From fda80d9f9de42f609a0d59b135a4efd7fe2f8bf1 Mon Sep 17 00:00:00 2001
From: DmitriyMX <dimon550@gmail.com>
Date: Thu, 6 May 2021 17:05:20 +0300
Subject: [PATCH] ScoreboardDisplayPacket

---
 protocol/src/main/java/mc/protocol/State.java |  1 +
 .../server/ScoreboardDisplayPacket.java       | 39 +++++++++++++++++++
 .../mc/protocol/utils/ScoreboardPosition.java | 10 +++++
 .../main/java/mc/server/PacketHandler.java    |  9 +++++
 4 files changed, 59 insertions(+)
 create mode 100644 protocol/src/main/java/mc/protocol/packets/server/ScoreboardDisplayPacket.java
 create mode 100644 protocol/src/main/java/mc/protocol/utils/ScoreboardPosition.java

diff --git a/protocol/src/main/java/mc/protocol/State.java b/protocol/src/main/java/mc/protocol/State.java
index 6159b43..e46a2d1 100644
--- a/protocol/src/main/java/mc/protocol/State.java
+++ b/protocol/src/main/java/mc/protocol/State.java
@@ -56,6 +56,7 @@ public enum State {
 			Map.of(
 					PingPacket.class, 0x1F,
 					JoinGamePacket.class, 0x23,
+					ScoreboardDisplayPacket.class, 0x3B,
 					SpawnPositionPacket.class, 0x46,
 					ChunkDataPacket.class, 0x20,
 					PlayerAbilitiesPacket.class,0x2C,
diff --git a/protocol/src/main/java/mc/protocol/packets/server/ScoreboardDisplayPacket.java b/protocol/src/main/java/mc/protocol/packets/server/ScoreboardDisplayPacket.java
new file mode 100644
index 0000000..9e3acf3
--- /dev/null
+++ b/protocol/src/main/java/mc/protocol/packets/server/ScoreboardDisplayPacket.java
@@ -0,0 +1,39 @@
+package mc.protocol.packets.server;
+
+import lombok.Data;
+import mc.protocol.io.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Отображение Scoreboard.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD      | TYPE        | NOTES                          |
+ * |------------|-------------|--------------------------------|
+ * | Position   | Byte        | Положение:                     |
+ * |            |             | 0 - list                       |
+ * |            |             | 1 - sidebar                    |
+ * |            |             | 2 - below name                 |
+ * |            |             | 3-18 - team specific sidebar   |
+ * | Score Name | String (16) | Уникальное название Scoreboard |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Display_Scoreboard" target="_top">Display Scoreboard</a>
+ */
+@Data
+public class ScoreboardDisplayPacket implements ServerSidePacket {
+
+	private int position;
+	private String name;
+
+	public void setPosition(int position) {
+		this.position = (position < 0) ? 0 : (Math.min(position, 18));
+	}
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeByte(position);
+		netByteBuf.writeString(name);
+	}
+}
diff --git a/protocol/src/main/java/mc/protocol/utils/ScoreboardPosition.java b/protocol/src/main/java/mc/protocol/utils/ScoreboardPosition.java
new file mode 100644
index 0000000..bb5642e
--- /dev/null
+++ b/protocol/src/main/java/mc/protocol/utils/ScoreboardPosition.java
@@ -0,0 +1,10 @@
+package mc.protocol.utils;
+
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
+public class ScoreboardPosition {
+	public final int LIST = 0;
+	public final int SIDEBAR = 1;
+	public final int BELOW_NAME = 2;
+}
diff --git a/server/src/main/java/mc/server/PacketHandler.java b/server/src/main/java/mc/server/PacketHandler.java
index bf35af9..a7ec96d 100644
--- a/server/src/main/java/mc/server/PacketHandler.java
+++ b/server/src/main/java/mc/server/PacketHandler.java
@@ -16,6 +16,7 @@ import mc.protocol.serializer.TextSerializer;
 import mc.protocol.utils.Difficulty;
 import mc.protocol.utils.GameMode;
 import mc.protocol.utils.LevelType;
+import mc.protocol.utils.ScoreboardPosition;
 import mc.server.config.Config;
 import org.apache.commons.io.IOUtils;
 
@@ -122,6 +123,14 @@ public class PacketHandler {
 		context.send(pingPacket);
 
 		context.flushSending();
+
+		// --- Эксперименты --- //
+
+		ScoreboardDisplayPacket scoreboardDisplayPacket = new ScoreboardDisplayPacket();
+		scoreboardDisplayPacket.setPosition(ScoreboardPosition.LIST);
+		scoreboardDisplayPacket.setName("Score::List");
+
+		context.sendNow(scoreboardDisplayPacket);
 	}
 
 	private static String faviconToBase64(Path iconPath) {