修理最后一分钟不更新置顶的顺序问题，以及使用shutdown命令双重提示的问题

Reviewed-on: #1

.gitignore

@@ -2,3 +2,4 @@
 out/
 target/
 *.iml
+/dependency-reduced-pom.xml

README.md

@@ -1,6 +1,8 @@
 # VTools
 Tools for Velocity proxy server.
 
+add telegram/auto shutdown support for spec server.
+
 ## Commands
 |Command|What is does?|Permission|
 |-------|-------------|----------|

src/main/java/com/alpt/vtools/listeners/OnlinePlayerQueryService.java

@@ -0,0 +1,65 @@
+package com.alpt.vtools.listeners;
+
+import com.google.gson.Gson;
+import com.sun.net.httpserver.HttpServer;
+import com.velocitypowered.api.proxy.Player;
+import de.strifel.VTools.VTools;
+import org.jetbrains.annotations.TestOnly;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collection;
+
+public class OnlinePlayerQueryService {
+
+    public static OnlinePlayerQueryService INSTANCE;
+    private final VTools plugin;
+
+    private OnlinePlayerQueryService(VTools plugin) {
+        this.plugin = plugin;
+    }
+
+    private static final Gson gson = new Gson();
+
+    public static OnlinePlayerQueryService createInstance(VTools plugin) {
+        if (INSTANCE != null) return INSTANCE;
+        INSTANCE = new OnlinePlayerQueryService(plugin);
+        INSTANCE.register();
+        return INSTANCE;
+    }
+
+    private void register() {
+        int port = Integer.parseInt(plugin.getConfigOrDefault("http_service_port", "17611"));
+        try {
+            HttpServer server = HttpServer.create(new InetSocketAddress("127.0.0.1", port), 0);
+
+            server.createContext("/api/getOnlinePlayers", exchange -> {
+                Collection<Player> players = plugin.getServer().getAllPlayers();
+                ArrayList<String> playerNames = new ArrayList<>(players.size());
+                for (Player player : players) {
+                    playerNames.add(player.getUsername());
+                }
+                exchange.getResponseHeaders().set("Content-Type", "application/json");
+                exchange.sendResponseHeaders(200, 0);
+
+                try (OutputStream os = exchange.getResponseBody()) {
+                    String response = gson.toJson(playerNames);
+                    os.write(response.getBytes());
+                }
+            });
+
+            server.start();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @TestOnly
+    public static void main(String[] args) {
+        ArrayList<String> arrayList = new ArrayList<>();
+        arrayList.add("jerry");
+        System.out.println(gson.toJson(arrayList));
+    }
+}

src/main/java/com/alpt/vtools/listeners/ServerCloser.java

@@ -0,0 +1,210 @@
+package com.alpt.vtools.listeners;
+
+import com.velocitypowered.api.event.Subscribe;
+import com.velocitypowered.api.event.connection.DisconnectEvent;
+import com.velocitypowered.api.event.player.ServerConnectedEvent;
+import com.velocitypowered.api.proxy.ProxyServer;
+import de.strifel.VTools.VTools;
+import de.strifel.VTools.listeners.TGBridge;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.concurrent.LinkedBlockingQueue;
+
+public class ServerCloser {
+    private static final long MINUTE = 60L * 1000;
+
+    private final VTools plugin;
+    private final ProxyServer server;
+
+    private final LinkedBlockingQueue<Counter> lock = new LinkedBlockingQueue<>();
+
+    public static ServerCloser INSTANCE;
+
+    private ServerCloser(VTools plugin) {
+        this.plugin = plugin;
+        this.server = plugin.getServer();
+    }
+
+
+    private void close() {
+        if (!INSTANCE.server.getAllPlayers().isEmpty()) {
+            plugin.logger.error("ServerCloser: 定时器到点时发现服务器有人。这不应发生，因为定时器本应该被打断。");
+            TGBridge.error("ServerCloser: #bug @NaAlOH4 定时器到点时发现服务器有人。这不应发生，因为定时器本应该被打断。");
+            return;
+        }
+        String apiUrl = plugin.getConfigOrDefault("azure_api_url", "https://example.com/");
+        try {
+            Runtime.getRuntime().exec(new String[]{"systemd-run", "--description=pymcd_stop", "--quiet", "--user", "--collect", "-p", "StandardInput=data", "-p", "StandardInputData=c2V0IC1lCnA9IiQocGdyZXAgLWYgcHltY2QucHkgLUFvKSIKa2lsbCAtSU5UICIkcCIKdGFpbCAtLXBpZD0iJHAiIC1mIC9kZXYvbnVsbApjdXJsIC1zIC1IICJDb250ZW50LVR5cGU6IGFwcGxpY2F0aW9uL2pzb24iIC1kICJ7XCJhY3Rpb25cIjpcInN0b3BcIn0iICIkMSIK", "bash", "-s", apiUrl});
+        } catch (IOException ignored) {}
+    }
+
+    private boolean firstInit;
+
+    public static ServerCloser createInstance(VTools plugin) {
+        if (INSTANCE != null) return INSTANCE;
+        INSTANCE = new ServerCloser(plugin);
+        INSTANCE.server.getEventManager().register(plugin, INSTANCE);
+        INSTANCE.firstInit = true;
+        INSTANCE.update();
+        return INSTANCE;
+    }
+
+
+    @SuppressWarnings("java:S106")
+    @Subscribe
+    public void onDisconnect(DisconnectEvent event) {
+        update();
+    }
+
+    @Subscribe
+    public void onServerConnected(ServerConnectedEvent event) {
+        update();
+    }
+
+    private void update() {
+        if (server.getAllPlayers().isEmpty()) {
+            initCountdown();
+            return;
+        }
+        boolean canceledSomething = false;
+        synchronized (lock) {
+            while (!lock.isEmpty()) {
+                lock.poll().cancel();
+                canceledSomething = true;
+            }
+        }
+        if (canceledSomething) {
+            plugin.logger.info("ServerCloser: 有玩家在线，干掉任何可能的关机计时器。");
+        }
+
+        TGBridge.setShuttingDown(-1);
+    }
+
+    private void initCountdown() {
+        startCountdown(firstInit);
+        firstInit = false;
+    }
+
+    private void startCountdown(boolean isFirstInit) {
+        synchronized (lock) {
+            while (!lock.isEmpty()) {
+                lock.poll().cancel();
+            }
+            lock.add(new Counter(INSTANCE, isFirstInit ? 60 : 15).start());
+        }
+    }
+
+
+    public void fastShutdown() {
+        synchronized (lock) {
+            while (!lock.isEmpty()) {
+                lock.poll().cancel();
+            }
+            lock.add(new Counter(INSTANCE, 1).reason("收到关机命令已经过了 %s 分钟，即将关机。").noLastWarning().start());
+        }
+    }
+
+    public void slowShutdown() {
+        synchronized (lock) {
+            while (!lock.isEmpty()) {
+                lock.poll().cancel();
+            }
+            lock.add(new Counter(INSTANCE, 60).reason("虽然关机被取消，但 %s 分钟内依旧没有玩家上线，即将关机。").start());
+        }
+    }
+
+    public void noShutdown() {
+        synchronized (lock) {
+            while (!lock.isEmpty()) {
+                lock.poll().cancel();
+            }
+        }
+    }
+
+    private static class Counter {
+        private final ServerCloser instance;
+        private final int totalMin;
+        private int minLeft;
+        private boolean canceled = false;
+        private String reason;
+        private static final String DEFAULT_REASON = "距离上一个玩家离开已经过了 %s 分钟，即将关机。";
+        private boolean lastWarning = true;
+
+        protected Counter(ServerCloser instance, int minute) {
+            this.instance = instance;
+            totalMin = minute;
+            minLeft = minute;
+            this.reason = DEFAULT_REASON;
+        }
+
+        public Counter reason(String reason) {
+            this.reason = reason;
+            return this;
+        }
+
+        public Counter noLastWarning() {
+            lastWarning = false;
+            return this;
+        }
+
+        protected synchronized void cancel() {
+            canceled = true;
+            this.notifyAll();
+        }
+
+        private boolean started = false;
+        private final Object startLock = new Object();
+
+        protected Counter start() {
+            synchronized (startLock) {
+                if (started) return this;
+                started = true;
+            }
+            new Thread(this::run).start();
+            return this;
+        }
+
+        private synchronized void run() {
+            while (true) {
+                if (canceled) return;
+                TGBridge.setShuttingDown(minLeft);
+                switch (minLeft) {
+                    case 1 -> {
+                        String msg = "服务器即将在一分钟后关机，使用 /fuck 以取消。";
+                        instance.plugin.logger.info(msg);
+                        if (lastWarning) {
+                            TGBridge.log(msg);
+                        }
+                    }
+                    case 0 -> {
+                        String msg = "ServerCloser: " + reason.formatted(totalMin);
+                        instance.plugin.logger.info(msg);
+                        TGBridge.log(msg);
+                        instance.close();
+                        canceled = true;
+                    }
+                    case -1 -> {
+                        instance.plugin.logger.error("ServerCloser: 定时器写炸了。");
+                        TGBridge.error("ServerCloser: #bug @NaAlOH4 定时器写炸了。");
+                        canceled = true;
+                    }
+                    default -> instance.plugin.logger.info("服务器即将在 {} 分钟后关机", minLeft);
+                }
+
+                try {
+                    this.wait(MINUTE);
+                } catch (InterruptedException ignored) {}
+                if (canceled) return;
+                if (!instance.server.getAllPlayers().isEmpty()) {
+                    instance.plugin.logger.error("ServerCloser: 定时器发现服务器有人。这不应发生，因为定时器本应该被直接打断。");
+                    TGBridge.error("ServerCloser: #bug @NaAlOH4 定时器发现服务器有人。这不应发生，因为定时器本应该被直接打断。");
+                    canceled = true;
+                }
+                if (canceled) return;
+
+                minLeft--;
+            }
+        }
+    }
+}

