-module(ebb_worker_bridge).

-behaviour(supervisor_bridge).

%% API
-export([start_link/3, start_link/4]).

%% supervisor_bridge callbacks
-export([init/1, terminate/2]).

-define(SERVER, ?MODULE).

-record(state, {mode, worker}).

%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the supervisor bridge
%%--------------------------------------------------------------------
start_link(Func, Args, Receiver) ->
    supervisor_bridge:start_link(?MODULE, {Func, Args, Receiver}).

start_link(distributed, Func, Args, Receiver) ->
    Node = ebb_work_manager:available_node(),
    ebb_work_manager:start_work(Node),
    start_link(Node, Func, Args, Receiver);
start_link(Node, Func, Args, Receiver) ->
    supervisor_bridge:start_link(?MODULE, {Node, Func, Args, Receiver}).

%%====================================================================
%% supervisor_bridge callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Funcion: init(Args) -> {ok,  Pid, State} |
%%                        ignore            |
%%                        {error, Reason}    
%% Description:Creates a supervisor_bridge process, linked to the calling
%% process, which calls Module:init/1 to start the subsystem. To ensure a
%% synchronized start-up procedure, this function does not return until
%% Module:init/1 has returned. 
%%--------------------------------------------------------------------
init({Func, Args, Receiver}) ->
    case ebb_worker:start_link(Func, Args, Receiver) of
	{ok, Pid} ->
	    {ok, Pid, #state{mode=local, worker=Pid}};
	Error ->
	    Error
    end;
init({Node, Func, Args, Receiver}) ->
    case ebb_worker:start_link(Node, Func, Args, Receiver) of
	{ok, Pid} ->
	    {ok, Pid, #state{mode={distributed, Node}, worker=Pid}};
	Error ->
	    Error
    end.

%%--------------------------------------------------------------------
%% Func: terminate(Reason, State) -> void()
%% Description:This function is called by the supervisor_bridge when it is
%% about to terminate. It should be the opposite of Module:init/1 and stop
%% the subsystem and do any necessary cleaning up.The return value is ignored.
%%--------------------------------------------------------------------
terminate(_Reason, #state{mode=local}) ->
    ok;
terminate(_Reason, #state{mode={distributed, Node}}) ->
    ebb_work_manager:work_finished(Node),
    ok.

%%====================================================================
%% Internal functions
%%====================================================================