More cleanup and refactoring

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/crafting/SpellCraftingRecipe.java

@@ -5,7 +5,7 @@ import java.util.List;
 import com.google.gson.JsonObject;
 import com.minelittlepony.unicopia.ability.magic.spell.effect.SpellType;
 import com.minelittlepony.unicopia.ability.magic.spell.trait.SpellTraits;
-import com.minelittlepony.unicopia.container.SpellbookScreenHandler.SpellbookInventory;
+import com.minelittlepony.unicopia.container.inventory.SpellbookInventory;
 import com.minelittlepony.unicopia.item.GemstoneItem;
 import com.minelittlepony.unicopia.item.URecipes;
 

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/crafting/SpellDuplicatingRecipe.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.ability.magic.spell.crafting;
 
 import com.google.gson.JsonObject;
 import com.minelittlepony.unicopia.ability.magic.spell.effect.SpellType;
-import com.minelittlepony.unicopia.container.SpellbookScreenHandler.SpellbookInventory;
+import com.minelittlepony.unicopia.container.inventory.SpellbookInventory;
 import com.minelittlepony.unicopia.item.*;
 import com.minelittlepony.unicopia.util.InventoryUtil;
 

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/crafting/SpellEnhancingRecipe.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.ability.magic.spell.crafting;
 
 import com.google.gson.JsonObject;
 import com.minelittlepony.unicopia.ability.magic.spell.trait.SpellTraits;
-import com.minelittlepony.unicopia.container.SpellbookScreenHandler.SpellbookInventory;
+import com.minelittlepony.unicopia.container.inventory.SpellbookInventory;
 import com.minelittlepony.unicopia.item.*;
 
 import net.minecraft.item.ItemStack;

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/crafting/SpellbookRecipe.java

@@ -3,7 +3,7 @@ package com.minelittlepony.unicopia.ability.magic.spell.crafting;
 import java.util.List;
 
 import com.minelittlepony.unicopia.ability.magic.spell.trait.Trait;
-import com.minelittlepony.unicopia.container.SpellbookScreenHandler.SpellbookInventory;
+import com.minelittlepony.unicopia.container.inventory.SpellbookInventory;
 import com.minelittlepony.unicopia.item.UItems;
 import com.minelittlepony.unicopia.item.URecipes;
 

src/main/java/com/minelittlepony/unicopia/client/gui/spellbook/SpellbookCraftingPageContent.java

@@ -5,7 +5,6 @@ import com.minelittlepony.common.client.gui.ScrollContainer;
 import com.minelittlepony.common.client.gui.element.Label;
 import com.minelittlepony.unicopia.ability.magic.spell.crafting.SpellbookRecipe;
 import com.minelittlepony.unicopia.client.gui.DrawableUtil;
-import com.minelittlepony.unicopia.container.SpellbookPage;
 import com.minelittlepony.unicopia.container.SpellbookState;
 import com.minelittlepony.unicopia.item.URecipes;
 import com.mojang.blaze3d.systems.RenderSystem;
@@ -15,6 +14,10 @@ import net.minecraft.text.Text;
 import net.minecraft.util.Identifier;
 
 public class SpellbookCraftingPageContent extends ScrollContainer implements SpellbookChapterList.Content, SpellbookScreen.RecipesChangedListener {
+    public static final Text INVENTORY_TITLE = Text.translatable("gui.unicopia.spellbook.page.inventory");
+    public static final Text RECIPES_TITLE = Text.translatable("gui.unicopia.spellbook.page.recipes");
+    public static final int TOTAL_PAGES = 2;
+
     private final SpellbookScreen screen;
 
     private SpellbookState.PageState state = new SpellbookState.PageState();
@@ -29,7 +32,7 @@ public class SpellbookCraftingPageContent extends ScrollContainer implements Spe
     public void init(SpellbookScreen screen, Identifier pageId) {
         state = screen.getState().getState(pageId);
         screen.addPageButtons(187, 300, 350, incr -> {
-            state.swap(incr, SpellbookPage.VALUES.length);
+            state.swap(incr, TOTAL_PAGES);
         });
         initContents();
         screen.addDrawable(this);
@@ -41,9 +44,9 @@ public class SpellbookCraftingPageContent extends ScrollContainer implements Spe
 
         int headerColor = mouseY % 255;
 
