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/*
 * 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.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text.RegularExpressions;
using libsecondlife;
using log4net;
using NHibernate;
using NHibernate.Cfg;
using NHibernate.Mapping.Attributes;
using NHibernate.Tool.hbm2ddl;
using OpenSim.Framework;
using OpenSim.Region.Environment.Interfaces;
using OpenSim.Region.Environment.Scenes;
using Environment=NHibernate.Cfg.Environment;

namespace OpenSim.Data.NHibernate
{
    /// <summary>
    /// A RegionData Interface to the NHibernate database
    /// </summary>
    public class NHibernateRegionData : IRegionDataStore
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private Configuration cfg;
        private ISessionFactory factory;
        private ISession session;

        public void Initialise()
        {
            Initialise("SQLiteDialect;SqliteClientDriver;URI=file:OpenSim.db,version=3", true);
        }

        public void Initialise(string connect, bool persistpriminventories)
        {
            // Split out the dialect, driver, and connect string
            char[] split = {';'};
            string[] parts = connect.Split(split, 3);
            if (parts.Length != 3)
            {
                // TODO: make this a real exception type
                throw new Exception("Malformed Inventory connection string '" + connect + "'");
            }

            string dialect = parts[0];

            // NHibernate setup
            cfg = new Configuration();
            cfg.SetProperty(Environment.ConnectionProvider,
                            "NHibernate.Connection.DriverConnectionProvider");
            cfg.SetProperty(Environment.Dialect,
                            "NHibernate.Dialect." + dialect);
            cfg.SetProperty(Environment.ConnectionDriver,
                            "NHibernate.Driver." + parts[1]);
            cfg.SetProperty(Environment.ConnectionString, parts[2]);
            cfg.AddAssembly("OpenSim.Data.NHibernate");

            HbmSerializer.Default.Validate = true;
            using (MemoryStream stream =
                   HbmSerializer.Default.Serialize(Assembly.GetExecutingAssembly()))
                cfg.AddInputStream(stream);
            
            factory  = cfg.BuildSessionFactory();
            session = factory.OpenSession();
            
            // This actually does the roll forward assembly stuff
            Assembly assem = GetType().Assembly;
            Migration m = new Migration((System.Data.Common.DbConnection)factory.ConnectionProvider.GetConnection(), assem, dialect, "AssetStore");
            m.Update();
        }

        /***********************************************************************
         *
         *  Public Interface Functions
         *
         **********************************************************************/

        public void StoreRegionSettings(RegionSettings rs)
        {
        }

        public RegionSettings LoadRegionSettings(LLUUID regionUUID)
        {
            return null;
        }

        /// <summary>
        /// Adds an object into region storage
        /// </summary>
        /// <param name="obj">the object</param>
        /// <param name="regionUUID">the region UUID</param>
        public void StoreObject(SceneObjectGroup obj, LLUUID regionUUID)
        {

        }

        /// <summary>
        /// Removes an object from region storage
        /// </summary>
        /// <param name="obj">the object</param>
        /// <param name="regionUUID">the region UUID</param>
        public void RemoveObject(LLUUID obj, LLUUID regionUUID)
        {
            m_log.InfoFormat("[REGION DB]: Removing obj: {0} from region: {1}", obj.UUID, regionUUID);

        }

        /// <summary>
        /// Load persisted objects from region storage.
        /// </summary>
        /// <param name="regionUUID">The region UUID</param>
        /// <returns>List of loaded groups</returns>
        public List<SceneObjectGroup> LoadObjects(LLUUID regionUUID)
        {
            List<SceneObjectGroup> prims = new List<SceneObjectGroup>();
            return prims;
        }

        /// <summary>
        /// Store a terrain revision in region storage
        /// </summary>
        /// <param name="ter">terrain heightfield</param>
        /// <param name="regionID">region UUID</param>
        public void StoreTerrain(double[,] ter, LLUUID regionID)
        {

        }

        /// <summary>
        /// Load the latest terrain revision from region storage
        /// </summary>
        /// <param name="regionID">the region UUID</param>
        /// <returns>Heightfield data</returns>
        public double[,] LoadTerrain(LLUUID regionID)
        {
            double[,] terret = new double[256,256];
            terret.Initialize();

            
            return terret;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="globalID"></param>
        public void RemoveLandObject(LLUUID globalID)
        {

        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="parcel"></param>
        public void StoreLandObject(ILandObject parcel)
        {

        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="regionUUID"></param>
        /// <returns></returns>
        public List<LandData> LoadLandObjects(LLUUID regionUUID)
        {
            List<LandData> landDataForRegion = new List<LandData>();

            return landDataForRegion;
        }


        /// <summary>
        /// See <see cref="Commit"/>
        /// </summary>
        public void Shutdown()
        {
            
        }
        
        /// <summary>
        /// Load a region banlist
        /// </summary>
        /// <param name="regionUUID">the region UUID</param>
        /// <returns>The banlist</returns>
        public List<RegionBanListItem> LoadRegionBanList(LLUUID regionUUID)
        {
            List<RegionBanListItem> regionbanlist = new List<RegionBanListItem>();

            return regionbanlist;
        }

        /// <summary>
        /// Add en entry into region banlist
        /// </summary>
        /// <param name="item"></param>
        public void AddToRegionBanlist(RegionBanListItem item)
        {

        }

        /// <summary>
        /// remove an entry from the region banlist
        /// </summary>
        /// <param name="item"></param>
        public void RemoveFromRegionBanlist(RegionBanListItem item)
        {

        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        private static Array serializeTerrain(double[,] val)
        {
            MemoryStream str = new MemoryStream(65536*sizeof (double));
            BinaryWriter bw = new BinaryWriter(str);

            // TODO: COMPATIBILITY - Add byte-order conversions
            for (int x = 0; x < 256; x++)
                for (int y = 0; y < 256; y++)
                    bw.Write(val[x, y]);

            return str.ToArray();
        }

        /// <summary>
        /// see IRegionDatastore
        /// </summary>
        /// <param name="primID"></param>
        /// <param name="items"></param>
        public void StorePrimInventory(LLUUID primID, ICollection<TaskInventoryItem> items)
        {

        }
    }
}