Initial commit

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/ChangeSession.java

@@ -0,0 +1,86 @@
+package dev.lone.vanillacustomizer;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.LoneLibs.annotations.Nullable;
+import dev.lone.vanillacustomizer.customization.rules.RuleVanillaItemMatcher;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+
+// TODO: find a better name for this
+public class ChangeSession
+{
+    public final ItemStack item;
+    public final ItemStack originalItem;
+
+    public ItemMeta meta;
+
+    public NBTItem nbt;
+
+    public final boolean isVanilla;
+
+    @Nullable
+    private Boolean hasChanged_cached;
+
+    public ChangeSession(ItemStack item, boolean trackChanges)
+    {
+        this.item = item;
+        if(trackChanges)
+            this.originalItem = item.clone();
+        else
+            this.originalItem = null;
+
+        isVanilla = RuleVanillaItemMatcher.satisfy(item);
+    }
+
+    public ItemMeta refreshMeta()
+    {
+        // Meta always needs to be refreshed as Spigot caches it!
+        meta = item.getItemMeta();
+        return meta;
+    }
+
+    private void refreshNbt()
+    {
+        nbt = new NBTItem(item);
+    }
+
+    public NBTItem nbt()
+    {
+        if(nbt != null)
+            return nbt;
+        refreshNbt();
+        return nbt;
+    }
+
+    /**
+     * Shorthand to call saveMetaChanges and avoid deprecation warning 
+     */
+    @SuppressWarnings("deprecation")
+    public void saveNbt()
+    {
+//        nbt.saveMetaChanges(); // TODO: idk if I need to somehow save the data or not, probably new NBT api lib doesn't require it anymore.
+    }
+
+    public void applyMeta()
+    {
+        this.item.setItemMeta(this.meta);
+        refreshNbt();
+    }
+
+    public boolean hasChanged()
+    {
+        if(hasChanged_cached != null)
+            return hasChanged_cached;
+        if(originalItem == null)
+            return false;
+
+        hasChanged_cached = !originalItem.equals(item);
+        return hasChanged_cached;
+    }
+
+    public void refreshAll()
+    {
+        refreshNbt();
+        refreshMeta();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/Customizations.java

@@ -0,0 +1,513 @@
+package dev.lone.vanillacustomizer;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Multimap;
+import dev.lone.LoneLibs.annotations.Nullable;
+import dev.lone.vanillacustomizer.api.VanillaCustomizerApi;
+import dev.lone.vanillacustomizer.commands.registered.MainCommand;
+import dev.lone.vanillacustomizer.customization.changes.*;
+import dev.lone.vanillacustomizer.customization.Customization;
+import dev.lone.vanillacustomizer.customization.matchers.RuleNbtMatcher;
+import dev.lone.vanillacustomizer.customization.rules.*;
+import dev.lone.vanillacustomizer.nms.items.Rarity;
+import dev.lone.vanillacustomizer.utils.*;
+import org.apache.commons.io.FileUtils;
+import org.bukkit.ChatColor;
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeModifier;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.inventory.ItemFlag;
+import org.bukkit.inventory.ItemStack;
+
+import java.io.File;
+import java.util.*;
+
+public class Customizations
+{
+    public LinkedHashMap<String, Customization> customizations = new LinkedHashMap<>();
+
+    public void load()
+    {
+        customizations.clear();
+
+        for (File file : getAllYmlFiles())
+        {
+            ConfigFile config = new ConfigFile(Main.inst(), false, file.toPath().toString(), false, false);
+
+            ConfigurationSection cosmeticsSection = config.getConfigurationSection("customizations");
+            if (cosmeticsSection == null) // File has no rules
+                continue;
+
+            for (String key : cosmeticsSection.getKeys(false))
+            {
+                Customization customization = new Customization();
+                ConfigurationSection section = config.getConfigurationSection("customizations." + key);
+                assert section != null;
+
+                if(!section.getBoolean("enabled", true))
+                    continue;
+
+                // TODO: rules_match: ANY | ALL
+                ConfigurationSection rulesSection = section.getConfigurationSection("rules");
+                if (rulesSection == null)
+                {
+                    Main.msg.error("Error: Customization '" + key + "' missing 'rules'. File: " + config.getPartialFilePath());
+                    continue;
+                }
+
+                for (String matcherKey : rulesSection.getKeys(false))
+                {
+                    try
+                    {
+                        switch (matcherKey)
+                        {
+                            case "material_wildcards" ->
+                            {
+                                List<String> materialWildcards = rulesSection.getStringList(matcherKey);
+                                RuleMaterialWildcards rule = new RuleMaterialWildcards();
+                                for (String noMatch : rule.init(materialWildcards))
+                                {
+                                    Main.msg.warn("Warning: 'material_wildcards' -> '" + noMatch + "' of '" + key + "' has matched 0 items. File: " + config.getPartialFilePath());
+                                }
+                                customization.addRule(rule);
+                            }
+                            case "material" ->
+                            {
+                                String matStr = rulesSection.getString(matcherKey);
+                                Material material = EnumUtil.safeGet(matStr, Material.class, null);
+                                if (material == null)
+                                {
+                                    throwInvalidPropertyValue("material", matStr);
+//                                    Main.msg.error("Error: Customization '" + key + "' has invalid 'material'. File: " + config.getPartialFilePath());
+                                    break;
+                                }
+
+                                customization.addRule(new RuleMaterial(material));
+                            }
+                            case "materials" ->
+                            {
+                                List<String> matStrings = rulesSection.getStringList(matcherKey);
+                                List<Material> materials = new ArrayList<>();
+                                for (String matStr : matStrings)
+                                {
+                                    Material material = EnumUtil.safeGet(matStr, Material.class, null);
+                                    if (material == null)
+                                    {
+                                        throwInvalidPropertyValue("material", matStr);
+//                                        Main.msg.error("Error: Customization '" + key + "' has invalid 'material'. File: " + config.getPartialFilePath());
+                                    }
+                                    else
+                                    {
+                                        materials.add(material);
+                                    }
+                                }
+
+                                customization.addRule(new RuleMaterials(materials));
+                            }
+                            case "material_regex" ->
+                            {
+                                String regexStr = rulesSection.getString(matcherKey);
+                                RuleMaterialRegex ruleMaterialRegex = new RuleMaterialRegex(regexStr);
+                                customization.addRule(ruleMaterialRegex);
+                            }
+                            case "nbt" ->
+                            {
+                                RuleNbtMatcher nbtMatcher = new RuleNbtMatcher(
+                                        rulesSection.getString(matcherKey + ".path"),
+                                        rulesSection.getString(matcherKey + ".value"),
+                                        rulesSection.getString(matcherKey + ".type", "string")
+                                );
+                                customization.addRule(nbtMatcher);
+                            }
+                            // Matches only items which don't have custom lore and colored display name.
+                            case "is_vanilla_item" ->
+                            {
+                                boolean isVanilla = rulesSection.getBoolean(matcherKey);
+                                customization.addRule(new RuleVanillaItemMatcher(isVanilla));
+                            }
+                            case "rarity" ->
+                            {
+                                String rarityString = rulesSection.getString(matcherKey, "").toUpperCase();
+                                Rarity rarity = EnumUtil.safeGet(rarityString,
+                                        Rarity.class,
+                                        null);
+
+                                if(rarity == null)
+                                {
+                                    throwInvalidPropertyValue("rarity", rarityString);
+                                    continue;
+                                }
+                                RuleRarity rule = new RuleRarity(rarity);
+                                customization.addRule(rule);
+                            }
+                            case "placeable" ->
+                            {
+                                boolean is = rulesSection.getBoolean(matcherKey);
+                                customization.addRule(new RulePlaceable(is));
+                            }
+                            case "hardness_greater_than" ->
+                            {
+                                double val = rulesSection.getDouble(matcherKey);
+                                customization.addRule(new RuleHardnessGraterThan(val));
+                            }
+                            case "edible" ->
+                            {
+                                boolean val = rulesSection.getBoolean(matcherKey);
+                                customization.addRule(new RuleEdible(val));
+                            }
+                            case "smelted" ->
+                            {
+                                boolean val = rulesSection.getBoolean(matcherKey);
+                                customization.addRule(new RuleSmelted(val));
+                            }
+                        }
+                    }
+                    catch (Throwable ex)
+                    {
+                        if(ex instanceof InvalidCustomizationPropertyExtension)
+                        {
+                            Main.msg.error("Error loading customization '" + key + "'. File: " + config.getPartialFilePath());
+                            Main.msg.error(ex.getMessage());
+                        }
+                        else
+                            Main.msg.error("Error loading customization '" + key + "'. File: " + config.getPartialFilePath(), ex);
+                    }
+                }
+
+                ConfigurationSection changesSection = section.getConfigurationSection("changes");
+                if (changesSection == null)
+                {
+                    Main.msg.error("Error: Customization '" + key + "' missing 'changes'. File: " + config.getPartialFilePath());
+                    continue;
+                }
+
+                for (String changeKey : changesSection.getKeys(false))
+                {
+                    try
+                    {
+                        switch (changeKey)
+                        {
+                            case "rename" ->
+                            {
+                                String name = changesSection.getString(changeKey);
+                                assert name != null;
+                                customization.addChange(new Renamer(name));
+                            }
+                            case "rename_json" ->
+                            {
+                                String json = changesSection.getString(changeKey);
+                                customization.addChange(new RenamerJson(json));
+                            }
+                            case "replace_word_display_name" ->
+                            {
+                                ConfigurationSection thisSection = changesSection.getConfigurationSection(changeKey);
+                                if (thisSection == null)
+                                    throwInvalidConfig();
+                                String from = thisSection.getString("from");
+                                String to = thisSection.getString("to");
+                                customization.addChange(new ReplaceWordDisplayName(from, to));
+                            }
+                            case "lore_set" ->
+                            {
+                                List<String> list = changesSection.getStringList(changeKey);
+                                customization.addChange(new LoreSet(list));
+                            }
+                            case "lore_set_json" ->
+                            {
+                                List<String> list = changesSection.getStringList(changeKey);
+                                customization.addChange(new LoreSetJson(list));
+                            }
+                            case "lore_insert" ->
+                            {
+                                ConfigurationSection thisSection = changesSection.getConfigurationSection(changeKey);
+                                if (thisSection == null)
+                                    throwInvalidConfig();
+                                List<String> list = thisSection.getStringList("lines");
+                                int index = thisSection.getInt("index", 0);
+                                customization.addChange(new LoreInsert(list, index));
+                            }
+                            case "lore_insert_json" ->
+                            {
+                                ConfigurationSection thisSection = changesSection.getConfigurationSection(changeKey);
+                                if (thisSection == null)
+                                    throwInvalidConfig();
+                                List<String> list = thisSection.getStringList("lines");
+                                int index = thisSection.getInt("index", 0);
+                                customization.addChange(new LoreInsertJson(list, index));
+                            }
+                            case "replace_word_lore" ->
+                            {
+                                ConfigurationSection thisSection = changesSection.getConfigurationSection(changeKey);
+                                if (thisSection == null)
+                                    throwInvalidConfig();
+                                String from = thisSection.getString("from");
+                                String to = thisSection.getString("to");
+                                customization.addChange(new ReplaceWordLore(from, to));
+                            }
+                            case "protect_nbt_data" ->
+                            {
+                                customization.addChange(new ProtectNbtData());
+                            }
+                            case "durability" ->
+                            {
+                                short amount = (short) changesSection.getInt(changeKey);
+                                customization.addChange(new ReplaceDurability(amount));
+                            }
+                            case "custom_model_data" ->
+                            {
+                                int id = changesSection.getInt(changeKey);
+                                customization.addChange(new ReplaceCustomModelData(id));
+                            }
+                            case "add_enchants" ->
+                            {
+                                HashMap<Enchantment, Integer> enchants = new HashMap<>();
+                                List<String> enchantsStrings = changesSection.getStringList(changeKey);
+                                for (String enchantStringEntry : enchantsStrings)
+                                {
+                                    String[] tmp = enchantStringEntry.split(":");
+
+                                    Enchantment enchant = null;
+                                    int enchantLevel = 1;
+                                    if (tmp.length == 1)
+                                    {
+                                        enchant = Enchantment.getByName(tmp[0]);
+
+                                        if (enchant == null)
+                                            enchant = Enchantment.getByKey(NamespacedKey.minecraft(tmp[0]));
+                                    }
+                                    else if (tmp.length == 2)
+                                    {
+                                        if (Utilz.isNumeric(tmp[1]))
+                                        {
+                                            enchant = Enchantment.getByName(tmp[0]);
+                                            enchantLevel = Utilz.parseInt(tmp[1], 1);
+
+                                            if (enchant == null)
+                                                enchant = Enchantment.getByKey(NamespacedKey.minecraft(tmp[0]));
+                                        }
+                                        else
+                                        {
+                                            enchant = Enchantment.getByKey(new NamespacedKey(tmp[0], tmp[1]));
+                                        }
+                                    }
+                                    else if (tmp.length == 3)
+                                    {
+                                        enchant = Enchantment.getByKey(new NamespacedKey(tmp[0], tmp[1]));
+                                        enchantLevel = Utilz.parseInt(tmp[2], 1);
+                                    }
+
+                                    enchants.put(enchant, enchantLevel);
+                                }
+
+                                customization.addChange(new EnchantsAdd(enchants));
+                            }
+                            case "remove_enchants" ->
+                            {
+                                List<Enchantment> enchants = new ArrayList<>();
+                                List<String> enchantsStrings = changesSection.getStringList(changeKey);
+                                for (String enchantStringEntry : enchantsStrings)
+                                {
+                                    String[] tmp = enchantStringEntry.split(":");
+
+                                    Enchantment enchant = null;
+                                    if (tmp.length == 1)
+                                    {
+                                        enchant = Enchantment.getByName(tmp[0]);
+
+                                        if (enchant == null)
+                                            enchant = Enchantment.getByKey(NamespacedKey.minecraft(tmp[0]));
+                                    }
+                                    else if (tmp.length == 2)
+                                    {
+                                        if (Utilz.isNumeric(tmp[1]))
+                                        {
+                                            enchant = Enchantment.getByName(tmp[0]);
+                                            if (enchant == null)
+                                                enchant = Enchantment.getByKey(NamespacedKey.minecraft(tmp[0]));
+                                        }
+                                        else
+                                        {
+                                            enchant = Enchantment.getByKey(new NamespacedKey(tmp[0], tmp[1]));
+                                        }
+                                    }
+                                    else if (tmp.length == 3)
+                                    {
+                                        enchant = Enchantment.getByKey(new NamespacedKey(tmp[0], tmp[1]));
+                                    }
+
+                                    enchants.add(enchant);
+                                }
+
+                                customization.addChange(new EnchantsRemove(enchants));
+                            }
+                            case "add_attributes" ->
+                            {
+                                Multimap<Attribute, AttributeModifier> modifiers = ArrayListMultimap.create();
+                                ConfigurationSection thisSection = changesSection.getConfigurationSection(changeKey);
+                                if (thisSection == null)
+                                    throwInvalidConfig();
+
+                                Set<String> attributeEntriesKeys = thisSection.getKeys(false);
+                                for (String attributeEntryKey : attributeEntriesKeys)
+                                {
+                                    ConfigurationSection attributeSection = thisSection.getConfigurationSection(attributeEntryKey);
+                                    if (attributeSection == null)
+                                        throwInvalidConfig();
+
+                                    @Nullable String attributeStr = getStringOrThrow(attributeSection, "attribute");
+                                    Attribute attribute = Utilz.strToAttributeType(attributeStr);
+                                    if (attribute == null)
+                                        throwInvalidPropertyValue("attribute");
+                                    @Nullable String slotStr = getStringOrThrow(attributeSection, "slot");
+                                    EquipmentSlot slot = Utilz.strToVanillaEquipmentSlot(slotStr);
+                                    if (slot == null)
+                                        throwInvalidPropertyValue("slot");
+
+                                    @Nullable String name = getStringOrThrow(attributeSection, "name");
+                                    @Nullable String uuid = attributeSection.getString("uuid");
+                                    @Nullable String operation = getStringOrThrow(attributeSection, "operation");
+                                    @Nullable double amount = attributeSection.getDouble("amount", 0);
+
+                                    AttributeModifier modifier = AttributesAdd.generateModifier(
+                                            uuid,
+                                            name,
+                                            attribute,
+                                            amount,
+                                            operation,
+                                            slot
+                                    );
+
+                                    modifiers.put(attribute, modifier);
+                                }
+
+                                customization.addChange(new AttributesAdd(modifiers));
+                            }
+                            case "flags" ->
+                            {
+                                List<String> flagsStrings = changesSection.getStringList(changeKey);
+                                if (flagsStrings.size() == 0)
+                                    throwInvalidPropertyValue("flags");
+
+                                List<ItemFlag> flags = new ArrayList<>();
+
+                                for (String flagsString : flagsStrings)
+                                {
+                                    ItemFlag flag = EnumUtil.safeGet(flagsString, ItemFlag.class, null);
+                                    if(flag == null)
+                                    {
+                                        throwInvalidPropertyValue("flags", flagsString);
+                                        continue;
+                                    }
+
+                                    flags.add(flag);
+                                }
+
+                                customization.addChange(new FlagsAdd(flags));
+                            }
+                            case "material" ->
+                            {
+                                Material material = EnumUtil.safeGet(changesSection.getString(changeKey, "").toUpperCase(),
+                                        Material.class,
+                                        null);
+                                if (material == null)
+                                    throwInvalidPropertyValue("material");
+                                customization.addChange(new ReplaceMaterial(material));
+                            }
+                        }
+                    }
+                    catch (Throwable ex)
+                    {
+                        if(ex instanceof InvalidCustomizationPropertyExtension)
+                        {
+                            Main.msg.error("Error loading customization '" + key + "'. File: " + config.getPartialFilePath());
+                            Main.msg.error(ex.getMessage());
+                        }
+                        else
+                            Main.msg.error("Error loading customization '" + key + "'. File: " + config.getPartialFilePath(), ex);
+                    }
+                }
+
+
+                if (!customization.isEmpty())
+                {
+                    customizations.put(key, customization);
+                }
+            }
+        }
+    }
+
+    private String getStringOrThrow(ConfigurationSection section, String name)
+    {
+        @Nullable String value = section.getString(name);
+        if(value == null)
+            throwMissingProperty(name);
+        return value;
+    }
+
+    private void throwInvalidConfig()
+    {
+        throw new InvalidCustomizationPropertyExtension("Invalid configuration. Please check the tutorials.");
+    }
+
+    private void throwMissingProperty(String name)
+    {
+        throw new InvalidCustomizationPropertyExtension("Missing property '" + name + "'.");
+    }
+
+    private void throwInvalidPropertyValue(String name)
+    {
+        throw new InvalidCustomizationPropertyExtension("Invalid value for property '" + name + "'.");
+    }
+
+    private void throwInvalidPropertyValue(String name, String value)
+    {
+        throw new InvalidCustomizationPropertyExtension("Invalid value for property '" + name + "' -> '" + value + "'.");
+    }
+
+    public void handle(ItemStack itemStack, Player player)
+    {
+        if (itemStack == null || itemStack.getType() == Material.AIR)
+            return;
+
+        boolean trackChanges = MainCommand.hasDebugTag(player);
+        ChangeSession session = new ChangeSession(itemStack, trackChanges);
+        for (Map.Entry<String, Customization> entry : customizations.entrySet())
+        {
+            Customization customization = entry.getValue();
+            customization.handle(session);
+        }
+
+        // Warning! This doesn't edit the session data. Do not access use "customization" obj
+        // after this line since it would result not updated with changes done by the API handlers.
+        boolean apiExecuted = VanillaCustomizerApi.inst().executeHandlers(session.item, player);
+        // In case the API executed any code.
+        if(apiExecuted)
+            session.refreshAll();
+
+        if(trackChanges && session.hasChanged())
+        {
+            // TODO make it configurable
+            LoreInsert.putLine(session, 0, ChatColor.GOLD + SmallCaps.apply("VANILLACUSTOMIZER"));
+            //noinspection DataFlowIssue
+            if(session.refreshMeta().getLore().size() > 1)
+                LoreInsert.putLine(session, 1, " ");
+        }
+    }
+
+    private static List<File> getAllYmlFiles()
+    {
+        File cosmeticsDir = new File(Main.inst().getDataFolder().getAbsolutePath() + "/contents/");
+        if (!cosmeticsDir.exists())
+            cosmeticsDir.mkdirs();
+        return new ArrayList<>(FileUtils.listFiles(
+                cosmeticsDir,
+                new String[]{"yml"},
+                true
+        ));
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/InvalidCustomizationPropertyExtension.java