-        DrawableUtil.drawScaledText(matrices, SpellbookPage.VALUES[state.getOffset()].getLabel(), screen.getFrameBounds().left + screen.getFrameBounds().width / 2 + 20, SpellbookScreen.TITLE_Y, 1.3F, headerColor);
+        DrawableUtil.drawScaledText(matrices, state.getOffset() == 0 ? INVENTORY_TITLE : RECIPES_TITLE, screen.getFrameBounds().left + screen.getFrameBounds().width / 2 + 20, SpellbookScreen.TITLE_Y, 1.3F, headerColor);
 
-        Text pageText = Text.translatable("%s/%s", state.getOffset() + 1, SpellbookPage.VALUES.length);
+        Text pageText = Text.translatable("%s/%s", state.getOffset() + 1, TOTAL_PAGES);
         textRenderer.draw(matrices, pageText, 337 - textRenderer.getWidth(pageText) / 2F, 190, headerColor);
     }
 
@@ -58,18 +61,14 @@ public class SpellbookCraftingPageContent extends ScrollContainer implements Spe
 
     @Override
     public boolean showInventory() {
-        return SpellbookPage.VALUES[state.getOffset()] == SpellbookPage.INVENTORY;
+        return state.getOffset() == 0;
     }
 
     private void initPageContent() {
         getContentPadding().setVertical(10);
         getContentPadding().bottom = 30;
 
-        switch (SpellbookPage.VALUES[state.getOffset()]) {
+        if (state.getOffset() == 1) {
-            case INVENTORY:
-                // handled elsewhere
-                break;
-            case RECIPES:
             int top = 0;
             for (SpellbookRecipe recipe : this.client.world.getRecipeManager().listAllOfType(URecipes.SPELLBOOK)) {
                 if (client.player.getRecipeBook().contains(recipe)) {

src/main/java/com/minelittlepony/unicopia/client/gui/spellbook/SpellbookProfilePageContent.java

@@ -4,7 +4,6 @@ import com.minelittlepony.common.client.gui.IViewRoot;
 import com.minelittlepony.common.client.gui.dimension.Bounds;
 import com.minelittlepony.unicopia.Unicopia;
 import com.minelittlepony.unicopia.client.gui.DrawableUtil;
-import com.minelittlepony.unicopia.container.SpellbookPage;
 import com.minelittlepony.unicopia.entity.player.*;
 import com.mojang.blaze3d.systems.RenderSystem;
 
@@ -54,7 +53,7 @@ public class SpellbookProfilePageContent extends DrawableHelper implements Spell
         matrices.push();
         matrices.translate(screen.getBackgroundWidth() / 2 + SpellbookScreen.TITLE_X - 10, y, 0);
         matrices.scale(1.3F, 1.3F, 1);
-        font.draw(matrices, SpellbookPage.INVENTORY.getLabel(), 0, 0, SpellbookScreen.TITLE_COLOR);
+        font.draw(matrices, SpellbookCraftingPageContent.INVENTORY_TITLE, 0, 0, SpellbookScreen.TITLE_COLOR);
         matrices.pop();
 
         Bounds bounds = screen.getFrameBounds();

src/main/java/com/minelittlepony/unicopia/client/gui/spellbook/SpellbookScreen.java

@@ -11,7 +11,7 @@ import com.minelittlepony.common.client.gui.sprite.TextureSprite;
 import com.minelittlepony.unicopia.Unicopia;
 import com.minelittlepony.unicopia.client.gui.spellbook.SpellbookChapterList.*;
 import com.minelittlepony.unicopia.container.*;
-import com.minelittlepony.unicopia.container.SpellbookScreenHandler.*;
+import com.minelittlepony.unicopia.container.inventory.*;
 import com.minelittlepony.unicopia.network.Channel;
 import com.minelittlepony.unicopia.network.MsgSpellbookStateChanged;
 import com.mojang.blaze3d.platform.GlStateManager;

src/main/java/com/minelittlepony/unicopia/container/SpellbookPage.java

@@ -1,16 +0,0 @@
-package com.minelittlepony.unicopia.container;
-
-import net.minecraft.text.Text;
-
-public enum SpellbookPage {
-    INVENTORY,
-    RECIPES;
-
-    public static final SpellbookPage[] VALUES = values();
-
-    private final Text label = Text.translatable("gui.unicopia.spellbook.page." + name().toLowerCase());
-
-    public Text getLabel() {
-        return label;
-    }
-}

