/*
 * 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 OpenSimulator 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;
using System.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Serialization;
using log4net;
using OpenMetaverse;
using OpenSim.Data;
using OpenSim.Framework;
using OpenSim.Framework.Servers;
using OpenSim.Framework.Statistics;

namespace OpenSim.Framework.Servers
{
    public class GetAssetStreamHandler : BaseStreamHandler
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        // private OpenAsset_Main m_assetManager;
        private IAssetDataPlugin m_assetProvider;

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="assetManager"></param>
        /// <param name="assetProvider"></param>
        public GetAssetStreamHandler(IAssetDataPlugin assetProvider)
            : base("GET", "/assets")
        {
            m_log.Info("[REST]: In Get Request");
            // m_assetManager = assetManager;
            m_assetProvider = assetProvider;
        }

        public override byte[] Handle(string path, Stream request,
                                      OSHttpRequest httpRequest, OSHttpResponse httpResponse)
        {
            string param = GetParam(path);
            byte[] result = new byte[] { };

            string[] p = param.Split(new char[] { '/', '?', '&' }, StringSplitOptions.RemoveEmptyEntries);

            if (p.Length > 0)
            {
                UUID assetID = UUID.Zero;

                if (!UUID.TryParse(p[0], out assetID))
                {
                    m_log.InfoFormat(
                        "[REST]: GET:/asset ignoring request with malformed UUID {0}", p[0]);
                    return result;
                }

                if (StatsManager.AssetStats != null)
                    StatsManager.AssetStats.AddRequest();

                AssetBase asset = m_assetProvider.FetchAsset(assetID);
                if (asset != null)
                {
//                    if (asset.ContainsReferences)
//                    {                       
//                        asset.Data = ProcessOutgoingAssetData(asset.Data);
//                    }

                    XmlSerializer xs = new XmlSerializer(typeof(AssetBase));
                    MemoryStream ms = new MemoryStream();
                    XmlTextWriter xw = new XmlTextWriter(ms, Encoding.UTF8);
                    xw.Formatting = Formatting.Indented;
                    xs.Serialize(xw, asset);
                    xw.Flush();

                    ms.Seek(0, SeekOrigin.Begin);
                    //StreamReader sr = new StreamReader(ms);

                    result = ms.GetBuffer();

                    Array.Resize<byte>(ref result, (int)ms.Length);
                }
                else
                {
                    if (StatsManager.AssetStats != null)
                        StatsManager.AssetStats.AddNotFoundRequest();

                    m_log.InfoFormat("[REST]: GET:/asset failed to find {0}", assetID);
                }
            }

            return result;
        }

        private byte[] ProcessOutgoingAssetData(byte[] assetData)
        {
            string data = Encoding.ASCII.GetString(assetData);

            data = ProcessAssetDataString(data);

            return Encoding.ASCII.GetBytes(data);
        }

        public string ProcessAssetDataString(string data)
        {
            Regex regex = new Regex("(creator_id|owner_id)\\s+(\\S+)");

            // IUserService userService = null;

            data = regex.Replace(data, delegate(Match m)
            {
                string result = String.Empty;

//                string key = m.Groups[1].Captures[0].Value;
//
//                string value = m.Groups[2].Captures[0].Value;
//
//                Guid userUri;
//
//                switch (key)
//                {
//                    case "creator_id":
//                        userUri = new Guid(value);
//                        //         result = "creator_url " + userService(userService, userUri);
//                        break;
//
//                    case "owner_id":
//                        userUri = new Guid(value);
//                        //       result = "owner_url " + ResolveUserUri(userService, userUri);
//                        break;
//                }

                return result;
            });

            return data;
        }
    
    }
}