command class

public class GlobalCommand implements CommandExecutor {

    private final LuckPerms luckPerms;
    private final HashMap<UUID, Long> cooldown;

    public GlobalCommand(LuckPerms luckPerms) {
        this.luckPerms = luckPerms;
        this.cooldown = new HashMap<>();
    }

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

        String serverPrefix = McCityChat.plugin.getConfig().getString("Server Prefix");
        String noPerm = McCityChat.plugin.getConfig().getString("No Permission");

        if (!(sender instanceof Player player)) {
            sender.sendMessage("Must be a player");
            return true;
        }
        if (!(args.length >= 1)) {
            sender.sendMessage("incorrect use msg");
            return true;
        }

        if (!sender.hasPermission("mccitychat.global")) {
            sender.sendMessage(MiniMessage.miniMessage().deserialize(serverPrefix + " " + noPerm));
            return true;
        }

        StringBuilder builder = new StringBuilder();
        for (String string : args) {
            builder.append(string).append(" ");
        }
        String msg = builder.toString().trim();

        User user = luckPerms.getPlayerAdapter(Player.class).getUser(player);
        String prefix = user.getCachedData().getMetaData().getPrefix();
        String suffix = user.getCachedData().getMetaData().getSuffix();
        String chatPrefix = McCityChat.plugin.getConfig().getString("Global Prefix");
        String color = McCityChat.plugin.getConfig().getString("Global Chat Color");
        String chatSep = McCityChat.plugin.getConfig().getString("Chat Separator");

        if (!sender.hasPermission("mccitychat.bypass")) {
            if (!cooldown.containsKey(player.getUniqueId())) {
                cooldown.put(player.getUniqueId(), System.currentTimeMillis());

                String message = chatPrefix + " " + prefix + sender.getName() + suffix + chatSep + color + msg;

                ByteArrayDataOutput out = ByteStreams.newDataOutput();
                out.writeUTF(GsonComponentSerializer.gson().serialize(MiniMessage.miniMessage().deserialize(message)));

                player.sendPluginMessage(McCityChat.plugin, "mccity:chat", out.toByteArray());

            }
            long timeElapsed = System.currentTimeMillis() - cooldown.get(player.getUniqueId());
            if (timeElapsed >= McCityChat.plugin.getConfig().getLong("Global Cooldown") * 1000) {
                String message = chatPrefix + " " + prefix + sender.getName() + suffix + chatSep + color + msg;

                ByteArrayDataOutput out = ByteStreams.newDataOutput();
                out.writeUTF(GsonComponentSerializer.gson().serialize(MiniMessage.miniMessage().deserialize(message)));

                player.sendPluginMessage(McCityChat.plugin, "mccity:chat", out.toByteArray());
                cooldown.put(player.getUniqueId(), System.currentTimeMillis());
                return true;
            } else {
                String cooldownMsgStr = McCityChat.plugin.getConfig().getString("Cooldown Message");
                if (cooldownMsgStr.contains("%c%")) {
                    Long timeRemaining = ((McCityChat.plugin.getConfig().getLong("Global Cooldown") * 1000) - timeElapsed) / 1000;
                    String timeRemainingStr = timeRemaining.toString();
                    String cooldownMsg = cooldownMsgStr.replaceAll("%c%", timeRemainingStr);
                    String cooldownMsgSend = serverPrefix + " " + cooldownMsg;

                    sender.sendMessage(MiniMessage.miniMessage().deserialize(cooldownMsgSend));
                    return true;
                }
                String cooldownMsgSend = serverPrefix + " " + cooldownMsgStr;

                ByteArrayDataOutput out = ByteStreams.newDataOutput();
                out.writeUTF(GsonComponentSerializer.gson().serialize(MiniMessage.miniMessage().deserialize(cooldownMsgSend)));

                player.sendPluginMessage(McCityChat.plugin, "mccity:chat", out.toByteArray());
                return true;
            }
        }
        String message = chatPrefix + " " + prefix + sender.getName() + suffix + chatSep + color + msg;

        ByteArrayDataOutput out = ByteStreams.newDataOutput();
        out.writeUTF(GsonComponentSerializer.gson().serialize(MiniMessage.miniMessage().deserialize(message)));

        player.sendPluginMessage(McCityChat.plugin, "mccity:chat", out.toByteArray());
        return true;
    }
}