/*
 * 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;
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 * 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.Data;
using System.Reflection;
using libsecondlife;
using NHibernate;
using NHibernate.Cfg;
using NHibernate.Tool.hbm2ddl;
using NHibernate.Mapping.Attributes;
using OpenSim.Data;
using OpenSim.Framework;
using OpenSim.Framework.Console;
using Environment = NHibernate.Cfg.Environment;

namespace OpenSim.Data.NHibernate
{
    /// <summary>
    /// A User storage interface for the DB4o database system
    /// </summary>
    public class NHibernateAssetData : AssetDataBase, IDisposable
    {
        private static readonly log4net.ILog m_log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        private ISessionFactory factory;

        public override void Initialise()
        {
            // TODO: hard coding for sqlite based stuff to begin with, just making it easier to test

            // This is stubbing for now, it will become dynamic later and support different db backends
            Configuration cfg = new Configuration();
            cfg.SetProperty(Environment.ConnectionProvider, 
                            "NHibernate.Connection.DriverConnectionProvider");
            cfg.SetProperty(Environment.Dialect, 
                            "NHibernate.Dialect.SQLiteDialect");
            cfg.SetProperty(Environment.ConnectionDriver, 
                            "NHibernate.Driver.SqliteClientDriver");
            cfg.SetProperty(Environment.ConnectionString,
                            "URI=file:Asset.db,version=3");
            cfg.AddAssembly("OpenSim.Data.NHibernate");

            // HbmSerializer.Default.Validate = true;
//             using ( System.IO.MemoryStream stream = 
//                     HbmSerializer.Default.Serialize(System.Reflection.Assembly.GetExecutingAssembly()))
//                 cfg.AddInputStream(stream);

//             new SchemaExport(cfg).Create(true, true);

            factory = cfg.BuildSessionFactory();
                        
        }

        override public AssetBase FetchAsset(LLUUID uuid)
        {
            return null;
        }

        override public void CreateAsset(AssetBase asset)
        {
            ISession session = null;
            ITransaction transaction = null;
            try {
                session = factory.OpenSession();
                transaction = session.BeginTransaction();

                session.SaveOrUpdate(asset);
                // CRUD operations here (with the session)
                transaction.Commit();
            }
            catch {
                if(transaction != null)
                    transaction.Rollback();
                throw; // Don't trap the exception
            }
            finally {
                if(session != null)
                    session.Close();
            }
        }

        override public void UpdateAsset(AssetBase asset)
        {

        }

        private void LogAssetLoad(AssetBase asset)
        {
            string temporary = asset.Temporary ? "Temporary" : "Stored";
            string local = asset.Local ? "Local" : "Remote";

            int assetLength = (asset.Data != null) ? asset.Data.Length : 0;

            m_log.Info("[SQLITE]: " +
                                     string.Format("Loaded {6} {5} Asset: [{0}][{3}/{4}] \"{1}\":{2} ({7} bytes)",
                                                   asset.FullID, asset.Name, asset.Description, asset.Type,
                                                   asset.InvType, temporary, local, assetLength));
        }

        override public bool ExistsAsset(LLUUID uuid)
        {
            return false;
        }

        public void DeleteAsset(LLUUID uuid)
        {

        }

        override public void CommitAssets() // force a sync to the database
        {
            m_log.Info("[SQLITE]: Attempting commit");
        }


        public override string Name {
            get { return "NHibernate"; }
        }

        public override string Version {
            get { return "0.1"; }
        }

        public void Dispose()
        {

        }
    }
}