@@ -0,0 +1,9 @@
+package dev.lone.vanillacustomizer;
+
+public class InvalidCustomizationPropertyExtension extends IllegalArgumentException
+{
+    public InvalidCustomizationPropertyExtension(String text)
+    {
+        super(text);
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/Main.java

@@ -0,0 +1,159 @@
+package dev.lone.vanillacustomizer;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.wrappers.EnumWrappers;
+import com.comphenix.protocol.wrappers.Pair;
+import dev.lone.LoneLibs.chat.Msg;
+import dev.lone.vanillacustomizer.commands.Commands;
+import dev.lone.vanillacustomizer.nms.items.ItemsNms;
+import dev.lone.vanillacustomizer.utils.Packets;
+import org.bukkit.Bukkit;
+import org.bukkit.GameMode;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerGameModeChangeEvent;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.MerchantRecipe;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.util.List;
+
+public final class Main extends JavaPlugin implements Listener
+{
+    // Useful:
+    // https://lingojam.com/MinecraftSmallFont
+    // https://game8.co/games/Minecraft/archives/378457#hl_1
+
+    //DO NOT SET AS "final" OR SPIGOT.MC won't replace it.
+    public static String b = "%%__USER__%%";
+    public static Msg msg;
+
+    private static Main inst;
+
+    public static Main inst()
+    {
+        return inst;
+    }
+
+    Customizations customizations;
+
+    @Override
+    public void onEnable()
+    {
+        inst = this;
+
+        msg = new Msg("[VanillaCustomizer] ");
+
+        Bukkit.getPluginManager().registerEvents(this, this);
+
+        ItemsNms.inst().initialize();
+
+        customizations = new Customizations();
+
+        // https://nms.screamingsandals.org/1.19/net/minecraft/network/protocol/game/ClientboundContainerSetContentPacket.html
+        Packets.out(this, PacketType.Play.Server.WINDOW_ITEMS, e -> {
+            Player player = e.getPlayer();
+            if(player.getGameMode() == GameMode.CREATIVE)
+                return;
+
+            PacketContainer packet = e.getPacket();
+            List<ItemStack> items = packet.getItemListModifier().read(0);
+            ItemStack carriedItem = packet.getItemModifier().read(0);
+
+            for (ItemStack item : items)
+            {
+                customizations.handle(item, player);
+            }
+
+            customizations.handle(carriedItem, player);
+        });
+
+        // https://nms.screamingsandals.org/1.19/net/minecraft/network/protocol/game/ClientboundSetEquipmentPacket.html
+        Packets.out(this, PacketType.Play.Server.ENTITY_EQUIPMENT, e -> {
+            Player player = e.getPlayer();
+            if(player.getGameMode() == GameMode.CREATIVE)
+                return;
+
+            PacketContainer packet = e.getPacket();
+            List<Pair<EnumWrappers.ItemSlot, ItemStack>> slotsPairs = packet.getSlotStackPairLists().read(0);
+
+            for (Pair<EnumWrappers.ItemSlot, ItemStack> pair : slotsPairs)
+            {
+                customizations.handle(pair.getSecond(), player);
+            }
+        });
+
+        // https://nms.screamingsandals.org/1.19.2/net/minecraft/network/protocol/game/ClientboundContainerSetSlotPacket.html
+        Packets.out(this, PacketType.Play.Server.SET_SLOT, e -> {
+            Player player = e.getPlayer();
+            if(player.getGameMode() == GameMode.CREATIVE)
+                return;
+
+            PacketContainer packet = e.getPacket();
+
+            ItemStack itemStack = packet.getItemModifier().read(0);
+            customizations.handle(itemStack, player);
+        });
+
+        // https://mappings.cephx.dev/1.20.1/net/minecraft/network/protocol/game/ClientboundMerchantOffersPacket.html
+        Packets.out(this, PacketType.Play.Server.OPEN_WINDOW_MERCHANT, e -> {
+            Player player = e.getPlayer();
+            if(player.getGameMode() == GameMode.CREATIVE)
+                return;
+
+            PacketContainer packet = e.getPacket();
+            List<MerchantRecipe> recipes = packet.getMerchantRecipeLists().read(0);
+            for (int i = 0, recipesSize = recipes.size(); i < recipesSize; i++)
+            {
+                // NOTE: for some reason, I don't know why, if I don't clone the items they actually get edited in-game!
+                // I'm sure since if I quit the server, remove the plugin and join I still see the edited recipes!
+                MerchantRecipe recipe = recipes.get(i);
+                List<ItemStack> ingredients = recipe.getIngredients();
+                for (int j = 0, ingredientsSize = ingredients.size(); j < ingredientsSize; j++)
+                {
+                    ItemStack itemStack = ingredients.get(j).clone();
+                    customizations.handle(itemStack, player);
+                    ingredients.set(j, itemStack);
+                }
+
+                ItemStack result = recipe.getResult().clone();
+                customizations.handle(result, player);
+
+                MerchantRecipe newRecipe = new MerchantRecipe(result, recipe.getMaxUses());
+                newRecipe.setUses(recipe.getUses());
+                newRecipe.setDemand(recipe.getDemand());
+                newRecipe.setPriceMultiplier(recipe.getPriceMultiplier());
+                newRecipe.setExperienceReward(recipe.hasExperienceReward());
+                newRecipe.setSpecialPrice(recipe.getSpecialPrice());
+                newRecipe.setIngredients(ingredients);
+                newRecipe.setVillagerExperience(recipe.getVillagerExperience());
+
+                recipes.set(i, newRecipe);
+            }
+
+            packet.getMerchantRecipeLists().write(0, recipes);
+        });
+
+        Commands.register(this);
+
+        reload();
+    }
+
+    public void reload()
+    {
+        customizations.load();
+    }
+
+    @EventHandler(ignoreCancelled = true)
+    private void onGamemode(PlayerGameModeChangeEvent e)
+    {
+        // This is important to force the player inventory to update ( #updateInventory() triggers WINDOW_ITEMS packet)
+        // so that the CREATIVE gamemode won't edit the items, as CREATIVE makes the client apply any visual change
+        // to the items, the game works like that, for example custom clients can create any NBT item while in CREATIVE.
+        Bukkit.getScheduler().runTaskLater(this, () -> {
+            e.getPlayer().updateInventory();
+        }, 5L);
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/api/VanillaCustomizerApi.java

