Merge pull request #365 from Exanthiax/develop

fix empty nbt

build.gradle.kts

@@ -22,6 +22,7 @@ dependencies {
     implementation(project(path = ":eco-core:core-plugin", configuration = "shadow"))
     implementation(project(":eco-core:core-proxy"))
     implementation(project(":eco-core:core-backend"))
+    implementation(project(":eco-core:core-backend-modern"))
     implementation(project(path = ":eco-core:core-nms:v1_17_R1", configuration = "reobf"))
     implementation(project(path = ":eco-core:core-nms:v1_18_R1", configuration = "reobf"))
     implementation(project(path = ":eco-core:core-nms:v1_18_R2", configuration = "reobf"))
@@ -31,7 +32,7 @@ dependencies {
     implementation(project(path = ":eco-core:core-nms:v1_20_R1", configuration = "reobf"))
     implementation(project(path = ":eco-core:core-nms:v1_20_R2", configuration = "reobf"))
     implementation(project(path = ":eco-core:core-nms:v1_20_R3", configuration = "reobf"))
-    implementation(project(path = ":eco-core:core-nms:v1_20_6", configuration = "reobf"))
+    implementation(project(path = ":eco-core:core-nms:v1_21", configuration = "reobf"))
 }
 
 allprojects {
@@ -44,9 +45,10 @@ allprojects {
 
     repositories {
         mavenCentral()
-        mavenLocal()
         maven("https://repo.auxilor.io/repository/maven-public/")
-        maven("https://jitpack.io")
+        maven("https://jitpack.io") {
+            content { includeGroupByRegex("com\\.github\\..*") }
+        }
 
         // SuperiorSkyblock2
         maven("https://repo.bg-software.com/repository/api/")
@@ -95,6 +97,9 @@ allprojects {
 
         // HuskPlugins
         maven("https://repo.william278.net/releases")
+
+        // FancyHolograms
+        maven("https://repo.fancyplugins.de/releases")
     }
 
     dependencies {
@@ -158,12 +163,6 @@ allprojects {
             options.encoding = "UTF-8"
         }
 
-        java {
-            sourceCompatibility = JavaVersion.VERSION_17
-            targetCompatibility = JavaVersion.VERSION_17
-            withSourcesJar()
-        }
-
         test {
             useJUnitPlatform()
 
@@ -176,6 +175,17 @@ allprojects {
         build {
             dependsOn(shadowJar)
         }
+
+        withType<JavaCompile>().configureEach {
+            options.release = 17
+        }
+    }
+
+    java {
+        withSourcesJar()
+        toolchain {
+            languageVersion = JavaLanguageVersion.of(21)
+        }
     }
 }
 
@@ -215,12 +225,5 @@ tasks {
     }
 }
 
-// Root is Java 21 to support 1.20.6+, rest use Java 17
-java {
-    sourceCompatibility = JavaVersion.VERSION_21
-    targetCompatibility = JavaVersion.VERSION_21
-    withSourcesJar()
-}
-
 group = "com.willfp"
 version = findProperty("version")!!

eco-api/src/main/java/com/willfp/eco/core/EcoPlugin.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core;
 
+import com.google.common.collect.ImmutableList;
 import com.willfp.eco.core.command.impl.PluginCommand;
 import com.willfp.eco.core.config.base.ConfigYml;
 import com.willfp.eco.core.config.base.LangYml;
@@ -36,6 +37,8 @@ import org.jetbrains.annotations.Nullable;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Objects;
@@ -120,9 +123,17 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike, Regist
 
     /**
      * The display module for the plugin.
+     *
+     * @deprecated Plugins can now have multiple display modules.
      */
+    @Deprecated(since = "6.72.0")
     private DisplayModule displayModule;
 
+    /**
+     * The display modules for the plugin.
+     */
+    private List<DisplayModule> displayModules = new ArrayList<>();
+
     /**
      * The logger for the plugin.
      */
@@ -555,10 +566,15 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike, Regist
      * Default code to be executed after the server is up.
      */
     public final void afterLoad() {
-        this.displayModule = createDisplayModule();
+        DisplayModule module = createDisplayModule();
+        if (module != null) {
+            Display.registerDisplayModule(module);
+            this.displayModules.add(module);
+        }
 
-        if (this.getDisplayModule() != null) {
+        for (DisplayModule displayModule : this.loadDisplayModules()) {
-            Display.registerDisplayModule(this.getDisplayModule());
+            Display.registerDisplayModule(displayModule);
+            this.displayModules.add(displayModule);
         }
 
         if (Prerequisite.HAS_PROTOCOLLIB.isMet()) {
@@ -899,14 +915,25 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike, Regist
      * Create the display module for the plugin.
      *
      * @return The display module, or null.
+     * @deprecated Use {@link #loadDisplayModules()} instead.
      */
     @Nullable
+    @Deprecated(since = "6.72.0")
     protected DisplayModule createDisplayModule() {
         Validate.isTrue(this.getDisplayModule() == null, "Display module exists!");
 
         return null;
     }
 
+    /**
+     * Load display modules.
+     *
+     * @return The display modules.
+     */
+    protected List<DisplayModule> loadDisplayModules() {
+        return new ArrayList<>();
+    }
+
     /**
      * Get the minimum version of eco to use the plugin.
      *
@@ -1156,12 +1183,23 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike, Regist
      * Get the plugin's display module.
      *
      * @return The display module.
+     * @deprecated Use {@link #getDisplayModules()} instead.
      */
     @Nullable
+    @Deprecated(since = "6.72.0", forRemoval = true)
     public DisplayModule getDisplayModule() {
         return this.displayModule;
     }
 
+    /**
+     * Get the plugin's display modules.
+     *
+     * @return The display modules.
+     */
+    public List<DisplayModule> getDisplayModules() {
+        return ImmutableList.copyOf(this.displayModules);
+    }
+
     /**
      * Get if the plugin is outdated.
      *

eco-api/src/main/java/com/willfp/eco/core/Prerequisite.java

@@ -37,11 +37,20 @@ public class Prerequisite {
             "Requires server to have ProtocolLib"
     );
 
+    /**
+     * Requires the server to be running 1.21.
+     */
+    public static final Prerequisite HAS_1_21 = new Prerequisite(
+            () -> ProxyConstants.NMS_VERSION.contains("1_21"),
+            "Requires server to be running 1.21+"
+    );
+
     /**
      * Requires the server to be running 1.20.5.
      */
     public static final Prerequisite HAS_1_20_5 = new Prerequisite(
-            () -> ProxyConstants.NMS_VERSION.contains("1_20_") && !ProxyConstants.NMS_VERSION.contains("R"),
+            () -> (ProxyConstants.NMS_VERSION.contains("1_20_") && !ProxyConstants.NMS_VERSION.contains("R"))
+                    || HAS_1_21.isMet(),
             "Requires server to be running 1.20.5+"
     );
 

eco-api/src/main/java/com/willfp/eco/core/display/Display.java

@@ -211,12 +211,22 @@ public final class Display {
                 new ArrayList<>()
         );
 
