FakeEntity化

build.gradle.kts

@@ -7,6 +7,7 @@ plugins {
     kotlin("jvm") version "2.2.21"
     id("de.eldoria.plugin-yml.paper") version "0.8.0"
     id("com.gradleup.shadow") version "9.2.2"
+    id("io.papermc.paperweight.userdev") version "2.0.0-beta.19"
 }
 repositories {
     mavenCentral()
@@ -16,7 +17,7 @@ repositories {
 
 dependencies {
     compileOnly("me.clip:placeholderapi:2.11.6")
-    compileOnly("io.papermc.paper:paper-api:1.21.10-R0.1-SNAPSHOT")
+    paperweight.paperDevBundle("1.21.11-R0.1-SNAPSHOT")
     compileOnly("org.jetbrains.kotlin:kotlin-stdlib:2.1.0")
     implementation("net.hareworks:kommand-lib:1.1")
     implementation("net.hareworks:permits-lib:1.1")
@@ -62,4 +63,7 @@ tasks {
             exclude(dependency("org.jetbrains.kotlin:kotlin-stdlib-jdk7"))
         }
     }
+    assemble {
+        dependsOn(reobfJar)
+    }
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

settings.gradle.kts

@@ -1,3 +1,10 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        maven("https://repo.papermc.io/repository/maven-public/")
+    }
+}
+
 rootProject.name = "GhostDisplays"
 
 includeBuild("kommand-lib")

src/main/kotlin/net/hareworks/ghostdisplays/GhostDisplaysPlugin.kt

@@ -24,6 +24,7 @@ class GhostDisplaysPlugin : JavaPlugin() {
         miniMessage = MiniMessage.miniMessage()
         displayRegistry = DisplayRegistry().also {
             server.pluginManager.registerEvents(it, this)
+            it.initialize(this)
         }
         serviceImpl = DefaultDisplayService(this, displayRegistry)
         displayManager = DisplayManager(this, serviceImpl, miniMessage)

src/main/kotlin/net/hareworks/ghostdisplays/api/DisplayController.kt

@@ -5,49 +5,35 @@ import net.hareworks.ghostdisplays.api.audience.AudiencePredicate
 import net.hareworks.ghostdisplays.api.click.ClickPriority
 import net.hareworks.ghostdisplays.api.click.DisplayClickHandler
 import net.hareworks.ghostdisplays.api.click.HandlerRegistration
-import org.bukkit.entity.Display
+import net.hareworks.ghostdisplays.internal.fake.FakeBlockDisplay
-import org.bukkit.entity.Interaction
+import net.hareworks.ghostdisplays.internal.fake.FakeDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeItemDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeTextDisplay
+import org.bukkit.Location
 import org.bukkit.entity.Player
 import java.util.UUID
 
-interface DisplayController<T : Display> {
+interface DisplayController {
-    val display: T
+    val entityId: Int
-    val interaction: Interaction?
+    val displayType: DisplayType
+    val location: Location
 
     fun show(player: Player)
-
     fun hide(player: Player)
-
     fun isViewing(playerId: UUID): Boolean
-
     fun viewerIds(): Set<UUID>
 
-    fun applyEntityUpdate(mutator: (T) -> Unit)
+    fun updateText(mutator: (FakeTextDisplay) -> Unit)
+    fun updateBlock(mutator: (FakeBlockDisplay) -> Unit)
+    fun updateItem(mutator: (FakeItemDisplay) -> Unit)
+    fun updateDisplay(mutator: (FakeDisplay) -> Unit)
+    fun teleport(location: Location)
 
-    /**
-     * Displayの基本可視状態を設定します。
-     * ルールにマッチしなかった場合のデフォルトの振る舞いとなります。
-     */
     fun setBaseVisibility(visible: Boolean)
-
-    /**
-     * 従来の簡易メソッド。Action=ADD として登録します。
-     */
     fun addAudience(predicate: AudiencePredicate): HandlerRegistration
-
-    /**
-     * ルールを追加します。評価順序は追加順です。
-     */
     fun addAudienceRule(predicate: AudiencePredicate, action: AudienceAction): HandlerRegistration
-
     fun clearAudienceRules()
-
     fun refreshAudience(target: Player? = null)
-
-    /**
-     * 定期的な更新チェックが必要かどうかを返します。
-     * trueの場合、サーバーのtick毎（または定期タスク）にrefreshAudienceが呼び出されます。
-     */
     fun needsPeriodicUpdate(): Boolean = false
 
     fun destroy()

src/main/kotlin/net/hareworks/ghostdisplays/api/DisplayService.kt

@@ -1,30 +1,30 @@
 package net.hareworks.ghostdisplays.api
 
+import net.hareworks.ghostdisplays.internal.fake.FakeBlockDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeItemDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeTextDisplay
 import org.bukkit.Location
-import org.bukkit.entity.BlockDisplay
-import org.bukkit.entity.ItemDisplay
-import org.bukkit.entity.TextDisplay
 import org.bukkit.inventory.ItemStack
 
 interface DisplayService {
     fun createTextDisplay(
         location: Location,
         interaction: InteractionOptions = InteractionOptions.Disabled,
-        builder: TextDisplay.() -> Unit = {}
+        builder: FakeTextDisplay.() -> Unit = {}
-    ): DisplayController<TextDisplay>
+    ): DisplayController
 
     fun createBlockDisplay(
         location: Location,
         interaction: InteractionOptions = InteractionOptions.Disabled,
-        builder: BlockDisplay.() -> Unit = {}
+        builder: FakeBlockDisplay.() -> Unit = {}
-    ): DisplayController<BlockDisplay>
+    ): DisplayController
 
     fun createItemDisplay(
         location: Location,
         itemStack: ItemStack,
         interaction: InteractionOptions = InteractionOptions.Disabled,
-        builder: ItemDisplay.() -> Unit = {}
+        builder: FakeItemDisplay.() -> Unit = {}
-    ): DisplayController<ItemDisplay>
+    ): DisplayController
 
     fun destroyAll()
 }

src/main/kotlin/net/hareworks/ghostdisplays/api/DisplayType.kt

@@ -0,0 +1,7 @@
+package net.hareworks.ghostdisplays.api
+
+enum class DisplayType {
+    TEXT,
+    BLOCK,
+    ITEM
+}

src/main/kotlin/net/hareworks/ghostdisplays/api/click/DisplayClick.kt

@@ -1,9 +1,7 @@
 package net.hareworks.ghostdisplays.api.click
 
 import net.hareworks.ghostdisplays.api.DisplayController
-import org.bukkit.entity.Entity
 import org.bukkit.entity.Player
-import org.bukkit.event.player.PlayerInteractEntityEvent
 import org.bukkit.inventory.EquipmentSlot
 
 enum class ClickPriority {
@@ -20,10 +18,10 @@ enum class ClickSurface {
 data class DisplayClickContext(
     val player: Player,
     val hand: EquipmentSlot?,
-    val clickedEntity: Entity,
+    val entityId: Int,
     val surface: ClickSurface,
-    val controller: DisplayController<*>,
+    val controller: DisplayController,
-    val event: PlayerInteractEntityEvent
+    var cancelled: Boolean = false
 )
 
 fun interface DisplayClickHandler {

src/main/kotlin/net/hareworks/ghostdisplays/display/DisplayManager.kt

@@ -8,18 +8,13 @@ import net.hareworks.ghostdisplays.api.DisplayService
 import net.hareworks.ghostdisplays.api.InteractionOptions
 import net.hareworks.ghostdisplays.api.audience.AudienceAction
 import net.hareworks.ghostdisplays.api.audience.AudiencePredicates
-import net.hareworks.ghostdisplays.display.DisplayManager.DisplayOperationException
 import net.kyori.adventure.text.Component
 import net.kyori.adventure.text.minimessage.MiniMessage
 import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer
 import org.bukkit.Bukkit
 import org.bukkit.Location
 import org.bukkit.block.data.BlockData
-import org.bukkit.entity.BlockDisplay
-import org.bukkit.entity.Display
-import org.bukkit.entity.ItemDisplay
 import org.bukkit.entity.Player
-import org.bukkit.entity.TextDisplay
 import org.bukkit.inventory.ItemStack
 import org.bukkit.plugin.java.JavaPlugin
 
