Implement various parts of the spellbook screen

gradle.properties

@@ -17,4 +17,4 @@ org.gradle.daemon=false
 # Dependencies
   modmenu_version=2.0.0-beta.7
   minelp_version=4.3.6
-  kirin_version=1.9.1
+  kirin_version=1.9.2-beta.1

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/trait/SpellTraits.java

@@ -29,6 +29,7 @@ import net.minecraft.nbt.NbtCompound;
 import net.minecraft.nbt.NbtElement;
 import net.minecraft.network.PacketByteBuf;
 import net.minecraft.text.Text;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.registry.Registry;
 
@@ -105,7 +106,7 @@ public final class SpellTraits implements Iterable<Map.Entry<Trait, Float>> {
 
     public NbtCompound toNbt() {
         NbtCompound nbt = new NbtCompound();
-        traits.forEach((key, value) -> nbt.putFloat(key.name(), value));
+        traits.forEach((key, value) -> nbt.putFloat(key.getId().toString(), value));
         return nbt;
     }
 
@@ -176,11 +177,15 @@ public final class SpellTraits implements Iterable<Map.Entry<Trait, Float>> {
         }
 
         for (int i = 0; i < count; i++) {
-            Trait trait = Trait.REGISTRY.getOrDefault(buf.readIdentifier(), null);
+            Identifier id = buf.readIdentifier();
             float value = buf.readFloat();
-            if (trait != null) {
-                entries.compute(trait, (k, v) -> v == null ? value : (v + value));
+            if (value == 0) {
+                continue;
             }
+
+            Trait.fromId(id).ifPresent(trait -> {
+                entries.compute(trait, (k, v) -> v == null ? value : (v + value));
+            });
         }
         if (entries.isEmpty()) {
             return Optional.empty();
@@ -190,8 +195,8 @@ public final class SpellTraits implements Iterable<Map.Entry<Trait, Float>> {
 
     public static Stream<Map.Entry<Trait, Float>> streamFromNbt(NbtCompound traits) {
         return traits.getKeys().stream().map(key -> {
-            Trait trait = Trait.REGISTRY.get(key.toUpperCase());
-            if (trait == null && !traits.contains(key, NbtElement.NUMBER_TYPE)) {
+            Trait trait = Trait.fromId(key).orElse(null);
+            if (trait == null || !traits.contains(key, NbtElement.NUMBER_TYPE)) {
                 return null;
             }
             return Map.entry(trait, traits.getFloat(key));
@@ -200,7 +205,7 @@ public final class SpellTraits implements Iterable<Map.Entry<Trait, Float>> {
 
     public static Stream<Map.Entry<Trait, Float>> streamFromJson(JsonObject traits) {
         return traits.entrySet().stream().map(entry -> {
-            Trait trait = Trait.REGISTRY.get(entry.getKey().toUpperCase());
+            Trait trait = Trait.fromName(entry.getKey()).orElse(null);
             if (trait == null || !entry.getValue().isJsonPrimitive() && !entry.getValue().getAsJsonPrimitive().isNumber()) {
                 return null;
             }

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/trait/Trait.java

@@ -1,7 +1,9 @@
 package com.minelittlepony.unicopia.ability.magic.spell.trait;
 
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Map;
+import java.util.Optional;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
@@ -33,14 +35,14 @@ public enum Trait {
     POISON(TraitGroup.DARKNESS),
     BLOOD(TraitGroup.DARKNESS);
 
-    public static final Map<String, Trait> REGISTRY = Arrays.stream(values()).collect(Collectors.toMap(Trait::name, Function.identity()));
-
+    private static final Map<String, Trait> REGISTRY = Arrays.stream(values()).collect(Collectors.toMap(Trait::name, Function.identity()));
+    private static final Map<Identifier, Trait> IDS = Arrays.stream(values()).collect(Collectors.toMap(Trait::getId, Function.identity()));
     private final Identifier id;
     private final Identifier sprite;
     private final TraitGroup group;
 