-        modules.removeIf(it -> it.getPluginName().equalsIgnoreCase(module.getPluginName()));
         modules.add(module);
 
         REGISTERED_MODULES.put(module.getWeight(), modules);
     }
 
+    /**
+     * Unregister a display module.
+     *
+     * @param module The module.
+     */
+    public static void unregisterDisplayModule(@NotNull final DisplayModule module) {
+        for (List<DisplayModule> modules : REGISTERED_MODULES.values()) {
+            modules.remove(module);
+        }
+    }
+
     private Display() {
         throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
     }

eco-api/src/main/java/com/willfp/eco/core/proxy/ProxyConstants.java

@@ -28,7 +28,7 @@ public final class ProxyConstants {
             "v1_20_R1",
             "v1_20_R2",
             "v1_20_R3",
-            "v1_20_6"
+            "v1_21"
     );
 
     private ProxyConstants() {

eco-api/src/main/java/com/willfp/eco/util/DurabilityUtils.java

@@ -158,11 +158,8 @@ public final class DurabilityUtils {
         }
 
         if (item.getItemMeta() instanceof Damageable meta) {
-            meta.setDamage(meta.getDamage() - repair);
+            meta.setDamage(Math.max(0, meta.getDamage() - repair));
 
-            if (meta.getDamage() < 0) {
-                meta.setDamage(0);
-            }
             item.setItemMeta((ItemMeta) meta);
         }
     }

eco-core/core-backend-modern/build.gradle.kts

@@ -0,0 +1,19 @@
+group = "com.willfp"
+version = rootProject.version
+
+dependencies {
+    compileOnly(project(":eco-core:core-backend"))
+    compileOnly("io.papermc.paper:paper-api:1.21-R0.1-SNAPSHOT")
+}
+
+tasks {
+    compileJava {
+        options.release = 21
+    }
+
+    compileKotlin {
+        kotlinOptions {
+            jvmTarget = "21"
+        }
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/entities/ModernEntityArgParsersImpl.kt

@@ -0,0 +1,13 @@
+package com.willfp.eco.internal.compat.modern.entities
+
+import com.willfp.eco.core.entities.Entities
+import com.willfp.eco.internal.compat.modern.entities.parsers.EntityArgParserJumpStrength
+import com.willfp.eco.internal.compat.modern.entities.parsers.EntityArgParserScale
+import com.willfp.eco.internal.entities.ModernEntityArgParsers
+
+class ModernEntityArgParsersImpl: ModernEntityArgParsers {
+    override fun registerAll() {
+        Entities.registerArgParser(EntityArgParserScale)
+        Entities.registerArgParser(EntityArgParserJumpStrength)
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/entities/parsers/EntityArgParserJumpStrength.kt

@@ -1,4 +1,4 @@
-package com.willfp.eco.internal.entities
+package com.willfp.eco.internal.compat.modern.entities.parsers
 
 import com.willfp.eco.core.entities.args.EntityArgParseResult
 import com.willfp.eco.core.entities.args.EntityArgParser
@@ -28,7 +28,7 @@ object EntityArgParserJumpStrength : EntityArgParser {
                     return@EntityArgParseResult false
                 }
 
-                val inst = it.getAttribute(Attribute.HORSE_JUMP_STRENGTH) ?: return@EntityArgParseResult false
+                val inst = it.getAttribute(Attribute.GENERIC_JUMP_STRENGTH) ?: return@EntityArgParseResult false
                 inst.value >= attributeValue
             },
             {
@@ -36,7 +36,7 @@ object EntityArgParserJumpStrength : EntityArgParser {
                     return@EntityArgParseResult
                 }
 
-                it.getAttribute(Attribute.HORSE_JUMP_STRENGTH)?.baseValue = attributeValue
+                it.getAttribute(Attribute.GENERIC_JUMP_STRENGTH)?.baseValue = attributeValue
             }
         )
     }

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/entities/parsers/EntityArgParserScale.kt

@@ -0,0 +1,45 @@
+package com.willfp.eco.internal.compat.modern.entities.parsers
+
+import com.willfp.eco.core.entities.args.EntityArgParseResult
+import com.willfp.eco.core.entities.args.EntityArgParser
+import org.bukkit.attribute.Attribute
+import org.bukkit.entity.LivingEntity
+import org.bukkit.entity.Phantom
+import org.bukkit.entity.Slime
+
+object EntityArgParserScale : EntityArgParser {
+    override fun parseArguments(args: Array<out String>): EntityArgParseResult? {
+        var attributeValue: Double? = null
+
+        for (arg in args) {
+            val argSplit = arg.split(":")
+            if (!argSplit[0].equals("scale", ignoreCase = true)) {
+                continue
+            }
+            if (argSplit.size < 2) {
+                continue
+            }
+            attributeValue = argSplit[1].toDoubleOrNull()
+        }
+
+        attributeValue ?: return null
+
+        return EntityArgParseResult(
+            {
+                if (it !is LivingEntity) {
+                    return@EntityArgParseResult false
+                }
+
+                val inst = it.getAttribute(Attribute.GENERIC_SCALE) ?: return@EntityArgParseResult false
+                inst.value >= attributeValue
+            },
+            {
+                if (it !is LivingEntity) {
+                    return@EntityArgParseResult
+                }
+
+                it.getAttribute(Attribute.GENERIC_SCALE)?.baseValue = attributeValue
+            }
+        )
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/items/ModernItemArgParsersImpl.kt

@@ -0,0 +1,21 @@
+package com.willfp.eco.internal.compat.modern.items
+
+import com.willfp.eco.core.items.Items
+import com.willfp.eco.internal.compat.modern.items.parsers.ArgParserFireResistant
+import com.willfp.eco.internal.compat.modern.items.parsers.ArgParserGlint
+import com.willfp.eco.internal.compat.modern.items.parsers.ArgParserItemName
+import com.willfp.eco.internal.compat.modern.items.parsers.ArgParserMaxDamage
+import com.willfp.eco.internal.compat.modern.items.parsers.ArgParserMaxStackSize
+import com.willfp.eco.internal.compat.modern.items.parsers.ArgParserTrim
+import com.willfp.eco.internal.items.ModernItemArgParsers
+
+class ModernItemArgParsersImpl : ModernItemArgParsers {
+    override fun registerAll() {
+        Items.registerArgParser(ArgParserTrim)
+        Items.registerArgParser(ArgParserFireResistant)
+        Items.registerArgParser(ArgParserGlint)
+        Items.registerArgParser(ArgParserItemName)
+        Items.registerArgParser(ArgParserMaxDamage)
+        Items.registerArgParser(ArgParserMaxStackSize)
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/items/parsers/ArgParserFireResistant.kt

