Added a new ImbuementActivateEvent to allow addons hooking into the imbuement process

src/main/java/electroblob/wizardry/event/ImbuementActivateEvent.java

@@ -0,0 +1,56 @@
+package electroblob.wizardry.event;
+
+import electroblob.wizardry.constants.Element;
+import electroblob.wizardry.tileentity.TileEntityImbuementAltar;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.fml.common.eventhandler.Cancelable;
+import net.minecraftforge.fml.common.eventhandler.Event;
+
+/**
+ * ImbuementActivateEvent is fired when {@link TileEntityImbuementAltar#getImbuementResult(net.minecraft.item.ItemStack, electroblob.wizardry.constants.Element[],
+ * boolean, net.minecraft.world.World, net.minecraft.entity.player.EntityPlayer)} is called to allow adding in imbuement "recipes" dynamically, based on the
+ * contents of the Imbuement altar's receptacles and the item placed on the altar.
+ *
+ * <i>Note that this event is only fired on the server side.</i><br>
+ * <br>
+ * To alter the result of the imbuement process, change the {@link electroblob.wizardry.event.ImbuementActivateEvent#result} result of the process.<br>
+ * <br>
+ * This event is {@link Cancelable}. If this event is canceled, no further processing takes place.<br>
+ * <br>
+ * This event does not have a result. {@link Event.HasResult}<br>
+ * <br>
+ * This event is fired on the {@link MinecraftForge#EVENT_BUS}.
+ *
+ * @author WinDanesz
+ * @since Wizardry 4.3.5
+ */
+@Cancelable
+public class ImbuementActivateEvent extends Event {
+
+	/** The item stack being imbued */
+	ItemStack input;
+
+	/** The elements of the four receptacles */
+	Element[] receptacleElements;
+
+	/** A reference to the current world object (may be null if {@code fullLootGen} is false) */
+	World world;
+
+	/** The player that last interacted with the imbuement altar, or null if there isn't one (or if this is being queried for other reasons, e.g. JEI) */
+	EntityPlayer lastUser;
+
+	/** The resulting item stack of the imbuement process */
+	ItemStack result;
+
+	public ImbuementActivateEvent(ItemStack input, Element[] receptacleElements, World world, EntityPlayer lastUser, ItemStack result) {
+		super();
+		this.input = input;
+		this.receptacleElements = receptacleElements;
+		this.world = world;
+		this.lastUser = lastUser;
+		this.result = result;
+	}
+}

src/main/java/electroblob/wizardry/tileentity/TileEntityImbuementAltar.java

@@ -2,6 +2,7 @@ package electroblob.wizardry.tileentity;
 
 import electroblob.wizardry.block.BlockReceptacle;
 import electroblob.wizardry.constants.Element;
+import electroblob.wizardry.event.ImbuementActivateEvent;
 import electroblob.wizardry.item.IManaStoringItem;
 import electroblob.wizardry.item.ItemWizardArmour;
 import electroblob.wizardry.registry.*;
@@ -24,6 +25,7 @@ import net.minecraft.world.World;
 import net.minecraft.world.WorldServer;
 import net.minecraft.world.storage.loot.LootContext;
 import net.minecraft.world.storage.loot.LootTable;
+import net.minecraftforge.common.MinecraftForge;
 import org.apache.commons.lang3.ArrayUtils;
 
 import javax.annotation.Nullable;
@@ -233,6 +235,14 @@ public class TileEntityImbuementAltar extends TileEntity implements ITickable {
 	 */
 	public static ItemStack getImbuementResult(ItemStack input, Element[] receptacleElements, boolean fullLootGen, World world, EntityPlayer lastUser){
 
+		ItemStack eventResult = ItemStack.EMPTY;
+
+		if (world != null && MinecraftForge.EVENT_BUS.post(new ImbuementActivateEvent(input, receptacleElements, world, lastUser, eventResult))) {
+			// return the stack if something changes the result from an empty stack.
+			//noinspection ConstantConditions
+			if (eventResult != ItemStack.EMPTY) return eventResult;
+		}
+
 		if(input.getItem() instanceof ItemWizardArmour && ((ItemWizardArmour)input.getItem()).element == null){
 
 			if(Arrays.stream(receptacleElements).distinct().count() == 1 && receptacleElements[0] != null){ // All the same element