Add max anvil cost config and EnchantCommand mixin

Introduces a configurable max anvil cost via the config and enforces it in AnvilScreenHandlerMixin. Adds EnchantCommandMixin to support custom enchantment levels in the /enchant command. Updates mod version to 1.10 and registers the new mixin in the mixins config.

src/main/java/com/kasetoatz/superenchants/config/Config.java

@@ -32,6 +32,7 @@ public class Config
     public static boolean NO_PRIOR_WORK_PENALTY = true;
     public static boolean ENABLE_CUSTOM_ENCHANT_LEVELS = true;
     public static boolean CUSTOM_LEVELS_IN_LOOT_TABLE = false;
+    public static int MAX_ANVIL_COST = -1;
 
     public static Map<Identifier, Integer> LEVELS = new HashMap<>(Map.ofEntries(
         Map.entry(Identifier.of("minecraft:unbreaking"), 5),
@@ -148,6 +149,10 @@ public class Config
             {
                 CUSTOM_LEVELS_IN_LOOT_TABLE = data.get("custom-levels-in-loot-table").getAsBoolean();
             }
+            if (data.has("max-anvil-cost"))
+            {
+                MAX_ANVIL_COST = data.get("max-anvil-cost").getAsInt();
+            }
             if (data.has("custom-levels"))
             {
                 JsonObject levels = data.get("custom-levels").getAsJsonObject();
@@ -182,6 +187,7 @@ public class Config
             data.addProperty("no-prior-work-penalty", NO_PRIOR_WORK_PENALTY);
             data.addProperty("enable-custom-enchant-levels", ENABLE_CUSTOM_ENCHANT_LEVELS);
             data.addProperty("custom-levels-in-loot-table", CUSTOM_LEVELS_IN_LOOT_TABLE);
+            data.addProperty("max-anvil-cost", MAX_ANVIL_COST);
             JsonObject levels = new JsonObject();
             LEVELS.forEach((id, level) -> levels.addProperty(id.toString(), level));
             data.add("custom-levels", levels);

src/main/java/com/kasetoatz/superenchants/mixin/AnvilScreenHandlerMixin.java

@@ -1,16 +1,59 @@
 package com.kasetoatz.superenchants.mixin;
 
 import net.minecraft.enchantment.Enchantment;
-import net.minecraft.screen.AnvilScreenHandler;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.screen.*;
 import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.Redirect;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
+import java.lang.reflect.Field;
+import java.util.List;
+
+import static com.kasetoatz.superenchants.config.Config.MAX_ANVIL_COST;
 import static com.kasetoatz.superenchants.util.Util.getCustomLevel;
 
 @Mixin(AnvilScreenHandler.class)
 public class AnvilScreenHandlerMixin
 {
+    @Unique private Field properties;
+    @Unique private Field syncHandler;
+
+    @Inject(method="<init>(ILnet/minecraft/entity/player/PlayerInventory;Lnet/minecraft/screen/ScreenHandlerContext;)V", at=@At("TAIL"))
+    public void init(int syncId, PlayerInventory inventory, ScreenHandlerContext context, CallbackInfo ci)
+    {
+        try
+        {
+            properties = ScreenHandler.class.getDeclaredField("properties");
+            properties.setAccessible(true);
+            syncHandler = ScreenHandler.class.getDeclaredField("syncHandler");
+            syncHandler.setAccessible(true);
+        }
+        catch (NoSuchFieldException ignored) {}
+    }
+
+    @Redirect(method="updateResult", at=@At(value="INVOKE", target="Lnet/minecraft/screen/Property;get()I"))
+    public int getLevel(Property levelCost)
+    {
+        if (MAX_ANVIL_COST > -1 && levelCost.get() > MAX_ANVIL_COST)
+        {
+            levelCost.set(MAX_ANVIL_COST);
+            try
+            {
+                @SuppressWarnings("unchecked")
+                int index = ((List<Property>)properties.get(this)).indexOf(levelCost);
+                @SuppressWarnings("DataFlowIssue")
+                AnvilScreenHandler handler = (AnvilScreenHandler)(Object)this;
+                ((ScreenHandlerSyncHandler)syncHandler.get(this)).updateProperty(handler, index, levelCost.get());
+            }
+            catch (IllegalAccessException ignored) {}
+        }
+        return levelCost.get();
+    }
+
     @Redirect(method="updateResult", at=@At(value="INVOKE", target="Lnet/minecraft/enchantment/Enchantment;getMaxLevel()I"))
     public int getMaxLevel(Enchantment enchant)
     {

src/main/java/com/kasetoatz/superenchants/mixin/EnchantCommandMixin.java

@@ -0,0 +1,20 @@
+package com.kasetoatz.superenchants.mixin;
+
+import net.minecraft.enchantment.Enchantment;
+import net.minecraft.server.command.EnchantCommand;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import static com.kasetoatz.superenchants.util.Util.getCustomLevel;
+
+@Mixin(EnchantCommand.class)
+public class EnchantCommandMixin
+{
+    @Redirect(method="execute", at= @At(value = "INVOKE", target = "Lnet/minecraft/enchantment/Enchantment;getMaxLevel()I"))
+    private static int execute(Enchantment enchant)
+    {
+        int custom = getCustomLevel(enchant);
+        return (custom > 0) ? custom : enchant.getMaxLevel();
+    }
+}