%%%-------------------------------------------------------------------
%%% @author Heinz Nikolaus Gies <heinz@licenser.net>
%%% @copyright (C) 2012, Heinz Nikolaus Gies
%%% @doc
%%%
%%% @end
%%% Created :  9 Oct 2012 by Heinz Nikolaus Gies <heinz@licenser.net>
%%%-------------------------------------------------------------------
-module(libchunter_server).

-behaviour(gen_server).

%% API
-export([start_link/0, call/3, cast/3, call/4]).

%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
         terminate/2, code_change/3, console/4]).

-define(SERVER, ?MODULE).

-record(state, {}).

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

%%--------------------------------------------------------------------
%% @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
%% Initializes the server
%%
%% @spec init(Args) -> {ok, State} |
%%                     {ok, State, Timeout} |
%%                     ignore |
%%                     {stop, Reason}
%% @end
%%--------------------------------------------------------------------
init([]) ->
    {ok, #state{}}.

-spec call(Server::inet:ip_address() | inet:hostname(),
           Port::inet:port_number(),
           Command::fifo:chunter_message()) -> term().
call(Server, Port, Command) ->
    gen_server:call(?SERVER, {call, Server, Port, Command}).

call(Server, Port, Command, Timeout) ->
    gen_server:call(?SERVER, {call, Server, Port, Command, Timeout},
                    %% We add 1000 to make sure the call returns w/o
                    %% a gen_server timeout
                    Timeout + 1000).

-spec cast(Server::inet:ip_address() | inet:hostname(),
           Port::inet:port_number(),
           Command::fifo:chunter_message()) -> ok.

cast(Server, Port, Command) ->
    gen_server:cast(?SERVER, {cast, Server, Port, Command}).

console(Server, Port, VM, Proc) ->
    gen_server:call(?SERVER, {console, Server, Port, VM, Proc}).

%%--------------------------------------------------------------------
%% @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({call, Server, Port, Command, Timeout}, Form, State) ->
    libchunter_fsm:call(Server, Port, Command, Form, Timeout),
    {noreply, State};

handle_call({call, Server, Port, Command}, Form, State) ->
    libchunter_fsm:call(Server, Port, Command, Form),
    {noreply, State};

handle_call({console, Server, Port, VM, Proc}, _From, State) ->
    Cons = libchunter_console_server:console(Server, Port, VM, Proc),
    {reply, Cons, State};

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({cast, Server, Port, Command}, State) ->
    libchunter_fsm:cast(Server, Port, Command),
    {noreply, 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
%%%===================================================================