/*
 * 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 log4net;
using System;
using System.Reflection;
using System.Text;
using System.Collections;
 
namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
{
    public class FreeSwitchDirectory 
    {
        private static readonly ILog m_log =
            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
            
        public Hashtable HandleDirectoryRequest(Hashtable request)
        {
             m_log.DebugFormat("[FreeSwitchDirectory] HandleDirectoryRequest called with {0}",request.ToString());
             
             Hashtable response = new Hashtable();
             
             // information in the request we might be interested in
             
             // Request 1 sip_auth for users account
             
             //Event-Calling-Function=sofia_reg_parse_auth
             //Event-Calling-Line-Number=1494
             //action=sip_auth
             //sip_user_agent=Vivox-SDK-2.1.3010.6151-Mac%20(Feb-11-2009/16%3A42%3A41)
             //sip_auth_username=xhZuXKmRpECyr2AARJYyGgg%3D%3D  (==)
             //sip_auth_realm=9.20.151.43
             //sip_contact_user=xhZuXKmRpECyr2AARJYyGgg%3D%3D (==)
             //sip_contact_host=192.168.0.3    // this shouldnt really be a local IP, investigate STUN servers
             //sip_to_user=xhZuXKmRpECyr2AARJYyGgg%3D%3D
             //sip_to_host=9.20.151.43
             //sip_auth_method=REGISTER
             //user=xhZuXKmRpECyr2AARJYyGgg%3D%3D
             //domain=9.20.151.43
             //ip=9.167.220.137    // this is the correct IP rather than sip_contact_host above when through a vpn or NAT setup
             
             foreach(DictionaryEntry item in request)
             {
                m_log.InfoFormat("[FreeSwitchDirectory] requestBody item {0} {1}",item.Key, item.Value);
             }
             
             string eventCallingFunction = (string) request["Event-Calling-Function"];
             
             
             if(eventCallingFunction=="sofia_reg_parse_auth")
             {
                 string sipAuthMethod = (string)request["sip_auth_method"];
	             
	             if(sipAuthMethod=="REGISTER")
	             {
	                 response = HandleRegister(request);
	             } 
	             else if(sipAuthMethod=="INVITE")  
	             {
	                 response = HandleInvite(request);
	             }
	             else
	             {
	                 m_log.ErrorFormat("[FreeSwitchVoice] HandleDirectoryRequest unknown sip_auth_method {0}",sipAuthMethod);
	                 response["int_response_code"]=404;
	             }
             }
	         else if(eventCallingFunction=="switch_xml_locate_user")
	         {
	             response = HandleLocateUser(request);
             }
             else if(eventCallingFunction=="user_data_function") // gets called when an avatar to avatar call is made
             {
                 response = HandleLocateUser(request);
             }
             else if(eventCallingFunction=="user_outgoing_channel")
             {
                 response = HandleRegister(request);
             }
             else if(eventCallingFunction=="config_sofia") // happens once on freeswitch startup
             {
                 response = HandleConfigSofia(request);
             }
             else if(eventCallingFunction=="switch_load_network_lists")
             {
                 //response = HandleLoadNetworkLists(request);
                 response["int_response_code"]=404;
                 response["keepalive"] = false;
             }
             else
             {
                 m_log.ErrorFormat("[FreeSwitchVoice] HandleDirectoryRequest unknown Event-Calling-Function {0}",eventCallingFunction);
                 response["int_response_code"]=404;
                 response["keepalive"] = false;
             }
             
                
             
             return response;   
        }
        
        private Hashtable HandleRegister(Hashtable request)
        {
            m_log.Info("[FreeSwitchDirectory] HandleRegister called");
            
            // TODO the password we return needs to match that sent in the request, this is hard coded for now
            string password = "1234";
            string domain = (string) request["domain"];
            string user = (string) request["user"];
            
