display missing cakes and highlight cakes that are missing

src/client/java/skybakery/SkyBakeryClient.java

@@ -1,19 +1,42 @@
 package skybakery;
 
+import java.util.List;
 import java.util.Optional;
 
 import net.fabricmc.api.ClientModInitializer;
+import net.fabricmc.fabric.api.client.command.v2.ClientCommandManager;
+import net.fabricmc.fabric.api.client.command.v2.ClientCommandRegistrationCallback;
 import net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents;
 import net.fabricmc.fabric.api.client.screen.v1.ScreenEvents;
+import net.minecraft.client.gui.screen.ingame.HandledScreen;
 import net.minecraft.client.network.ServerInfo;
 import net.minecraft.item.ItemStack;
+import net.minecraft.screen.slot.Slot;
 import skybakery.assets.NewYearCakeAsset;
+import skybakery.mixin.client.HandledScreenAccessor;
 import skybakery.repository.NewYearCakeRepository;
 import skybakery.utilities.ChatMenu;
 
 public class SkyBakeryClient implements ClientModInitializer {
 	public static final String HYPIXEL_URL = "hypixel.net";
 	public static final NewYearCakeRepository CAKE_REPOSITORY = new NewYearCakeRepository();
+	private static final int MAX_CAKE_YEAR = 500;
+
+	private static String formatRanges(List<Integer> years) {
+		StringBuilder sb = new StringBuilder();
+		int start = years.get(0);
+		int end = start;
+		for (int i = 1; i < years.size(); i++) {
+			if (years.get(i) == end + 1) {
+				end = years.get(i);
+			} else {
+				sb.append(start == end ? start : start + "-" + end).append(", ");
+				start = end = years.get(i);
+			}
+		}
+		sb.append(start == end ? start : start + "-" + end);
+		return sb.toString();
+	}
 
 	@Override
 	public void onInitializeClient() {
@@ -41,6 +64,51 @@ public class SkyBakeryClient implements ClientModInitializer {
 			CAKE_REPOSITORY.save();
 		});
 
+		ClientCommandRegistrationCallback.EVENT.register((dispatcher, registryAccess) -> {
+			dispatcher.register(
+				ClientCommandManager.literal("skybakery")
+					.then(ClientCommandManager.literal("missing")
+						.executes(ctx -> {
+							List<Integer> missing = CAKE_REPOSITORY.getMissingYears(MAX_CAKE_YEAR);
+							if (missing.isEmpty()) {
+								ChatMenu.send("You have all cakes from Year 1 to " + MAX_CAKE_YEAR + "!");
+							} else {
+								ChatMenu.send("Missing " + missing.size() + "/" + MAX_CAKE_YEAR + " cakes: " + formatRanges(missing));
+							}
+							return 1;
+						}))
+					.then(ClientCommandManager.literal("flush")
+						.executes(ctx -> {
+							CAKE_REPOSITORY.save();
+							ChatMenu.send("Cake collection flushed to disk.");
+							return 1;
+						}))
+			);
+		});
+
+		ScreenEvents.AFTER_INIT.register((client, screen, scaledWidth, scaledHeight) -> {
+			if (!(screen instanceof HandledScreen<?> handledScreen)) return;
+			if (!screen.getTitle().getString().contains("Auction")) return;
+
+			ScreenEvents.afterRender(screen).register((s, drawContext, mouseX, mouseY, tickDelta) -> {
+				HandledScreenAccessor accessor = (HandledScreenAccessor) handledScreen;
+				for (Slot slot : handledScreen.getScreenHandler().slots) {
+					ItemStack stack = slot.getStack();
+					if (stack.isEmpty()) continue;
+					if (!stack.getName().getString().contains("New Year Cake")) continue;
+
+					Optional<NewYearCakeAsset> asset = NewYearCakeAsset.from(stack);
+					if (asset.isEmpty()) continue;
+
+					if (CAKE_REPOSITORY.getByYear(asset.get().year()).isEmpty()) {
+						int x = accessor.getGuiLeft() + slot.x;
+						int y = accessor.getGuiTop() + slot.y;
+						drawContext.fill(x, y, x + 16, y + 16, 0x80FF0000);
+					}
+				}
+			});
+		});
+
 		ScreenEvents.AFTER_INIT.register((client, screen, scaledWidth, scaledHeight) -> {
 			if (client.player == null)
 				return;

src/client/java/skybakery/mixin/client/HandledScreenAccessor.java

@@ -0,0 +1,14 @@
+package skybakery.mixin.client;
+
+import net.minecraft.client.gui.screen.ingame.HandledScreen;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(HandledScreen.class)
+public interface HandledScreenAccessor {
+    @Accessor("x")
+    int getGuiLeft();
+
+    @Accessor("y")
+    int getGuiTop();
+}

src/client/java/skybakery/repository/NewYearCakeRepository.java

@@ -59,6 +59,16 @@ public class NewYearCakeRepository {
         return cakes.isEmpty();
     }
 
+    public List<Integer> getMissingYears(int maxYear) {
+        List<Integer> missing = new ArrayList<>();
+        for (int year = 1; year <= maxYear; year++) {
+            List<NewYearCakeAsset> forYear = cakes.get(year);
+            if (forYear == null || forYear.isEmpty())
+                missing.add(year);
+        }
+        return missing;
+    }
+
     public void load() {
         if (!Files.exists(file))
             return;

src/client/resources/skybakery.client.mixins.json

@@ -3,7 +3,8 @@
 	"package": "skybakery.mixin.client",
 	"compatibilityLevel": "JAVA_21",
 	"client": [
-		"ExampleClientMixin"
+		"ExampleClientMixin",
+		"HandledScreenAccessor"
 	],
 	"injectors": {
 		"defaultRequire": 1