Fix the chat history not correctly showing.

src/main/java/emu/grasscutter/game/managers/chat/ChatManager.java

 package emu.grasscutter.game.managers.chat;
 
+import emu.grasscutter.GameConstants;
 import emu.grasscutter.command.CommandMap;
 import emu.grasscutter.game.player.Player;
-import emu.grasscutter.net.packet.BasePacket;
+import emu.grasscutter.net.proto.ChatInfoOuterClass.ChatInfo;
 import emu.grasscutter.server.game.GameServer;
 import emu.grasscutter.server.packet.send.PacketPlayerChatNotify;
 import emu.grasscutter.server.packet.send.PacketPrivateChatNotify;
+import emu.grasscutter.server.packet.send.PacketPullPrivateChatRsp;
+import emu.grasscutter.server.packet.send.PacketPullRecentChatRsp;
+import emu.grasscutter.utils.Utils;
 
 import java.util.regex.Pattern;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static emu.grasscutter.Configuration.*;
 
 public class ChatManager implements ChatManagerHandler {
 	static final String PREFIXES = "[/!]";
 	static final Pattern RE_PREFIXES = Pattern.compile(PREFIXES);
 	static final Pattern RE_COMMANDS = Pattern.compile("\n" + PREFIXES);
 
+	// We store the chat history for ongoing sessions in the form
+	//    user id -> chat partner id -> [messages]
+	private final Map<Integer, Map<Integer, List<ChatInfo>>> history = new HashMap<>();
+
 	private final GameServer server;
 
 	public ChatManager(GameServer server) {
@@ -32,13 +46,93 @@ public class ChatManager implements ChatManagerHandler {
 		return true;
 	}
 
-	public void sendPrivateMessage(Player player, int targetUid, String message) {
-		// Sanity checks
+	/********************
+	 * Chat history handling
+	 ********************/
+	private void putInHistory(int uid, int targetId, ChatInfo info) {
+		if (!this.history.containsKey(uid)) {
+			this.history.put(uid, new HashMap<>());
+		}
+		if (!this.history.get(uid).containsKey(targetId)) {
+			this.history.get(uid).put(targetId, new ArrayList<>());
+		}
+
+		this.history.get(uid).get(targetId).add(info);
+	}
+
+	public void clearHistoryOnLogout(Player player) {
+		if (this.history.containsKey(player.getUid())) {
+			this.history.remove(player.getUid());
+		}
+	}
+
+	public void handlePullPrivateChatReq(Player player, int targetUid) {
+		if (this.history.containsKey(player.getUid()) && this.history.get(player.getUid()).containsKey(targetUid)) {
+			player.sendPacket(new PacketPullPrivateChatRsp(this.history.get(player.getUid()).get(targetUid)));
+		}
+		else {
+			player.sendPacket(new PacketPullPrivateChatRsp(List.of()));
+		}
+	}
+
+	public void handlePullRecentChatReq(Player player) {
+		// For now, we send the list three messages from the server for the recent chat history.
+		// This matches the previous behavior, but ultimately, we should probably keep track of the last chat partner
+		// for every given player and return the last messages exchanged with that partner.
+		if (this.history.containsKey(player.getUid()) && this.history.get(player.getUid()).containsKey(GameConstants.SERVER_CONSOLE_UID)) {
+			int historyLength = this.history.get(player.getUid()).get(GameConstants.SERVER_CONSOLE_UID).size();
+			var messages = this.history.get(player.getUid()).get(GameConstants.SERVER_CONSOLE_UID).subList(Math.max(historyLength - 3, 0), historyLength);
+			player.sendPacket(new PacketPullRecentChatRsp(messages));
+		}
+		else {
+			player.sendPacket(new PacketPullRecentChatRsp(List.of()));
+		}
+	}
+
+	/********************
+	 * Sending messages
+	 ********************/
+	public void sendPrivateMessageFromServer(int targetUid, String message) {
+		// Sanity checks.
 		if (message == null || message.length() == 0) {
 			return;
 		}
+		
+		// Get target.
+		Player target = getServer().getPlayerByUid(targetUid);
+		if (target == null) {
+			return;
+		}
+
+		// Create chat packet and put in history.
+		var packet = new PacketPrivateChatNotify(GameConstants.SERVER_CONSOLE_UID, targetUid, message);
+		putInHistory(targetUid, GameConstants.SERVER_CONSOLE_UID, packet.getChatInfo());
+
+		// Send.
+		target.sendPacket(packet);
+	}
+	public void sendPrivateMessageFromServer(int targetUid, int emote) {
+		// Get target.
+		Player target = getServer().getPlayerByUid(targetUid);
+		if (target == null) {
+			return;
+		}
+
+		// Create chat packet and put in history.
+		var packet = new PacketPrivateChatNotify(GameConstants.SERVER_CONSOLE_UID, targetUid, emote);
+		putInHistory(targetUid, GameConstants.SERVER_CONSOLE_UID, packet.getChatInfo());
+
+		// Send.
+		target.sendPacket(packet);
+	}
 