@@ -28,7 +23,7 @@ class DisplayManager(
     private val service: DisplayService,
     private val miniMessage: MiniMessage
 ) {
-    private val displays = ConcurrentHashMap<String, ManagedDisplay<*>>()
+    private val displays = ConcurrentHashMap<String, ManagedDisplay>()
     private val idPattern = Regex("^[a-z0-9_\\-]{1,32}$")
     private val logger: Logger = plugin.logger
     private val plainSerializer = PlainTextComponentSerializer.plainText()
@@ -39,9 +34,7 @@ class DisplayManager(
         val safeLocation = location.clone()
         val controller = service.createTextDisplay(safeLocation, INTERACTION_DEFAULT)
         val component = parseMiniMessage(initialContent.ifBlank { "<gray>${normalized}" }, creator)
-        controller.applyEntityUpdate { textDisplay ->
+        controller.updateText { it.text = component }
-            textDisplay.text(component)
-        }
         val managed = ManagedDisplay.Text(
             id = normalized,
             controller = controller,
@@ -61,7 +54,7 @@ class DisplayManager(
         ensureIdAvailable(normalized)
         val safeLocation = location.clone()
         val controller = service.createBlockDisplay(safeLocation, INTERACTION_DEFAULT)
-        controller.applyEntityUpdate { it.block = blockData.clone() }
+        controller.updateBlock { it.blockData = blockData.clone() }
         val managed = ManagedDisplay.Block(
             id = normalized,
             controller = controller,
@@ -80,7 +73,6 @@ class DisplayManager(
         ensureIdAvailable(normalized)
         val safeLocation = location.clone()
         val controller = service.createItemDisplay(safeLocation, itemStack.clone(), INTERACTION_DEFAULT)
-        controller.applyEntityUpdate { it.setItemStack(itemStack.clone()) }
         val managed = ManagedDisplay.Item(
             id = normalized,
             controller = controller,
@@ -94,14 +86,14 @@ class DisplayManager(
         return managed
     }
 
-    fun listDisplays(): List<ManagedDisplay<*>> = displays.values.sortedBy { it.id }
+    fun listDisplays(): List<ManagedDisplay> = displays.values.sortedBy { it.id }
 
-    fun findDisplay(id: String): ManagedDisplay<*>? = displays[normalizeId(id)]
+    fun findDisplay(id: String): ManagedDisplay? = displays[normalizeId(id)]
 
     fun updateText(id: String, content: String, playerContext: Player? = null): Component {
         val display = requireText(id)
         val component = parseMiniMessage(content, playerContext)
-        display.controller.applyEntityUpdate { it.text(component) }
+        display.controller.updateText { it.text = component }
         display.rawContent = content
         display.component = component
         return component
@@ -109,14 +101,14 @@ class DisplayManager(
 
     fun updateBlock(id: String, blockData: BlockData) {
         val display = requireBlock(id)
-        display.controller.applyEntityUpdate { it.block = blockData.clone() }
+        display.controller.updateBlock { it.blockData = blockData.clone() }
         display.blockData = blockData.clone()
     }
 
     fun updateItem(id: String, itemStack: ItemStack) {
         val display = requireItem(id)
         val clone = itemStack.clone()
-        display.controller.applyEntityUpdate { it.setItemStack(clone) }
+        display.controller.updateItem { it.itemStack = clone }
         display.itemStack = clone
     }
 
@@ -219,14 +211,14 @@ class DisplayManager(
         displays.clear()
     }
 
-    fun describeContent(display: ManagedDisplay<*>): String =
+    fun describeContent(display: ManagedDisplay): String =
         when (display) {
             is ManagedDisplay.Text -> plainSerializer.serialize(display.component)
             is ManagedDisplay.Block -> display.blockData.asString
             is ManagedDisplay.Item -> display.itemStack.type.name.lowercase()
         }
 
-    private fun requireDisplay(id: String): ManagedDisplay<*> =
+    private fun requireDisplay(id: String): ManagedDisplay =
         displays[normalizeId(id)] ?: throw DisplayOperationException("Display '$id' does not exist.")
 
     private fun requireText(id: String): ManagedDisplay.Text =

src/main/kotlin/net/hareworks/ghostdisplays/display/ManagedDisplay.kt

@@ -8,10 +8,6 @@ import net.hareworks.ghostdisplays.api.click.HandlerRegistration
 import net.kyori.adventure.text.Component
 import org.bukkit.Location
 import org.bukkit.block.data.BlockData
-import org.bukkit.entity.BlockDisplay
-import org.bukkit.entity.Display
-import org.bukkit.entity.ItemDisplay
-import org.bukkit.entity.TextDisplay
 import org.bukkit.inventory.ItemStack
 
 enum class DisplayKind {
@@ -30,10 +26,10 @@ data class AudienceBinding(
     }
 }
 
-sealed class ManagedDisplay<T : Display>(
+sealed class ManagedDisplay(
     val id: String,
     val kind: DisplayKind,
-    val controller: DisplayController<T>,
+    val controller: DisplayController,
     location: Location,
     val createdAt: Instant,
     val createdBy: UUID?
@@ -61,29 +57,29 @@ sealed class ManagedDisplay<T : Display>(
 
     class Text(
         id: String,
-        controller: DisplayController<TextDisplay>,
+        controller: DisplayController,
         location: Location,
         createdAt: Instant,
         createdBy: UUID?,
         var rawContent: String,
         var component: Component
-    ) : ManagedDisplay<TextDisplay>(id, DisplayKind.TEXT, controller, location, createdAt, createdBy)
+    ) : ManagedDisplay(id, DisplayKind.TEXT, controller, location, createdAt, createdBy)
 
     class Block(
         id: String,
-        controller: DisplayController<BlockDisplay>,
+        controller: DisplayController,
         location: Location,
         createdAt: Instant,
         createdBy: UUID?,
         var blockData: BlockData
-    ) : ManagedDisplay<BlockDisplay>(id, DisplayKind.BLOCK, controller, location, createdAt, createdBy)
+    ) : ManagedDisplay(id, DisplayKind.BLOCK, controller, location, createdAt, createdBy)
 
     class Item(
         id: String,
-        controller: DisplayController<ItemDisplay>,
+        controller: DisplayController,
         location: Location,
         createdAt: Instant,
         createdBy: UUID?,
         var itemStack: ItemStack
-    ) : ManagedDisplay<ItemDisplay>(id, DisplayKind.ITEM, controller, location, createdAt, createdBy)
+    ) : ManagedDisplay(id, DisplayKind.ITEM, controller, location, createdAt, createdBy)
 }

src/main/kotlin/net/hareworks/ghostdisplays/internal/DefaultDisplayService.kt

@@ -1,19 +1,18 @@
 package net.hareworks.ghostdisplays.internal
 
-import java.util.concurrent.CompletableFuture
+import java.util.UUID
 import java.util.concurrent.CopyOnWriteArraySet
 import net.hareworks.ghostdisplays.api.DisplayController
 import net.hareworks.ghostdisplays.api.DisplayService
 import net.hareworks.ghostdisplays.api.InteractionOptions
 import net.hareworks.ghostdisplays.internal.controller.BaseDisplayController
 import net.hareworks.ghostdisplays.internal.controller.DisplayRegistry
-import org.bukkit.Bukkit
+import net.hareworks.ghostdisplays.internal.fake.FakeBlockDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeInteraction
+import net.hareworks.ghostdisplays.internal.fake.FakeItemDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeTextDisplay
+import net.hareworks.ghostdisplays.internal.nms.DisplayPacketFactory
 import org.bukkit.Location
-import org.bukkit.entity.BlockDisplay
-import org.bukkit.entity.Display
-import org.bukkit.entity.Interaction
-import org.bukkit.entity.ItemDisplay
-import org.bukkit.entity.TextDisplay
 import org.bukkit.inventory.ItemStack
 import org.bukkit.plugin.java.JavaPlugin
 
