%% index_handler.erl
-module(index_handler).
-behaviour(cowboy_handler).
-export([init/2]).

init(Req, State) ->
    {ok, Body, Req2} = cowboy_req:read_body(Req),
    Activity = jsx:decode(Body, [return_maps]),
    
    %% Validazione dei campi obbligatori 
    case validate_activity(Activity) of
        false ->
            {ok, Resp} = cowboy_req:reply(400, #{}, <<"Invalid ActivityPub message">>, Req2),
            {ok, Resp, State};
        true ->
            To = maps:get(<<"to">>, Activity, []),
            %% Qui uso la funzione del nuovo modulo!
            case users_local_check:has_local_recipient(To) of
                true ->
                    {ok, Resp} = cowboy_req:reply(200, #{}, <<"Delivered to local user">>, Req2),
                    {ok, Resp, State};
                false ->
                    %% Salva nell'inbox globale
                    timeline_db:add_message(Activity),
                    {ok, Resp} = cowboy_req:reply(202, #{}, <<"Saved to global inbox">>, Req2),
                    {ok, Resp, State}
            end
    end.


%% vediamo di controllare se ci sono i campi obbligatori minimi di ActivityPub:

validate_activity(Activity) when is_map(Activity) ->
    maps:is_key(<<"type">>, Activity) andalso
    maps:is_key(<<"to">>, Activity) andalso
    maps:is_key(<<"actor">>, Activity) andalso
    maps:is_key(<<"object">>, Activity) andalso
    maps:is_key(<<"content">>, Activity).