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-module(tda).

-export([associate_request/0, associate_result/1]).
-export([release_request/0, release_result/1]).
-export([associate_abort/1]).
-export([system_status/0, system_status/1]).
-export([client/0, stop/1, loop/1]).

-include("acse.hrl").
-include("rose.hrl").

associate_request() ->
	Ver = #'NewACSEUserInformationForCSTA'{cSTAVersion = [versionFive]},
	{ok, Enc} = acse:encode('ACSEUserInformationForCSTA', {newDefinition, Ver}),
	Pdu = #'AARQ-apdu'{'application-context-name' = {1, 3, 12, 0, 218},
		'user-information' = [#'EXTERNAL'{
			'direct-reference' = {1, 3, 12, 0, 285, 200},
			encoding = {'single-ASN1-type', Enc}}]},
	acse:encode('AARQ-apdu', Pdu).

% Accept
% <<97,47,128,2,7,128,161,7,6,5,43,12,0,129,90,162,3,2,1,0,163,5,161,3,2,1,1,190,20,40,18,6,7,43,12,0,130,29,129,72,160,7,160,5,3,3,0,8,0>>
% Reject
% <<97,25,128,2,7,128,161,7,6,5,43,12,0,129,90,162,3,2,1,1,163,5,161,3,2,1,1>>
associate_result(Bin) ->
	case acse:decode('AARE-apdu', Bin) of
		{ok, Pdu} -> Pdu#'AARE-apdu'.result;
		{error, Reason} -> Reason
	end.

release_request() ->
	acse:encode('RLRQ-apdu', #'RLRQ-apdu'{}).

release_result(Bin) ->
	acse:decode('RLRE-apdu', Bin).

% <<100,3,128,1,0>>
associate_abort(Bin) ->
	{ok, Pdu} = acse:decode('ABRT-apdu', Bin),
	Pdu#'ABRT-apdu'.'abort-source'.

% <<161,12,2,1,1,2,2,0,211,48,3,10,1,2>>
% <<162,11,2,1,1,48,6,2,2,0,211,5,0>>
system_status(Bin) ->
	case rose:decode('ROS', Bin) of
		{ok, {invoke, Invoke}} ->
			{id(Invoke), opcode(Invoke), arg(Invoke)};
		{error, Reason} -> Reason
	end.

opcode(#'Invoke'{opcode = {local, Opcode}}) -> Opcode;
opcode(Any) -> {local, Any}.

id(#'Invoke'{invokeId = {present, Id}}) -> Id;
id(Any) -> {present, Any}.

arg(#'Invoke'{argument = Arg}) -> Arg.

system_status() ->
	RR = #'ReturnResult_result'{opcode = {local, 211}, result = <<5,0>>},
	R = #'ReturnResult'{invokeId = {present, 1}, result = RR},
	io:format("~p~n", [R]),
	case rose:encode('ROS', {returnResult, R}) of
		{ok, Invoke} -> Invoke;
		{error, Reason} -> Reason
	end.

client() ->
	Host = "192.168.240.20",
	case gen_tcp:connect(Host, 33333, [{packet, 2}]) of
		{ok, Sock} -> loop(Sock);
		{error, Reason} -> {error, Reason}
	end.

stop(Sock) -> gen_tcp:close(Sock).

loop(Sock) ->
	Hello = associate_request(),
	%{tcp, Sock} ! Hello,
	gen_tcp:send(Sock, Hello),
	receive
		{tcp, S, Whatever} ->
			io:format(">>> ~p ~p ~n", [S, Whatever]),
			loop(Sock);
		{tcp_closed, S} -> S
	end.