Cleaned up BentoBox

# Conflicts:
#	eco-core/core-plugin/build.gradle

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "gradle" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "daily"

README.md

@@ -1,6 +1,6 @@
 <h1 align="center">
   <br>
-  <img src="https://i.imgur.com/p5uR2Qp.png" alt="eco logo" width="256">
+  <img src="https://i.imgur.com/kU3ejCt.png" alt="eco logo" width="256">
   <br>
 </h1>
 
@@ -16,7 +16,7 @@
 # Information for development
 
 ## Javadoc
-The 6.0.0 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.0.0/javadoc/)
+The 6.8.0 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.8.0/javadoc/)
 
 ## Plugin Information
 
@@ -31,7 +31,6 @@ depend:
 eco is available from any of these places:
 
 - [GitHub](https://github.com/Auxilor/eco/releases)
-- [Spigot](https://www.spigotmc.org/resources/eco.87955/)
 - [Polymart](https://polymart.org/resource/eco.773)
 - [Build it locally](https://github.com/Auxilor/eco#build-locally).
 
@@ -72,7 +71,7 @@ Maven:
 </dependency>
 ```
 
-Replace `Tag` with a release tag for eco, eg `6.0.0`.
+Replace `Tag` with a release tag for eco, eg `6.8.0`.
 
 ## Build locally:
 
@@ -158,7 +157,7 @@ Here's a list of some (not all) of the features of eco:
 
 <h1 align="center">
   <br>
-    <a href="http://gamersupps.gg/discount/Auxilor?afmc=Auxilor" target="_blank">
+    <a href="https://gamersupps.gg/discount/Auxilor?afmc=Auxilor" target="_blank">
       <img src="https://i.imgur.com/uFDpBAC.png" alt="supps banner">
     </a>
     <a href="https://dedimc.promo/Auxilor" target="_blank">

build.gradle

@@ -25,11 +25,14 @@ allprojects {
         mavenLocal()
         maven { url 'https://jitpack.io' }
 
+        // SuperiorSkyblock2
+        maven { url 'https://repo.bg-software.com/repository/api/' }
+
         // NMS (for jitpack compilation)
         maven { url 'https://repo.codemc.org/repository/nms/' }
 
-        // bStats, mcMMO
-        maven { url 'https://repo.codemc.org/repository/maven-public' }
+        // bStats, mcMMO, BentoBox
+        maven { url 'https://repo.codemc.org/repository/maven-public/' }
 
         // Spigot API
         maven { url 'https://hub.spigotmc.org/nexus/content/repositories/snapshots/' }
@@ -51,23 +54,20 @@ allprojects {
 
         // CombatLogX
         maven { url 'https://nexus.sirblobman.xyz/repository/public/' }
-
-        // Head Database
-        maven { url 'https://mvn.intellectualsites.com/content/groups/public/' }
     }
 
     dependencies {
         compileOnly 'org.jetbrains:annotations:19.0.0'
 
         // Lombok
-        compileOnly 'org.projectlombok:lombok:1.18.20'
+        compileOnly 'org.projectlombok:lombok:1.18.22'
         annotationProcessor 'org.projectlombok:lombok:1.18.20'
         testCompileOnly 'org.projectlombok:lombok:1.18.20'
         testAnnotationProcessor 'org.projectlombok:lombok:1.18.20'
 
         // Test
         testImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.1'
-        testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.3.1'
+        testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
     }
 
     tasks.withType(JavaCompile) {
@@ -87,6 +87,7 @@ allprojects {
 
     shadowJar {
         relocate('org.bstats', 'com.willfp.eco.shaded.bstats')
+        relocate('net.kyori.adventure.text.minimessage', 'com.willfp.eco.shaded.minimessage')
     }
 
     jar {

eco-api/build.gradle

@@ -6,12 +6,18 @@ group 'com.willfp'
 version rootProject.version
 
 dependencies {
-    compileOnly 'org.spigotmc:spigot-api:1.17-R0.1-SNAPSHOT'
-    compileOnly 'org.apache.maven:maven-artifact:3.0.3'
-    compileOnly 'com.comphenix.protocol:ProtocolLib:4.6.0-SNAPSHOT'
-    compileOnly 'com.google.code.gson:gson:2.8.7'
-    compileOnly 'net.kyori:adventure-text-serializer-gson:4.8.1'
-    compileOnly 'net.kyori:adventure-text-serializer-legacy:4.8.1'
+    // Adventure
+    compileOnly 'net.kyori:adventure-platform-bukkit:4.0.0'
+    compileOnly 'net.kyori:adventure-text-minimessage:4.1.0-SNAPSHOT'
+    compileOnly 'net.kyori:adventure-api:4.9.2'
+    compileOnly 'net.kyori:adventure-text-serializer-gson:4.9.2'
+    compileOnly 'net.kyori:adventure-text-serializer-legacy:4.9.2'
+
+    // Other
+    compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
+    compileOnly 'org.apache.maven:maven-artifact:3.8.1'
+    compileOnly 'com.comphenix.protocol:ProtocolLib:4.7.1-SNAPSHOT'
+    compileOnly 'com.google.code.gson:gson:2.8.8'
 }
 
 java {

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

@@ -1,6 +1,5 @@
 package com.willfp.eco.core;
 
-import lombok.Getter;
 import lombok.experimental.UtilityClass;
 import org.apache.commons.lang.Validate;
 import org.jetbrains.annotations.ApiStatus;
@@ -15,20 +14,12 @@ import org.jetbrains.annotations.NotNull;
 public class Eco {
     /**
      * Instance of eco handler.
-     * <p>
-     * The handler is, in essence, a way to interface between the eco-api
-     * frontend module, and the eco-backend implementations.
-     * <p>
-     * There shouldn't really be any reason to ever use the handler
-     * in your own plugins, but if you want to then you can - it's
-     * just a part of the API like any other.
      */
-    @Getter
+    @ApiStatus.Internal
     private Handler handler;
 
     /**
      * Set the handler.
-     *
      * @param handler The handler.
      */
     @ApiStatus.Internal
@@ -37,4 +28,25 @@ public class Eco {
 
         Eco.handler = handler;
     }
+
+    /**
+     * Get the instance of the eco handler.
+     * <p>
+     * The handler is, in essence, a way to interface between the eco-api
+     * frontend module, and the eco-backend implementations.
+     * <p>
+     * There shouldn't really be any reason to ever use the handler
+     * in your own plugins, and you are likely to break things. All parts of
+     * the handler are abstracted into logically named parts of the API.
+     * <p>
+     * In versions of eco before 6.12.0, the handler was considered part of
+     * the eco API, however it has since been moved into an internal component
+     * that shouldn't be used in your plugins.
+     *
+     * @return The handler.
+     */
+    @ApiStatus.Internal
+    public Handler getHandler() {
+        return handler;
+    }
 }

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

@@ -52,9 +52,9 @@ import java.util.stream.Collectors;
  * be cancelled.</b>
  */
 @SuppressWarnings("unused")
-public abstract class EcoPlugin extends JavaPlugin {
+public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     /**
-     * The spigot resource ID of the plugin.
+     * The polymart resource ID of the plugin.
      */
     @Getter
     private final int resourceId;
@@ -169,14 +169,14 @@ public abstract class EcoPlugin extends JavaPlugin {
     private final ProxyFactory proxyFactory;
 
     /**
-     * Create a new plugin without a specified color, proxy support, spigot, or bStats.
+     * Create a new plugin without a specified color, proxy support, polymart, or bStats.
      */
     protected EcoPlugin() {
         this("&f");
     }
 
     /**
-     * Create a new plugin without proxy support, spigot, or bStats.
+     * Create a new plugin without proxy support, polymart, or bStats.
      *
      * @param color The color.
      */
@@ -186,7 +186,7 @@ public abstract class EcoPlugin extends JavaPlugin {
 
 
     /**
-     * Create a new plugin unlinked to spigot and bStats.
+     * Create a new plugin unlinked to polymart and bStats.
      *
      * @param proxyPackage The package where proxy implementations are stored.
      * @param color        The color of the plugin (used in messages, using standard formatting)
@@ -199,7 +199,7 @@ public abstract class EcoPlugin extends JavaPlugin {
     /**
      * Create a new plugin without proxy or extension support.
      *
-     * @param resourceId The spigot resource ID for the plugin.
+     * @param resourceId The polymart resource ID for the plugin.
      * @param bStatsId   The bStats resource ID for the plugin.
      * @param color      The color of the plugin (used in messages, using standard formatting)
      */
@@ -212,7 +212,7 @@ public abstract class EcoPlugin extends JavaPlugin {
     /**
      * Create a new plugin without proxy support.
      *
-     * @param resourceId           The spigot resource ID for the plugin.
+     * @param resourceId           The polymart resource ID for the plugin.
      * @param bStatsId             The bStats resource ID for the plugin.
      * @param color                The color of the plugin (used in messages, using standard formatting)
      * @param supportingExtensions If the plugin supports extensions.
@@ -227,7 +227,7 @@ public abstract class EcoPlugin extends JavaPlugin {
     /**
      * Create a new plugin without extension support.
      *
-     * @param resourceId   The spigot resource ID for the plugin.
+     * @param resourceId   The polymart resource ID for the plugin.
      * @param bStatsId     The bStats resource ID for the plugin.
      * @param proxyPackage The package where proxy implementations are stored.
      * @param color        The color of the plugin (used in messages, using standard formatting)
@@ -242,7 +242,7 @@ public abstract class EcoPlugin extends JavaPlugin {
     /**
      * Create a new plugin.
      *
-     * @param resourceId           The spigot resource ID for the plugin.
+     * @param resourceId           The polymart resource ID for the plugin.
      * @param bStatsId             The bStats resource ID for the plugin.
      * @param proxyPackage         The package where proxy implementations are stored.
      * @param color                The color of the plugin (used in messages, using standard formatting)
@@ -357,15 +357,18 @@ public abstract class EcoPlugin extends JavaPlugin {
             Eco.getHandler().registerBStats(this);
         }
 
-        Set<String> enabledPlugins = Arrays.stream(Bukkit.getPluginManager().getPlugins()).map(Plugin::getName).collect(Collectors.toSet());
+        Set<String> enabledPlugins = Arrays.stream(Bukkit.getPluginManager().getPlugins())
+                .map(Plugin::getName)
+                .map(String::toLowerCase)
+                .collect(Collectors.toSet());
 
-        if (enabledPlugins.contains("PlaceholderAPI")) {
+        if (enabledPlugins.contains("PlaceholderAPI".toLowerCase())) {
             this.loadedIntegrations.add("PlaceholderAPI");
             PlaceholderManager.addIntegration(Eco.getHandler().createPAPIIntegration(this));
         }
 
         this.loadIntegrationLoaders().forEach((integrationLoader -> {
-            if (enabledPlugins.contains(integrationLoader.getPluginName())) {
+            if (enabledPlugins.contains(integrationLoader.getPluginName().toLowerCase())) {
                 this.loadedIntegrations.add(integrationLoader.getPluginName());
                 integrationLoader.load();
             }

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

@@ -2,6 +2,8 @@ package com.willfp.eco.core;
 
 import com.willfp.eco.core.config.updating.ConfigHandler;
 import com.willfp.eco.core.config.wrapper.ConfigFactory;
+import com.willfp.eco.core.data.keys.KeyRegistry;
+import com.willfp.eco.core.data.PlayerProfileHandler;
 import com.willfp.eco.core.drops.DropQueueFactory;
 import com.willfp.eco.core.events.EventManager;
 import com.willfp.eco.core.extensions.ExtensionLoader;
@@ -13,8 +15,11 @@ import com.willfp.eco.core.gui.GUIFactory;
 import com.willfp.eco.core.integrations.placeholder.PlaceholderIntegration;
 import com.willfp.eco.core.proxy.Cleaner;
 import com.willfp.eco.core.proxy.ProxyFactory;
+import com.willfp.eco.core.requirement.RequirementFactory;
 import com.willfp.eco.core.scheduling.Scheduler;
+import net.kyori.adventure.platform.bukkit.BukkitAudiences;
 import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -22,8 +27,9 @@ import java.util.List;
 import java.util.logging.Logger;
 
 /**
- * @see Eco
+ * @see Eco#getHandler()
  */
+@ApiStatus.Internal
 public interface Handler {
     /**
      * Create a scheduler.
@@ -194,4 +200,35 @@ public interface Handler {
      * @param plugin The plugin.
      */
     void registerBStats(@NotNull EcoPlugin plugin);
+
+    /**
+     * Get the requirement factory.
+     *
+     * @return The factory.
+     */
+    @NotNull
+    RequirementFactory getRequirementFactory();
+
+    /**
+     * Get Adventure audiences.
+     *
+     * @return The audiences.
+     */
+    @Nullable
+    BukkitAudiences getAdventure();
+
+    /**
+     * Get the key registry.
+     *
+     * @return The registry.
+     */
+    @NotNull
+    KeyRegistry getKeyRegistry();
+
+    /**
+     * Get the PlayerProfile handler.
+     *
+     * @return The handler.
+     */
+    PlayerProfileHandler getPlayerProfileHandler();
 }

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

@@ -9,7 +9,7 @@ import org.jetbrains.annotations.NotNull;
  *
  * @param <T> The eco plugin type.
  */
-public abstract class PluginDependent<@NotNull T extends EcoPlugin> {
+public abstract class PluginDependent<T extends EcoPlugin> {
     /**
      * The {@link EcoPlugin} that is stored.
      */

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

@@ -0,0 +1,29 @@
+package com.willfp.eco.core;
+
+import com.willfp.eco.core.config.updating.ConfigHandler;
+
+import java.io.File;
+
+/**
+ * Represents any class that acts like a plugin, for example {@link EcoPlugin}
+ * or {@link com.willfp.eco.core.extensions.Extension}. This exists to create
+ * things such as extension base configs rather than needing to pass an instance
+ * of the owning plugin.
+ */
+public interface PluginLike {
+    /**
+     * Get the data folder of the object.
+     * <p>
+     * Returns the plugin data folder for a plugin, or the extension's parent plugin's folder
+     *
+     * @return The data folder.
+     */
+    File getDataFolder();
+
+    /**
+     * Get the handler class for updatable classes.
+     *
+     * @return The config handler.
+     */
+    ConfigHandler getConfigHandler();
+}

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/LoadableConfig.java

@@ -34,7 +34,7 @@ public interface LoadableConfig {
     File getConfigFile();
 
     /**
-     * Get the config name (including extension)
+     * Get the config name (including extension).
      *
      * @return The name.
      */

eco-api/src/main/java/com/willfp/eco/core/config/json/JSONBaseConfig.java

@@ -0,0 +1,78 @@
+package com.willfp.eco.core.config.json;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Config implementation for configs present in the plugin's base directory (eg config.json).
+ * <p>
+ * Automatically updates.
+ */
+public abstract class JSONBaseConfig extends LoadableJSONConfigWrapper {
+    /**
+     * @param configName      The name of the config
+     * @param removeUnused    Whether keys not present in the default config should be removed on update.
+     * @param plugin          The plugin.
+     * @param updateBlacklist Substring of keys to not add/remove keys for.
+     */
+    protected JSONBaseConfig(@NotNull final String configName,
+                             final boolean removeUnused,
+                             @NotNull final PluginLike plugin,
+                             @NotNull final String... updateBlacklist) {
+        super(
+                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
+                        configName,
+                        plugin,
+                        "",
+                        plugin.getClass(),
+                        removeUnused, updateBlacklist
+                )
+        );
+    }
+
+    /**
+     * @param configName   The name of the config
+     * @param removeUnused Whether keys not present in the default config should be removed on update.
+     * @param plugin       The plugin.
+     */
+    protected JSONBaseConfig(@NotNull final String configName,
+                             final boolean removeUnused,
+                             @NotNull final PluginLike plugin) {
+        super(
+                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
+                        configName,
+                        plugin,
+                        "",
+                        plugin.getClass(),
+                        removeUnused
+                )
+        );
+    }
+
+    /**
+     * @param configName      The name of the config
+     * @param removeUnused    Whether keys not present in the default config should be removed on update.
+     * @param plugin          The plugin.
+     * @param updateBlacklist Substring of keys to not add/remove keys for.
+     */
+    protected JSONBaseConfig(@NotNull final String configName,
+                             final boolean removeUnused,
+                             @NotNull final EcoPlugin plugin,
+                             @NotNull final String... updateBlacklist) {
+        this(configName, removeUnused, (PluginLike) plugin, updateBlacklist);
+    }
+
+    /**
+     * @param configName   The name of the config
+     * @param removeUnused Whether keys not present in the default config should be removed on update.
+     * @param plugin       The plugin.
+     */
+    protected JSONBaseConfig(@NotNull final String configName,
+                             final boolean removeUnused,
+                             @NotNull final EcoPlugin plugin) {
+        this(configName, removeUnused, (PluginLike) plugin);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/json/JSONExtendableConfig.java

@@ -0,0 +1,60 @@
+package com.willfp.eco.core.config.json;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Config implementation for configs present in one of two places:
+ * <ul>
+ *     <li>Plugin base directory (eg config.yml, lang.yml)</li>
+ *     <li>Other extension's configs</li>
+ * </ul>
+ * <p>
+ * Automatically updates.
+ */
+public abstract class JSONExtendableConfig extends LoadableJSONConfigWrapper {
+    /**
+     * @param configName       The name of the config
+     * @param removeUnused     Whether keys not present in the default config should be removed on update.
+     * @param plugin           The plugin.
+     * @param updateBlacklist  Substring of keys to not add/remove keys for.
+     * @param subDirectoryPath The subdirectory path.
+     * @param source           The class that owns the resource.
