add executioner enchant and refactor how default config keys are saved

README.MD

@@ -22,6 +22,12 @@ Replants broken crops using seeds in your inventory or from the loot of the crop
 **Description**:
 Teleports dropped items to players location and makes them immediately pickuppable.
 
+### Executioner
+**Translation key**: `enchantio.enchantment.executioner`
+
+**Description**:
+Items enchanted with executioner will deal more damage to entities under specific health threshold.
+
 
 ## Configuration
 

src/main/java/me/youhavetrouble/enchantio/Enchantio.java

@@ -1,5 +1,10 @@
 package me.youhavetrouble.enchantio;
 
+import me.youhavetrouble.enchantio.enchants.ExecutionerEnchant;
+import me.youhavetrouble.enchantio.enchants.ReplantingEnchant;
+import me.youhavetrouble.enchantio.enchants.SoulboundEnchant;
+import me.youhavetrouble.enchantio.enchants.TelepathyEnchant;
+import me.youhavetrouble.enchantio.listeners.ExecutionerListener;
 import me.youhavetrouble.enchantio.listeners.ReplantingListener;
 import me.youhavetrouble.enchantio.listeners.SoulboundListener;
 import me.youhavetrouble.enchantio.listeners.TelepathyListener;
@@ -9,9 +14,18 @@ public final class Enchantio extends JavaPlugin {
 
     @Override
     public void onEnable() {
-        getServer().getPluginManager().registerEvents(new SoulboundListener(), this);
-        getServer().getPluginManager().registerEvents(new TelepathyListener(), this);
-        getServer().getPluginManager().registerEvents(new ReplantingListener(), this);
+        if (EnchantioConfig.ENCHANTS.containsKey(SoulboundEnchant.KEY)) {
+            getServer().getPluginManager().registerEvents(new SoulboundListener(), this);
+        }
+        if (EnchantioConfig.ENCHANTS.containsKey(TelepathyEnchant.KEY)) {
+            getServer().getPluginManager().registerEvents(new TelepathyListener(), this);
+        }
+        if (EnchantioConfig.ENCHANTS.containsKey(ReplantingEnchant.KEY)) {
+            getServer().getPluginManager().registerEvents(new ReplantingListener(), this);
+        }
+        if (EnchantioConfig.ENCHANTS.containsKey(ExecutionerEnchant.KEY)) {
+            getServer().getPluginManager().registerEvents(new ExecutionerListener(), this);
+        }
     }
 
     @Override

src/main/java/me/youhavetrouble/enchantio/EnchantioConfig.java

@@ -12,9 +12,7 @@ import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.inventory.ItemType;
 
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.InputStream;
 import java.nio.file.Path;
 import java.util.*;
 import java.util.logging.Logger;
@@ -34,46 +32,32 @@ public class EnchantioConfig {
         }
 
         File configFile = new File(filePath.toFile(), "config.yml");
-        if (!configFile.exists()) {
-            try (InputStream in = getClass().getResourceAsStream("/config.yml")) {
-                if (in == null) {
-                    throw new IOException("Failed to load config.yml from resources");
-                }
-                try (FileOutputStream out = new FileOutputStream(configFile)) {
-                    byte[] buffer = new byte[1024];
-                    int bytesRead;
-                    while ((bytesRead = in.read(buffer)) != -1) {
-                        out.write(buffer, 0, bytesRead);
-                    }
-                }
-            } catch (IOException e) {
-                throw new IOException("Failed saving default config", e);
-            }
-        }
+        configFile.createNewFile();
 
         FileConfiguration configuration = YamlConfiguration.loadConfiguration(configFile);
 
         ConfigurationSection enchantsSection = configuration.getConfigurationSection("enchants");
         if (enchantsSection == null) {
-            throw new IOException("Failed to load enchants section from config");
+            enchantsSection = configuration.createSection("enchants");
         }
 
