Add 26.3 descriptive book binding and travel

docs/MINECRAFT_26_3_ALPHA_2.md

@@ -0,0 +1,37 @@
+# Rivencraft 1.0.1.3-alpha.1 — Minecraft 26.3
+
+Experimental **NeoForge 26.3** port preview. This is separate from the
+supported Minecraft 1.21.1 release and does **not** have feature parity. Use
+a disposable test world or make a backup first. Do not migrate a 1.21.1
+Rivencraft world to this alpha.
+
+## Changes since 1.0.1.2-alpha.1
+
+- An unbound Descriptive Book now opens a naming screen. Binding it creates a
+  distinct prototype Age with a random seed; duplicate names receive a
+  numbered suffix.
+- A bound Descriptive Book opens a book screen whose destination panel can be
+  clicked to enter its Age. The server validates the held book and waits for
+  the client's Age catalog acknowledgement before travel.
+- Retired Age IDs are excluded when assigning a new book's Age name, so an
+  archived world cannot be silently reused.
+
+## Still experimental
+
+These Ages use prototype vanilla terrain. Page-authored generation, crafting
+and workstations, most items and blocks, portals, Link modifiers, instability,
+live destination previews, and optional mod integrations are not ported. The
+book panel is a placeholder, not a rendered destination view. The
+[port status](MINECRAFT_26_3_PORT.md) and [open port issues](https://git.paddedcell.org/dnorberg/rivencraft/issues)
+track the remaining work. The stable 1.21.1 release remains available
+separately.
+
+## Verification
+
+- Clean 26.3 Gradle build passed.
+- Disposable dedicated-server smoke test passed: two distinct Age seeds and
+  their terrain persisted across restart.
+- The player verified Descriptive Book binding and travel in game on
+  2026-10-29.
+
+These checks are **not** the full port acceptance matrix or a stability claim.

docs/MINECRAFT_26_3_PORT.md

@@ -374,6 +374,13 @@ prototype vanilla terrain, normal authoring and most content are absent, and
 worlds should be disposable or backed up. The 1.21.1 stable release remains
 independent; issues #96–#104 stay open until the full port and validation pass.
 
+The next development slice, `1.0.1.3-alpha.1`, adds a basic Descriptive Book
+screen and server-validated binding. Naming an unbound book creates a unique
+prototype Age with a random seed; clicking the bound book's placeholder panel
+uses the acknowledged-catalog travel gate. This is not authored Page binding
+or a live destination preview. The player confirmed the Descriptive Book
+binding and travel interaction in game on 2026-10-29.
+
 ## Verification of this first slice
 
 The 1.21.1 `compileJava` and `build` tasks passed offline after the backend

ports/mc263/README.md

@@ -3,8 +3,10 @@
 This is an **experimental alpha port** for issues #97–#104, not gameplay parity
 with the Minecraft 1.21.1 release. It registers basic items and a runtime Age
 prototype with persisted seeds. The operator-only `rivencraft_port age`
-commands create and inspect separate vanilla-terrain levels. Descriptive Book
+commands create and inspect separate vanilla-terrain levels. The current
-travel and named Linking Book binding/travel work as limited probes. Authored
+development slice can name an unbound Descriptive Book to create a prototype
+Age, then enter it from the book GUI; the player verified this interaction in game.
+Named Linking Book binding/travel works as a limited probe. Authored
 generation, most content, recipes, workstations, portal systems, modifiers and
 the destination preview renderer remain unported. Use a test world and keep a
 backup; do not substitute this JAR for the 1.21.1 mod or import 1.21.1 saves.

ports/mc263/gradle.properties

@@ -7,4 +7,4 @@ neo_version=26.3.0.99
 mod_id=rivencraft
 mod_name=Rivencraft
 mod_license=LGPL-3.0-or-later
-mod_version=1.0.1.2-alpha.1
+mod_version=1.0.1.3-alpha.1

