/*
 * 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 log4net;
using OpenMetaverse;
using OpenSim.Framework;

namespace OpenSim.Region.CoreModules.World.Archiver
{
    /// <summary>
    /// Archives assets
    /// </summary>
    public class AssetsArchiver
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        /// <value>
        /// Post a message to the log every x assets as a progress bar
        /// </value>
        private static int LOG_ASSET_LOAD_NOTIFICATION_INTERVAL = 50;
        
        /// <summary>
        /// Archive assets
        /// </summary>
        protected IDictionary<UUID, AssetBase> m_assets;

        public AssetsArchiver(IDictionary<UUID, 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 (UUID uuid in m_assets.Keys)
            {
                AssetBase asset = m_assets[uuid];

                if (asset != null)
                {
                    xtw.WriteStartElement("asset");

                    string extension = string.Empty;

                    if (ArchiveConstants.ASSET_TYPE_TO_EXTENSION.ContainsKey(asset.Type))
                    {
                        extension = ArchiveConstants.ASSET_TYPE_TO_EXTENSION[asset.Type];
                    }

                    xtw.WriteElementString("filename", uuid.ToString() + extension);

                    xtw.WriteElementString("name", asset.Name);
                    xtw.WriteElementString("description", asset.Description);
                    xtw.WriteElementString("asset-type", asset.Type.ToString());

                    xtw.WriteEndElement();
                }
            }

            xtw.WriteEndElement();

            xtw.WriteEndDocument();

            archive.WriteFile("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");
            
            int assetsAdded = 0;

            foreach (UUID uuid in m_assets.Keys)
            {
                AssetBase asset = m_assets[uuid];

                string extension = string.Empty;

                if (ArchiveConstants.ASSET_TYPE_TO_EXTENSION.ContainsKey(asset.Type))
                {
                    extension = ArchiveConstants.ASSET_TYPE_TO_EXTENSION[asset.Type];
                }
                else
                {
                    m_log.ErrorFormat(
                        "[ARCHIVER]: Unrecognized asset type {0} with uuid {1}.  This asset will be saved but not reloaded",
                        asset.Type, asset.ID);
                }

                archive.WriteFile(
                    ArchiveConstants.ASSETS_PATH + uuid.ToString() + extension,
                    asset.Data);
                
                assetsAdded++;
                
                if (assetsAdded % LOG_ASSET_LOAD_NOTIFICATION_INTERVAL == 0)
                    m_log.InfoFormat("[ARCHIVER]: Added {0} assets to archive", assetsAdded);
            }
            
            if (assetsAdded % LOG_ASSET_LOAD_NOTIFICATION_INTERVAL != 0)
                m_log.InfoFormat("[ARCHIVER]: Added {0} assets to archive", assetsAdded);
        }
    }
}