            Hashtable response = new Hashtable();
            response["content_type"] = "text/xml";
            response["keepalive"] = false;
            response["int_response_code"]=200;
            response["str_response_string"] = String.Format( 
                "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n" +
                "<document type=\"freeswitch/xml\">\r\n" +
                    "<section name=\"directory\" description=\"User Directory\">\r\n" +
                        "<domain name=\"{0}\">\r\n" +
                            "<user id=\"{1}\">\r\n" +
                                "<params>\r\n" +
                                    "<param name=\"password\" value=\"{2}\" />\r\n" +
                                    "<param name=\"dial-string\" value=\"{{presence_id=${{dialed_user}}@${{dialed_domain}}}}${{sofia_contact(${{dialed_user}}@${{dialed_domain}})}}\"/>\r\n" +
                                "</params>\r\n" +
                                "<variables>\r\n" +
                                    "<variable name=\"user_context\" value=\"default\" />\r\n" +
                                    "<variable name=\"presence_id\" value=\"{1}@{0}\"/>"+
                                "</variables>\r\n" +
                            "</user>\r\n" +
                        "</domain>\r\n" +
                    "</section>\r\n" +
                "</document>\r\n"
                , domain , user, password);
                
            return response;
            
        }
        
        private Hashtable HandleInvite(Hashtable request)
        {
            m_log.Info("[FreeSwitchDirectory] HandleInvite called");
            
            // TODO the password we return needs to match that sent in the request, this is hard coded for now
            string password = "1234";
            string domain = (string) request["domain"];
            string user = (string) request["user"];
            string sipRequestUser = (string) request["sip_request_user"];
            
            Hashtable response = new Hashtable();
            response["content_type"] = "text/xml";
            response["keepalive"] = false;
            response["int_response_code"]=200;
            response["str_response_string"] = String.Format( 
                "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n" +
                "<document type=\"freeswitch/xml\">\r\n" +
                    "<section name=\"directory\" description=\"User Directory\">\r\n" +
                        "<domain name=\"{0}\">\r\n" +
                            "<user id=\"{1}\">\r\n" +
                                "<params>\r\n" +
                                    "<param name=\"password\" value=\"{2}\" />\r\n" +
                                    "<param name=\"dial-string\" value=\"{{presence_id=${1}@${{dialed_domain}}}}${{sofia_contact(${1}@${{dialed_domain}})}}\"/>\r\n" +
                                "</params>\r\n" +
                                "<variables>\r\n" +
                                    "<variable name=\"user_context\" value=\"default\" />\r\n" +
                                    "<variable name=\"presence_id\" value=\"{1}@$${{domain}}\"/>"+
                                "</variables>\r\n" +
                            "</user>\r\n" +
                            "<user id=\"{3}\">\r\n" +
                                "<params>\r\n" +
                                    "<param name=\"password\" value=\"{2}\" />\r\n" +
                                    "<param name=\"dial-string\" value=\"{{presence_id=${3}@${{dialed_domain}}}}${{sofia_contact(${3}@${{dialed_domain}})}}\"/>\r\n" +
                                "</params>\r\n" +
                                "<variables>\r\n" +
                                    "<variable name=\"user_context\" value=\"default\" />\r\n" +
                                    "<variable name=\"presence_id\" value=\"{3}@$${{domain}}\"/>"+
                                "</variables>\r\n" +
                            "</user>\r\n" +
                        "</domain>\r\n" +
                    "</section>\r\n" +
                "</document>\r\n"
                , domain , user, password,sipRequestUser);
                
            return response;
        }
        
        
        private Hashtable HandleLocateUser(Hashtable request)
        {
            m_log.Info("[FreeSwitchDirectory] HandleLocateUser called");
            
            // TODO the password we return needs to match that sent in the request, this is hard coded for now
            string domain = (string) request["domain"];
            string user = (string) request["user"];
            
            Hashtable response = new Hashtable();
            response["content_type"] = "text/xml";
            response["keepalive"] = false;
            response["int_response_code"]=200;
            response["str_response_string"] = String.Format( 
                "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n" +
                "<document type=\"freeswitch/xml\">\r\n" +
                    "<section name=\"directory\" description=\"User Directory\">\r\n" +
                        "<domain name=\"{0}\">\r\n" +
                            "<params>\r\n" +
                                "<param name=\"dial-string\" value=\"{{presence_id=${{dialed_user}}@${{dialed_domain}}}}${{sofia_contact(${{dialed_user}}@${{dialed_domain}})}}\"/>\r\n" +
                            "</params>\r\n" +
                            "<user id=\"{1}\">\r\n" +
                            "<variables>\r\n"+
                              "<variable name=\"default_gateway\" value=\"$${{default_provider}}\"/>\r\n"+
                              "<variable name=\"presence_id\" value=\"{1}@$${{domain}}\"/>"+
                            "</variables>\r\n"+
                            "</user>\r\n" +
                        "</domain>\r\n" +
                    "</section>\r\n" +
                "</document>\r\n"
                , domain , user);
            