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/RuntimeAgeBackend.java

@@ -153,6 +153,13 @@ public final class RuntimeAgeBackend {
         return index(server).entries();
     }
 
+    /** Includes retired IDs, which must never be silently reused by a new book. */
+    public static boolean isNameTaken(MinecraftServer server, Identifier id) {
+        checkServerThread(server);
+        ageName(id);
+        return index(server).contains(id);
+    }
+
     private static AgeLevelIndex index(MinecraftServer server) {
         return server.overworld().getDataStorage().computeIfAbsent(AgeLevelIndex.TYPE);
     }

ports/mc263/src/main/java/net/dnorberg/rivencraft/client/PortBookInteractionHandler.java

@@ -16,11 +16,14 @@ public final class PortBookInteractionHandler {
 
     @SubscribeEvent
     public static void onRightClickItem(PlayerInteractEvent.RightClickItem event) {
-        if (!event.getEntity().level().isClientSide()
+        if (!event.getEntity().level().isClientSide()) return;
-                || !event.getItemStack().is(Rivencraft.LINKING_BOOK.get())) return;
+        boolean linking = event.getItemStack().is(Rivencraft.LINKING_BOOK.get());
+        boolean descriptive = event.getItemStack().is(Rivencraft.DESCRIPTIVE_BOOK.get());
+        if (!linking && !descriptive) return;
         event.setCanceled(true);
         event.setCancellationResult(InteractionResult.SUCCESS);
-        Minecraft.getInstance().setScreenAndShow(new PortLinkingBookScreen(
+        Minecraft.getInstance().setScreenAndShow(linking
-                event.getHand(), event.getItemStack().copy()));
+                ? new PortLinkingBookScreen(event.getHand(), event.getItemStack().copy())
+                : new PortDescriptiveBookScreen(event.getHand(), event.getItemStack().copy()));
     }
 }

ports/mc263/src/main/java/net/dnorberg/rivencraft/client/PortDescriptiveBookScreen.java