src/main/java/com/alpt/vtools/utils/MarkdownString.java

@@ -0,0 +1,241 @@
+package com.alpt.vtools.utils;
+
+import com.pengrad.telegrambot.model.Message;
+import com.pengrad.telegrambot.model.MessageEntity;
+
+import java.util.*;
+import java.util.function.BiFunction;
+
+public class MarkdownString {
+
+    private MarkdownString() {
+        throw new IllegalStateException();
+    }
+
+    /**
+     * 这里的 format 假设 BiFunction 的输入都是转义过的。
+     */
+    private static final Map<MessageEntity.Type, BiFunction<StringBuilder, MessageEntity, StringBuilder>> formats;
+
+    static {
+        Map<MessageEntity.Type, BiFunction<StringBuilder, MessageEntity, StringBuilder>> map = new EnumMap<>(MessageEntity.Type.class);
+
+        map.put(MessageEntity.Type.bold, (s, e) -> {
+            assert e.type() == MessageEntity.Type.bold;
+            return s.insert(0, "*").append("*");
+        });
+        map.put(MessageEntity.Type.strikethrough, (s, e) -> {
+            assert e.type() == MessageEntity.Type.strikethrough;
+            return s.insert(0, "~").append("~");
+        });
+        map.put(MessageEntity.Type.spoiler, (s, e) -> {
+            assert e.type() == MessageEntity.Type.spoiler;
+            return s.insert(0, "||").append("||");
+        });
+
+
+        map.put(MessageEntity.Type.italic, (s, e) -> {
+            assert e.type() == MessageEntity.Type.italic;
+            return s.insert(0, "\r_\r").append("\r_\r"); // todo: 精简一下 到底哪里需要加\r
+        });
+        map.put(MessageEntity.Type.underline, (s, e) -> {
+            assert e.type() == MessageEntity.Type.underline;
+            return s.insert(0, "\r__\r").append("\r__\r");
+        });
+
+        // https://core.telegram.org/bots/api#formatting-options
+        // 上面这几个套娃友好，自身随意套娃，但不能和等宽组合
+
+
+        map.put(MessageEntity.Type.code, (s, e) -> {
+            assert e.type() == MessageEntity.Type.code;
+            return s.insert(0, "`").append("`");
+        });
+        map.put(MessageEntity.Type.pre, (rawStr, messageEntity) -> {
+            assert messageEntity.type() == MessageEntity.Type.pre;
+            rawStr.insert(0, "\n");
+            String language = messageEntity.language();
+            if (language != null && language.length() > 0) {
+                rawStr.insert(0, language);
+            }
+            return rawStr.insert(0, "```").append("\n```");
+        });
+
+        // 等宽（pre 和 code）完全禁止套娃
+
+        map.put(MessageEntity.Type.text_link, (s, e) -> {
+            assert e.type() == MessageEntity.Type.text_link;
+            return s.insert(0, "[").append("](").append(escapeStr(e.url())).append(")");
+        });
+        map.put(MessageEntity.Type.text_mention, (s, e) -> {
+            assert e.type() == MessageEntity.Type.text_mention;
+            if (e.user() == null || e.user().id() == null) {
+                return s; // 没有id时爆炸（
+            }
+            return s.insert(0, "[").append("](").append("tg://user?id=").append(e.user().id()).append(")");
+        });
+
+        // 链接类不能和链接类套娃，但是可以和加粗等套娃友好的组合
+
+        formats = Collections.unmodifiableMap(map);
+    }
+
+
+    private static class StringBlock {
+        @Override
+        public String toString() {
+            return "StringBlock{" +
+                    "text='" + text + '\'' +
+                    ", entities=" + entities +
+                    ", offset=" + offset +
+                    '}';
+        }
+
+        private final String text;
+        private Map<MessageEntity.Type, MessageEntity> entities;
+        private final int offset;
+
+        StringBlock(String text, int offset) {
+            this.text = text;
+            this.offset = offset;
+            this.entities = new EnumMap<>(MessageEntity.Type.class);
+        }
+
+        private String getMarkdownTextWithoutLink() { // todo: 压缩 *text1**_text2_* 为 *text1_text2_*
+            // 链接类不能和链接类套娃
+            assert (!entities.containsKey(MessageEntity.Type.text_link)) || (!entities.containsKey(MessageEntity.Type.text_mention));
+            // 等宽（pre 和 code）完全禁止套娃
+            assert (!entities.containsKey(MessageEntity.Type.pre) && !entities.containsKey(MessageEntity.Type.code)) || (entities.size() <= 1);
+
+            StringBuilder s = new StringBuilder(escapeStr(text));
+            for (var entry : entities.entrySet()) {
+                BiFunction<StringBuilder, MessageEntity, StringBuilder> repeater = (sb, e) -> sb;
+                s = formats.getOrDefault(entry.getKey(), repeater).apply(s, entry.getValue()); // 无用赋值...理论上。
+            }
+            return s.toString();
+        }
+    }
+
+    public static String markdownString(Message message) {
+        if (message.entities() == null || message.entities().length == 0) return message.text();
+
+        List<StringBlock> stringBlocks = createStringBlocks(message);
+
+
+        StringBuilder s = new StringBuilder();
+        for (int i = 0; i < stringBlocks.size(); i++) {
+
+
+            var stringBlock = stringBlocks.get(i);
+            var entities = stringBlock.entities;
+            String withoutLink = stringBlock.getMarkdownTextWithoutLink();
+            if (entities.containsKey(MessageEntity.Type.text_mention) ||
+                    entities.containsKey(MessageEntity.Type.text_link)) {
+                assert (!entities.containsKey(MessageEntity.Type.text_mention) ||
+                        !entities.containsKey(MessageEntity.Type.text_link));
+                StringBuilder linkText = new StringBuilder();
+                MessageEntity entity = entities.containsKey(MessageEntity.Type.text_mention) ?
+                        stringBlock.entities.get(MessageEntity.Type.text_mention) :
+                        stringBlock.entities.get(MessageEntity.Type.text_link);
+                assert entity.offset() == stringBlock.offset;
+                int end = entity.length() + entity.offset();
+
+                while (true) {
+                    linkText.append(stringBlock.getMarkdownTextWithoutLink());
+                    if (stringBlock.text.length() + stringBlock.offset == end) {
+                        break;
+                    }
+                    if (stringBlock.text.length() + stringBlock.offset > end) {
+                        throw new IllegalStateException("奶冰可爱捏");
+                    }
+                    i++;
+                    stringBlock = stringBlocks.get(i);
+                }
+
+                s.append(formats.get(entity.type()).apply(linkText, entity));
+            } else {
+                s.append(withoutLink);
+            }
+        }
+
+        return s.toString();
+    }
+
+    /**
+     * @return 一组 StringBlock，被完全切开的文本，每部分都和相邻部分格式不一样，顺序的。
+     */
+    private static List<StringBlock> createStringBlocks(Message message) {
+        List<StringBlock> stringBlocks = new ArrayList<>();
+        Set<Integer> splitPoints = new HashSet<>();
+
+        // 定位切割点
+        for (MessageEntity entity : message.entities()) {
+            if (formats.containsKey(entity.type())) {
+                Integer offset = entity.offset();
+                Integer length = entity.length();
+                splitPoints.add(offset);
+                splitPoints.add(offset + length);
+            }
+        }
+
+        // 切割文本
+        String text = message.text();
+        List<Integer> sortedSplitPoints = new ArrayList<>(splitPoints);
+        Collections.sort(sortedSplitPoints);
+
+        int start = 0;
+        for (int splitPoint : sortedSplitPoints) {
+            if (splitPoint == 0) continue;// 跳过第一个空的
+            stringBlocks.add(new StringBlock(text.substring(start, splitPoint), start));
+            start = splitPoint;
+        }
+        if (start < text.length()) {
+            stringBlocks.add(new StringBlock(text.substring(start), start));
+        }
+
+        // 给文本重新赋格式（MessageEntity）
+        for (MessageEntity entity : message.entities()) {
+            if (!formats.containsKey(entity.type())) {
+                continue;
+            }
+            for (StringBlock stringBlock : stringBlocks) {
+                int blockStart = stringBlock.offset;
+                int blockEnd = blockStart + stringBlock.text.length();
+
+                int entityStart = entity.offset();
+                int entityEnd = entityStart + entity.length();
+
+                assert (blockStart < blockEnd) && (entityStart < entityEnd);
+                if (blockStart >= entityEnd || blockEnd <= entityStart) {
+                    continue;
+                }
+                assert (blockStart >= entityStart) && (blockEnd <= entityEnd) : String.format("%s,%s,%s,%s", blockStart, blockEnd, entityStart, entityEnd);
+                MessageEntity old = stringBlock.entities.put(entity.type(), entity);
+                assert (old == null);
+            }
+        }
+        return stringBlocks;
+    }
+
+    private static final boolean[] SHOULD_ESCAPE = new boolean[128];
+
+    static {
+        // In all other places characters '_', '*', '[', ']', '(', ')', '~', '`', '>', '#', '+', '-', '=', '|', '{', '}', '.', '!' must be escaped with the preceding character '\'.
+        char[] chars = {'_', '*', '[', ']', '(', ')', '~', '`', '>', '#', '+', '-', '=', '|', '{', '}', '.', '!'};
+        for (char c : chars) {
+            SHOULD_ESCAPE[c] = true;
+        }
+    }
+
+    public static String escapeStr(String s) {
+        StringBuilder r = new StringBuilder();
+        for (String character : s.split("")) {
+            int codePoint = character.codePointAt(0);
+            if (codePoint < 128 && SHOULD_ESCAPE[codePoint]) {
+                r.append('\\');
+            }
+            r.append(character);
+        }
+        return r.toString();
+    }
+}