src/main/java/com/minelittlepony/unicopia/container/SpellbookScreenHandler.java

@@ -6,14 +6,10 @@ import java.util.function.Predicate;
 import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.EquinePredicates;
-import com.minelittlepony.unicopia.USounds;
 import com.minelittlepony.unicopia.ability.magic.spell.crafting.SpellbookRecipe;
-import com.minelittlepony.unicopia.ability.magic.spell.trait.SpellTraits;
+import com.minelittlepony.unicopia.container.inventory.*;
-import com.minelittlepony.unicopia.client.sound.BufferedExecutor;
-import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.item.UItems;
 import com.minelittlepony.unicopia.item.URecipes;
-import com.minelittlepony.unicopia.util.InventoryUtil;
 import com.mojang.datafixers.util.Pair;
 
 import net.minecraft.enchantment.EnchantmentHelper;
@@ -21,7 +17,6 @@ import net.minecraft.entity.EquipmentSlot;
 import net.minecraft.entity.mob.MobEntity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.entity.player.PlayerInventory;
-import net.minecraft.inventory.CraftingInventory;
 import net.minecraft.inventory.CraftingResultInventory;
 import net.minecraft.inventory.Inventory;
 import net.minecraft.item.ItemStack;
@@ -30,10 +25,8 @@ import net.minecraft.network.packet.s2c.play.ScreenHandlerSlotUpdateS2CPacket;
 import net.minecraft.screen.PlayerScreenHandler;
 import net.minecraft.screen.ScreenHandler;
 import net.minecraft.screen.ScreenHandlerContext;
-import net.minecraft.screen.slot.CraftingResultSlot;
 import net.minecraft.screen.slot.Slot;
 import net.minecraft.server.network.ServerPlayerEntity;
-import net.minecraft.sound.SoundCategory;
 import net.minecraft.util.Identifier;
 
 public class SpellbookScreenHandler extends ScreenHandler {
@@ -46,21 +39,21 @@ public class SpellbookScreenHandler extends ScreenHandler {
 
     private final int MAX_INGREDIENTS;
 
-    private final int GEM_SLOT_INDEX;
+    public final int GEM_SLOT_INDEX;
     private final int HOTBAR_START;
     private final int HOTBAR_END;
 
     private final SpellbookInventory input;
 
-    private InputSlot gemSlot;
+    public InputSlot gemSlot;
-    private ResultSlot outputSlot;
+    public OutputSlot outputSlot;
     private final CraftingResultInventory result = new CraftingResultInventory();
 
     private final PlayerInventory inventory;
 
     private final ScreenHandlerContext context;
 
-    private Predicate<SlotType> canShowSlots;
+    public Predicate<SlotType> canShowSlots;
 
     private final SpellbookState state;
 
@@ -80,7 +73,7 @@ public class SpellbookScreenHandler extends ScreenHandler {
 
         List<int[]> grid = new ArrayList<>();
         List<int[]> gemPos = new ArrayList<>();
-        createGrid(grid, gemPos);
+        SpellbookCraftingGrid.createGrid(grid, gemPos);
 
         MAX_INGREDIENTS = grid.size();
         GEM_SLOT_INDEX = MAX_INGREDIENTS;
@@ -91,10 +84,10 @@ public class SpellbookScreenHandler extends ScreenHandler {
 
         for (int i = 0; i < MAX_INGREDIENTS; i++) {
             var pos = grid.get(i);
-            addSlot(new ModifierSlot(input, i, pos));
+            addSlot(new IngredientSlot(this, input, i, pos));
         }
 
-        addSlot(gemSlot = new InputSlot(input, MAX_INGREDIENTS, gemPos.get(0)));
+        addSlot(gemSlot = new InputSlot(this, input, MAX_INGREDIENTS, gemPos.get(0)));
 
         for (int i = 0; i < 9; ++i) {
             addSlot(new Slot(inventory, i, 121 + i * 18, 195));
@@ -102,12 +95,12 @@ public class SpellbookScreenHandler extends ScreenHandler {
         for (int i = 0; i < PlayerInventory.MAIN_SIZE - 9; ++i) {
             int x = i % 5;
             int y = i / 5;
-            addSlot(new InventorySlot(inventory, i + 9, 225 + x * 20, 50 + y * 20));
+            addSlot(new InventorySlot(this, inventory, i + 9, 225 + x * 20, 50 + y * 20));
         }
 
         for (int i = 0; i < 4; i++) {
             final EquipmentSlot eq = EquipmentSlot.values()[5 - i];
-            addSlot(new InventorySlot(inventory, PlayerInventory.OFF_HAND_SLOT - i - 1, 340, 50 + (i * 20)) {
+            addSlot(new InventorySlot(this, inventory, PlayerInventory.OFF_HAND_SLOT - i - 1, 340, 50 + (i * 20)) {
                 @Override
                 public int getMaxItemCount() {
                     return 1;
@@ -134,14 +127,14 @@ public class SpellbookScreenHandler extends ScreenHandler {
             });
         }
 