+     */
+    protected JSONExtendableConfig(@NotNull final String configName,
+                                   final boolean removeUnused,
+                                   @NotNull final PluginLike plugin,
+                                   @NotNull final Class<?> source,
+                                   @NotNull final String subDirectoryPath,
+                                   @NotNull final String... updateBlacklist) {
+        super(
+                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
+                        configName,
+                        plugin,
+                        subDirectoryPath,
+                        source,
+                        removeUnused,
+                        updateBlacklist
+                )
+        );
+    }
+    /**
+     * @param configName       The name of the config
+     * @param removeUnused     Whether keys not present in the default config should be removed on update.
+     * @param plugin           The plugin.
+     * @param updateBlacklist  Substring of keys to not add/remove keys for.
+     * @param subDirectoryPath The subdirectory path.
+     * @param source           The class that owns the resource.
+     */
+    protected JSONExtendableConfig(@NotNull final String configName,
+                                   final boolean removeUnused,
+                                   @NotNull final EcoPlugin plugin,
+                                   @NotNull final Class<?> source,
+                                   @NotNull final String subDirectoryPath,
+                                   @NotNull final String... updateBlacklist) {
+        this(configName, removeUnused, (PluginLike) plugin, source, subDirectoryPath, updateBlacklist);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/json/JSONStaticBaseConfig.java

@@ -2,6 +2,7 @@ package com.willfp.eco.core.config.json;
 
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginLike;
 import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
@@ -18,7 +19,20 @@ public abstract class JSONStaticBaseConfig extends LoadableJSONConfigWrapper {
      * @param plugin     The plugin.
      */
     protected JSONStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final EcoPlugin plugin) {
+                                   @NotNull final PluginLike plugin) {
         super(Eco.getHandler().getConfigFactory().createLoadableJSONConfig(configName, plugin, "", plugin.getClass()));
     }
+
+    /**
+     * Config implementation for configs present in the plugin's base directory (eg config.json, lang.json).
+     * <p>
+     * Does not automatically update.
+     *
+     * @param configName The name of the config
+     * @param plugin     The plugin.
+     */
+    protected JSONStaticBaseConfig(@NotNull final String configName,
+                                   @NotNull final EcoPlugin plugin) {
+        this(configName, (PluginLike) plugin);
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/config/updating/ConfigHandler.java

@@ -4,7 +4,7 @@ import com.willfp.eco.core.config.interfaces.LoadableConfig;
 import org.jetbrains.annotations.NotNull;
 
 /**
- * Every {@link com.willfp.eco.core.EcoPlugin} has a config handler.
+ * Every {@link com.willfp.eco.core.PluginLike} has a config handler.
  * <p>
  * Handles updating and saving configs.
  */

eco-api/src/main/java/com/willfp/eco/core/config/wrapper/ConfigFactory.java

@@ -1,6 +1,6 @@
 package com.willfp.eco.core.config.wrapper;
 
-import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginLike;
 import com.willfp.eco.core.config.interfaces.Config;
 import com.willfp.eco.core.config.interfaces.JSONConfig;
 import org.bukkit.configuration.file.YamlConfiguration;
@@ -24,7 +24,25 @@ public interface ConfigFactory {
      * @return The config implementation.
      */
     Config createUpdatableYamlConfig(@NotNull String configName,
-                                     @NotNull EcoPlugin plugin,
+                                     @NotNull PluginLike plugin,
+                                     @NotNull String subDirectoryPath,
+                                     @NotNull Class<?> source,
+                                     boolean removeUnused,
+                                     @NotNull String... updateBlacklist);
+
+    /**
+     * Updatable config.
+     *
+     * @param configName       The name of the config
+     * @param plugin           The plugin.
+     * @param subDirectoryPath The subdirectory path.
+     * @param source           The class that owns the resource.
+     * @param removeUnused     Whether keys not present in the default config should be removed on update.
+     * @param updateBlacklist  Substring of keys to not add/remove keys for.
+     * @return The config implementation.
+     */
+    JSONConfig createUpdatableJSONConfig(@NotNull String configName,
+                                         @NotNull PluginLike plugin,
                                          @NotNull String subDirectoryPath,
                                          @NotNull Class<?> source,
                                          boolean removeUnused,
@@ -40,7 +58,7 @@ public interface ConfigFactory {
      * @return The config implementation.
      */
     JSONConfig createLoadableJSONConfig(@NotNull String configName,
-                                        @NotNull EcoPlugin plugin,
+                                        @NotNull PluginLike plugin,
                                         @NotNull String subDirectoryPath,
                                         @NotNull Class<?> source);
 
@@ -54,7 +72,7 @@ public interface ConfigFactory {
      * @return The config implementation.
      */
     Config createLoadableYamlConfig(@NotNull String configName,
-                                    @NotNull EcoPlugin plugin,
+                                    @NotNull PluginLike plugin,
                                     @NotNull String subDirectoryPath,
                                     @NotNull Class<?> source);
 

eco-api/src/main/java/com/willfp/eco/core/config/yaml/YamlBaseConfig.java

@@ -2,6 +2,7 @@ package com.willfp.eco.core.config.yaml;
 
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginLike;
 import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
@@ -19,7 +20,7 @@ public abstract class YamlBaseConfig extends LoadableYamlConfigWrapper {
      */
     protected YamlBaseConfig(@NotNull final String configName,
                              final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin,
+                             @NotNull final PluginLike plugin,
                              @NotNull final String... updateBlacklist) {
         super(
                 Eco.getHandler().getConfigFactory().createUpdatableYamlConfig(
@@ -39,7 +40,7 @@ public abstract class YamlBaseConfig extends LoadableYamlConfigWrapper {
      */
     protected YamlBaseConfig(@NotNull final String configName,
                              final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin) {
+                             @NotNull final PluginLike plugin) {
         super(
                 Eco.getHandler().getConfigFactory().createUpdatableYamlConfig(
                         configName,
@@ -50,4 +51,28 @@ public abstract class YamlBaseConfig extends LoadableYamlConfigWrapper {
                 )
         );
     }
+
+    /**
+     * @param configName      The name of the config
+     * @param removeUnused    Whether keys not present in the default config should be removed on update.
+     * @param plugin          The plugin.
+     * @param updateBlacklist Substring of keys to not add/remove keys for.
+     */
+    protected YamlBaseConfig(@NotNull final String configName,
+                             final boolean removeUnused,
+                             @NotNull final EcoPlugin plugin,
+                             @NotNull final String... updateBlacklist) {
+        this(configName, removeUnused, (PluginLike) plugin, updateBlacklist);
+    }
+
+    /**
+     * @param configName   The name of the config
+     * @param removeUnused Whether keys not present in the default config should be removed on update.
+     * @param plugin       The plugin.
+     */
+    protected YamlBaseConfig(@NotNull final String configName,
+                             final boolean removeUnused,
+                             @NotNull final EcoPlugin plugin) {
+        this(configName, removeUnused, (PluginLike) plugin);
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/config/yaml/YamlExtendableConfig.java

@@ -2,6 +2,7 @@ package com.willfp.eco.core.config.yaml;
 
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginLike;
 import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
@@ -25,7 +26,7 @@ public abstract class YamlExtendableConfig extends LoadableYamlConfigWrapper {
      */
     protected YamlExtendableConfig(@NotNull final String configName,
                                    final boolean removeUnused,
-                                   @NotNull final EcoPlugin plugin,
+                                   @NotNull final PluginLike plugin,
                                    @NotNull final Class<?> source,
                                    @NotNull final String subDirectoryPath,
                                    @NotNull final String... updateBlacklist) {
@@ -40,4 +41,20 @@ public abstract class YamlExtendableConfig extends LoadableYamlConfigWrapper {
                 )
         );
     }
+    /**
+     * @param configName       The name of the config
+     * @param removeUnused     Whether keys not present in the default config should be removed on update.
+     * @param plugin           The plugin.
+     * @param updateBlacklist  Substring of keys to not add/remove keys for.
+     * @param subDirectoryPath The subdirectory path.
+     * @param source           The class that owns the resource.
+     */
+    protected YamlExtendableConfig(@NotNull final String configName,
+                                   final boolean removeUnused,
+                                   @NotNull final EcoPlugin plugin,
+                                   @NotNull final Class<?> source,
+                                   @NotNull final String subDirectoryPath,
+                                   @NotNull final String... updateBlacklist) {
+        this(configName, removeUnused, (PluginLike) plugin, source, subDirectoryPath, updateBlacklist);
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/config/yaml/YamlStaticBaseConfig.java

@@ -2,6 +2,7 @@ package com.willfp.eco.core.config.yaml;
 
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginLike;
 import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
@@ -18,7 +19,20 @@ public abstract class YamlStaticBaseConfig extends LoadableYamlConfigWrapper {
      * @param plugin     The plugin.
      */
     protected YamlStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final EcoPlugin plugin) {
+                                   @NotNull final PluginLike plugin) {
         super(Eco.getHandler().getConfigFactory().createLoadableYamlConfig(configName, plugin, "", plugin.getClass()));
     }
+
+    /**
+     * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
+     * <p>
+     * Does not automatically update.
+     *
+     * @param configName The name of the config
+     * @param plugin     The plugin.
+     */
+    protected YamlStaticBaseConfig(@NotNull final String configName,
+                                   @NotNull final EcoPlugin plugin) {
+        this(configName, (PluginLike) plugin);
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/data/PlayerProfile.java

@@ -0,0 +1,56 @@
+package com.willfp.eco.core.data;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.data.keys.PersistentDataKey;
+import org.bukkit.OfflinePlayer;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.UUID;
+
+/**
+ * Persistent data storage interface for players.
+ * <p>
+ * Profiles save automatically, so there is no need to save after changes.
+ */
+public interface PlayerProfile {
+    /**
+     * Write a key to a player's persistent data.
+     *
+     * @param key   The key.
+     * @param value The value.
+     * @param <T>   The type of the key.
+     */
+    <T> void write(@NotNull PersistentDataKey<T> key,
+                   @NotNull T value);
+
+    /**
+     * Read a key from a player's persistent data.
+     *
+     * @param key The key.
+     * @param <T> The type of the key.
+     * @return The value, or the default value if not found.
+     */
+    <T> @NotNull T read(@NotNull PersistentDataKey<T> key);
+
+    /**
+     * Load a player profile.
+     *
+     * @param player The player.
+     * @return The profile.
+     */
+    @NotNull
+    static PlayerProfile load(@NotNull final OfflinePlayer player) {
+        return load(player.getUniqueId());
+    }
+
+    /**
+     * Load a player profile.
+     *
+     * @param uuid The player's UUID.
+     * @return The profile.
+     */
+    @NotNull
+    static PlayerProfile load(@NotNull final UUID uuid) {
+        return Eco.getHandler().getPlayerProfileHandler().load(uuid);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/PlayerProfileHandler.java

@@ -0,0 +1,32 @@
+package com.willfp.eco.core.data;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.UUID;
+
+/**
+ * API to handle player profiles.
+ */
+public interface PlayerProfileHandler {
+    /**
+     * Load a player profile.
+     *
+     * @param uuid The UUID.
+     * @return The profile.
+     */
+    PlayerProfile load(@NotNull UUID uuid);
+
+    /**
+     * Save a player profile.
+     *
+     * @param uuid The uuid.
+     */
+    void savePlayer(@NotNull UUID uuid);
+
+    /**
+     * Save all player data.
+     *
+     * @param async If the saving should be done asynchronously.
+     */
+    void saveAll(boolean async);
+}

eco-api/src/main/java/com/willfp/eco/core/data/keys/KeyRegistry.java

@@ -0,0 +1,24 @@
+package com.willfp.eco.core.data.keys;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Set;
+
+/**
+ * API to register persistent data keys.
+ */
+public interface KeyRegistry {
+    /**
+     * Register a persistent data key to be stored.
+     *
+     * @param key The key.
+     */
+    void registerKey(@NotNull PersistentDataKey<?> key);
+
+    /**
+     * Get all registered keys.
+     *
+     * @return The keys.
+     */
+    Set<PersistentDataKey<?>> getRegisteredKeys();
+}

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKey.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.data.keys;
+
+import com.willfp.eco.core.Eco;
+import lombok.Getter;
+import org.bukkit.NamespacedKey;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * A persistent data key is a key with a type that can be stored about an offline player.
+ *
+ * @param <T> The type of the data.
+ */
+public class PersistentDataKey<T> {
+    /**
+     * The key of the persistent data value.
+     */
+    @Getter
+    private final NamespacedKey key;
+
+    /**
+     * The default value for the key.
+     */
+    @Getter
+    private final T defaultValue;
+
+    /**
+     * The persistent data key type.
+     */
+    @Getter
+    private final PersistentDataKeyType type;
+
+    /**
+     * Create a new Persistent Data Key.
+     *
+     * @param key          The key.
+     * @param type         The data type.
+     * @param defaultValue The default value.
+     */
+    public PersistentDataKey(@NotNull final NamespacedKey key,
+                             @NotNull final PersistentDataKeyType type,
+                             @NotNull final T defaultValue) {
+        this.key = key;
+        this.defaultValue = defaultValue;
+        this.type = type;
+
+        Eco.getHandler().getKeyRegistry().registerKey(this);
+    }
+
+    @Override
+    public String toString() {
+        return "PersistentDataKey{"
+                + "key=" + key
+                + ", defaultValue=" + defaultValue
+                + ", type=" + type
+                + '}';
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKeyType.java

@@ -0,0 +1,26 @@
+package com.willfp.eco.core.data.keys;
+
+/**
+ * All storable data key types.
+ */
+public enum PersistentDataKeyType {
+    /**
+     * String.
+     */
+    STRING,
+
+    /**
+     * Boolean.
+     */
+    BOOLEAN,
+
+    /**
+     * Integer.
+     */
+    INT,
+
+    /**
+     * Double.
+     */
+    DOUBLE
+}

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

@@ -1,22 +1,12 @@
 package com.willfp.eco.core.display;
 
 import lombok.experimental.UtilityClass;
-import org.apache.commons.lang.Validate;
-import org.bukkit.NamespacedKey;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
-import org.bukkit.inventory.meta.ItemMeta;
-import org.bukkit.persistence.PersistentDataContainer;
-import org.bukkit.persistence.PersistentDataType;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
 /**
  * Utility class to manage client-side item display.
  */
@@ -28,29 +18,9 @@ public class Display {
     public static final String PREFIX = "§z";
 
     /**
-     * All registered display modules.
+     * The display handler.
      */
-    private static final Map<DisplayPriority, List<DisplayModule>> MODULES = new HashMap<>();
-
-    /**
-     * NamespacedKey for finalizing.
-     */
-    private static NamespacedKey finalizeKey = null;
-
-    /**
-     * Register display module.
-     *
-     * @param module The module.
-     */
-    public void registerDisplayModule(@NotNull final DisplayModule module) {
-        List<DisplayModule> modules = MODULES.get(module.getPriority());
-
-        modules.removeIf(module1 -> module1.getPluginName().equalsIgnoreCase(module.getPluginName()));
-
-        modules.add(module);
-
-        MODULES.put(module.getPriority(), modules);
-    }
+    private static DisplayHandler handler = null;
 
     /**
      * Display on ItemStacks.
@@ -71,35 +41,7 @@ public class Display {
      */
     public ItemStack display(@NotNull final ItemStack itemStack,
                              @Nullable final Player player) {
-        Map<String, Object[]> pluginVarArgs = new HashMap<>();
-
-        for (DisplayPriority priority : DisplayPriority.values()) {
-            List<DisplayModule> modules = MODULES.get(priority);
-            for (DisplayModule module : modules) {
-                pluginVarArgs.put(module.getPluginName(), module.generateVarArgs(itemStack));
-            }
-        }
-
-        revert(itemStack);
-
-        ItemMeta meta = itemStack.getItemMeta();
-
-        if (meta == null) {
-            return itemStack;
-        }
-
-        for (DisplayPriority priority : DisplayPriority.values()) {
-            List<DisplayModule> modules = MODULES.get(priority);
-            for (DisplayModule module : modules) {
-                Object[] varargs = pluginVarArgs.get(module.getPluginName());
-                module.display(itemStack, varargs);
-                if (player != null) {
-                    module.display(itemStack, player, varargs);
-                }
-            }
-        }
-
-        return itemStack;
+        return handler.display(itemStack, player);
     }
 
     /**
@@ -131,31 +73,7 @@ public class Display {
      * @return The ItemStack.
      */
     public ItemStack revert(@NotNull final ItemStack itemStack) {
-        if (Display.isFinalized(itemStack)) {
-            unfinalize(itemStack);
-        }
-
-        ItemMeta meta = itemStack.getItemMeta();
-
-        if (meta == null) {
-            return itemStack;
-        }
-
-        List<String> lore = meta.getLore();
-
-        if (lore != null && lore.removeIf(line -> line.startsWith(Display.PREFIX))) { // only apply lore modification if needed
-            meta.setLore(lore);
-            itemStack.setItemMeta(meta);
-        }
-
-        for (DisplayPriority priority : DisplayPriority.values()) {
-            List<DisplayModule> modules = MODULES.get(priority);
-            for (DisplayModule module : modules) {
-                module.revert(itemStack);
-            }
-        }
-
-        return itemStack;
+        return handler.revert(itemStack);
     }
 
     /**
@@ -165,21 +83,7 @@ public class Display {
      * @return The ItemStack.
      */
     public ItemStack finalize(@NotNull final ItemStack itemStack) {
-        Validate.notNull(finalizeKey, "Key cannot be null!");
-
-        if (itemStack.getType().getMaxStackSize() > 1) {
-            return itemStack;
-        }
-
-        ItemMeta meta = itemStack.getItemMeta();
-        if (meta == null) {
-            return itemStack;
-        }
-
-        PersistentDataContainer container = meta.getPersistentDataContainer();
-        container.set(finalizeKey, PersistentDataType.INTEGER, 1);
-        itemStack.setItemMeta(meta);
-        return itemStack;
+        return handler.finalize(itemStack);
     }
 
     /**
@@ -189,18 +93,7 @@ public class Display {
      * @return The ItemStack.
