%% @author Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
%% @copyright (C) 2009-2011 Bart Van Der Meerssche
%%%
%%% 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 3 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, see <http://www.gnu.org/licenses/>.
%%%
%% @doc Supervisor for the flukso application. 

-module(flukso_sup).
-author('Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>').

-behaviour(supervisor).

%% External exports
-export([start_link/0, upgrade/0]).

%% supervisor callbacks
-export([init/1]).

%% @spec start_link() -> ServerRet
%% @doc API for starting the supervisor.
start_link() ->
    supervisor:start_link({local, ?MODULE}, ?MODULE, []).

%% @spec upgrade() -> ok
%% @doc Add processes if necessary.
upgrade() ->
    {ok, {_, Specs}} = init([]),

    Old = sets:from_list(
	    [Name || {Name, _, _, _} <- supervisor:which_children(?MODULE)]),
    New = sets:from_list([Name || {Name, _, _, _, _, _} <- Specs]),
    Kill = sets:subtract(Old, New),

    sets:fold(fun (Id, ok) ->
		      supervisor:terminate_child(?MODULE, Id),
		      supervisor:delete_child(?MODULE, Id),
		      ok
	      end, ok, Kill),

    [supervisor:start_child(?MODULE, Spec) || Spec <- Specs],
    ok.

%% @spec init([]) -> SupervisorTree
%% @doc supervisor callback.
init([]) ->
    Ip = case os:getenv("WEBMACHINE_IP") of false -> "127.0.0.1"; Any -> Any end,
    {ok, Dispatch} = file:consult(filename:join(
                         [filename:dirname(code:which(?MODULE)),
                          "..", "priv", "dispatch.conf"])),
    WebConfig = [
		 {ip, Ip},
		 {port, 9999},
                 {log_dir, "var/log"},
		 {dispatch, Dispatch}],
    Web = {webmachine_mochiweb,
	   {webmachine_mochiweb, start, [WebConfig]},
	   permanent, 5000, worker, dynamic},
    Processes = [Web],
    {ok, {{one_for_one, 10, 10}, Processes}}.