-        addSlot(new InventorySlot(inventory, PlayerInventory.OFF_HAND_SLOT, 340, 150) {
+        addSlot(new InventorySlot(this, inventory, PlayerInventory.OFF_HAND_SLOT, 340, 150) {
             @Override
             public Pair<Identifier, Identifier> getBackgroundSprite() {
                 return Pair.of(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, PlayerScreenHandler.EMPTY_OFFHAND_ARMOR_SLOT);
             }
         });
 
-        addSlot(outputSlot = new ResultSlot(inventory.player, input, result, 0, gemPos.get(0)));
+        addSlot(outputSlot = new OutputSlot(this, inventory.player, input, result, 0, gemPos.get(0)));
 
         onContentChanged(input);
     }
@@ -194,11 +187,11 @@ public class SpellbookScreenHandler extends ScreenHandler {
         ItemStack transferredStack = sourceSlot.getStack();
         ItemStack stack = transferredStack.copy();
 
-        if (sourceSlot instanceof ResultSlot result) {
+        if (sourceSlot instanceof OutputSlot result) {
             result.onTakeItem(player, stack);
         }
 
-        if (index >= HOTBAR_START && !(sourceSlot instanceof ResultSlot || sourceSlot instanceof InputSlot)) {
+        if (index >= HOTBAR_START && !(sourceSlot instanceof OutputSlot || sourceSlot instanceof InputSlot)) {
             if (!gemSlot.hasStack() && gemSlot.canInsert(stack)) {
                 if (insertItem(transferredStack, GEM_SLOT_INDEX, GEM_SLOT_INDEX + 1, false)) {
                     onContentChanged(input);
@@ -304,205 +297,4 @@ public class SpellbookScreenHandler extends ScreenHandler {
         });
     }
 