         ConfigurationSection soulboundSection = enchantsSection.getConfigurationSection("soulbound");
         if (soulboundSection == null) {
             soulboundSection = enchantsSection.createSection("soulbound");
         }
-        ENCHANTS.put(SoulboundEnchant.KEY, new SoulboundEnchant(
-                soulboundSection.getInt("anvilCost", 1),
-                soulboundSection.getInt("weight", 10),
+
+        SoulboundEnchant soulboundEnchant = new SoulboundEnchant(
+                getInt(soulboundSection, "anvilCost", 1),
+                getInt(soulboundSection, "weight", 10),
                 EnchantmentRegistryEntry.EnchantmentCost.of(
-                        soulboundSection.getInt("minimumCost.base", 10),
-                        soulboundSection.getInt("minimumCost.additionalPerLevel", 1)
+                        getInt(soulboundSection, "minimumCost.base", 10),
+                        getInt(soulboundSection, "minimumCost.additionalPerLevel", 1)
                 ),
                 EnchantmentRegistryEntry.EnchantmentCost.of(
-                        soulboundSection.getInt("maximumCost.base", 65),
-                        soulboundSection.getInt("maximumCost.additionalPerLevel", 1)
+                        getInt(soulboundSection, "maximumCost.base", 65),
+                        getInt(soulboundSection, "maximumCost.additionalPerLevel", 1)
                 ),
-                soulboundSection.getBoolean("canGetFromEnchantingTable", true),
+                getBoolean(soulboundSection, "canGetFromEnchantingTable", true),
                 getTagsFromList(getStringList(
                         soulboundSection,
                         "supportedItemTags",
@@ -83,24 +67,29 @@ public class EnchantioConfig {
                                 "#minecraft:enchantable/mining"
                         )
                 ))
-        ));
+        );
+
+        if (getBoolean(soulboundSection, "enabled", true)) {
+            ENCHANTS.put(SoulboundEnchant.KEY, soulboundEnchant);
+        }
 
         ConfigurationSection telepathySection = enchantsSection.getConfigurationSection("telepathy");
         if (telepathySection == null) {
             telepathySection = enchantsSection.createSection("telepathy");
         }
-        ENCHANTS.put(TelepathyEnchant.KEY, new TelepathyEnchant(
-                telepathySection.getInt("anvilCost", 1),
-                telepathySection.getInt("weight", 5),
+
+        TelepathyEnchant telepathyEnchant = new TelepathyEnchant(
+                getInt(telepathySection,"anvilCost", 1),
+                getInt(telepathySection,"weight", 5),
                 EnchantmentRegistryEntry.EnchantmentCost.of(
-                        telepathySection.getInt("minimumCost.base", 15),
-                        telepathySection.getInt("minimumCost.additionalPerLevel", 1)
+                        getInt(telepathySection,"minimumCost.base", 15),
+                        getInt(telepathySection,"minimumCost.additionalPerLevel", 1)
                 ),
                 EnchantmentRegistryEntry.EnchantmentCost.of(
-                        telepathySection.getInt("maximumCost.base", 65),
-                        telepathySection.getInt("maximumCost.additionalPerLevel", 1)
+                        getInt(telepathySection,"maximumCost.base", 65),
+                        getInt(telepathySection,"maximumCost.additionalPerLevel", 1)
                 ),
-                telepathySection.getBoolean("canGetFromEnchantingTable", true),
+                getBoolean(telepathySection, "canGetFromEnchantingTable", true),
                 getTagsFromList(getStringList(
                         telepathySection,
                         "supportedItemTags",
@@ -108,24 +97,29 @@ public class EnchantioConfig {
                                 "#minecraft:enchantable/mining"
                         )
                 ))
-        ));
+        );
+
+        if (getBoolean(telepathySection, "enabled", true)) {
+            ENCHANTS.put(TelepathyEnchant.KEY, telepathyEnchant);
+        }
 
