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-module(tda).

-export([start/0, client/1, stop/0]).

-define(TIMEOUT, 300000).
-define(CONNECT_TIMEOUT, 3000).
-define(HOST, "192.168.240.20").
-define(PORT, 33333).

start() -> register(tda_client, spawn(?MODULE, client, [{dial, ?HOST, ?PORT}])).

stop() -> tda_client ! {logout}.

client({dial, Host, Port}) ->
	io:format("Dial ~p:~p~n", [Host, Port]),
	Conn = gen_tcp:connect(Host, Port,
			       [binary, {active, once}, {packet, 2}],
			       ?CONNECT_TIMEOUT),
	client(Conn);
client({ok, Sock}) ->
	io:format("Connected~n", []),
	tda_client ! {login},
	loop(Sock);
client({error, Reason}) ->
	io:format("Error: ~p~n", [Reason]),
	{error, Reason}.

loop(Sock) ->
	inet:setopts(Sock, [{active, once}]),
	io:format("Loop~n", []),
	receive
		{login} ->
			io:format("Login~n", []),
			{ok, Hello} = acse:associate_request(),
			gen_tcp:send(Sock, Hello),
			loop(Sock);
		{logout} ->
			io:format("Logout~n", []),
			{ok, Bye} = acse:release_request(),
			gen_tcp:send(Sock, Bye),
			loop(Sock);
		{tcp, Sock, Msg} ->
			io:format("Reply ~p~n", [Msg]),
			case decode(Sock, Msg) of
				ok -> loop(Sock);
				error -> gen_tcp:close(Sock),
					 error
			end;
		{tcp_closed, _} ->
			io:format("Connection closed~n", []),
			closed
	after ?TIMEOUT ->
		gen_tcp:close(Sock),
		timeout
	end.

decode(Sock, Msg) ->
	case dispatch(Msg) of
		rose ->
			{ok, Rose} = rose:decode(Msg),
			io:format("ROSE> ~p~n", [Rose]),
			{ok, Result} = rose:dispatch(Rose),
			gen_tcp:send(Sock, Result);
		acse ->
			{ok, Acse} = acse:decode(Msg),
			io:format("ACSE> ~p~n", [Acse]),
			acse:accepted(Acse)
	end.

dispatch(<<Head:8,_/binary>>) ->
	case Head of
		 96 -> acse;
		 97 -> acse;
		 98 -> acse;
		 99 -> acse;
		100 -> acse;
		161 -> rose;
		162 -> rose
	end.