-    /**
-     * Creates a hexagonal crafting grid.
-     * @param grid   Output for normal slot positions.
-     * @param gemPos Output for the gem slot position.
-     */
-    private static void createGrid(List<int[]> grid, List<int[]> gemPos) {
-        int cols = 4;
-        int spacing = 23;
-
-        int top = 34;
-        int left = 65;
-
-        for (int row = 0; row < 7; row++) {
-            for (int i = 0; i < cols; i++) {
-
-                int ring = 3;
-                if (row == 0 || row == 6) {
-                    ring = 1;
-                } else if ((row == 1 || row == 5) && i > 0 && i < cols - 1) {
-                    ring = 2;
-                } else {
-                    if (i == 0 || i == cols - 1) {
-                        ring = 1;
-                    } else if (i == 1 || i == cols - 2) {
-                        ring = 2;
-                    }
-                }
-
-                (row == 3 && i == 3 ? gemPos : grid).add(new int[] {
-                        left + (i * spacing),
-                        top,
-                        row == 3 && i == 3 ? 4 : ring
-                });
-            }
-            top += spacing * 0.9;
-            left -= (spacing / 2) * (row > 2 ? -1 : 1);
-            cols += row > 2 ? -1 : 1;
-        }
-    }
-
-    public interface SpellbookSlot {
-        int getRing();
-    }
-
-    public class SpellbookInventory extends CraftingInventory {
-        public SpellbookInventory(ScreenHandler handler, int width, int height) {
-            super(handler, width, height);
-        }
-
-        public ItemStack getItemToModify() {
-            return gemSlot.getStack();
-        }
-
-        public boolean hasIngredients() {
-            for (int i = 0; i < GEM_SLOT_INDEX; i++) {
-                if (!getStack(i).isEmpty()) {
-                    return true;
-                }
-            }
-            return false;
-        }
-
-        public int getRing(int slot) {
-            Slot s = slots.get(slot);
-            return s instanceof SpellbookSlot ? ((SpellbookSlot)s).getRing() : 0;
-        }
-
-        public SpellTraits getTraits() {
-            return SpellTraits.union(InventoryUtil.slots(this)
-                    .map(slot -> SpellTraits.of(getStack(slot)).multiply(getRingFactor(getRing(slot))))
-                    .toArray(SpellTraits[]::new)
-            );
-        }
-
-        public static float getRingFactor(int ring) {
-            switch (ring) {
-                case 1: return 1;
-                case 2: return 0.6F;
-                case 3: return 0.3F;
-                default: return 0;
-            }
-        }
-    }
-
-    public class InventorySlot extends Slot implements SpellbookSlot {
-        public InventorySlot(Inventory inventory, int index, int x, int y) {
-            super(inventory, index, x, y);
-        }
-
-        @Override
-        public int getRing() {
-            return 0;
-        }
-
-        @Override
-        public boolean isEnabled() {
-           return canShowSlots.test(SlotType.INVENTORY);
-        }
-    }
-
-    public class ModifierSlot extends Slot implements SpellbookSlot {
-        private final int ring;
-
-        public ModifierSlot(Inventory inventory, int index, int[] params) {
-            super(inventory, index, params[0], params[1]);
-            ring = params[2];
-        }
-
-        @Override
-        public int getMaxItemCount() {
-            return 1;
-        }
-
-        @Override
-        public boolean canInsert(ItemStack stack) {
-            return true;
-        }
-
-        @Override
-        public int getRing() {
-            return ring;
-        }
-
-        @Override
-        public boolean isEnabled() {
-           return canShowSlots.test(SlotType.CRAFTING) && super.isEnabled();
-        }
-    }
-
-    public class InputSlot extends Slot implements SpellbookSlot {
-        private final int ring;
-
-        public InputSlot(Inventory inventory, int index, int[] params) {
-            super(inventory, index, params[0], params[1]);
-            this.ring = params[2];
-        }
-
-        @Override
-        public int getMaxItemCount() {
-            return 1;
-        }
-
-        @Override
-        public int getRing() {
-            return ring;
-        }
-
-        @Override
-        public boolean isEnabled() {
-           return canShowSlots.test(SlotType.CRAFTING) && !outputSlot.isEnabled();
-        }
-    }
-
-    public class ResultSlot extends CraftingResultSlot implements SpellbookSlot {
-        private final PlayerEntity player;
-        private final SpellbookInventory input;
-
-        private final int ring;
-
-        public ResultSlot(PlayerEntity player, SpellbookInventory input, Inventory inventory, int index, int[] params) {
-            super(player, input, inventory, index, params[0], params[1]);
-            this.player = player;
-            this.input = input;
-            this.ring = params[2];
-        }
-
-        @Override
-        public void setStack(ItemStack stack) {
-            if (!stack.isEmpty() && !ItemStack.areEqual(stack, getStack())) {
-                BufferedExecutor.bufferExecution(player, () -> {
-                    player.playSound(stack.getItem() == UItems.BOTCHED_GEM ? USounds.GUI_ABILITY_FAIL : USounds.GUI_SPELL_CRAFT_SUCCESS, SoundCategory.MASTER, 1, 0.3F);
-                });
-            }
-            super.setStack(stack);
-        }
-
-        @Override
-        public int getRing() {
-            return ring;
-        }
-
-        @Override
-        public boolean isEnabled() {
-           return canShowSlots.test(SlotType.CRAFTING) && hasStack();
-        }
-
-        @Override
-        public void onTakeItem(PlayerEntity player, ItemStack stack) {
-            Pony pony = Pony.of(player);
-            InventoryUtil.stream(input).forEach(s -> {
-                pony.getDiscoveries().unlock(s.getItem());
-            });
-           //gemSlot.setStack(ItemStack.EMPTY);
-            super.onTakeItem(player, stack);
-        }
-    }
-
-    public enum SlotType {
-        INVENTORY,
-        CRAFTING
-    }
 }

src/main/java/com/minelittlepony/unicopia/container/inventory/IngredientSlot.java