@@ -0,0 +1,75 @@
+package dev.lone.vanillacustomizer.api;
+
+import dev.lone.vanillacustomizer.Main;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.server.PluginDisableEvent;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.plugin.Plugin;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@SuppressWarnings("unused")
+public class VanillaCustomizerApi implements Listener
+{
+    //<editor-fold desc="Exposed API">
+    public static VanillaCustomizerApi inst()
+    {
+        if(inst == null)
+            inst = new VanillaCustomizerApi(Main.inst());
+        return inst;
+    }
+
+    public void registerHandler(Plugin plugin, CustomizerHandler handler)
+    {
+        handlers.computeIfAbsent(plugin, plugin1 -> new ArrayList<>()).add(handler);
+    }
+
+    @FunctionalInterface
+    public interface CustomizerHandler
+    {
+        void call(Player player, ItemStack itemStack);
+    }
+    //</editor-fold>
+
+    //<editor-fold desc="Internal methods">
+    private static final HashMap<Plugin, List<CustomizerHandler>> handlers = new HashMap<>();
+
+    private static VanillaCustomizerApi inst;
+
+    VanillaCustomizerApi(Plugin plugin)
+    {
+        Bukkit.getPluginManager().registerEvents(this, plugin);
+    }
+
+    public boolean executeHandlers(ItemStack itemStack, Player player)
+    {
+        if(handlers.size() == 0)
+            return false;
+
+        boolean executedAnything = false;
+        for (Map.Entry<Plugin, List<CustomizerHandler>> entry : handlers.entrySet())
+        {
+            List<CustomizerHandler> handlers = entry.getValue();
+            for (CustomizerHandler handler : handlers)
+            {
+                handler.call(player, itemStack);
+                executedAnything = true;
+            }
+        }
+
+        return executedAnything;
+    }
+
+    @EventHandler
+    private void pluginUnload(PluginDisableEvent e)
+    {
+        handlers.remove(e.getPlugin());
+    }
+    //</editor-fold>
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/commands/CommandRun.java

@@ -0,0 +1,38 @@
+package dev.lone.vanillacustomizer.commands;
+
+import dev.lone.LoneLibs.annotations.NotNull;
+import org.bukkit.command.*;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.util.List;
+
+public abstract class CommandRun implements CommandExecutor, TabCompleter
+{
+    protected CommandRun(JavaPlugin plugin, String name)
+    {
+        plugin.getCommand(name).setExecutor(this);
+        plugin.getCommand(name).setTabCompleter(this);
+    }
+
+    protected abstract void run(Player sender, Command command, String label, String[] args);
+
+    protected abstract void run(ConsoleCommandSender sender, Command command, String label, String[] args);
+
+    @Override
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args)
+    {
+        if(sender instanceof Player)
+            run((Player) sender, command, label, args);
+        else if(sender instanceof ConsoleCommandSender)
+            run((ConsoleCommandSender) sender, command, label, args);
+
+        return true;
+    }
+
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender sender, Command command, @NotNull String alias, @NotNull String[] args)
+    {
+        return List.of();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/commands/Commands.java

@@ -0,0 +1,12 @@
+package dev.lone.vanillacustomizer.commands;
+
+import dev.lone.vanillacustomizer.commands.registered.MainCommand;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class Commands
+{
+    public static void register(JavaPlugin plugin)
+    {
+        new MainCommand(plugin, "vanillacustomizer");
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/commands/registered/MainCommand.java

@@ -0,0 +1,135 @@
+package dev.lone.vanillacustomizer.commands.registered;
+
+import dev.lone.LoneLibs.annotations.NotNull;
+import dev.lone.vanillacustomizer.Main;
+import dev.lone.vanillacustomizer.commands.CommandRun;
+import dev.lone.vanillacustomizer.utils.SmallCaps;
+import fr.mrmicky.fastinv.FastInv;
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.ConsoleCommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.metadata.FixedMetadataValue;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.stream.IntStream;
+
+public class MainCommand extends CommandRun
+{
+    HashMap<Player, Integer> playerPage = new HashMap<>();
+
+    public MainCommand(JavaPlugin plugin, String name)
+    {
+        super(plugin, name);
+    }
+
+    public static boolean hasDebugTag(Player player)
+    {
+        return player.hasMetadata("showdebugtag");
+    }
+
+    @Override
+    public void run(Player player, Command command, String label, String[] args)
+    {
+        if(args.length >= 1)
+        {
+            switch (args[0])
+            {
+                case "showdebugtag":
+                    boolean showdebugtag = hasDebugTag(player);
+                    if (showdebugtag)
+                        Main.msg.send(player, "Disabled debug tag");
+
+                    else
+                        Main.msg.send(player, "Enabled debug tag");
+
+                    if (!showdebugtag)
+                        player.setMetadata("showdebugtag", new FixedMetadataValue(Main.inst(), 0));
+                    else
+                        player.removeMetadata("showdebugtag", Main.inst());
+
+                    // To trigger refresh
+                    player.updateInventory();
+                    break;
+
+                case "small":
+
+                    String text = args[1];
+                    Main.msg.send(player, SmallCaps.apply(text));
+                    break;
+                case "debugmenu":
+
+                    FastInv inv = new FastInv(54);
+
+                    int page = 0;
+                    playerPage.put(player, page);
+                    loadPage(inv, page);
+
+                    inv.setItem(52, new ItemStack(Material.WHITE_CONCRETE), e -> {
+                        // todo check >= 0
+                        playerPage.put(player, playerPage.get(player) - 1);
+                        loadPage(inv, playerPage.get(player));
+                    });
+
+                    inv.setItem(53, new ItemStack(Material.RED_CONCRETE), e -> {
+                        playerPage.put(player, playerPage.get(player) + 1);
+                        loadPage(inv, playerPage.get(player));
+                    });
+
+                    inv.open(player);
+
+                    break;
+                case "reload":
+                    Main.inst().reload();
+                    Bukkit.getOnlinePlayers().forEach(Player::updateInventory);
+                    Main.msg.send(player, "Reloaded configs.");
+                    break;
+            }
+        }
+    }
+
+    @Override
+    public void run(ConsoleCommandSender sender, Command command, String label, String[] args)
+    {
+        if(args.length >= 1)
+        {
+            switch (args[0])
+            {
+                case "reload":
+                    Main.inst().reload();
+                    Bukkit.getOnlinePlayers().forEach(Player::updateInventory);
+                    Main.msg.send(sender, "Reloaded configs.");
+                    return;
+            }
+        }
+
+        sender.sendMessage("This command can be run only by players!");
+    }
+
+    private void loadPage(FastInv inv, int page)
+    {
+        inv.removeItems(IntStream.rangeClosed(0, 44).toArray());
+        Material[] values = Material.values();
+        int j = 0;
+        for (int i = page * 45; j < 45 && i < values.length; i++)
+        {
+            Material mat = values[i];
+            if (mat.isItem())
+            {
+                inv.addItem(new ItemStack(mat));
+                j++;
+            }
+        }
+    }
+
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender sender, Command command, @NotNull String alias, @NotNull String[] args)
+    {
+        return List.of("reload", "showdebugtag", "small", "debugmenu");
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/Customization.java

@@ -0,0 +1,52 @@
+package dev.lone.vanillacustomizer.customization;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.vanillacustomizer.customization.changes.IChange;
+import dev.lone.vanillacustomizer.customization.rules.IRule;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Customization
+{
+    public List<IRule> rules = new ArrayList<>();
+    public List<IChange> changes = new ArrayList<>();
+
+    public boolean isEmpty()
+    {
+        return rules.isEmpty() && changes.isEmpty();
+    }
+
+    public void addRule(IRule rule)
+    {
+        rules.add(rule);
+    }
+
+    public void addChange(IChange change)
+    {
+        changes.add(change);
+    }
+
+    public boolean matchesAll(ChangeSession session)
+    {
+        for (IRule rule : rules)
+        {
+            if(!rule.matches(session))
+                return false;
+        }
+        return true;
+    }
+
+    //TODO: maybe implement also matchAny?
+    public void handle(ChangeSession session)
+    {
+        if(matchesAll(session))
+        {
+            for (IChange change : changes)
+            {
+                change.apply(session);
+            }
+        }
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/AttributesAdd.java

@@ -0,0 +1,83 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Multimap;
+import dev.lone.vanillacustomizer.ChangeSession;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeModifier;
+import org.bukkit.inventory.EquipmentSlot;
+import dev.lone.LoneLibs.annotations.NotNull;
+import dev.lone.LoneLibs.annotations.Nullable;
+
+import java.util.UUID;
+
+public class AttributesAdd implements IChange
+{
+    Multimap<Attribute, AttributeModifier> modifiers;
+
+    public AttributesAdd(Multimap<Attribute, AttributeModifier> modifiers)
+    {
+        this.modifiers = modifiers;
+    }
+
+    public static AttributeModifier generateModifier(@Nullable String uuid,
+                                                     String name,
+                                                     Attribute attribute,
+                                                     double value,
+                                                     @NotNull String operation,
+                                                     EquipmentSlot slot)
+    {
+        AttributeModifier.Operation op;
+        if (operation.equals("multiply_base"))
+            op = AttributeModifier.Operation.ADD_SCALAR;
+        else if (operation.equals("multiply"))
+            op = AttributeModifier.Operation.MULTIPLY_SCALAR_1;
+        else
+            op = AttributeModifier.Operation.ADD_NUMBER;
+
+        return new AttributeModifier(
+                uuid != null ? UUID.fromString(uuid) : UUID.nameUUIDFromBytes((attribute + op.name() + value + slot).getBytes()),
+                name,
+                value,
+                op,
+                slot
+        );
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        session.refreshMeta();
+
+        Multimap<Attribute, AttributeModifier> finalModifiers = ArrayListMultimap.create();
+        if(session.meta.hasAttributeModifiers())
+        {
+            Multimap<Attribute, AttributeModifier> originalAttributes = session.meta.getAttributeModifiers();
+            assert originalAttributes != null;
+            originalAttributes.forEach((attribute, attributeModifier) -> {
+                modifiers.forEach((newAttr, newMod) -> {
+                    // If the item already has the same attribute with same UUID I have to replace it with the
+                    // new attribute provided in the configuration.
+                    if(attributeModifier.getUniqueId().equals(newMod.getUniqueId()))
+                    {
+                        finalModifiers.put(newAttr, newMod);
+                    }
+                    // Otherwise I have to put both as they don't interfere.
+                    else
+                    {
+                        finalModifiers.put(attribute, attributeModifier);
+                        finalModifiers.put(newAttr, newMod);
+                    }
+                });
+            });
+            modifiers.forEach(finalModifiers::put);
+            session.meta.setAttributeModifiers(finalModifiers);
+        }
+        else
+        {
+            session.meta.setAttributeModifiers(modifiers);
+        }
+
+        session.applyMeta();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/AttributesRemove.java

@@ -0,0 +1,64 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Multimap;
+import dev.lone.vanillacustomizer.ChangeSession;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeModifier;
+import org.bukkit.inventory.EquipmentSlot;
+import dev.lone.LoneLibs.annotations.NotNull;
+import dev.lone.LoneLibs.annotations.Nullable;
+
+import java.util.UUID;
+
+@Deprecated //TODO
+public class AttributesRemove implements IChange
+{
+    Multimap<Attribute, AttributeModifier> modifiers;
+
+    public AttributesRemove(Multimap<Attribute, AttributeModifier> modifiers)
+    {
+        this.modifiers = modifiers;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        session.refreshMeta();
+
+        if (!session.meta.hasAttributeModifiers())
+            return;
+
+        Multimap<Attribute, AttributeModifier> finalModifiers = ArrayListMultimap.create();
+        Multimap<Attribute, AttributeModifier> originalAttributes = session.meta.getAttributeModifiers();
+        assert originalAttributes != null;
+//        modifiers.forEach((attrRemove, modRemove) -> {
+//
+//            if(originalAttributes.containsKey(attrRemove))
+//            {
+//                if()
+//            }
+//
+//            // If the item already has the same attribute with same UUID I have to replace it with the
+//            // new attribute provided in the configuration.
+//            if(attributeModifier.getUniqueId().equals(modRemove.getUniqueId()))
+//            {
+//                finalModifiers.put(attrRemove, modRemove);
+//            }
+//            // Otherwise I have to put both as they don't interfere.
+//            else
+//            {
+//                finalModifiers.put(attribute, attributeModifier);
+//                finalModifiers.put(attrRemove, modRemove);
+//            }
+//        });
+//
+//        originalAttributes.forEach((attribute, attributeModifier) -> {
+//
+//        });
+//        modifiers.forEach(finalModifiers::put);
+//        session.meta.setAttributeModifiers(finalModifiers);
+//
+//        session.applyMeta();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/EnchantsAdd.java