src/main/java/de/strifel/VTools/VTools.java

@@ -1,5 +1,7 @@
 package de.strifel.VTools;
 
+import com.alpt.vtools.listeners.OnlinePlayerQueryService;
+import com.alpt.vtools.listeners.ServerCloser;
 import com.velocitypowered.api.event.Subscribe;
 import com.velocitypowered.api.event.proxy.ProxyInitializeEvent;
 import com.velocitypowered.api.plugin.Plugin;
@@ -9,11 +11,17 @@ import de.strifel.VTools.commands.*;
 import de.strifel.VTools.listeners.*;
 import net.kyori.adventure.text.format.TextColor;
 import org.slf4j.Logger;
+import org.yaml.snakeyaml.Yaml;
 
 import javax.inject.Inject;
+import java.io.File;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.Map;
 
-@Plugin(id = "vtools", name="VTools", version="1.0-SNAPSHOT", description="Some commands!", authors="unnamed")
+@Plugin(id = "vtools", name = "VTools", version = "1.0-SNAPSHOT", description = "Some commands!", authors = "unnamed")
 public class VTools {
     private final ProxyServer server;
     public final Logger logger;
@@ -40,10 +48,48 @@ public class VTools {
         server.getCommandManager().register("staffchat", new CommandStaffChat(server), "sc");
         server.getCommandManager().register("restart", new CommandRestart(server));
         server.getCommandManager().register("tps", new CommandTp(server), "jump");
+        server.getCommandManager().register("server", new CommandServer(server), "serverv");
         server.getCommandManager().register("servers", new CommandServers(server), "allservers");
+        loadConfig();
         new TGBridge(this).register();
         new PlayerStatus(this).register();
         new GlobalChat(this).register();
+        ServerCloser.createInstance(this);
+        OnlinePlayerQueryService.createInstance(this);
+    }
+
+    private Map<String, String> config = new HashMap<>();
+
+    public String getConfig(String k) {
+        return config.get(k);
+    }
+
+    public String getConfigOrDefault(String k, String v) {
+        return config.getOrDefault(k, v);
+    }
+
+    private void loadConfig() {
+        try {
+            File configDir = dataDirectory.toFile();
+            if (!configDir.exists()) {
+                configDir.mkdir();
+            }
+            File configFile = new File(configDir, "config.yaml");
+            if (!configFile.exists()) {
+                String defVal = """
+                        chat_id: "0"
+                        token: ""
+                        azure_api_url: "https://example.com/"
+                        http_service_port: 17611
+                        """;
+                Files.write(Path.of(configFile.toURI()), defVal.getBytes(StandardCharsets.UTF_8));
+            }
+            String configStr = Files.readString(Path.of(configFile.toURI()), StandardCharsets.UTF_8);
+            Yaml yaml = new Yaml();
+            config = yaml.load(configStr);
+        } catch (Exception e) {
+            logger.error("parsing config", e);
+        }
     }
 
     public ProxyServer getServer() {

src/main/java/de/strifel/VTools/commands/CommandFind.java

@@ -5,6 +5,8 @@ import com.velocitypowered.api.command.SimpleCommand;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.ProxyServer;
 import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.event.ClickEvent;
+import net.kyori.adventure.text.format.NamedTextColor;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -29,7 +31,12 @@ public class CommandFind implements SimpleCommand {
         if (strings.length == 1) {
             Optional<Player> player = server.getPlayer(strings[0]);
             if (player.isPresent() && player.get().getCurrentServer().isPresent()) {
-                commandSource.sendMessage(Component.text("Player " + strings[0] + " is on " + player.get().getCurrentServer().get().getServerInfo().getName() + "!").color(COLOR_YELLOW));
+                String serverName = player.get().getCurrentServer().get().getServerInfo().getName();
+                commandSource.sendMessage(Component.empty()
+                        .append(Component.text("Player " + strings[0] + " is on ").color(COLOR_YELLOW))
+                        .append(Component.text(serverName).clickEvent(ClickEvent.runCommand("/server " + serverName)).color(NamedTextColor.GRAY))
+                        .append(Component.text("!").color(COLOR_YELLOW))
+                );
             } else {
                 commandSource.sendMessage(Component.text("The player is not online!").color(COLOR_YELLOW));
             }

src/main/java/de/strifel/VTools/commands/CommandGlobalChat.java

@@ -54,7 +54,7 @@ public class CommandGlobalChat implements SimpleCommand {
 
     @Override
     public List<String> suggest(Invocation invocation) {
-        return new ArrayList<String>();
+        return new ArrayList<>();
     }
 
     @Override

src/main/java/de/strifel/VTools/commands/CommandRestart.java

@@ -1,6 +1,5 @@
 package de.strifel.VTools.commands;
 