     Trait(TraitGroup group) {
-        this.id = new Identifier("unicopia", "spell/trait/" + name().toLowerCase());
+        this.id = new Identifier("unicopia", name().toLowerCase());
         this.sprite = new Identifier("unicopia", "textures/gui/trait/" + name().toLowerCase() + ".png");
         this.group = group;
     }
@@ -56,4 +58,20 @@ public enum Trait {
     public Identifier getSprite() {
         return sprite;
     }
+
+    public static Collection<Trait> all() {
+        return IDS.values();
+    }
+
+    public static Optional<Trait> fromId(Identifier id) {
+        return Optional.ofNullable(IDS.getOrDefault(id, null));
+    }
+
+    public static Optional<Trait> fromId(String name) {
+        return Optional.ofNullable(Identifier.tryParse(name)).flatMap(Trait::fromId);
+    }
+
+    public static Optional<Trait> fromName(String name) {
+        return Optional.ofNullable(REGISTRY.getOrDefault(name.toUpperCase(), null));
+    }
 }

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/trait/TraitDiscovery.java

@@ -27,9 +27,9 @@ import net.minecraft.util.registry.Registry;
 import net.minecraft.world.World;
 
 public class TraitDiscovery implements NbtSerialisable {
-    private final Set<Identifier> unreadTraits = new HashSet<>();
+    private final Set<Trait> unreadTraits = new HashSet<>();
 
-    private final Set<Identifier> traits = new HashSet<>();
+    private final Set<Trait> traits = new HashSet<>();
     private final Map<Identifier, SpellTraits> items = new HashMap<>();
 
     private final Pony pony;
@@ -57,8 +57,8 @@ public class TraitDiscovery implements NbtSerialisable {
         SpellTraits traits = SpellTraits.of(item);
         items.put(Registry.ITEM.getId(item), traits);
         traits.entries().forEach(e -> {
-            if (this.traits.add(e.getKey().getId())) {
-                unreadTraits.add(e.getKey().getId());
+            if (this.traits.add(e.getKey())) {
+                unreadTraits.add(e.getKey());
             }
         });
         pony.setDirty();
@@ -68,6 +68,14 @@ public class TraitDiscovery implements NbtSerialisable {
         return items.getOrDefault(Registry.ITEM.getId(item), SpellTraits.EMPTY);
     }
 
+    public boolean isUnread(Trait trait) {
+        return unreadTraits.contains(trait);
+    }
+
+    public boolean isKnown(Trait trait) {
+        return traits.contains(trait);
+    }
+
     @Environment(EnvType.CLIENT)
     public void appendTooltip(ItemStack stack, @Nullable World world, List<Text> tooltip) {
         getKnownTraits(stack.getItem()).appendTooltip(tooltip);
@@ -82,11 +90,11 @@ public class TraitDiscovery implements NbtSerialisable {
         compound.put("items", disco);
 
         NbtList a = new NbtList();
-        this.traits.forEach(id -> a.add(NbtString.of(id.toString())));
+        this.traits.forEach(id -> a.add(NbtString.of(id.getId().toString())));
         compound.put("traits", a);
 
         NbtList b = new NbtList();
-        unreadTraits.forEach(id -> b.add(NbtString.of(id.toString())));
+        unreadTraits.forEach(id -> b.add(NbtString.of(id.getId().toString())));
         compound.put("unreadTraits", b);
     }
 
@@ -101,12 +109,18 @@ public class TraitDiscovery implements NbtSerialisable {
                 });
             });
         });
-        compound.getList("traits", NbtElement.STRING_TYPE).forEach(el -> {
-            Optional.ofNullable(Identifier.tryParse(el.asString())).ifPresent(this.traits::add);
-        });
-        compound.getList("unreadTraits", NbtElement.STRING_TYPE).forEach(el -> {
-            Optional.ofNullable(Identifier.tryParse(el.asString())).ifPresent(this.unreadTraits::add);
-        });
+        compound.getList("traits", NbtElement.STRING_TYPE).stream()
+            .map(NbtElement::asString)
+            .map(Trait::fromId)
+            .filter(Optional::isPresent)
+            .map(Optional::get)
+            .forEach(this.traits::add);
+        compound.getList("unreadTraits", NbtElement.STRING_TYPE).stream()
+            .map(NbtElement::asString)
+            .map(Trait::fromId)
+            .filter(Optional::isPresent)
+            .map(Optional::get)
+            .forEach(this.unreadTraits::add);
     }
 
     public void copyFrom(TraitDiscovery old) {

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/trait/TraitLoader.java

@@ -55,7 +55,7 @@ public class TraitLoader extends SinglePreparationResourceReloader<Map<Identifie
                             try {
                                 Identifier id = new Identifier(name);
                                 SpellTraits.fromEntries(Arrays.stream(set.split(" ")).map(a -> a.split(":")).map(pair -> {
-                                    Trait key = Trait.REGISTRY.get(pair[0].toUpperCase());
+                                    Trait key = Trait.fromName(pair[0]).orElse(null);
                                     if (key == null) {
                                         Unicopia.LOGGER.warn("Failed to load trait entry for item {} in {}. {} is not a valid trait", id, resource.getResourcePackName(), pair[0]);
                                         return null;