@@ -0,0 +1,14 @@
+package com.willfp.eco.internal.compat.modern.items.parsers
+
+import com.willfp.eco.internal.items.templates.FlagArgParser
+import org.bukkit.inventory.meta.ItemMeta
+
+object ArgParserFireResistant : FlagArgParser("fire_resistant") {
+    override fun apply(meta: ItemMeta) {
+        meta.isFireResistant = true
+    }
+
+    override fun test(meta: ItemMeta): Boolean {
+        return meta.isFireResistant
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/items/parsers/ArgParserGlint.kt

@@ -0,0 +1,14 @@
+package com.willfp.eco.internal.compat.modern.items.parsers
+
+import com.willfp.eco.internal.items.templates.FlagArgParser
+import org.bukkit.inventory.meta.ItemMeta
+
+object ArgParserGlint : FlagArgParser("glint") {
+    override fun apply(meta: ItemMeta) {
+        meta.setEnchantmentGlintOverride(true)
+    }
+
+    override fun test(meta: ItemMeta): Boolean {
+        return meta.hasEnchantmentGlintOverride()
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/items/parsers/ArgParserItemName.kt

@@ -0,0 +1,27 @@
+package com.willfp.eco.internal.compat.modern.items.parsers
+
+import com.willfp.eco.internal.items.templates.ValueArgParser
+import com.willfp.eco.util.StringUtils
+import net.kyori.adventure.text.Component
+import net.kyori.adventure.text.minimessage.MiniMessage
+import org.bukkit.inventory.meta.ItemMeta
+
+object ArgParserItemName : ValueArgParser<Component>("item_name") {
+    override fun parse(arg: String): Component {
+        return StringUtils.formatToComponent(arg)
+    }
+
+    override fun apply(meta: ItemMeta, value: Component) {
+        meta.itemName(value)
+    }
+
+    override fun test(meta: ItemMeta): String? {
+        if (!meta.hasItemName()) {
+            return null
+        }
+
+        val name = MiniMessage.miniMessage().serialize(meta.itemName())
+
+        return name
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/items/parsers/ArgParserMaxDamage.kt

@@ -0,0 +1,31 @@
+package com.willfp.eco.internal.compat.modern.items.parsers
+
+import com.willfp.eco.internal.items.templates.ValueArgParser
+import org.bukkit.inventory.meta.Damageable
+import org.bukkit.inventory.meta.ItemMeta
+
+object ArgParserMaxDamage : ValueArgParser<Int>("max_damage") {
+    override fun parse(arg: String): Int? {
+        return arg.toIntOrNull()
+    }
+
+    override fun apply(meta: ItemMeta, value: Int) {
+        if (meta !is Damageable) {
+            return
+        }
+
+        meta.setMaxDamage(value)
+    }
+
+    override fun test(meta: ItemMeta): String? {
+        if (meta !is Damageable) {
+            return null
+        }
+
+        if (!meta.hasMaxDamage()) {
+            return null
+        }
+
+        return meta.maxDamage.toString()
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/items/parsers/ArgParserMaxStackSize.kt

@@ -0,0 +1,22 @@
+package com.willfp.eco.internal.compat.modern.items.parsers
+
+import com.willfp.eco.internal.items.templates.ValueArgParser
+import org.bukkit.inventory.meta.ItemMeta
+
+object ArgParserMaxStackSize : ValueArgParser<Int>("max_stack_size") {
+    override fun parse(arg: String): Int? {
+        return arg.toIntOrNull()
+    }
+
+    override fun apply(meta: ItemMeta, value: Int) {
+        meta.setMaxStackSize(value)
+    }
+
+    override fun test(meta: ItemMeta): String? {
+        if (!meta.hasMaxStackSize()) {
+            return null
+        }
+
+        return meta.maxStackSize.toString()
+    }
+}

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/items/parsers/ArgParserTrim.kt

@@ -1,4 +1,4 @@
-package com.willfp.eco.internal.items
+package com.willfp.eco.internal.compat.modern.items.parsers
 
 import com.willfp.eco.core.items.args.LookupArgParser
 import org.bukkit.NamespacedKey
@@ -23,7 +23,11 @@ object ArgParserTrim : LookupArgParser {
             if (!argSplit[0].equals("trim", ignoreCase = true)) {
                 continue
             }
+
+            @Suppress("DEPRECATION")
             material = Registry.TRIM_MATERIAL.get(NamespacedKey.minecraft(argSplit.getOrElse(1) {""}))
+
+            @Suppress("DEPRECATION")
             pattern = Registry.TRIM_PATTERN.get(NamespacedKey.minecraft(argSplit.getOrElse(2) {""}))
         }
 
@@ -43,6 +47,11 @@ object ArgParserTrim : LookupArgParser {
     override fun serializeBack(meta: ItemMeta): String? {
         val trim = (meta as? ArmorMeta)?.trim ?: return null
 
-        return "trim:${trim.material.key.key.lowercase()}:${trim.pattern.key.key.lowercase()}"
+        @Suppress("DEPRECATION")
+        val materialKey = Registry.TRIM_MATERIAL.getKey(trim.material) ?: return null
+        @Suppress("DEPRECATION")
+        val patternKey = Registry.TRIM_PATTERN.getKey(trim.pattern) ?: return null
+
+        return "trim:${materialKey.key.lowercase()}:${patternKey.key.lowercase()}"
     }
 }

eco-core/core-backend-modern/src/main/kotlin/com/willfp/eco/internal/compat/modern/recipes/AutocrafterPatchImpl.kt

@@ -0,0 +1,19 @@
+@file:Suppress("UnstableApiUsage")
+
+package com.willfp.eco.internal.compat.modern.recipes
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.internal.recipes.AutocrafterPatch
+import org.bukkit.event.EventHandler
+import org.bukkit.event.block.CrafterCraftEvent
+
+class AutocrafterPatchImpl: AutocrafterPatch {
+    @EventHandler
+    fun preventEcoRecipes(event: CrafterCraftEvent) {
+        if (!EcoPlugin.getPluginNames().contains(event.recipe.key.namespace)) {
+            return
+        }
+
+        event.isCancelled = true
+    }
+}

eco-core/core-backend/build.gradle.kts

@@ -13,3 +13,15 @@ dependencies {
     compileOnly("org.yaml:snakeyaml:1.33")
     compileOnly("com.moandjiezana.toml:toml4j:0.7.2")
 }
+
+tasks {
+    compileJava {
+        options.release = 17
+    }
+
+    compileKotlin {
+        kotlinOptions {
+            jvmTarget = "17"
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/command/HandledCommand.kt

