%% -*- erlang -*-
%%
%% cf_client
%%
%% Copyright 2015-2018 Jörgen Brandt
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% -------------------------------------------------------------------
%% @author Jörgen Brandt <joergen.brandt@onlinehome.de>
%% @version 0.1.6
%% @copyright 2015-2018 Jörgen Brandt
%%
%%
%%
%%
%%
%% @end
%% -------------------------------------------------------------------

-module( cf_client_process ).
-behaviour( cre_client ).


%%====================================================================
%% Exports
%%====================================================================

%% CRE client callbacks
-export( [init/1, is_value/2, recv/3, step/2] ).

%% API functions
-export( [start_link/1, start_link/2] ).



-define( CUNEIFORM_SEM, cuneiform_sem_cek ).

-include_lib( "cuneiform.hrl" ).


%%====================================================================
%% API functions
%%====================================================================

start_link( F ) when is_function( F, 0 ) ->
  case F() of
    {ok, CreName} -> start_link( CreName );
    {error, E}    -> {error, E}
  end;

start_link( CreName ) ->
  cre_client:start_link( CreName, ?MODULE, [] ).


start_link( ClientName, F ) when is_function( F, 0 ) ->
  case F() of
    {ok, CreName} -> start_link( ClientName, CreName );
    {error, E}    -> {error, E}
  end;

start_link( Clientname, CreName ) ->
  cre_client:start_link( Clientname, CreName, ?MODULE, [] ).


%%====================================================================
%% CRE client callback implementations
%%====================================================================

-spec init( ClientArg :: _ ) -> [].

init( _ClientArg ) -> [].

-spec is_value( E :: e(), UsrInfo :: _ ) -> boolean().

is_value( {err, _, _, _}, _ ) -> true;

is_value( E, _ ) ->
  cuneiform_sem:is_value( E ).


-spec recv( E, ReplyLst, UsrInfo ) -> e()
when E        :: e(),
     ReplyLst :: [{#{ atom() => _ }, #{ atom() => _ }}],
     UsrInfo  :: _.

recv( E, ReplyLst, _UsrInfo ) ->

  ReplyLst1 = [{AppId, cf_client_effi:effi_reply_to_expr( A, R )}
               || {A = #{ app_id := AppId }, R} <- ReplyLst],

  cuneiform_sem:subst_fut( E, ReplyLst1 ).


-spec step( E, UsrInfo ) -> Result
when E       :: e(),
     UsrInfo :: _,
     Result  :: {ok, e(), [e()]}.

step( E, _UsrInfo ) ->
  ?CUNEIFORM_SEM:step( E ).