      */
     public ItemStack unfinalize(@NotNull final ItemStack itemStack) {
-        Validate.notNull(finalizeKey, "Key cannot be null!");
-
-        ItemMeta meta = itemStack.getItemMeta();
-
-        if (meta == null) {
-            return itemStack;
-        }
-
-        PersistentDataContainer container = meta.getPersistentDataContainer();
-        container.remove(finalizeKey);
-        itemStack.setItemMeta(meta);
-        return itemStack;
+        return handler.unfinalize(itemStack);
     }
 
     /**
@@ -210,31 +103,77 @@ public class Display {
      * @return If finalized.
      */
     public boolean isFinalized(@NotNull final ItemStack itemStack) {
-        Validate.notNull(finalizeKey, "Key cannot be null!");
-
-        ItemMeta meta = itemStack.getItemMeta();
-
-        if (meta == null) {
-            return false;
-        }
-
-        PersistentDataContainer container = meta.getPersistentDataContainer();
-        return container.has(finalizeKey, PersistentDataType.INTEGER);
+        return handler.isFinalized(itemStack);
     }
 
     /**
-     * Set key to be used for finalization.
+     * Register a new display module.
      *
-     * @param finalizeKey The key.
+     * @param module The module.
      */
-    @ApiStatus.Internal
-    public static void setFinalizeKey(@NotNull final NamespacedKey finalizeKey) {
-        Display.finalizeKey = finalizeKey;
+    public void registerDisplayModule(@NotNull final DisplayModule module) {
+        handler.registerDisplayModule(module);
     }
 
-    static {
-        for (DisplayPriority priority : DisplayPriority.values()) {
-            MODULES.put(priority, new ArrayList<>());
+    /**
+     * Initialize the display system.
+     *
+     * @param handler The handler.
+     */
+    @ApiStatus.Internal
+    public static void init(@NotNull final DisplayHandler handler) {
+        if (Display.handler != null) {
+            throw new IllegalArgumentException("Already Initialized!");
+        }
+        Display.handler = handler;
+    }
+
+    /**
+     * Extremely janky method - also internal, so don't use it. <b>This method is
+     * NOT part of the API and may be removed at any time!</b>
+     * <p>
+     * This calls a display module with the specified parameters, now
+     * you might ask why I need a static java method when the DisplayHandler
+     * implementation could just call it itself? Well, kotlin doesn't really
+     * like dealing with vararg ambiguity, and so while kotlin can't figure out
+     * what is and isn't a vararg when I call display with a player, java can.
+     * <p>
+     * Because of this, I need to have this part of the code in java.
+     *
+     * <b>Don't call this method as part of your plugins!</b>
+     * <p>
+     * No, seriously - don't. This skips a bunch of checks and you'll almost
+     * definitely break something.
+     *
+     * @param module    The display module.
+     * @param itemStack The ItemStack.
+     * @param player    The player.
+     * @param args      The args.
+     */
+    @ApiStatus.Internal
+    public static void callDisplayModule(@NotNull final DisplayModule module,
+                                         @NotNull final ItemStack itemStack,
+                                         @Nullable final Player player,
+                                         @NotNull final Object... args) {
+        module.display(itemStack, args);
+        if (player != null) {
+            module.display(itemStack, player, args);
         }
     }
+
+    /**
+     * Set the display handler.
+     * <p>
+     * Internal API component, you will cause bugs if you create your own handler.
+     *
+     * @param handler The handler.
+     */
+    @ApiStatus.Internal
+    public static void setHandler(@NotNull final DisplayHandler handler) {
+        if (Display.handler != null) {
+            throw new IllegalStateException("Display already initialized!");
+        }
+
+        Display.handler = handler;
+    }
 }

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

@@ -0,0 +1,60 @@
+package com.willfp.eco.core.display;
+
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Interface for display implementations.
+ */
+public interface DisplayHandler {
+    /**
+     * Register display module.
+     *
+     * @param module The module.
+     */
+    void registerDisplayModule(@NotNull DisplayModule module);
+
+    /**
+     * Display on ItemStacks.
+     *
+     * @param itemStack The item.
+     * @param player    The player.
+     * @return The ItemStack.
+     */
+    ItemStack display(@NotNull ItemStack itemStack,
+                      @Nullable Player player);
+
+    /**
+     * Revert on ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    ItemStack revert(@NotNull ItemStack itemStack);
+
+    /**
+     * Finalize an ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    ItemStack finalize(@NotNull ItemStack itemStack);
+
+    /**
+     * Unfinalize an ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    ItemStack unfinalize(@NotNull ItemStack itemStack);
+
+    /**
+     * If an item is finalized.
+     *
+     * @param itemStack The item.
+     * @return If finalized.
+     */
+    boolean isFinalized(@NotNull ItemStack itemStack);
+}

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

@@ -36,7 +36,7 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
      * @param itemStack The item.
      * @param args      Optional args for display.
      */
-    protected void display(@NotNull final ItemStack itemStack,
+    public void display(@NotNull final ItemStack itemStack,
                         @NotNull final Object... args) {
         // Technically optional.
     }
@@ -48,7 +48,7 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
      * @param player    The player.
      * @param args      Optional args for display.
      */
-    protected void display(@NotNull final ItemStack itemStack,
+    public void display(@NotNull final ItemStack itemStack,
                         @Nullable final Player player,
                         @NotNull final Object... args) {
         // Technically optional.
@@ -59,7 +59,7 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
      *
      * @param itemStack The item.
      */
-    protected void revert(@NotNull final ItemStack itemStack) {
+    public void revert(@NotNull final ItemStack itemStack) {
         // Technically optional.
     }
 
@@ -69,7 +69,7 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
      * @param itemStack The itemStack.
      * @return The plugin-specific varargs.
      */
-    protected Object[] generateVarArgs(@NotNull final ItemStack itemStack) {
+    public Object[] generateVarArgs(@NotNull final ItemStack itemStack) {
         return new Object[0];
     }
 

eco-api/src/main/java/com/willfp/eco/core/extensions/Extension.java

@@ -1,11 +1,15 @@
 package com.willfp.eco.core.extensions;
 
 import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.updating.ConfigHandler;
 import lombok.AccessLevel;
 import lombok.Getter;
 import org.apache.commons.lang.Validate;
 import org.jetbrains.annotations.NotNull;
 
+import java.io.File;
+
 /**
  * An extension is a separate jar file that hooks into the base plugin jar.
  * <p>
@@ -15,9 +19,9 @@ import org.jetbrains.annotations.NotNull;
  * Syntactically, extensions are very similar to plugins in their own right, except that
  * they are loaded by another plugin.
  *
- * @see <a href="https://ecoenchants.polymart.org">EcoEnchants extension examples.</a>
+ * @see <a href="https://auxilor.polymart.org">Extension examples.</a>
  */
-public abstract class Extension {
+public abstract class Extension implements PluginLike {
     /**
      * The {@link EcoPlugin} that this extension is for.
      */
@@ -103,4 +107,14 @@ public abstract class Extension {
         Validate.notNull(metadata, "Metadata cannot be null!");
         return this.metadata.version();
     }
+
+    @Override
+    public File getDataFolder() {
+        return this.plugin.getDataFolder();
+    }
+
+    @Override
+    public ConfigHandler getConfigHandler() {
+        return this.plugin.getConfigHandler();
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/fast/FastItemStack.java

@@ -107,7 +107,7 @@ public interface FastItemStack {
      * @param itemStack The ItemStack.
      * @return The FastItemStack.
      */
-    static FastItemStack wrap(final ItemStack itemStack) {
+    static FastItemStack wrap(@Nullable final ItemStack itemStack) {
         return Eco.getHandler().createFastItemStack(Objects.requireNonNullElseGet(itemStack, () -> new ItemStack(Material.AIR)));
     }
 }

eco-api/src/main/java/com/willfp/eco/core/integrations/afk/AFKManager.java

@@ -0,0 +1,44 @@
+package com.willfp.eco.core.integrations.afk;
+
+import lombok.experimental.UtilityClass;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Class to handle afk integrations.
+ */
+@UtilityClass
+public class AFKManager {
+    /**
+     * A set of all registered integrations.
+     */
+    private final Set<AFKWrapper> registered = new HashSet<>();
+
+    /**
+     * Register a new integration.
+     *
+     * @param integration The integration to register.
+     */
+    public void register(@NotNull final AFKWrapper integration) {
+        registered.add(integration);
+    }
+
+    /**
+     * Get if a player is afk.
+     *
+     * @param player The player.
+     * @return If afk.
+     */
+    public boolean isAfk(@NotNull final Player player) {
+        for (AFKWrapper afkWrapper : registered) {
+            if (afkWrapper.isAfk(player)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/afk/AFKWrapper.java

@@ -0,0 +1,18 @@
+package com.willfp.eco.core.integrations.afk;
+
+import com.willfp.eco.core.integrations.Integration;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Wrapper class for afk integrations.
+ */
+public interface AFKWrapper extends Integration {
+    /**
+     * Get if a player is afk.
+     *
+     * @param player The player.
+     * @return If afk.
+     */
+    boolean isAfk(@NotNull Player player);
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/antigrief/AntigriefManager.java

@@ -29,6 +29,16 @@ public class AntigriefManager {
         registered.add(antigrief);
     }
 
+    /**
+     * Unregister an AntiGrief/Land Management integration.
+     *
+     * @param antigrief The integration to unregister.
+     */
+    public void unregister(@NotNull final AntigriefWrapper antigrief) {
+        registered.removeIf(it -> it.getPluginName().equalsIgnoreCase(antigrief.getPluginName()));
+        registered.remove(antigrief);
+    }
+
     /**
      * Can player break block.
      *

eco-api/src/main/java/com/willfp/eco/core/integrations/economy/EconomyManager.java

@@ -0,0 +1,99 @@
+package com.willfp.eco.core.integrations.economy;
+
+import lombok.experimental.UtilityClass;
+import org.bukkit.OfflinePlayer;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Class to handle economy.
+ */
+@UtilityClass
+public class EconomyManager {
+    /**
+     * A set of all registered integrations.
+     */
+    private final Set<EconomyWrapper> registered = new HashSet<>();
+
+    /**
+     * Register a new integration.
+     *
+     * @param integration The integration to register.
+     */
+    public void register(@NotNull final EconomyWrapper integration) {
+        registered.add(integration);
+    }
+
+    /**
+     * Get if any economy registrations are registered.
+     *
+     * @return If any economy.
+     */
+    public boolean hasRegistrations() {
+        return !registered.isEmpty();
+    }
+
+    /**
+     * Get if a player has a certain amount.
+     *
+     * @param player The player.
+     * @param amount The amount.
+     * @return If the player has the amount.
+     */
+    public boolean hasAmount(@NotNull final OfflinePlayer player,
+                             final double amount) {
+        for (EconomyWrapper wrapper : registered) {
+            return wrapper.hasAmount(player, amount);
+        }
+
+        return false;
+    }
+
+    /**
+     * Give money to a player.
+     *
+     * @param player The player.
+     * @param amount The amount to give.
+     * @return If the transaction was a success.
+     */
+    public boolean giveMoney(@NotNull final OfflinePlayer player,
+                             final double amount) {
+        for (EconomyWrapper wrapper : registered) {
+            return wrapper.giveMoney(player, amount);
+        }
+
+        return false;
+    }
+
+    /**
+     * Remove money from a player.
+     *
+     * @param player The player.
+     * @param amount The amount to remove.
+     * @return If the transaction was a success.
+     */
+    public boolean removeMoney(@NotNull final OfflinePlayer player,
+                               final double amount) {
+        for (EconomyWrapper wrapper : registered) {
+            return wrapper.removeMoney(player, amount);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the balance of a player.
+     *
+     * @param player The player.
+     * @return The balance.
+     */
+    public double getBalance(@NotNull final OfflinePlayer player) {
+        for (EconomyWrapper wrapper : registered) {
+            return wrapper.getBalance(player);
+        }
+
+        return 0;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/economy/EconomyWrapper.java

@@ -0,0 +1,48 @@
+package com.willfp.eco.core.integrations.economy;
+
+import com.willfp.eco.core.integrations.Integration;
+import org.bukkit.OfflinePlayer;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Wrapper class for economy integrations.
+ */
+public interface EconomyWrapper extends Integration {
+    /**
+     * Get if a player has a certain amount.
+     *
+     * @param player The player.
+     * @param amount The amount.
+     * @return If the player has the amount.
+     */
+    boolean hasAmount(@NotNull OfflinePlayer player,
+                      double amount);
+
+    /**
+     * Give money to a player.
+     *
+     * @param player The player.
+     * @param amount The amount to give.
+     * @return If the transaction was a success.
+     */
+    boolean giveMoney(@NotNull OfflinePlayer player,
+                      double amount);
+
+    /**
+     * Remove money from a player.
+     *
+     * @param player The player.
+     * @param amount The amount to remove.
+     * @return If the transaction was a success.
+     */
+    boolean removeMoney(@NotNull OfflinePlayer player,
+                        double amount);
+
+    /**
+     * Get the balance of a player.
+     *
+     * @param player The player.
+     * @return The balance.
+     */
+    double getBalance(@NotNull OfflinePlayer player);
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/hologram/DummyHologram.java

@@ -0,0 +1,20 @@
+package com.willfp.eco.core.integrations.hologram;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * Dummy hologram, created if no integrations are present on the server.
+ */
+class DummyHologram implements Hologram {
+    @Override
+    public void remove() {
+        // Do nothing.
+    }
+
+    @Override
+    public void setContents(@NotNull final List<String> contents) {
+        // Do nothing.
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/hologram/Hologram.java

@@ -0,0 +1,22 @@
+package com.willfp.eco.core.integrations.hologram;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * Wrapper class for plugin-specific holograms.
+ */
+public interface Hologram {
+    /**
+     * Remove the hologram.
+     */
+    void remove();
+
+    /**
+     * Set the hologram contents.
+     *
+     * @param contents The contents.
+     */
+    void setContents(@NotNull List<String> contents);
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/hologram/HologramManager.java

@@ -0,0 +1,45 @@
+package com.willfp.eco.core.integrations.hologram;
+
+import lombok.experimental.UtilityClass;
+import org.bukkit.Location;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Class to handle hologram integrations.
+ */
+@UtilityClass
+public class HologramManager {
+    /**
+     * A set of all registered integrations.
+     */
+    private final Set<HologramWrapper> registered = new HashSet<>();
+
+    /**
+     * Register a new integration.
+     *
+     * @param integration The integration to register.
+     */
+    public void register(@NotNull final HologramWrapper integration) {
+        registered.add(integration);
+    }
+
+    /**
+     * Create hologram.
+     *
+     * @param location The location.
+     * @param contents The contents for the hologram.
+     * @return The hologram.
+     */
+    public Hologram createHologram(@NotNull final Location location,
+                                   @NotNull final List<String> contents) {
+        for (HologramWrapper wrapper : registered) {
+            return wrapper.createHologram(location, contents);
+        }
+
+        return new DummyHologram();
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/hologram/HologramWrapper.java

@@ -0,0 +1,22 @@
+package com.willfp.eco.core.integrations.hologram;
+
+import com.willfp.eco.core.integrations.Integration;
+import org.bukkit.Location;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * Wrapper class for hologram integrations.
+ */
+public interface HologramWrapper extends Integration {
+    /**
+     * Create hologram.
+     *
+     * @param location The location.
+     * @param contents The contents for the hologram.
+     * @return The hologram.
+     */
+    Hologram createHologram(@NotNull Location location,
+                            @NotNull List<String> contents);
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/mcmmo/McmmoWrapper.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.integrations.mcmmo;
 
+import com.willfp.eco.core.integrations.Integration;
 import org.bukkit.block.Block;
 import org.bukkit.event.Event;
 import org.jetbrains.annotations.NotNull;
@@ -7,7 +8,7 @@ import org.jetbrains.annotations.NotNull;
 /**
  * Wrapper class for mcmmo integrations.
  */
-public interface McmmoWrapper {
+public interface McmmoWrapper extends Integration {
     /**
      * Get bonus drop count of block.
      *

eco-api/src/main/java/com/willfp/eco/core/integrations/placeholder/PlaceholderManager.java

@@ -8,9 +8,7 @@ import org.jetbrains.annotations.Nullable;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
-import java.util.Optional;
 import java.util.Set;
-import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * Class to handle placeholder integrations.

eco-api/src/main/java/com/willfp/eco/core/integrations/shop/ShopWrapper.java

@@ -1,9 +1,11 @@
 package com.willfp.eco.core.integrations.shop;
 
+import com.willfp.eco.core.integrations.Integration;
+
 /**
  * Wrapper class for shop integrations.
  */
-public interface ShopWrapper {
+public interface ShopWrapper extends Integration {
     /**
      * Register eco item provider for shop plugins.
      */

eco-api/src/main/java/com/willfp/eco/core/items/CustomItem.java

@@ -1,6 +1,8 @@
 package com.willfp.eco.core.items;
 
+import com.willfp.eco.core.Eco;
 import lombok.Getter;
+import org.bukkit.Bukkit;
 import org.bukkit.NamespacedKey;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
@@ -9,7 +11,7 @@ import org.jetbrains.annotations.Nullable;
 import java.util.function.Predicate;
 
 /**
- * A custom item has 3 components:
+ * A custom item has 3 components.
