%%%-------------------------------------------------------------------
%%% @author anlicheng
%%% @copyright (C) 2025, <COMPANY>
%%% @doc
%%%
%%% @end
%%% Created : 18. 4月 2025 16:42
%%%-------------------------------------------------------------------
-module(efka_server_sup).
-author("anlicheng").

-behaviour(supervisor).

%% API
-export([start_link/0]).
-export([register_server/1, delete_server/1]).

%% Supervisor callbacks
-export([init/1]).

-define(SERVER, ?MODULE).

%%%===================================================================
%%% API functions
%%%===================================================================

%% @doc Starts the supervisor
-spec(start_link() -> {ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
start_link() ->
    supervisor:start_link({local, ?SERVER}, ?MODULE, []).

%%%===================================================================
%%% Supervisor callbacks
%%%===================================================================

%% @private
%% @doc Whenever a supervisor is started using supervisor:start_link/[2,3],
%% this function is called by the new process to find out about
%% restart strategy, maximum restart frequency and child
%% specifications.
-spec(init(Args :: term()) ->
    {ok, {SupFlags :: {RestartStrategy :: supervisor:strategy(),
        MaxR :: non_neg_integer(), MaxT :: non_neg_integer()},
        [ChildSpec :: supervisor:child_spec()]}}
    | ignore | {error, Reason :: term()}).
init([]) ->
    SupFlags = #{strategy => one_for_one, intensity => 1000, period => 3600},

    {ok, {SupFlags, []}}.

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

-spec register_server(ServerId :: binary()) -> {ok, Pid :: pid()} | {error, Reason :: any()}.
register_server(ServerId) when is_binary(ServerId) ->
    case supervisor:start_child(?MODULE, child_spec(ServerId)) of
        {ok, Pid} when is_pid(Pid) ->
            {ok, Pid};
        {error, {'already_started', Pid}} when is_pid(Pid) ->
            {ok, Pid};
        {error, Error} ->
            {error, Error}
    end.

-spec delete_server(ServerId :: binary()) -> ok.
delete_server(ServerId) when is_binary(ServerId) ->
    ChildId = efka_server:get_name(ServerId),
    ok = supervisor:terminate_child(?MODULE, ChildId),
    supervisor:delete_child(?MODULE, ChildId).

child_spec(ServerId) when is_binary(ServerId) ->
    Name = efka_server:get_name(ServerId),
    #{
        id => Name,
        start => {efka_server, start_link, [Name, ServerId]},
        restart => permanent,
        shutdown => 2000,
        type => worker,
        modules => ['efka_server']
    }.