@@ -21,32 +20,50 @@ internal class DefaultDisplayService(
     private val plugin: JavaPlugin,
     private val registry: DisplayRegistry
 ) : DisplayService {
-    private val controllers = CopyOnWriteArraySet<BaseDisplayController<out Display>>()
+    private val controllers = CopyOnWriteArraySet<BaseDisplayController>()
 
     override fun createTextDisplay(
         location: Location,
         interaction: InteractionOptions,
-        builder: TextDisplay.() -> Unit
+        builder: FakeTextDisplay.() -> Unit
-    ): DisplayController<TextDisplay> = spawnDisplay(location, TextDisplay::class.java, interaction) {
+    ): DisplayController {
-        builder(it)
+        val fake = FakeTextDisplay(
+            entityId = DisplayPacketFactory.nextEntityId(),
+            uuid = UUID.randomUUID(),
+            location = location.clone()
+        )
+        builder(fake)
+        return register(fake, location, interaction)
     }
 
     override fun createBlockDisplay(
         location: Location,
         interaction: InteractionOptions,
-        builder: BlockDisplay.() -> Unit
+        builder: FakeBlockDisplay.() -> Unit
-    ): DisplayController<BlockDisplay> = spawnDisplay(location, BlockDisplay::class.java, interaction) {
+    ): DisplayController {
-        builder(it)
+        val fake = FakeBlockDisplay(
+            entityId = DisplayPacketFactory.nextEntityId(),
+            uuid = UUID.randomUUID(),
+            location = location.clone()
+        )
+        builder(fake)
+        return register(fake, location, interaction)
     }
 
     override fun createItemDisplay(
         location: Location,
         itemStack: ItemStack,
         interaction: InteractionOptions,
-        builder: ItemDisplay.() -> Unit
+        builder: FakeItemDisplay.() -> Unit
-    ): DisplayController<ItemDisplay> = spawnDisplay(location, ItemDisplay::class.java, interaction) {
+    ): DisplayController {
-        it.setItemStack(itemStack.clone())
+        val fake = FakeItemDisplay(
-        builder(it)
+            entityId = DisplayPacketFactory.nextEntityId(),
+            uuid = UUID.randomUUID(),
+            location = location.clone()
+        )
+        fake.itemStack = itemStack.clone()
+        builder(fake)
+        return register(fake, location, interaction)
     }
 
     override fun destroyAll() {
@@ -54,50 +71,25 @@ internal class DefaultDisplayService(
         controllers.clear()
     }
 
-    private fun <T : Display> spawnDisplay(
+    private fun register(
+        fake: net.hareworks.ghostdisplays.internal.fake.FakeDisplay,
         location: Location,
-        type: Class<T>,
+        interactionOptions: InteractionOptions
-        interactionOptions: InteractionOptions,
+    ): DisplayController {
-        afterSpawn: (T) -> Unit
+        val fakeInteraction = if (interactionOptions.enabled) {
-    ): DisplayController<T> {
+            FakeInteraction(
-        val entity = callSync(location) {
+                entityId = DisplayPacketFactory.nextEntityId(),
-            val world = location.world ?: throw IllegalArgumentException("Location must have a world")
+                uuid = UUID.randomUUID(),
-            world.spawn(location, type) { spawned ->
+                location = location.clone()
-                spawned.setPersistent(false)
+            ).apply {
-                spawned.setVisibleByDefault(false)
+                width = interactionOptions.effectiveWidth().toFloat()
+                height = interactionOptions.effectiveHeight().toFloat()
+                responsive = interactionOptions.responsive
             }
-        }
+        } else null
-        callSync(location) { afterSpawn(entity) }
+        val controller = BaseDisplayController(plugin, fake, fakeInteraction, registry)
-        val interaction = if (interactionOptions.enabled) spawnInteraction(location, interactionOptions) else null
-        val controller = BaseDisplayController(plugin, entity, interaction, registry)
         controllers += controller
         registry.register(controller)
         return controller
     }
-
-    private fun spawnInteraction(location: Location, options: InteractionOptions): Interaction =
-        callSync(location) {
-            val world = location.world ?: throw IllegalArgumentException("Location must have a world")
-            world.spawn(location, Interaction::class.java) { interaction ->
-                interaction.setPersistent(false)
-                interaction.setInvisible(true)
-                interaction.setVisibleByDefault(false)
-                interaction.setResponsive(options.responsive)
-                interaction.setInteractionWidth(options.effectiveWidth().toFloat())
-                interaction.setInteractionHeight(options.effectiveHeight().toFloat())
-            }
-        }
-
-    private fun <T> callSync(location: Location, action: () -> T): T {
-        val world = location.world ?: throw IllegalArgumentException("Location has no world")
-        val chunkX = location.blockX shr 4
-        val chunkZ = location.blockZ shr 4
-        return if (Bukkit.isOwnedByCurrentRegion(world, chunkX, chunkZ)) {
-            action()
-        } else {
-            val future = CompletableFuture<T>()
-            plugin.server.regionScheduler.run(plugin, location) { _ -> future.complete(action()) }
-            future.join()
-        }
-    }
 }

src/main/kotlin/net/hareworks/ghostdisplays/internal/controller/BaseDisplayController.kt

@@ -2,11 +2,11 @@ package net.hareworks.ghostdisplays.internal.controller
 
 import java.util.HashSet
 import java.util.UUID
-import java.util.concurrent.CompletableFuture
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.CopyOnWriteArrayList
 import java.util.concurrent.atomic.AtomicBoolean
 import net.hareworks.ghostdisplays.api.DisplayController
+import net.hareworks.ghostdisplays.api.DisplayType
 import net.hareworks.ghostdisplays.api.audience.AudienceAction
 import net.hareworks.ghostdisplays.api.audience.AudiencePredicate
 import net.hareworks.ghostdisplays.api.click.ClickPriority
@@ -14,57 +14,69 @@ import net.hareworks.ghostdisplays.api.click.ClickSurface
 import net.hareworks.ghostdisplays.api.click.DisplayClickContext
 import net.hareworks.ghostdisplays.api.click.DisplayClickHandler
 import net.hareworks.ghostdisplays.api.click.HandlerRegistration
+import net.hareworks.ghostdisplays.internal.fake.FakeBlockDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeInteraction
+import net.hareworks.ghostdisplays.internal.fake.FakeItemDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeTextDisplay
+import net.hareworks.ghostdisplays.internal.nms.DisplayPacketFactory
 import org.bukkit.Bukkit
-import org.bukkit.entity.Display
+import org.bukkit.Location
-import org.bukkit.entity.Entity
-import org.bukkit.entity.Interaction
 import org.bukkit.entity.Player
-import org.bukkit.event.player.PlayerInteractEntityEvent
+import org.bukkit.inventory.EquipmentSlot
 import org.bukkit.plugin.java.JavaPlugin
 
-internal class BaseDisplayController<T : Display>(
+internal class BaseDisplayController(
     private val plugin: JavaPlugin,
-    override val display: T,
+    val fakeDisplay: FakeDisplay,
-    override val interaction: Interaction?,
+    val fakeInteraction: FakeInteraction?,
     private val registry: DisplayRegistry
-) : DisplayController<T> {
+) : DisplayController {
+
     private val destroyed = AtomicBoolean(false)
     private val viewerCounts = ConcurrentHashMap<UUID, Int>()
     private val handlers = CopyOnWriteArrayList<HandlerEntry>()
 
-    // Audience Management
-    // Audience Management
     private var baseVisibility: Boolean = false
     private val audienceRules = CopyOnWriteArrayList<RuleEntry>()
     private val autoVisiblePlayers = ConcurrentHashMap.newKeySet<UUID>()
-    
-    // 最適化: 定期更新が必要なルールがあるか
     private var hasDynamicRules: Boolean = false
 
