From 64a5056257a7722e3480b439d381eb985af7c33f Mon Sep 17 00:00:00 2001
From: ABKQPO <93412322+ABKQPO@users.noreply.github.com>
Date: Thu, 10 Sep 2026 18:35:17 +0800
Subject: [PATCH] Add a creative fluid source for guide scenes

Scenes build with a creative item source, and now with a creative fluid source as well.

* A multiblock that wants water is shown complete instead of with an empty water position.
* The existing fallback to a creative construct when survival placement makes no progress is unchanged.
* Requires StructureLib 1.4.44.
---
 dependencies.gradle                           |  4 +--
 .../structurelib/CreativeFluidSource.java     | 26 +++++++++++++++++++
 .../StructureLibBuildService.java             |  3 ++-
 3 files changed, 30 insertions(+), 3 deletions(-)
 create mode 100644 src/main/java/com/hfstudio/guidenh/integration/structurelib/CreativeFluidSource.java

diff --git a/dependencies.gradle b/dependencies.gradle
index 3f56da0a..d32b7471 100644
--- a/dependencies.gradle
+++ b/dependencies.gradle
@@ -17,7 +17,7 @@ dependencies {
     shadowImplementation("org.eclipse.elk:org.eclipse.elk.alg.layered:0.11.0")
     shadowImplementation("org.eclipse.xtext:org.eclipse.xtext.xbase.lib:2.36.0")
 
-    devOnlyNonPublishable("com.github.GTNewHorizons:StructureLib:1.4.42:dev")
+    devOnlyNonPublishable("com.github.GTNewHorizons:StructureLib:1.4.44:dev")
     devOnlyNonPublishable("com.github.GTNewHorizons:GT5-Unofficial:5.09.54.36:dev")
     devOnlyNonPublishable("com.github.GTNewHorizons:NotEnoughItems:2.8.128-GTNH:dev")
     devOnlyNonPublishable("com.github.GTNewHorizons:Applied-Energistics-2-Unofficial:rv3-beta-1045-GTNH:dev")
@@ -61,7 +61,7 @@ dependencies {
     annotationProcessor("com.google.auto.value:auto-value:1.10.4")
 
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.12.2")
-    testImplementation("com.github.GTNewHorizons:StructureLib:1.4.42:dev")
+    testImplementation("com.github.GTNewHorizons:StructureLib:1.4.44:dev")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.12.2")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.12.2")
 }
diff --git a/src/main/java/com/hfstudio/guidenh/integration/structurelib/CreativeFluidSource.java b/src/main/java/com/hfstudio/guidenh/integration/structurelib/CreativeFluidSource.java
new file mode 100644
index 00000000..325b430d
--- /dev/null
+++ b/src/main/java/com/hfstudio/guidenh/integration/structurelib/CreativeFluidSource.java
@@ -0,0 +1,26 @@
+package com.hfstudio.guidenh.integration.structurelib;
+
+import net.minecraftforge.fluids.FluidStack;
+
+import javax.annotation.Nonnull;
+
+import com.gtnewhorizon.structurelib.fluid.IFluidSource;
+
+/**
+ * A fluid source that always holds as much of the requested fluid as asked for.
+ * <p>
+ * Guide book scenes are built with a creative item source, and this is its fluid counterpart: it lets a scene fill the
+ * positions a multiblock wants a fluid at, e.g. the water an ore washing plant needs, without anybody having to carry
+ * that fluid.
+ */
+public class CreativeFluidSource implements IFluidSource {
+
+    public static final CreativeFluidSource instance = new CreativeFluidSource();
+
+    @Nonnull
+    @Override
+    public FluidStack take(FluidStack resource, boolean simulate) {
+        if (resource == null || resource.getFluid() == null) throw new IllegalArgumentException();
+        return new FluidStack(resource, resource.amount);
+    }
+}
diff --git a/src/main/java/com/hfstudio/guidenh/integration/structurelib/StructureLibBuildService.java b/src/main/java/com/hfstudio/guidenh/integration/structurelib/StructureLibBuildService.java
index c8e5fd08..3b452d9d 100644
--- a/src/main/java/com/hfstudio/guidenh/integration/structurelib/StructureLibBuildService.java
+++ b/src/main/java/com/hfstudio/guidenh/integration/structurelib/StructureLibBuildService.java
@@ -171,7 +171,8 @@ private static void buildStructure(IConstructable constructable, ItemStack trigg
         boolean useSurvival = constructable instanceof ISurvivalConstructable;
         if (useSurvival) {
             ISurvivalConstructable sc = (ISurvivalConstructable) constructable;
-            ISurvivalBuildEnvironment env = ISurvivalBuildEnvironment.create(createItemSource(), fakePlayer);
+            ISurvivalBuildEnvironment env = ISurvivalBuildEnvironment
+                .create(createItemSource(), CreativeFluidSource.instance, fakePlayer);
             int rounds = 0;
             while (rounds++ < SURVIVAL_MAX_ROUNDS) {
                 int result = sc.survivalConstruct(trigger, SURVIVAL_BUDGET, env);