public class RankCommand implements CommandExecutor {

    //setrank <player> <rank>

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){

        Player player = (Player) sender;

        if(player.isOp()){

            if(args.length == 2){

                if (Bukkit.getOfflinePlayer(args[0]).hasPlayedBefore()){

                    if (EnumUtils.isValidEnum(Rank.class, args[1].toUpperCase())) {

                        Main.getFileManager().setRank(Bukkit.getOfflinePlayer(args[0]).getUniqueId(), Rank.valueOf(args[1].toUpperCase()));

                        player.sendMessage(ChatColor.GREEN + "You changed the rank!");

                        if(Bukkit.getOfflinePlayer(args[0]).isOnline()){

                            Bukkit.getOfflinePlayer(args[0]).getPlayer().sendMessage(player.getName() + " Just changed your rank to " + args[1]);

                        }

                    }else {
                        player.sendMessage(ChatColor.RED + "This rank doesn't exist!");
                    }

                } else {
                    player.sendMessage(ChatColor.RED + "Player not found! Did this player played before on this server?");
                }

            } else {
                player.sendMessage(ChatColor.RED + "Invalid usage! /setrank (player) [rank]");
            }

        } else {
            player.sendMessage(ChatColor.RED + "You do not have any permission to perform this command, you have to be OP!");
        }



        return false;
    }

}