+    override val entityId: Int get() = fakeDisplay.entityId
+
+    override val displayType: DisplayType
+        get() = when (fakeDisplay) {
+            is FakeTextDisplay -> DisplayType.TEXT
+            is FakeBlockDisplay -> DisplayType.BLOCK
+            is FakeItemDisplay -> DisplayType.ITEM
+            else -> DisplayType.BLOCK
+        }
+
+    override val location: Location get() = fakeDisplay.location.clone()
+
     override fun needsPeriodicUpdate(): Boolean = hasDynamicRules
 
     override fun show(player: Player) {
-        runSync {
+        val uuid = player.uniqueId
-            val uuid = player.uniqueId
+        val newCount = viewerCounts.compute(uuid) { _, count -> (count ?: 0) + 1 } ?: 1
-            val newCount = viewerCounts.compute(uuid) { _, count -> (count ?: 0) + 1 } ?: 1
+        if (newCount == 1) {
-            if (newCount == 1) {
+            DisplayPacketFactory.sendPacket(player, DisplayPacketFactory.createSpawnBundle(fakeDisplay))
-                player.showEntity(plugin, display)
+            fakeInteraction?.let {
-                interaction?.let { player.showEntity(plugin, it) }
+                DisplayPacketFactory.sendPacket(player, DisplayPacketFactory.createSpawnBundle(it))
             }
         }
     }
 
     override fun hide(player: Player) {
-        runSync {
+        val uuid = player.uniqueId
-            val uuid = player.uniqueId
+        val current = viewerCounts[uuid] ?: return
-            val current = viewerCounts[uuid] ?: return@runSync
+        if (current <= 1) {
-            if (current <= 1) {
+            viewerCounts.remove(uuid)
-                viewerCounts.remove(uuid)
+            val ids = mutableListOf(fakeDisplay.entityId)
-                player.hideEntity(plugin, display)
+            fakeInteraction?.let { ids.add(it.entityId) }
-                interaction?.let { player.hideEntity(plugin, it) }
+            DisplayPacketFactory.sendPacket(player, DisplayPacketFactory.createRemovePacket(*ids.toIntArray()))
-            } else {
+        } else {
-                viewerCounts[uuid] = current - 1
+            viewerCounts[uuid] = current - 1
-            }
         }
     }
 
@@ -72,25 +84,53 @@ internal class BaseDisplayController<T : Display>(
 
     override fun viewerIds(): Set<UUID> = HashSet(viewerCounts.keys)
 
-    override fun applyEntityUpdate(mutator: (T) -> Unit) {
+    override fun updateText(mutator: (FakeTextDisplay) -> Unit) {
-        callSync {
+        check(fakeDisplay is FakeTextDisplay) { "Not a text display" }
-            mutator(display)
+        mutator(fakeDisplay as FakeTextDisplay)
+        broadcastMetadata()
+    }
+
+    override fun updateBlock(mutator: (FakeBlockDisplay) -> Unit) {
+        check(fakeDisplay is FakeBlockDisplay) { "Not a block display" }
+        mutator(fakeDisplay as FakeBlockDisplay)
+        broadcastMetadata()
+    }
+
+    override fun updateItem(mutator: (FakeItemDisplay) -> Unit) {
+        check(fakeDisplay is FakeItemDisplay) { "Not an item display" }
+        mutator(fakeDisplay as FakeItemDisplay)
+        broadcastMetadata()
+    }
+
+    override fun updateDisplay(mutator: (FakeDisplay) -> Unit) {
+        mutator(fakeDisplay)
+        broadcastMetadata()
+    }
+
+    override fun teleport(location: Location) {
+        fakeDisplay.location = location.clone()
+        fakeInteraction?.let { it.location = location.clone() }
+        val viewers = onlineViewers()
+        if (viewers.isEmpty()) return
+        val displayPacket = DisplayPacketFactory.createTeleportPacket(fakeDisplay)
+        viewers.forEach { DisplayPacketFactory.sendPacket(it, displayPacket) }
+        fakeInteraction?.let { interaction ->
+            val interactionPacket = DisplayPacketFactory.createTeleportPacket(interaction)
+            viewers.forEach { DisplayPacketFactory.sendPacket(it, interactionPacket) }
         }
     }
 
     override fun destroy() {
         if (!destroyed.compareAndSet(false, true)) return
         registry.unregister(this)
-        val viewers = viewerIds().mapNotNull { Bukkit.getPlayer(it) }
+        val viewers = onlineViewers()
-        runSync {
+        if (viewers.isNotEmpty()) {
-            viewers.forEach {
+            val ids = mutableListOf(fakeDisplay.entityId)
-                it.hideEntity(plugin, display)
+            fakeInteraction?.let { ids.add(it.entityId) }
-                interaction?.let { interactionEntity -> it.hideEntity(plugin, interactionEntity) }
+            val removePacket = DisplayPacketFactory.createRemovePacket(*ids.toIntArray())
-            }
+            viewers.forEach { DisplayPacketFactory.sendPacket(it, removePacket) }
-            display.remove()
-            interaction?.remove()
-            viewerCounts.clear()
         }
+        viewerCounts.clear()
         handlers.clear()
         audienceRules.clear()
         autoVisiblePlayers.clear()
@@ -99,9 +139,7 @@ internal class BaseDisplayController<T : Display>(
     override fun onClick(priority: ClickPriority, handler: DisplayClickHandler): HandlerRegistration {
         val entry = HandlerEntry(priority, handler)
         handlers += entry
-        return HandlerRegistration {
+        return HandlerRegistration { handlers.remove(entry) }
-            handlers.remove(entry)
-        }
     }
 
     override fun setBaseVisibility(visible: Boolean) {
@@ -125,53 +163,66 @@ internal class BaseDisplayController<T : Display>(
         }
     }
 
-    private fun updateDynamicStatus() {
-        // 簡易判定: クラス名に "Near" が含まれる、または特定の実装であることを期待する
-        // ただし現状はラムダなので名前判定は不安定。
-        // AudiencePredicate 側にマーカーインターフェースをつけるのが正しいが、
-        // 今回は「ユーザー定義のPredicate」も含めて、動的かどうかわからない。
-        // -> AudiencePredicates.near() が返すオブジェクトに特徴を持たせる。
-        hasDynamicRules = audienceRules.any { isDynamicPredicate(it.predicate) }
-    }
-    
-    private fun isDynamicPredicate(predicate: AudiencePredicate): Boolean {
-        // AudiencePredicates.near が返すクラスの実装詳細に依存するか、
-        // AudiencePredicate にプロパティを追加する。
-        // ここでは一旦、toString() 等で識別するか？いや、安全ではない。
-        // API変更: AudiencePredicate に default isDynamic() を追加する。
-        return predicate.isDynamic()
-    }
-
     override fun clearAudienceRules() {
         audienceRules.clear()
         refreshAudience()
     }
 
     override fun refreshAudience(target: Player?) {
-        refreshAudienceInternal(target)
+        val players = target?.let { listOf(it) } ?: Bukkit.getOnlinePlayers()
-    }
+        if (players.isEmpty()) return
 
-    private fun refreshAudienceInternal(target: Player? = null) {
+        players.forEach { player ->
-        runSync {
+            val uuid = player.uniqueId
-            val players = target?.let { listOf(it) } ?: Bukkit.getOnlinePlayers()
+            val shouldBeVisible = evaluateVisibility(player)
-            if (players.isEmpty()) return@runSync
+            val isCurrentlyAutoVisible = autoVisiblePlayers.contains(uuid)
 
-            players.forEach { player ->
+            if (shouldBeVisible && !isCurrentlyAutoVisible) {
-                val uuid = player.uniqueId
+                autoVisiblePlayers.add(uuid)
-                val shouldBeVisible = evaluateVisibility(player)
+                show(player)
-                val isCurrentlyAutoVisible = autoVisiblePlayers.contains(uuid)
+            } else if (!shouldBeVisible && isCurrentlyAutoVisible) {
-
+                autoVisiblePlayers.remove(uuid)
-                if (shouldBeVisible && !isCurrentlyAutoVisible) {
+                hide(player)
-                    autoVisiblePlayers.add(uuid)
-                    show(player)
-                } else if (!shouldBeVisible && isCurrentlyAutoVisible) {
-                    autoVisiblePlayers.remove(uuid)
-                    hide(player)
-                }
             }
         }
     }
 
