%%%----------------------------------------------------------------------
%%% File    : mod_configure2.erl
%%% Author  : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Support for online configuration of ejabberd
%%% Created : 26 Oct 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2013   ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------

-module(mod_configure2).

-author('alexey@process-one.net').

-behaviour(gen_mod).

-export([start/2, stop/1, process_local_iq/3]).

-include("ejabberd.hrl").

-include("jlib.hrl").

-define(NS_ECONFIGURE,
	<<"http://ejabberd.jabberstudio.org/protocol/con"
	  "figure">>).

start(Host, Opts) ->
    IQDisc = gen_mod:get_opt(iqdisc, Opts, fun gen_iq_handler:check_type/1,
                             one_queue),
    gen_iq_handler:add_iq_handler(ejabberd_local, Host,
				  ?NS_ECONFIGURE, ?MODULE, process_local_iq,
				  IQDisc),
    ok.

stop(Host) ->
    gen_iq_handler:remove_iq_handler(ejabberd_local, Host,
				     ?NS_ECONFIGURE).

process_local_iq(From, To,
		 #iq{type = Type, lang = _Lang, sub_el = SubEl} = IQ) ->
    case acl:match_rule(To#jid.lserver, configure, From) of
      deny ->
	  IQ#iq{type = error, sub_el = [SubEl, ?ERR_NOT_ALLOWED]};
      allow ->
	  case Type of
	    set ->
		IQ#iq{type = error,
		      sub_el = [SubEl, ?ERR_FEATURE_NOT_IMPLEMENTED]};
	    %%case xml:get_tag_attr_s("type", SubEl) of
	    %%    "cancel" ->
	    %%        IQ#iq{type = result,
	    %%		   sub_el = [{xmlelement, "query",
	    %%			      [{"xmlns", XMLNS}], []}]};
	    %%    "submit" ->
	    %%        XData = jlib:parse_xdata_submit(SubEl),
	    %%        case XData of
	    %%    	invalid ->
	    %%    	    IQ#iq{type = error,
	    %%			  sub_el = [SubEl, ?ERR_BAD_REQUEST]};
	    %%    	_ ->
	    %%    	    Node =
	    %%    		string:tokens(
	    %%    		  xml:get_tag_attr_s("node", SubEl),
	    %%    		  "/"),
	    %%    	    case set_form(Node, Lang, XData) of
	    %%    		{result, Res} ->
	    %%    		    IQ#iq{type = result,
	    %%				  sub_el = [{xmlelement, "query",
	    %%					     [{"xmlns", XMLNS}],
	    %%					     Res
	    %%					    }]};
	    %%    		{error, Error} ->
	    %%    		    IQ#iq{type = error,
	    %%				  sub_el = [SubEl, Error]}
	    %%    	    end
	    %%        end;
	    %%    _ ->
	    %%        IQ#iq{type = error,
	    %%		   sub_el = [SubEl, ?ERR_NOT_ALLOWED]}
	    %%end;
	    get ->
		case process_get(SubEl) of
		  {result, Res} -> IQ#iq{type = result, sub_el = [Res]};
		  {error, Error} ->
		      IQ#iq{type = error, sub_el = [SubEl, Error]}
		end
	  end
    end.

process_get(#xmlel{name = <<"info">>}) ->
    S2SConns = ejabberd_s2s:dirty_get_connections(),
    TConns = lists:usort([element(2, C) || C <- S2SConns]),
    Attrs = [{<<"registered-users">>,
	      iolist_to_binary(integer_to_list(mnesia:table_info(passwd,
								 size)))},
	     {<<"online-users">>,
	      iolist_to_binary(integer_to_list(mnesia:table_info(presence,
								 size)))},
	     {<<"running-nodes">>,
	      iolist_to_binary(integer_to_list(length(mnesia:system_info(running_db_nodes))))},
	     {<<"stopped-nodes">>,
	      iolist_to_binary(integer_to_list(length(lists:usort(mnesia:system_info(db_nodes)
								     ++
								     mnesia:system_info(extra_db_nodes))
							 --
							 mnesia:system_info(running_db_nodes))))},
	     {<<"outgoing-s2s-servers">>,
	      iolist_to_binary(integer_to_list(length(TConns)))}],
    {result,
     #xmlel{name = <<"info">>,
	    attrs = [{<<"xmlns">>, ?NS_ECONFIGURE} | Attrs],
	    children = []}};
process_get(#xmlel{name = <<"welcome-message">>,
		   attrs = Attrs}) ->
    {Subj, Body} = ejabberd_config:get_local_option(
                     welcome_message,
                     fun({Subj, Body}) ->
                             {iolist_to_binary(Subj),
                              iolist_to_binary(Body)}
                     end,
                     {<<"">>, <<"">>}),
    {result,
     #xmlel{name = <<"welcome-message">>, attrs = Attrs,
	    children =
		[#xmlel{name = <<"subject">>, attrs = [],
			children = [{xmlcdata, Subj}]},
		 #xmlel{name = <<"body">>, attrs = [],
			children = [{xmlcdata, Body}]}]}};
process_get(#xmlel{name = <<"registration-watchers">>,
		   attrs = Attrs}) ->
    SubEls = ejabberd_config:get_local_option(
               registration_watchers,
               fun(JIDs) when is_list(JIDs) ->
                       lists:map(
                         fun(J) ->
                                 #xmlel{name = <<"jid">>, attrs = [],
                                        children = [{xmlcdata,
                                                     iolist_to_binary(J)}]}
                         end, JIDs)
               end, []),
    {result,
     #xmlel{name = <<"registration_watchers">>,
	    attrs = Attrs, children = SubEls}};
process_get(#xmlel{name = <<"acls">>, attrs = Attrs}) ->
    Str = iolist_to_binary(io_lib:format("~p.",
					 [ets:tab2list(acl)])),
    {result,
     #xmlel{name = <<"acls">>, attrs = Attrs,
	    children = [{xmlcdata, Str}]}};
process_get(#xmlel{name = <<"access">>,
		   attrs = Attrs}) ->
    Str = iolist_to_binary(io_lib:format("~p.",
					 [ets:select(config,
						     [{{config, {access, '$1'},
							'$2'},
						       [],
						       [{{access, '$1',
							  '$2'}}]}])])),
    {result,
     #xmlel{name = <<"access">>, attrs = Attrs,
	    children = [{xmlcdata, Str}]}};
process_get(#xmlel{name = <<"last">>, attrs = Attrs}) ->
    case catch mnesia:dirty_select(last_activity,
				   [{{last_activity, '_', '$1', '_'}, [],
				     ['$1']}])
	of
      {'EXIT', _Reason} ->
	  {error, ?ERR_INTERNAL_SERVER_ERROR};
      Vals ->
	  {MegaSecs, Secs, _MicroSecs} = now(),
	  TimeStamp = MegaSecs * 1000000 + Secs,
	  Str = list_to_binary(
                  [[jlib:integer_to_binary(TimeStamp - V),
                    <<" ">>] || V <- Vals]),
	  {result,
	   #xmlel{name = <<"last">>, attrs = Attrs,
		  children = [{xmlcdata, Str}]}}
    end;
%%process_get({xmlelement, Name, Attrs, SubEls}) ->
%%    {result, };
process_get(_) -> {error, ?ERR_BAD_REQUEST}.