            
            
            return response;
        }
       
        private Hashtable HandleConfigSofia(Hashtable request)
        {
            m_log.Info("[FreeSwitchDirectory] HandleConfigSofia called");
            
            // TODO the password we return needs to match that sent in the request, this is hard coded for now
            string domain = (string) request["domain"];
            
            Hashtable response = new Hashtable();
            response["content_type"] = "text/xml";
            response["keepalive"] = false;
            response["int_response_code"]=200;
            response["str_response_string"] = String.Format( 
                "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n" +
                "<document type=\"freeswitch/xml\">\r\n" +
                    "<section name=\"directory\" description=\"User Directory\">\r\n" +
                        "<domain name=\"{0}\">\r\n" +
                            "<params>\r\n" +
                                "<param name=\"dial-string\" value=\"{{presence_id=${{dialed_user}}@${{dialed_domain}}}}${{sofia_contact(${{dialed_user}}@${{dialed_domain}})}}\"/>\r\n" +
                            "</params>\r\n" +
                            "<groups name=\"default\">\r\n"+
                                "<users>\r\n"+
                                    "<user id=\"$${{default_provider}}\">\r\n"+
									    "<gateways>\r\n"+
									      "<gateway name=\"$${{default_provider}}\">\r\n"+
									        "<param name=\"username\" value=\"$${{default_provider_username}}\"/>\r\n"+
									        "<param name=\"password\" value=\"$${{default_provider_password}}\"/>\r\n"+
									        "<param name=\"from-user\" value=\"$${{default_provider_username}}\"/>\r\n"+
									        "<param name=\"from-domain\" value=\"$${{default_provider_from_domain}}\"/>\r\n"+
									        "<param name=\"expire-seconds\" value=\"600\"/>\r\n"+
									        "<param name=\"register\" value=\"$${{default_provider_register}}\"/>\r\n"+
									        "<param name=\"retry-seconds\" value=\"30\"/>\r\n"+
									        "<param name=\"extension\" value=\"$${{default_provider_contact}}\"/>\r\n"+
									        "<param name=\"contact-params\" value=\"domain_name=$${{domain}}\"/>\r\n"+
									        "<param name=\"context\" value=\"public\"/>\r\n"+
									      "</gateway>\r\n"+
									    "</gateways>\r\n"+
									    "<params>\r\n"+
									      "<param name=\"password\" value=\"$${{default_provider_password}}\"/>\r\n"+
									    "</params>\r\n"+
									  "</user>\r\n"+
                                "</users>"+
                            "</groups>\r\n" +
                            "<variables>\r\n"+
                              "<variable name=\"default_gateway\" value=\"$${{default_provider}}\"/>\r\n"+
                            "</variables>\r\n"+
                        "</domain>\r\n" +
                    "</section>\r\n" +
                "</document>\r\n"
                , domain); 
         
             
            return response;    
        }    
        
        private Hashtable HandleLoadNetworkLists(Hashtable request)
        {
            m_log.Info("[FreeSwitchDirectory] HandleLoadNetworkLists called");
            
            // TODO the password we return needs to match that sent in the request, this is hard coded for now
            string domain = (string) request["domain"];
            
            Hashtable response = new Hashtable();
            response["content_type"] = "text/xml";
            response["keepalive"] = false;
            response["int_response_code"]=200;
            response["str_response_string"] = String.Format( 
                "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n" +
                "<document type=\"freeswitch/xml\">\r\n" +
                    "<section name=\"directory\" description=\"User Directory\">\r\n" +
                        "<domain name=\"{0}\">\r\n" +
                            "<params>\r\n" +
                                "<param name=\"dial-string\" value=\"{{presence_id=${{dialed_user}}@${{dialed_domain}}}}${{sofia_contact(${{dialed_user}}@${{dialed_domain}})}}\"/>\r\n" +
                            "</params>\r\n" +
                            "<groups name=\"default\"><users/></groups>\r\n" +
                            "<variables>\r\n"+
                              "<variable name=\"default_gateway\" value=\"$${{default_provider}}\"/>\r\n"+
                            "</variables>\r\n"+
                        "</domain>\r\n" +
                    "</section>\r\n" +
                "</document>\r\n"
                , domain); 
         
             
            return response;    
        }       
       
    }
    
}