@@ -0,0 +1,116 @@
+package net.dnorberg.rivencraft.client;
+
+import com.mojang.blaze3d.platform.InputConstants;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.network.BindDescriptiveBookPayload;
+import net.dnorberg.rivencraft.network.PortBookNetworking;
+import net.dnorberg.rivencraft.network.UseDescriptiveBookPayload;
+import net.minecraft.client.gui.GuiGraphicsExtractor;
+import net.minecraft.client.gui.components.Button;
+import net.minecraft.client.gui.components.EditBox;
+import net.minecraft.client.gui.screens.Screen;
+import net.minecraft.client.input.MouseButtonEvent;
+import net.minecraft.client.renderer.RenderPipelines;
+import net.minecraft.network.chat.Component;
+import net.minecraft.resources.Identifier;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.item.ItemStack;
+import net.neoforged.neoforge.client.network.ClientPacketDistributor;
+
+/** Temporary 26.3 descriptive-book interaction; authored pages and live previews remain unported. */
+public final class PortDescriptiveBookScreen extends Screen {
+    private static final int WIDTH = 327;
+    private static final int HEIGHT = 199;
+    private static final int TEXT_COLOR = 0xFF3B281B;
+    private static final Identifier COVER = texture("bookui_cover.png");
+    private static final Identifier LEFT_PAGE = texture("notebook_pages.png");
+    private static final Identifier RIGHT_PANEL = texture("bookui_pager.png");
+
+    private final InteractionHand hand;
+    private final boolean bound;
+    private EditBox titleInput;
+
+    public PortDescriptiveBookScreen(InteractionHand hand, ItemStack book) {
+        super(book.getHoverName());
+        this.hand = hand;
+        bound = book.has(Rivencraft.AGE_BOOK_ID.get());
+    }
+
+    @Override
+    protected void init() {
+        if (bound) return;
+        int left = (width - WIDTH) / 2;
+        int top = (height - HEIGHT) / 2;
+        titleInput = new EditBox(font, left + 40, top + 69, 110, 20,
+                Component.literal("Age name"));
+        titleInput.setMaxLength(PortBookNetworking.MAX_BOOK_TITLE_LENGTH);
+        titleInput.setHint(Component.literal("Name this Age"));
+        addRenderableWidget(titleInput);
+        setInitialFocus(titleInput);
+        addRenderableWidget(Button.builder(Component.literal("Bind"), button -> bind())
+                .bounds(left + 40, top + 100, 53, 20).build());
+        addRenderableWidget(Button.builder(Component.literal("Cancel"), button -> onClose())
+                .bounds(left + 97, top + 100, 53, 20).build());
+    }
+
+    @Override
+    public void extractRenderState(GuiGraphicsExtractor graphics, int mouseX, int mouseY, float partialTick) {
+        int left = (width - WIDTH) / 2;
+        int top = (height - HEIGHT) / 2;
+        blit(graphics, COVER, left, top + 7, 34, 192, 152, 0);
+        blit(graphics, COVER, left + 34, top + 7, 103, 192, 49, 0);
+        blit(graphics, COVER, left + 137, top + 7, 4, 192, 45, 0);
+        blit(graphics, COVER, left + 141, top + 7, 186, 192, 0, 0);
+        blit(graphics, LEFT_PAGE, left + 7, top, 156, 195, 0, 0);
+        blit(graphics, RIGHT_PANEL, left + 163, top, 156, 195, 0, 0);
+        graphics.text(font, title, left + 42, top + 29, TEXT_COLOR, false);
+        if (bound) {
+            graphics.fill(left + 173, top + 20, left + 305, top + 103, 0xFF15141D);
+            graphics.text(font, Component.literal("Age preview unavailable"), left + 181, top + 47,
+                    0xFFE9DFCB, false);
+            graphics.text(font, Component.literal("Click to enter"), left + 205, top + 65,
+                    0xFFE9DFCB, false);
+        } else {
+            graphics.text(font, Component.literal("Bind a prototype Age"), left + 183, top + 39,
+                    TEXT_COLOR, false);
+        }
+        super.extractRenderState(graphics, mouseX, mouseY, partialTick);
+    }
+
+    @Override
+    public boolean mouseClicked(MouseButtonEvent event, boolean doubleClick) {
+        if (bound && event.button() == InputConstants.MOUSE_BUTTON_LEFT) {
+            int left = (width - WIDTH) / 2;
+            int top = (height - HEIGHT) / 2;
+            if (event.x() >= left + 173 && event.x() < left + 305
+                    && event.y() >= top + 20 && event.y() < top + 103) {
+                ClientPacketDistributor.sendToServer(new UseDescriptiveBookPayload(hand == InteractionHand.OFF_HAND));
+                onClose();
+                return true;
+            }
+        }
+        return super.mouseClicked(event, doubleClick);
+    }
+
+    @Override
+    public boolean isPauseScreen() {
+        return false;
+    }
+
+    private void bind() {
+        if (titleInput == null) return;
+        String name = titleInput.getValue().strip();
+        if (name.isEmpty()) return;
+        ClientPacketDistributor.sendToServer(new BindDescriptiveBookPayload(hand == InteractionHand.OFF_HAND, name));
+        onClose();
+    }
+
+    private static Identifier texture(String filename) {
+        return Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "textures/gui/" + filename);
+    }
+
+    private static void blit(GuiGraphicsExtractor graphics, Identifier texture, int x, int y,
+                             int width, int height, int u, int v) {
+        graphics.blit(RenderPipelines.GUI_TEXTURED, texture, x, y, u, v, width, height, 256, 256);
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/item/DescriptiveBookItem.java