@@ -0,0 +1,37 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import org.bukkit.enchantments.Enchantment;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class EnchantsAdd implements IChange
+{
+    final HashMap<Enchantment, Integer> enchants;
+
+    public EnchantsAdd(HashMap<Enchantment, Integer> enchants)
+    {
+        this.enchants = enchants;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        if(session.refreshMeta() == null)
+            return;
+
+        for (Map.Entry<Enchantment, Integer> e : enchants.entrySet())
+        {
+            Enchantment enchantment = e.getKey();
+            Integer level = e.getValue();
+
+            if(level <= 0)
+                session.meta.removeEnchant(enchantment);
+            else
+                session.meta.addEnchant(enchantment, level, true);
+        }
+
+        session.applyMeta();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/EnchantsRemove.java

@@ -0,0 +1,30 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import org.bukkit.enchantments.Enchantment;
+
+import java.util.List;
+
+public class EnchantsRemove implements IChange
+{
+    final List<Enchantment> enchants;
+
+    public EnchantsRemove(List<Enchantment> enchants)
+    {
+        this.enchants = enchants;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        if(session.refreshMeta() == null)
+            return;
+
+        for (Enchantment enchant : enchants)
+        {
+            session.meta.removeEnchant(enchant);
+        }
+
+        session.applyMeta();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/FlagsAdd.java

@@ -0,0 +1,24 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import org.bukkit.inventory.ItemFlag;
+
+import java.util.List;
+
+public class FlagsAdd implements IChange
+{
+    final ItemFlag[] flags;
+
+    public FlagsAdd(List<ItemFlag> flags)
+    {
+        this.flags = flags.toArray(ItemFlag[]::new);
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        session.refreshMeta();
+        session.meta.addItemFlags(flags);
+        session.applyMeta();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/IChange.java

@@ -0,0 +1,23 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.vanillacustomizer.nms.items.ItemsNms;
+
+public interface IChange
+{
+    void apply(ChangeSession session);
+
+    static String replacePlaceholders(ChangeSession session, String str)
+    {
+        if(session.item.getType().isEdible())
+        {
+            str = str.replace("{food}", String.valueOf(ItemsNms.nms().getNutrition(session.item)));
+            str = str.replace("{saturation}", String.valueOf(ItemsNms.nms().getSaturation(session.item)));
+        }
+
+        if(session.item.getType().isBlock())
+            str = str.replace("{hardness}", String.valueOf(ItemsNms.nms().getDestroySpeed(session.item)));
+
+        return str;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/LoreInsert.java

@@ -0,0 +1,68 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTList;
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.LoneLibs.chat.Comp;
+import dev.lone.vanillacustomizer.utils.ConfigFile;
+
+import java.util.List;
+
+public class LoreInsert implements IChange
+{
+    private final List<String> lines;
+    private final int index;
+
+    public LoreInsert(List<String> lines, int index)
+    {
+        this.lines = ConfigFile.getColored(lines);
+        this.index = index;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+
+        if(!display.hasTag("Lore"))
+        {
+            NBTList<String> lore = display.getStringList("Lore");
+            for (String line : lines)
+                lore.add(Comp.legacyToJson(IChange.replacePlaceholders(session, line)));
+        }
+        else
+        {
+            NBTList<String> lore = display.getStringList("Lore");
+            // If the index is correctly inside the already existing lore range I can put the new lines there.
+            if(index < lore.size())
+            {
+                int i = index;
+                for (String line : lines)
+                {
+                    lore.add(i, Comp.legacyToJson(IChange.replacePlaceholders(session, line)));
+                    i++;
+                }
+            }
+            else // If it's out of bounds I just append at the end.
+            {
+                for (String line : lines)
+                    lore.add(Comp.legacyToJson(IChange.replacePlaceholders(session, line)));
+            }
+        }
+
+        session.saveNbt();
+    }
+
+    public static void putLine(ChangeSession session, int index, String line)
+    {
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+
+        NBTList<String> lore = display.getStringList("Lore");
+        lore.add(index, Comp.legacyToJson(line));
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/LoreInsertJson.java

@@ -0,0 +1,53 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTList;
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.vanillacustomizer.utils.Utilz;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class LoreInsertJson implements IChange
+{
+    private final List<String> linesJson;
+    private final int index;
+
+    public LoreInsertJson(List<String> linesJson, int index)
+    {
+        this.linesJson = Utilz.fixJsonFormatting(linesJson);
+        this.index = index;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+
+        List<String> newLinesJson = new ArrayList<>();
+        for (String lineJson : linesJson)
+            newLinesJson.add(IChange.replacePlaceholders(session, lineJson));
+
+        if(!display.hasTag("Lore"))
+        {
+            NBTList<String> lore = display.getStringList("Lore");
+            lore.addAll(newLinesJson);
+        }
+        else
+        {
+            NBTList<String> lore = display.getStringList("Lore");
+            if(index < lore.size())
+            {
+                lore.addAll(index, newLinesJson);
+            }
+            else
+            {
+                lore.addAll(newLinesJson);
+            }
+        }
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/LoreSet.java

@@ -0,0 +1,34 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTList;
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.LoneLibs.chat.Comp;
+import dev.lone.vanillacustomizer.utils.ConfigFile;
+
+import java.util.List;
+
+public class LoreSet implements IChange
+{
+    private final List<String> lines;
+
+    public LoreSet(List<String> lines)
+    {
+        this.lines = ConfigFile.getColored(lines);
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+
+        display.removeKey("Lore");
+        NBTList<String> lore = display.getStringList("Lore");
+        for (String line : lines)
+            lore.add(Comp.legacyToJson(IChange.replacePlaceholders(session, line)));
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/LoreSetJson.java

@@ -0,0 +1,39 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTList;
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.LoneLibs.chat.Comp;
+import dev.lone.vanillacustomizer.utils.Utilz;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class LoreSetJson implements IChange
+{
+    private final List<String> linesJson;
+
+    public LoreSetJson(List<String> linesJson)
+    {
+        this.linesJson = Utilz.fixJsonFormatting(linesJson);
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+
+        display.removeKey("Lore");
+        NBTList<String> lore = display.getStringList("Lore");
+
+        List<String> newLinesJson = new ArrayList<>();
+        for (String lineJson : linesJson)
+            newLinesJson.add(IChange.replacePlaceholders(session, lineJson));
+
+        lore.addAll(newLinesJson);
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/ProtectNbtData.java

@@ -0,0 +1,17 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.vanillacustomizer.ChangeSession;
+
+public class ProtectNbtData implements IChange
+{
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        nbt.removeKey("PublicBukkitValues");
+        nbt.removeKey("itemsadder");
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/Renamer.java

@@ -0,0 +1,29 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.LoneLibs.chat.Comp;
+import dev.lone.vanillacustomizer.utils.ConfigFile;
+import org.bukkit.ChatColor;
+
+public class Renamer implements IChange
+{
+    private final String name;
+
+    public Renamer(String name)
+    {
+        name = ConfigFile.convertColor(name);
+        this.name = !name.startsWith("&f") ? ChatColor.WHITE + name : name;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+        display.setString("Name", Comp.legacyToJson(IChange.replacePlaceholders(session, name)));
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/RenamerJson.java

@@ -0,0 +1,31 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.LoneLibs.chat.Comp;
+import dev.lone.vanillacustomizer.utils.Utilz;
+
+public class RenamerJson implements IChange
+{
+    private final String json;
+
+    public RenamerJson(String json)
+    {
+        // This should validate if the json is valid and throw an exception if not.
+        // NOTE: test if it is actually the case.
+        Comp.jsonToComponent(json);
+
+        this.json = Utilz.fixJsonFormatting(json);
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+        display.setString("Name", IChange.replacePlaceholders(session, json));
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/ReplaceCustomModelData.java

@@ -0,0 +1,23 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.vanillacustomizer.ChangeSession;
+
+public class ReplaceCustomModelData implements IChange
+{
+    private final int id;
+
+    public ReplaceCustomModelData(int id)
+    {
+        this.id = id;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        nbt.setInteger("CustomModelData", id);
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/ReplaceDurability.java

@@ -0,0 +1,24 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import org.bukkit.inventory.meta.Damageable;
+
+public class ReplaceDurability implements IChange
+{
+    private final short amount;
+
+    public ReplaceDurability(short amount)
+    {
+        this.amount = amount;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        Damageable damageable = (Damageable) session.refreshMeta();
+        assert damageable != null;
+
+        short max = session.item.getType().getMaxDurability();
+        damageable.setDamage(amount > max ? 0 : (short) (max - amount));
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/ReplaceMaterial.java

@@ -0,0 +1,21 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import org.bukkit.Material;
+
+public class ReplaceMaterial implements IChange
+{
+    private final Material material;
+
+    public ReplaceMaterial(Material material)
+    {
+        this.material = material;
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        session.item.setType(material);
+        session.refreshAll(); // Idk if it's needed
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/ReplaceWordDisplayName.java

@@ -0,0 +1,36 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.LoneLibs.chat.Comp;
+import dev.lone.vanillacustomizer.utils.ConfigFile;
+
+public class ReplaceWordDisplayName implements IChange
+{
+    private final String from;
+    private final String to;
+
+    public ReplaceWordDisplayName(String from, String to)
+    {
+        this.from = ConfigFile.convertColor(from);
+        this.to = ConfigFile.convertColor(to);
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        if(session.refreshMeta() == null)
+            return;
+        if(!session.refreshMeta().hasDisplayName())
+            return;
+
+        String name = session.refreshMeta().getDisplayName().replace(from, to);
+
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+        display.setString("Name", Comp.legacyToJson(name));
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/changes/ReplaceWordLore.java

@@ -0,0 +1,46 @@
+package dev.lone.vanillacustomizer.customization.changes;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTList;
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.LoneLibs.chat.Comp;
+import dev.lone.vanillacustomizer.utils.ConfigFile;
+import lonelibs.net.kyori.adventure.text.Component;
+import lonelibs.net.kyori.adventure.text.TextReplacementConfig;
+
+public class ReplaceWordLore implements IChange
+{
+    TextReplacementConfig textReplacement;
+
+    public ReplaceWordLore(String from, String to)
+    {
+        from = ConfigFile.convertColor(from);
+        to = ConfigFile.convertColor(to);
+
+        textReplacement = TextReplacementConfig.builder()
+                .match(from)
+                .replacement(to)
+                .build();
+    }
+
+    @Override
+    public void apply(ChangeSession session)
+    {
+        NBTItem nbt = session.nbt();
+        NBTCompound display = nbt.getOrCreateCompound("display");
+        if(!display.hasTag("Lore"))
+            return;
+
+        NBTList<String> lore = display.getStringList("Lore");
+        for (int i = 0; i < lore.size(); i++)
+        {
+            String lineJson = lore.get(i);
+            Component component = Comp.jsonToComponent(lineJson);
+            component = component.replaceText(textReplacement);
+            lore.set(i, Comp.componentToJson(component));
+        }
+
+        session.saveNbt();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/matchers/ITextMatcher.java

@@ -0,0 +1,6 @@
+package dev.lone.vanillacustomizer.customization.matchers;
+
+public interface ITextMatcher
+{
+    boolean matches(String text);
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/matchers/RegexMatcher.java

@@ -0,0 +1,19 @@
+package dev.lone.vanillacustomizer.customization.matchers;
+
+import java.util.regex.Pattern;
+
+public class RegexMatcher implements ITextMatcher
+{
+    final Pattern regex;
+
+    public RegexMatcher(String regexStr)
+    {
+        regex = Pattern.compile(regexStr);
+    }
+
+    @Override
+    public boolean matches(String text)
+    {
+        return regex.matcher(text).matches();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/matchers/RuleNbtMatcher.java