         ConfigurationSection replantingSection = enchantsSection.getConfigurationSection("replanting");
         if (replantingSection == null) {
             replantingSection = enchantsSection.createSection("replanting");
         }
-        ENCHANTS.put(ReplantingEnchant.KEY, new ReplantingEnchant(
-                replantingSection.getInt("anvilCost", 1),
-                replantingSection.getInt("weight", 10),
+
+        ReplantingEnchant replantingEnchant = new ReplantingEnchant(
+                getInt(replantingSection, "anvilCost", 1),
+                getInt(replantingSection, "weight", 10),
                 EnchantmentRegistryEntry.EnchantmentCost.of(
-                        replantingSection.getInt("minimumCost.base", 1),
-                        replantingSection.getInt("minimumCost.additionalPerLevel", 1)
+                        getInt(replantingSection, "minimumCost.base", 1),
+                        getInt(replantingSection, "minimumCost.additionalPerLevel", 1)
                 ),
                 EnchantmentRegistryEntry.EnchantmentCost.of(
-                        replantingSection.getInt("maximumCost.base", 65),
-                        replantingSection.getInt("maximumCost.additionalPerLevel", 1)
+                        getInt(replantingSection, "maximumCost.base", 65),
+                        getInt(replantingSection, "maximumCost.additionalPerLevel", 1)
                 ),
-                replantingSection.getBoolean("canGetFromEnchantingTable", true),
+                getBoolean(replantingSection, "canGetFromEnchantingTable", true),
                 getTagsFromList(getStringList(
                         replantingSection,
                         "supportedItemTags",
@@ -133,16 +127,84 @@ public class EnchantioConfig {
                                 "#minecraft:hoes"
                         )
                 ))
-        ));
+        );
 
+        if (getBoolean(replantingSection, "enabled", true)) {
+            ENCHANTS.put(ReplantingEnchant.KEY, replantingEnchant);
+        }
+
+        ConfigurationSection executionerSection = enchantsSection.getConfigurationSection("executioner");
+        if (executionerSection == null) {
+            executionerSection = enchantsSection.createSection("executioner");
+        }
+
+        ExecutionerEnchant executionerEnchant = new ExecutionerEnchant(
+                getInt(executionerSection, "anvilCost", 1),
+                getInt(executionerSection, "weight", 10),
+                EnchantmentRegistryEntry.EnchantmentCost.of(
+                        getInt(executionerSection, "minimumCost.base", 40),
+                        getInt(executionerSection, "minimumCost.additionalPerLevel", 3)
+                ),
+                EnchantmentRegistryEntry.EnchantmentCost.of(
+                        getInt(executionerSection, "maximumCost.base", 65),
+                        getInt(executionerSection,"maximumCost.additionalPerLevel", 1)
+                ),
+                getBoolean(executionerSection, "canGetFromEnchantingTable", true),
+                getTagsFromList(getStringList(
+                        executionerSection,
+                        "supportedItemTags",
+                        List.of(
+                                "#minecraft:enchantable/weapon"
+                        )
+                )),
+                getInt(executionerSection,"maxLevel", 5),
+                getDouble(executionerSection, "damageMultiplierPerLevel", 0.05),
+                getDouble(executionerSection, "maxDamageHpThreshold", 0.25)
+        );
+
+        if (getBoolean(executionerSection, "enabled", true)) {
+            ENCHANTS.put(ExecutionerEnchant.KEY, executionerEnchant);
+        }
+
+        configuration.save(configFile);
     }
 
     private List<String> getStringList(ConfigurationSection section, String key, List<String> defaultValue) {
         List<String> list = section.contains(key) ? section.getStringList(key) : null;
-        if (list == null) return defaultValue;
+        if (list == null) {
+            section.set(key, defaultValue);
+            return defaultValue;
+        }
         return list;
     }
 
+    private int getInt(ConfigurationSection section, String key, int defaultValue) {
+        int value = section.contains(key) ? section.getInt(key) : -1;
+        if (value == -1) {
+            section.set(key, defaultValue);
+            return defaultValue;
+        }
+        return value;
+    }
+
+    private double getDouble(ConfigurationSection section, String key, double defaultValue) {
+        double value = section.contains(key) ? section.getDouble(key) : -1;
+        if (value == -1) {
+            section.set(key, defaultValue);
+            return defaultValue;
+        }
+        return value;
+    }
+
+    private boolean getBoolean(ConfigurationSection section, String key, boolean defaultValue) {
+        boolean value = section.contains(key) && section.getBoolean(key);
+        if (!value) {
+            section.set(key, defaultValue);
+            return defaultValue;
+        }
+        return true;
+    }
+
     private Set<TagEntry<ItemType>> getTagsFromList(List<String> tags) {
         Set<TagEntry<ItemType>> supportedItemTags = new HashSet<>();
         for (String itemTag : tags) {

