-module(client).
-export([start/1, loop/1, register/2, login/2]).

start(Node) ->
    process_flag(trap_exit, true),
    Client = server:start_on_node(Node, client, undef),
    link(Client),
    Server = spawn_link(client, loop, [Client]),

    case server:rpc(Client, {change_state, Server}) of
	{ok} ->
	    {ok, Client};
	Why ->
	    {error, {unknown_error, Why}}
    end.

execute(Client, F) ->
    %% execute F() with error handling
    %% (sends error message on exception)
    try F() of
	Result ->
	    Client ! {ok, Result}
    catch
	_: Why ->
	    Client ! {error, Why}
    end.

loop(Client) ->
    %% mainloop for client modul in server
    receive
	list ->
	    execute(Client, fun() -> media:all() end);

	get_votes ->
	    execute(Client, fun() -> media:getVotes(Client) end);

	{vote, Artist, Title} ->
	    execute(Client, fun() -> media:vote(Artist, Title) end);

	{devote, Artist, Title} ->
	    execute(Client, fun() -> media:devote(Artist, Title) end);

	Cmd ->
	    Client ! {error, {unknown_command, Cmd}}
    end,
    loop(Client).

register(Client, {Name, Password}) ->
    dis ! {Client, {register, {Name, Password}}}.

login(Client, {Node, Name, Password}) ->
    dis ! {Client, {login, {Node, Name, Password}}}.