@@ -0,0 +1,107 @@
+package dev.lone.vanillacustomizer.customization.matchers;
+
+import dev.lone.LoneLibs.nbt.nbtapi.NBTCompound;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTItem;
+import dev.lone.LoneLibs.nbt.nbtapi.NBTType;
+import dev.lone.vanillacustomizer.customization.rules.IRule;
+import org.apache.commons.lang.StringUtils;
+import org.bukkit.ChatColor;
+import org.bukkit.inventory.ItemStack;
+
+public class RuleNbtMatcher implements IRule
+{
+    final String nbtPath;
+    Object nbtValue;
+
+    String[] nbtPathSplit;
+
+    NBTType nbtValueType;
+
+    public RuleNbtMatcher(String nbtPath, String nbtValueStr, String nbtValueTypeStr)
+    {
+        this.nbtPath = nbtPath;
+        this.nbtValue = nbtValueStr;
+
+        String nbtTypeFixed = "NBTTag" + StringUtils.capitalize(nbtValueTypeStr.toLowerCase());
+
+        try
+        {
+            nbtValueType = NBTType.valueOf(nbtTypeFixed);
+        }
+        catch(IllegalArgumentException exc)
+        {
+            throw new IllegalArgumentException("Unknown nbt.type '" + nbtValueTypeStr + "' for nbt path '" + nbtPath + "'." +
+                    ChatColor.GRAY + " Allowed: string, int, float, double, byte, short");
+        }
+
+        switch (nbtValueType)
+        {
+            case NBTTagString:
+                break;
+            case NBTTagInt:
+                nbtValue = Integer.parseInt(nbtValueStr);
+                break;
+            case NBTTagFloat:
+                nbtValue = Float.parseFloat(nbtValueStr);
+                break;
+            case NBTTagDouble:
+                nbtValue = Double.parseDouble(nbtValueStr);
+                break;
+            case NBTTagByte:
+                nbtValue = Byte.parseByte(nbtValueStr);
+            case NBTTagShort:
+                nbtValue = Short.parseShort(nbtValueStr);
+                break;
+        }
+
+        this.nbtPathSplit = nbtPath.split("\\.");
+    }
+
+    public String getNbtPath()
+    {
+        return nbtPath;
+    }
+
+    public Object getNbtValue()
+    {
+        return nbtValue;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        NBTItem nbt = new NBTItem(item);
+
+        if (!nbt.hasTag(nbtPathSplit[0]))
+            return false;
+
+        NBTCompound currentCompound = nbt.getCompound(nbtPathSplit[0]);
+        for(int i=1; i<nbtPathSplit.length-1; i++)
+        {
+            if (!currentCompound.hasTag(nbtPathSplit[i]))
+                return false;
+            currentCompound = currentCompound.getCompound(nbtPathSplit[i]);
+        }
+        if (!currentCompound.hasTag(nbtPathSplit[nbtPathSplit.length-1]))
+            return false;
+
+        NBTType nbtType = currentCompound.getType(nbtPathSplit[nbtPathSplit.length-1]);
+        if (nbtType != nbtValueType)
+            return false;
+
+        if (nbtType == NBTType.NBTTagString)
+            return (currentCompound.getString(nbtPathSplit[nbtPathSplit.length-1]).equals(nbtValue));
+        else if (nbtType == NBTType.NBTTagInt)
+            return (currentCompound.getInteger(nbtPathSplit[nbtPathSplit.length-1]).equals(nbtValue));
+        else if (nbtType == NBTType.NBTTagDouble)
+            return (currentCompound.getDouble(nbtPathSplit[nbtPathSplit.length-1]).equals(nbtValue));
+        else if (nbtType == NBTType.NBTTagFloat)
+            return (currentCompound.getFloat(nbtPathSplit[nbtPathSplit.length-1]).equals(nbtValue));
+        else if (nbtType == NBTType.NBTTagByte)
+            return (currentCompound.getByte(nbtPathSplit[nbtPathSplit.length-1]).equals(nbtValue));
+        else if (nbtType == NBTType.NBTTagShort)
+            return (currentCompound.getShort(nbtPathSplit[nbtPathSplit.length-1]).equals(nbtValue));
+
+        return false;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/matchers/WildcardsMatcher.java

@@ -0,0 +1,83 @@
+package dev.lone.vanillacustomizer.customization.matchers;
+
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.io.IOCase;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Deprecated
+public class WildcardsMatcher implements ITextMatcher
+{
+//    private List<String> wildcardStart;
+//    private List<String> wildcardEnd;
+//    private List<String> wildcardContains;
+    private List<String> wildcards;
+
+    public void addWildcard(String wildcard)
+    {
+//        String cleanMatcher = wildcard.replace("*", "");
+//        if(wildcard.startsWith("*") && wildcard.endsWith("*"))
+//        {
+//            if (wildcardContains == null)
+//                wildcardContains = new ArrayList<>();
+//            wildcardContains.add(cleanMatcher);
+//        }
+//        else
+//        {
+//            if (wildcard.startsWith("*"))
+//            {
+//                if (wildcardStart == null)
+//                    wildcardStart = new ArrayList<>();
+//                wildcardStart.add(cleanMatcher);
+//            }
+//            else
+//            {
+//                if (wildcardEnd == null)
+//                    wildcardEnd = new ArrayList<>();
+//                wildcardEnd.add(cleanMatcher);
+//            }
+//        }
+        if (wildcards == null)
+            wildcards = new ArrayList<>();
+        wildcards.add(wildcard);
+    }
+
+    @Override
+    public boolean matches(String text)
+    {
+        for (String wildcard : wildcards)
+        {
+            if(FilenameUtils.wildcardMatch(text, wildcard, IOCase.INSENSITIVE))
+                return true;
+        }
+//        if(wildcardContains != null)
+//        {
+//            for (String wildcard : wildcardContains)
+//            {
+//                if(text.contains(wildcard))
+//                    return true;
+//            }
+//        }
+//
+//        if(wildcardStart != null)
+//        {
+//            for (String wildcard : wildcardStart)
+//            {
+//                if(text.endsWith(wildcard))
+//                    return true;
+//            }
+//        }
+//
+//        if(wildcardEnd != null)
+//        {
+//            for (String wildcard : wildcardEnd)
+//            {
+//                if(text.startsWith(wildcard))
+//                    return true;
+//            }
+//        }
+
+        return false;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/IRule.java

@@ -0,0 +1,14 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import org.bukkit.inventory.ItemStack;
+
+public interface IRule
+{
+    boolean matches(ItemStack item);
+
+    default boolean matches(ChangeSession session)
+    {
+        return matches(session.item);
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleEdible.java

@@ -0,0 +1,22 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import org.bukkit.inventory.ItemStack;
+
+public class RuleEdible implements IRule
+{
+    private final boolean value;
+
+    public RuleEdible(boolean value)
+    {
+        this.value = value;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        if(value)
+            return item.getType().isEdible();
+        else
+            return !item.getType().isEdible();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleHardnessGraterThan.java

@@ -0,0 +1,20 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import dev.lone.vanillacustomizer.nms.items.ItemsNms;
+import org.bukkit.inventory.ItemStack;
+
+public class RuleHardnessGraterThan implements IRule
+{
+    private final double value;
+
+    public RuleHardnessGraterThan(double value)
+    {
+        this.value = value;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        return ItemsNms.nms().getDestroySpeed(item) > value;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleMaterial.java

@@ -0,0 +1,20 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+
+public class RuleMaterial implements IRule
+{
+    Material material;
+
+    public RuleMaterial(Material material)
+    {
+        this.material = material;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        return item.getType() == material;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleMaterialRegex.java

@@ -0,0 +1,22 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import dev.lone.vanillacustomizer.customization.matchers.RegexMatcher;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.List;
+
+public class RuleMaterialRegex implements IRule
+{
+    RegexMatcher matcher;
+
+    public RuleMaterialRegex(String regexStr)
+    {
+        matcher = new RegexMatcher(regexStr);
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        return matcher.matches(item.getType().toString());
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleMaterialWildcards.java

@@ -0,0 +1,44 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.io.IOCase;
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class RuleMaterialWildcards implements IRule
+{
+    List<Material> matches = new ArrayList<>();
+
+    public List<String> init(List<String> materialWildcards)
+    {
+        List<String> noMatches = new ArrayList<>();
+        for (String entry : materialWildcards)
+        {
+            boolean any = false;
+            for (Material material : Material.values())
+            {
+                if(FilenameUtils.wildcardMatch(material.toString(), entry, IOCase.INSENSITIVE))
+                {
+                    matches.add(material);
+                    any = true;
+                }
+            }
+
+            if(!any)
+            {
+                noMatches.add(entry);
+            }
+        }
+
+        return noMatches;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        return matches.contains(item.getType());
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleMaterials.java

@@ -0,0 +1,29 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.List;
+
+public class RuleMaterials implements IRule
+{
+    List<Material> materials;
+
+    public RuleMaterials(List<Material> materials)
+    {
+        this.materials = materials;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        Material type = item.getType();
+        for (Material entry : materials)
+        {
+            if(type == entry)
+                return true;
+        }
+
+        return false;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RulePlaceable.java

@@ -0,0 +1,19 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import org.bukkit.inventory.ItemStack;
+
+public class RulePlaceable implements IRule
+{
+    final boolean placeable;
+
+    public RulePlaceable(boolean placeable)
+    {
+        this.placeable = placeable;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        return item.getType().isBlock();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleRarity.java

@@ -0,0 +1,21 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import dev.lone.vanillacustomizer.nms.items.ItemsNms;
+import dev.lone.vanillacustomizer.nms.items.Rarity;
+import org.bukkit.inventory.ItemStack;
+
+public class RuleRarity implements IRule
+{
+    private Rarity rarity;
+
+    public RuleRarity(Rarity rarity)
+    {
+        this.rarity = rarity;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        return rarity.equals(ItemsNms.nms().getRarity(item));
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleSmelted.java

@@ -0,0 +1,23 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import dev.lone.vanillacustomizer.nms.items.ItemsNms;
+import org.bukkit.inventory.ItemStack;
+
+public class RuleSmelted implements IRule
+{
+    private final boolean value;
+
+    public RuleSmelted(boolean value)
+    {
+        this.value = value;
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        if(value)
+            return ItemsNms.inst().SMELTED_MATERIALS.contains(item.getType());
+        else
+            return !ItemsNms.inst().SMELTED_MATERIALS.contains(item.getType());
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/customization/rules/RuleVanillaItemMatcher.java

@@ -0,0 +1,54 @@
+package dev.lone.vanillacustomizer.customization.rules;
+
+import dev.lone.vanillacustomizer.ChangeSession;
+import dev.lone.vanillacustomizer.utils.Utilz;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+
+public class RuleVanillaItemMatcher implements IRule
+{
+    final boolean isVanilla;
+
+    public RuleVanillaItemMatcher(boolean isVanilla)
+    {
+        this.isVanilla = isVanilla;
+    }
+
+    public static boolean satisfy(ItemStack itemStack)
+    {
+        if(itemStack == null)
+            return false;
+
+        if(!itemStack.hasItemMeta())
+            return true;
+
+        ItemMeta meta = itemStack.getItemMeta();
+        if(meta == null)
+            return true;
+
+        // TODO: warning, items with no lore would still be considered vanilla while they might be custom.
+        //  might need to check NBT
+        if(meta.hasLore())
+        {
+            return false;
+        }
+
+        String displayName = meta.getDisplayName();
+        displayName = Utilz.backColor(displayName);
+
+        // Check if italic, means that might have been renamed using anvil.
+        return !displayName.startsWith("&o");
+    }
+
+    @Override
+    public boolean matches(ItemStack item)
+    {
+        return false;
+    }
+
+    @Override
+    public boolean matches(ChangeSession session)
+    {
+        return session.isVanilla;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/nms/Nms.java

@@ -0,0 +1,69 @@
+package dev.lone.vanillacustomizer.nms;
+
+import dev.lone.LoneLibs.annotations.Nullable;
+import dev.lone.LoneLibs.nbt.nbtapi.utils.MinecraftVersion;
+import dev.lone.vanillacustomizer.Main;
+import org.bukkit.Bukkit;
+
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Utility to initialize NMS wrappers and avoid Maven circular dependency problems.
+ */
+public class Nms
+{
+    public static boolean is_v18_2_or_greater;
+    public static boolean is_v19_2_or_greater;
+    public static boolean is_v17_or_greater;
+    public static boolean is_v1_16_or_greater;
+
+    static
+    {
+        is_v19_2_or_greater = MinecraftVersion.isAtLeastVersion(MinecraftVersion.MC1_19_R1);
+        is_v18_2_or_greater = MinecraftVersion.isAtLeastVersion(MinecraftVersion.MC1_18_R1);
+        is_v17_or_greater = MinecraftVersion.isAtLeastVersion(MinecraftVersion.MC1_17_R1);
+        is_v1_16_or_greater = MinecraftVersion.isAtLeastVersion(MinecraftVersion.MC1_16_R1);
+    }
+
+    /**
+     * Gets a suitable implementaion for the current Minecraft server version.
+     *
+     * @param implClazz   the interface class which every implementation implements.
+     * @param nmsHolder   the wrapper which holds NMS methods as Singleton utility.
+     * @param ignoreError If loading errors should be ignored, for example if no implementation exists. This is hacky but can
+     *                    be useful in some cases.
+     * @return the correct implementation.
+     */
+    @Nullable
+    @SuppressWarnings("unchecked")
+    public static <T> T findImplementation(Class<T> implClazz, Object nmsHolder, boolean ignoreError)
+    {
+        String nmsVersion = Bukkit.getServer().getClass().getPackage().getName().replace(".", ",").split(",")[3];
+
+        try
+        {
+            Class<?> implClass = Class.forName(nmsHolder.getClass().getPackage().getName() + ".impl." + nmsVersion);
+            try
+            {
+                //To fix a bug: For example implementations of IBlockInfo class have BlockInfo has first param of the constructor.
+                return (T) implClass.getDeclaredConstructor(nmsHolder.getClass()).newInstance(nmsHolder);
+            }
+            catch (NoSuchMethodException e)
+            {
+                return (T) implClass.getDeclaredConstructor().newInstance();
+            }
+        }
+        catch (ClassNotFoundException | InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e)
+        {
+            if (ignoreError)
+                return null;
+
+            Main.msg.error("Error getting implementation for " + nmsHolder.getClass() + " - NMS " + nmsVersion);
+            e.printStackTrace();
+
+            Bukkit.getPluginManager().disablePlugin(Main.inst());
+            Bukkit.shutdown();
+        }
+        return null;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/nms/items/IItemsNms.java

