add player to a clientside team removing nametags

src/main/java/me/youhavetrouble/notjustnameplates/NotJustNameplates.java

@@ -1,17 +1,13 @@
 package me.youhavetrouble.notjustnameplates;
 
+import me.youhavetrouble.notjustnameplates.listeners.TeamManagementListener;
 import org.bukkit.plugin.java.JavaPlugin;
 
 public final class NotJustNameplates extends JavaPlugin {
 
     @Override
     public void onEnable() {
-        // Plugin startup logic
-
+        getServer().getPluginManager().registerEvents(new TeamManagementListener(), this);
     }
 
-    @Override
-    public void onDisable() {
-        // Plugin shutdown logic
-    }
 }

src/main/java/me/youhavetrouble/notjustnameplates/listeners/TeamManagementListener.java

@@ -1,6 +1,5 @@
 package me.youhavetrouble.notjustnameplates.listeners;
 
-import me.youhavetrouble.notjustnameplates.teams.PacketTeam;
 import net.minecraft.network.protocol.game.ClientboundSetPlayerTeamPacket;
 import net.minecraft.world.scores.PlayerTeam;
 import net.minecraft.world.scores.Scoreboard;
@@ -11,16 +10,17 @@ import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.HashSet;
 
-public class PlayerJoinLeaveListener implements Listener {
+public class TeamManagementListener implements Listener {
 
     private final Scoreboard scoreboard = new Scoreboard();
     private final PlayerTeam team = new PlayerTeam(scoreboard, "notjustnameplates");
     private final HashSet<String> players = new HashSet<>();
 
-    public PlayerJoinLeaveListener() {
+    public TeamManagementListener() {
         team.setNameTagVisibility(PlayerTeam.Visibility.NEVER);
     }
 
@@ -28,9 +28,10 @@ public class PlayerJoinLeaveListener implements Listener {
     public void onPlayerJoin(PlayerJoinEvent event) {
         Player joiner = event.getPlayer();
         for (Player player : event.getPlayer().getServer().getOnlinePlayers()) {
+            if (player.equals(joiner)) continue;
             addPlayerToTeam(joiner, player);
         }
-        PacketTeam.sendTeamMembers(joiner);
+        sendTeamMembers(joiner);
     }
 
     @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
@@ -41,27 +42,28 @@ public class PlayerJoinLeaveListener implements Listener {
         }
     }
 
-    private void addPlayerToTeam(Player player, Player target) {
+    private void addPlayerToTeam(@NotNull Player player, @NotNull Player target) {
         CraftPlayer craftPlayer = (CraftPlayer) target;
         players.add(player.getName());
-
-        ClientboundSetPlayerTeamPacket teamCreatePacket = ClientboundSetPlayerTeamPacket.createAddOrModifyPacket(team, true);
+        ClientboundSetPlayerTeamPacket teamCreatePacket = ClientboundSetPlayerTeamPacket
+                .createAddOrModifyPacket(team, true);
         craftPlayer.getHandle().connection.send(teamCreatePacket);
-
-        ClientboundSetPlayerTeamPacket packet = ClientboundSetPlayerTeamPacket.createPlayerPacket(team, player.getName(), ClientboundSetPlayerTeamPacket.Action.ADD);
-
+        ClientboundSetPlayerTeamPacket packet = ClientboundSetPlayerTeamPacket
+                .createPlayerPacket(team, player.getName(), ClientboundSetPlayerTeamPacket.Action.ADD);
         craftPlayer.getHandle().connection.send(packet);
     }
 
-    private void removePlayerFromTeam(Player player, Player target) {
-        ClientboundSetPlayerTeamPacket packet = ClientboundSetPlayerTeamPacket.createPlayerPacket(team, player.getName(), ClientboundSetPlayerTeamPacket.Action.REMOVE);
+    private void removePlayerFromTeam(@NotNull Player player, @NotNull Player target) {
+        ClientboundSetPlayerTeamPacket packet = ClientboundSetPlayerTeamPacket
+                .createPlayerPacket(team, player.getName(), ClientboundSetPlayerTeamPacket.Action.REMOVE);
         CraftPlayer craftPlayer = (CraftPlayer) target;
         players.remove(player.getName());
         craftPlayer.getHandle().connection.send(packet);
     }
 
-    private void sendTeamMembers(Player target) {
-        ClientboundSetPlayerTeamPacket packet = ClientboundSetPlayerTeamPacket.createMultiplePlayerPacket(team, players, ClientboundSetPlayerTeamPacket.Action.ADD);
+    private void sendTeamMembers(@NotNull Player target) {
+        ClientboundSetPlayerTeamPacket packet = ClientboundSetPlayerTeamPacket
+                .createMultiplePlayerPacket(team, players, ClientboundSetPlayerTeamPacket.Action.ADD);
         CraftPlayer craftPlayer = (CraftPlayer) target;
         craftPlayer.getHandle().connection.send(packet);
     }

src/main/java/me/youhavetrouble/notjustnameplates/nameplates/Nameplate.java

@@ -1,2 +1,59 @@
-package me.youhavetrouble.notjustnameplates.nameplates;public class Nameplate {
+package me.youhavetrouble.notjustnameplates.nameplates;
+
+import net.kyori.adventure.text.Component;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.UUID;
+
+public class Nameplate {
+
+    private Component name;
+    private final UUID playerUuid;
+    private double heightOffset = 0.5;
+
+    public Nameplate(@NotNull UUID playerUuid, @NotNull Component name) {
+        this.playerUuid = playerUuid;
+        this.name = name;
+    }
+
+    /**
+     * Get content of the nameplate
+     * @return content of the nameplate
+     */
+    public Component getName() {
+        return name;
+    }
+
+    /**
+     * Set content of the nameplate
+     */
+    public void setName(Component name) {
+        this.name = name;
+    }
+
+    /**
+     * Set height offset from the player's eye location
+     */
+    public void setHeightOffset(double heightOffset) {
+        this.heightOffset = heightOffset;
+    }
+
+    /**
+     * Update the nameplate position
+     */
+    public void updatePosition() {
+        Player player = Bukkit.getPlayer(playerUuid);
+        if (player == null) return;
+        Location location = player
+                .getEyeLocation()
+                .clone()
+                .add(0, heightOffset, 0);
+
+        // TODO move fake entity to location
+
+    }
+
 }

src/main/resources/paper-plugin.yml

@@ -1,7 +1,7 @@
 name: NotJustNameplates
 version: '${version}'
 main: me.youhavetrouble.notjustnameplates.NotJustNameplates
-api-version: 1.20
-authors: [YouHaveTrouble]
+api-version: "1.20"
+authors: ["YouHaveTrouble"]
 description: Nameplates using display entities
 website: https://youhavetrouble.me