src/main/java/me/youhavetrouble/enchantio/enchants/ExecutionerEnchant.java

@@ -0,0 +1,112 @@
+package me.youhavetrouble.enchantio.enchants;
+
+import io.papermc.paper.registry.RegistryKey;
+import io.papermc.paper.registry.data.EnchantmentRegistryEntry;
+import io.papermc.paper.registry.tag.TagKey;
+import io.papermc.paper.tag.TagEntry;
+import net.kyori.adventure.key.Key;
+import net.kyori.adventure.text.Component;
+import org.bukkit.inventory.EquipmentSlotGroup;
+import org.bukkit.inventory.ItemType;
+
+import java.util.Set;
+
+@SuppressWarnings("UnstableApiUsage")
+public class ExecutionerEnchant implements EnchantioEnchant {
+
+    public static final Key KEY = Key.key("enchantio:executioner");
+
+    private final int anvilCost, weight, maxLevel;
+    private final EnchantmentRegistryEntry.EnchantmentCost minimumCost;
+    private final EnchantmentRegistryEntry.EnchantmentCost maximumCost;
+    private final boolean canGetFromEnchantingTable;
+    private final Set<TagEntry<ItemType>> supportedItemTags;
+    private final double damageMultiplierPerLevel, maxDamageHpThreshold;
+
+
+    public ExecutionerEnchant(
+            int anvilCost,
+            int weight,
+            EnchantmentRegistryEntry.EnchantmentCost minimumCost,
+            EnchantmentRegistryEntry.EnchantmentCost maximumCost,
+            boolean canGetFromEnchantingTable,
+            Set<TagEntry<ItemType>> supportedItemTags,
+            int maxLevel,
+            double damageMultiplierPerLevel,
+            double maxDamageHpThreshold
+    ) {
+        this.anvilCost = anvilCost;
+        this.weight = weight;
+        this.minimumCost = minimumCost;
+        this.maximumCost = maximumCost;
+        this.canGetFromEnchantingTable = canGetFromEnchantingTable;
+        this.supportedItemTags = supportedItemTags;
+        this.maxLevel = maxLevel;
+        this.damageMultiplierPerLevel = damageMultiplierPerLevel;
+        this.maxDamageHpThreshold = maxDamageHpThreshold;
+    }
+
+    @Override
+    public Key getKey() {
+        return KEY;
+    }
+
+    @Override
+    public Component getDescription() {
+        return Component.translatable("enchantio.enchant.executioner","Executioner");
+    }
+
+    @Override
+    public int getAnvilCost() {
+        return anvilCost;
+    }
+
+    @Override
+    public int getMaxLevel() {
+        return maxLevel;
+    }
+
+    public double getDamageMultiplierPerLevel() {
+        return damageMultiplierPerLevel;
+    }
+
+    public double getMaxDamageHpThreshold() {
+        return maxDamageHpThreshold;
+    }
+
+    @Override
+    public int getWeight() {
+        return weight;
+    }
+
+    @Override
+    public EnchantmentRegistryEntry.EnchantmentCost getMinimumCost() {
+        return minimumCost;
+    }
+
+    @Override
+    public EnchantmentRegistryEntry.EnchantmentCost getMaximumCost() {
+        return maximumCost;
+    }
+
+    @Override
+    public Iterable<EquipmentSlotGroup> getActiveSlots() {
+        return Set.of(EquipmentSlotGroup.HAND);
+    }
+
+    @Override
+    public boolean canGetFromEnchantingTable() {
+        return canGetFromEnchantingTable;
+    }
+
+    @Override
+    public TagKey<ItemType> getTagForSupportedItems() {
+        return TagKey.create(RegistryKey.ITEM, Key.key("enchantio:executioner_enchantable"));
+    }
+
+    @Override
+    public Set<TagEntry<ItemType>> getSupportedItems() {
+        return supportedItemTags;
+    }
+
+}

