/*
* 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;
using System.IO;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
using libsecondlife;
using OpenSim.Framework;
using OpenSim.Framework.Console;
using OpenSim.Framework.Servers;
using OpenSim.Framework.Statistics;

namespace OpenSim.Grid.AssetServer
{
    public class GetAssetStreamHandler : BaseStreamHandler
    {
        private OpenAsset_Main m_assetManager;
        private IAssetProvider m_assetProvider;
        private AssetStatsReporter m_stats;

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="assetManager"></param>
        /// <param name="assetProvider"></param>
        /// <param name="stats">Can be null if stats collection isn't required</param>
        public GetAssetStreamHandler(OpenAsset_Main assetManager, IAssetProvider assetProvider,
                                     AssetStatsReporter stats)
            : base("GET", "/assets")
        {
            MainLog.Instance.Verbose("REST", "In Get Request");
            m_assetManager = assetManager;
            m_assetProvider = assetProvider;
            m_stats = stats;
        }
        
        public override byte[] Handle(string path, Stream request)
        {
            string param = GetParam(path);
            byte[] result = new byte[] {};
            try
            {
                string[] p = param.Split(new char[] {'/', '?', '&'}, StringSplitOptions.RemoveEmptyEntries);

                if (p.Length > 0)
                {
                    LLUUID assetID = null;    
                    
                    if (!LLUUID.TryParse(p[0], out assetID))
                    {
                        MainLog.Instance.Verbose(
                            "REST", "GET:/asset ignoring request with malformed UUID {0}", p[0]);
                        return result;
                    }   
    
                    if (m_stats != null)
                        m_stats.AddRequest();
                    
                    AssetBase asset = m_assetProvider.FetchAsset(assetID);
                    if (asset != null)
                    {
                        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();
                        
                        MainLog.Instance.Verbose(
                            "REST", 
                            "GET:/asset found {0} with name {1}, size {2} bytes",
                            assetID, asset.Name, result.Length);

                        Array.Resize<byte>(ref result, (int) ms.Length);
                    }
                    else
                    {
                        if (m_stats != null)
                            m_stats.AddNotFoundRequest();
                        
                        MainLog.Instance.Verbose("REST", "GET:/asset failed to find {0}", assetID);
                    }
                }
            }
            catch (Exception e)
            {
                MainLog.Instance.Error(e.ToString());
            }
            return result;
        }
    }

    public class PostAssetStreamHandler : BaseStreamHandler
    {
        private OpenAsset_Main m_assetManager;
        private IAssetProvider m_assetProvider;

        public override byte[] Handle(string path, Stream request)
        {
            string param = GetParam(path);

            LLUUID assetId;
            if (param.Length > 0)
                LLUUID.TryParse(param, out assetId);
            byte[] txBuffer = new byte[4096];

            XmlSerializer xs = new XmlSerializer(typeof (AssetBase));
            AssetBase asset = (AssetBase) xs.Deserialize(request);

            MainLog.Instance.Verbose("REST", "StoreAndCommitAsset {0}", asset.FullID);
            m_assetProvider.CreateAsset(asset);
            m_assetProvider.CommitAssets();

            return new byte[] {};
        }

        public PostAssetStreamHandler(OpenAsset_Main assetManager, IAssetProvider assetProvider)
            : base("POST", "/assets")
        {
            m_assetManager = assetManager;
            m_assetProvider = assetProvider;
        }
    }
}