@@ -126,14 +126,19 @@ abstract class HandledCommand(
      * @return The tab completion results.
      */
     private fun CommandBase.handleTabComplete(sender: CommandSender, args: List<String>): List<String> {
-        if (!sender.hasPermission(permission)) return emptyList()
+        if (!sender.hasPermission(permission)) {
+            return emptyList()
+        }
 
         if (args.size == 1) {
-            val completions = subcommands.filter { sender.hasPermission(it.permission) }.map { it.name }
+            val completions = mutableListOf<String>()
 
-            val list = mutableListOf<String>()
+            StringUtil.copyPartialMatches(
+                args[0],
+                subcommands.filter { sender.hasPermission(it.permission) }.map { it.name },
+                completions
+            )
 
-            StringUtil.copyPartialMatches(args[0], completions, list)
             if (completions.isNotEmpty()) {
                 return completions
             }
@@ -156,9 +161,11 @@ abstract class HandledCommand(
         }
 
         val completions = tabComplete(sender, args).toMutableList()
+
         if (sender is Player) {
             completions.addAll(tabComplete(sender, args))
         }
+
         return completions.sorted()
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/compat/ModernCompatibility.kt

@@ -0,0 +1,68 @@
+package com.willfp.eco.internal.compat
+
+import com.willfp.eco.core.Prerequisite
+import com.willfp.eco.core.proxy.exceptions.ProxyError
+
+private const val BASE_PACKAGE = "com.willfp.eco.internal.compat.modern"
+private val isModern = Prerequisite.HAS_PAPER.isMet && Prerequisite.HAS_1_21.isMet
+
+internal annotation class ModernCompatibilityProxy(
+    val location: String
+)
+
+private val cache = mutableMapOf<Class<*>, Any>()
+
+object ModernCompatibilityScope {
+    inline fun <reified T> loadProxy(): T {
+        return loadCompatibilityProxy(T::class.java)
+    }
+
+    inline fun <reified T> useProxy(block: T.() -> Any?) {
+        val proxy = loadProxy<T>()
+
+        with(proxy) {
+            block()
+        }
+    }
+}
+
+fun <R> ifModern(block: ModernCompatibilityScope.() -> R) {
+    if (!isModern) {
+        return
+    }
+
+    block(ModernCompatibilityScope)
+}
+
+fun <T> loadCompatibilityProxy(clazz: Class<T>): T {
+    @Suppress("UNCHECKED_CAST")
+    return cache.getOrPut(clazz) {
+        loadProxyUncached(clazz)
+    } as T
+}
+
+private fun loadProxyUncached(clazz: Class<*>): Any {
+    val proxy = clazz.getAnnotation(ModernCompatibilityProxy::class.java)
+    val location = proxy?.location ?: throw IllegalArgumentException("Class ${clazz.name} is not a proxy")
+    val className = "$BASE_PACKAGE.$location"
+
+    try {
+        val found = Class.forName(className)
+
+        val constructor = found.getConstructor()
+        val instance = constructor.newInstance()
+
+        if (!clazz.isInstance(instance)) {
+            throw ProxyError(
+                "Modern compatibility proxy class $className does not implement ${clazz.name}",
+                ClassCastException()
+            )
+        }
+
+        return instance
+    } catch (e: ClassNotFoundException) {
+        throw ProxyError("Could not find modern compatibility proxy class $className", e)
+    } catch (e: NoSuchMethodException) {
+        throw ProxyError("Could not find no-args constructor for modern compatibility proxy class $className", e)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/entities/ModernEntityArgParsers.kt

@@ -0,0 +1,8 @@
+package com.willfp.eco.internal.entities
+
+import com.willfp.eco.internal.compat.ModernCompatibilityProxy
+
+@ModernCompatibilityProxy("entities.ModernEntityArgParsersImpl")
+interface ModernEntityArgParsers {
+    fun registerAll()
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/RenderedInventory.kt

@@ -1,5 +1,7 @@
 package com.willfp.eco.internal.gui.menu
 
+import com.willfp.eco.core.Eco
+import com.willfp.eco.core.Prerequisite
 import com.willfp.eco.core.gui.menu.events.CaptiveItemChangeEvent
 import com.willfp.eco.core.items.isEcoEmpty
 import com.willfp.eco.core.recipe.parts.EmptyTestableItem
@@ -20,9 +22,23 @@ fun Player.forceRenderedInventory(menu: RenderedInventory) {
     trackedForceRendered[this.uniqueId] = menu
 }
 
+// Workaround because 1.21 has OpenInventory as an interface instead of an abstract class like in previous versions
+interface TopInventoryProxy {
+    fun getTopInventory(player: Player): Inventory
+}
+
+private val Player.topInventory: Inventory
+    get() {
+        return if (!Prerequisite.HAS_1_21.isMet) {
+            Eco.get().ecoPlugin.getProxy(TopInventoryProxy::class.java).getTopInventory(this)
+        } else {
+            this.openInventory.topInventory
+        }
+    }
+
 val Player.renderedInventory: RenderedInventory?
     get() = trackedForceRendered[this.uniqueId]
-        ?: this.openInventory.topInventory.asRenderedInventory()
+        ?: this.topInventory.asRenderedInventory()
 
 class RenderedInventory(
     val menu: EcoMenu,

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserEnchantment.kt

@@ -20,6 +20,7 @@ object ArgParserEnchantment : LookupArgParser {
                 continue
             }
 
+            @Suppress("DEPRECATION")
             val enchant = Enchantment.getByKey(NamespacedKeyUtils.create("minecraft", argSplit[0]))
             val level = argSplit[1].toIntOrNull()
 

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserName.kt

@@ -1,44 +1,30 @@
 package com.willfp.eco.internal.items
 
-import com.willfp.eco.core.items.args.LookupArgParser
+import com.willfp.eco.internal.items.templates.ValueArgParser
 import com.willfp.eco.util.StringUtils
 import org.bukkit.inventory.ItemStack
 import org.bukkit.inventory.meta.ItemMeta
 import java.util.function.Predicate
 
-object ArgParserName : LookupArgParser {
+object ArgParserName : ValueArgParser<String>("name") {
-    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+    override fun parse(arg: String): String {
-        var name: String? = null
+        return arg
-
-        for (arg in args) {
-            if (!arg.lowercase().startsWith("name:")) {
-                continue
-            }
-            name = arg.substring(5, arg.length)
     }
 
-        name ?: return null
+    override fun apply(meta: ItemMeta, value: String) {
-
+        val formatted = StringUtils.format(value)
-        val formatted = StringUtils.format(name)
 