-import com.velocitypowered.api.command.CommandSource;
 import com.velocitypowered.api.command.SimpleCommand;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.ProxyServer;
@@ -19,7 +18,6 @@ public class CommandRestart implements SimpleCommand {
 
     @Override
     public void execute(SimpleCommand.Invocation invocation) {
-        CommandSource commandSource = invocation.source();
         String[] strings = invocation.arguments();
 
         if (strings.length > 0) {
@@ -33,7 +31,7 @@ public class CommandRestart implements SimpleCommand {
 
     @Override
     public List<String> suggest(SimpleCommand.Invocation invocation) {
-        return new ArrayList<String>();
+        return new ArrayList<>();
     }
 
     @Override

src/main/java/de/strifel/VTools/commands/CommandSend.java

@@ -9,10 +9,7 @@ import com.velocitypowered.api.proxy.ServerConnection;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import net.kyori.adventure.text.Component;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Optional;
+import java.util.*;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
 import java.util.stream.Collectors;
@@ -39,23 +36,20 @@ public class CommandSend implements SimpleCommand {
                 for (Player player : server.getAllPlayers()) {
                     oPlayer.add(player);
                 }
-            }
-            else if (strings[0].equals("current")) {
+            } else if (strings[0].equals("current")) {
                 if (commandSource instanceof Player) {
-                    Player playerSource = (Player)commandSource;
+                    Player playerSource = (Player) commandSource;
                     Optional<ServerConnection> conn = playerSource.getCurrentServer();
                     if (conn.isPresent()) {
                         for (Player player : conn.get().getServer().getPlayersConnected()) {
                             oPlayer.add(player);
                         }
                     }
-                }
-                else {
+                } else {
                     commandSource.sendMessage(Component.text("Command is only for players.").color(COLOR_RED));
                     return;
                 }
-            }
-            else {
+            } else {
                 Optional<Player> p = server.getPlayer(strings[0]);
                 if (p.isPresent()) {
                     oPlayer.add(p.get());
@@ -94,9 +88,9 @@ public class CommandSend implements SimpleCommand {
                         }
                     }));
                     String sendResults = results.isEmpty() ? "nothing" : results.entrySet().stream().map(
-                        entry -> String.format("%s : %d", entry.getKey(), entry.getValue())
+                            entry -> String.format("%s : %d", entry.getKey(), entry.getValue())
                     ).collect(Collectors.joining("\n"));
-                    commandSource.sendMessage(Component.text(String.format("Send Results:\n%s", sendResults)).color(COLOR_YELLOW));
+                    commandSource.sendMessage(Component.text("Send Results:%n%s".formatted(sendResults)).color(COLOR_YELLOW));
                 }).start();
             } else {
                 commandSource.sendMessage(Component.text("The server or user does not exist!").color(COLOR_RED));
@@ -108,21 +102,26 @@ public class CommandSend implements SimpleCommand {
 
     public List<String> suggest(SimpleCommand.Invocation invocation) {
         String[] currentArgs = invocation.arguments();
-
-        List<String> arg = new ArrayList<String>();
-        if (currentArgs.length <= 1) {
-            arg.add("all");
-            arg.add("current");
-            for (Player player : server.getAllPlayers()) {
-                arg.add(player.getUsername());
+        switch (currentArgs.length) {
+            case 0, 1 -> {
+                List<String> args = new ArrayList<>(server.getPlayerCount() + 2);
+                args.add("all");
+                args.add("current");
+                for (Player player : server.getAllPlayers()) {
+                    args.add(player.getUsername());
+                }
+                return currentArgs.length==0?args:
+                        args.stream().filter(arg->arg.regionMatches(true,0,currentArgs[0],0,currentArgs[0].length())).toList();
             }
-            return arg;
-        } else if (currentArgs.length == 2) {
-            for (RegisteredServer server : server.getAllServers()) {
-                arg.add(server.getServerInfo().getName());
+            case 2 -> {
+                return server.getAllServers().stream().map(s -> s.getServerInfo().getName())
+                        .filter(name -> name.regionMatches(true, 0, currentArgs[1], 0, currentArgs[1].length()))
+                        .toList();
+            }
+            default -> {
+                return new ArrayList<>(0);
             }
         }
-        return arg;
     }
 
     public boolean hasPermission(SimpleCommand.Invocation invocation) {

src/main/java/de/strifel/VTools/commands/CommandServer.java

@@ -0,0 +1,41 @@
+package de.strifel.VTools.commands;
+
+import com.velocitypowered.api.command.SimpleCommand;
+import com.velocitypowered.api.proxy.Player;
+import com.velocitypowered.api.proxy.ProxyServer;
+import de.strifel.VTools.commands.utils.ServerUtil;
+import net.kyori.adventure.text.Component;
+
+import static de.strifel.VTools.VTools.COLOR_RED;
+
+public class CommandServer extends ServerUtil implements SimpleCommand {
+
+    private final ProxyServer server;
+
+    public CommandServer(ProxyServer server) {
+        super(server);
+        this.server = server;
+    }
+
+    @Override
+    public void execute(final SimpleCommand.Invocation invocation) {
+        if (invocation.source() instanceof Player) {
+            if (
+                    invocation.source().hasPermission("velocity.command.server") ||
+                    server.getAllPlayers().stream().anyMatch(p -> p.hasPermission("vtools.send") && p.hasPermission("vtools.send.recvmsg"))) {
+                super.execute(invocation);
+            }
+            else {
+                invocation.source().sendMessage(Component.text("Supervisor offline.").color(COLOR_RED));
+            }
+        }
+        else {
+            invocation.source().sendMessage(Component.text("Command is only for players.").color(COLOR_RED));
+        }
+    }
+
+    @Override
+    public boolean hasPermission(Invocation commandInvocation) {
+        return commandInvocation.source().hasPermission("vtools.server.auto");
+    }
+}

src/main/java/de/strifel/VTools/commands/CommandServers.java

@@ -34,7 +34,7 @@ public class CommandServers implements SimpleCommand {
 
     @Override
     public List<String> suggest(SimpleCommand.Invocation invocation) {
-        return new ArrayList<String>();
+        return new ArrayList<>();
     }
 
     @Override

src/main/java/de/strifel/VTools/commands/CommandTp.java

@@ -26,11 +26,11 @@ public class CommandTp implements SimpleCommand {
         CommandSource commandSource = commandInvocation.source();
         String[] strings = commandInvocation.arguments();
 
-        if (commandSource instanceof Player) {
+        if (commandSource instanceof Player playerCommandSource) {
             if (strings.length == 1) {
                 Optional<Player> player = server.getPlayer(strings[0]);
                 if (player.isPresent()) {
-                    player.get().getCurrentServer().ifPresent(serverConnection -> ((Player) commandSource).createConnectionRequest(serverConnection.getServer()).fireAndForget());
+                    player.get().getCurrentServer().ifPresent(serverConnection -> playerCommandSource.createConnectionRequest(serverConnection.getServer()).fireAndForget());
                     commandSource.sendMessage(Component.text("Connecting to the server of " + strings[0]).color(COLOR_YELLOW));
                 } else {
                     commandSource.sendMessage(Component.text("Player does not exists.").color(COLOR_RED));
@@ -56,6 +56,6 @@ public class CommandTp implements SimpleCommand {
 