@@ -0,0 +1,38 @@
+package com.minelittlepony.unicopia.container.inventory;
+
+import com.minelittlepony.unicopia.container.*;
+
+import net.minecraft.inventory.Inventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.screen.slot.Slot;
+
+public class IngredientSlot extends Slot implements SpellbookSlot {
+    private final SpellbookScreenHandler handler;
+    private final int ring;
+
+    public IngredientSlot(SpellbookScreenHandler handler, Inventory inventory, int index, int[] params) {
+        super(inventory, index, params[0], params[1]);
+        this.handler = handler;
+        ring = params[2];
+    }
+
+    @Override
+    public int getMaxItemCount() {
+        return 1;
+    }
+
+    @Override
+    public boolean canInsert(ItemStack stack) {
+        return true;
+    }
+
+    @Override
+    public int getRing() {
+        return ring;
+    }
+
+    @Override
+    public boolean isEnabled() {
+       return handler.canShowSlots.test(SlotType.CRAFTING) && super.isEnabled();
+    }
+}

src/main/java/com/minelittlepony/unicopia/container/inventory/InputSlot.java

@@ -0,0 +1,32 @@
+package com.minelittlepony.unicopia.container.inventory;
+
+import com.minelittlepony.unicopia.container.*;
+
+import net.minecraft.inventory.Inventory;
+import net.minecraft.screen.slot.Slot;
+
+public class InputSlot extends Slot implements SpellbookSlot {
+    private final SpellbookScreenHandler handler;
+    private final int ring;
+
+    public InputSlot(SpellbookScreenHandler handler, Inventory inventory, int index, int[] params) {
+        super(inventory, index, params[0], params[1]);
+        this.handler = handler;
+        this.ring = params[2];
+    }
+
+    @Override
+    public int getMaxItemCount() {
+        return 1;
+    }
+
+    @Override
+    public int getRing() {
+        return ring;
+    }
+
+    @Override
+    public boolean isEnabled() {
+       return handler.canShowSlots.test(SlotType.CRAFTING) && !handler.outputSlot.isEnabled();
+    }
+}

src/main/java/com/minelittlepony/unicopia/container/inventory/InventorySlot.java

@@ -0,0 +1,25 @@
+package com.minelittlepony.unicopia.container.inventory;
+
+import com.minelittlepony.unicopia.container.*;
+
+import net.minecraft.inventory.Inventory;
+import net.minecraft.screen.slot.Slot;
+
+public class InventorySlot extends Slot implements SpellbookSlot {
+    private final SpellbookScreenHandler handler;
+
+    public InventorySlot(SpellbookScreenHandler handler, Inventory inventory, int index, int x, int y) {
+        super(inventory, index, x, y);
+        this.handler = handler;
+    }
+
+    @Override
+    public int getRing() {
+        return 0;
+    }
+
+    @Override
+    public boolean isEnabled() {
+       return handler.canShowSlots.test(SlotType.INVENTORY);
+    }
+}

src/main/java/com/minelittlepony/unicopia/container/inventory/OutputSlot.java

@@ -0,0 +1,60 @@
+package com.minelittlepony.unicopia.container.inventory;
+
+import com.minelittlepony.unicopia.USounds;
+import com.minelittlepony.unicopia.client.sound.BufferedExecutor;
+import com.minelittlepony.unicopia.container.*;
+import com.minelittlepony.unicopia.entity.player.Pony;
+import com.minelittlepony.unicopia.item.UItems;
+import com.minelittlepony.unicopia.util.InventoryUtil;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.inventory.Inventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.screen.slot.CraftingResultSlot;
+import net.minecraft.sound.SoundCategory;
+
+public class OutputSlot extends CraftingResultSlot implements SpellbookSlot {
+    private final SpellbookScreenHandler handler;
+    private final PlayerEntity player;
+    private final SpellbookInventory input;
+
+    private final int ring;
+
+    public OutputSlot(SpellbookScreenHandler spellbookScreenHandler, PlayerEntity player, SpellbookInventory input, Inventory inventory, int index, int[] params) {
+        super(player, input, inventory, index, params[0], params[1]);
+        handler = spellbookScreenHandler;
+        this.player = player;
+        this.input = input;
+        this.ring = params[2];
+    }
+
+    @Override
+    public void setStack(ItemStack stack) {
+        if (!stack.isEmpty() && !ItemStack.areEqual(stack, getStack())) {
+            BufferedExecutor.bufferExecution(player, () -> {
+                player.playSound(stack.getItem() == UItems.BOTCHED_GEM ? USounds.GUI_ABILITY_FAIL : USounds.GUI_SPELL_CRAFT_SUCCESS, SoundCategory.MASTER, 1, 0.3F);
+            });
+        }
+        super.setStack(stack);
+    }
+
+    @Override
+    public int getRing() {
+        return ring;
+    }
+
+    @Override
+    public boolean isEnabled() {
+       return handler.canShowSlots.test(SlotType.CRAFTING) && hasStack();
+    }
+
+    @Override
+    public void onTakeItem(PlayerEntity player, ItemStack stack) {
+        Pony pony = Pony.of(player);
+        InventoryUtil.stream(input).forEach(s -> {
+            pony.getDiscoveries().unlock(s.getItem());
+        });
+       //gemSlot.setStack(ItemStack.EMPTY);
+        super.onTakeItem(player, stack);
+    }
+}

