%%%-------------------------------------------------------------------
%%% @author anlicheng
%%% @copyright (C) 2023, <COMPANY>
%%% @doc
%%%
%%% @end
%%% Created : 24. 12月 2023 15:42
%%%-------------------------------------------------------------------
-module(iot_api).
-author("anlicheng").

-behaviour(gen_server).

%% API
-export([start_link/0]).
-export([ai_event/1]).

%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).

-define(SERVER, ?MODULE).
-define(API_TOKEN, <<"wv6fGyBhl*7@AsD9">>).

-record(state, {

}).

%%%===================================================================
%%% API
%%%===================================================================

ai_event(Id) when is_integer(Id) ->
   gen_server:cast(?MODULE, {ai_event, Id}).

%% @doc Spawns the server and registers the local name (unique)
-spec(start_link() ->
    {ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
start_link() ->
    gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).

%%%===================================================================
%%% gen_server callbacks
%%%===================================================================

%% @private
%% @doc Initializes the server
-spec(init(Args :: term()) ->
    {ok, State :: #state{}} | {ok, State :: #state{}, timeout() | hibernate} |
    {stop, Reason :: term()} | ignore).
init([]) ->
    {ok, #state{}}.

%% @private
%% @doc Handling call messages
-spec(handle_call(Request :: term(), From :: {pid(), Tag :: term()},
    State :: #state{}) ->
    {reply, Reply :: term(), NewState :: #state{}} |
    {reply, Reply :: term(), NewState :: #state{}, timeout() | hibernate} |
    {noreply, NewState :: #state{}} |
    {noreply, NewState :: #state{}, timeout() | hibernate} |
    {stop, Reason :: term(), Reply :: term(), NewState :: #state{}} |
    {stop, Reason :: term(), NewState :: #state{}}).
handle_call(_Request, _From, State = #state{}) ->
    {reply, ok, State}.

%% @private
%% @doc Handling cast messages
-spec(handle_cast(Request :: term(), State :: #state{}) ->
    {noreply, NewState :: #state{}} |
    {noreply, NewState :: #state{}, timeout() | hibernate} |
    {stop, Reason :: term(), NewState :: #state{}}).
handle_cast({ai_event, Id}, State = #state{}) ->
    spawn_monitor(fun() ->
        Token = iot_util:md5(<<?API_TOKEN/binary, (integer_to_binary(Id))/binary, ?API_TOKEN/binary>>),
        {ok, Url} = application:get_env(iot, api_url),

        Headers = [
            {<<"content-type">>, <<"application/json">>}
        ],
        ReqData = #{
            <<"token">> => Token,
            <<"id">> => Id
        },
        Body = iolist_to_binary(jiffy:encode(ReqData, [force_utf8])),
        case hackney:request(post, Url, Headers, Body, [{pool, false}]) of
            {ok, 200, _, ClientRef} ->
                {ok, RespBody} = hackney:body(ClientRef),
                lager:debug("[iot_api] send body: ~p, get error is: ~p", [Body, RespBody]),
                hackney:close(ClientRef);
            {ok, HttpCode, _, ClientRef} ->
                {ok, RespBody} = hackney:body(ClientRef),
                hackney:close(ClientRef),
                lager:warning("[iot_api] send body: ~p, get error is: ~p", [Body, {HttpCode, RespBody}]);
            {error, Reason} ->
                lager:warning("[iot_api] send body: ~p, get error is: ~p", [Body, Reason])
        end
                  end),

    {noreply, State}.

%% @private
%% @doc Handling all non call/cast messages
-spec(handle_info(Info :: timeout() | term(), State :: #state{}) ->
    {noreply, NewState :: #state{}} |
    {noreply, NewState :: #state{}, timeout() | hibernate} |
    {stop, Reason :: term(), NewState :: #state{}}).
%% Task进程挂掉
handle_info({'DOWN', _MRef, process, _Pid, normal}, State) ->
    {noreply, State};

handle_info({'DOWN', _MRef, process, _Pid, Reason}, State) ->
    lager:notice("[iot_api] task process down with reason: ~p", [Reason]),
    {noreply, State};

handle_info(_Info, State = #state{}) ->
    {noreply, State}.

%% @private
%% @doc This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any
%% necessary cleaning up. When it returns, the gen_server terminates
%% with Reason. The return value is ignored.
-spec(terminate(Reason :: (normal | shutdown | {shutdown, term()} | term()),
    State :: #state{}) -> term()).
terminate(_Reason, _State = #state{}) ->
    ok.

%% @private
%% @doc Convert process state when code is changed
-spec(code_change(OldVsn :: term() | {down, term()}, State :: #state{},
    Extra :: term()) ->
    {ok, NewState :: #state{}} | {error, Reason :: term()}).
code_change(_OldVsn, State = #state{}, _Extra) ->
    {ok, State}.

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