Add upsert interaction link command

src/commands/upsert-interaction-link-command.ts

@@ -0,0 +1,52 @@
+import { cloneInteractionLink } from "../interactions/interaction-links";
+import { createOpaqueId } from "../core/ids";
+
+import type { EditorCommand } from "./command";
+
+interface UpsertInteractionLinkCommandOptions {
+  link: ReturnType<typeof cloneInteractionLink>;
+  label?: string;
+}
+
+export function createUpsertInteractionLinkCommand(options: UpsertInteractionLinkCommandOptions): EditorCommand {
+  const nextLink = cloneInteractionLink(options.link);
+  let previousLink = null as typeof nextLink | null;
+
+  return {
+    id: createOpaqueId("command"),
+    label: options.label ?? "Update interaction link",
+    execute(context) {
+      const currentDocument = context.getDocument();
+      const currentLink = currentDocument.interactionLinks[nextLink.id];
+
+      if (previousLink === null && currentLink !== undefined) {
+        previousLink = cloneInteractionLink(currentLink);
+      }
+
+      context.setDocument({
+        ...currentDocument,
+        interactionLinks: {
+          ...currentDocument.interactionLinks,
+          [nextLink.id]: cloneInteractionLink(nextLink)
+        }
+      });
+    },
+    undo(context) {
+      const currentDocument = context.getDocument();
+      const nextInteractionLinks = {
+        ...currentDocument.interactionLinks
+      };
+
+      if (previousLink === null) {
+        delete nextInteractionLinks[nextLink.id];
+      } else {
+        nextInteractionLinks[nextLink.id] = cloneInteractionLink(previousLink);
+      }
+
+      context.setDocument({
+        ...currentDocument,
+        interactionLinks: nextInteractionLinks
+      });
+    }
+  };
+}