  *
  * <ul>
  *     <li>The key to identify it</li>
@@ -47,6 +49,12 @@ public class CustomItem implements TestableItem {
         this.key = key;
         this.test = test;
         this.item = item;
+
+        Eco.getHandler().getEcoPlugin().getScheduler().runLater(() -> {
+            if (!matches(getItem())) {
+                Bukkit.getLogger().severe("Item with key " + key + " is invalid!");
+            }
+        }, 1);
     }
 
     @Override

eco-api/src/main/java/com/willfp/eco/core/items/Items.java

@@ -1,11 +1,13 @@
 package com.willfp.eco.core.items;
 
 import com.willfp.eco.core.items.args.LookupArgParser;
+import com.willfp.eco.core.items.provider.ItemProvider;
 import com.willfp.eco.core.recipe.parts.EmptyTestableItem;
 import com.willfp.eco.core.recipe.parts.MaterialTestableItem;
 import com.willfp.eco.core.recipe.parts.ModifiedTestableItem;
 import com.willfp.eco.core.recipe.parts.TestableStack;
 import com.willfp.eco.util.NamespacedKeyUtils;
+import com.willfp.eco.util.NumberUtils;
 import lombok.experimental.UtilityClass;
 import org.bukkit.Material;
 import org.bukkit.NamespacedKey;
@@ -16,12 +18,12 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.Predicate;
+import java.util.stream.Collectors;
 
 /**
  * Class to manage all custom and vanilla items.
@@ -31,7 +33,12 @@ public final class Items {
     /**
      * All recipe parts.
      */
-    private static final Map<NamespacedKey, CustomItem> REGISTRY = new ConcurrentHashMap<>();
+    private static final Map<NamespacedKey, TestableItem> REGISTRY = new ConcurrentHashMap<>();
+
+    /**
+     * All item providers.
+     */
+    private static final Map<String, ItemProvider> PROVIDERS = new ConcurrentHashMap<>();
 
     /**
      * All recipe parts.
@@ -42,11 +49,20 @@ public final class Items {
      * Register a new custom item.
      *
      * @param key  The key of the item.
-     * @param part The item.
+     * @param item The item.
      */
     public void registerCustomItem(@NotNull final NamespacedKey key,
-                                   @NotNull final CustomItem part) {
-        REGISTRY.put(key, part);
+                                   @NotNull final TestableItem item) {
+        REGISTRY.put(key, item);
+    }
+
+    /**
+     * Register a new item provider.
+     *
+     * @param provider The provider.
+     */
+    public void registerItemProvider(@NotNull final ItemProvider provider) {
+        PROVIDERS.put(provider.getNamespace(), provider);
     }
 
     /**
@@ -123,7 +139,20 @@ public final class Items {
         }
 
         if (split.length == 2) {
-            CustomItem part = REGISTRY.get(NamespacedKeyUtils.create(split[0], split[1]));
+            String namespace = split[0];
+            String keyID = split[1];
+            NamespacedKey namespacedKey = NamespacedKeyUtils.create(namespace, keyID);
+
+            TestableItem part = REGISTRY.get(namespacedKey);
+
+            if (part == null && PROVIDERS.containsKey(namespace)) {
+                ItemProvider provider = PROVIDERS.get(namespace);
+                item = provider.provideForKey(keyID);
+                if (item instanceof EmptyTestableItem || item == null) {
+                    return new EmptyTestableItem();
+                }
+                registerCustomItem(namespacedKey, item);
+            }
 
             /*
             Legacy id:amount format
@@ -146,7 +175,7 @@ public final class Items {
         This has been superseded by namespace:id amount
          */
         if (split.length == 3) {
-            CustomItem part = REGISTRY.get(NamespacedKeyUtils.create(split[0], split[1]));
+            TestableItem part = REGISTRY.get(NamespacedKeyUtils.create(split[0], split[1]));
             if (part == null) {
                 return new EmptyTestableItem();
             }
@@ -178,8 +207,11 @@ public final class Items {
         List<Predicate<ItemStack>> predicates = new ArrayList<>();
 
         for (LookupArgParser argParser : ARG_PARSERS) {
+            Predicate<ItemStack> predicate = argParser.parseArguments(modifierArgs, meta);
+            if (predicate != null) {
                 predicates.add(argParser.parseArguments(modifierArgs, meta));
             }
+        }
 
         example.setItemMeta(meta);
         if (!predicates.isEmpty()) {
@@ -212,7 +244,7 @@ public final class Items {
      * @return If is recipe.
      */
     public boolean isCustomItem(@NotNull final ItemStack itemStack) {
-        for (CustomItem item : REGISTRY.values()) {
+        for (TestableItem item : REGISTRY.values()) {
             if (item.matches(itemStack)) {
                 return true;
             }
@@ -228,9 +260,9 @@ public final class Items {
      */
     @Nullable
     public CustomItem getCustomItem(@NotNull final ItemStack itemStack) {
-        for (CustomItem item : REGISTRY.values()) {
+        for (TestableItem item : REGISTRY.values()) {
             if (item.matches(itemStack)) {
-                return item;
+                return getOrWrap(item);
             }
         }
         return null;
@@ -242,6 +274,27 @@ public final class Items {
      * @return A set of all items.
      */
     public Set<CustomItem> getCustomItems() {
-        return new HashSet<>(REGISTRY.values());
+        return REGISTRY.values().stream().map(Items::getOrWrap).collect(Collectors.toSet());
+    }
+
+    /**
+     * Return a CustomItem instance for a given TestableItem.
+     * <p>
+     * Used internally since 6.10.0 when the registration moved from {@link CustomItem}
+     * to {@link TestableItem} for added flexibility.
+     *
+     * @param item The item.
+     * @return The CustomItem.
+     */
+    public CustomItem getOrWrap(@NotNull final TestableItem item) {
+        if (item instanceof CustomItem) {
+            return (CustomItem) item;
+        } else {
+            return new CustomItem(
+                    NamespacedKeyUtils.createEcoKey("wrapped_" + NumberUtils.randInt(0, 100000)),
+                    item::matches,
+                    item.getItem()
+            );
+        }
     }
 }

eco-api/src/main/java/com/willfp/eco/core/items/args/EnchantmentArgParser.java

@@ -6,6 +6,7 @@ import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.EnchantmentStorageMeta;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -16,7 +17,7 @@ import java.util.function.Predicate;
  */
 public class EnchantmentArgParser implements LookupArgParser {
     @Override
-    public Predicate<ItemStack> parseArguments(@NotNull final String[] args,
+    public @Nullable Predicate<ItemStack> parseArguments(@NotNull final String[] args,
                                                          @NotNull final ItemMeta meta) {
         Map<Enchantment, Integer> requiredEnchantments = new HashMap<>();
 
@@ -37,6 +38,10 @@ public class EnchantmentArgParser implements LookupArgParser {
             requiredEnchantments.put(enchantment, level);
         }
 
+        if (requiredEnchantments.isEmpty()) {
+            return null;
+        }
+
         if (meta instanceof EnchantmentStorageMeta storageMeta) {
             requiredEnchantments.forEach((enchantment, integer) -> storageMeta.addStoredEnchant(enchantment, integer, true));
         } else {

eco-api/src/main/java/com/willfp/eco/core/items/args/LookupArgParser.java

@@ -4,6 +4,7 @@ import com.willfp.eco.core.items.TestableItem;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.function.Predicate;
 
@@ -19,6 +20,6 @@ public interface LookupArgParser {
      * @param meta The ItemMeta to modify.
      * @return The predicate test to apply to the modified item.
      */
-    Predicate<ItemStack> parseArguments(@NotNull String[] args,
+    @Nullable Predicate<ItemStack> parseArguments(@NotNull String[] args,
                                                   @NotNull ItemMeta meta);
 }

eco-api/src/main/java/com/willfp/eco/core/items/args/TextureArgParser.java

@@ -5,6 +5,7 @@ import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.bukkit.inventory.meta.SkullMeta;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.function.Predicate;
 
@@ -13,7 +14,7 @@ import java.util.function.Predicate;
  */
 public class TextureArgParser implements LookupArgParser {
     @Override
-    public Predicate<ItemStack> parseArguments(@NotNull final String[] args,
+    public @Nullable Predicate<ItemStack> parseArguments(@NotNull final String[] args,
                                                          @NotNull final ItemMeta meta) {
         String skullTexture = null;
 
@@ -34,6 +35,10 @@ public class TextureArgParser implements LookupArgParser {
             SkullUtils.setSkullTexture(skullMeta, skullTexture);
         }
 
+        if (skullTexture == null) {
+            return null;
+        }
+
         String finalSkullTexture = skullTexture;
         return test -> {
             if (!test.hasItemMeta()) {
@@ -44,7 +49,7 @@ public class TextureArgParser implements LookupArgParser {
 
             assert testMeta != null;
 
-            if (testMeta instanceof SkullMeta skullMeta && finalSkullTexture != null) {
+            if (testMeta instanceof SkullMeta skullMeta) {
                 return finalSkullTexture.equalsIgnoreCase(SkullUtils.getSkullTexture(skullMeta));
             }
 

eco-api/src/main/java/com/willfp/eco/core/items/provider/ItemProvider.java

@@ -0,0 +1,40 @@
+package com.willfp.eco.core.items.provider;
+
+import com.willfp.eco.core.items.TestableItem;
+import lombok.Getter;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Item providers are call-site registrations for items. In other words,
+ * they only register their items when a request is made. This is marginally
+ * slower, however it is required for certain plugins, and fixes bugs related to
+ * loading orders.
+ *
+ * @see TestableItem
+ */
+public abstract class ItemProvider {
+    /**
+     * The namespace.
+     */
+    @Getter
+    private final String namespace;
+
+    /**
+     * Create a new ItemProvider for a specific namespace.
+     *
+     * @param namespace The namespace.
+     */
+    protected ItemProvider(@NotNull final String namespace) {
+        this.namespace = namespace;
+    }
+
+    /**
+     * Provide a TestableItem for a given key.
+     *
+     * @param key The item ID.
+     * @return The TestableItem, or null if not found.
+     */
+    @Nullable
+    public abstract TestableItem provideForKey(@NotNull String key);
+}

eco-api/src/main/java/com/willfp/eco/core/recipe/recipes/ShapedCraftingRecipe.java

@@ -82,6 +82,10 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
         ShapedRecipe shapedRecipe = new ShapedRecipe(this.getKey(), this.getOutput());
         shapedRecipe.shape("012", "345", "678");
         for (int i = 0; i < 9; i++) {
+            if (parts.get(i) instanceof EmptyTestableItem) {
+                continue;
+            }
+
             char character = String.valueOf(i).toCharArray()[0];
             shapedRecipe.setIngredient(character, parts.get(i).getItem().getType());
         }
@@ -89,6 +93,10 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
         ShapedRecipe displayedRecipe = new ShapedRecipe(this.getDisplayedKey(), this.getOutput());
         displayedRecipe.shape("012", "345", "678");
         for (int i = 0; i < 9; i++) {
+            if (parts.get(i) instanceof EmptyTestableItem) {
+                continue;
+            }
+
             char character = String.valueOf(i).toCharArray()[0];
             ItemStack item = parts.get(i).getItem();
 

eco-api/src/main/java/com/willfp/eco/core/requirement/Requirement.java

@@ -0,0 +1,28 @@
+package com.willfp.eco.core.requirement;
+
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * A requirement is a defined goal that a player must meet.
+ */
+public abstract class Requirement {
+    /**
+     * Create a new requirement.
+     */
+    protected Requirement() {
+
+    }
+
+    /**
+     * Test if the player meets the requirement.
+     *
+     * @param player The player.
+     * @param args   The arguments.
+     * @return The requirement.
+     */
+    public abstract boolean doesPlayerMeet(@NotNull Player player,
+                                           @NotNull List<String> args);
+}

eco-api/src/main/java/com/willfp/eco/core/requirement/RequirementFactory.java

@@ -0,0 +1,17 @@
+package com.willfp.eco.core.requirement;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Interface for internal requirement factory implementations.
+ */
+public interface RequirementFactory {
+    /**
+     * Create a requirement.
+     *
+     * @param name The name.
+     * @return The requirement returned for the name.
+     * Will return a requirement that is always true if not found.
+     */
+    Requirement create(@NotNull String name);
+}

eco-api/src/main/java/com/willfp/eco/core/requirement/Requirements.java

@@ -0,0 +1,41 @@
+package com.willfp.eco.core.requirement;
+
+import com.willfp.eco.core.Eco;
+import lombok.experimental.UtilityClass;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Contains methods and fields pertaining to requirements.
+ */
+@UtilityClass
+public class Requirements {
+    /**
+     * Requires a player to have a permission.
+     */
+    public static final Requirement HAS_PERMISSION = Eco.getHandler().getRequirementFactory().create("has-permission");
+
+    /**
+     * Placeholder equals value.
+     */
+    public static final Requirement PLACEHOLDER_EQUALS = Eco.getHandler().getRequirementFactory().create("placeholder-equals");
+
+    /**
+     * Numeric placeholder greater than value.
+     */
+    public static final Requirement PLACEHOLDER_GREATER_THAN = Eco.getHandler().getRequirementFactory().create("placeholder-greater-than");
+
+    /**
+     * Numeric placeholder less than value.
+     */
+    public static final Requirement PLACEHOLDER_LESS_THAN = Eco.getHandler().getRequirementFactory().create("placeholder-less-than");
+
+    /**
+     * Get Requirements matching ID.
+     *
+     * @param name The ID to search for.
+     * @return The matching Requirements.
+     */
+    public static Requirement getByID(@NotNull final String name) {
+        return Eco.getHandler().getRequirementFactory().create(name);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/tuples/Pair.java

@@ -38,4 +38,26 @@ public class Pair<A, B> {
         this.first = first;
         this.second = second;
     }
+
+    /**
+     * component1 exists to allow a pair to be destructured by kotlin.
+     * The default kotlin pair already has this, however there is no default
+     * pair in java so this exists for parity.
+     *
+     * @return First.
+     */
+    public A component1() {
+        return first;
+    }
+
+    /**
+     * component2 exists to allow a pair to be destructured by kotlin.
+     * The default kotlin pair already has this, however there is no default
+     * pair in java so this exists for parity.
+     *
+     * @return First.
+     */
+    public B component2() {
+        return second;
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/tuples/Triplet.java

@@ -34,4 +34,15 @@ public class Triplet<A, B, C> extends Pair<A, B> {
 
         this.third = third;
     }
+
+    /**
+     * component3 exists to allow a pair to be destructured by kotlin.
+     * The default kotlin pair already has this, however there is no default
+     * pair in java so this exists for parity.
+     *
+     * @return First.
+     */
+    public C component3() {
+        return third;
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/web/Paste.java

@@ -4,6 +4,7 @@ import com.willfp.eco.core.Eco;
 import lombok.Getter;
 import org.jetbrains.annotations.NotNull;
 
+import javax.net.ssl.HttpsURLConnection;
 import java.io.BufferedReader;
 import java.io.DataOutputStream;
 import java.io.IOException;
@@ -11,7 +12,6 @@ import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.net.URLDecoder;
-import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
 import java.util.function.Consumer;
 
@@ -40,45 +40,42 @@ public class Paste {
      * <p>
      * Runs asynchronously to avoid hangups.
      *
-     * @param responseHandler The consumer to accept the response token.
+     * @param callback The consumer to accept the response token.
      */
-    public void getHastebinToken(@NotNull final Consumer<String> responseHandler) {
+    public void getHastebinToken(@NotNull final Consumer<String> callback) {
         Eco.getHandler().getEcoPlugin().getScheduler().runAsync(() -> {
             try {
-                String url = "https://hastebin.com/documents";
-                URL obj = new URL(url);
-                HttpURLConnection con = (HttpURLConnection) obj.openConnection();
+                byte[] postData = contents.getBytes(StandardCharsets.UTF_8);
+                int postDataLength = postData.length;
 
-                con.setRequestMethod("POST");
-                con.setRequestProperty("Content-Type", "application/json");
+                String requestURL = "https://hastebin.com/documents";
+                URL url = new URL(requestURL);
+                HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
+                conn.setDoOutput(true);
+                conn.setInstanceFollowRedirects(false);
+                conn.setRequestMethod("POST");
+                conn.setRequestProperty("User-Agent", "eco-Hastebin");
+                conn.setRequestProperty("Content-Length", Integer.toString(postDataLength));
+                conn.setUseCaches(false);
 
-                con.setDoOutput(true);
-                DataOutputStream wr = new DataOutputStream(con.getOutputStream());
-                wr.writeBytes(URLEncoder.encode(contents, StandardCharsets.UTF_8));
-                wr.flush();
-                wr.close();
+                String response;
+                DataOutputStream wr;
 
-                BufferedReader iny = new BufferedReader(
-                        new InputStreamReader(con.getInputStream()));
-                String output;
-                StringBuilder responseBuilder = new StringBuilder();
+                wr = new DataOutputStream(conn.getOutputStream());
+                wr.write(postData);
+                BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
+                response = reader.readLine();
 
-                while ((output = iny.readLine()) != null) {
-                    responseBuilder.append(output);
+                assert response != null;
+
+                if (response.contains("\"key\"")) {
+                    response = response.substring(response.indexOf(":") + 2, response.length() - 2);
+
+                    callback.accept(response);
                 }
-                iny.close();
-
-                String responseString = responseBuilder.toString();
-
-                responseString = responseString.replace("{\"key\":\"", "");
-                responseString = responseString.replace("\"}", "");
-
-                responseHandler.accept(responseString);
             } catch (IOException e) {
-                responseHandler.accept(e.getMessage());
+                callback.accept(e.getMessage());
             }
-
-            responseHandler.accept("");
         });
     }
 

eco-api/src/main/java/com/willfp/eco/core/web/UpdateChecker.java

@@ -26,16 +26,18 @@ public class UpdateChecker extends PluginDependent<EcoPlugin> {
     /**
      * Get the latest version of the plugin.