     @Override
     public boolean hasPermission(Invocation commandInvocation) {
-        return commandInvocation.source().hasPermission("VTools.tps");
+        return commandInvocation.source().hasPermission("VTools.tps") || commandInvocation.source().hasPermission("vtools.server.auto");
     }
 }

src/main/java/de/strifel/VTools/commands/utils/ServerUtil.java

@@ -0,0 +1,176 @@
+package de.strifel.VTools.commands.utils;
+
+import static net.kyori.adventure.text.event.HoverEvent.showText;
+
+import com.google.common.collect.ImmutableList;
+import com.velocitypowered.api.command.CommandSource;
+import com.velocitypowered.api.command.SimpleCommand;
+import com.velocitypowered.api.permission.Tristate;
+import com.velocitypowered.api.proxy.Player;
+import com.velocitypowered.api.proxy.ProxyServer;
+import com.velocitypowered.api.proxy.ServerConnection;
+import com.velocitypowered.api.proxy.server.RegisteredServer;
+import com.velocitypowered.api.proxy.server.ServerInfo;
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.TextComponent;
+import net.kyori.adventure.text.TranslatableComponent;
+import net.kyori.adventure.text.event.ClickEvent;
+import net.kyori.adventure.text.format.NamedTextColor;
+
+// https://github.com/PaperMC/Velocity/blob/40b76c633276fcd6aea165baeae74039b2d059c4/proxy/src/main/java/com/velocitypowered/proxy/command/builtin/ServerCommand.java
+
+/**
+ * Implements Velocity's {@code /server} command.
+ */
+public abstract class ServerUtil implements SimpleCommand {
+
+    public static final int MAX_SERVERS_TO_LIST = 50;
+    private final ProxyServer server;
+
+    public ServerUtil(ProxyServer server) {
+        this.server = server;
+    }
+
+    @Override
+    public void execute(final SimpleCommand.Invocation invocation) {
+        final CommandSource source = invocation.source();
+        final String[] args = invocation.arguments();
+
+        if (!(source instanceof Player)) {
+            source.sendMessage(CommandMessages.PLAYERS_ONLY);
+            return;
+        }
+
+        Player player = (Player) source;
+        if (args.length == 1) {
+            // Trying to connect to a server.
+            String serverName = args[0];
+            Optional<RegisteredServer> toConnect = server.getServer(serverName);
+            if (toConnect.isEmpty()) {
+                player.sendMessage(CommandMessages.SERVER_DOES_NOT_EXIST.args(Component.text(serverName)));
+                return;
+            }
+
+            player.createConnectionRequest(toConnect.get()).fireAndForget();
+        } else {
+            outputServerInformation(player);
+        }
+    }
+
+    private void outputServerInformation(Player executor) {
+        String currentServer = executor.getCurrentServer().map(ServerConnection::getServerInfo)
+                .map(ServerInfo::getName).orElse("<unknown>");
+        executor.sendMessage(Component.translatable(
+                "velocity.command.server-current-server",
+                NamedTextColor.YELLOW,
+                Component.text(currentServer)));
+
+        List<RegisteredServer> servers = BuiltinCommandUtil.sortedServerList(server);
+        if (servers.size() > MAX_SERVERS_TO_LIST) {
+            executor.sendMessage(Component.translatable(
+                    "velocity.command.server-too-many", NamedTextColor.RED));
+            return;
+        }
+
+        // Assemble the list of servers as components
+        TextComponent.Builder serverListBuilder = Component.text()
+                .append(Component.translatable("velocity.command.server-available",
+                        NamedTextColor.YELLOW))
+                .append(Component.space());
+        for (int i = 0; i < servers.size(); i++) {
+            RegisteredServer rs = servers.get(i);
+            serverListBuilder.append(formatServerComponent(currentServer, rs));
+            if (i != servers.size() - 1) {
+                serverListBuilder.append(Component.text(", ", NamedTextColor.GRAY));
+            }
+        }
+
+        executor.sendMessage(serverListBuilder.build());
+    }
+
+    private TextComponent formatServerComponent(String currentPlayerServer, RegisteredServer server) {
+        ServerInfo serverInfo = server.getServerInfo();
+        TextComponent serverTextComponent = Component.text(serverInfo.getName());
+
+        int connectedPlayers = server.getPlayersConnected().size();
+        TranslatableComponent playersTextComponent;
+        if (connectedPlayers == 1) {
+            playersTextComponent = Component.translatable(
+                    "velocity.command.server-tooltip-player-online");
+        } else {
+            playersTextComponent = Component.translatable(
+                    "velocity.command.server-tooltip-players-online");
+        }
+        playersTextComponent = playersTextComponent.args(Component.text(connectedPlayers));
+        if (serverInfo.getName().equals(currentPlayerServer)) {
+            serverTextComponent = serverTextComponent.color(NamedTextColor.GREEN)
+                    .hoverEvent(
+                            showText(
+                                    Component.translatable("velocity.command.server-tooltip-current-server")
+                                            .append(Component.newline())
+                                            .append(playersTextComponent))
+                    );
+        } else {
+            serverTextComponent = serverTextComponent.color(NamedTextColor.GRAY)
+                    .clickEvent(ClickEvent.runCommand("/server " + serverInfo.getName()))
+                    .hoverEvent(
+                            showText(
+                                    Component.translatable("velocity.command.server-tooltip-offer-connect-server")
+                                            .append(Component.newline())
+                                            .append(playersTextComponent))
+                    );
+        }
+        return serverTextComponent;
+    }
+
+    @Override
+    public List<String> suggest(final SimpleCommand.Invocation invocation) {
+        final String[] currentArgs = invocation.arguments();
+        Stream<String> possibilities = server.getAllServers().stream()
+                .map(rs -> rs.getServerInfo().getName());
+
+        if (currentArgs.length == 0) {
+            return possibilities.collect(Collectors.toList());
+        } else if (currentArgs.length == 1) {
+            return possibilities
+                    .filter(name -> name.regionMatches(true, 0, currentArgs[0], 0, currentArgs[0].length()))
+                    .collect(Collectors.toList());
+        } else {
+            return ImmutableList.of();
+        }
+    }
+
+    @Override
+    public boolean hasPermission(final SimpleCommand.Invocation invocation) {
+        return invocation.source().getPermissionValue("velocity.command.server") != Tristate.FALSE;
+    }
+}
+
+// https://github.com/PaperMC/Velocity/blob/b0862d2d16c4ba7560d3f24c824d78793ac3d9e0/proxy/src/main/java/com/velocitypowered/proxy/command/builtin/CommandMessages.java
+
+class CommandMessages {
+
+    public static final TranslatableComponent PLAYERS_ONLY = Component.translatable(
+            "velocity.command.players-only", NamedTextColor.RED);
+    public static final TranslatableComponent SERVER_DOES_NOT_EXIST = Component.translatable(
+            "velocity.command.server-does-not-exist", NamedTextColor.RED);
+}
+
+// https://github.com/PaperMC/Velocity/blob/b0862d2d16c4ba7560d3f24c824d78793ac3d9e0/proxy/src/main/java/com/velocitypowered/proxy/command/builtin/BuiltinCommandUtil.java
+
+class BuiltinCommandUtil {
+
+    private BuiltinCommandUtil() {
+        throw new AssertionError();
+    }
+
+    static List<RegisteredServer> sortedServerList(ProxyServer proxy) {
+        List<RegisteredServer> servers = new ArrayList<>(proxy.getAllServers());
+        servers.sort(Comparator.comparing(RegisteredServer::getServerInfo));
+        return Collections.unmodifiableList(servers);
+    }
+}

src/main/java/de/strifel/VTools/listeners/TGBridge.java

@@ -1,47 +1,67 @@
 package de.strifel.VTools.listeners;
 
-import com.google.common.collect.ImmutableList;
+import com.alpt.vtools.listeners.ServerCloser;
+import com.alpt.vtools.utils.MarkdownString;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 import com.pengrad.telegrambot.Callback;
 import com.pengrad.telegrambot.TelegramBot;
 import com.pengrad.telegrambot.UpdatesListener;
+import com.pengrad.telegrambot.model.Message;
 import com.pengrad.telegrambot.model.Update;
 import com.pengrad.telegrambot.model.User;
+import com.pengrad.telegrambot.model.request.ParseMode;
+import com.pengrad.telegrambot.request.EditMessageText;
+import com.pengrad.telegrambot.request.GetChat;
 import com.pengrad.telegrambot.request.SendMessage;
+import com.pengrad.telegrambot.response.BaseResponse;
+import com.pengrad.telegrambot.response.GetChatResponse;
 import com.pengrad.telegrambot.response.SendResponse;
 import com.velocitypowered.api.event.Subscribe;
 import com.velocitypowered.api.event.connection.DisconnectEvent;
 import com.velocitypowered.api.event.player.ServerConnectedEvent;
+import com.velocitypowered.api.event.player.ServerPostConnectEvent;
 import com.velocitypowered.api.event.proxy.ProxyShutdownEvent;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.ProxyServer;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import de.strifel.VTools.VTools;
 import net.kyori.adventure.text.Component;
-import org.yaml.snakeyaml.Yaml;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.io.IOException;
-import java.io.File;
-import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.function.BiConsumer;
 import java.util.stream.Collectors;
 
 public class TGBridge {
+    private static final long MINUTE = 60_000;
     private final VTools plugin;
     private final ProxyServer server;
+    @SuppressWarnings("java:S3008")
     protected static TGBridge INSTANCE = null;
 
     private TelegramBot bot;
     private String TOKEN = "";
-    private HashSet<Long> CHAT_IDS = new HashSet<>();
+    private long CHAT_ID = 0L;
+
+    private int ONLINE_STATUS_MESSAGE_ID = -1;
 
     private long backoffSec = 1L;
 