+    internal fun handleClick(player: Player, clickedEntityId: Int, surface: ClickSurface) {
+        val sortedHandlers = handlers.sortedBy { it.priority.ordinal }
+        if (sortedHandlers.isEmpty()) return
+        val context = DisplayClickContext(
+            player = player,
+            hand = EquipmentSlot.HAND,
+            entityId = clickedEntityId,
+            surface = surface,
+            controller = this
+        )
+        sortedHandlers.forEach { entry ->
+            entry.handler.handle(context)
+            if (context.cancelled) return
+        }
+    }
+
+    internal fun handlePlayerQuit(player: Player) {
+        val uuid = player.uniqueId
+        viewerCounts.remove(uuid)
+        autoVisiblePlayers.remove(uuid)
+    }
+
+    private fun broadcastMetadata() {
+        val viewers = onlineViewers()
+        if (viewers.isEmpty()) return
+        val packet = DisplayPacketFactory.createMetadataPacket(fakeDisplay)
+        viewers.forEach { DisplayPacketFactory.sendPacket(it, packet) }
+    }
+
+    private fun onlineViewers(): List<Player> =
+        viewerCounts.keys.mapNotNull { Bukkit.getPlayer(it) }
+
+    private fun updateDynamicStatus() {
+        hasDynamicRules = audienceRules.any { it.predicate.isDynamic() }
+    }
+
     private fun evaluateVisibility(player: Player): Boolean {
         var visible = baseVisibility
         for (rule in audienceRules) {
@@ -186,50 +237,6 @@ internal class BaseDisplayController<T : Display>(
         return visible
     }
 
-    internal fun handleClick(event: PlayerInteractEntityEvent, clicked: Entity, surface: ClickSurface) {
-        val sortedHandlers = handlers.sortedBy { it.priority.ordinal }
-        if (sortedHandlers.isEmpty()) return
-        val context = DisplayClickContext(
-            player = event.player,
-            hand = event.hand,
-            clickedEntity = clicked,
-            surface = surface,
-            controller = this,
-            event = event
-        )
-        sortedHandlers.forEach { entry ->
-            entry.handler.handle(context)
-            if (event.isCancelled) return
-        }
-    }
-
-    internal fun handlePlayerQuit(player: Player) {
-        val uuid = player.uniqueId
-        viewerCounts.remove(uuid)
-        autoVisiblePlayers.remove(uuid)
-        // Note: ref count logic doesn't strictly need persistent cleanup if we remove from counts, 
-        // but removing from autoVisiblePlayers ensures we don't think we're showing it if they rejoin?
-        // Actually, if they quit, we should probably clear for them.
-    }
-
-    private fun runSync(action: () -> Unit) {
-        if (Bukkit.isOwnedByCurrentRegion(display)) {
-            action()
-        } else {
-            display.scheduler.run(plugin, { action() }, null)
-        }
-    }
-
-    private fun <R> callSync(action: () -> R): R {
-        return if (Bukkit.isOwnedByCurrentRegion(display)) {
-            action()
-        } else {
-            val future = CompletableFuture<R>()
-            display.scheduler.run(plugin, { future.complete(action()) }, { future.cancel(false) })
-            future.join()
-        }
-    }
-
     private data class RuleEntry(
         val predicate: AudiencePredicate,
         val action: AudienceAction

src/main/kotlin/net/hareworks/ghostdisplays/internal/controller/DisplayRegistry.kt

@@ -1,35 +1,50 @@
 package net.hareworks.ghostdisplays.internal.controller
 
-import java.util.UUID
 import java.util.concurrent.ConcurrentHashMap
 import net.hareworks.ghostdisplays.api.click.ClickSurface
-import org.bukkit.entity.Display
+import net.hareworks.ghostdisplays.internal.nms.InteractionPacketListener
-import org.bukkit.entity.Entity
+import org.bukkit.Bukkit
-import org.bukkit.entity.Interaction
 import org.bukkit.entity.Player
 import org.bukkit.event.EventHandler
 import org.bukkit.event.Listener
 import org.bukkit.event.player.PlayerChangedWorldEvent
-import org.bukkit.event.player.PlayerInteractEntityEvent
 import org.bukkit.event.player.PlayerJoinEvent
 import org.bukkit.event.player.PlayerQuitEvent
 import org.bukkit.event.player.PlayerRespawnEvent
+import org.bukkit.plugin.java.JavaPlugin
 
 internal class DisplayRegistry : Listener {
-    private val displayControllers = ConcurrentHashMap<UUID, BaseDisplayController<out Display>>()
+    private val displayControllers = ConcurrentHashMap<Int, BaseDisplayController>()
-    private val interactionControllers = ConcurrentHashMap<UUID, BaseDisplayController<out Display>>()
+    private val interactionControllers = ConcurrentHashMap<Int, BaseDisplayController>()
+    private lateinit var packetListener: InteractionPacketListener
 
-    fun register(controller: BaseDisplayController<out Display>) {
+    fun initialize(plugin: JavaPlugin) {
-        displayControllers[controller.display.uniqueId] = controller
+        packetListener = InteractionPacketListener(plugin) { player, entityId, isAttack ->
-        controller.interaction?.let {
+            if (isAttack) return@InteractionPacketListener
-            interactionControllers[it.uniqueId] = controller
+            val fromInteraction = interactionControllers[entityId]
+            val fromDisplay = displayControllers[entityId]
+            val controller = fromInteraction ?: fromDisplay ?: return@InteractionPacketListener
+            val surface = if (fromInteraction != null) ClickSurface.INTERACTION else ClickSurface.DISPLAY
+            val loc = controller.fakeDisplay.location
+            plugin.server.regionScheduler.execute(plugin, loc) {
+                controller.handleClick(player, entityId, surface)
+            }
+        }
+        packetListener.injectAll()
+        plugin.server.pluginManager.registerEvents(packetListener, plugin)
+    }
+
+    fun register(controller: BaseDisplayController) {
+        displayControllers[controller.fakeDisplay.entityId] = controller
+        controller.fakeInteraction?.let {
+            interactionControllers[it.entityId] = controller
         }
     }
 
-    fun unregister(controller: BaseDisplayController<out Display>) {
+    fun unregister(controller: BaseDisplayController) {
-        displayControllers.remove(controller.display.uniqueId, controller)
+        displayControllers.remove(controller.fakeDisplay.entityId, controller)
-        controller.interaction?.let {
+        controller.fakeInteraction?.let {
-            interactionControllers.remove(it.uniqueId, controller)
+            interactionControllers.remove(it.entityId, controller)
         }
     }
 
@@ -40,14 +55,6 @@ internal class DisplayRegistry : Listener {
         interactionControllers.clear()
     }
 
-    @EventHandler
-    fun onPlayerInteractEntity(event: PlayerInteractEntityEvent) {
-        val entity = event.rightClicked
-        val controller = lookupController(entity) ?: return
-        val surface = if (entity is Interaction) ClickSurface.INTERACTION else ClickSurface.DISPLAY
-        controller.handleClick(event, entity, surface)
-    }
-
     @EventHandler
     fun onPlayerQuit(event: PlayerQuitEvent) {
         controllersSnapshot().forEach { it.handlePlayerQuit(event.player) }
@@ -68,12 +75,7 @@ internal class DisplayRegistry : Listener {
         refreshAudiences(event.player)
     }
 
