
                }
            }
            
            xtw.WriteEndElement();
            
            xtw.WriteEndDocument();
            
            archive.AddFile("assets.xml", sw.ToString());
        }
        
        /// <summary>
        /// Write asset data files to the given archive
        /// </summary>
        /// <param name="archive"></param>
        protected void WriteData(TarArchiveWriter archive)
        {
            // It appears that gtar, at least, doesn't need the intermediate directory entries in the tar
            //archive.AddDir("assets");
            
            foreach (LLUUID uuid in m_assets.Keys)
            {
                AssetBase asset = m_assets[uuid];
                
                if (asset != null)
                {
                    string extension = string.Empty;
                    
                    if ((sbyte)AssetType.Texture == asset.Type)
                    {
                        extension = ArchiveConstants.TEXTURE_EXTENSION;
                    }
                    
                    archive.AddFile(
                        ArchiveConstants.ASSETS_PATH + uuid.ToString() + extension,
                        asset.Data);
                }
                else
                {
                    m_log.DebugFormat("[ARCHIVER]: Could not find asset {0} to archive", uuid);
                }
            }
        }
    }
}
