%%% @doc
%%% front end web development lab
%%% @end

-module(fewd).
-vsn("0.1.0").
-behavior(application).
-author("Peter Harpending <peterharpending@qpq.swiss>").
-copyright("Peter Harpending <peterharpending@qpq.swiss>").
-license("BSD-2-Clause-FreeBSD").

-export([listen/1, ignore/0]).
-export([start/2, stop/1]).

-include("$zx_include/zx_logger.hrl").


-spec listen(PortNum) -> Result
    when PortNum :: inet:port_num(),
         Result  :: ok
                  | {error, {listening, inet:port_num()}}.
%% @doc
%% Make the server start listening on a port.
%% Returns an {error, Reason} tuple if it is already listening.

listen(PortNum) ->
    fd_http:listen(PortNum).


-spec ignore() -> ok.
%% @doc
%% Make the server stop listening if it is, or continue to do nothing if it isn't.

ignore() ->
    fd_http:ignore().


-spec start(normal, term()) -> {ok, pid()}.
%% @private
%% Called by OTP to kick things off. This is for the use of the "application" part of
%% OTP, not to be called by user code.
%% See: http://erlang.org/doc/apps/kernel/application.html

start(normal, _Args) ->
    Result = fd_sup:start_link(),
    ok = listen(8000),
    Result.


-spec stop(term()) -> ok.
%% @private
%% Similar to start/2 above, this is to be called by the "application" part of OTP,
%% not client code. Causes a (hopefully graceful) shutdown of the application.

stop(_State) ->
    ok.