-    private fun lookupController(entity: Entity): BaseDisplayController<out Display>? {
+    private fun controllersSnapshot(): Collection<BaseDisplayController> =
-        return displayControllers[entity.uniqueId]
-            ?: interactionControllers[entity.uniqueId]
-    }
-
-    private fun controllersSnapshot(): Collection<BaseDisplayController<out Display>> =
         displayControllers.values.toSet()
 
     private fun refreshAudiences(player: Player) {
@@ -83,15 +85,12 @@ internal class DisplayRegistry : Listener {
     }
 
     fun updateAudiences() {
-        val players = org.bukkit.Bukkit.getOnlinePlayers()
+        val players = Bukkit.getOnlinePlayers()
         if (players.isEmpty()) return
         val controllers = controllersSnapshot()
         if (controllers.isEmpty()) return
-        
-        // 動的な評価が必要なコントローラーだけを抽出して評価する
         val activeControllers = controllers.filter { it.needsPeriodicUpdate() }
         if (activeControllers.isEmpty()) return
-
         players.forEach { player ->
             activeControllers.forEach { controller ->
                 controller.refreshAudience(player)

src/main/kotlin/net/hareworks/ghostdisplays/internal/fake/FakeBlockDisplay.kt

@@ -0,0 +1,15 @@
+package net.hareworks.ghostdisplays.internal.fake
+
+import java.util.UUID
+import org.bukkit.Bukkit
+import org.bukkit.Location
+import org.bukkit.block.data.BlockData
+
+class FakeBlockDisplay(
+    entityId: Int,
+    uuid: UUID,
+    location: Location
+) : FakeDisplay(entityId, uuid, location) {
+
+    var blockData: BlockData = Bukkit.createBlockData("minecraft:stone")
+}

src/main/kotlin/net/hareworks/ghostdisplays/internal/fake/FakeDisplay.kt

@@ -0,0 +1,42 @@
+package net.hareworks.ghostdisplays.internal.fake
+
+import java.util.UUID
+import org.bukkit.Location
+import org.bukkit.entity.Display.Billboard
+import org.bukkit.entity.Display.Brightness
+import org.bukkit.util.Transformation
+import org.joml.Quaternionf
+import org.joml.Vector3f
+
+open class FakeDisplay(
+    entityId: Int,
+    uuid: UUID,
+    location: Location
+) : FakeEntity(entityId, uuid, location) {
+
+    var translation: Vector3f = Vector3f(0f, 0f, 0f)
+    var scale: Vector3f = Vector3f(1f, 1f, 1f)
+    var leftRotation: Quaternionf = Quaternionf()
+    var rightRotation: Quaternionf = Quaternionf()
+
+    var transformation: Transformation
+        get() = Transformation(translation, leftRotation, scale, rightRotation)
+        set(value) {
+            translation = value.translation
+            leftRotation = value.leftRotation
+            scale = value.scale
+            rightRotation = value.rightRotation
+        }
+
+    var interpolationDelay: Int = 0
+    var interpolationDuration: Int = 0
+    var teleportInterpolationDuration: Int = 0
+    var billboard: Billboard = Billboard.FIXED
+    var brightness: Brightness? = null
+    var viewRange: Float = 1.0f
+    var shadowRadius: Float = 0.0f
+    var shadowStrength: Float = 1.0f
+    var displayWidth: Float = 0.0f
+    var displayHeight: Float = 0.0f
+    var glowColorOverride: Int = -1
+}

src/main/kotlin/net/hareworks/ghostdisplays/internal/fake/FakeEntity.kt

@@ -0,0 +1,10 @@
+package net.hareworks.ghostdisplays.internal.fake
+
+import java.util.UUID
+import org.bukkit.Location
+
+open class FakeEntity(
+    val entityId: Int,
+    val uuid: UUID,
+    var location: Location
+)

src/main/kotlin/net/hareworks/ghostdisplays/internal/fake/FakeInteraction.kt

@@ -0,0 +1,15 @@
+package net.hareworks.ghostdisplays.internal.fake
+
+import java.util.UUID
+import org.bukkit.Location
+
+class FakeInteraction(
+    entityId: Int,
+    uuid: UUID,
+    location: Location
+) : FakeEntity(entityId, uuid, location) {
+
+    var width: Float = 0.8f
+    var height: Float = 0.8f
+    var responsive: Boolean = true
+}

src/main/kotlin/net/hareworks/ghostdisplays/internal/fake/FakeItemDisplay.kt

@@ -0,0 +1,16 @@
+package net.hareworks.ghostdisplays.internal.fake
+
+import java.util.UUID
+import org.bukkit.Location
+import org.bukkit.entity.ItemDisplay.ItemDisplayTransform
+import org.bukkit.inventory.ItemStack
+
+class FakeItemDisplay(
+    entityId: Int,
+    uuid: UUID,
+    location: Location
+) : FakeDisplay(entityId, uuid, location) {
+
+    var itemStack: ItemStack = ItemStack.empty()
+    var itemDisplayTransform: ItemDisplayTransform = ItemDisplayTransform.NONE
+}

src/main/kotlin/net/hareworks/ghostdisplays/internal/fake/FakeTextDisplay.kt

@@ -0,0 +1,26 @@
+package net.hareworks.ghostdisplays.internal.fake
+
+import java.util.UUID
+import net.kyori.adventure.text.Component
+import org.bukkit.Location
+
+class FakeTextDisplay(
+    entityId: Int,
+    uuid: UUID,
+    location: Location
+) : FakeDisplay(entityId, uuid, location) {
+
+    var text: Component = Component.empty()
+    var lineWidth: Int = 200
+    var backgroundColor: Int = 0x40000000
+    var textOpacity: Byte = -1
+    var styleFlags: Byte = 0
+
+    companion object {
+        const val FLAG_SHADOW: Byte = 0x01
+        const val FLAG_SEE_THROUGH: Byte = 0x02
+        const val FLAG_DEFAULT_BACKGROUND: Byte = 0x04
+        const val FLAG_ALIGN_LEFT: Byte = 0x08
+        const val FLAG_ALIGN_RIGHT: Byte = 0x10
+    }
+}

