%%%-------------------------------------------------------------------
%%% @author anlicheng
%%% @copyright (C) 2025, <COMPANY>
%%% @doc
%%% 微服务守护进程
%%% 1. 负责微服务的下载, 版本的管理
%%% 2. 目录管理等
%%% @end
%%% Created : 19. 4月 2025 14:55
%%%-------------------------------------------------------------------
-module(efka_inetd).
-author("anlicheng").
-include("efka_tables.hrl").
-include("message_pb.hrl").

-behaviour(gen_server).

%% API
-export([start_link/0]).
-export([deploy/3]).

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

-define(SERVER, ?MODULE).

-record(state, {
    root_dir :: string(),
    %% 建立任务到ref之间的映射, #{TaskPid => {TaskId, ServiceId}}
    task_map = #{}
}).

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

-spec deploy(TaskId :: integer(), ServerId :: binary(), TarUrl :: binary()) -> ok | {error, Reason :: binary()}.
deploy(TaskId, ServerId, TarUrl) when is_integer(TaskId), is_binary(ServerId), is_binary(TarUrl) ->
    gen_server:call(?SERVER, {deploy, TaskId, ServerId, TarUrl}).

%% @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([]) ->
    erlang:process_flag(trap_exit, true),
    % Url = "http://118.178.229.213:3000/anlicheng/ekfa/archive1/main.tar.gz",

    {ok, RootDir} = application:get_env(efka, root_dir),
    {ok, #state{root_dir = RootDir}}.

%% @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({deploy, TaskId, ServiceId, TarUrl}, _From, State = #state{root_dir = RootDir, task_map = TaskMap}) ->
    {ok, TaskPid} = efka_inetd_task:start_link(TaskId, RootDir, ServiceId, TarUrl),
    efka_inetd_task:deploy(TaskPid),

    {reply, ok, State#state{task_map = maps:put(TaskPid, {TaskId, ServiceId}, TaskMap)}};

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(_Request, State = #state{}) ->
    {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{}}).
handle_info({'EXIT', TaskPid, Reason}, State = #state{task_map = TaskMap}) ->
    case maps:take(TaskPid, TaskMap) of
        error ->
            {noreply, State};
        {{TaskId, ServiceId}, NTaskMap} ->
            case Reason of
                normal ->
                    lager:debug("[efka_inetd] service_id: ~p, task_pid: ~p, exit normal", [ServiceId, TaskPid]),
                    efka_agent:feedback_phase(TaskId, efka_util:timestamp(), <<"task completed">>);
                Error ->
                    lager:debug("[efka_inetd] service_id: ~p, task_pid: ~p, exit with error: ~p", [ServiceId, TaskPid, Error]),
                    %% 下载完整
                    efka_agent:feedback_phase(TaskId, efka_util:timestamp(), <<"task aborted">>),
                    {noreply, State#state{task_map = NTaskMap}}
            end
    end;

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
%%%===================================================================