-		// Get target
+	public void sendPrivateMessage(Player player, int targetUid, String message) {
+		// Sanity checks.
+		if (message == null || message.length() == 0) {
+			return;
+		}
+		
+		// Get target.
 		Player target = getServer().getPlayerByUid(targetUid);
 
 		// Check if command
@@ -46,30 +140,42 @@ public class ChatManager implements ChatManagerHandler {
 			return;
 		}
 
-		if (target == null) {
+		if (target == null && targetUid != GameConstants.SERVER_CONSOLE_UID) {
 			return;
 		}
 
-		// Create chat packet
-		BasePacket packet = new PacketPrivateChatNotify(player.getUid(), target.getUid(), message);
+		// Create chat packet.
+		var packet = new PacketPrivateChatNotify(player.getUid(), targetUid, message);
 
+		// Send and put in history.
 		player.sendPacket(packet);
-		target.sendPacket(packet);
+		putInHistory(player.getUid(), targetUid, packet.getChatInfo());
+
+		if (target != null) {
+			target.sendPacket(packet);
+			putInHistory(targetUid, player.getUid(), packet.getChatInfo());
+		}
 	}
 
 	public void sendPrivateMessage(Player player, int targetUid, int emote) {
-		// Get target
+		// Get target.
 		Player target = getServer().getPlayerByUid(targetUid);
-
-		if (target == null) {
+		
+		if (target == null && targetUid != GameConstants.SERVER_CONSOLE_UID) {
 			return;
 		}
+		
+		// Create chat packet.
+		var packet = new PacketPrivateChatNotify(player.getUid(), target.getUid(), emote);
 
-		// Create chat packet
-		BasePacket packet = new PacketPrivateChatNotify(player.getUid(), target.getUid(), emote);
-
+		// Send and put is history.
 		player.sendPacket(packet);
-		target.sendPacket(packet);
+		putInHistory(player.getUid(), targetUid, packet.getChatInfo());
+
+		if (target != null) {
+			target.sendPacket(packet);
+			putInHistory(targetUid, player.getUid(), packet.getChatInfo());
+		}
 	}
 
 	public void sendTeamMessage(Player player, int channel, String message) {
@@ -86,9 +192,25 @@ public class ChatManager implements ChatManagerHandler {
 		// Create and send chat packet
 		player.getWorld().broadcastPacket(new PacketPlayerChatNotify(player, channel, message));
 	}
-
 	public void sendTeamMessage(Player player, int channel, int icon) {
 		// Create and send chat packet
 		player.getWorld().broadcastPacket(new PacketPlayerChatNotify(player, channel, icon));
 	}
+
+	/********************
+	 * Welcome messages
+	 ********************/
+	public void sendServerWelcomeMessages(Player player) {
+		var joinOptions = GAME_INFO.joinOptions;
+		
+		if (joinOptions.welcomeEmotes != null && joinOptions.welcomeEmotes.length > 0) {
+			this.sendPrivateMessageFromServer(player.getUid(), joinOptions.welcomeEmotes[Utils.randomRange(0, joinOptions.welcomeEmotes.length - 1)]);
+		}
+		
+		if (joinOptions.welcomeMessage != null && joinOptions.welcomeMessage.length() > 0) {
+			this.sendPrivateMessageFromServer(player.getUid(), joinOptions.welcomeMessage);
+		}
+
+		this.sendPrivateMessageFromServer(player.getUid(), "THIS IS AN EXPERIMENTAL BUILD OF GRASSCUTTER FOR 2.7.50/2.8\nDON'T LEAK <3");
+	}
 }

