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

using Nini.Config;
using OpenSim.Framework;
using OpenSim.Server.Base;
using OpenSim.Services.Interfaces;
using OpenSim.Framework.Servers.HttpServer;
using OpenSim.Server.Handlers.Base;
using GridRegion = OpenSim.Services.Interfaces.GridRegion;

using log4net;
using Nwc.XmlRpc;
using OpenMetaverse;

namespace OpenSim.Server.Handlers.Hypergrid
{
    public class InstantMessageServerConnector : ServiceConnector
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private IInstantMessage m_IMService;

        public InstantMessageServerConnector(IConfigSource config, IHttpServer server) :
            this(config, server, (IInstantMessageSimConnector)null)
        {
        }

        public InstantMessageServerConnector(IConfigSource config, IHttpServer server, string configName) :
            this(config, server)
        {
        }

        public InstantMessageServerConnector(IConfigSource config, IHttpServer server, IInstantMessageSimConnector simConnector) :
                base(config, server, String.Empty)
        {
            IConfig gridConfig = config.Configs["HGInstantMessageService"];
            if (gridConfig != null)
            {
                string serviceDll = gridConfig.GetString("LocalServiceModule", string.Empty);

                Object[] args = new Object[] { config, simConnector };
                m_IMService = ServerUtils.LoadPlugin<IInstantMessage>(serviceDll, args);
            }
            if (m_IMService == null)
                throw new Exception("InstantMessage server connector cannot proceed because of missing service");

            server.AddXmlRPCHandler("grid_instant_message", ProcessInstantMessage, false);

        }

        public IInstantMessage GetService()
        {
            return m_IMService;
        }

        protected virtual XmlRpcResponse ProcessInstantMessage(XmlRpcRequest request, IPEndPoint remoteClient)
        {
            bool successful = false;

            try
            {
                // various rational defaults
                UUID fromAgentID = UUID.Zero;
                UUID toAgentID = UUID.Zero;
                UUID imSessionID = UUID.Zero;
                uint timestamp = 0;
                string fromAgentName = "";
                string message = "";
                byte dialog = (byte)0;
                bool fromGroup = false;
                byte offline = (byte)0;
                uint ParentEstateID = 0;
                Vector3 Position = Vector3.Zero;
                UUID RegionID = UUID.Zero;
                byte[] binaryBucket = Array.Empty<byte>();

                float pos_x = 0;
                float pos_y = 0;
                float pos_z = 0;
                //m_log.Info("Processing IM");


                Hashtable requestData = (Hashtable)request.Params[0];
                // Check if it's got all the data
                if (requestData.ContainsKey("from_agent_id")
                        && requestData.ContainsKey("to_agent_id") && requestData.ContainsKey("im_session_id")
                        && requestData.ContainsKey("timestamp") && requestData.ContainsKey("from_agent_name")
                        && requestData.ContainsKey("message") && requestData.ContainsKey("dialog")
                        && requestData.ContainsKey("from_group")
                        && requestData.ContainsKey("offline") && requestData.ContainsKey("parent_estate_id")
                        && requestData.ContainsKey("position_x") && requestData.ContainsKey("position_y")
                        && requestData.ContainsKey("position_z") && requestData.ContainsKey("region_id")
                        && requestData.ContainsKey("binary_bucket"))
                {
                    // Do the easy way of validating the UUIDs
                    UUID.TryParse((string)requestData["from_agent_id"], out fromAgentID);
                    UUID.TryParse((string)requestData["to_agent_id"], out toAgentID);
                    UUID.TryParse((string)requestData["im_session_id"], out imSessionID);
                    UUID.TryParse((string)requestData["region_id"], out RegionID);
                    try
                    {
                        timestamp = (uint)Convert.ToInt32((string)requestData["timestamp"]);
                    }
                    catch (ArgumentException)
                    {
                    }
                    catch (FormatException)
                    {
                    }
                    catch (OverflowException)
                    {
                    }

                    fromAgentName = (string)requestData["from_agent_name"];
                    message = (string)requestData["message"];
                    if (message == null)
                        message = string.Empty;

                    // Bytes don't transfer well over XMLRPC, so, we Base64 Encode them.
                    string requestData1 = (string)requestData["dialog"];
                    if (string.IsNullOrEmpty(requestData1))
                    {
                        dialog = 0;
                    }
                    else
                    {
                        byte[] dialogdata = Convert.FromBase64String(requestData1);
                        dialog = dialogdata[0];
                    }

                    if ((string)requestData["from_group"] == "TRUE")
                        fromGroup = true;

                    string requestData2 = (string)requestData["offline"];
                    if (String.IsNullOrEmpty(requestData2))
                    {
                        offline = 0;
                    }
                    else
                    {
                        byte[] offlinedata = Convert.FromBase64String(requestData2);
                        offline = offlinedata[0];
                    }

                    try
                    {
                        ParentEstateID = (uint)Convert.ToInt32((string)requestData["parent_estate_id"]);
                    }
                    catch (ArgumentException)
                    {
                    }
                    catch (FormatException)
                    {
                    }
                    catch (OverflowException)
                    {
                    }

                    float.TryParse((string)requestData["position_x"], out pos_x);
                    float.TryParse((string)requestData["position_y"], out pos_y);
                    float.TryParse((string)requestData["position_z"], out pos_z);

                    Position = new Vector3(pos_x, pos_y, pos_z);

                    string requestData3 = (string)requestData["binary_bucket"];
                    if (string.IsNullOrEmpty(requestData3))
                    {
                        binaryBucket = Array.Empty<byte>();
                    }
                    else
                    {
                        binaryBucket = Convert.FromBase64String(requestData3);
                    }

                    // Create a New GridInstantMessageObject the the data
                    GridInstantMessage gim = new GridInstantMessage();
                    gim.fromAgentID = fromAgentID.Guid;
                    gim.fromAgentName = fromAgentName;
                    gim.fromGroup = fromGroup;
                    gim.imSessionID = imSessionID.Guid;
                    gim.RegionID = RegionID.Guid;
                    gim.timestamp = timestamp;
                    gim.toAgentID = toAgentID.Guid;
                    gim.message = message;
                    gim.dialog = dialog;
                    gim.offline = offline;
                    gim.ParentEstateID = ParentEstateID;
                    gim.Position = Position;
                    gim.binaryBucket = binaryBucket;

                    successful = m_IMService.IncomingInstantMessage(gim);

                }
            }
            catch (Exception e)
            {
                m_log.Error("[INSTANT MESSAGE]: Caught unexpected exception:", e);
                successful = false;
            }

            //Send response back to region calling if it was successful
            // calling region uses this to know when to look up a user's location again.
            XmlRpcResponse resp = new XmlRpcResponse();
            Hashtable respdata = new Hashtable();
            respdata["success"] = successful ? "TRUE" : "FALSE";
            resp.Value = respdata;

            return resp;
        }

    }
}