src/main/kotlin/net/hareworks/ghostdisplays/internal/nms/DisplayPacketFactory.kt

@@ -0,0 +1,181 @@
+package net.hareworks.ghostdisplays.internal.nms
+
+import io.papermc.paper.adventure.PaperAdventure
+import net.hareworks.ghostdisplays.internal.fake.FakeBlockDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeEntity
+import net.hareworks.ghostdisplays.internal.fake.FakeInteraction
+import net.hareworks.ghostdisplays.internal.fake.FakeItemDisplay
+import net.hareworks.ghostdisplays.internal.fake.FakeTextDisplay
+import net.minecraft.network.protocol.Packet
+import net.minecraft.network.protocol.game.ClientboundAddEntityPacket
+import net.minecraft.network.protocol.game.ClientboundBundlePacket
+import net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket
+import net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket
+import net.minecraft.network.protocol.game.ClientboundTeleportEntityPacket
+import net.minecraft.network.syncher.SynchedEntityData
+import net.minecraft.world.entity.Entity
+import net.minecraft.world.entity.EntityType
+import net.minecraft.world.entity.PositionMoveRotation
+import net.minecraft.world.phys.Vec3
+import org.bukkit.craftbukkit.block.data.CraftBlockData
+import org.bukkit.craftbukkit.entity.CraftPlayer
+import org.bukkit.craftbukkit.inventory.CraftItemStack
+import org.bukkit.entity.Display.Billboard
+import org.bukkit.entity.Player
+
+internal object DisplayPacketFactory {
+
+    fun nextEntityId(): Int = Entity.nextEntityId()
+
+    // --- Spawn packets ---
+
+    fun createSpawnPacket(fake: FakeDisplay): ClientboundAddEntityPacket {
+        val entityType = when (fake) {
+            is FakeTextDisplay -> EntityType.TEXT_DISPLAY
+            is FakeBlockDisplay -> EntityType.BLOCK_DISPLAY
+            is FakeItemDisplay -> EntityType.ITEM_DISPLAY
+            else -> EntityType.BLOCK_DISPLAY
+        }
+        return ClientboundAddEntityPacket(
+            fake.entityId,
+            fake.uuid,
+            fake.location.x, fake.location.y, fake.location.z,
+            fake.location.pitch, fake.location.yaw,
+            entityType,
+            0,
+            Vec3.ZERO,
+            0.0
+        )
+    }
+
+    fun createSpawnPacket(fake: FakeInteraction): ClientboundAddEntityPacket {
+        return ClientboundAddEntityPacket(
+            fake.entityId,
+            fake.uuid,
+            fake.location.x, fake.location.y, fake.location.z,
+            0f, 0f,
+            EntityType.INTERACTION,
+            0,
+            Vec3.ZERO,
+            0.0
+        )
+    }
+
+    // --- Metadata packets ---
+
+    fun createMetadataPacket(fake: FakeDisplay): ClientboundSetEntityDataPacket {
+        val values = buildDisplayMetadata(fake)
+        when (fake) {
+            is FakeTextDisplay -> values.addAll(buildTextMetadata(fake))
+            is FakeBlockDisplay -> values.addAll(buildBlockMetadata(fake))
+            is FakeItemDisplay -> values.addAll(buildItemMetadata(fake))
+        }
+        return ClientboundSetEntityDataPacket(fake.entityId, values)
+    }
+
+    fun createMetadataPacket(fake: FakeInteraction): ClientboundSetEntityDataPacket {
+        val values = buildInteractionMetadata(fake)
+        return ClientboundSetEntityDataPacket(fake.entityId, values)
+    }
+
+    // --- Bundle (spawn + metadata) ---
+
+    fun createSpawnBundle(fake: FakeDisplay): ClientboundBundlePacket {
+        return ClientboundBundlePacket(
+            listOf(createSpawnPacket(fake), createMetadataPacket(fake))
+        )
+    }
+
+    fun createSpawnBundle(fake: FakeInteraction): ClientboundBundlePacket {
+        return ClientboundBundlePacket(
+            listOf(createSpawnPacket(fake), createMetadataPacket(fake))
+        )
+    }
+
+    // --- Remove ---
+
+    fun createRemovePacket(vararg entityIds: Int): ClientboundRemoveEntitiesPacket {
+        return ClientboundRemoveEntitiesPacket(*entityIds)
+    }
+
+    // --- Teleport ---
+
+    fun createTeleportPacket(fake: FakeEntity): ClientboundTeleportEntityPacket {
+        val loc = fake.location
+        return ClientboundTeleportEntityPacket(
+            fake.entityId,
+            PositionMoveRotation(Vec3(loc.x, loc.y, loc.z), Vec3.ZERO, loc.yaw, loc.pitch),
+            java.util.Set.of(),
+            false
+        )
+    }
+
+    // --- Send ---
+
+    fun sendPacket(player: Player, packet: Packet<*>) {
+        (player as CraftPlayer).handle.connection.send(packet)
+    }
+
+    // --- Metadata builders ---
+
+    private fun buildDisplayMetadata(fake: FakeDisplay): MutableList<SynchedEntityData.DataValue<*>> {
+        val values = mutableListOf<SynchedEntityData.DataValue<*>>()
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.TRANSLATION, fake.translation))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.SCALE, fake.scale))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.LEFT_ROTATION, fake.leftRotation))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.RIGHT_ROTATION, fake.rightRotation))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.INTERPOLATION_DELAY, fake.interpolationDelay))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.INTERPOLATION_DURATION, fake.interpolationDuration))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.TELEPORT_INTERPOLATION_DURATION, fake.teleportInterpolationDuration))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.BILLBOARD, billboardToByte(fake.billboard)))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.BRIGHTNESS_OVERRIDE, packBrightness(fake.brightness)))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.VIEW_RANGE, fake.viewRange))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.SHADOW_RADIUS, fake.shadowRadius))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.SHADOW_STRENGTH, fake.shadowStrength))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.DISPLAY_WIDTH, fake.displayWidth))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.DISPLAY_HEIGHT, fake.displayHeight))
+        values.add(SynchedEntityData.DataValue.create(EntityDataFields.GLOW_COLOR_OVERRIDE, fake.glowColorOverride))
+        return values
+    }
+
+    private fun buildTextMetadata(fake: FakeTextDisplay): List<SynchedEntityData.DataValue<*>> {
+        return listOf(
+            SynchedEntityData.DataValue.create(EntityDataFields.TEXT, PaperAdventure.asVanilla(fake.text)),
+            SynchedEntityData.DataValue.create(EntityDataFields.LINE_WIDTH, fake.lineWidth),
+            SynchedEntityData.DataValue.create(EntityDataFields.BACKGROUND_COLOR, fake.backgroundColor),
+            SynchedEntityData.DataValue.create(EntityDataFields.TEXT_OPACITY, fake.textOpacity),
+            SynchedEntityData.DataValue.create(EntityDataFields.STYLE_FLAGS, fake.styleFlags)
+        )
+    }
+
+    private fun buildBlockMetadata(fake: FakeBlockDisplay): List<SynchedEntityData.DataValue<*>> {
+        val nmsBlockState = (fake.blockData as CraftBlockData).state
+        return listOf(
+            SynchedEntityData.DataValue.create(EntityDataFields.BLOCK_STATE, nmsBlockState)
+        )
+    }
+
+    private fun buildItemMetadata(fake: FakeItemDisplay): List<SynchedEntityData.DataValue<*>> {
+        val nmsItemStack = CraftItemStack.asNMSCopy(fake.itemStack)
+        return listOf(
+            SynchedEntityData.DataValue.create(EntityDataFields.ITEM_STACK, nmsItemStack),
+            SynchedEntityData.DataValue.create(EntityDataFields.ITEM_DISPLAY_TRANSFORM, fake.itemDisplayTransform.ordinal.toByte())
+        )
+    }
+
+    private fun buildInteractionMetadata(fake: FakeInteraction): MutableList<SynchedEntityData.DataValue<*>> {
+        return mutableListOf(
+            SynchedEntityData.DataValue.create(EntityDataFields.INTERACTION_WIDTH, fake.width),
+            SynchedEntityData.DataValue.create(EntityDataFields.INTERACTION_HEIGHT, fake.height),
+            SynchedEntityData.DataValue.create(EntityDataFields.INTERACTION_RESPONSE, fake.responsive)
+        )
+    }
+
+    private fun billboardToByte(billboard: Billboard): Byte = billboard.ordinal.toByte()
+
+    private fun packBrightness(brightness: org.bukkit.entity.Display.Brightness?): Int {
+        if (brightness == null) return -1
+        return brightness.blockLight or (brightness.skyLight shl 4)
+    }
+}