src/main/java/com/minelittlepony/unicopia/container/inventory/SlotType.java

@@ -0,0 +1,6 @@
+package com.minelittlepony.unicopia.container.inventory;
+
+public enum SlotType {
+    INVENTORY,
+    CRAFTING
+}

src/main/java/com/minelittlepony/unicopia/container/inventory/SpellbookCraftingGrid.java

@@ -0,0 +1,47 @@
+package com.minelittlepony.unicopia.container.inventory;
+
+import java.util.List;
+
+public interface SpellbookCraftingGrid {
+
+    /**
+     * Creates a hexagonal crafting grid.
+     * @param grid   Output for normal slot positions.
+     * @param gemPos Output for the gem slot position.
+     */
+    static void createGrid(List<int[]> grid, List<int[]> gemPos) {
+        int cols = 4;
+        int spacing = 23;
+
+        int top = 34;
+        int left = 65;
+
+        for (int row = 0; row < 7; row++) {
+            for (int i = 0; i < cols; i++) {
+
+                int ring = 3;
+                if (row == 0 || row == 6) {
+                    ring = 1;
+                } else if ((row == 1 || row == 5) && i > 0 && i < cols - 1) {
+                    ring = 2;
+                } else {
+                    if (i == 0 || i == cols - 1) {
+                        ring = 1;
+                    } else if (i == 1 || i == cols - 2) {
+                        ring = 2;
+                    }
+                }
+
+                (row == 3 && i == 3 ? gemPos : grid).add(new int[] {
+                        left + (i * spacing),
+                        top,
+                        row == 3 && i == 3 ? 4 : ring
+                });
+            }
+            top += spacing * 0.9;
+            left -= (spacing / 2) * (row > 2 ? -1 : 1);
+            cols += row > 2 ? -1 : 1;
+        }
+    }
+
+}

src/main/java/com/minelittlepony/unicopia/container/inventory/SpellbookInventory.java

@@ -0,0 +1,52 @@
+package com.minelittlepony.unicopia.container.inventory;
+
+import com.minelittlepony.unicopia.ability.magic.spell.trait.SpellTraits;
+import com.minelittlepony.unicopia.container.SpellbookScreenHandler;
+import com.minelittlepony.unicopia.util.InventoryUtil;
+
+import net.minecraft.inventory.CraftingInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.screen.slot.Slot;
+
+public class SpellbookInventory extends CraftingInventory {
+    private final SpellbookScreenHandler handler;
+
+    public SpellbookInventory(SpellbookScreenHandler handler, int width, int height) {
+        super(handler, width, height);
+        this.handler = handler;
+    }
+
+    public ItemStack getItemToModify() {
+        return handler.gemSlot.getStack();
+    }
+
+    public boolean hasIngredients() {
+        for (int i = 0; i < handler.GEM_SLOT_INDEX; i++) {
+            if (!getStack(i).isEmpty()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public int getRing(int slot) {
+        Slot s = handler.slots.get(slot);
+        return s instanceof SpellbookSlot ? ((SpellbookSlot)s).getRing() : 0;
+    }
+
+    public SpellTraits getTraits() {
+        return SpellTraits.union(InventoryUtil.slots(this)
+                .map(slot -> SpellTraits.of(getStack(slot)).multiply(getRingFactor(getRing(slot))))
+                .toArray(SpellTraits[]::new)
+        );
+    }
+
+    public static float getRingFactor(int ring) {
+        switch (ring) {
+            case 1: return 1;
+            case 2: return 0.6F;
+            case 3: return 0.3F;
+            default: return 0;
+        }
+    }
+}

src/main/java/com/minelittlepony/unicopia/container/inventory/SpellbookSlot.java

@@ -0,0 +1,5 @@
+package com.minelittlepony.unicopia.container.inventory;
+
+public interface SpellbookSlot {
+    int getRing();
+}