      *
-     * @param consumer The process to run after checking.
+     * @param callback The process to run after checking.
      */
-    public void getVersion(@NotNull final Consumer<? super String> consumer) {
+    public void getVersion(@NotNull final Consumer<? super String> callback) {
         this.getPlugin().getScheduler().runAsync(() -> {
             try {
-                InputStream inputStream = new URL("https://api.spigotmc.org/legacy/update.php?resource=" + this.getPlugin().getResourceId()).openStream();
+                InputStream inputStream = new URL(
+                        "https://api.polymart.org/v1/getResourceInfoSimple?key=version&resource_id=" + this.getPlugin().getResourceId()
+                ).openStream();
                 Scanner scanner = new Scanner(inputStream);
 
                 if (scanner.hasNext()) {
-                    consumer.accept(scanner.next());
+                    callback.accept(scanner.next());
                 }
             } catch (IOException e) {
                 this.getPlugin().getLogger().warning("Failed to check for updates: " + e.getMessage());

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

@@ -2,12 +2,14 @@ package com.willfp.eco.util;
 
 import lombok.experimental.UtilityClass;
 import org.apache.commons.lang.Validate;
+import org.bukkit.Chunk;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.World;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
 import org.bukkit.entity.Player;
+import org.bukkit.persistence.PersistentDataType;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
@@ -92,6 +94,21 @@ public class BlockUtils {
         blockBreakConsumer.accept(player, block);
     }
 
+    /**
+     * Get if a block was placed by a player.
+     *
+     * @param block The block.
+     * @return If placed by a player.
+     */
+    public boolean isPlayerPlaced(@NotNull final Block block) {
+        Chunk chunk = block.getChunk();
+
+        return chunk.getPersistentDataContainer().has(
+                NamespacedKeyUtils.createEcoKey(Integer.toString(block.getLocation().hashCode(), 16)),
+                PersistentDataType.INTEGER
+        );
+    }
+
     /**
      * Initialize the block break function.
      *

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

@@ -2,6 +2,7 @@ package com.willfp.eco.util;
 
 import lombok.experimental.UtilityClass;
 import org.bukkit.Location;
+import org.bukkit.Sound;
 import org.bukkit.entity.LivingEntity;
 import org.jetbrains.annotations.NotNull;
 
@@ -10,18 +11,37 @@ import org.jetbrains.annotations.NotNull;
  */
 @UtilityClass
 public class LightningUtils {
+
     /**
      * Strike lightning on player without fire.
      *
      * @param victim The entity to smite.
      * @param damage The damage to deal.
+     * @param silent If the lightning sound should be played locally
+     */
+    public void strike(@NotNull final LivingEntity victim,
+                       final double damage,
+                       final boolean silent) {
+        Location loc = victim.getLocation();
+
+        if (silent) {
+            victim.getWorld().spigot().strikeLightningEffect(loc, true);
+            victim.getWorld().playSound(loc, Sound.ENTITY_LIGHTNING_BOLT_IMPACT, 1, 1);
+        } else {
+            victim.getWorld().strikeLightningEffect(loc);
+        }
+
+        victim.damage(damage);
+    }
+
+    /**
+     * Strike lightning on a victim without fire.
+     *
+     * @param victim The entity to smite.
+     * @param damage The damage to deal.
      */
     public void strike(@NotNull final LivingEntity victim,
                        final double damage) {
-        Location loc = victim.getLocation();
-
-        victim.getWorld().strikeLightningEffect(loc);
-
-        victim.damage(damage);
+        strike(victim, damage, false);
     }
 }

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

@@ -5,7 +5,9 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 /**
  * Utilities / API methods for lists.
@@ -21,7 +23,7 @@ public class ListUtils {
      * @return The list, filled will null objects.
      */
     @NotNull
-    public <@Nullable T> List<List<T>> create2DList(final int rows,
+    public static <@Nullable T> List<List<T>> create2DList(final int rows,
                                                            final int columns) {
         List<List<T>> list = new ArrayList<>(rows);
         while (list.size() < rows) {
@@ -34,4 +36,25 @@ public class ListUtils {
 
         return list;
     }
+
+    /**
+     * Convert a list potentially containing duplicates to a map where the value is the frequency of the key.
+     *
+     * @param list The list.
+     * @param <T>  The type parameter of the list.
+     * @return The frequency map.
+     */
+    @NotNull
+    public static <T> Map<T, Integer> listToFrequencyMap(@NotNull final List<T> list) {
+        Map<T, Integer> frequencyMap = new HashMap<>();
+        for (T object : list) {
+            if (frequencyMap.containsKey(object)) {
+                frequencyMap.put(object, frequencyMap.get(object) + 1);
+            } else {
+                frequencyMap.put(object, 1);
+            }
+        }
+
+        return frequencyMap;
+    }
 }

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

@@ -1,6 +1,5 @@
 package com.willfp.eco.util;
 
-import lombok.experimental.NonFinal;
 import lombok.experimental.UtilityClass;
 import org.jetbrains.annotations.NotNull;
 

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

@@ -0,0 +1,105 @@
+package com.willfp.eco.util;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.Prerequisite;
+import com.willfp.eco.core.data.PlayerProfile;
+import com.willfp.eco.core.data.keys.PersistentDataKey;
+import com.willfp.eco.core.data.keys.PersistentDataKeyType;
+import lombok.experimental.UtilityClass;
+import net.kyori.adventure.audience.Audience;
+import net.kyori.adventure.platform.bukkit.BukkitAudiences;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Utilities / API methods for players.
+ */
+@UtilityClass
+public class PlayerUtils {
+    /**
+     * The data key for saved player names.
+     */
+    private static final PersistentDataKey<String> PLAYER_NAME_KEY = new PersistentDataKey<>(
+            NamespacedKeyUtils.createEcoKey("player_name"),
+            PersistentDataKeyType.STRING,
+            "Unknown Player"
+    );
+
+    /**
+     * Get the audience from a player.
+     *
+     * @param player The player.
+     * @return The audience.
+     */
+    @NotNull
+    public Audience getAudience(@NotNull final Player player) {
+        BukkitAudiences adventure = Eco.getHandler().getAdventure();
+
+        if (Prerequisite.HAS_PAPER.isMet()) {
+            if (player instanceof Audience) {
+                return (Audience) player;
+            } else {
+                return Audience.empty();
+            }
+        } else {
+            if (adventure == null) {
+                return Audience.empty();
+            } else {
+                return adventure.player(player);
+            }
+        }
+    }
+
+    /**
+     * Get the audience from a command sender.
+     *
+     * @param sender The command sender.
+     * @return The audience.
+     */
+    @NotNull
+    public Audience getAudience(@NotNull final CommandSender sender) {
+        BukkitAudiences adventure = Eco.getHandler().getAdventure();
+
+        if (Prerequisite.HAS_PAPER.isMet()) {
+            if (sender instanceof Audience) {
+                return (Audience) sender;
+            } else {
+                return Audience.empty();
+            }
+        } else {
+            if (adventure == null) {
+                return Audience.empty();
+            } else {
+                return adventure.sender(sender);
+            }
+        }
+    }
+
+    /**
+     * Get saved display name for an offline player.
+     *
+     * @param player The player.
+     * @return The player name.
+     */
+    public String getSavedDisplayName(@NotNull final OfflinePlayer player) {
+        PlayerProfile profile = PlayerProfile.load(player);
+
+        if (player instanceof Player onlinePlayer) {
+            profile.write(PLAYER_NAME_KEY, onlinePlayer.getDisplayName());
+        }
+
+        return profile.read(PLAYER_NAME_KEY);
+    }
+
+    /**
+     * Update the saved display name for a player.
+     *
+     * @param player The player.
+     */
+    public void updateSavedDisplayName(@NotNull final Player player) {
+        PlayerProfile profile = PlayerProfile.load(player);
+        profile.write(PLAYER_NAME_KEY, player.getDisplayName());
+    }
+}

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

@@ -0,0 +1,47 @@
+package com.willfp.eco.util;
+
+import lombok.experimental.UtilityClass;
+import org.bukkit.potion.PotionData;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Utilities / API methods for potions.
+ */
+@UtilityClass
+public class PotionUtils {
+    /**
+     * Get the duration (in ticks) for potion data.
+     *
+     * @param data The data.
+     * @return The duration.
+     */
+    public int getDuration(@NotNull final PotionData data) {
+        if (data.isExtended()) {
+            return switch (data.getType()) {
+                case INSTANT_DAMAGE, INSTANT_HEAL: yield 0;
+                case POISON, REGEN: yield 1800;
+                case SLOW_FALLING, WEAKNESS, SLOWNESS: yield 4800;
+                case TURTLE_MASTER: yield 800;
+                default: yield 9600;
+            };
+        }
+
+        if (data.isUpgraded()) {
+            return switch (data.getType()) {
+                case INSTANT_DAMAGE, INSTANT_HEAL: yield 0;
+                case POISON, REGEN: yield 420;
+                case SLOW_FALLING, WEAKNESS, SLOWNESS: yield 440;
+                case TURTLE_MASTER: yield 400;
+                default: yield 1800;
+            };
+        }
+
+        return switch (data.getType()) {
+            case INSTANT_DAMAGE, INSTANT_HEAL: yield 0;
+            case POISON, REGEN: yield 900;
+            case SLOW_FALLING, WEAKNESS, SLOWNESS: yield 400;
+            case TURTLE_MASTER: yield 1800;
+            default: yield 3600;
+        };
+    }
+}

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

@@ -0,0 +1,48 @@
+package com.willfp.eco.util;
+
+import lombok.experimental.UtilityClass;
+import org.apache.commons.lang.Validate;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.function.Supplier;
+
+/**
+ * Utilities / API methods for the server.
+ */
+@UtilityClass
+public class ServerUtils {
+    /**
+     * The TPS supplier.
+     */
+    private Supplier<Double> tpsSupplier = null;
+
+    /**
+     * Get the current server TPS.
+     *
+     * @return The TPS.
+     */
+    public double getTps() {
+        Validate.notNull(tpsSupplier, "Not initialized!");
+
+        double tps = tpsSupplier.get();
+
+        if (tps > 20) {
+            return 20;
+        } else {
+            return tps;
+        }
+    }
+
+    /**
+     * Initialize the tps supplier function.
+     *
+     * @param function The function.
+     */
+    @ApiStatus.Internal
+    public void initialize(@NotNull final Supplier<Double> function) {
+        Validate.isTrue(tpsSupplier == null, "Already initialized!");
+
+        tpsSupplier = function;
+    }
+}

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

@@ -1,10 +1,14 @@
 package com.willfp.eco.util;
 
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.willfp.eco.core.Prerequisite;
 import com.willfp.eco.core.integrations.placeholder.PlaceholderManager;
 import lombok.experimental.UtilityClass;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.format.TextDecoration;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import net.kyori.adventure.text.minimessage.markdown.DiscordFlavor;
 import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
 import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
 import net.md_5.bungee.api.ChatColor;
@@ -16,11 +20,17 @@ import java.awt.Color;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
+import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
+import static net.md_5.bungee.api.ChatColor.BOLD;
 import static net.md_5.bungee.api.ChatColor.COLOR_CHAR;
+import static net.md_5.bungee.api.ChatColor.ITALIC;
+import static net.md_5.bungee.api.ChatColor.MAGIC;
+import static net.md_5.bungee.api.ChatColor.STRIKETHROUGH;
+import static net.md_5.bungee.api.ChatColor.UNDERLINE;
 
 /**
  * Utilities / API methods for strings.
@@ -34,6 +44,8 @@ public class StringUtils {
             .add(Pattern.compile("<GRADIENT:([0-9A-Fa-f]{6})>(.*?)</GRADIENT:([0-9A-Fa-f]{6})>", Pattern.CASE_INSENSITIVE))
             .add(Pattern.compile("<GRADIENT:#([0-9A-Fa-f]{6})>(.*?)</GRADIENT:#([0-9A-Fa-f]{6})>", Pattern.CASE_INSENSITIVE))
             .add(Pattern.compile("<G:([0-9A-Fa-f]{6})>(.*?)</G:([0-9A-Fa-f]{6})>", Pattern.CASE_INSENSITIVE))
+            .add(Pattern.compile("<G:#([0-9A-Fa-f]{6})>(.*?)</G:#([0-9A-Fa-f]{6})>", Pattern.CASE_INSENSITIVE))
+            .add(Pattern.compile("<G#([0-9A-Fa-f]{6})>(.*?)</G#([0-9A-Fa-f]{6})>", Pattern.CASE_INSENSITIVE))
             .add(Pattern.compile("<#:([0-9A-Fa-f]{6})>(.*?)</#:([0-9A-Fa-f]{6})>"))
             .add(Pattern.compile("\\{#:([0-9A-Fa-f]{6})}(.*?)\\{/#:([0-9A-Fa-f]{6})}"))
             .build();
@@ -56,6 +68,22 @@ public class StringUtils {
             .hexColors()
             .build();
 
+    /**
+     * Color map.
+     */
+    private static final Map<String, ChatColor> COLOR_MAP = new ImmutableMap.Builder<String, ChatColor>()
+            .put("&l", BOLD)
+            .put("&o", ITALIC)
+            .put("&n", UNDERLINE)
+            .put("&m", STRIKETHROUGH)
+            .put("&k", MAGIC)
+            .put("§l", BOLD)
+            .put("§o", ITALIC)
+            .put("§n", UNDERLINE)
+            .put("§m", STRIKETHROUGH)
+            .put("§k", MAGIC)
+            .build();
+
     /**
      * Format a list of strings.
      * <p>
@@ -166,6 +194,68 @@ public class StringUtils {
         return format(message, null, option);
     }
 
+    /**
+     * Format a string to a component.
+     * <p>
+     * Converts color codes and placeholders.
+     *
+     * @param message The message to translate.
+     * @return The message, formatted, as a component.
+     * @see StringUtils#format(String, Player)
+     */
+    @NotNull
+    public Component formatToComponent(@NotNull final String message) {
+        return formatToComponent(message, (Player) null);
+    }
+
+    /**
+     * Format a string.
+     * <p>
+     * Converts color codes and placeholders for a player.
+     *
+     * @param message The message to format.
+     * @param player  The player to translate placeholders with respect to.
+     * @return The message, formatted.
+     */
+    @NotNull
+    public Component formatToComponent(@NotNull final String message,
+                                       @Nullable final Player player) {
+        return formatToComponent(message, player, FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Format a string to a component.
+     * <p>
+     * Converts color codes and placeholders if specified.
+     *
+     * @param message The message to translate.
+     * @param option  The format option.
+     * @return The message, formatted, as a component.
+     * @see StringUtils#format(String, Player)
+     */
+    @NotNull
+    public Component formatToComponent(@NotNull final String message,
+                                       @NotNull final FormatOption option) {
+        return formatToComponent(message, null, option);
+    }
+
+    /**
+     * Format a string to a component.
+     * <p>
+     * Coverts color codes and placeholders for a player if specified.
+     *
+     * @param message The message to format.
+     * @param player  The player to translate placeholders with respect to.
+     * @param option  The format options.
+     * @return The message, formatted, as a component.
+     */
+    @NotNull
+    public Component formatToComponent(@NotNull final String message,
+                                       @Nullable final Player player,
+                                       @NotNull final FormatOption option) {
+        return toComponent(format(message, player, option));
+    }
+
     /**
      * Format a string.
      * <p>
@@ -181,15 +271,22 @@ public class StringUtils {
                          @Nullable final Player player,
                          @NotNull final FormatOption option) {
         String processedMessage = message;
-        processedMessage = translateGradients(processedMessage);
         if (option == FormatOption.WITH_PLACEHOLDERS) {
             processedMessage = PlaceholderManager.translatePlaceholders(processedMessage, player);
         }
-        processedMessage = translateHexColorCodes(processedMessage);
         processedMessage = ChatColor.translateAlternateColorCodes('&', processedMessage);
+        processedMessage = translateGradients(processedMessage);
+        processedMessage = translateHexColorCodes(processedMessage);
+        if (Prerequisite.HAS_PAPER.isMet()) {
+            processedMessage = translateMiniMessage(processedMessage);
+        }
         return processedMessage;
     }
 
+    private static String translateMiniMessage(@NotNull final String message) {
+        return LEGACY_COMPONENT_SERIALIZER.serialize(MiniMessage.withMarkdownFlavor(DiscordFlavor.get()).parse(message));
+    }
+
     private static String translateHexColorCodes(@NotNull final String message) {
         String processedMessage = message;
         for (Pattern pattern : HEX_PATTERNS) {
@@ -219,26 +316,12 @@ public class StringUtils {
                                            @NotNull final Color end) {
         String processedString = string;
         List<ChatColor> modifiers = new ArrayList<>();
-        if (processedString.contains("&l")) {
-            modifiers.add(ChatColor.BOLD);
+        for (Map.Entry<String, ChatColor> entry : COLOR_MAP.entrySet()) {
+            if (processedString.contains(entry.getKey())) {
+                modifiers.add(entry.getValue());
             }
-        if (processedString.contains("&o")) {
-            modifiers.add(ChatColor.ITALIC);
+            processedString = processedString.replace(entry.getKey(), "");
         }
-        if (processedString.contains("&n")) {
-            modifiers.add(ChatColor.UNDERLINE);
-        }
-        if (processedString.contains("&m")) {
-            modifiers.add(ChatColor.STRIKETHROUGH);
-        }
-        if (processedString.contains("&k")) {
-            modifiers.add(ChatColor.MAGIC);
-        }
-        processedString = processedString.replace("&l", "");
-        processedString = processedString.replace("&o", "");
-        processedString = processedString.replace("&n", "");
-        processedString = processedString.replace("&k", "");
-        processedString = processedString.replace("&m", "");
 
         StringBuilder stringBuilder = new StringBuilder();
         ChatColor[] colors = getGradientColors(start, end, processedString.length());
@@ -255,6 +338,9 @@ public class StringUtils {
                                                  @NotNull final Color end,
                                                  final int step) {
         ChatColor[] colors = new ChatColor[step];
+        if (step <= 1) {
+            return colors;
+        }
         int stepR = Math.abs(start.getRed() - end.getRed()) / (step - 1);
         int stepG = Math.abs(start.getGreen() - end.getGreen()) / (step - 1);
         int stepB = Math.abs(start.getBlue() - end.getBlue()) / (step - 1);
@@ -334,10 +420,14 @@ public class StringUtils {
      * @return The JSON String.
