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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.Net;
using System.Reflection;
using log4net;
using OpenSim.Framework;
using OpenSim.Region.ClientStack;
using OpenSim.Framework.Communications;
using OpenSim.Framework.Communications.Cache;

namespace OpenSim.Region.Environment
{
    public class ClientStackManager
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private Type plugin;
        private Assembly pluginAssembly;

        public ClientStackManager(string dllName) 
        {
            m_log.Info("[CLIENTSTACK]: Attempting to load " + dllName);

            plugin = null;
            pluginAssembly = Assembly.LoadFrom(dllName);

            foreach (Type pluginType in pluginAssembly.GetTypes())
            {
                if (pluginType.IsPublic)
                {
                    Type typeInterface = pluginType.GetInterface("IClientNetworkServer", true);

                    if (typeInterface != null)
                    {
                        m_log.Info("[CLIENTSTACK]: Added IClientNetworkServer Interface");
                        plugin = pluginType;
                        return;
                    }
                }
            }
        }

        public IClientNetworkServer CreateServer(
            IPAddress _listenIP, ref uint port, int proxyPortOffset, bool allow_alternate_port, ClientStackUserSettings settings,
            AssetCache assetCache, AgentCircuitManager authenticateClass)
        {
            if (plugin != null)
            {
                IClientNetworkServer server =
                    (IClientNetworkServer) Activator.CreateInstance(pluginAssembly.GetType(plugin.ToString()));
                
                server.Initialise(
                    _listenIP, ref port, proxyPortOffset, allow_alternate_port, settings, assetCache, authenticateClass);
                
                return server;
            }
            
            m_log.Error("[CLIENTSTACK]: Couldn't initialize a new server");
            return null;
        }
    }
}