@@ -2,10 +2,8 @@ package net.dnorberg.rivencraft.item;
 
 import java.util.function.Consumer;
 import net.dnorberg.rivencraft.Rivencraft;
-import net.dnorberg.rivencraft.age.PortAgeTravel;
 import net.minecraft.network.chat.Component;
 import net.minecraft.resources.Identifier;
-import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.player.Player;
@@ -15,7 +13,7 @@ import net.minecraft.world.item.TooltipFlag;
 import net.minecraft.world.item.component.TooltipDisplay;
 import net.minecraft.world.level.Level;
 
-/** First 26.3 bound-book slice; authoring and the book GUI still need porting. */
+/** Descriptive Book shell for the 26.3 prototype Age backend. */
 public final class DescriptiveBookItem extends Item {
     public DescriptiveBookItem(Properties properties) {
         super(properties);
@@ -28,18 +26,8 @@ public final class DescriptiveBookItem extends Item {
 
     @Override
     public InteractionResult use(Level level, Player player, InteractionHand hand) {
-        ItemStack stack = player.getItemInHand(hand);
+        // The client opens the GUI. Binding and travel are validated on the
-        Identifier id = stack.get(Rivencraft.AGE_BOOK_ID.get());
+        // server through dedicated packets; item use cannot bypass them.
-        if (id == null) {
-            if (player instanceof ServerPlayer serverPlayer) {
-                serverPlayer.sendOverlayMessage(Component.literal("Unbound Descriptive Book; use the port's Age book probe"));
-            }
-            return InteractionResult.SUCCESS;
-        }
-        if (player instanceof ServerPlayer serverPlayer) {
-            String failure = PortAgeTravel.enter(serverPlayer, id);
-            serverPlayer.sendOverlayMessage(Component.literal(failure == null ? "Entered " + id : failure));
-        }
         return InteractionResult.SUCCESS;
     }
 

ports/mc263/src/main/java/net/dnorberg/rivencraft/network/BindDescriptiveBookPayload.java

@@ -0,0 +1,22 @@
+package net.dnorberg.rivencraft.network;
+
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.Identifier;
+
+public record BindDescriptiveBookPayload(boolean offhand, String title) implements CustomPacketPayload {
+    public static final Type<BindDescriptiveBookPayload> TYPE = new Type<>(
+            Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "bind_descriptive_book"));
+    public static final StreamCodec<RegistryFriendlyByteBuf, BindDescriptiveBookPayload> STREAM_CODEC =
+            StreamCodec.composite(ByteBufCodecs.BOOL, BindDescriptiveBookPayload::offhand,
+                    ByteBufCodecs.stringUtf8(32), BindDescriptiveBookPayload::title,
+                    BindDescriptiveBookPayload::new);
+
+    @Override
+    public Type<BindDescriptiveBookPayload> type() {
+        return TYPE;
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/network/PortBookNetworking.java

@@ -1,16 +1,20 @@
 package net.dnorberg.rivencraft.network;
 
 import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.age.PortAgeTravel;
+import net.dnorberg.rivencraft.age.RuntimeAgeBackend;
 import net.dnorberg.rivencraft.item.LinkBookTarget;
 import net.dnorberg.rivencraft.item.LinkingBookItem;
 import net.minecraft.core.component.DataComponents;
 import net.minecraft.network.chat.Component;
+import net.minecraft.resources.Identifier;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.sounds.SoundEvents;
 import net.minecraft.sounds.SoundSource;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.item.ItemStack;
 import net.neoforged.neoforge.network.event.RegisterPayloadHandlersEvent;
+import java.util.Locale;
 