      */
     @NotNull
-    public String legacyToJson(@NotNull final String legacy) {
+    public String legacyToJson(@Nullable final String legacy) {
+        String processed = legacy;
+        if (legacy == null) {
+            processed = "";
+        }
         return GsonComponentSerializer.gson().serialize(
                 Component.empty().decoration(TextDecoration.ITALIC, false).append(
-                        LEGACY_COMPONENT_SERIALIZER.deserialize(legacy)
+                        LEGACY_COMPONENT_SERIALIZER.deserialize(processed)
                 )
         );
     }
@@ -355,6 +445,33 @@ public class StringUtils {
         );
     }
 
+    /**
+     * Convert legacy (bukkit) text to Component.
+     *
+     * @param legacy The legacy text.
+     * @return The component.
+     */
+    @NotNull
+    public Component toComponent(@Nullable final String legacy) {
+        String processed = legacy;
+        if (legacy == null) {
+            processed = "";
+        }
+
+        return LEGACY_COMPONENT_SERIALIZER.deserialize(processed);
+    }
+
+    /**
+     * Convert Component to legacy (bukkit) text.
+     *
+     * @param component The component.
+     * @return The legacy text.
+     */
+    @NotNull
+    public String toLegacy(@NotNull final Component component) {
+        return LEGACY_COMPONENT_SERIALIZER.serialize(component);
+    }
+
     /**
      * Options for formatting.
      */

eco-core/build.gradle

@@ -4,7 +4,7 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.21"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.31"
     }
 }
 
@@ -16,6 +16,14 @@ subprojects {
 
     dependencies {
         compileOnly project(":eco-api")
-        compileOnly 'org.jetbrains.kotlin:kotlin-stdlib:1.5.21'
+        compileOnly 'org.jetbrains.kotlin:kotlin-stdlib:1.5.31'
+    }
+
+    compileKotlin {
+        kotlinOptions {
+            jvmTarget = "16"
+        }
+        targetCompatibility = JavaVersion.VERSION_16
+        sourceCompatibility = JavaVersion.VERSION_16
     }
 }

eco-core/core-backend/build.gradle

@@ -2,7 +2,10 @@ group 'com.willfp'
 version rootProject.version
 
 dependencies {
-    compileOnly 'org.spigotmc:spigot-api:1.17-R0.1-SNAPSHOT'
-    compileOnly 'me.clip:placeholderapi:2.10.9'
+    compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
+    compileOnly 'me.clip:placeholderapi:2.10.10'
     compileOnly 'org.reflections:reflections:0.9.12'
+    compileOnly 'net.kyori:adventure-text-minimessage:4.1.0-SNAPSHOT'
+    compileOnly 'net.kyori:adventure-platform-bukkit:4.0.0'
+    compileOnly 'com.google.guava:guava:31.0.1-jre'
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoConfigFactory.kt

@@ -1,11 +1,12 @@
 package com.willfp.eco.internal.config
 
-import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginLike
 import com.willfp.eco.core.config.interfaces.Config
 import com.willfp.eco.core.config.interfaces.JSONConfig
 import com.willfp.eco.core.config.wrapper.ConfigFactory
 import com.willfp.eco.internal.config.json.EcoJSONConfigSection
 import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig
+import com.willfp.eco.internal.config.json.EcoUpdatableJSONConfig
 import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig
 import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig
 import com.willfp.eco.internal.config.yaml.EcoYamlConfigSection
@@ -14,7 +15,7 @@ import org.bukkit.configuration.file.YamlConfiguration
 class EcoConfigFactory : ConfigFactory {
     override fun createUpdatableYamlConfig(
         configName: String,
-        plugin: EcoPlugin,
+        plugin: PluginLike,
         subDirectoryPath: String,
         source: Class<*>,
         removeUnused: Boolean,
@@ -30,9 +31,27 @@ class EcoConfigFactory : ConfigFactory {
         )
     }
 
+    override fun createUpdatableJSONConfig(
+        configName: String,
+        plugin: PluginLike,
+        subDirectoryPath: String,
+        source: Class<*>,
+        removeUnused: Boolean,
+        vararg updateBlacklist: String
+    ): JSONConfig {
+        return EcoUpdatableJSONConfig(
+            configName,
+            plugin,
+            subDirectoryPath,
+            source,
+            removeUnused,
+            *updateBlacklist
+        )
+    }
+
     override fun createLoadableJSONConfig(
         configName: String,
-        plugin: EcoPlugin,
+        plugin: PluginLike,
         subDirectoryPath: String,
         source: Class<*>
     ): JSONConfig {
@@ -46,7 +65,7 @@ class EcoConfigFactory : ConfigFactory {
 
     override fun createLoadableYamlConfig(
         configName: String,
-        plugin: EcoPlugin,
+        plugin: PluginLike,
         subDirectoryPath: String,
         source: Class<*>
     ): Config {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.kt

@@ -4,16 +4,16 @@ import com.google.gson.Gson
 import com.google.gson.GsonBuilder
 import com.willfp.eco.core.config.interfaces.JSONConfig
 import com.willfp.eco.util.StringUtils
-import org.apache.commons.lang.Validate
 import java.util.*
+import java.util.concurrent.ConcurrentHashMap
 
 @Suppress("UNCHECKED_CAST")
 open class EcoJSONConfigWrapper : JSONConfig {
     val handle: Gson = GsonBuilder().setPrettyPrinting().create()
 
-    val values = mutableMapOf<String, Any?>()
+    val values = ConcurrentHashMap<String, Any?>()
 
-    private val cache = mutableMapOf<String, Any>()
+    private val cache = ConcurrentHashMap<String, Any>()
 
     fun init(values: Map<String, Any?>) {
         this.values.clear()
@@ -123,8 +123,7 @@ open class EcoJSONConfigWrapper : JSONConfig {
 
     override fun getSubsection(path: String): JSONConfig {
         val subsection = getSubsectionOrNull(path)
-        Validate.notNull(subsection)
-        return subsection!!
+        return subsection ?: EcoJSONConfigSection(emptyMap())
     }
 
     override fun getSubsectionOrNull(path: String): JSONConfig? {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoLoadableJSONConfig.kt

@@ -1,18 +1,22 @@
 package com.willfp.eco.internal.config.json
 
-import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginLike
 import com.willfp.eco.core.config.interfaces.LoadableConfig
-import org.jetbrains.annotations.NotNull
-import java.io.*
+import java.io.File
+import java.io.FileNotFoundException
+import java.io.FileOutputStream
+import java.io.FileReader
+import java.io.IOException
+import java.io.OutputStream
 import java.nio.file.Files
 import java.nio.file.StandardOpenOption
 
 @Suppress("UNCHECKED_CAST")
-class EcoLoadableJSONConfig(
+open class EcoLoadableJSONConfig(
     configName: String,
-    private val plugin: EcoPlugin,
+    private val plugin: PluginLike,
     private val subDirectoryPath: String,
-    private val source: Class<*>
+    val source: Class<*>
 ) : EcoJSONConfigWrapper(), LoadableConfig {
 
     private val configFile: File
@@ -65,7 +69,7 @@ class EcoLoadableJSONConfig(
 
     @Throws(FileNotFoundException::class)
     fun init(file: File) {
-        super.init(handle.fromJson(FileReader(file), Map::class.java) as @NotNull MutableMap<String, Any>)
+        super.init(handle.fromJson(FileReader(file), Map::class.java) as MutableMap<String, Any>)
     }
 
     override fun getName(): String {
@@ -77,7 +81,7 @@ class EcoLoadableJSONConfig(
     }
 
     init {
-        val directory: File = File(this.plugin.dataFolder, subDirectoryPath)
+        val directory = File(this.plugin.dataFolder, subDirectoryPath)
         if (!directory.exists()) {
             directory.mkdirs()
         }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoUpdatableJSONConfig.kt

@@ -0,0 +1,74 @@
+package com.willfp.eco.internal.config.json
+
+import com.willfp.eco.core.PluginLike
+import org.bukkit.configuration.InvalidConfigurationException
+import org.bukkit.configuration.file.YamlConfiguration
+import java.io.BufferedReader
+import java.io.IOException
+import java.io.InputStreamReader
+import java.nio.charset.StandardCharsets
+
+open class EcoUpdatableJSONConfig(
+    configName: String,
+    plugin: PluginLike,
+    subDirectoryPath: String,
+    source: Class<*>,
+    private val removeUnused: Boolean,
+    vararg updateBlacklist: String
+) : EcoLoadableJSONConfig(configName, plugin, subDirectoryPath, source) {
+
+    private val updateBlacklist: MutableList<String> = mutableListOf(*updateBlacklist)
+
+    fun update() {
+        super.clearCache()
+        try {
+            this.init(configFile)
+            val newConfig = configInJar
+            if (newConfig.getKeys(true) == this.getKeys(true)) {
+                return
+            }
+            newConfig.getKeys(true).forEach { key: String ->
+                if (!this.getKeys(true).contains(key)) {
+                    if (updateBlacklist.stream().noneMatch { s: String -> key.contains(s) }) {
+                        this.set(key, newConfig[key])
+                    }
+                }
+            }
+            if (removeUnused) {
+                this.getKeys(true).forEach { s ->
+                    if (!newConfig.getKeys(true).contains(s)) {
+                        if (updateBlacklist.stream().noneMatch(s::contains)) {
+                            this.set(s, null)
+                        }
+                    }
+                }
+            }
+            this.save()
+        } catch (e: IOException) {
+            e.printStackTrace()
+        } catch (e: InvalidConfigurationException) {
+            e.printStackTrace()
+        }
+    }
+
+    private val configInJar: YamlConfiguration
+        get() {
+            val newIn = this.source.getResourceAsStream(resourcePath) ?: throw NullPointerException("$name is null?")
+            val reader = BufferedReader(InputStreamReader(newIn, StandardCharsets.UTF_8))
+            val newConfig = YamlConfiguration()
+            try {
+                newConfig.load(reader)
+            } catch (e: IOException) {
+                e.printStackTrace()
+            } catch (e: InvalidConfigurationException) {
+                e.printStackTrace()
+            }
+            return newConfig
+        }
+
+    init {
+        this.updateBlacklist.removeIf { obj: String -> obj.isEmpty() }
+        plugin.configHandler.addConfig(this)
+        update()
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/updating/EcoConfigHandler.kt

@@ -5,12 +5,12 @@ import com.willfp.eco.core.config.interfaces.LoadableConfig
 import com.willfp.eco.core.config.updating.ConfigHandler
 import com.willfp.eco.core.config.updating.ConfigUpdater
 import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig
+import com.willfp.eco.internal.config.json.EcoUpdatableJSONConfig
 import com.willfp.eco.internal.config.updating.exceptions.InvalidUpdateMethodException
 import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig
 import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig
 import org.reflections.Reflections
 import org.reflections.scanners.MethodAnnotationsScanner
-import java.lang.reflect.Modifier
 
 class EcoConfigHandler(
     private val plugin: EcoPlugin
@@ -24,10 +24,6 @@ class EcoConfigHandler(
 
     override fun callUpdate() {
         for (method in reflections.getMethodsAnnotatedWith(ConfigUpdater::class.java)) {
-            if (!Modifier.isStatic(method.modifiers)) {
-                throw InvalidUpdateMethodException("Update method in ${method.declaringClass.name} must be static.")
-            }
-
             try {
                 when (method.parameterCount) {
                     0 -> method.invoke(null)
@@ -55,6 +51,7 @@ class EcoConfigHandler(
         for (config in configs) {
             when (config) {
                 is EcoUpdatableYamlConfig -> config.update()
+                is EcoUpdatableJSONConfig -> config.update()
                 is EcoLoadableYamlConfig -> config.reloadFromFile()
                 is EcoLoadableJSONConfig -> config.reloadFromFile()
             }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoLoadableYamlConfig.kt

@@ -1,6 +1,6 @@
 package com.willfp.eco.internal.config.yaml
 
-import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginLike
 import com.willfp.eco.core.config.interfaces.LoadableConfig
 import com.willfp.eco.core.config.interfaces.WrappedYamlConfiguration
 import org.bukkit.configuration.InvalidConfigurationException
@@ -12,7 +12,7 @@ import java.io.OutputStream
 
 open class EcoLoadableYamlConfig(
     configName: String,
-    private val plugin: EcoPlugin,
+    private val plugin: PluginLike,
     private val subDirectoryPath: String,
     val source: Class<*>
 ) : EcoYamlConfigWrapper<YamlConfiguration>(), WrappedYamlConfiguration, LoadableConfig {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoUpdatableYamlConfig.kt

@@ -1,6 +1,6 @@
 package com.willfp.eco.internal.config.yaml
 
-import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginLike
 import org.bukkit.configuration.InvalidConfigurationException
 import org.bukkit.configuration.file.YamlConfiguration
 import java.io.BufferedReader
@@ -10,7 +10,7 @@ import java.nio.charset.StandardCharsets
 
 class EcoUpdatableYamlConfig(
     configName: String,
-    plugin: EcoPlugin,
+    plugin: PluginLike,
     subDirectoryPath: String,
     source: Class<*>,
     private val removeUnused: Boolean,
@@ -27,9 +27,9 @@ class EcoUpdatableYamlConfig(
             if (newConfig.getKeys(true) == this.handle.getKeys(true)) {
                 return
             }
-            newConfig.getKeys(true).forEach { key: String ->
+            newConfig.getKeys(true).forEach { key ->
                 if (!this.handle.getKeys(true).contains(key)) {
-                    if (updateBlacklist.stream().noneMatch { s: String -> key.contains(s) }) {
+                    if (updateBlacklist.stream().noneMatch { key.contains(it) }) {
                         this.handle.set(key, newConfig[key])
                     }
                 }
@@ -67,7 +67,7 @@ class EcoUpdatableYamlConfig(
         }
 
     init {
-        this.updateBlacklist.removeIf { obj: String -> obj.isEmpty() }
+        this.updateBlacklist.removeIf { it.isEmpty() }
         plugin.configHandler.addConfig(this)
         update()
     }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.kt

@@ -2,15 +2,15 @@ package com.willfp.eco.internal.config.yaml
 
 import com.willfp.eco.core.config.interfaces.Config
 import com.willfp.eco.util.StringUtils
-import org.apache.commons.lang.Validate
 import org.bukkit.configuration.ConfigurationSection
 import org.bukkit.configuration.file.YamlConfiguration
 import java.io.StringReader
+import java.util.concurrent.ConcurrentHashMap
 
 @Suppress("UNCHECKED_CAST")
 open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
     lateinit var handle: T
-    private val cache = mutableMapOf<String, Any?>()
+    private val cache = ConcurrentHashMap<String, Any?>()
 
     protected fun init(config: T): Config {
         handle = config
@@ -51,8 +51,7 @@ open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
 
     override fun getSubsection(path: String): Config {
         val subsection = getSubsectionOrNull(path)
-        Validate.notNull(subsection)
-        return subsection!!
+        return subsection ?: EcoYamlConfigSection(YamlConfiguration())
     }
 
     override fun getSubsectionOrNull(path: String): Config? {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/data/EcoPlayerProfile.kt

@@ -0,0 +1,17 @@
+package com.willfp.eco.internal.data
+
+import com.willfp.eco.core.data.PlayerProfile
+import com.willfp.eco.core.data.keys.PersistentDataKey
+
+class EcoPlayerProfile(
+    val data: MutableMap<PersistentDataKey<*>, Any>
+) : PlayerProfile {
+    override fun <T : Any> write(key: PersistentDataKey<T>, value: T) {
+        this.data[key] = value
+    }
+
+    override fun <T : Any> read(key: PersistentDataKey<T>): T {
+        @Suppress("UNCHECKED_CAST")
+        return this.data[key] as T? ?: key.defaultValue
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/display/EcoDisplayHandler.kt

@@ -0,0 +1,115 @@
+package com.willfp.eco.internal.display
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.display.Display
+import com.willfp.eco.core.display.DisplayHandler
+import com.willfp.eco.core.display.DisplayModule
+import com.willfp.eco.core.display.DisplayPriority
+import com.willfp.eco.core.fast.FastItemStack
+import org.bukkit.NamespacedKey
+import org.bukkit.entity.Player
+import org.bukkit.inventory.ItemStack
+import org.bukkit.persistence.PersistentDataType
+import java.util.concurrent.ExecutorService
+import java.util.concurrent.Executors
+
+class EcoDisplayHandler(plugin: EcoPlugin) : DisplayHandler {
+    private val registeredModules = mutableMapOf<DisplayPriority, MutableList<DisplayModule>>()
+    private val finalizeKey: NamespacedKey = plugin.namespacedKeyFactory.create("finalized")
+
+    init {
+        for (priority in DisplayPriority.values()) {
+            registeredModules[priority] = mutableListOf()
+        }
+    }
+
+    override fun registerDisplayModule(module: DisplayModule) {
+        val modules = registeredModules[module.priority] ?: return
+        modules.removeIf { module1: DisplayModule ->
+            module1.pluginName.equals(module.pluginName, ignoreCase = true)
+        }
+        modules.add(module)
+        registeredModules[module.priority] = modules
+    }
+
+    override fun display(itemStack: ItemStack, player: Player?): ItemStack {
+        val pluginVarArgs = mutableMapOf<String, Array<Any>>()
+
+        for (priority in DisplayPriority.values()) {
+            val modules = registeredModules[priority] ?: continue
+            for (module in modules) {
+                pluginVarArgs[module.pluginName] = module.generateVarArgs(itemStack)
+            }
+        }
+
+        Display.revert(itemStack)
+
+        itemStack.itemMeta ?: return itemStack
+
+        for (priority in DisplayPriority.values()) {
+            val modules = registeredModules[priority] ?: continue
+            for (module in modules) {
+                val varargs = pluginVarArgs[module.pluginName] ?: continue
+                Display.callDisplayModule(module, itemStack, player, *varargs)
+            }
+        }
+
+        return itemStack
+    }
+
+    override fun revert(itemStack: ItemStack): ItemStack {
+        if (Display.isFinalized(itemStack)) {
+            Display.unfinalize(itemStack)
+        }
+
+        val fast = FastItemStack.wrap(itemStack)
+        val lore = fast.lore
+
+        if (lore.isNotEmpty() && lore.removeIf { line: String ->
+                line.startsWith(
+                    Display.PREFIX
+                )
+            }) { // Only modify lore if needed.