src/main/kotlin/net/hareworks/ghostdisplays/internal/nms/EntityDataFields.kt

@@ -0,0 +1,227 @@
+package net.hareworks.ghostdisplays.internal.nms
+
+import java.lang.invoke.MethodHandles
+import net.minecraft.network.chat.Component as NmsComponent
+import net.minecraft.network.syncher.EntityDataAccessor
+import net.minecraft.world.entity.Display as NmsDisplay
+import net.minecraft.world.entity.Interaction as NmsInteraction
+import net.minecraft.world.item.ItemStack as NmsItemStack
+import net.minecraft.world.level.block.state.BlockState
+import org.joml.Quaternionf
+import org.joml.Vector3f
+
+@Suppress("UNCHECKED_CAST")
+internal object EntityDataFields {
+
+    // --- Display (common) ---
+
+    private val displayLookup = MethodHandles.privateLookupIn(
+        NmsDisplay::class.java, MethodHandles.lookup()
+    )
+
+    val INTERPOLATION_DELAY: EntityDataAccessor<Int> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_TRANSFORMATION_INTERPOLATION_START_DELTA_TICKS_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Int>
+
+    val INTERPOLATION_DURATION: EntityDataAccessor<Int> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_TRANSFORMATION_INTERPOLATION_DURATION_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Int>
+
+    val TELEPORT_INTERPOLATION_DURATION: EntityDataAccessor<Int> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_POS_ROT_INTERPOLATION_DURATION_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Int>
+
+    val TRANSLATION: EntityDataAccessor<Vector3f> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_TRANSLATION_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Vector3f>
+
+    val SCALE: EntityDataAccessor<Vector3f> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_SCALE_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Vector3f>
+
+    val LEFT_ROTATION: EntityDataAccessor<Quaternionf> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_LEFT_ROTATION_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Quaternionf>
+
+    val RIGHT_ROTATION: EntityDataAccessor<Quaternionf> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_RIGHT_ROTATION_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Quaternionf>
+
+    val BILLBOARD: EntityDataAccessor<Byte> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_BILLBOARD_RENDER_CONSTRAINTS_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Byte>
+
+    val BRIGHTNESS_OVERRIDE: EntityDataAccessor<Int> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_BRIGHTNESS_OVERRIDE_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Int>
+
+    val VIEW_RANGE: EntityDataAccessor<Float> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_VIEW_RANGE_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Float>
+
+    val SHADOW_RADIUS: EntityDataAccessor<Float> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_SHADOW_RADIUS_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Float>
+
+    val SHADOW_STRENGTH: EntityDataAccessor<Float> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_SHADOW_STRENGTH_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Float>
+
+    val DISPLAY_WIDTH: EntityDataAccessor<Float> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_WIDTH_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Float>
+
+    val DISPLAY_HEIGHT: EntityDataAccessor<Float> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_HEIGHT_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Float>
+
+    val GLOW_COLOR_OVERRIDE: EntityDataAccessor<Int> =
+        displayLookup.findStaticGetter(
+            NmsDisplay::class.java,
+            "DATA_GLOW_COLOR_OVERRIDE_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Int>
+
+    // --- TextDisplay ---
+
+    private val textDisplayLookup = MethodHandles.privateLookupIn(
+        NmsDisplay.TextDisplay::class.java, MethodHandles.lookup()
+    )
+
+    val TEXT: EntityDataAccessor<NmsComponent> =
+        textDisplayLookup.findStaticGetter(
+            NmsDisplay.TextDisplay::class.java,
+            "DATA_TEXT_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<NmsComponent>
+
+    val LINE_WIDTH: EntityDataAccessor<Int> =
+        textDisplayLookup.findStaticGetter(
+            NmsDisplay.TextDisplay::class.java,
+            "DATA_LINE_WIDTH_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Int>
+
+    val BACKGROUND_COLOR: EntityDataAccessor<Int> =
+        textDisplayLookup.findStaticGetter(
+            NmsDisplay.TextDisplay::class.java,
+            "DATA_BACKGROUND_COLOR_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Int>
+
+    val TEXT_OPACITY: EntityDataAccessor<Byte> =
+        textDisplayLookup.findStaticGetter(
+            NmsDisplay.TextDisplay::class.java,
+            "DATA_TEXT_OPACITY_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Byte>
+
+    val STYLE_FLAGS: EntityDataAccessor<Byte> =
+        textDisplayLookup.findStaticGetter(
+            NmsDisplay.TextDisplay::class.java,
+            "DATA_STYLE_FLAGS_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Byte>
+
+    // --- BlockDisplay ---
+
+    private val blockDisplayLookup = MethodHandles.privateLookupIn(
+        NmsDisplay.BlockDisplay::class.java, MethodHandles.lookup()
+    )
+
+    val BLOCK_STATE: EntityDataAccessor<BlockState> =
+        blockDisplayLookup.findStaticGetter(
+            NmsDisplay.BlockDisplay::class.java,
+            "DATA_BLOCK_STATE_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<BlockState>
+
+    // --- ItemDisplay ---
+
+    private val itemDisplayLookup = MethodHandles.privateLookupIn(
+        NmsDisplay.ItemDisplay::class.java, MethodHandles.lookup()
+    )
+
+    val ITEM_STACK: EntityDataAccessor<NmsItemStack> =
+        itemDisplayLookup.findStaticGetter(
+            NmsDisplay.ItemDisplay::class.java,
+            "DATA_ITEM_STACK_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<NmsItemStack>
+
+    val ITEM_DISPLAY_TRANSFORM: EntityDataAccessor<Byte> =
+        itemDisplayLookup.findStaticGetter(
+            NmsDisplay.ItemDisplay::class.java,
+            "DATA_ITEM_DISPLAY_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Byte>
+
+    // --- Interaction ---
+
+    private val interactionLookup = MethodHandles.privateLookupIn(
+        NmsInteraction::class.java, MethodHandles.lookup()
+    )
+
+    val INTERACTION_WIDTH: EntityDataAccessor<Float> =
+        interactionLookup.findStaticGetter(
+            NmsInteraction::class.java,
+            "DATA_WIDTH_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Float>
+
+    val INTERACTION_HEIGHT: EntityDataAccessor<Float> =
+        interactionLookup.findStaticGetter(
+            NmsInteraction::class.java,
+            "DATA_HEIGHT_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Float>
+
+    val INTERACTION_RESPONSE: EntityDataAccessor<Boolean> =
+        interactionLookup.findStaticGetter(
+            NmsInteraction::class.java,
+            "DATA_RESPONSE_ID",
+            EntityDataAccessor::class.java
+        ).invoke() as EntityDataAccessor<Boolean>
+}

src/main/kotlin/net/hareworks/ghostdisplays/internal/nms/InteractionPacketListener.kt

@@ -0,0 +1,94 @@
+package net.hareworks.ghostdisplays.internal.nms
+
+import io.netty.channel.ChannelDuplexHandler
+import io.netty.channel.ChannelHandlerContext
+import java.lang.invoke.MethodHandles
+import java.util.logging.Level
+import net.minecraft.network.protocol.game.ServerboundInteractPacket
+import org.bukkit.craftbukkit.entity.CraftPlayer
+import org.bukkit.entity.Player
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.player.PlayerJoinEvent
+import org.bukkit.event.player.PlayerQuitEvent
+import org.bukkit.plugin.java.JavaPlugin
+
+internal class InteractionPacketListener(
+    private val plugin: JavaPlugin,
+    private val onInteract: (player: Player, entityId: Int, isAttack: Boolean) -> Unit
+) : Listener {
+
+    companion object {
+        private const val HANDLER_NAME = "ghostdisplays_interact"
+
+        private val ENTITY_ID_GETTER = run {
+            val lookup = MethodHandles.privateLookupIn(
+                ServerboundInteractPacket::class.java,
+                MethodHandles.lookup()
+            )
+            lookup.findGetter(
+                ServerboundInteractPacket::class.java,
+                "entityId",
+                Int::class.javaPrimitiveType
+            )
+        }
+    }
+
+    fun injectAll() {
+        plugin.server.onlinePlayers.forEach { inject(it) }
+    }
+
+    fun inject(player: Player) {
+        val channel = (player as CraftPlayer).handle.connection.connection.channel
+        channel.eventLoop().execute {
+            if (channel.pipeline().get(HANDLER_NAME) != null) return@execute
+            channel.pipeline().addBefore("packet_handler", HANDLER_NAME, createHandler(player))
+        }
+    }
+
+    fun uninject(player: Player) {
+        val channel = (player as CraftPlayer).handle.connection.connection.channel
+        channel.eventLoop().execute {
+            if (channel.pipeline().get(HANDLER_NAME) != null) {
+                channel.pipeline().remove(HANDLER_NAME)
+            }
+        }
+    }
+
+    @EventHandler
+    fun onPlayerJoin(event: PlayerJoinEvent) {
+        inject(event.player)
+    }
+
+    @EventHandler
+    fun onPlayerQuit(event: PlayerQuitEvent) {
+        uninject(event.player)
+    }
+
+    private fun createHandler(player: Player): ChannelDuplexHandler {
+        return object : ChannelDuplexHandler() {
+            override fun channelRead(ctx: ChannelHandlerContext, msg: Any) {
+                if (msg is ServerboundInteractPacket) {
+                    try {
+                        val entityId = ENTITY_ID_GETTER.invoke(msg) as Int
+                        val isAttack = isAttackAction(msg)
+                        onInteract(player, entityId, isAttack)
+                    } catch (ex: Throwable) {
+                        plugin.logger.log(Level.WARNING, "Failed to handle interact packet", ex)
+                    }
+                }
+                super.channelRead(ctx, msg)
+            }
+        }
+    }
+
+    private fun isAttackAction(packet: ServerboundInteractPacket): Boolean {
+        var attack = false
+        packet.dispatch(object : ServerboundInteractPacket.Handler {
+            override fun onInteraction(hand: net.minecraft.world.InteractionHand) {}
+            override fun onInteraction(hand: net.minecraft.world.InteractionHand, pos: net.minecraft.world.phys.Vec3) {}
+            override fun onAttack() { attack = true }
+        })
+        return attack
+    }
+}