feat: Added preventBindingSameSpellTwiceToWands setting (disabled by default). Controls whether to prevent binding the same spell to a wand multiple times

src/main/java/electroblob/wizardry/Settings.java

@@ -203,6 +203,8 @@ public final class Settings {
 	public boolean damageTypePerElement = false;
 	/** <b>[Server-only]</b> Whether spell books are consumed when they are bound to a wand.*/
 	public boolean singleUseSpellBooks = false;
+	/** <b>[Server-only]</b> Whether to prevent binding the same spell to a wand multiple times*/
+	public boolean preventBindingSameSpellTwiceToWands = false;
 	/** <b>[Server-only]</b> Whether to revert to the old wand upgrade system, which only requires tomes of arcana. */
 	public boolean legacyWandLevelling = false;
 	/** <b>[Server-only]</b> Whether to tweak the blindness effect to reduce follow distance when used on non-players. */
@@ -646,6 +648,13 @@ public final class Settings {
 		singleUseSpellBooks = property.getBoolean();
 		propOrder.add(property.getName());
 
+		property = config.get(GAMEPLAY_CATEGORY, "preventBindingSameSpellTwiceToWands", false,
+				"Whether to prevent binding the same spell to a wand multiple times");
+		property.setLanguageKey("config." + Wizardry.MODID + ".prevent_binding_same_spell_twice_to_wands");
+		Wizardry.proxy.setToNamedBooleanEntry(property);
+		preventBindingSameSpellTwiceToWands = property.getBoolean();
+		propOrder.add(property.getName());
+
 		property = config.get(GAMEPLAY_CATEGORY, "playersMoveEachOther", true,
 				"Whether to allow players to move other players around using magic.");
 		property.setLanguageKey("config." + Wizardry.MODID + ".players_move_each_other");

src/main/java/electroblob/wizardry/item/ItemWand.java

@@ -46,6 +46,7 @@ import net.minecraftforge.fml.relauncher.Side;
 import net.minecraftforge.fml.relauncher.SideOnly;
 
 import javax.annotation.Nullable;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Random;
 
@@ -843,8 +844,16 @@ public class ItemWand extends Item implements IWorkbenchItem, ISpellCastingItem,
 				Spell spell = Spell.byMetadata(spellBooks[i].getStack().getItemDamage());
 				// If the wand is powerful enough for the spell, it's not already bound to that slot and it's enabled for wands
 				if(!(spell.getTier().level > this.tier.level) && spells[i] != spell && spell.isEnabled(SpellProperties.Context.WANDS)){
+
+					// Decide if we can bind this multiple times
+					if (Wizardry.settings.preventBindingSameSpellTwiceToWands && Arrays.stream(spells).anyMatch(s -> s == spell)) {
+						continue;
+					}
+
 					spells[i] = spell;
 					changed = true;
+
+					// setting to consume books upon use
 					if (Wizardry.settings.singleUseSpellBooks) {
 						spellBooks[i].getStack().shrink(1);
 					}