%% @file yapi.yap
%% @brief support yap shell
%%
%:- start_low_level_trace.
 %% :- module(yapi, [
 %% 		 python_ouput/0,
 %% 		 show_answer/2,
 %% 		 show_answer/3,
 %% 		 yap_query/4,
 %% 		 python_query/2,
 %% 		 python_query/3,
 %% 		 python_import/1,
 %% 		 yapi_query/2
 %% 		 ]).

:- yap_flag(verbose, silent).

 :- use_module(library(python)).

:- use_module( library(lists) ).
:- use_module( library(maplist) ).
:- use_module( library(rbtrees) ).
:- use_module( library(terms) ).


:- python_import(yap4py.yapi).
:- python_import(json).
%:- python_import(gc).

:- meta_predicate( yapi_query(:,+) ).

%:- start_low_level_trace.

%% @pred yapi_query( + VarList, - Dictionary)
%%
%% dictionary, Examples
%%
%%
yapi_query( VarNames, Self ) :-
		show_answer(VarNames, Dict),
		Self.bindings := Dict.


%:- initialization set_preds.

set_preds :-
fail,
	current_predicate(P, Q),
	functor(Q,P,A),

 	current_predicate(P, Q),
 	functor(Q,P,A),
	atom_string(P,S),
	catch(
	      := yap4py.yapi.named( S, A),
	      _,
	      fail),
	fail.
set_preds :-
fail,
	system_predicate(P/A),
	atom_string(P,S),
	catch(
	      := yap4py.yapi.named( S, A),
	      _,
	      fail),
	fail.
set_preds.

argi(N,I,I1) :-
    atomic_concat(`A`,I,N),
	I1 is I+1.

python_query( Caller, String ) :-
	atomic_to_term( String, Goal, VarNames ),
	query_to_answer( Goal, _, Status, VarNames, Bindings),
	Caller.port := Status,
	       output(Caller, Bindings).

output( _, Bindings ) :-
    write_query_answer( Bindings ),
    fail.
output( Caller, Bindings ) :-
    answer := {},
    foldl(ground_dict(answer), Bindings, [], Ts),
    term_variables( Ts, Hidden),
    foldl(bv, Hidden , 0, _),
    maplist(into_dict(answer),Ts),
    Caller.answer := json.dumps(answer),
    S := Caller.answer,
		format(user_error, '~nor ~s~n~n',S),
		fail.
output(_Caller, _Bindings).

bv(V,I,I1) :-
    atomic_concat(['__',I],V),
    I1 is I+1.

into_dict(D,V0=T) :-
    python_represents(D[V0], T).
    
/**
 *
 */
ground_dict(_Dict,var([_V]), I, I) :-
    !.
ground_dict(_Dict,var([V,V]), I, I) :- 
    !.
ground_dict(Dict, nonvar([V0|Vs],T),I0, [V0=T| I0]) :-
    !,
    ground_dict(Dict, var([V0|Vs]),I0, I0).
ground_dict(Dict, var([V0,V1|Vs]), I, I) :- 
    !,
		Dict[V1] := V0,
		ground_dict(Dict, var([V0|Vs]), I, I).