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

@@ -0,0 +1,36 @@
+package com.minelittlepony.unicopia.container;
+
+import net.minecraft.text.Text;
+import net.minecraft.text.TranslatableText;
+import net.minecraft.util.math.MathHelper;
+
+public enum SpellbookPage {
+    INVENTORY,
+    DISCOVERIES,
+    RECIPES;
+
+    public static final SpellbookPage[] VALUES = values();
+    private static int current;
+
+    private final Text label = new TranslatableText("gui.unicopia.spellbook.page." + name().toLowerCase());
+
+    public Text getLabel() {
+        return label;
+    }
+
+    public boolean isFirst() {
+        return ordinal() == 0;
+    }
+
+    public boolean isLast() {
+        return ordinal() == VALUES.length - 1;
+    }
+
+    public static SpellbookPage getCurrent() {
+        return VALUES[current];
+    }
+
+    public static void swap(int increment) {
+        current = MathHelper.clamp(current + increment, 0, VALUES.length - 1);
+    }
+}

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

@@ -1,27 +1,93 @@
 package com.minelittlepony.unicopia.container;
 
+import java.util.List;
+
+import com.minelittlepony.common.client.gui.IViewRoot;
+import com.minelittlepony.common.client.gui.ScrollContainer;
+import com.minelittlepony.common.client.gui.element.Button;
+import com.minelittlepony.common.client.gui.sprite.TextureSprite;
+import com.minelittlepony.unicopia.ability.magic.spell.trait.Trait;
+import com.minelittlepony.unicopia.ability.magic.spell.trait.TraitDiscovery;
 import com.minelittlepony.unicopia.container.SpellbookScreenHandler.SpellbookSlot;
+import com.minelittlepony.unicopia.entity.player.Pony;
+import com.mojang.blaze3d.platform.GlStateManager;
 import com.mojang.blaze3d.systems.RenderSystem;
 
 import net.minecraft.client.gui.screen.ingame.HandledScreen;
+import net.minecraft.client.render.GameRenderer;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.entity.player.PlayerInventory;
 import net.minecraft.screen.slot.Slot;
+import net.minecraft.text.LiteralText;
 import net.minecraft.text.Text;
+import net.minecraft.text.TranslatableText;
 import net.minecraft.util.Identifier;
 
 public class SpellbookScreen extends HandledScreen<SpellbookScreenHandler> {
     public static final Identifier TEXTURE = new Identifier("unicopia", "textures/gui/container/book.png");
+    public static final Identifier SLOT = new Identifier("unicopia", "textures/gui/container/slot.png");
+
+    private final ScrollContainer container = new ScrollContainer() {
+        {
+            backgroundColor = 0xFFf9efd3;
+            scrollbar.layoutToEnd = true;
+        }
+        @Override
+        public void init(Runnable contentInitializer) {
+            margin.left = SpellbookScreen.this.x + backgroundWidth / 2 + 10;
+            margin.top = SpellbookScreen.this.y + 35;
+            margin.right = SpellbookScreen.this.width - backgroundWidth - SpellbookScreen.this.x + 30;
+            margin.bottom = SpellbookScreen.this.height - backgroundHeight - SpellbookScreen.this.y + 40;
+            super.init(contentInitializer);
+        }
+
+        @Override
+        public void drawOverlays(MatrixStack matrices, int mouseX, int mouseY, float partialTicks) {
+            matrices.push();
+            matrices.translate(margin.left, margin.top, 0);
+            matrices.translate(-2, -2, 0);
+            RenderSystem.enableBlend();
+            RenderSystem.setShaderTexture(0, TEXTURE);
+            int tileSize = 25;
+
+            final int bottom = height - tileSize + 4;
+            final int right = width - tileSize + 9;
+
+            drawTexture(matrices, 0, 0, 405, 62, tileSize, tileSize, 512, 256);
+            drawTexture(matrices, right, 0, 425, 62, tileSize, tileSize, 512, 256);
+
+            drawTexture(matrices, 0, bottom, 405, 72, tileSize, tileSize, 512, 256);
+            drawTexture(matrices, right, bottom, 425, 72, tileSize, tileSize, 512, 256);
+
+            for (int i = tileSize; i < right; i += tileSize) {
+                drawTexture(matrices, i, 0, 415, 62, tileSize, tileSize, 512, 256);
+                drawTexture(matrices, i, bottom, 415, 72, tileSize, tileSize, 512, 256);
+            }
+
+            for (int i = tileSize; i < bottom; i += tileSize) {
+                drawTexture(matrices, 0, i, 405, 67, tileSize, tileSize, 512, 256);
+                drawTexture(matrices, right, i, 425, 67, tileSize, tileSize, 512, 256);
+            }
+            matrices.pop();
+
+            super.drawOverlays(matrices, mouseX, mouseY, partialTicks);
+        }
+    };
 