@@ -0,0 +1,14 @@
+package dev.lone.vanillacustomizer.nms.items;
+
+import org.bukkit.inventory.ItemStack;
+
+public interface IItemsNms
+{
+    Rarity getRarity(ItemStack bukkitItem);
+
+    float getDestroySpeed(ItemStack bukkitItem);
+
+    int getNutrition(ItemStack bukkitItem);
+
+    float getSaturation(ItemStack bukkitItem);
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/nms/items/ItemsNms.java

@@ -0,0 +1,46 @@
+package dev.lone.vanillacustomizer.nms.items;
+
+import dev.lone.vanillacustomizer.nms.Nms;
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.inventory.CookingRecipe;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ItemsNms
+{
+    public IItemsNms nms;
+    static ItemsNms instance;
+
+    public List<Material> SMELTED_MATERIALS = new ArrayList<>();
+
+    ItemsNms()
+    {
+        nms = Nms.findImplementation(IItemsNms.class, this, false);
+    }
+
+    public static ItemsNms inst()
+    {
+        if(instance == null)
+            instance = new ItemsNms();
+        return instance;
+    }
+
+    public static IItemsNms nms()
+    {
+        return inst().nms;
+    }
+
+    public void initialize()
+    {
+        Bukkit.recipeIterator().forEachRemaining(recipe -> {
+            if(recipe instanceof CookingRecipe)
+            {
+                Material type = recipe.getResult().getType();
+                if(!type.isEdible())
+                    SMELTED_MATERIALS.add(type);
+            }
+        });
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/nms/items/Rarity.java

@@ -0,0 +1,18 @@
+package dev.lone.vanillacustomizer.nms.items;
+
+import org.bukkit.Color;
+
+public enum Rarity
+{
+    COMMON(Color.WHITE),
+    UNCOMMON(Color.YELLOW),
+    RARE(Color.AQUA),
+    EPIC(Color.PURPLE);
+
+    public final Color color;
+
+    Rarity(Color var2)
+    {
+        this.color = var2;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/utils/ConfigFile.java

@@ -0,0 +1,539 @@
+package dev.lone.vanillacustomizer.utils;
+
+import dev.lone.LoneLibs.annotations.NotNull;
+import dev.lone.vanillacustomizer.Main;
+import dev.lone.vanillacustomizer.nms.Nms;
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.lang.Validate;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.Material;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.InvalidConfigurationException;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.EntityType;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.potion.PotionEffectType;
+import dev.lone.LoneLibs.annotations.Nullable;
+
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Consumer;
+import java.util.logging.Level;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * 2020-01-08 LoneDev
+ */
+public class ConfigFile
+{
+    private static final Pattern hexPattern = Pattern.compile("%#([A-Fa-f0-9]){6}%");
+
+    final Plugin plugin;
+
+    private FileConfiguration config;
+    private final String filePath;
+    private final File configFile;
+    private boolean hasDefaultFile = true;
+    private boolean autoAddMissingProperties = false;
+    private String partialFilePath;
+    private boolean announceCustomLanguage;
+
+    /**
+     * @param plugin                   Plugin
+     * @param filePath                 Partial path of the file (root = plugins/XXX/)
+     * @param hasDefaultFile           If there is a default file in .jar resources
+     * @param autoAddMissingProperties Add properties that are missing from user config (useful on plugin updates if you create new properties in the config)
+     */
+    public ConfigFile(Plugin plugin, boolean pluginsFolderRoot, String filePath, boolean hasDefaultFile, boolean autoAddMissingProperties)
+    {
+        this(plugin, pluginsFolderRoot, filePath, hasDefaultFile, autoAddMissingProperties, true);
+    }
+
+    public ConfigFile(Plugin plugin, boolean pluginsFolderRoot, String filePath, boolean hasDefaultFile, boolean autoAddMissingProperties, boolean announceCustomLanguage)
+    {
+        this.plugin = plugin;
+        this.announceCustomLanguage = announceCustomLanguage;
+
+        if (pluginsFolderRoot)
+        {
+            this.partialFilePath = filePath;
+            this.filePath = plugin.getDataFolder() + File.separator + filePath;
+            //this.filePath = "plugins/" + plugin.getName() + "/" + filePath;
+        }
+        else
+        {
+            this.partialFilePath = filePath.replace(plugin.getDataFolder().getAbsolutePath(), "");
+            this.filePath = filePath;
+        }
+
+        this.partialFilePath = this.partialFilePath.replace("\\", "/");
+
+        if (!new File(this.filePath).exists())
+            new File(this.filePath).getParentFile().mkdirs();
+
+        this.hasDefaultFile = hasDefaultFile;
+        this.autoAddMissingProperties = autoAddMissingProperties;
+        this.configFile = new File(this.filePath);
+
+        try
+        {
+            config = loadConfiguration(configFile);//seems to be the cause of lag on /iareload
+            initFile();
+        }
+        catch (IOException | InvalidConfigurationException e)
+        {
+            e.printStackTrace();
+        }
+    }
+
+    public ConfigFile(Plugin plugin, boolean pluginsFolderRoot, String filePath, boolean hasDefaultFile)
+    {
+        this(plugin, pluginsFolderRoot, filePath, hasDefaultFile, false);
+    }
+
+    @NotNull
+    public static YamlConfiguration loadConfiguration(@NotNull File file) throws IOException, InvalidConfigurationException
+    {
+        Validate.notNull(file, "File cannot be null");
+        YamlConfiguration config = new YamlConfiguration();
+
+        try
+        {
+            config.load(file);
+        }
+        catch (FileNotFoundException ignored)
+        {
+            // Happens the first time since the file obviously doesn't exist.
+        }
+        catch (IOException | InvalidConfigurationException exc)
+        {
+            Bukkit.getLogger().log(Level.SEVERE, "Cannot load file: " + file, exc);
+            throw exc;
+        }
+        return config;
+    }
+
+    private ConfigFile(Plugin plugin, String filePath)
+    {
+        this.plugin = plugin;
+        this.filePath = filePath;
+        this.configFile = new File(this.filePath);
+        config = YamlConfiguration.loadConfiguration(configFile);
+    }
+
+    public ConfigFile clone()
+    {
+        ConfigFile clone = new ConfigFile(plugin, filePath);
+        clone.partialFilePath = partialFilePath;
+        clone.hasDefaultFile = hasDefaultFile;
+        clone.autoAddMissingProperties = autoAddMissingProperties;
+        return clone;
+    }
+
+    public File getFile()
+    {
+        return configFile;
+    }
+
+    /**
+     * Reloads from file
+     */
+    public void reload()
+    {
+        config = YamlConfiguration.loadConfiguration(configFile);
+    }
+
+    /**
+     * Inits file taking it from original file in .jar if not exists and adding missing attributes if autoAddMissingProperties
+     */
+    public void initFile()
+    {
+        if (hasDefaultFile)
+        {
+            String resourceFilePath = this.filePath
+                    .replace("plugins/" + plugin.getName() + "/", "")
+                    .replace("plugins\\" + plugin.getName() + "\\", "")
+                    .replace("plugins\\" + plugin.getName() + "/", "");
+            try
+            {
+                if (!configFile.exists())
+                {
+                    // Load the default file from JAR resources
+                    FileUtils.copyInputStreamToFile(plugin.getResource(resourceFilePath), configFile);
+                }
+                else
+                {
+                    if (autoAddMissingProperties)
+                    {
+                        InputStream defaultFileStream = plugin.getResource(resourceFilePath);
+                        if(defaultFileStream != null)
+                        {
+                            FileConfiguration c = YamlConfiguration
+                                    .loadConfiguration((new InputStreamReader(defaultFileStream, StandardCharsets.UTF_8)));
+                            for (String k : c.getKeys(true))
+                            {
+                                if (!config.contains(k))
+                                    config.set(k, c.get(k));
+                            }
+                            config.save(configFile);
+                        }
+                    }
+                }
+                config.load(configFile);
+            }
+            catch (IOException | InvalidConfigurationException | NullPointerException e)
+            {
+                //e.printStackTrace();
+                //Main.msg.sendConsoleError("ERROR LOADING file '" + filePath + "'");
+                if (announceCustomLanguage)
+                    Main.msg.log(ChatColor.YELLOW + "Using custom language file '" + filePath + "'");
+                e.printStackTrace();
+            }
+        }
+    }
+
+    public FileConfiguration getConfigFile()
+    {
+        return config;
+    }
+
+    public String getFilePath()
+    {
+        return filePath;
+    }
+
+    public String getPartialFilePath()
+    {
+        return partialFilePath;
+    }
+
+    public static String convertColor(String string)
+    {
+        return convertColor0(string).replace("\\n", "\n");
+    }
+
+    private static String convertColor0(String message)
+    {
+        if (Nms.is_v1_16_or_greater)
+        {
+            Matcher matcher = hexPattern.matcher(message);
+            while (matcher.find())
+            {
+                final net.md_5.bungee.api.ChatColor hexColor = net.md_5.bungee.api.ChatColor.of(matcher.group().substring(1, matcher.group().length() - 1));
+                final String before = message.substring(0, matcher.start());
+                final String after = message.substring(matcher.end());
+                message = before + hexColor + after;
+                matcher = hexPattern.matcher(message);
+            }
+        }
+        return message.replace("&", "\u00A7");
+    }
+
+    protected void notifyMissingProperty(String path)
+    {
+        Main.msg.error("MISSING FILE PROPERTY! '" + path + "' in file '" + filePath + "'");
+    }
+
+    public void set(String path, Object value)
+    {
+        this.config.set(path, value);
+    }
+
+    public void save()
+    {
+        try
+        {
+            this.config.save(configFile);
+        }
+        catch (IOException e)
+        {
+            e.printStackTrace();
+        }
+    }
+
+    public void save(File newLocation)
+    {
+        try
+        {
+            this.config.save(newLocation);
+        }
+        catch (IOException e)
+        {
+            e.printStackTrace();
+        }
+    }
+
+    public boolean hasKey(String path)
+    {
+        return config.contains(path);
+    }
+
+    public void remove(String path)
+    {
+        config.set(path, null);
+    }
+
+    public List<String> getSectionKeysList(String path)
+    {
+        if (!hasKey(path))
+            return new ArrayList<>();
+        return new ArrayList<>(config.getConfigurationSection(path).getKeys(false));
+    }
+
+    public static List<String> getSectionKeysListBySection(ConfigurationSection section)
+    {
+        return getSectionKeysListBySection(section, "");
+    }
+
+    public static List<String> getSectionKeysListBySection(ConfigurationSection section, String path)
+    {
+        if (!section.contains(path))
+            return new ArrayList<>();
+        return new ArrayList<>(section.getKeys(false));
+    }
+
+    public Map<String, Object> getSectionKeysAndValues(String path)
+    {
+        if (!hasKey(path))
+            return null;
+        return config.getConfigurationSection(path).getValues(false);
+    }
+
+    public Object get(String path, Object defaultValue)
+    {
+        if (hasKey(path))
+            return config.get(path);
+        return defaultValue;
+    }
+
+    public String getString(String path)
+    {
+        return config.getString(path);
+    }
+
+    public String getString(String path, String defaultValue)
+    {
+        if (!hasKey(path))
+            return defaultValue;
+        return config.getString(path);
+    }
+
+    public int getInt(String path)
+    {
+        return config.getInt(path);
+    }
+
+    /**
+     * Riturna interno se trovato, se no ritorna defaultValue
+     *
+     * @param path
+     * @param defaultValue
+     * @return
+     */
+    public int getInt(String path, int defaultValue)
+    {
+        if (hasKey(path))
+            return config.getInt(path);
+        return defaultValue;
+    }
+
+    /**
+     * Ritorna double se trovato, se no ritorna defaultValue
+     *
+     * @param path
+     * @param defaultValue
+     * @return
+     */
+    public double getDouble(String path, double defaultValue)
+    {
+        if (hasKey(path))
+            return config.getDouble(path);
+        return defaultValue;
+    }
+
+    public float getFloat(String path, float defaultValue)
+    {
+        if (hasKey(path))
+            return (float) config.getDouble(path);
+        return defaultValue;
+    }
+
+    public float getFloat(String path)
+    {
+        return getFloat(path, 0f);
+    }
+
+    public boolean getBoolean(String path)
+    {
+        return config.getBoolean(path);
+    }
+
+    public boolean getBoolean(String path, boolean defaultValue)
+    {
+        if (hasKey(path))
+            return config.getBoolean(path);
+        return defaultValue;
+    }
+
+    public Material getMaterial(String path, Material defaultValue)
+    {
+        if (hasKey(path))
+            return EnumUtil.safeGet(config.getString(path).toUpperCase(), Material.class, defaultValue);
+        else
+            return defaultValue;
+    }
+
+    public static Material getMaterialByString(String value, Material defaultValue)
+    {
+        if(value == null)
+            return null;
+        return EnumUtil.safeGet(value.toUpperCase(), Material.class, defaultValue);
+    }
+
+    public Material getMaterial(String path)
+    {
+        return getMaterial(path, null);
+    }
+
+    public PotionEffectType getPotionEffectType(String path)
+    {
+        if (hasKey(path))
+            return PotionEffectType.getByName(config.getString(path));
+        else
+            return null;
+    }
+
+    @Nullable
+    public static PotionEffectType getPotionEffectTypeByString(String value)
+    {
+        return PotionEffectType.getByName(value);
+    }
+
+    public String getColored(String path)
+    {
+        return getColored(path, null);
+    }
+
+    public String getColored(String path, String defaultValue)
+    {
+        if (hasKey(path))
+        {
+            return convertColor(config.getString(path));
+        }
+        else
+        {
+            //notifyMissingProperty(path);
+            //return ChatColor.RED + "Error in file " + filePath;
+        }
+        return defaultValue;
+    }
+
+    public String getStripped(String name)
+    {
+        return ChatColor.stripColor(getColored(name));
+    }
+
+
+    public String getStrippedColors(String name)
+    {
+        return ChatColor.stripColor(getColored(name));
+    }
+
+    /**
+     * Returns a list of strings with colors already converted to bukkit format
+     */
+    public static List<String> getColored(List<String> list)
+    {
+        ArrayList<String> colored = new ArrayList<>();
+        for (String entry : list)
+            colored.add(convertColor(entry));
+        return colored;
+    }
+
+    /**
+     * Returns a list of strings with colors already converted to bukkit format
+     *
+     * @param path
+     * @param colored
+     * @return
+     */
+    public List<String> getStringList(String path, boolean colored)
+    {
+        if (colored)
+        {
+            ArrayList<String> coloredList = new ArrayList<>();
+            try
+            {
+                ArrayList<String> list = (ArrayList<String>) config.getStringList(path);
+                for (String entry : list)
+                    coloredList.add(convertColor(entry));
+            }
+            catch (NullPointerException exc)
+            {
+                exc.printStackTrace();
+                notifyMissingProperty(path);
+            }
+
+            return coloredList;
+        }
+        return config.getStringList(path);
+    }
+
+    /**
+     * Returns a list of strings (without converting colors)
+     *
+     * @param path
+     * @return
+     */
+    public List<String> getStringList(String path)
+    {
+        return getStringList(path, false);
+    }
+
+    public List<Material> getMaterialList(String path)
+    {
+        ArrayList<Material> coloredList = new ArrayList<>();
+
+        ArrayList<String> list = (ArrayList<String>) config.getStringList(path);
+        for (String material : list)
+        {
+            if (Material.valueOf(material.toUpperCase()) != null)//does this even work?
+                coloredList.add(Material.valueOf(material.toUpperCase()));
+            else
+                Main.msg.error("No material found with name " + material + ". Please check config '" + filePath + "'");
+        }
+
+        return coloredList;
+    }
+
+    @Nullable
+    public ConfigurationSection getConfigurationSection(@NotNull String path)
+    {
+        return config.getConfigurationSection(path);
+    }
+
+    @Nullable
+    public EntityType getEntityType(String key, EntityType armorStand, Consumer<String> failAction)
+    {
+        if (hasKey(key))
+        {
+            String val = getString(key).toUpperCase();
+            try
+            {
+                return EntityType.valueOf(val);
+            }
+            catch (Exception exc)
+            {
+                failAction.accept(val);
+                return null;
+            }
+        }
+        return armorStand;
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/utils/EnumUtil.java

