more work

proxy/src/main/java/com/velocitypowered/proxy/connection/registry/ChatData.java

@@ -34,6 +34,7 @@ import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
 import com.velocitypowered.api.network.ProtocolVersion;
 import java.util.List;
+import net.kyori.adventure.nbt.BinaryTag;
 import net.kyori.adventure.nbt.CompoundBinaryTag;
 import net.kyori.adventure.nbt.ListBinaryTag;
 import net.kyori.adventure.text.format.NamedTextColor;
@@ -49,8 +50,16 @@ public class ChatData {
   private final String identifier;
   private final int id;
   private final Decoration chatDecoration;
-  private Decoration narrationDecoration;
+  private final Decoration narrationDecoration;
 
+  /**
+   * Represents a ChatRegistry entry.
+   *
+   * @param id chat type id
+   * @param identifier chat type identifier
+   * @param chatDecoration chat decoration
+   * @param narrationDecoration narration decoration
+   */
   public ChatData(int id, String identifier, Decoration chatDecoration, Decoration narrationDecoration) {
     this.id = id;
     this.identifier = identifier;
@@ -105,7 +114,14 @@ public class ChatData {
     return id;
   }
 
-
+  /**
+   * Encodes the chat data for the network.
+   * @param version The protocol version to encode this chat data for
+   * @return The encoded data structure
+   */
+  public CompoundBinaryTag encodeAsCompoundTag(ProtocolVersion version) {
+    return null;
+  }
 
 
   public static class Decoration implements Translatable {

proxy/src/main/java/com/velocitypowered/proxy/connection/registry/ChatRegistry.java

@@ -52,7 +52,16 @@ public final class ChatRegistry {
     return builder.build();
   }
 
-  public BinaryTag build() {
-    return null;
+  /**
+   * Serialises the Chat Registry for sending over the network.
+   * @param version the version to encode for
+   * @return The serialised tag list
+   */
+  public ListBinaryTag encodeRegistry(ProtocolVersion version) {
+    final ListBinaryTag.Builder<BinaryTag> builder = ListBinaryTag.builder();
+    for (ChatData data : registeredChatTypes.values()) {
+      builder.add(data.encodeAsCompoundTag(version));
+    }
+    return builder.build();
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/JoinGame.java

@@ -393,7 +393,11 @@ public class JoinGame implements MinecraftPacket {
       registryContainer.put("minecraft:dimension_type", dimensionRegistryEntry.build());
       registryContainer.put("minecraft:worldgen/biome", biomeRegistry);
       if (version.compareTo(ProtocolVersion.MINECRAFT_1_19) >= 0) {
-        registryContainer.put("minecraft:chat_type", chatTypeRegistry.build());
+        final ListBinaryTag encodedChatRegistry = chatTypeRegistry.encodeRegistry(version);
+        CompoundBinaryTag.Builder chatRegistryEntry = CompoundBinaryTag.builder();
+        chatRegistryEntry.putString("type", "minecraft:chat_type");
+        chatRegistryEntry.put("value", encodedChatRegistry);
+        registryContainer.put("minecraft:chat_type", encodedChatRegistry);
       }
     } else {
       registryContainer.put("dimension", encodedDimensionRegistry);