From 47e6c3e76f65a41cc789cf1c3f180b2479767b38 Mon Sep 17 00:00:00 2001
From: DmitriyMX <dimon550@gmail.com>
Date: Sat, 8 May 2021 18:34:52 +0300
Subject: [PATCH] SChatPacket

---
 protocol/src/main/java/mc/protocol/State.java |  1 +
 .../protocol/packets/server/SChatPacket.java  | 36 +++++++++++++++++++
 .../java/mc/protocol/utils/ChatPosition.java  | 15 ++++++++
 .../main/java/mc/server/PacketHandler.java    | 10 ++++++
 4 files changed, 62 insertions(+)
 create mode 100644 protocol/src/main/java/mc/protocol/packets/server/SChatPacket.java
 create mode 100644 protocol/src/main/java/mc/protocol/utils/ChatPosition.java

diff --git a/protocol/src/main/java/mc/protocol/State.java b/protocol/src/main/java/mc/protocol/State.java
index 6159b43..0c4d257 100644
--- a/protocol/src/main/java/mc/protocol/State.java
+++ b/protocol/src/main/java/mc/protocol/State.java
@@ -54,6 +54,7 @@ public enum State {
 			),
 			// client bound
 			Map.of(
+					SChatPacket.class, 0x0F,
 					PingPacket.class, 0x1F,
 					JoinGamePacket.class, 0x23,
 					SpawnPositionPacket.class, 0x46,
diff --git a/protocol/src/main/java/mc/protocol/packets/server/SChatPacket.java b/protocol/src/main/java/mc/protocol/packets/server/SChatPacket.java
new file mode 100644
index 0000000..3456535
--- /dev/null
+++ b/protocol/src/main/java/mc/protocol/packets/server/SChatPacket.java
@@ -0,0 +1,36 @@
+package mc.protocol.packets.server;
+
+import lombok.Data;
+import mc.protocol.io.NetByteBuf;
+import mc.protocol.model.text.Text;
+import mc.protocol.packets.ServerSidePacket;
+import mc.protocol.serializer.TextSerializer;
+import mc.protocol.utils.ChatPosition;
+
+/**
+ * Chat packet.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD     | TYPE | NOTES                                         |
+ * |-----------|------|-----------------------------------------------|
+ * | JSON Data | Text | Текст                                         |
+ * | Position  | Byte | 0 - сообщение чата                            |
+ * |           |      | 1 - системное сообщение (отображается в чате) |
+ * |           |      | 2 - над панелью быстрого доступа (hotbar)     |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Chat_Message_.28clientbound.29">Chat Message (clientbound)</a>
+ */
+@Data
+public class SChatPacket implements ServerSidePacket {
+
+	private Text message;
+	private ChatPosition position;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeString(TextSerializer.toJsonObject(this.message).toString());
+		netByteBuf.writeByte(this.position.getCode());
+	}
+}
diff --git a/protocol/src/main/java/mc/protocol/utils/ChatPosition.java b/protocol/src/main/java/mc/protocol/utils/ChatPosition.java
new file mode 100644
index 0000000..3e47244
--- /dev/null
+++ b/protocol/src/main/java/mc/protocol/utils/ChatPosition.java
@@ -0,0 +1,15 @@
+package mc.protocol.utils;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum ChatPosition {
+
+	CHAT(0),
+	SYSTEM(1),
+	HOTBAR(2);
+
+	@Getter
+	private final int code;
+}
diff --git a/server/src/main/java/mc/server/PacketHandler.java b/server/src/main/java/mc/server/PacketHandler.java
index fad97df..f9fe665 100644
--- a/server/src/main/java/mc/server/PacketHandler.java
+++ b/server/src/main/java/mc/server/PacketHandler.java
@@ -7,12 +7,14 @@ import mc.protocol.api.ConnectionContext;
 import mc.protocol.model.Location;
 import mc.protocol.model.Look;
 import mc.protocol.model.ServerInfo;
+import mc.protocol.model.text.Text;
 import mc.protocol.packets.PingPacket;
 import mc.protocol.packets.client.HandshakePacket;
 import mc.protocol.packets.client.LoginStartPacket;
 import mc.protocol.packets.client.StatusServerRequestPacket;
 import mc.protocol.packets.server.*;
 import mc.protocol.serializer.TextSerializer;
+import mc.protocol.utils.ChatPosition;
 import mc.protocol.utils.Difficulty;
 import mc.protocol.utils.GameMode;
 import mc.protocol.utils.LevelType;
@@ -122,6 +124,14 @@ public class PacketHandler {
 		context.send(pingPacket);
 
 		context.flushSending();
+
+		// -- Эксперименты -- //
+
+		var chatPacket = new SChatPacket();
+		chatPacket.setMessage(Text.of("== Hello! =="));
+		chatPacket.setPosition(ChatPosition.CHAT);
+
+		context.sendNow(chatPacket);
 	}
 
 	private static String faviconToBase64(Path iconPath) {