 /** Server-authoritative handheld Linking Book binding and travel. */
 public final class PortBookNetworking {
@@ -29,6 +33,14 @@ public final class PortBookNetworking {
                 (payload, context) -> {
                     if (context.player() instanceof ServerPlayer player) use(player, payload);
                 });
+        registrar.playToServer(BindDescriptiveBookPayload.TYPE, BindDescriptiveBookPayload.STREAM_CODEC,
+                (payload, context) -> {
+                    if (context.player() instanceof ServerPlayer player) bindAge(player, payload);
+                });
+        registrar.playToServer(UseDescriptiveBookPayload.TYPE, UseDescriptiveBookPayload.STREAM_CODEC,
+                (payload, context) -> {
+                    if (context.player() instanceof ServerPlayer player) enterAge(player, payload);
+                });
     }
 
     private static void bind(ServerPlayer player, BindLinkingBookPayload payload) {
@@ -51,6 +63,45 @@ public final class PortBookNetworking {
         if (failure != null) player.sendOverlayMessage(Component.literal(failure));
     }
 
+    private static void bindAge(ServerPlayer player, BindDescriptiveBookPayload payload) {
+        ItemStack stack = player.getItemInHand(hand(payload.offhand()));
+        if (!stack.is(Rivencraft.DESCRIPTIVE_BOOK.get()) || stack.has(Rivencraft.AGE_BOOK_ID.get())) return;
+        String title = payload.title().strip();
+        if (title.isEmpty() || title.length() > MAX_BOOK_TITLE_LENGTH) return;
+        String base = title.toLowerCase(Locale.ROOT).replaceAll("[^a-z0-9._-]+", "_")
+                .replaceAll("^[_\\.-]+|[_\\.-]+$", "");
+        if (base.isEmpty()) base = "age";
+        var server = player.level().getServer();
+        String name = base;
+        int suffix = 2;
+        Identifier id = Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "age/" + name);
+        while (RuntimeAgeBackend.isNameTaken(server, id)) {
+            name = base + "_" + suffix++;
+            id = Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "age/" + name);
+        }
+        try {
+            RuntimeAgeBackend.create(server, id, player.getRandom().nextLong());
+        } catch (IllegalArgumentException | IllegalStateException exception) {
+            player.sendOverlayMessage(Component.literal("Age creation failed: " + exception.getMessage()));
+            return;
+        }
+        stack.set(Rivencraft.AGE_BOOK_ID.get(), id);
+        stack.set(DataComponents.CUSTOM_NAME, Component.literal(title));
+        player.level().playSound(null, player.blockPosition(), SoundEvents.BOOK_PAGE_TURN,
+                SoundSource.PLAYERS, 1.0F, 1.0F);
+        player.sendOverlayMessage(Component.literal("Bound Descriptive Book: " + title));
+        player.containerMenu.broadcastChanges();
+    }
+
+    private static void enterAge(ServerPlayer player, UseDescriptiveBookPayload payload) {
+        ItemStack stack = player.getItemInHand(hand(payload.offhand()));
+        if (!stack.is(Rivencraft.DESCRIPTIVE_BOOK.get())) return;
+        Identifier id = stack.get(Rivencraft.AGE_BOOK_ID.get());
+        if (id == null) return;
+        String failure = PortAgeTravel.enter(player, id);
+        if (failure != null) player.sendOverlayMessage(Component.literal(failure));
+    }
+
     private static InteractionHand hand(boolean offhand) {
         return offhand ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND;
     }

ports/mc263/src/main/java/net/dnorberg/rivencraft/network/UseDescriptiveBookPayload.java

@@ -0,0 +1,21 @@
+package net.dnorberg.rivencraft.network;
+
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.Identifier;
+
+public record UseDescriptiveBookPayload(boolean offhand) implements CustomPacketPayload {
+    public static final Type<UseDescriptiveBookPayload> TYPE = new Type<>(
+            Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "use_descriptive_book"));
+    public static final StreamCodec<RegistryFriendlyByteBuf, UseDescriptiveBookPayload> STREAM_CODEC =
+            StreamCodec.composite(ByteBufCodecs.BOOL, UseDescriptiveBookPayload::offhand,
+                    UseDescriptiveBookPayload::new);
+
+    @Override
+    public Type<UseDescriptiveBookPayload> type() {
+        return TYPE;
+    }
+}