-    public TGBridge(VTools plugin) {
+    private static final String DIVIDER = "————————\n";
+    /**
+     * markdown escaped
+     */
+    private String pinNote;
+
+    @SuppressWarnings("java:S3010")
+    public TGBridge(@NotNull VTools plugin) {
+        if (INSTANCE != null) {
+            throw new IllegalStateException();
+        }
         INSTANCE = this;
         this.plugin = plugin;
         this.server = plugin.getServer();
@@ -50,85 +70,141 @@ public class TGBridge {
     public void register() {
         server.getEventManager().register(plugin, this);
         botInit();
+        initUpdateThread();
     }
 
     private void loadConfig() {
-        try {
-            File configDir = plugin.dataDirectory.toFile();
-            if (!configDir.exists()) {
-                configDir.mkdir();
-            }
-            File configFile = new File(configDir, "config.yaml");
-            if (!configFile.exists()) {
-                Files.write(Path.of(configFile.toURI()), "chat_id:\n- \"0\"\ntoken: \"\"\n".getBytes(StandardCharsets.UTF_8));
-            }
-            String configStr = Files.readString(Path.of(configFile.toURI()), StandardCharsets.UTF_8);
-            Yaml yaml = new Yaml();
-            Map<String, Object> config = yaml.load(configStr);
-            synchronized (this) {
-                ((List<String>)config.getOrDefault("chat_id", List.of())).stream().forEach(s -> this.CHAT_IDS.add(Long.parseLong(s)));
-                this.CHAT_IDS.removeIf(id -> id == 0L);
-                this.TOKEN = (String)config.getOrDefault("token", "");
-            }
-        } catch (Exception e) {
-            plugin.logger.error("parsing config", e);
+        synchronized (this) {
+            CHAT_ID = Long.parseLong(plugin.getConfigOrDefault("chat_id", "0"));
+            TOKEN = plugin.getConfigOrDefault("token", "");
         }
     }
 
     private void botInit() {
         loadConfig();
-        if (TOKEN.isEmpty() || CHAT_IDS.isEmpty()) return;
+        if (TOKEN.isEmpty() || CHAT_ID == 0L) return;
         bot = new TelegramBot(TOKEN);
+        getPinnedMessage();
         bot.setUpdatesListener(updates -> {
             backoffSec = 1L;
             for (Update update : updates) {
-                try {
-                    if (update != null &&
-                        update.message() != null &&
-                        update.message().chat() != null &&
-                        CHAT_IDS.contains(update.message().chat().id()) &&
-                        update.message().from() != null
-                    ) {
-                        if (update.message().text() != null && !update.message().text().isEmpty()) {
-                            String msg = update.message().text();
-                            if (msg.equals("/list")) {
-                                ArrayList<String> out = new ArrayList<>();
-                                String fmt = server.getAllPlayers().size() > 1 ? "%d players are currently connected to the proxy." : "%d player is currently connected to the proxy.";
-                                out.add(String.format(fmt, server.getAllPlayers().size()));
-                                List<RegisteredServer> servers = new ArrayList<>(server.getAllServers());
-                                for (RegisteredServer server : servers) {
-                                    List<Player> onServer = ImmutableList.copyOf(server.getPlayersConnected());
-                                    if (!onServer.isEmpty()) {
-                                        out.add(String.format("[%s] (%d): %s",
-                                                server.getServerInfo().getName(),
-                                                onServer.size(),
-                                                onServer.stream().map(Player::getUsername).collect(Collectors.joining(", ")))
-                                        );
 
+                try {
+                    if (update == null || update.message() == null) continue;
+                    Message message = update.message();
+                    if (message.chat() == null || message.chat().id() != CHAT_ID || message.from() == null) continue;
+
+                    mergeMessage.abort();
+
+                    String text = "";
+                    Message replyTo = message.replyToMessage();
+                    if (replyTo != null) {
+                        text += "[reply > ";
+                        String replyText = "";
+                        String replyType = getMessageType(replyTo);
+                        if (replyTo.text() != null) {
+                            replyText += replyTo.text();
+                        }
+                        if (replyType != null) {
+                            replyText += replyType;
+                            if (replyTo.caption() != null) {
+                                replyText += " \"" + replyTo.caption() + "\"";
+                            }
+                        }
+                        if (replyText.equals("")) {
+                            replyText = "？";
+                        }
+                        text += replyText + "] ";
+                    }
+
+                    if (message.text() != null && !message.text().isEmpty()) {
+                        String msgText = message.text();
+                        if (msgText.startsWith("/")) {
+                            String[] s = msgText.split("((@\\w+bot)|(@\\w+bot)?[\t \n]+)", 2);
+                            String command = s[0];
+                            @Nullable String arg = s.length == 2 ? s[1] : null;
+                            System.out.println(command);
+                            switch (command) {
+                                case "/list" -> outbound(genOnlineStatus(), ParseMode.MarkdownV2);
+                                case "/setpin" -> {
+                                    if (arg == null || arg.length() == 0) {
+                                        if (replyTo == null) {
+                                            outbound("""
+                                                    usage:
+                                                    use "/setpin" reply a message that from the bot to set that message to pin-message,
+                                                    or use "/setpin <note>" to update current pinned message.""");
+                                            continue;
+                                        }
+                                        ONLINE_STATUS_MESSAGE_ID = replyTo.messageId();
+                                        updateOnlineStatus();
+                                        continue;
+                                    }
+                                    if (replyTo != null && (replyTo.from() == null || replyTo.messageId() <= 0)) {
+                                        outbound("must reply a message that from the bot (or reply nothing).");
+                                        continue;
+                                    }
+
+                                    String markdownString = MarkdownString.markdownString(message);
+
+                                    String shouldBeCommand = markdownString.substring(0, "/setpin ".length());
+                                    if (!shouldBeCommand.matches("/setpin[\t \n]")) {
+                                        outbound("\"/setpin\" must be plain text.");
+                                        continue;
+                                    }
+
+
+                                    outbound("old pinned note: \n" + pinNote, ParseMode.MarkdownV2);
+
+                                    pinNote = markdownString.substring("/setpin ".length());
+                                    if (replyTo != null) {
+                                        ONLINE_STATUS_MESSAGE_ID = replyTo.messageId();
+                                    }
+                                    updateOnlineStatus();
+                                }
+                                case "/genpin" -> outbound(genPinMessage(),
+                                        (sendMessage, sendResponse) -> {
+                                            if (!sendResponse.isOk()) {
+                                                plugin.logger.error(String.format("sendMessage error %d: %s", sendResponse.errorCode(), sendResponse.description()));
+                                            } else {
+                                                int messageId = sendResponse.message().messageId();
+                                                ONLINE_STATUS_MESSAGE_ID = messageId > 0 ? messageId : ONLINE_STATUS_MESSAGE_ID;
+                                            }
+                                        }, ParseMode.MarkdownV2
+                                );
+                                case "/shutdown" -> {
+                                    if (server.getAllPlayers().isEmpty()) {
+                                        ServerCloser.INSTANCE.fastShutdown();
+                                        outbound("服务器即将在一分钟后关机，使用 /fuck 以取消。");
+                                    } else {
+                                        outbound("still player online, can't shutdown.");
                                     }
                                 }
-                                outbound(String.join("\n", out));
+                                case "/fuck" -> {
+                                    if (server.getAllPlayers().isEmpty()) {
+                                        if("fuck".equalsIgnoreCase(arg)){
+                                            ServerCloser.INSTANCE.noShutdown();
+                                            outbound("shutdown timer disabled until next player join & left.");
+                                        }else {
+                                            ServerCloser.INSTANCE.slowShutdown();
+                                            outbound("shutdown timer has been set to 60 minutes.");
+                                        }
+                                    } else {
+                                        outbound("still player online, will not shutdown.");
+                                    }
+                                }
+                                default -> {}
                             }
-                            tgInbound(update.message().from(), msg);
-                        }
-                        else if (update.message().sticker() != null) {
-                            tgInbound(update.message().from(), "[sticker]");
-                        }
-                        else if (update.message().photo() != null) {
-                            tgInbound(update.message().from(), "[photo]");
-                        }
-                        else if (update.message().audio() != null) {
-                            tgInbound(update.message().from(), "[audio]");
-                        }
-                        else if (update.message().voice() != null) {
-                            tgInbound(update.message().from(), "[voice]");
-                        }
-                        else if (update.message().document() != null) {
-                            tgInbound(update.message().from(), "[document]");
                         }
+                        text += msgText;
                     }
-                }
-                catch (Exception e) {
+                    String messageType = getMessageType(message);
+                    if (messageType != null) {
+                        text += "[" + messageType + (message.caption() != null ? " \"" + message.caption() + "\"]" : "]");
+                    }
+                    if (!text.equals("")) {
+                        tgInbound(message.from(), text);
+                    }
+                } catch (Exception e) {
                     plugin.logger.error("handling update", e);
                 }
             }
@@ -136,7 +212,7 @@ public class TGBridge {
         }, (e) -> {
             plugin.logger.error("getting update", e);
             plugin.logger.error(String.format("waiting %ds before getting another update", backoffSec));
-            try { Thread.sleep(backoffSec * 1000); } catch (InterruptedException ignored) {}
+            try {Thread.sleep(backoffSec * 1000);} catch (InterruptedException ignored) {}
             backoffSec *= 2L;
             if (backoffSec > 3600) {
                 backoffSec = 3600;
@@ -144,6 +220,101 @@ public class TGBridge {
         });
     }
 