         // I don't know why it says it's redundant, the compiler yells at me
         @Suppress("UsePropertyAccessSyntax", "RedundantSuppression", "DEPRECATION")
         meta.setDisplayName(formatted)
-
-        return Predicate {
-            val testMeta = it.itemMeta ?: return@Predicate false
-
-            @Suppress("DEPRECATION")
-            testMeta.displayName == formatted
-        }
     }
 
-    override fun serializeBack(meta: ItemMeta): String? {
+    override fun test(meta: ItemMeta): String? {
         if (!meta.hasDisplayName()) {
             return null
         }
 
         @Suppress("DEPRECATION")
-        return "name:\"${meta.displayName}\""
+        return meta.displayName
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserUnbreakable.kt

@@ -1,38 +1,14 @@
 package com.willfp.eco.internal.items
 
-import com.willfp.eco.core.items.args.LookupArgParser
+import com.willfp.eco.internal.items.templates.FlagArgParser
-import org.bukkit.inventory.ItemStack
 import org.bukkit.inventory.meta.ItemMeta
-import java.util.function.Predicate
-
-object ArgParserUnbreakable : LookupArgParser {
-    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
-        var unbreakable = false
-
-        for (arg in args) {
-            if (arg.equals("unbreakable", true)) {
-                unbreakable = true
-            }
-        }
-
-        if (!unbreakable) {
-            return null
-        }
 
+object ArgParserUnbreakable : FlagArgParser("unbreakable") {
+    override fun apply(meta: ItemMeta) {
         meta.isUnbreakable = true
-
-        return Predicate {
-            val testMeta = it.itemMeta ?: return@Predicate false
-
-            testMeta.isUnbreakable
-        }
     }
 
-    override fun serializeBack(meta: ItemMeta): String? {
+    override fun test(meta: ItemMeta): Boolean {
-        if (!meta.isUnbreakable) {
+        return meta.isUnbreakable
-            return null
-        }
-
-        return "unbreakable"
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ModernItemArgParsers.kt

@@ -0,0 +1,8 @@
+package com.willfp.eco.internal.items
+
+import com.willfp.eco.internal.compat.ModernCompatibilityProxy
+
+@ModernCompatibilityProxy("items.ModernItemArgParsersImpl")
+interface ModernItemArgParsers {
+    fun registerAll()
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/templates/FlagArgParser.kt

@@ -0,0 +1,44 @@
+package com.willfp.eco.internal.items.templates
+
+import com.willfp.eco.core.items.args.LookupArgParser
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+import java.util.function.Predicate
+
+abstract class FlagArgParser(
+    protected val flag: String
+) : LookupArgParser {
+    abstract fun apply(meta: ItemMeta)
+
+    abstract fun test(meta: ItemMeta): Boolean
+
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        var has = false
+
+        for (arg in args) {
+            if (arg.equals(flag, true)) {
+                has = true
+            }
+        }
+
+        if (!has) {
+            return null
+        }
+
+        apply(meta)
+
+        return Predicate {
+            val testMeta = it.itemMeta ?: return@Predicate false
+
+            test(testMeta)
+        }
+    }
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        if (!test(meta)) {
+            return null
+        }
+
+        return flag
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/templates/ValueArgParser.kt

@@ -0,0 +1,50 @@
+package com.willfp.eco.internal.items.templates
+
+import com.willfp.eco.core.items.args.LookupArgParser
+import com.willfp.eco.util.StringUtils
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+import java.util.function.Predicate
+
+abstract class ValueArgParser<T: Any>(
+    protected val flag: String
+) : LookupArgParser {
+    abstract fun parse(arg: String): T?
+
+    abstract fun apply(meta: ItemMeta, value: T)
+
+    abstract fun test(meta: ItemMeta): String?
+
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        var argument: String? = null
+
+        for (arg in args) {
+            if (!arg.lowercase().startsWith("${flag}:")) {
+                continue
+            }
+            argument = arg.substring(flag.length + 1, arg.length)
+        }
+
+        argument ?: return null
+
+        val parsed = parse(argument) ?: return null
+
+        apply(meta, parsed)
+
+        return Predicate {
+            val testMeta = it.itemMeta ?: return@Predicate false
+
+            test(testMeta) == parsed
+        }
+    }
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        val test = test(meta)
+
+        if (test.isNullOrBlank()) {
+            return null
+        }
+
+        return "${flag}:\"$test\""
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/particle/ParticleFactoryRGB.kt

@@ -1,5 +1,6 @@
 package com.willfp.eco.internal.particle
 
+import com.willfp.eco.core.Prerequisite
 import com.willfp.eco.core.particle.ParticleFactory
 import com.willfp.eco.core.particle.SpawnableParticle
 import org.bukkit.Color
@@ -7,6 +8,14 @@ import org.bukkit.Location
 import org.bukkit.Particle
 
 object ParticleFactoryRGB : ParticleFactory {
+    private val dustParticle = runCatching {
+        if (Prerequisite.HAS_1_20_5.isMet) {
+            Particle.valueOf("DUST")
+        } else {
+            Particle.valueOf("REDSTONE")
+        }
+    }.getOrNull()
+
     override fun getNames() = listOf(
         "color",
         "rgb",
@@ -30,7 +39,9 @@ object ParticleFactoryRGB : ParticleFactory {
         override fun spawn(location: Location, amount: Int) {
             val world = location.world ?: return
 
-            world.spawnParticle(Particle.REDSTONE, location, amount, 0.0, 0.0, 0.0, 0.0, options)
+            val particle = dustParticle ?: return
+
+            world.spawnParticle(particle, location, amount, 0.0, 0.0, 0.0, 0.0, options)
         }
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/price/PriceFactoryXP.kt

@@ -8,6 +8,11 @@ import org.bukkit.entity.Player
 import java.util.UUID
 import kotlin.math.roundToInt
 
+private fun getXPNeededForLevel(level: Int): Int {
+    // XP Formula from NMS Player
+    return if (level >= 30) 112 + (level - 30) * 9 else (if (level >= 15) 37 + (level - 15) * 5 else 7 + level * 2)
+}
+
 object PriceFactoryXP : PriceFactory {
     override fun getNames() = listOf(
         "xp",
@@ -25,15 +30,37 @@ object PriceFactoryXP : PriceFactory {
     ) : Price {
         private val multipliers = mutableMapOf<UUID, Double>()
 