src/main/java/emu/grasscutter/game/managers/chat/ChatManagerHandler.java

@@ -9,4 +9,10 @@ public interface ChatManagerHandler {
     void sendPrivateMessage(Player player, int targetUid, int emote);
     void sendTeamMessage(Player player, int channel, String message);
     void sendTeamMessage(Player player, int channel, int icon);
+    void sendPrivateMessageFromServer(int targetUid, String message);
+    void sendPrivateMessageFromServer(int targetUid, int emote);
+    void handlePullPrivateChatReq(Player player, int targetUid);
+    void clearHistoryOnLogout(Player player);
+    void sendServerWelcomeMessages(Player player);
+    void handlePullRecentChatReq(Player player);
 }

src/main/java/emu/grasscutter/game/player/Player.java

@@ -1052,7 +1052,9 @@ public class Player {
 			this.messageHandler.append(message.toString());
 			return;
 		}
-		this.sendPacket(new PacketPrivateChatNotify(GameConstants.SERVER_CONSOLE_UID, getUid(), message.toString()));
+
+		this.getServer().getChatManager().sendPrivateMessageFromServer(getUid(), message.toString());
+		// this.sendPacket(new PacketPrivateChatNotify(GameConstants.SERVER_CONSOLE_UID, getUid(), message.toString()));
 	}
 
 	/**
@@ -1062,7 +1064,8 @@ public class Player {
 	 * @param message The message to send.
 	 */
 	public void sendMessage(Player sender, Object message) {
-		this.sendPacket(new PacketPrivateChatNotify(sender.getUid(), this.getUid(), message.toString()));
+		// this.sendPacket(new PacketPrivateChatNotify(sender.getUid(), this.getUid(), message.toString()));
+		this.getServer().getChatManager().sendPrivateMessage(sender, this.getUid(), message.toString());
 	}
 
 	// ---------------------MAIL------------------------
@@ -1541,6 +1544,9 @@ public class Player {
 		// First notify packets sent
 		this.setHasSentAvatarDataNotify(true);
 
+		// Send server welcome chat.
+		this.getServer().getChatManager().sendServerWelcomeMessages(this);
+		
 		// Set session state
 		session.setState(SessionState.ACTIVE);
 
@@ -1558,6 +1564,9 @@ public class Player {
 
 	public void onLogout() {
 		try{
+			// Clear chat history.
+			this.getServer().getChatManager().clearHistoryOnLogout(this);
+
 			// stop stamina calculation
 			getStaminaManager().stopSustainedStaminaHandler();
 

src/main/java/emu/grasscutter/server/packet/recv/HandlerPullPrivateChatReq.java

@@ -13,8 +13,10 @@ public class HandlerPullPrivateChatReq extends PacketHandler {
 	@Override
 	public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
 		PullPrivateChatReq req = PullPrivateChatReq.parseFrom(payload);
+
+		session.getServer().getChatManager().handlePullPrivateChatReq(session.getPlayer(), req.getTargetUid());
 		
-		session.send(new PacketPullPrivateChatRsp());
+		// session.send(new PacketPullPrivateChatRsp(req.getTargetUid()));
 	}
 
 }

src/main/java/emu/grasscutter/server/packet/recv/HandlerPullRecentChatReq.java

@@ -10,6 +10,6 @@ import emu.grasscutter.server.packet.send.PacketPullRecentChatRsp;
 public class HandlerPullRecentChatReq extends PacketHandler {
 	@Override
 	public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
-		session.send(new PacketPullRecentChatRsp(session.getPlayer()));
+		session.getServer().getChatManager().handlePullRecentChatReq(session.getPlayer());
 	}
 }

src/main/java/emu/grasscutter/server/packet/send/PacketPrivateChatNotify.java

@@ -6,6 +6,8 @@ import emu.grasscutter.net.proto.ChatInfoOuterClass.ChatInfo;
 import emu.grasscutter.net.proto.PrivateChatNotifyOuterClass.PrivateChatNotify;
 
 public class PacketPrivateChatNotify extends BasePacket {
+	private ChatInfo info;
+
 	public PacketPrivateChatNotify(int senderId, int recvId, String message) {
 		super(PacketOpcodes.PrivateChatNotify);
 		