     public SpellbookScreen(SpellbookScreenHandler handler, PlayerInventory inventory, Text title) {
         super(handler, inventory, title);
         backgroundWidth = 405;
         backgroundHeight = 219;
+        titleX = 30;
+        titleY = 20;
     }
 
     @Override
     public void init() {
         super.init();
+        container.init(this::initPageContent);
+        addDrawableChild(new PageButton(x + 350, y + 187, 1));
+        addDrawableChild(new PageButton(x + 300, y + 187, -1));
     }
 
     @Override
@@ -34,30 +100,172 @@ public class SpellbookScreen extends HandledScreen<SpellbookScreenHandler> {
     protected void drawBackground(MatrixStack matrices, float delta, int mouseX, int mouseY) {
         renderBackground(matrices, 0);
         RenderSystem.setShaderColor(1, 1, 1, 1);
+        RenderSystem.setShaderTexture(0, TEXTURE);
 
         int left = (width - backgroundWidth) / 2;
         int top = (height - backgroundHeight) / 2;
 
-        RenderSystem.setShaderTexture(0, TEXTURE);
-
         drawTexture(matrices, left, top, 0, 0, backgroundWidth, backgroundHeight, 512, 256);
+    }
 
-        matrices.push();
-        matrices.translate(this.x, this.y, 0);
-
+    @Override
+    protected void drawForeground(MatrixStack matrices, int mouseX, int mouseY) {
+        RenderSystem.setShaderColor(1, 1, 1, 1);
+        RenderSystem.setShaderTexture(0, SLOT);
         RenderSystem.enableBlend();
         for (Slot slot : handler.slots) {
             if (slot.isEnabled() && slot instanceof SpellbookSlot) {
-                drawTexture(matrices, slot.x - 1, slot.y - 1, 74, 223, 18, 18, 512, 256);
-              //  drawStringWithShadow(matrices, this.textRenderer, ((SpellbookSlot)slot).getRing() + "", slot.x, slot.y, 0x000000FF);
+                drawTexture(matrices, slot.x - 8, slot.y - 8, 0, 0, 32, 32, 32, 32);
             }
         }
         RenderSystem.disableBlend();
 
