%% Stub modules for Erlang supervision tree
%% Note: knhk_sigma, knhk_q, knhk_ingest, and knhk_lockchain are now in separate files
%% These remaining modules will be fully implemented in subsequent phases

-module(knhk_unrdf).
-behaviour(gen_server).
-export([start_link/0, query/1]).

start_link() -> gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) -> {ok, #{sparql_endpoint => "http://localhost:8080/sparql"}}.

handle_call({query, SparqlQuery}, _From, State) ->
    Endpoint = maps:get(sparql_endpoint, State),
    % Route to external SPARQL endpoint via HTTP
    % Production implementation using httpc (standard library)
    case httpc:request(post, {
        Endpoint,
        [{"Content-Type", "application/sparql-query"}],
        "application/sparql-query",
        SparqlQuery
    }, [{timeout, 30000}], []) of
        {ok, {{_, StatusCode, _}, _Headers, Body}} when StatusCode >= 200, StatusCode < 300 ->
            {reply, {ok, #{endpoint => Endpoint, query => SparqlQuery, response => Body}}, State};
        {ok, {{_, StatusCode, _}, _Headers, Body}} ->
            {reply, {error, #{status => StatusCode, body => Body}}, State};
        {error, Reason} ->
            {reply, {error, #{reason => Reason, endpoint => Endpoint}}, State}
    end;
handle_call(_Request, _From, State) -> {reply, {error, unknown}, State}.
handle_cast(_Msg, State) -> {noreply, State}.
handle_info(_Info, State) -> {noreply, State}.

%% API
query(SparqlQuery) ->
    gen_server:call(?MODULE, {query, SparqlQuery}).

-module(knhk_shapes).
-behaviour(gen_server).
-export([start_link/0]).
start_link() -> gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) -> {ok, #{}}.
handle_call(_Request, _From, State) -> {reply, {error, unknown}, State}.


-module(knhk_bus).
-behaviour(gen_server).
-export([start_link/0]).
start_link() -> gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) -> {ok, #{}}.
handle_call(_Request, _From, State) -> {reply, {error, unknown}, State}.

-module(knhk_repl).
-behaviour(gen_server).
-export([start_link/0]).
start_link() -> gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) -> {ok, #{}}.
handle_call(_Request, _From, State) -> {reply, {error, unknown}, State}.

