% ==========================================================================================================
% 
% EvE ws
%
% Copyright (C) 2013, Jorge Garrido <zgbjgg@gmail.com>. 
% All rights reserved.
%
% BSD License
%
% Redistribution and use in source and binary forms, with or without modification, are permitted provided
% that the following conditions are met:
%
%  * Redistributions of source code must retain the above copyright notice, this list of conditions and the
%        following disclaimer.
%  * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
%        the following disclaimer in the documentation and/or other materials provided with the distribution.
%  * Neither the name of the authors nor the names of its contributors may be used to endorse or promote
%        products derived from this software without specific prior written permission.
%
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
% WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
% PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
% ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
% TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
% HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
% NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
% POSSIBILITY OF SUCH DAMAGE.
% ==========================================================================================================
-module(evews_socket).

-behaviour(gen_server).

%% API
-export([start_link/0, start_link/5]).

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

-define(SERVER, ?MODULE).

-include("evews.hrl").

-record(state, {port, handler, lsocket, ws_handler, mode}).

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

%%--------------------------------------------------------------------
%% @doc
%% Starts the server
%%
%% @spec start_link(Port, Handler, WsHandler) -> {ok, Pid} | ignore | 
%%						 {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link(LSocket, Port, Handler, WsHandler, SockOptions) ->
    State = #state{port=Port, handler=Handler, lsocket=LSocket, ws_handler=WsHandler, 
		   mode=case SockOptions of tcp -> tcp; _ -> ssl end},
    gen_server:start_link(?MODULE, [State, SockOptions], []).

%%--------------------------------------------------------------------
%% @doc
%% Starts the server
%%
%% @spec start_link() -> {ok, Pid} | ignore | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
    gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).

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

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Initiates the server
%%
%% @spec init(Args) -> {ok, State} |
%%                     {ok, State, Timeout} |
%%                     ignore |
%%                     {stop, Reason}
%% @end
%%--------------------------------------------------------------------
init([State = #state{port=_Port, lsocket=_LSocket, ws_handler=_WsHandler, mode=Mode}, _SockOptions]) ->
    Acceptor = case Mode of
	           tcp -> evews_acceptor;
		   ssl -> evews_acceptor_ssl
	       end,
    {ok, Acceptor:accept(State)}.	

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling call messages
%%
%% @spec handle_call(Request, From, State) ->
%%                                   {reply, Reply, State} |
%%                                   {reply, Reply, State, Timeout} |
%%                                   {noreply, State} |
%%                                   {noreply, State, Timeout} |
%%                                   {stop, Reason, Reply, State} |
%%                                   {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_call(_Request, _From, State) ->
    Reply = ok,
    {reply, Reply, State}.

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling cast messages
%%
%% @spec handle_cast(Msg, State) -> {noreply, State} |
%%                                  {noreply, State, Timeout} |
%%                                  {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_cast({accepted, _Pid}, State=#state{lsocket=_LSocket, ws_handler=_Ws, mode=Mode}) ->
    Acceptor = case Mode of
	         tcp -> evews_acceptor;
		 ssl -> evews_acceptor_ssl
             end,
    {noreply, Acceptor:accept(State)};
handle_cast(_Msg, State) ->
    {noreply, State}.

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling all non call/cast messages
%%
%% @spec handle_info(Info, State) -> {noreply, State} |
%%                                   {noreply, State, Timeout} |
%%                                   {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_info(_Info, 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, State) -> void()
%% @end
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
    ok.

%%--------------------------------------------------------------------
%% @private
%% @doc
%% Convert process state when code is changed
%%
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState}
%% @end
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
    {ok, State}.

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