+            fast.lore = lore
+        }
+
+        for (priority in DisplayPriority.values()) {
+            val modules = registeredModules[priority] ?: continue
+            for (module in modules) {
+                module.revert(itemStack)
+            }
+        }
+
+        return itemStack
+    }
+
+    override fun finalize(itemStack: ItemStack): ItemStack {
+        if (itemStack.type.maxStackSize > 1) {
+            return itemStack
+        }
+
+        val meta = itemStack.itemMeta ?: return itemStack
+
+        val container = meta.persistentDataContainer
+        container.set(finalizeKey, PersistentDataType.INTEGER, 1)
+        itemStack.itemMeta = meta
+        return itemStack
+    }
+
+    override fun unfinalize(itemStack: ItemStack): ItemStack {
+        val meta = itemStack.itemMeta ?: return itemStack
+
+        val container = meta.persistentDataContainer
+        container.remove(finalizeKey)
+        itemStack.itemMeta = meta
+        return itemStack
+    }
+
+    override fun isFinalized(itemStack: ItemStack): Boolean {
+        val meta = itemStack.itemMeta ?: return false
+
+        val container = meta.persistentDataContainer
+        return container.has(finalizeKey, PersistentDataType.INTEGER)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/drops/impl/EcoDropQueue.kt

@@ -12,10 +12,9 @@ import org.bukkit.event.player.PlayerExpChangeEvent
 import org.bukkit.inventory.ItemStack
 import org.bukkit.util.Vector
 
-open class EcoDropQueue(player: Player) : InternalDropQueue {
+open class EcoDropQueue(val player: Player) : InternalDropQueue {
     val items = mutableListOf<ItemStack>()
     var xp: Int = 0
-    val player: Player
     var loc: Location
     var hasTelekinesis = false
 
@@ -79,7 +78,6 @@ open class EcoDropQueue(player: Player) : InternalDropQueue {
     }
 
     init {
-        this.player = player
         loc = player.location
     }
 }

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

@@ -22,11 +22,11 @@ class EcoMenu(
 ): Menu {
     override fun getSlot(row: Int, column: Int): Slot {
         if (row < 1 || row > this.rows) {
-            throw IllegalArgumentException("Invalid row number!")
+            return slots[0][0]
         }
 
         if (column < 1 || column > 9) {
-            throw IllegalArgumentException("Invalid column number!")
+            return slots[0][0]
         }
 
         return slots[row - 1][column - 1]

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

@@ -18,9 +18,7 @@ class ExtendedInventory(
     fun refresh(player: Player) {
         captiveItems.clear()
         for (i in 0 until inventory.size) {
-            val pair = MenuUtils.convertSlotToRowColumn(i)
-            val row = pair.first!!
-            val column = pair.second!!
+            val (row, column) = MenuUtils.convertSlotToRowColumn(i)
             val slot = menu.getSlot(row, column)
             if (slot is EcoCaptivatorSlot) {
                 val defaultItem = slot.getItemStack(player)

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

@@ -2,10 +2,11 @@ package com.willfp.eco.internal.gui.menu
 
 import com.willfp.eco.core.gui.menu.Menu
 import org.bukkit.inventory.Inventory
+import java.util.*
 
 object MenuHandler {
-    private val menus = mutableMapOf<ExtendedInventory, EcoMenu>()
-    private val inventories = mutableMapOf<Inventory, ExtendedInventory>()
+    private val menus = WeakHashMap<ExtendedInventory, EcoMenu>()
+    private val inventories = WeakHashMap<Inventory, ExtendedInventory>()
 
     fun registerMenu(
         inventory: Inventory,

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/requirement/EcoRequirementFactory.kt

@@ -0,0 +1,17 @@
+package com.willfp.eco.internal.requirement
+
+import com.willfp.eco.core.requirement.Requirement
+import com.willfp.eco.core.requirement.RequirementFactory
+import com.willfp.eco.internal.requirement.requirements.*
+
+class EcoRequirementFactory: RequirementFactory {
+    override fun create(name: String): Requirement {
+        return when (name.lowercase()) {
+            "has-permission" -> RequirementHasPermission()
+            "placeholder-equals" -> RequirementPlaceholderEquals()
+            "placeholder-greater-than" -> RequirementPlaceholderGreaterThan()
+            "placeholder-less-than" -> RequirementPlaceholderLessThan()
+            else -> RequirementTrue()
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/requirement/requirements/RequirementHasPermission.kt

@@ -0,0 +1,18 @@
+package com.willfp.eco.internal.requirement.requirements
+
+import com.willfp.eco.core.requirement.Requirement
+import org.bukkit.entity.Player
+
+class RequirementHasPermission : Requirement() {
+    override fun doesPlayerMeet(
+        player: Player,
+        args: List<String>
+    ): Boolean {
+        if (args.isEmpty()) {
+            return false
+        }
+
+        val permission = args[0]
+        return player.hasPermission(permission)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/requirement/requirements/RequirementPlaceholderEquals.kt

@@ -0,0 +1,20 @@
+package com.willfp.eco.internal.requirement.requirements
+
+import com.willfp.eco.core.integrations.placeholder.PlaceholderManager
+import com.willfp.eco.core.requirement.Requirement
+import org.bukkit.entity.Player
+
+class RequirementPlaceholderEquals : Requirement() {
+    override fun doesPlayerMeet(
+        player: Player,
+        args: List<String>
+    ): Boolean {
+        if (args.size < 2) {
+            return false
+        }
+
+        val placeholder = args[0]
+        val equals = args[1]
+        return PlaceholderManager.translatePlaceholders(placeholder, player).equals(equals, ignoreCase = true)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/requirement/requirements/RequirementPlaceholderGreaterThan.kt

@@ -0,0 +1,20 @@
+package com.willfp.eco.internal.requirement.requirements
+
+import com.willfp.eco.core.integrations.placeholder.PlaceholderManager
+import com.willfp.eco.core.requirement.Requirement
+import org.bukkit.entity.Player
+
+class RequirementPlaceholderGreaterThan : Requirement() {
+    override fun doesPlayerMeet(
+        player: Player,
+        args: List<String>
+    ): Boolean {
+        if (args.size < 2) {
+            return false
+        }
+
+        val placeholder = args[0]
+        val equals = args[1].toDoubleOrNull() ?: return false
+        return PlaceholderManager.translatePlaceholders(placeholder, player).toDoubleOrNull() ?: 0.0 >= equals
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/requirement/requirements/RequirementPlaceholderLessThan.kt

@@ -0,0 +1,20 @@
+package com.willfp.eco.internal.requirement.requirements
+
+import com.willfp.eco.core.integrations.placeholder.PlaceholderManager
+import com.willfp.eco.core.requirement.Requirement
+import org.bukkit.entity.Player
+
+class RequirementPlaceholderLessThan : Requirement() {
+    override fun doesPlayerMeet(
+        player: Player,
+        args: List<String>
+    ): Boolean {
+        if (args.size < 2) {
+            return false
+        }
+
+        val placeholder = args[0]
+        val equals = args[1].toDoubleOrNull() ?: return false
+        return PlaceholderManager.translatePlaceholders(placeholder, player).toDoubleOrNull() ?: 0.0 < equals
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/requirement/requirements/RequirementTrue.kt

@@ -0,0 +1,13 @@
+package com.willfp.eco.internal.requirement.requirements
+
+import com.willfp.eco.core.requirement.Requirement
+import org.bukkit.entity.Player
+
+class RequirementTrue : Requirement() {
+    override fun doesPlayerMeet(
+        player: Player,
+        args: List<String>
+    ): Boolean {
+        return true
+    }
+}

eco-core/core-nms/v1_16_R3/build.gradle

@@ -3,4 +3,6 @@ version rootProject.version
 
 dependencies {
     compileOnly 'org.spigotmc:spigot:1.16.5-R0.1-SNAPSHOT'
+    compileOnly 'net.kyori:adventure-api:4.9.1'
+    compileOnly 'net.kyori:adventure-text-serializer-gson:4.8.1'
 }

eco-core/core-nms/v1_16_R3/src/main/java/com/willfp/eco/proxy/v1_16_R3/ChatComponent.java

@@ -1,118 +0,0 @@
-package com.willfp.eco.proxy.v1_16_R3;
-
-import com.google.gson.JsonElement;
-import com.google.gson.JsonObject;
-import com.google.gson.JsonPrimitive;
-import com.mojang.brigadier.exceptions.CommandSyntaxException;
-import com.willfp.eco.core.display.Display;
-import com.willfp.eco.proxy.ChatComponentProxy;
-import net.minecraft.server.v1_16_R3.ChatBaseComponent;
-import net.minecraft.server.v1_16_R3.ChatHoverable;
-import net.minecraft.server.v1_16_R3.ChatMessage;
-import net.minecraft.server.v1_16_R3.ChatModifier;
-import net.minecraft.server.v1_16_R3.IChatBaseComponent;
-import net.minecraft.server.v1_16_R3.MojangsonParser;
-import org.bukkit.Material;
-import org.bukkit.craftbukkit.v1_16_R3.inventory.CraftItemStack;
-import org.bukkit.entity.Player;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.Arrays;
-
-public final class ChatComponent implements ChatComponentProxy {
-    @Override
-    public Object modifyComponent(@NotNull final Object obj,
-                                  @NotNull final Player player) {
-        if (!(obj instanceof IChatBaseComponent chatComponent)) {
-            return obj;
-        }
-
-        for (IChatBaseComponent iChatBaseComponent : chatComponent) {
-            if (iChatBaseComponent == null) {
-                continue;
-            }
-
-            modifyBaseComponent(iChatBaseComponent, player);
-        }
-
-        return chatComponent;
-    }
-
-    private void modifyBaseComponent(@NotNull final IChatBaseComponent component,
-                                     @NotNull final Player player) {
-        for (IChatBaseComponent sibling : component.getSiblings()) {
-            if (sibling == null) {
-                continue;
-            }
-
-            modifyBaseComponent(sibling, player);
-        }
-        if (component instanceof ChatMessage) {
-            Arrays.stream(((ChatMessage) component).getArgs())
-                    .filter(o -> o instanceof IChatBaseComponent)
-                    .map(o -> (IChatBaseComponent) o)
-                    .forEach(o -> this.modifyBaseComponent(o, player));
-        }
-
-        ChatHoverable hoverable = component.getChatModifier().getHoverEvent();
-
-        if (hoverable == null) {
-            return;
-        }
-
-        JsonObject jsonObject = hoverable.b();
-        JsonElement json = hoverable.b().get("contents");
-        if (json.getAsJsonObject().get("id") == null) {
-            return;
-        }
-        if (json.getAsJsonObject().get("tag") == null) {
-            return;
-        }
-        String id = json.getAsJsonObject().get("id").toString();
-        String tag = json.getAsJsonObject().get("tag").toString();
-        ItemStack itemStack = getFromTag(tag, id);
-
-        Display.displayAndFinalize(itemStack, player);
-
-        json.getAsJsonObject().remove("tag");
-        String newTag = toJson(itemStack);
-        json.getAsJsonObject().add("tag", new JsonPrimitive(newTag));
-
-        jsonObject.remove("contents");
-        jsonObject.add("contents", json);
-        ChatHoverable newHoverable = ChatHoverable.a(jsonObject);
-        ChatModifier modifier = component.getChatModifier();
-        modifier = modifier.setChatHoverable(newHoverable);
-
-        ((ChatBaseComponent) component).setChatModifier(modifier);
-    }
-
-    private static ItemStack getFromTag(@NotNull final String jsonTag,
-                                        @NotNull final String id) {
-        String processedId = id;
-        String processedJsonTag = jsonTag;
-        processedId = processedId.replace("minecraft:", "");
-        processedId = processedId.toUpperCase();
-        processedId = processedId.replace("\"", "");
-        processedJsonTag = processedJsonTag.substring(1, processedJsonTag.length() - 1);
-        processedJsonTag = processedJsonTag.replace("id:", "\"id\":");
-        processedJsonTag = processedJsonTag.replace("\\", "");
-        Material material = Material.getMaterial(processedId);
-
-        assert material != null;
-        ItemStack itemStack = new ItemStack(material);
-        net.minecraft.server.v1_16_R3.ItemStack nmsStack = CraftItemStack.asNMSCopy(itemStack);
-
-        try {
-            nmsStack.setTag(MojangsonParser.parse(processedJsonTag));
-        } catch (CommandSyntaxException e) {
-            e.printStackTrace();
-        }
-        return CraftItemStack.asBukkitCopy(nmsStack);
-    }
-
-    private static String toJson(@NotNull final ItemStack itemStack) {
-        return CraftItemStack.asNMSCopy(itemStack).getOrCreateTag().toString();
-    }
-}

eco-core/core-nms/v1_16_R3/src/main/java/com/willfp/eco/proxy/v1_16_R3/FastItemStackUtils.java

@@ -1,43 +0,0 @@
-package com.willfp.eco.proxy.v1_16_R3;
-
-import org.bukkit.craftbukkit.libs.org.apache.commons.lang3.Validate;
-import org.bukkit.craftbukkit.v1_16_R3.inventory.CraftItemStack;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-
-import java.lang.reflect.Field;
-
-public class FastItemStackUtils {
-    private static final Field FIELD;
-
-    public static net.minecraft.server.v1_16_R3.ItemStack getNMSStack(@NotNull final ItemStack itemStack) {
-        if (!(itemStack instanceof CraftItemStack)) {
-            return CraftItemStack.asNMSCopy(itemStack);
-        } else {
-            try {
-                net.minecraft.server.v1_16_R3.ItemStack nms = (net.minecraft.server.v1_16_R3.ItemStack) FIELD.get(itemStack);
-                return nms == null ? CraftItemStack.asNMSCopy(itemStack) : nms;
-            } catch (ReflectiveOperationException e) {
-                e.printStackTrace();
-                return net.minecraft.server.v1_16_R3.ItemStack.b;
-            }
-        }
-    }
-
-    static {
-        Field temp = null;
-
-        try {
-            Field handleField = CraftItemStack.class.getDeclaredField("handle");
-            handleField.setAccessible(true);
-            temp = handleField;
-        } catch (ReflectiveOperationException e) {
-            e.printStackTrace();
-        }
-
-        assert temp != null;
-        Validate.notNull(temp, "Error occurred in initialization!");
-
-        FIELD = temp;
-    }
-}

eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/ChatComponent.kt

@@ -0,0 +1,93 @@
+package com.willfp.eco.proxy.v1_16_R3
+
+import com.willfp.eco.core.display.Display
+import com.willfp.eco.proxy.ChatComponentProxy
+import net.kyori.adventure.nbt.api.BinaryTagHolder
+import net.kyori.adventure.text.BuildableComponent
+import net.kyori.adventure.text.Component
+import net.kyori.adventure.text.TranslatableComponent
+import net.kyori.adventure.text.event.HoverEvent
+import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer
+import net.minecraft.server.v1_16_R3.IChatBaseComponent
+import net.minecraft.server.v1_16_R3.MojangsonParser
+import org.bukkit.Material
+import org.bukkit.craftbukkit.v1_16_R3.inventory.CraftItemStack
+import org.bukkit.entity.Player
+
+@Suppress("UNCHECKED_CAST")
+class ChatComponent : ChatComponentProxy {
+    private val gsonComponentSerializer = GsonComponentSerializer.gson()
+
+    override fun modifyComponent(obj: Any, player: Player): Any {
+        if (obj !is IChatBaseComponent) {
+            return obj
+        }
+
+        val component = gsonComponentSerializer.deserialize(
+            IChatBaseComponent.ChatSerializer.a(
+                obj
+            )
+        ).asComponent() as BuildableComponent<*, *>
+
+        val newComponent = modifyBaseComponent(component, player)
+
+        return IChatBaseComponent.ChatSerializer.a(
+            gsonComponentSerializer.serialize(newComponent.asComponent())
+        ) ?: obj
+    }
+
+    private fun modifyBaseComponent(baseComponent: Component, player: Player): Component {
+        var component = baseComponent
+
+        if (component is TranslatableComponent) {
+            val args = mutableListOf<Component>()
+            for (arg in component.args()) {
+                args.add(modifyBaseComponent(arg, player))
+            }
+            component = component.args(args)
+        }
+
+        val children = mutableListOf<Component>()
+        for (child in component.children()) {
+            children.add(modifyBaseComponent(child, player))
+        }
+        component = component.children(children)
+
+        val hoverEvent: HoverEvent<Any> = component.style().hoverEvent() as HoverEvent<Any>? ?: return component
+
+        val showItem = hoverEvent.value()
+
+        if (showItem !is HoverEvent.ShowItem) {
+            return component
+        }
+
+        val newShowItem = showItem.nbt(
+            BinaryTagHolder.of(
+                CraftItemStack.asNMSCopy(
+                    Display.display(
+                        CraftItemStack.asBukkitCopy(
+                            CraftItemStack.asNMSCopy(
+                                org.bukkit.inventory.ItemStack(
+                                    Material.matchMaterial(
+                                        showItem.item()
+                                            .toString()
+                                    ) ?: return component,
+                                    showItem.count()
+                                )
+                            ).apply {
+                                this.tag = MojangsonParser.parse(
+                                    showItem.nbt()?.string() ?: return component
+                                ) ?: return component
+                            }
+                        ),
+                        player
+                    )
+                ).orCreateTag.toString()
+            )
+        )
+
+        val newHover = hoverEvent.value(newShowItem)
+        val style = component.style().hoverEvent(newHover)
+        return component.style(style)
+    }
+}

eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/Skull.kt

@@ -36,8 +36,9 @@ class Skull : SkullProxy {
             profile = meta.javaClass.getDeclaredField("profile")
             profile.isAccessible = true
         }
-        val profile = profile[meta] as GameProfile?