+    private static String getMessageType(Message message) {
+        if (message.sticker() != null) {
+            String emoji = message.sticker().emoji();
+            return emoji != null ? "sticker " + emoji : "sticker";
+        }
+
+        if (message.photo() != null) {
+            return "photo";
+        }
+        if (message.audio() != null) {
+            return "audio";
+        }
+        if (message.voice() != null) {
+            return "voice";
+        }
+        if (message.document() != null) {
+            return "document";
+        }
+        return null;
+    }
+
+    private boolean getPinnedMessage() {
+        try {
+            GetChatResponse response = bot.execute(new GetChat(CHAT_ID));
+            Message pinnedMessage = response.chat().pinnedMessage();
+            readOldPinnedMessage(pinnedMessage);
+            updateOnlineStatus();
+        } catch (RuntimeException e) {
+            plugin.logger.error("get group info failed.");
+            throw e;
+        }
+        return true;
+    }
+
+    private void readOldPinnedMessage(Message message) {
+        ONLINE_STATUS_MESSAGE_ID = message.messageId();
+        String markdownText = MarkdownString.markdownString(message);
+
+        String[] s = markdownText.split(DIVIDER, 2);
+        pinNote = (s.length == 2) ?
+                s[1] :
+                "\r_\r" + MarkdownString.escapeStr("(use \"/setpin\" <note> to set note here)") + "\r_\r";
+    }
+
+    /**
+     * @return markdown escaped str
+     */
+    private String genPinMessage() {
+        return (pinNote != null && pinNote.length() != 0) ?
+                genOnlineStatus() + "\n\n" + DIVIDER + pinNote :
+                genOnlineStatus();
+    }
+
+    /**
+     * @return markdown escaped str
+     */
+
+    private int shutdownCountMinutes = -1;
+
+    public static void setShuttingDown(int minute) {
+        INSTANCE.shutdownCountMinutes = minute;
+        INSTANCE.updateOnlineStatus();
+    }
+
+    private String genOnlineStatus() {
+        ArrayList<String> out = new ArrayList<>();
+        int playerCount = server.getAllPlayers().size();
+        out.add(switch (playerCount) {
+            case 0 -> "nobody here\\.";
+            case 1 -> "only one player online\\.";
+            default -> playerCount + " players online\\.";
+        });
+        List<RegisteredServer> registeredServers = new ArrayList<>(server.getAllServers());
+        for (RegisteredServer registeredServer : registeredServers) {
+            LinkedList<Player> onServer = new LinkedList<>();
+            for (Player player : registeredServer.getPlayersConnected()) {
+                if (!lastDisconnect.equals(player.getUsername())) {
+                    onServer.add(player);
+                }
+            }
+            if (!onServer.isEmpty()) {
+                out.add(
+                        String.format("\\[%s\\] \\(%d\\): %s",
+                                "`" + MarkdownString.escapeStr(registeredServer.getServerInfo().getName()) + "`",
+                                onServer.size(),
+                                onServer.stream().map(player -> "`" + MarkdownString.escapeStr(player.getUsername()) + "`").collect(Collectors.joining(", ")))
+                );
+            }
+        }
+        String result = String.join("\n", out);
+        if (shutdownCountMinutes < 0) return result;
+        if (shutdownCountMinutes == 0 || PROXY_SHUT_DOWN) return "server already shutdown\\.%n%s".formatted(result);
+        return "server will shutdown after %s minute\\.%n%s".formatted(shutdownCountMinutes, result);
+    }
+
     protected void tgInbound(User user, String content) {
         inbound(String.format("[tg] <%s> %s", user.lastName() == null ? user.firstName() : String.format("%s %s", user.firstName(), user.lastName()), content));
     }
@@ -156,26 +327,50 @@ public class TGBridge {
         }
     }
 
-    protected void outbound(String content) {
+
+    protected void outbound(String content, ParseMode parseMode) {
+        outbound(content, (sendMessage, sendResponse) -> {
+            if (!sendResponse.isOk()) {
+                plugin.logger.error(String.format("sendMessage error %d: %s", sendResponse.errorCode(), sendResponse.description()));
+            }
+        }, parseMode);
+    }
+
+    public static void error(String context) {
+        INSTANCE.appendMessage("*" + MarkdownString.escapeStr(context) + "*");
+    }
+
+    public static void log(String context) {
+        INSTANCE.appendMessage("_" + MarkdownString.escapeStr(context) + "_");
+    }
+
+    protected void outbound(String content) {outbound(content, (ParseMode) null);}
+
+
+    protected void outbound(String content, @NotNull BiConsumer<SendMessage, SendResponse> onResponse) {outbound(content, onResponse, null);}
+
+    protected void outbound(String content, @NotNull BiConsumer<SendMessage, SendResponse> onResponse, ParseMode parseMode) {
         if (bot == null) return;
         if (content.length() > 4000) {
             content = content.substring(0, 4000);
         }
-        for (long CHAT_ID : CHAT_IDS) {
-            bot.execute(new SendMessage(CHAT_ID, content), new Callback<SendMessage, SendResponse>() {
-                @Override
-                public void onResponse(SendMessage sendMessage, SendResponse sendResponse) {
-                    if (!sendResponse.isOk()) {
-                        plugin.logger.error(String.format("sendMessage error %d: %s", sendResponse.errorCode(), sendResponse.description()));
-                    }
-                }
 
-                @Override
-                public void onFailure(SendMessage sendMessage, IOException e) {
-                    plugin.logger.error("sending message", e);
-                }
-            });
+        SendMessage sendMessage = new SendMessage(CHAT_ID, content);
+        if (parseMode != null) {
+            boolean a = sendMessage == sendMessage.parseMode(parseMode);
+            assert a;
         }
+        bot.execute(sendMessage, new Callback<SendMessage, SendResponse>() {
+            @Override
+            public void onResponse(SendMessage sendMessage, SendResponse sendResponse) {
+                onResponse.accept(sendMessage, sendResponse);
+            }
+
+            @Override
+            public void onFailure(SendMessage sendMessage, IOException e) {
+                plugin.logger.error("sending message", e);
+            }
+        });
     }
 