-        override fun canAfford(player: Player, multiplier: Double): Boolean =
+        override fun canAfford(player: Player, multiplier: Double): Boolean {
-            player.totalExperience >= getValue(player, multiplier)
+            var totalExperience = 0
+            for (level in 0 until player.level) {
+                totalExperience += getXPNeededForLevel(level)
+            }
+
+            totalExperience += (player.exp * getXPNeededForLevel(player.level)).toInt()
+
+            return totalExperience >= getValue(player, multiplier).roundToInt()
+        }
 
         override fun pay(player: Player, multiplier: Double) {
-            player.totalExperience -= getValue(player, multiplier).roundToInt()
+            takeXP(player, getValue(player, multiplier).roundToInt())
+        }
+
+        private fun takeXP(player: Player, amount: Int) {
+            val currentLevel = player.level
+            val currentExp = player.exp * getXPNeededForLevel(currentLevel)
+
+            if (currentExp >= amount) {
+                player.exp = (currentExp - amount) / getXPNeededForLevel(currentLevel)
+            } else {
+                // Handle recursive level down
+                player.exp = 1f
+                player.level = (currentLevel - 1).coerceAtLeast(0)
+                takeXP(player, (amount - currentExp).toInt())
+            }
         }
 
         override fun giveTo(player: Player, multiplier: Double) {
-            player.totalExperience += getValue(player, multiplier).roundToInt()
+            player.giveExp(getValue(player, multiplier).roundToInt())
         }
 
         override fun getValue(player: Player, multiplier: Double): Double {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/recipes/AutocrafterPatch.kt

@@ -0,0 +1,7 @@
+package com.willfp.eco.internal.recipes
+
+import com.willfp.eco.internal.compat.ModernCompatibilityProxy
+import org.bukkit.event.Listener
+
+@ModernCompatibilityProxy("recipes.AutocrafterPatchImpl")
+interface AutocrafterPatch: Listener

eco-core/core-nms/common/build.gradle.kts

@@ -7,4 +7,11 @@ version = rootProject.version
 
 dependencies {
     paperweight.paperDevBundle("1.17.1-R0.1-SNAPSHOT")
+    pluginRemapper("net.fabricmc:tiny-remapper:0.10.3:fat")
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
 }

eco-core/core-nms/common/src/main/kotlin/com/willfp/eco/internal/spigot/proxy/common/item/EcoFastItemStack.kt

@@ -85,11 +85,19 @@ class EcoFastItemStack(
     override fun setLoreComponents(lore: List<Component>?) {
         val jsonLore = mutableListOf<String>()
 
-        if (lore != null) {
+        if (lore.isNullOrEmpty()) {
+            val element = handle.getOrCreateTagElement("display")
+            element.remove("Lore")
+            if (element.isEmpty) {
+                handle.removeTagKey("display")
+            }
+            apply()
+            return
+        }
+
         for (s in lore) {
             jsonLore.add(StringUtils.componentToJson(s))
         }
-        }
 
         val displayTag = handle.getOrCreateTagElement("display")
 

eco-core/core-nms/modern/build.gradle.kts

@@ -0,0 +1,23 @@
+plugins {
+    id("io.papermc.paperweight.userdev")
+}
+
+group = "com.willfp"
+version = rootProject.version
+
+dependencies {
+    compileOnly(project(":eco-core:core-nms:common"))
+    paperweight.paperDevBundle("1.21-R0.1-SNAPSHOT")
+}
+
+tasks {
+    compileJava {
+        options.release = 21
+    }
+
+    compileKotlin {
+        kotlinOptions {
+            jvmTarget = "21"
+        }
+    }
+}

eco-core/core-nms/modern/src/main/kotlin/com/willfp/eco/internal/spigot/proxy/common/modern/NewEcoFastItemStack.kt

