/*
 * 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.Reflection;
using OpenMetaverse;
using log4net;
using Nini.Config;
using OpenSim.Framework;
using OpenSim.Region.Environment.Interfaces;
using OpenSim.Region.Environment.Scenes;

namespace OpenSim.Region.Environment.Modules.Avatar.Groups
{
    public class GroupsModule : IRegionModule
    {
        private static readonly ILog m_log =
            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private Dictionary<UUID, GroupMembershipData> m_GroupMap =
                new Dictionary<UUID, GroupMembershipData>();

        private Dictionary<UUID, IClientAPI> m_ClientMap =
                new Dictionary<UUID, IClientAPI>();

        private UUID opensimulatorGroupID =
                new UUID("00000000-68f9-1111-024e-222222111123");

        private List<Scene> m_SceneList = new List<Scene>();

        private static GroupMembershipData osGroup =
                new GroupMembershipData();

        #region IRegionModule Members

        public void Initialise(Scene scene, IConfigSource config)
        {
            IConfig groupsConfig = config.Configs["Groups"];

            if (groupsConfig == null)
            {
                m_log.Info("[GROUPS] No configuration found. Using defaults");
            }
            else
            {
                if (!groupsConfig.GetBoolean("Enabled", false))
                {
                    m_log.Info("[GROUPS] Groups disabled in configuration");
                    return;
                }

                if (groupsConfig.GetString("Module", "Default") != "Default")
                    return;
            }

            m_log.Info("[GROUPS] Activated default groups module");

            lock (m_SceneList)
            {
                if (!m_SceneList.Contains(scene))
                {
                    if (m_SceneList.Count == 0)
                    {
                        osGroup.GroupID = opensimulatorGroupID;
                        osGroup.GroupName = "OpenSimulator Testing";
                        osGroup.GroupPowers =
                                (uint)(GroupPowers.AllowLandmark |
                                GroupPowers.AllowSetHome);
                        m_GroupMap[opensimulatorGroupID] = osGroup;
                    }
                    m_SceneList.Add(scene);
                }
            }

            scene.EventManager.OnNewClient += OnNewClient;
            scene.EventManager.OnClientClosed += OnClientClosed;
            scene.EventManager.OnGridInstantMessageToGroupsModule +=
                    OnGridInstantMessage;
        }

        public void PostInitialise()
        {
        }

        public void Close()
        {
            m_log.Info("[GROUP]: Shutting down group module.");
            lock (m_ClientMap)
            {
                m_ClientMap.Clear();
            }

            lock (m_GroupMap)
            {
                m_GroupMap.Clear();
            }
        }

        public string Name
        {
            get { return "GroupsModule"; }
        }

        public bool IsSharedModule
        {
            get { return true; }
        }

        #endregion

        private void OnNewClient(IClientAPI client)
        {

            // Subscribe to instant messages
            client.OnInstantMessage += OnInstantMessage;
            client.OnAgentDataUpdateRequest += OnAgentDataUpdateRequest;
            client.OnUUIDGroupNameRequest += HandleUUIDGroupNameRequest;
            lock (m_ClientMap)
            {
                if (!m_ClientMap.ContainsKey(client.AgentId))
                {
                    m_ClientMap.Add(client.AgentId, client);
                }
            }

            m_log.Info("[GROUP]: Adding " + client.Name + " to " +
                    osGroup.GroupName + " ");

            GroupMembershipData[] updateGroups = new GroupMembershipData[1];
            updateGroups[0] = osGroup;

            client.SendGroupMembership(updateGroups);
        }

        private void OnAgentDataUpdateRequest(IClientAPI remoteClient,
                UUID AgentID, UUID SessionID)
        {
            UUID ActiveGroupID;
            string ActiveGroupName;
            uint ActiveGroupPowers;

            string firstname = remoteClient.FirstName;
            string lastname = remoteClient.LastName;

            string ActiveGroupTitle = "I IZ N0T";

            ActiveGroupID = osGroup.GroupID;
            ActiveGroupName = osGroup.GroupName;
            ActiveGroupPowers = osGroup.GroupPowers;

            remoteClient.SendAgentDataUpdate(AgentID, ActiveGroupID, firstname,
                    lastname, ActiveGroupPowers, ActiveGroupName,
                    ActiveGroupTitle);
        }

        private void OnInstantMessage(IClientAPI client, UUID fromAgentID,
                UUID fromAgentSession, UUID toAgentID,
                UUID imSessionID, uint timestamp, string fromAgentName,
                string message, byte dialog, bool fromGroup, byte offline,
                uint ParentEstateID, Vector3 Position, UUID RegionID,
                byte[] binaryBucket)
        {
        }

        private void OnGridInstantMessage(GridInstantMessage msg)
        {
            // Trigger the above event handler
            OnInstantMessage(null, new UUID(msg.fromAgentID),
                    new UUID(msg.fromAgentSession),
                    new UUID(msg.toAgentID), new UUID(msg.imSessionID),
                    msg.timestamp, msg.fromAgentName,
                    msg.message, msg.dialog, msg.fromGroup, msg.offline,
                    msg.ParentEstateID,
                    new Vector3(msg.Position.X, msg.Position.Y, msg.Position.Z),
                    new UUID(msg.RegionID),
                    msg.binaryBucket);
        }

        private void HandleUUIDGroupNameRequest(UUID id,IClientAPI remote_client)
        {
            string groupnamereply = "Unknown";
            UUID groupUUID = UUID.Zero;

            lock (m_GroupMap)
            {
                if (m_GroupMap.ContainsKey(id))
                {
                    GroupMembershipData grp = m_GroupMap[id];
                    groupnamereply = grp.GroupName;
                    groupUUID = grp.GroupID;
                }
            }
            remote_client.SendGroupNameReply(groupUUID, groupnamereply);
        }

        private void OnClientClosed(UUID agentID)
        {
            lock (m_ClientMap)
            {
                if (m_ClientMap.ContainsKey(agentID))
                {
                    IClientAPI cli = m_ClientMap[agentID];
                    if (cli != null)
                    {
                        m_log.Info("[GROUP]: Removing all reference to groups "+
                                "for " + cli.Name);
                    }
                    else
                    {
                        m_log.Info("[GROUP]: Removing all reference to groups "+
                                "for " + agentID.ToString());
                    }
                    m_ClientMap.Remove(agentID);
                }
            }
        }
    }
}