%%% @doc Main Sheldon's supervisor.
%%%
%%% Copyright 2016 Inaka <hello@inaka.net>
%%%
%%% Licensed under the Apache License, Version 2.0 (the "License");
%%% you may not use this file except in compliance with the License.
%%% You may obtain a copy of the License at
%%%
%%%     http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing, software
%%% distributed under the License is distributed on an "AS IS" BASIS,
%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%% See the License for the specific language governing permissions and
%%% limitations under the License.
%%% @end
%%% @copyright Inaka <hello@inaka.net>
%%%
-module(sheldon_sup).
-author("Felipe Ripoll <ferigis@gmail.com>").
-behaviour(supervisor).

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

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

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

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

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

%% @doc here one child will be created per each dictionary
-spec init(any()) ->
  {ok, {supervisor:sup_flags(), [supervisor:child_spec()]}}.
init([]) ->
  SupFlags = #{ strategy  => one_for_one
              , intensity => 1000
              , period    => 3600
              },

  % Get all the languages, they are in /priv/lang/, each folder is a language
  {ok, SupportedLang} = file:list_dir(code:priv_dir(sheldon) ++ "/lang/"),

  Children = lists:map(fun get_child/1, SupportedLang),

  {ok, {SupFlags, Children}}.

%%%===================================================================
%%% Internal Functions
%%%===================================================================

-spec get_child(string()) -> supervisor:child_spec().
get_child(LangString) ->
  Lang = list_to_atom(LangString),
  Id = sheldon_dictionary:dictionary_name(Lang),
  #{ id       => Id
   , start    => {sheldon_dictionary, start_link, [Lang]}
   , restart  => permanent
   , shutdown => brutal_kill
   , type     => worker
   , modules  => [sheldon_dictionary]
   }.