+        textRenderer.draw(matrices, title, titleX, titleY, 4210752);
+        textRenderer.draw(matrices, SpellbookPage.getCurrent().getLabel(), 220, this.titleY, 4210752);
+    }
+
+    private void initPageContent() {
+        container.getContentPadding().setVertical(10);
+        addDrawable(container);
+        ((IViewRoot)this).getChildElements().add(container);
+
+        switch (SpellbookPage.getCurrent()) {
+            case DISCOVERIES: {
+                int top = 10;
+                int left = 25;
+
+                int i = 0;
+                int cols = 4;
+
+                for (Trait trait : Trait.all()) {
+                    int x = i % cols;
+                    int y = i / cols;
+
+                    container.addButton(new TraitButton(left + x * 32, top + y * 32, trait));
+                    i++;
+                }
+                break;
+            }
+            case INVENTORY:
+            case RECIPES:
+        }
+    }
+
+    @Override
+    public boolean mouseReleased(double mouseX, double mouseY, int button) {
+        return hoveredElement(mouseX, mouseY).filter((element) -> {
+            setDragging(false);
+            return element.mouseReleased(mouseX, mouseY, button);
+        }).isPresent() || super.mouseReleased(mouseX, mouseY, button);
+    }
+
+    @Override
+    public boolean mouseDragged(double mouseX, double mouseY, int button, double deltaX, double deltaY) {
+        return (getFocused() != null && isDragging() && button == 0 && getFocused().mouseDragged(mouseX, mouseY, button, deltaX, deltaY))
+            || super.mouseDragged(mouseX, mouseY, button, deltaX, deltaY);
+    }
+
+    class PageButton extends ImageButton {
+        private final int increment;
+        private final TextureSprite sprite = new TextureSprite()
+                .setSize(25, 13)
+                .setTextureSize(256, 512)
+                .setTextureOffset(0, 479)
+                .setTexture(TEXTURE);
+
+        public PageButton(int x, int y, int increment) {
+            super(x, y, 25, 20);
+            this.increment = increment;
+            getStyle().setIcon(sprite);
+            onClick(sender -> {
+                SpellbookPage.swap(increment);
+                init(client, SpellbookScreen.this.width, SpellbookScreen.this.height);
+            });
+        }
+
+        @Override
+        public void renderButton(MatrixStack matrices, int mouseX, int mouseY, float partialTicks) {
+
+            setEnabled(increment < 0 ? !SpellbookPage.getCurrent().isFirst() : !SpellbookPage.getCurrent().isLast());
+
+            if (!active) {
+               return;
+            }
+
+            int state = hovered ? 1 : 0;
+
+            sprite.setTextureOffset(23 * state, (int)(479 + 6.5F - (increment * 6.5F)));
+            super.renderButton(matrices, mouseX, mouseY, partialTicks);
+        }
+    }
+
+    class TraitButton extends ImageButton {
+        private final Trait trait;
+
+        public TraitButton(int x, int y, Trait trait) {
+            super(x, y, 16, 16);
+            this.trait = trait;
+            getStyle().setIcon(new TextureSprite()
+                    .setTextureSize(16, 16)
+                    .setSize(16, 16)
+                    .setTexture(trait.getSprite()));
+            getStyle().setTooltip(List.of(
+                new TranslatableText("trait." + trait.getId().getNamespace() + "." + trait.getId().getPath() + ".name"),
+                new TranslatableText("trait." + trait.getId().getNamespace() + "." + trait.getId().getPath() + ".description")
+            ));
+            getStyle().setTooltip(List.of(
+                new LiteralText(trait.name()),
+                new LiteralText("Test description")
+            ));
+        }
+
+        @Override
+        public void renderButton(MatrixStack matrices, int mouseX, int mouseY, float partialTicks) {
+            TraitDiscovery discoveries = Pony.of(client.player).getDiscoveries();
+            setEnabled(discoveries.isKnown(trait));
+
+            RenderSystem.setShaderColor(1, 1, 1, 1);
+            RenderSystem.setShaderTexture(0, TEXTURE);
             RenderSystem.enableBlend();
-        drawTexture(matrices, 56, 50, 407, 2, 100, 101, 512, 256);
-        RenderSystem.disableBlend();
+            drawTexture(matrices, x - 2, y - 8, 204, 219, 22, 32, 512, 256);
+            drawTexture(matrices, x - 2, y - 1, 74, 223, 18, 18, 512, 256);
 
-        matrices.pop();
+            super.renderButton(matrices, mouseX, mouseY, partialTicks);
+            hovered &= active;
+        }
+
+        @Override
+        public Button setEnabled(boolean enable) {
+            alpha = enable ? 1 : 0.1125F;
+            return super.setEnabled(enable);
+        }
+    }
+
+    class ImageButton extends Button {
+
+        public ImageButton(int x, int y) {
+            super(x, y);
+        }
+
+        public ImageButton(int x, int y, int width, int height) {
+            super(x, y, width, height);
+        }
+
+        @Override
+        public void renderButton(MatrixStack matrices, int mouseX, int mouseY, float partialTicks) {
+            RenderSystem.setShader(GameRenderer::getPositionTexShader);
+
+            RenderSystem.setShaderColor(1, 1, 1, alpha);
+            RenderSystem.defaultBlendFunc();
+            RenderSystem.blendFunc(
+                    GlStateManager.SrcFactor.SRC_ALPHA,
+                    GlStateManager.DstFactor.ONE_MINUS_SRC_ALPHA);
+
+            if (getStyle().hasIcon()) {
+                getStyle().getIcon().render(matrices, x, y, mouseX, mouseY, partialTicks);
+            }
+
+            RenderSystem.setShaderColor(1, 1, 1, 1);
+        }
     }
 }