-        val property = profile?.properties?.get("textures") as Property?
-        return property?.value
+        val profile = profile[meta] as GameProfile? ?: return null
+        val properties = profile.properties ?: return null
+        val prop = properties["textures"] ?: return null
+        return prop.toMutableList().firstOrNull()?.name
     }
 }

eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/TPS.kt

@@ -0,0 +1,11 @@
+package com.willfp.eco.proxy.v1_16_R3
+
+import com.willfp.eco.proxy.TPSProxy
+import org.bukkit.Bukkit
+import org.bukkit.craftbukkit.v1_16_R3.CraftServer
+
+class TPS : TPSProxy {
+    override fun getTPS(): Double {
+        return (Bukkit.getServer() as CraftServer).handle.server.recentTps[0]
+    }
+}

eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/fast/FastItemStackUtils.kt

@@ -0,0 +1,17 @@
+package com.willfp.eco.proxy.v1_16_R3.fast
+
+import org.bukkit.craftbukkit.v1_16_R3.inventory.CraftItemStack
+import org.bukkit.inventory.ItemStack
+import java.lang.reflect.Field
+
+private val field: Field = CraftItemStack::class.java.getDeclaredField("handle").apply {
+    isAccessible = true
+}
+
+fun ItemStack.getNMSStack(): net.minecraft.server.v1_16_R3.ItemStack {
+    return if (this !is CraftItemStack) {
+        CraftItemStack.asNMSCopy(this)
+    } else {
+        field[this] as net.minecraft.server.v1_16_R3.ItemStack? ?: CraftItemStack.asNMSCopy(this)
+    }
+}

eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/fast/NMSFastItemStack.kt

@@ -1,7 +1,6 @@
 package com.willfp.eco.proxy.v1_16_R3.fast
 
 import com.willfp.eco.internal.fast.EcoFastItemStack
-import com.willfp.eco.proxy.v1_16_R3.FastItemStackUtils
 import com.willfp.eco.util.StringUtils
 import net.minecraft.server.v1_16_R3.*
 import org.bukkit.craftbukkit.v1_16_R3.inventory.CraftItemStack
@@ -12,7 +11,7 @@ import org.bukkit.inventory.ItemFlag
 import kotlin.experimental.and
 
 class NMSFastItemStack(itemStack: org.bukkit.inventory.ItemStack) : EcoFastItemStack<ItemStack>(
-    FastItemStackUtils.getNMSStack(itemStack), itemStack
+    itemStack.getNMSStack(), itemStack
 ) {
     private var loreCache: List<String>? = null
     override fun getEnchantmentsOnItem(checkStored: Boolean): Map<Enchantment, Int> {
@@ -151,6 +150,18 @@ class NMSFastItemStack(itemStack: org.bukkit.inventory.ItemStack) : EcoFastItemS
         handle.repairCost = cost
     }
 
+    override fun equals(other: Any?): Boolean {
+        if (other !is NMSFastItemStack) {
+            return false
+        }
+
+        return other.hashCode() == this.hashCode()
+    }
+
+    override fun hashCode(): Int {
+        return handle.tag.hashCode() * 31 + Item.getId(handle.item)
+    }
+
     private fun apply() {
         if (bukkit !is CraftItemStack) {
             bukkit.itemMeta = CraftItemStack.asCraftMirror(handle).itemMeta

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

@@ -7,6 +7,8 @@ version rootProject.version
 
 dependencies {
     compileOnly 'org.spigotmc:spigot:1.17.1-R0.1-SNAPSHOT:remapped-mojang'
+    compileOnly 'net.kyori:adventure-api:4.9.1'
+    compileOnly 'net.kyori:adventure-text-serializer-gson:4.8.1'
 }
 
 specialGradle {

eco-core/core-nms/v1_17_R1/src/main/java/com/willfp/eco/proxy/v1_17_R1/ChatComponent.java

@@ -1,118 +0,0 @@
-package com.willfp.eco.proxy.v1_17_R1;
-
-import com.google.gson.JsonElement;
-import com.google.gson.JsonObject;
-import com.google.gson.JsonPrimitive;
-import com.mojang.brigadier.exceptions.CommandSyntaxException;
-import com.willfp.eco.core.display.Display;
-import net.minecraft.nbt.TagParser;
-import net.minecraft.network.chat.BaseComponent;
-import net.minecraft.network.chat.Component;
-import net.minecraft.network.chat.HoverEvent;
-import net.minecraft.network.chat.Style;
-import net.minecraft.network.chat.TranslatableComponent;
-import org.bukkit.Material;
-import org.bukkit.craftbukkit.v1_17_R1.inventory.CraftItemStack;
-import org.bukkit.entity.Player;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-import com.willfp.eco.proxy.ChatComponentProxy;
-
-public final class ChatComponent implements ChatComponentProxy {
-    @Override
-    public Object modifyComponent(@NotNull final Object obj,
-                                  @NotNull final Player player) {
-        if (!(obj instanceof Component chatComponent)) {
-            return obj;
-        }
-
-        for (Component iChatBaseComponent : chatComponent) {
-            if (iChatBaseComponent == null) {
-                continue;
-            }
-
-            modifyBaseComponent(iChatBaseComponent, player);
-        }
-
-        return chatComponent;
-    }
-
-    private void modifyBaseComponent(@NotNull final Component component,
-                                     @NotNull final Player player) {
-        for (Component sibling : component.getSiblings()) {
-            if (sibling == null) {
-                continue;
-            }
-
-            modifyBaseComponent(sibling, player);
-        }
-
-        if (component instanceof TranslatableComponent baseComponent) {
-            for (Object arg : baseComponent.getArgs()) {
-                if (arg instanceof Component) {
-                    modifyBaseComponent((Component) arg, player);
-                }
-            }
-        }
-
-        HoverEvent hoverable = component.getStyle().getHoverEvent();
-
-        if (hoverable == null) {
-            return;
-        }
-
-        JsonObject jsonObject = hoverable.serialize();
-        JsonElement json = jsonObject.get("contents");
-        if (json.getAsJsonObject().get("id") == null) {
-            return;
-        }
-        if (json.getAsJsonObject().get("tag") == null) {
-            return;
-        }
-        String id = json.getAsJsonObject().get("id").toString();
-        String tag = json.getAsJsonObject().get("tag").toString();
-        ItemStack itemStack = getFromTag(tag, id);
-
-        Display.displayAndFinalize(itemStack, player);
-
-        json.getAsJsonObject().remove("tag");
-        String newTag = toJson(itemStack);
-        json.getAsJsonObject().add("tag", new JsonPrimitive(newTag));
-
-        jsonObject.remove("contents");
-        jsonObject.add("contents", json);
-        HoverEvent newHoverable = HoverEvent.deserialize(jsonObject);
-        Style modifier = component.getStyle();
-        modifier = modifier.withHoverEvent(newHoverable);
-
-        ((BaseComponent) component).setStyle(modifier);
-    }
-
-    private static ItemStack getFromTag(@NotNull final String jsonTag,
-                                        @NotNull final String id) {
-        String processedId = id;
-        String processedJsonTag = jsonTag;
-        processedId = processedId.replace("minecraft:", "");
-        processedId = processedId.toUpperCase();
-        processedId = processedId.replace("\"", "");
-        processedJsonTag = processedJsonTag.substring(1, processedJsonTag.length() - 1);
-        processedJsonTag = processedJsonTag.replace("id:", "\"id\":");
-        processedJsonTag = processedJsonTag.replace("\\", "");
-        Material material = Material.getMaterial(processedId);
-
-        assert material != null;
-        ItemStack itemStack = new ItemStack(material);
-        net.minecraft.world.item.ItemStack nmsStack = CraftItemStack.asNMSCopy(itemStack);
-
-        try {
-            nmsStack.setTag(TagParser.parseTag(processedJsonTag));
-        } catch (CommandSyntaxException e) {
-            e.printStackTrace();
-        }
-        return CraftItemStack.asBukkitCopy(nmsStack);
-    }
-
-    private static String toJson(@NotNull final ItemStack itemStack) {
-        return CraftItemStack.asNMSCopy(itemStack).getOrCreateTag().toString();
-    }
-}

eco-core/core-nms/v1_17_R1/src/main/java/com/willfp/eco/proxy/v1_17_R1/FastItemStackUtils.java

@@ -1,45 +0,0 @@
-package com.willfp.eco.proxy.v1_17_R1;
-
-import lombok.experimental.UtilityClass;
-import org.bukkit.craftbukkit.libs.org.apache.commons.lang3.Validate;
-import org.bukkit.craftbukkit.v1_17_R1.inventory.CraftItemStack;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-
-import java.lang.reflect.Field;
-
-@UtilityClass
-public class FastItemStackUtils {
-    private static final Field FIELD;
-
-    public static net.minecraft.world.item.ItemStack getNMSStack(@NotNull final ItemStack itemStack) {
-        if (!(itemStack instanceof CraftItemStack)) {
-            return CraftItemStack.asNMSCopy(itemStack);
-        } else {
-            try {
-                net.minecraft.world.item.ItemStack nms = (net.minecraft.world.item.ItemStack) FIELD.get(itemStack);
-                return nms == null ? CraftItemStack.asNMSCopy(itemStack) : nms;
-            } catch (ReflectiveOperationException e) {
-                e.printStackTrace();
-                return net.minecraft.world.item.ItemStack.EMPTY;
-            }
-        }
-    }
-
-    static {
-        Field temp = null;
-
-        try {
-            Field handleField = CraftItemStack.class.getDeclaredField("handle");
-            handleField.setAccessible(true);
-            temp = handleField;
-        } catch (ReflectiveOperationException e) {
-            e.printStackTrace();
-        }
-
-        assert temp != null;
-        Validate.notNull(temp, "Error occurred in initialization!");
-
-        FIELD = temp;
-    }
-}

eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/ChatComponent.kt

@@ -0,0 +1,93 @@
+package com.willfp.eco.proxy.v1_17_R1
+
+import com.willfp.eco.core.display.Display
+import com.willfp.eco.proxy.ChatComponentProxy
+import net.kyori.adventure.nbt.api.BinaryTagHolder
+import net.kyori.adventure.text.BuildableComponent
+import net.kyori.adventure.text.Component
+import net.kyori.adventure.text.TranslatableComponent
+import net.kyori.adventure.text.event.HoverEvent
+import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer
+import net.minecraft.nbt.TagParser
+import org.bukkit.Material
+import org.bukkit.craftbukkit.v1_17_R1.inventory.CraftItemStack
+import org.bukkit.entity.Player
+import org.bukkit.inventory.ItemStack
+
+@Suppress("UNCHECKED_CAST")
+class ChatComponent : ChatComponentProxy {
+    private val gsonComponentSerializer = GsonComponentSerializer.gson()
+
+    override fun modifyComponent(obj: Any, player: Player): Any {
+        if (obj !is net.minecraft.network.chat.Component) {
+            return obj
+        }
+
+        val component = gsonComponentSerializer.deserialize(
+            net.minecraft.network.chat.Component.Serializer.toJson(
+                obj
+            )
+        ).asComponent() as BuildableComponent<*, *>
+
+        val newComponent = modifyBaseComponent(component, player)
+
+        return net.minecraft.network.chat.Component.Serializer.fromJson(
+            gsonComponentSerializer.serialize(newComponent.asComponent())
+        ) ?: obj
+    }
+
+    private fun modifyBaseComponent(baseComponent: Component, player: Player): Component {
+        var component = baseComponent
+
+        if (component is TranslatableComponent) {
+            val args = mutableListOf<Component>()
+            for (arg in component.args()) {
+                args.add(modifyBaseComponent(arg, player))
+            }
+            component = component.args(args)
+        }
+
+        val children = mutableListOf<Component>()
+        for (child in component.children()) {
+            children.add(modifyBaseComponent(child, player))
+        }
+        component = component.children(children)
+
+        val hoverEvent: HoverEvent<Any> = component.style().hoverEvent() as HoverEvent<Any>? ?: return component
+
+        val showItem = hoverEvent.value()
+
+        if (showItem !is HoverEvent.ShowItem) {
+            return component
+        }
+
+        val newShowItem = showItem.nbt(
+            BinaryTagHolder.of(
+                CraftItemStack.asNMSCopy(
+                    Display.display(
+                        CraftItemStack.asBukkitCopy(
+                            CraftItemStack.asNMSCopy(
+                                ItemStack(
+                                    Material.matchMaterial(
+                                        showItem.item()
+                                            .toString()
+                                    ) ?: return component,
+                                    showItem.count()
+                                )
+                            ).apply {
+                                this.tag = TagParser.parseTag(
+                                    showItem.nbt()?.string() ?: return component
+                                ) ?: return component
+                            }
+                        ),
+                        player
+                    )
+                ).orCreateTag.toString()
+            )
+        )
+
+        val newHover = hoverEvent.value(newShowItem)
+        val style = component.style().hoverEvent(newHover)
+        return component.style(style)
+    }
+}

eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/Skull.kt

@@ -36,8 +36,9 @@ class Skull : SkullProxy {
             profile = meta.javaClass.getDeclaredField("profile")
             profile.isAccessible = true
         }
-        val profile = profile[meta] as GameProfile?
-        val property = profile?.properties?.get("textures") as Property?
-        return property?.value
+        val profile = profile[meta] as GameProfile? ?: return null
+        val properties = profile.properties ?: return null
+        val prop = properties["textures"] ?: return null
+        return prop.toMutableList().firstOrNull()?.name
     }
 }

eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/TPS.kt

@@ -0,0 +1,11 @@
+package com.willfp.eco.proxy.v1_17_R1
+
+import com.willfp.eco.proxy.TPSProxy
+import org.bukkit.Bukkit
+import org.bukkit.craftbukkit.v1_17_R1.CraftServer
+
+class TPS : TPSProxy {
+    override fun getTPS(): Double {
+        return (Bukkit.getServer() as CraftServer).handle.server.recentTps[0]
+    }
+}

eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/fast/FastItemStackUtils.kt

@@ -0,0 +1,17 @@
+package com.willfp.eco.proxy.v1_17_R1.fast
+
+import org.bukkit.craftbukkit.v1_17_R1.inventory.CraftItemStack
+import org.bukkit.inventory.ItemStack
+import java.lang.reflect.Field
+
+private val field: Field = CraftItemStack::class.java.getDeclaredField("handle").apply {
+    isAccessible = true
+}
+
+fun ItemStack.getNMSStack(): net.minecraft.world.item.ItemStack {
+    return if (this !is CraftItemStack) {
+        CraftItemStack.asNMSCopy(this)
+    } else {
+        field[this] as net.minecraft.world.item.ItemStack? ?: CraftItemStack.asNMSCopy(this)
+    }
+}

eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/fast/NMSFastItemStack.kt

@@ -1,12 +1,12 @@
 package com.willfp.eco.proxy.v1_17_R1.fast
 
 import com.willfp.eco.internal.fast.EcoFastItemStack
-import com.willfp.eco.proxy.v1_17_R1.FastItemStackUtils
 import com.willfp.eco.util.StringUtils
 import net.minecraft.nbt.CompoundTag
 import net.minecraft.nbt.ListTag
 import net.minecraft.nbt.StringTag
 import net.minecraft.world.item.EnchantedBookItem
+import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.Items
 import org.bukkit.craftbukkit.v1_17_R1.inventory.CraftItemStack
@@ -17,7 +17,7 @@ import org.bukkit.inventory.ItemFlag
 import kotlin.experimental.and
 
 class NMSFastItemStack(itemStack: org.bukkit.inventory.ItemStack) : EcoFastItemStack<ItemStack>(
-    FastItemStackUtils.getNMSStack(itemStack), itemStack
+    itemStack.getNMSStack(), itemStack
 ) {
     private var loreCache: List<String>? = null
 
@@ -171,6 +171,18 @@ class NMSFastItemStack(itemStack: org.bukkit.inventory.ItemStack) : EcoFastItemS
         handle.setRepairCost(cost)
     }
 
+    override fun equals(other: Any?): Boolean {
+        if (other !is NMSFastItemStack) {
+            return false
+        }
+
+        return other.hashCode() == this.hashCode()
+    }
+
+    override fun hashCode(): Int {
+        return handle.tag.hashCode() * 31 + Item.getId(handle.item)
+    }
+
     private fun apply() {
         if (bukkit !is CraftItemStack) {
             bukkit.itemMeta = CraftItemStack.asCraftMirror(handle).itemMeta