Keep global chat readable after writing into it on fight servers

Writing /global <text> on a fight server shows the global chat until
the player leaves the server or runs /chat global leave, without
changing the default channel.

VelocityCore/src/de/steamwar/messages/BungeeCore.properties

@@ -621,6 +621,7 @@ CHAT_MSG_USAGE = §8/§7chat §8[§echannel§8] §7msg §8[§emessage§8]
 CHAT_ARENAS_USAGE = §8/§7chat §7arenas §8[§ejoin§8|§eleave§8]
 CHAT_ARENAS_JOINED = §7You now read the chats of all fights.
 CHAT_ARENAS_LEFT = §7You no longer read the chats of all fights.
+CHAT_GLOBAL_AFTER_WRITING = §7You read §e{0} §7on this server until you leave it.
 CHAT_CHANNEL_UNKNOWN = §cUnknown chat channel.
 CHAT_CHANNEL_JOINED = §7You are reading §e{0} §7again.
 CHAT_CHANNEL_LEFT = §7You no longer read §e{0}§7.

VelocityCore/src/de/steamwar/messages/BungeeCore_de.properties

@@ -586,6 +586,7 @@ CHAT_MSG_USAGE = §8/§7chat §8[§eKanal§8] §7msg §8[§eNachricht§8]
 CHAT_ARENAS_USAGE = §8/§7chat §7arenas §8[§ejoin§8|§eleave§8]
 CHAT_ARENAS_JOINED = §7Du liest jetzt die Chats aller Fights mit.
 CHAT_ARENAS_LEFT = §7Du liest die Chats aller Fights nicht mehr mit.
+CHAT_GLOBAL_AFTER_WRITING = §7Du liest §e{0} §7auf diesem Server mit, bis du ihn verlässt.
 CHAT_CHANNEL_UNKNOWN = §cUnbekannter Chatkanal.
 CHAT_CHANNEL_JOINED = §7Du liest §e{0} §7wieder mit.
 CHAT_CHANNEL_LEFT = §7Du liest §e{0} §7nicht mehr mit.

VelocityCore/src/de/steamwar/velocitycore/chat/ChatManager.java

@@ -75,6 +75,8 @@ public class ChatManager extends BasicListener {
     private static final Map<UUID, ChatChannel> defaults = new ConcurrentHashMap<>();
     private static final Map<UUID, String> persisted = new ConcurrentHashMap<>();
     private static final Set<UUID> globalOnArena = ConcurrentHashMap.newKeySet();
+    // Players who wrote into the global chat on their current fight server and read it until they leave the server
+    private static final Set<UUID> globalAfterWriting = ConcurrentHashMap.newKeySet();
     private static final Set<UUID> announced = ConcurrentHashMap.newKeySet();
     private static final Map<UUID, Set<RegisteredServer>> spies = new ConcurrentHashMap<>();
     private static final Map<UUID, Boolean> allArenas = new ConcurrentHashMap<>();
@@ -159,7 +161,20 @@ public class ChatManager extends BasicListener {
     }
 
     static boolean readsGlobal(Player player) {
-        return !currentServer(player).map(ChatManager::isArena).orElse(false) || globalOnArena.contains(player.getUniqueId());
+        UUID uuid = player.getUniqueId();
+        return !currentServer(player).map(ChatManager::isArena).orElse(false) || globalOnArena.contains(uuid) || globalAfterWriting.contains(uuid);
+    }
+
+    /**
+     * Shows the global chat to a player who wrote into it on a fight server until they leave the server.
+     */
+    public static void readGlobalAfterWriting(PlayerChatter player) {
+        if (!currentServer(player.getPlayer()).map(ChatManager::isArena).orElse(false)) return;
+        if (!reads(player, global.persistId())) return;
+
+        if (globalAfterWriting.add(player.user().getUUID())) {
+            player.system("CHAT_GLOBAL_AFTER_WRITING", global.tag(player));
+        }
     }
 
     /**
@@ -283,6 +298,12 @@ public class ChatManager extends BasicListener {
             return;
         }
 
+        // Leaving the global chat read after writing into it only ends that, it does not leave the global chat everywhere
+        if (channel == global && globalAfterWriting.remove(uuid)) {
+            player.system("CHAT_CHANNEL_LEFT", channel.tag(player));
+            return;
+        }
+
         if (hidden(uuid).add(id)) {
             saveHidden(uuid);
         }
@@ -457,6 +478,7 @@ public class ChatManager extends BasicListener {
 
         UUID uuid = player.getUniqueId();
         globalOnArena.remove(uuid);
+        globalAfterWriting.remove(uuid);
 
         ChatChannel current = defaults.get(uuid);
         ChatChannel next;
@@ -477,6 +499,7 @@ public class ChatManager extends BasicListener {
         defaults.remove(uuid);
         persisted.remove(uuid);
         globalOnArena.remove(uuid);
+        globalAfterWriting.remove(uuid);
         announced.remove(uuid);
         spies.remove(uuid);
         allArenas.remove(uuid);

VelocityCore/src/de/steamwar/velocitycore/commands/GlobalCommand.java

@@ -23,6 +23,7 @@ package de.steamwar.velocitycore.commands;
 import de.steamwar.command.SWCommand;
 import de.steamwar.linkage.Linked;
 import de.steamwar.messages.Chatter;
+import de.steamwar.messages.PlayerChatter;
 import de.steamwar.velocitycore.chat.ChatManager;
 
 @Linked
@@ -35,5 +36,8 @@ public class GlobalCommand extends SWCommand {
     @Register(description = "GLOBAL_USAGE")
     public void genericCommand(Chatter sender, String... message) {
         ChatManager.sendOrSwitch(sender, ChatManager.getGlobal(), message, "GLOBAL_USAGE");
+        if (message.length > 0 && sender instanceof PlayerChatter player) {
+            ChatManager.readGlobalAfterWriting(player);
+        }
     }
 }