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

@@ -10,7 +10,11 @@ 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;
+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;
@@ -18,6 +22,7 @@ import net.minecraft.inventory.CraftingResultInventory;
 import net.minecraft.inventory.Inventory;
 import net.minecraft.item.ItemStack;
 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;
@@ -25,10 +30,18 @@ import net.minecraft.screen.slot.Slot;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.sound.SoundCategory;
 import net.minecraft.sound.SoundEvents;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.collection.DefaultedList;
 
 public class SpellbookScreenHandler extends ScreenHandler {
 
+    private static final Identifier[] EMPTY_ARMOR_SLOT_TEXTURES = new Identifier[]{
+            PlayerScreenHandler.EMPTY_BOOTS_SLOT_TEXTURE,
+            PlayerScreenHandler.EMPTY_LEGGINGS_SLOT_TEXTURE,
+            PlayerScreenHandler.EMPTY_CHESTPLATE_SLOT_TEXTURE,
+            PlayerScreenHandler.EMPTY_HELMET_SLOT_TEXTURE
+    };
+
     private final int MAX_INGREDIENTS;
 
     private final int GEM_SLOT_INDEX;
@@ -73,6 +86,47 @@ public class SpellbookScreenHandler extends ScreenHandler {
         for (int i = 0; i < 9; ++i) {
             addSlot(new Slot(inventory, i, 121 + i * 18, 195));
         }
+        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));
+        }
+
+        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)) {
+                @Override
+                public int getMaxItemCount() {
+                    return 1;
+                }
+
+                @Override
+                public boolean canInsert(ItemStack stack) {
+                    return eq == MobEntity.getPreferredEquipmentSlot(stack);
+                }
+
+                @Override
+                public boolean canTakeItems(PlayerEntity playerEntity) {
+                    ItemStack stack = getStack();
+                    if (!stack.isEmpty() && !playerEntity.isCreative() && EnchantmentHelper.hasBindingCurse(stack)) {
+                        return false;
+                    }
+                    return super.canTakeItems(playerEntity);
+                }
+
+                @Override
+                public Pair<Identifier, Identifier> getBackgroundSprite() {
+                    return Pair.of(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, EMPTY_ARMOR_SLOT_TEXTURES[eq.getEntitySlotId()]);
+                }
+            });
+        }
+
+        addSlot(new InventorySlot(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);
+            }
+        });
 
         onContentChanged(input);
     }
@@ -126,6 +180,18 @@ public class SpellbookScreenHandler extends ScreenHandler {
                 onContentChanged(input);
                 return ItemStack.EMPTY;
             }
+
+            if (insertItem(transferredStack, HOTBAR_END + 27, HOTBAR_END + 27 + 4, false)) {
+                sourceSlot.onQuickTransfer(transferredStack, stack);
+                onContentChanged(input);
+                return ItemStack.EMPTY;
+            }
+
+            if (insertItem(transferredStack, HOTBAR_END, HOTBAR_END + 27, false)) {
+                sourceSlot.onQuickTransfer(transferredStack, stack);
+                onContentChanged(input);
+                return ItemStack.EMPTY;
+            }
         }
 
         if (transferredStack.getCount() == stack.getCount()) {
@@ -279,6 +345,22 @@ public class SpellbookScreenHandler extends ScreenHandler {
         }
     }
 
+    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 SpellbookPage.getCurrent() == SpellbookPage.INVENTORY;
+        }
+    }
+
     public class InputSlot extends Slot implements SpellbookSlot {
         private final int ring;
 

src/main/resources/assets/unicopia/lang/en_us.json

@@ -257,6 +257,10 @@
   "gui.unicopia.tribe_selection.confirm.bads.2.changeling": " - Require love, collected from ponies or other hostile mobs to subsidise their diet",
   "gui.unicopia.tribe_selection.confirm.bads.3.changeling": " - Becomes sick from eating regular food and must eat love hasten a cure",
 
+  "gui.unicopia.spellbook.page.inventory": "Inventory",
+  "gui.unicopia.spellbook.page.discoveries": "Discoveries",
+  "gui.unicopia.spellbook.page.recipes": "Recipes",
+
   "unicopia.category.name": "Pony Abilities",
 
   "key.unicopia.primary": "Primary Ability",

src/main/resources/data/unicopia/recipes/spellbook/burned_juice.json

@@ -0,0 +1,14 @@
+{
+  "type": "unicopia:spellbook/crafting",
+  "material": {
+    "item": {
+      "item": "unicopia:gemstone"
+    }
+  },
+  "traits": {
+    "pestilence": 1
+  },
+  "result": {
+    "item": "unicopia:burned_juice"
+  }
+}