src/main/java/me/youhavetrouble/enchantio/listeners/ExecutionerListener.java

@@ -0,0 +1,60 @@
+package me.youhavetrouble.enchantio.listeners;
+
+import io.papermc.paper.registry.RegistryAccess;
+import io.papermc.paper.registry.RegistryKey;
+import me.youhavetrouble.enchantio.EnchantioConfig;
+import me.youhavetrouble.enchantio.enchants.EnchantioEnchant;
+import me.youhavetrouble.enchantio.enchants.ExecutionerEnchant;
+import org.bukkit.Registry;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeInstance;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.inventory.EntityEquipment;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.ItemStack;
+
+
+@SuppressWarnings("UnstableApiUsage")
+public class ExecutionerListener implements Listener {
+
+    private final Registry<Enchantment> registry = RegistryAccess.registryAccess().getRegistry(RegistryKey.ENCHANTMENT);
+    private final Enchantment executioner = registry.get(ExecutionerEnchant.KEY);
+
+    @EventHandler(ignoreCancelled = true, priority = EventPriority.NORMAL)
+    public void onExecutionerDamage(EntityDamageByEntityEvent event) {
+        if (executioner == null) return;
+        EnchantioEnchant enchant = EnchantioConfig.ENCHANTS.get(ExecutionerEnchant.KEY);
+        if (!(enchant instanceof ExecutionerEnchant executionerEnchant)) return;
+        Entity damager = event.getDamageSource().getCausingEntity();
+        if (damager == null) return;
+        if (!damager.equals(event.getDamageSource().getDirectEntity())) return;
+        if (!(damager instanceof InventoryHolder inventoryHolder)) return;
+        if (!(inventoryHolder.getInventory() instanceof EntityEquipment entityEquipment)) return;
+
+        ItemStack attackingItem = entityEquipment.getItemInMainHand();
+
+        if (!attackingItem.containsEnchantment(executioner)) return;
+
+        Entity target = event.getEntity();
+        if (!(target instanceof LivingEntity livingEntity)) return;
+
+        AttributeInstance maxHealthAttribute = livingEntity.getAttribute(Attribute.GENERIC_MAX_HEALTH);
+        if (maxHealthAttribute == null) return;
+        double targetMaxHealth = maxHealthAttribute.getValue();
+
+        double targetHealthPercentage = livingEntity.getHealth() / targetMaxHealth;
+
+        if (targetHealthPercentage < executionerEnchant.getMaxDamageHpThreshold()) {
+            double damageMultiplier = 1 + (executionerEnchant.getDamageMultiplierPerLevel() * attackingItem.getEnchantmentLevel(executioner));
+            event.setDamage(event.getDamage() * damageMultiplier);
+        }
+
+    }
+
+}

src/main/resources/config.yml

@@ -1,42 +0,0 @@
-enchants:
-  soulbound:
-    enabled: true
-    canGetFromEnchantingTable: true
-    anvilCost: 1
-    weight: 10
-    minimumCost:
-      base: 10
-      additionalPerLevel: 1
-    maximumCost:
-      base: 65
-      additionalPerLevel: 1
-    supportedItemTags:
-      - "#minecraft:enchantable/armor"
-      - "#minecraft:enchantable/weapon"
-      - "#minecraft:enchantable/mining"
-  telepathy:
-    enabled: true
-    canGetFromEnchantingTable: true
-    anvilCost: 1
-    weight: 5
-    minimumCost:
-      base: 15
-      additionalPerLevel: 1
-    maximumCost:
-      base: 65
-      additionalPerLevel: 1
-    supportedItemTags:
-      - "#minecraft:enchantable/mining"
-  replanting:
-    enabled: true
-    canGetFromEnchantingTable: true
-    anvilCost: 1
-    weight: 10
-    minimumCost:
-      base: 1
-      additionalPerLevel: 1
-    maximumCost:
-      base: 65
-      additionalPerLevel: 1
-    supportedItemTags:
-      - "#minecraft:hoes"