@@ -0,0 +1,414 @@
+package com.willfp.eco.internal.spigot.proxy.common.modern
+
+import com.willfp.eco.internal.spigot.proxy.common.asNMSStack
+import com.willfp.eco.internal.spigot.proxy.common.item.ContinuallyAppliedPersistentDataContainer
+import com.willfp.eco.internal.spigot.proxy.common.item.ImplementedFIS
+import com.willfp.eco.internal.spigot.proxy.common.makePdc
+import com.willfp.eco.internal.spigot.proxy.common.mergeIfNeeded
+import com.willfp.eco.internal.spigot.proxy.common.setPdc
+import com.willfp.eco.internal.spigot.proxy.common.toAdventure
+import com.willfp.eco.internal.spigot.proxy.common.toItem
+import com.willfp.eco.internal.spigot.proxy.common.toMaterial
+import com.willfp.eco.internal.spigot.proxy.common.toNMS
+import com.willfp.eco.util.StringUtils
+import com.willfp.eco.util.toComponent
+import com.willfp.eco.util.toLegacy
+import net.kyori.adventure.text.Component
+import net.kyori.adventure.text.format.Style
+import net.kyori.adventure.text.format.TextColor
+import net.kyori.adventure.text.format.TextDecoration
+import net.minecraft.core.component.DataComponentType
+import net.minecraft.core.component.DataComponents
+import net.minecraft.core.registries.Registries
+import net.minecraft.nbt.CompoundTag
+import net.minecraft.util.Unit
+import net.minecraft.world.item.component.CustomData
+import net.minecraft.world.item.component.CustomModelData
+import net.minecraft.world.item.component.ItemLore
+import org.bukkit.Bukkit
+import org.bukkit.craftbukkit.CraftRegistry
+import org.bukkit.craftbukkit.CraftServer
+import org.bukkit.craftbukkit.enchantments.CraftEnchantment
+import org.bukkit.enchantments.Enchantment
+import org.bukkit.inventory.ItemFlag
+import org.bukkit.inventory.ItemStack
+import org.bukkit.persistence.PersistentDataContainer
+import kotlin.math.max
+
+private val unstyledComponent = Component.empty().style {
+    it.color(null).decoration(TextDecoration.ITALIC, false)
+}
+
+private fun Component.unstyled(): Component {
+    return unstyledComponent.append(this)
+}
+
+class NewEcoFastItemStack(
+    private val bukkit: ItemStack
+) : ImplementedFIS {
+    // Cast is there because, try as I might, I can't get IntellIJ to recognise half the classes in the dev bundle
+    @Suppress("USELESS_CAST")
+    private val handle = bukkit.asNMSStack() as net.minecraft.world.item.ItemStack
+
+    private val pdc = (handle.get(DataComponents.CUSTOM_DATA)?.copyTag() ?: CompoundTag()).makePdc()
+
+    override fun getEnchants(checkStored: Boolean): Map<Enchantment, Int> {
+        val enchantments = handle.get(DataComponents.ENCHANTMENTS) ?: return emptyMap()
+
+        val map = mutableMapOf<Enchantment, Int>()
+
+        for ((enchantment, level) in enchantments.entrySet()) {
+            val bukkit = CraftEnchantment.minecraftToBukkit(enchantment.value())
+
+            map[bukkit] = level
+        }
+
+        if (checkStored) {
+            val stored = handle.get(DataComponents.STORED_ENCHANTMENTS) ?: return map
+
+            for ((enchantment, level) in stored.entrySet()) {
+                val bukkit = CraftEnchantment.minecraftToBukkit(enchantment.value())
+
+                map[bukkit] = max(map.getOrDefault(bukkit, 0), level)
+            }
+        }
+
+        return map
+    }
+
+    override fun getEnchantmentLevel(
+        enchantment: Enchantment,
+        checkStored: Boolean
+    ): Int {
+        val minecraft =
+            CraftRegistry.bukkitToMinecraft<Enchantment, net.minecraft.world.item.enchantment.Enchantment>(
+                enchantment
+            )
+
+        val server = Bukkit.getServer() as CraftServer
+        val access = server.server.registryAccess()
+
+        val holder = access.registryOrThrow(Registries.ENCHANTMENT).wrapAsHolder(minecraft)
+
+        val enchantments = handle.get(DataComponents.ENCHANTMENTS) ?: return 0
+        var level = enchantments.getLevel(holder)
+
+        if (checkStored) {
+            val storedEnchantments = handle.get(DataComponents.STORED_ENCHANTMENTS) ?: return 0
+            level = max(level, storedEnchantments.getLevel(holder))
+        }
+
+        return level
+    }
+
+    override fun setLore(lore: List<String>?) = setLoreComponents(lore?.map { it.toComponent() })
+
+    override fun setLoreComponents(lore: List<Component>?) {
+        if (lore == null) {
+            handle.set<ItemLore>(DataComponents.LORE, null)
+        } else {
+            val components = lore
+                .map { it.unstyled() }
+                .map { it.toNMS() }
+
+            handle.set(
+                DataComponents.LORE, ItemLore(
+                    components,
+                    components
+                )
+            )
+        }
+
+        apply()
+    }
+
+    override fun getLoreComponents(): List<Component> {
+        return handle.get(DataComponents.LORE)?.lines?.map { it.toAdventure() } ?: emptyList()
+    }
+
+    override fun getLore(): List<String> =
+        getLoreComponents().map { StringUtils.toLegacy(it) }
+
+    override fun setDisplayName(name: Component?) {
+        if (name == null) {
+            handle.set<net.minecraft.network.chat.Component>(DataComponents.ITEM_NAME, null)
+            handle.set<net.minecraft.network.chat.Component>(DataComponents.CUSTOM_NAME, null)
+        } else {
+            handle.set(
+                DataComponents.CUSTOM_NAME,
+                name.unstyled().toNMS()
+            )
+        }
+
+        apply()
+    }
+
+    override fun setDisplayName(name: String?) = setDisplayName(name?.toComponent())
+
+    override fun getDisplayNameComponent(): Component {
+        return handle.get(DataComponents.CUSTOM_NAME)?.toAdventure()
+            ?: handle.get(DataComponents.ITEM_NAME)?.toAdventure()
+            ?: Component.translatable(bukkit.type.toItem().descriptionId)
+    }
+
+    override fun getDisplayName(): String = displayNameComponent.toLegacy()
+
+    private fun <T> net.minecraft.world.item.ItemStack.modifyComponent(
+        component: DataComponentType<T>,
+        modifier: (T) -> T
+    ) {
+        val current = handle.get(component) ?: return
+        this.set(component, modifier(current))
+    }
+
+    override fun addItemFlags(vararg hideFlags: ItemFlag) {
+        for (flag in hideFlags) {
+            when (flag) {
+                ItemFlag.HIDE_ENCHANTS -> {
+                    handle.modifyComponent(DataComponents.ENCHANTMENTS) { enchantments ->
+                        enchantments.withTooltip(false)
+                    }
+                }
+
+                ItemFlag.HIDE_ATTRIBUTES -> {
+                    handle.modifyComponent(DataComponents.ATTRIBUTE_MODIFIERS) { attributes ->
+                        attributes.withTooltip(false)
+                    }
+                }
+
+                ItemFlag.HIDE_UNBREAKABLE -> {
+                    handle.modifyComponent(DataComponents.UNBREAKABLE) { unbreakable ->
+                        unbreakable.withTooltip(false)
+                    }
+                }
+
+                ItemFlag.HIDE_DESTROYS -> {
+                    handle.modifyComponent(DataComponents.CAN_BREAK) { destroys ->
+                        destroys.withTooltip(false)
+                    }
+                }
+
+                ItemFlag.HIDE_PLACED_ON -> {
+                    handle.modifyComponent(DataComponents.CAN_PLACE_ON) { placedOn ->
+                        placedOn.withTooltip(false)
+                    }
+                }
+
+                ItemFlag.HIDE_ADDITIONAL_TOOLTIP -> {
+                    handle.set(DataComponents.HIDE_ADDITIONAL_TOOLTIP, Unit.INSTANCE)
+                }
+
+                ItemFlag.HIDE_DYE -> {
+                    handle.modifyComponent(DataComponents.DYED_COLOR) { dyed ->
+                        dyed.withTooltip(false)
+                    }
