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%%%-------------------------------------------------------------------
%%% File : yaws_stats.erl
%%% Author : Olivier Girondel <olivier@biniou.info>
%%% Description : Statistics module for Yaws
%%%
%%% Created : 11 Apr 2009 by Olivier Girondel <olivier@biniou.info>
%%%-------------------------------------------------------------------
-module(yaws_stats).

-behaviour(gen_server).

-include("yaws.hrl").

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

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

-export([hit/0, sent/1]).
-export([get/1]).

%% statistics
-record(stats, {
hits = 0,
sent = 0
}).

%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link() ->
    gen_server:start_link(?MODULE, [], []).


stop(Pid) ->
    gen_server:cast(Pid, {stop}).

    
hit() ->
    case get_stats() of
undefined ->
ok;
Pid ->
gen_server:cast(Pid, {hit})
    end.


sent(Bytes) ->
    case get_stats() of
undefined ->
ok;
Pid ->
gen_server:cast(Pid, {sent, Bytes})
    end.


get(Pid) ->
    case Pid of
undefined ->
undefined;
Pid ->
gen_server:call(Pid, {get})
    end.


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

%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([]) ->
    {ok, #stats{}}.

%%--------------------------------------------------------------------
%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% Description: Handling call messages
%%--------------------------------------------------------------------
handle_call({get}, _From, State) ->
    Reply = {State#stats.hits, State#stats.sent},
    {reply, Reply, State};


handle_call(_Request, _From, State) ->
    Reply = ok,
    {reply, Reply, State}.

%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast({hit}, Stats) ->
    NewHits = Stats#stats.hits+1,
    {noreply, Stats#stats{hits=NewHits}};


handle_cast({sent, Bytes}, Stats) ->
    NewSent = Stats#stats.sent+Bytes,
    {noreply, Stats#stats{sent=NewSent}};


handle_cast({stop}, Stats) ->
    {stop, normal, Stats};


handle_cast(_Msg, State) ->
    {noreply, State}.

%%--------------------------------------------------------------------
%% Function: handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling all non call/cast messages
%%--------------------------------------------------------------------
handle_info(_Info, State) ->
    {noreply, State}.

%%--------------------------------------------------------------------
%% Function: terminate(Reason, State) -> void()
%% Description: 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.
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
    ok.

%%--------------------------------------------------------------------
%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
%% Description: Convert process state when code is changed
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
    {ok, State}.

%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
get_stats() ->
    (erlang:get(sc))#sconf.stats.
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