     @Subscribe
@@ -183,21 +378,219 @@ public class TGBridge {
         if (bot == null) return;
         bot.removeGetUpdatesListener();
         bot.shutdown();
+        PROXY_SHUT_DOWN = true;
     }
 
     @Subscribe
     public void onServerConnected(ServerConnectedEvent event) {
-        if (event.getPreviousServer().isEmpty()) {
-            if (!event.getPlayer().hasPermission("vtools.globalchat.bypassbridge.join")) {
-                outbound(String.format("%s joined the proxy", event.getPlayer().getUsername()));
+        if (event.getPreviousServer().isEmpty() && !event.getPlayer().hasPermission("vtools.globalchat.bypassbridge.join")) {
+            String username = event.getPlayer().getUsername();
+            if (lastDisconnect.equals(username)) {
+                lastDisconnect = "";
             }
+            joinLeftAnnounce(String.format("`%s` joined the server\\.", MarkdownString.escapeStr(username)));
         }
+        updateRequests.add(new UpdateRequest());
     }
 
+    private String lastDisconnect = "";
+
     @Subscribe
     public void onDisconnect(DisconnectEvent event) {
         if (!event.getPlayer().hasPermission("vtools.globalchat.bypassbridge.join")) {
-            outbound(String.format("%s left the proxy", event.getPlayer().getUsername()));
+            String username = event.getPlayer().getUsername();
+            if (username != null) {
+                lastDisconnect = username;
+                joinLeftAnnounce(String.format("`%s` left the server\\.", MarkdownString.escapeStr(username)));
+            }
+        }
+        updateRequests.add(new UpdateRequest());
+    }
+
+
+    @Subscribe
+    public void onServerPostConnect(ServerPostConnectEvent event) {
+        updateRequests.add(new UpdateRequest());
+    }
+
+
+    private boolean PROXY_SHUT_DOWN = false;
+
+    private static class UpdateRequest {}
+
+    private LinkedBlockingQueue<UpdateRequest> updateRequests = new LinkedBlockingQueue<>();
+
+    @SuppressWarnings("java:S3776")
+    private void initUpdateThread() {
+        new Thread(() -> {
+            while (true) {
+                if (PROXY_SHUT_DOWN) {
+                    setOnlineStatusNotAvailable();
+                    return;
+                }
+                UpdateRequest oldestRequest = null;
+                try {
+                    oldestRequest = updateRequests.take();
+                } catch (InterruptedException ignored) {}
+                if (oldestRequest == null) {
+                    plugin.logger.warn("updateRequests.take() return a null value, why?");
+                    sleep(10000);
+                    continue;
+                }
+                updateRequests.clear();
+
+                if (!updateOnlineStatus()) {
+                    updateRequests.add(oldestRequest); // 更新失败 回去吧您内
+                    sleep(10000);
+                }
+            }
+        }).start();
+        new Thread(() -> {
+            while (true) {
+                if (PROXY_SHUT_DOWN) {
+                    return;
+                }
+                try {
+                    String oldestMessage = announceQueue.take();
+                    appendMessage(oldestMessage);
+                } catch (InterruptedException ignored) {}
+            }
+        }).start();
+    }
+
+    private static final Object mergeMessageLock = new Object();
+
+    private void appendMessage(String message) {
+        synchronized (mergeMessageLock) {
+            if (!mergeMessage.isValid()) {
+                mergeMessage = new MergeMessage(message);
+            } else {
+                mergeMessage.addLines(message);
+            }
         }
     }
+
+    private static void sleep(int millis) {
+        try {
+            Thread.sleep(millis);
+        } catch (InterruptedException ignored) {}
+    }
+
+    protected boolean updateOnlineStatus() {
+        return editOnlineStatusMessage(genPinMessage());
+    }
+
+    protected boolean setOnlineStatusNotAvailable() {
+        return updateOnlineStatus();
+//        return editOnlineStatusMessage("（proxy already shutdown）");
+    }
+
+    private static final Gson prettyGson = new GsonBuilder().setPrettyPrinting().create();
+
+    protected boolean editOnlineStatusMessage(String markdownText) {
+        if (ONLINE_STATUS_MESSAGE_ID < 1) {
+            return true;
+        }
+        BaseResponse response;
+        try {
+            response = bot.execute(new EditMessageText(CHAT_ID, ONLINE_STATUS_MESSAGE_ID, markdownText).parseMode(ParseMode.MarkdownV2).disableWebPagePreview(true));
+            if (!response.isOk()) {
+                if (response.description().equals("Bad Request: message is not modified: specified new message content and reply markup are exactly the same as a current content and reply markup of the message")) {
+                    return true;
+                }
+                String responseJSON = prettyGson.toJson(response);
+                plugin.logger.warn("update failed: {}", responseJSON);
+            }
+            return response.isOk();
+        } catch (RuntimeException e) {
+            e.printStackTrace();
+            return false;
+        }
+
+    }
+
+    private class MergeMessage {
+        private int messageId;
+        private long time;
+        private long timeMinute;
+
+        private StringBuilder text;
+        private boolean abort = false;
+
+        boolean isValid() {
+            if (abort || messageId < 1) return false;
+            long current = System.currentTimeMillis();
+            if (current / MINUTE != timeMinute) return false;
+            long dt = current - time;
+            return dt <= 30_000 && dt >= 0;
+        }
+
+        private void abort() {
+            abort = true;
+        }
+
+        protected MergeMessage(String firstMessage) {
+            text = new StringBuilder(firstMessage);
+            time = System.currentTimeMillis();
+            timeMinute = time / MINUTE;
+            send();
+        }
+
+        private void send() {
+            if (bot == null) {
+                messageId = -1;
+                return;
+            }
+            SendResponse response;
+            try {
+                response = bot.execute(new SendMessage(CHAT_ID, text.toString()).parseMode(ParseMode.MarkdownV2));
+
+            } catch (RuntimeException e) {
+                messageId = -1;
+                return;
+            }
+            if (!response.isOk()) {
+                messageId = -1;
+                return;
+            }
+            messageId = response.message().messageId();
+        }
+
+        protected MergeMessage() {
+            messageId = 0;
+            time = 0;
+            timeMinute = 0;
+            text = new StringBuilder();
+            abort = false;
+        } //dummy
+
+        private void addLines(String... messages) {
+            for (String message : messages) {
+                text.append('\n').append(message);
+            }
+            update();
+        }
+
+        private void update() {
+            if (!isValid()) {
+                plugin.logger.error("message should only push to a valid object");
+                return;
+            }
+            if (bot == null) {
+                messageId = -1;
+                return;
+            }
+            try {
+                bot.execute(new EditMessageText(CHAT_ID, messageId, text.toString()).parseMode(ParseMode.MarkdownV2));
+            } catch (RuntimeException ignored) {}
+        }
+    }
+
+    private MergeMessage mergeMessage = new MergeMessage();
+    private LinkedBlockingQueue<String> announceQueue = new LinkedBlockingQueue<>();
+
+    private void joinLeftAnnounce(String message) {
+        announceQueue.add(message);
+    }
+
 }

src/main/java/de/strifel/VTools/listeners/utils/GlistUtil.java

@@ -7,6 +7,7 @@ import com.velocitypowered.api.proxy.server.RegisteredServer;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TextComponent;
 import net.kyori.adventure.text.TranslatableComponent;
+import net.kyori.adventure.text.event.ClickEvent;
 import net.kyori.adventure.text.format.NamedTextColor;
 
 import java.util.ArrayList;
@@ -53,7 +54,10 @@ public class GlistUtil {
 
         TextComponent.Builder builder = Component.text()
                 .append(Component.text("[" + server.getServerInfo().getName() + "] ",
-                        NamedTextColor.DARK_AQUA))
+                        NamedTextColor.DARK_AQUA)
+                        .clickEvent(ClickEvent.runCommand("/server " + server.getServerInfo().getName()))
+
+                )
                 .append(Component.text("(" + onServer.size() + ")", NamedTextColor.GRAY))
                 .append(Component.text(": "))
                 .resetStyle();