From 7488a6c0f5f9f7a40b377e1c10e8ce94fd94cbe8 Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Mon, 18 May 2026 16:08:48 +0200
Subject: [PATCH] auto-git:  [add]
 src/commands/update-custom-material-command.ts

---
 .../update-custom-material-command.ts         | 95 +++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 src/commands/update-custom-material-command.ts

diff --git a/src/commands/update-custom-material-command.ts b/src/commands/update-custom-material-command.ts
new file mode 100644
index 00000000..2cdc362c
--- /dev/null
+++ b/src/commands/update-custom-material-command.ts
@@ -0,0 +1,95 @@
+import { createOpaqueId } from "../core/ids";
+import {
+  cloneMaterialDef,
+  type CustomMaterialDef,
+  type CustomMaterialTextureRefs
+} from "../materials/starter-material-library";
+
+import type { EditorCommand } from "./command";
+
+type CustomMaterialUpdate = Partial<
+  Pick<
+    CustomMaterialDef,
+    | "name"
+    | "swatchColorHex"
+    | "tags"
+    | "albedoColorHex"
+    | "opacity"
+    | "roughness"
+    | "metallic"
+    | "normalStrength"
+  >
+> & {
+  textures?: CustomMaterialTextureRefs;
+};
+
+interface UpdateCustomMaterialCommandOptions {
+  materialId: string;
+  update: CustomMaterialUpdate;
+  label?: string;
+}
+
+export function createUpdateCustomMaterialCommand(
+  options: UpdateCustomMaterialCommandOptions
+): EditorCommand {
+  let previousMaterial: CustomMaterialDef | null = null;
+
+  return {
+    id: createOpaqueId("command"),
+    label: options.label ?? "Update custom material",
+    execute(context) {
+      const currentDocument = context.getDocument();
+      const currentMaterial = currentDocument.materials[options.materialId];
+
+      if (currentMaterial === undefined) {
+        throw new Error(`Material ${options.materialId} does not exist.`);
+      }
+
+      if (currentMaterial.kind !== "custom") {
+        throw new Error("Starter materials are read-only.");
+      }
+
+      if (previousMaterial === null) {
+        previousMaterial = cloneMaterialDef(currentMaterial) as CustomMaterialDef;
+      }
+
+      const nextAlbedoColorHex =
+        options.update.albedoColorHex ?? currentMaterial.albedoColorHex;
+      const nextMaterial: CustomMaterialDef = {
+        ...currentMaterial,
+        ...options.update,
+        swatchColorHex:
+          options.update.swatchColorHex ??
+          (options.update.albedoColorHex === undefined
+            ? currentMaterial.swatchColorHex
+            : nextAlbedoColorHex),
+        albedoColorHex: nextAlbedoColorHex,
+        tags: options.update.tags ?? currentMaterial.tags,
+        textures: options.update.textures ?? currentMaterial.textures
+      };
+
+      context.setDocument({
+        ...currentDocument,
+        materials: {
+          ...currentDocument.materials,
+          [options.materialId]: cloneMaterialDef(nextMaterial)
+        }
+      });
+    },
+    undo(context) {
+      if (previousMaterial === null) {
+        return;
+      }
+
+      const currentDocument = context.getDocument();
+
+      context.setDocument({
+        ...currentDocument,
+        materials: {
+          ...currentDocument.materials,
+          [options.materialId]: cloneMaterialDef(previousMaterial)
+        }
+      });
+    }
+  };
+}