@@ -15,7 +17,8 @@ public class PacketPrivateChatNotify extends BasePacket {
 				.setToUid(recvId)
 				.setText(message)
 				.build();
-		
+		this.info = info;
+
 		PrivateChatNotify proto = PrivateChatNotify.newBuilder()
 				.setChatInfo(info)
 				.build();
@@ -32,6 +35,7 @@ public class PacketPrivateChatNotify extends BasePacket {
 				.setToUid(recvId)
 				.setIcon(emote)
 				.build();
+		this.info = info;
 		
 		PrivateChatNotify proto = PrivateChatNotify.newBuilder()
 				.setChatInfo(info)
@@ -39,4 +43,8 @@ public class PacketPrivateChatNotify extends BasePacket {
 		
 		this.setData(proto);
 	}
+
+	public ChatInfo getChatInfo() {
+		return this.info;
+	}
 }

src/main/java/emu/grasscutter/server/packet/send/PacketPullPrivateChatRsp.java

 package emu.grasscutter.server.packet.send;
 
+import java.util.List;
+
 import emu.grasscutter.net.packet.BasePacket;
 import emu.grasscutter.net.packet.PacketOpcodes;
+import emu.grasscutter.net.proto.ChatInfoOuterClass.ChatInfo;
 import emu.grasscutter.net.proto.PullPrivateChatRspOuterClass.PullPrivateChatRsp;
+import emu.grasscutter.net.proto.RetcodeOuterClass.Retcode;
 
 public class PacketPullPrivateChatRsp extends BasePacket {
 	
-	public PacketPullPrivateChatRsp() {
+	public PacketPullPrivateChatRsp(List<ChatInfo> history) {
 		super(PacketOpcodes.PullPrivateChatRsp);
 
-		PullPrivateChatRsp proto = PullPrivateChatRsp.newBuilder().build();
+		PullPrivateChatRsp.Builder builder = PullPrivateChatRsp.newBuilder();
+
+		if (history == null) {
+			builder.setRetcode(Retcode.RET_FAIL_VALUE);
+		}
+		else {
+			for (var info : history) {
+				builder.addChatInfo(info);
+			}
+		}
 		
-		this.setData(proto);
+		this.setData(builder.build());
 	}
 }

src/main/java/emu/grasscutter/server/packet/send/PacketPullRecentChatRsp.java

@@ -10,33 +10,14 @@ import emu.grasscutter.utils.Utils;
 
 import static emu.grasscutter.Configuration.*;
 
+import java.util.List;
+
 public class PacketPullRecentChatRsp extends BasePacket {
-	public PacketPullRecentChatRsp(Player player) {
+	public PacketPullRecentChatRsp(List<ChatInfo> messages) {
 		super(PacketOpcodes.PullRecentChatRsp);
 		
-		var joinOptions = GAME_INFO.joinOptions;
-		PullRecentChatRsp.Builder proto = PullRecentChatRsp.newBuilder();
-		
-		if (joinOptions.welcomeEmotes != null && joinOptions.welcomeEmotes.length > 0) {
-			ChatInfo welcomeEmote = ChatInfo.newBuilder()
-				.setTime((int) (System.currentTimeMillis() / 1000))
-				.setUid(GameConstants.SERVER_CONSOLE_UID)
-				.setToUid(player.getUid())
-				.setIcon(joinOptions.welcomeEmotes[Utils.randomRange(0, joinOptions.welcomeEmotes.length - 1)])
-				.build();
-			
-			proto.addChatInfo(welcomeEmote);
-		}
-		
-		if (joinOptions.welcomeMessage != null && joinOptions.welcomeMessage.length() > 0) {
-			ChatInfo welcomeMessage = ChatInfo.newBuilder()
-				.setTime((int) (System.currentTimeMillis() / 1000))
-				.setUid(GameConstants.SERVER_CONSOLE_UID)
-				.setToUid(player.getUid())
-				.setText(joinOptions.welcomeMessage)
-				.build();
-			proto.addChatInfo(welcomeMessage);
-		}
+		PullRecentChatRsp.Builder proto = PullRecentChatRsp.newBuilder()
+			.addAllChatInfo(messages);
 
 		this.setData(proto);
 	}