/*
 * 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.Collections.Generic;
using System.Reflection;

using OpenSim.Framework;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Services.Interfaces;

using OpenMetaverse;
using log4net;

namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.GridUser
{
    public class ActivityDetector
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private IGridUserService m_GridUserService;

        public ActivityDetector(IGridUserService guservice)
        {
            m_GridUserService = guservice;
            m_log.DebugFormat("[ACTIVITY DETECTOR]: starting ");
        }

        public void AddRegion(Scene scene)
        {
            // For now the only events we listen to are these
            // But we could trigger the position update more often
            scene.EventManager.OnMakeRootAgent += OnMakeRootAgent;
            scene.EventManager.OnNewClient += OnNewClient;
        }

        public void RemoveRegion(Scene scene)
        {
            scene.EventManager.OnMakeRootAgent -= OnMakeRootAgent;
            scene.EventManager.OnNewClient -= OnNewClient;
        }

       public void OnMakeRootAgent(ScenePresence sp)
       {
            if (sp.IsNPC)
                return;

            if(sp.gotCrossUpdate)
            {
                Util.FireAndForget(delegate
                {
                    DoOnMakeRootAgent(sp);
                }, null, "ActivityDetector_MakeRoot");
            }
            else
                DoOnMakeRootAgent(sp);
       }

        public void DoOnMakeRootAgent(ScenePresence sp)
        {
            string userid;
            //m_log.DebugFormat("[ACTIVITY DETECTOR]: Detected root presence {0} in {1}", userid, sp.Scene.RegionInfo.RegionName);
            if (sp.Scene.UserManagementModule.GetUserUUI(sp.UUID, out userid))
            {
                /* we only setposition on known agents that have a valid lookup */
                m_GridUserService.SetLastPosition(
                    userid, UUID.Zero, sp.Scene.RegionInfo.RegionID, sp.AbsolutePosition, sp.Lookat);
            }
        }

        public void OnNewClient(IClientAPI client)
        {
            client.OnConnectionClosed += OnConnectionClose;
        }

        public void OnConnectionClose(IClientAPI client)
        {
            if (client == null)
                return;
            if (client.SceneAgent == null)
                return;

            if (client.SceneAgent.IsChildAgent)
                return;

            string userId;
            /* without scene we cannot logout correctly at all since we do not know how to send the loggedout message then */
            if (client.Scene is Scene)
            {
                Scene s = (Scene)client.Scene;
                userId = s.UserManagementModule.GetUserUUI(client.AgentId);
                if(s.UserManagementModule.GetUserUUI(client.AgentId, out userId))
                {
                    m_GridUserService.LoggedOut(
                        userId, client.SessionId, client.Scene.RegionInfo.RegionID,
                        client.SceneAgent.AbsolutePosition, client.SceneAgent.Lookat);
                }
            }

        }
    }
}