+                }
+
+                ItemFlag.HIDE_ARMOR_TRIM -> {
+                    handle.modifyComponent(DataComponents.TRIM) { trim ->
+                        trim.withTooltip(false)
+                    }
+                }
+
+                ItemFlag.HIDE_STORED_ENCHANTS -> {
+                    handle.modifyComponent(DataComponents.STORED_ENCHANTMENTS) { storedEnchants ->
+                        storedEnchants.withTooltip(false)
+                    }
+                }
+            }
+        }
+
+        apply()
+    }
+
+    override fun removeItemFlags(vararg hideFlags: ItemFlag) {
+        for (flag in hideFlags) {
+            when (flag) {
+                ItemFlag.HIDE_ENCHANTS -> {
+                    handle.modifyComponent(DataComponents.ENCHANTMENTS) { enchantments ->
+                        enchantments.withTooltip(true)
+                    }
+                }
+
+                ItemFlag.HIDE_ATTRIBUTES -> {
+                    handle.modifyComponent(DataComponents.ATTRIBUTE_MODIFIERS) { attributes ->
+                        attributes.withTooltip(true)
+                    }
+                }
+
+                ItemFlag.HIDE_UNBREAKABLE -> {
+                    handle.modifyComponent(DataComponents.UNBREAKABLE) { unbreakable ->
+                        unbreakable.withTooltip(true)
+                    }
+                }
+
+                ItemFlag.HIDE_DESTROYS -> {
+                    handle.modifyComponent(DataComponents.CAN_BREAK) { destroys ->
+                        destroys.withTooltip(true)
+                    }
+                }
+
+                ItemFlag.HIDE_PLACED_ON -> {
+                    handle.modifyComponent(DataComponents.CAN_PLACE_ON) { placedOn ->
+                        placedOn.withTooltip(true)
+                    }
+                }
+
+                ItemFlag.HIDE_ADDITIONAL_TOOLTIP -> {
+                    handle.remove(DataComponents.HIDE_ADDITIONAL_TOOLTIP)
+                }
+
+                ItemFlag.HIDE_DYE -> {
+                    handle.modifyComponent(DataComponents.DYED_COLOR) { dyed ->
+                        dyed.withTooltip(true)
+                    }
+                }
+
+                ItemFlag.HIDE_ARMOR_TRIM -> {
+                    handle.modifyComponent(DataComponents.TRIM) { trim ->
+                        trim.withTooltip(true)
+                    }
+                }
+
+                ItemFlag.HIDE_STORED_ENCHANTS -> {
+                    handle.modifyComponent(DataComponents.STORED_ENCHANTMENTS) { storedEnchants ->
+                        storedEnchants.withTooltip(true)
+                    }
+                }
+            }
+        }
+
+        apply()
+    }
+
+    override fun getItemFlags(): Set<ItemFlag> {
+        val currentFlags = mutableSetOf<ItemFlag>()
+        for (f in ItemFlag.entries) {
+            if (hasItemFlag(f)) {
+                currentFlags.add(f)
+            }
+        }
+        return currentFlags
+    }
+
+    override fun hasItemFlag(flag: ItemFlag): Boolean {
+        return when (flag) {
+            ItemFlag.HIDE_ENCHANTS -> {
+                val enchantments = handle.get(DataComponents.ENCHANTMENTS) ?: return false
+                !enchantments.showInTooltip
+            }
+
+            ItemFlag.HIDE_ATTRIBUTES -> {
+                val attributes = handle.get(DataComponents.ATTRIBUTE_MODIFIERS) ?: return false
+                !attributes.showInTooltip
+            }
+
+            ItemFlag.HIDE_UNBREAKABLE -> {
+                val unbreakable = handle.get(DataComponents.UNBREAKABLE) ?: return false
+                !unbreakable.showInTooltip
+            }
+
+            ItemFlag.HIDE_DESTROYS -> {
+                val destroys = handle.get(DataComponents.CAN_BREAK) ?: return false
+                !destroys.showInTooltip()
+            }
+
+            ItemFlag.HIDE_PLACED_ON -> {
+                val placedOn = handle.get(DataComponents.CAN_PLACE_ON) ?: return false
+                !placedOn.showInTooltip()
+            }
+
+            ItemFlag.HIDE_ADDITIONAL_TOOLTIP -> {
+                handle.get(DataComponents.HIDE_ADDITIONAL_TOOLTIP) != null
+            }
+
+            ItemFlag.HIDE_DYE -> {
+                val dyed = handle.get(DataComponents.DYED_COLOR) ?: return false
+                !dyed.showInTooltip()
+            }
+
+            ItemFlag.HIDE_ARMOR_TRIM -> {
+                val armorTrim = handle.get(DataComponents.TRIM) ?: return false
+                !armorTrim.showInTooltip
+            }
+
+            ItemFlag.HIDE_STORED_ENCHANTS -> {
+                val storedEnchants = handle.get(DataComponents.STORED_ENCHANTMENTS) ?: return false
+                !storedEnchants.showInTooltip
+            }
+        }
+    }
+
+    override fun getRepairCost(): Int {
+        return handle.get(DataComponents.REPAIR_COST) ?: 0
+    }
+
+    override fun setRepairCost(cost: Int) {
+        handle.set(DataComponents.REPAIR_COST, cost)
+
+        apply()
+    }
+
+    override fun getPersistentDataContainer(): PersistentDataContainer {
+        return ContinuallyAppliedPersistentDataContainer(this.pdc, this)
+    }
+
+    override fun getAmount(): Int = handle.getCount()
+
+    override fun setAmount(amount: Int) {
+        handle.setCount(amount)
+        apply()
+    }
+
+    override fun setType(material: org.bukkit.Material) {
+        @Suppress("DEPRECATION")
+        handle.setItem(material.toItem())
+        apply()
+    }
+
+    override fun getType(): org.bukkit.Material = handle.getItem().toMaterial()
+
+    override fun getCustomModelData(): Int? =
+        handle.get(DataComponents.CUSTOM_MODEL_DATA)?.value
+
+    override fun setCustomModelData(data: Int?) {
+        if (data == null) {
+            handle.remove(DataComponents.CUSTOM_MODEL_DATA)
+        } else {
+            handle.set(DataComponents.CUSTOM_MODEL_DATA, CustomModelData(data))
+        }
+
+        apply()
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (other !is NewEcoFastItemStack) {
+            return false
+        }
+
+        return other.hashCode() == this.hashCode()
+    }
+
+    override fun hashCode(): Int {
+        return net.minecraft.world.item.ItemStack.hashItemAndComponents(handle)
+    }
+
+    override fun apply() {
+        val customData = handle.getOrDefault(DataComponents.CUSTOM_DATA, CustomData.EMPTY)
+        val updated = customData.update {
+            it.setPdc(pdc)
+        }
+
+        if (updated.isEmpty) {
+            handle.remove(DataComponents.CUSTOM_DATA)
+        } else {
+            handle.set(DataComponents.CUSTOM_DATA, updated)
+        }
+
+        bukkit.mergeIfNeeded(handle)
+    }
+
+    override fun unwrap(): ItemStack {
+        return bukkit
+    }
+}

eco-core/core-nms/v1_17_R1/build.gradle.kts

@@ -6,8 +6,9 @@ group = "com.willfp"
 version = rootProject.version
 
 dependencies {
-    implementation(project(":eco-core:core-nms:nms-common"))
+    implementation(project(":eco-core:core-nms:common"))
     paperweight.paperDevBundle("1.17.1-R0.1-SNAPSHOT")
+    pluginRemapper("net.fabricmc:tiny-remapper:0.10.3:fat")
 
     implementation("net.kyori:adventure-text-minimessage:4.2.0-SNAPSHOT") {
         version {
@@ -37,3 +38,9 @@ tasks {
         )
     }
 }
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}

eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/internal/spigot/proxy/v1_17_R1/TopInventory.kt

@@ -0,0 +1,11 @@
+package com.willfp.eco.internal.spigot.proxy.v1_17_R1
+
+import com.willfp.eco.internal.gui.menu.TopInventoryProxy
+import org.bukkit.entity.Player
+import org.bukkit.inventory.Inventory
+
+class TopInventory: TopInventoryProxy {
+    override fun getTopInventory(player: Player): Inventory {
+        return player.openInventory.topInventory
+    }
+}