@@ -0,0 +1,17 @@
+package dev.lone.vanillacustomizer.utils;
+
+public class EnumUtil
+{
+    public static <T extends Enum<T>> T safeGet(String str, Class<T> enumType, T fallback)
+    {
+        try
+        {
+            return Enum.valueOf(enumType, str);
+        }
+        catch (Exception e)
+        {
+            return fallback;
+        }
+    }
+
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/utils/Packets.java

@@ -0,0 +1,36 @@
+package dev.lone.vanillacustomizer.utils;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketEvent;
+import org.bukkit.plugin.Plugin;
+
+import java.util.function.Consumer;
+
+public class Packets
+{
+    /**
+     * Register Server->Client packet listener
+     */
+    public static void out(Plugin plugin, PacketType packetType, Consumer<PacketEvent> handle)
+    {
+        ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(
+                PacketAdapter.params()
+                        .plugin(plugin)
+                        .types(packetType)
+                        .listenerPriority(ListenerPriority.MONITOR)
+        )
+        {
+            @Override
+            public void onPacketSending(PacketEvent e)
+            {
+                if (e.isCancelled() || e.isPlayerTemporary())
+                    return;
+
+                handle.accept(e);
+            }
+        });
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/utils/SmallCaps.java

@@ -0,0 +1,24 @@
+package dev.lone.vanillacustomizer.utils;
+
+import dev.lone.LoneLibs.annotations.NotNull;
+
+public class SmallCaps
+{
+    private static final char[] CHARS = "ᴀʙᴄᴅᴇꜰɢʜɪᴊᴋʟᴍɴᴏᴘǫʀsᴛᴜᴠᴡxʏᴢ".toCharArray();
+
+    public static String apply(@NotNull String string)
+    {
+        final StringBuilder sb = new StringBuilder();
+        final char[] chars = string.toLowerCase().toCharArray();
+        for (char c : chars)
+        {
+            final int index = c - 'a';
+            if (index >= 0 && index < CHARS.length)
+                sb.append(CHARS[index]);
+            else
+                sb.append(c);
+        }
+
+        return sb.toString();
+    }
+}

VanillaCustomizer-core/src/main/java/dev/lone/vanillacustomizer/utils/Utilz.java

@@ -0,0 +1,599 @@
+package dev.lone.vanillacustomizer.utils;
+
+import dev.lone.LoneLibs.chat.Comp;
+import lonelibs.net.kyori.adventure.text.Component;
+import lonelibs.net.kyori.adventure.text.format.TextColor;
+import lonelibs.net.kyori.adventure.text.format.TextDecoration;
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.lang.reflect.FieldUtils;
+import org.bukkit.Bukkit;
+import org.bukkit.Color;
+import org.bukkit.Material;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.inventory.ItemStack;
+
+import java.io.File;
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.text.CharacterIterator;
+import java.text.DecimalFormat;
+import java.text.SimpleDateFormat;
+import java.text.StringCharacterIterator;
+import java.util.*;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+public class Utilz
+{
+    public static Random random = new Random();
+
+    private static final DecimalFormat DECIMAL_FORMAT = new DecimalFormat("##.00");
+    private static final Pattern PATTERN_HEX = Pattern.compile("%#([A-Fa-f0-9]){6}%");
+    private static final Pattern PATTERN_IS_NUMERIC = Pattern.compile("-?\\d+(\\.\\d+)?");
+
+    public static void removeEnchantments(ItemStack item)
+    {
+        item.getEnchantments().keySet().forEach(item::removeEnchantment);
+    }
+
+    public static String addSpace(String s)
+    {
+        return s.replace("-", " ");
+    }
+
+    public static float getRandom(String level)
+    {
+        if (level.contains("-"))
+        {
+            String[] spl = level.split("-");
+            return round(randomNumber(Float.parseFloat(spl[0]), Float.parseFloat(spl[1])), 2);
+        }
+        else return Integer.parseInt(level);
+    }
+
+    public static int getRandomInt(String level)
+    {
+        if (level.contains("-"))
+        {
+            String[] spl = level.split("-");
+            return getRandomInt(Integer.parseInt(spl[0]), Integer.parseInt(spl[1]));
+        }
+        else return Integer.parseInt(level);
+    }
+
+    public static float round(float d, int decimalPlace)
+    {
+        BigDecimal bd = new BigDecimal(Float.toString(d));
+        bd = bd.setScale(decimalPlace, BigDecimal.ROUND_HALF_UP);
+        return bd.floatValue();
+    }
+
+    public static String round(double value, int places, boolean showZeroes)
+    {
+        if (places < 0) throw new IllegalArgumentException();
+
+        BigDecimal bd = BigDecimal.valueOf(value);
+        bd = bd.setScale(places, RoundingMode.HALF_UP);
+
+        String result = bd.doubleValue() + "";
+        if (!showZeroes)
+            result = result
+                    .replace(".00", "")
+                    .replace(".0", "");
+        return result;
+    }
+
+    public static float randomNumber(float f, float g)
+    {
+        return random.nextFloat() * (g - f) + f;
+    }
+
+    /**
+     * Returns a 0 to 1 random double.
+     *
+     * @return A random double from 0 to 1.
+     */
+    public static double randomNumber()
+    {
+        return random.nextDouble();
+    }
+
+    /**
+     * Supports negative min
+     */
+    public static int getRandomInt(int min, int max)
+    {
+        if (max == min)
+            return max;
+        return random.nextInt((max - min) + 1) + min;
+    }
+
+    /**
+     * Supports negative min
+     */
+    public static int getRandomInt(Random random, int min, int max)
+    {
+        if (max == min)
+            return max;
+        return random.nextInt((max - min) + 1) + min;
+    }
+
+    public static boolean getSuccess(int percent)
+    {
+        int i = getRandomInt(1, 100);
+        return i <= percent;
+    }
+
+    public static boolean hasPermmision(Player p, String perm)
+    {
+        if (p.hasPermission(perm)) return true;
+        return p.isOp();
+    }
+
+    public static String backColor(String name)
+    {
+        return name.replace("\u00A7", "&");
+    }
+
+    public static boolean isColored(String str)
+    {
+        return str.contains("\u00A7([0-fk-or])") || str.contains("&([0-fk-or])");
+    }
+
+    /**
+     * @param strNum check if it is numeric
+     */
+    public static boolean isNumeric(String strNum)
+    {
+        if (strNum == null)
+            return false;
+        return PATTERN_IS_NUMERIC.matcher(strNum).matches();
+    }
+
+    private static java.awt.Color hex2Rgb(String colorStr)
+    {
+        try
+        {
+            return new java.awt.Color(
+                    Integer.valueOf(colorStr.substring(1, 3), 16),
+                    Integer.valueOf(colorStr.substring(3, 5), 16),
+                    Integer.valueOf(colorStr.substring(5, 7), 16)
+            );
+        }
+        catch (Throwable e)
+        {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public static Color hexToBukkitColor(String colorStr)
+    {
+        if (colorStr == null)
+            return null;
+        //fix java.lang.NumberFormatException: For input string: ".0"
+        if (colorStr.endsWith(".0"))
+            colorStr = colorStr.replace(".0", "");
+        colorStr = colorStr.replace(".", "");
+        //fix java.lang.StringIndexOutOfBoundsException: String index out of range: 7
+        while (colorStr.length() < 7)
+            colorStr = colorStr + "0";
+        if (!colorStr.startsWith("#"))
+            colorStr = "#" + colorStr;
+
+        java.awt.Color javaColor = hex2Rgb(colorStr);
+        return Color.fromRGB(javaColor.getRed(), javaColor.getGreen(), javaColor.getBlue());
+    }
+
+    public static String colorToHexString(int rgb)
+    {
+        java.awt.Color tmp = new java.awt.Color(rgb);
+        return colorToHexString(tmp.getRed(), tmp.getGreen(), tmp.getBlue());
+    }
+
+    public static String colorToHexString(Color color, boolean hashtagPrefix)
+    {
+        java.awt.Color tmp = new java.awt.Color(color.asRGB());
+        return colorToHexString(tmp.getRed(), tmp.getGreen(), tmp.getBlue(), hashtagPrefix);
+    }
+
+    public static String colorToHexString(int r, int g, int b)
+    {
+        return colorToHexString(r, g, b, true);
+    }
+
+    public static String colorToHexString(int r, int g, int b, boolean hashtagPrefix)
+    {
+        if (hashtagPrefix)
+            return String.format("#%02x%02x%02x", r, g, b);
+        return String.format("%02x%02x%02x", r, g, b);
+    }
+
+    public static Color bukkitColor(int rgb)
+    {
+        java.awt.Color tmp = new java.awt.Color(rgb);
+        return Color.fromRGB(tmp.getRed(), tmp.getGreen(), tmp.getBlue());
+    }
+
+    public static int ceilDivision(float a, float b)
+    {
+        return (int) Math.ceil(a / b);
+
+    }
+
+    public static int parseInt(String number, int defaultValue)
+    {
+        try
+        {
+            return Integer.parseInt(number);
+        }
+        catch (Throwable ignored){}
+        return defaultValue;
+    }
+
+    public static float parseFloat(String number, float defaultValue)
+    {
+        try
+        {
+            return Float.parseFloat(number);
+        }
+        catch (Throwable ignored){}
+        return defaultValue;
+    }
+
+    public static Color bukkitColorFromString(String potionColorStr)
+    {
+        try
+        {
+            return (Color) FieldUtils.readStaticField(Color.class, potionColorStr);
+        }
+        catch (Exception e)
+        {
+            try
+            {
+                if (!Utilz.isNumeric(potionColorStr))
+                {
+                    if (potionColorStr == null)
+                        return null;
+                    //fix java.lang.NumberFormatException: For input string: ".0"
+                    if (potionColorStr.endsWith(".0"))
+                        potionColorStr = potionColorStr.replace(".0", "");
+                    potionColorStr = potionColorStr.replace(".", "");
+                    //fix java.lang.StringIndexOutOfBoundsException: String index out of range: 7
+                    while (potionColorStr.length() < 7)
+                        potionColorStr = potionColorStr + "0";
+                    if (!potionColorStr.startsWith("#"))
+                        potionColorStr = "#" + potionColorStr;
+
+                    java.awt.Color javaColor = hex2Rgb(potionColorStr);
+                    return Color.fromRGB(javaColor.getRed(), javaColor.getGreen(), javaColor.getBlue());
+                }
+                else
+                {
+                    Color.fromBGR(Integer.parseInt(potionColorStr));
+                }
+            }
+            catch (Throwable ignored)
+            {
+            }
+        }
+        return null;
+    }
+
+    public static int bukkitColorFromString_integer(String potionColorStr)
+    {
+        try
+        {
+            return ((Color) FieldUtils.readStaticField(Color.class, potionColorStr)).asRGB();
+        }
+        catch (Exception e)
+        {
+            try
+            {
+                if (!Utilz.isNumeric(potionColorStr))
+                {
+                    if (potionColorStr == null)
+                        return -1;
+                    //fix java.lang.NumberFormatException: For input string: ".0"
+                    if (potionColorStr.endsWith(".0"))
+                        potionColorStr = potionColorStr.replace(".0", "");
+                    potionColorStr = potionColorStr.replace(".", "");
+                    //fix java.lang.StringIndexOutOfBoundsException: String index out of range: 7
+                    while (potionColorStr.length() < 7)
+                        potionColorStr = potionColorStr + "0";
+                    if (!potionColorStr.startsWith("#"))
+                        potionColorStr = "#" + potionColorStr;
+
+                    java.awt.Color javaColor = hex2Rgb(potionColorStr);
+                    return Color.fromRGB(javaColor.getRed(), javaColor.getGreen(), javaColor.getBlue()).asRGB();
+                }
+                else
+                {
+                    return Integer.parseInt(potionColorStr);
+                }
+            }
+            catch (Throwable ignored){}
+        }
+        return -1;
+    }
+
+    public static boolean isBetween(int number, int min, int max, boolean equals)
+    {
+        if (equals)
+            return number >= min && number <= max;
+        return number > min && number < max;
+    }
+
+    public static boolean isBetween(int number, int min, int max)
+    {
+        return isBetween(number, min, max, true);
+    }
+
+    public static String getDateNowFormatted()
+    {
+        return getDateFormatted(new Date());
+    }
+
+    public static String getDateFormatted(Date date)
+    {
+        return new SimpleDateFormat("yyyy-MM-dd_HH-mm").format(date);
+    }
+
+    public static void printFunctionCaller()
+    {
+        try
+        {
+            StackTraceElement[] stackTrace = new Throwable().fillInStackTrace().getStackTrace();
+            StringBuilder a = new StringBuilder();
+            for (int i = 1; i < stackTrace.length; i++)
+                a.append(stackTrace[i].getMethodName() + ":" + stackTrace[i].getLineNumber()).append("->");
+            System.out.println(a.toString());
+        }
+        catch (Throwable ignored)
+        {
+        }
+    }
+
+    public static void showBook(Player player, String json)
+    {
+        ItemStack book = new ItemStack(Material.WRITTEN_BOOK);
+        Bukkit.getUnsafe().modifyItemStack(book, json);
+        player.openBook(book);
+    }
+
+    public static int rgb(int r, int g, int b)
+    {
+        return new java.awt.Color(r, g, b, 255).getRGB();
+    }
+
+    public static boolean mkdirs(String path, boolean printErrors)
+    {
+        File file = new File(path);
+        if (file.exists())
+            return true;
+
+        try
+        {
+            Files.createDirectories(file.toPath());
+        }
+        catch (Throwable e)
+        {
+            if (printErrors)
+                e.printStackTrace();
+            return false;
+        }
+
+        return true;
+    }
+
+    public static <T, E> Set<T> getKeysByValue(Map<T, E> map, E value)
+    {
+        return map.entrySet()
+                .stream()
+                .filter(entry -> Objects.equals(entry.getValue(), value))
+                .map(Map.Entry::getKey)
+                .collect(Collectors.toSet());
+    }
+
+    /** See: {@link Utilz#partialFilePath(String)}. */
+    public static String partialFilePath(File file)
+    {
+        return partialFilePath(file.getAbsolutePath());
+    }
+
+    /**
+     * Input:
+     * "C:/Progetti/Minecraft/TestServer/1.19/plugins/ItemsAdder/contents/_iainternal/resourcepack/assets/_iainternal/textures/icons/icon_next_orange.png"
+     * "C:/Progetti/Minecraft/TestServer/blank_template/1.19.4/plugins/ModelEngine/resource pack/contents/prova/123/asd"
+     * Output:
+     * "contents/_iainternal/resourcepack/assets/_iainternal/textures/icons/icon_next_orange.png"
+     * "resource pack/contents/prova/123/asd"
+     */
+    public static String partialFilePath(String fileAbsolutePath)
+    {
+        if (fileAbsolutePath == null)
+            return null;
+
+        String finalPath = fileAbsolutePath.replace("\\", "/");
+
+        int indexOfPlugins = finalPath.indexOf("plugins/");
+        if(indexOfPlugins != -1)
+            finalPath = finalPath.substring(indexOfPlugins);
+
+        // Remove the plugins/XXX/ text
+        int indexOfSlash = finalPath.indexOf("/");
+        if(indexOfSlash != -1)
+            finalPath = finalPath.substring(indexOfSlash + 1);
+        indexOfSlash = finalPath.indexOf("/");
+        if(indexOfSlash != -1)
+            finalPath = finalPath.substring(indexOfSlash + 1);
+
+        return finalPath;
+    }
+
+    public static int getFilesCount(File dir)
+    {
+        String[] list = dir.list();
+        if (list == null)
+            return 0;
+        return list.length;
+    }
+
+    public static String getPathRelativeToServerRoot(File file)
+    {
+        String serveRootPath = Bukkit.getServer().getWorldContainer().getAbsolutePath();
+        if (serveRootPath.endsWith("."))
+            serveRootPath = serveRootPath.substring(0, serveRootPath.length() - 2);
+        File serverRootDir = new File(serveRootPath).getParentFile();
+        return file.getAbsolutePath().replace(serverRootDir.getAbsolutePath(), "");
+    }
+
+    public static Path path(String path)
+    {
+        return new File(path).toPath();
+    }
+
+    /**
+     * Very important, zip files must use / not \\ or Minecraft won't recognize files..
+     */
+    public static String sanitizePath(String str)
+    {
+        str = str.replace("\\", "/");
+        if (str.startsWith("/"))
+            str = str.substring(1);
+        return str;
+    }
+
+    public static String sanitizedPath(File file)
+    {
+        return sanitizePath(file.getAbsolutePath());
+    }
+
+    public static String removeStartsWith(String str, String starsWith)
+    {
+        if (str.startsWith(starsWith))
+            return str.substring(starsWith.length());
+        return str;
+    }
+
+    public static String removeEndsWith(String str, String endsWith)
+    {
+        return str.replaceFirst(endsWith + "$", "");
+    }
+
+    public static String getLastNormalizedPathEntry(String str)
+    {
+        return str.substring(str.lastIndexOf('/') + 1);
+    }
+
+    public static String cloneString(String str)
+    {
+        return new String(str.getBytes(StandardCharsets.UTF_8));
+    }
+
+    public static <T> T[] copy(T[] matrix)
+    {
+        return Arrays.copyOf(matrix, matrix.length);
+    }
+
+    public static String fileExtension(File file)
+    {
+        return FilenameUtils.getExtension(file.getAbsolutePath());
+    }
+
+    public static String fileName(File file, boolean extension)
+    {
+        if(extension)
+            return file.getName();
+        return FilenameUtils.getBaseName(file.getAbsolutePath());
+    }
+
+    public static String humanReadableByteCountSI(long bytes)
+    {
+        if (-1000 < bytes && bytes < 1000)
+        {
+            return bytes + " B";
+        }
+        CharacterIterator ci = new StringCharacterIterator("kMGTPE");
+        while (bytes <= -999_950 || bytes >= 999_950)
+        {
+            bytes /= 1000;
+            ci.next();
+        }
+        return String.format("%.1f %cB", bytes / 1000.0, ci.current());
+    }
+
+    public static int minMax(int value, int min, int max)
+    {
+        if(value < min)
+            return min;
+        return Math.min(value, max);
+    }
+
+    public static String substringBefore(String string, String before)
+    {
+        return string.substring(string.indexOf(before));
+    }
+
+    public static Attribute strToAttributeType(String attributeModifier)
+    {
+        attributeModifier = attributeModifier.replace("minecraft:", "");
+        return switch (attributeModifier)
+        {
+            case "generic.max_health" -> Attribute.GENERIC_MAX_HEALTH;
+            case "generic.follow_range" -> Attribute.GENERIC_FOLLOW_RANGE;
+            case "generic.knockback_resistance" -> Attribute.GENERIC_KNOCKBACK_RESISTANCE;
+            case "generic.movement_speed" -> Attribute.GENERIC_MOVEMENT_SPEED;
+            case "generic.flying_speed" -> Attribute.GENERIC_FLYING_SPEED;
+            case "generic.attack_damage" -> Attribute.GENERIC_ATTACK_DAMAGE;
+            case "generic.attack_knockback" -> // 1.16+
+                    Attribute.GENERIC_ATTACK_KNOCKBACK;
+            case "generic.attack_speed" -> Attribute.GENERIC_ATTACK_SPEED;
+            case "generic.armor" -> Attribute.GENERIC_ARMOR;
+            case "generic.armor_toughness" -> Attribute.GENERIC_ARMOR_TOUGHNESS;
+            case "generic.luck" -> Attribute.GENERIC_LUCK;
+            case "zombie.spawn_reinforcements" -> Attribute.ZOMBIE_SPAWN_REINFORCEMENTS;
+            case "horse.jump_strength" -> Attribute.HORSE_JUMP_STRENGTH;
+            default -> null;
+        };
+    }
+
+    public static EquipmentSlot strToVanillaEquipmentSlot(String str)
+    {
+        return switch (str.toLowerCase())
+        {
+            case "head" -> EquipmentSlot.HEAD;
+            case "chest" -> EquipmentSlot.CHEST;
+            case "legs" -> EquipmentSlot.LEGS;
+            case "feet" -> EquipmentSlot.FEET;
+            case "mainhand" -> EquipmentSlot.HAND;
+            case "offhand" -> EquipmentSlot.OFF_HAND;
+            default -> null;
+        };
+    }
+
+    public static List<String> fixJsonFormatting(List<String> linesJson)
+    {
+        for (int i = 0, linesJsonSize = linesJson.size(); i < linesJsonSize; i++)
+        {
+            String jsonLine = linesJson.get(i);
+            linesJson.set(i, fixJsonFormatting(jsonLine));
+        }
+
+        return linesJson;
+    }
+
+    public static String fixJsonFormatting(String jsonString)
+    {
+        Component component = Comp.jsonToComponent(jsonString);
+        component = component.colorIfAbsent(TextColor.color(255, 255, 255));
+        component = component.decorationIfAbsent(TextDecoration.ITALIC, TextDecoration.State.FALSE);
+        return Comp.componentToJson(component);
+    }
+}

VanillaCustomizer-core/src/main/resources/contents/example_settings/config.yml

@@ -0,0 +1,44 @@
+customizations:
+  custom1:
+    rules:
+      material_wildcards:
+        - "*_SWORD"
+    changes:
+      rename: "Amogus"
+  custom2:
+    rules:
+      material: STONE
+    changes:
+      rename: "CUSTOM RULE 2!!!!"
+  custom3:
+    rules:
+      materials:
+        - DIAMOND
+        - EMERALD
+    changes:
+      rename: "CUSTOM RULE 3!!!"
+  custom4:
+    rules:
+      materials:
+        - DIAMOND_CHESTPLATE
+        - EMERALD
+    changes:
+      rename: "CUSTOM RULE 4!!!"
+  custom5:
+    rules:
+      materials:
+        - IRON_INGOT
+    changes:
+      replace_word_display_name:
+        from: "test"
+        to: "changed_text!!!"
+  custom6:
+    rules:
+      nbt:
+        path: "itemsadder.id"
+        value: ruby
+        type: string
+    changes:
+      replace_word_display_name:
+        from: "Rub"
+        to: "FOUND NBT RULE!"

VanillaCustomizer-core/src/main/resources/plugin.yml

@@ -0,0 +1,9 @@
+name: VanillaCustomizer
+version: 0.2
+main: dev.lone.vanillacustomizer.Main
+api-version: 1.13
+commands:
+  vanillacustomizer:
+    description: Main admin plugin command
+    usage: /<command>
+    permission: "vanillacustomizer.admin"