Recognize imported furniture by normalized classname and local IDs

src/lib/furni/local-presence.ts

@@ -0,0 +1,29 @@
+import { normalizeClassname } from "./classname";
+
+export function indexLocalFurniture<T extends { id: number; itemName: string }>(
+	rows: T[],
+) {
+	const index = new Map<string, T[]>();
+	for (const row of rows) {
+		const key = normalizeClassname(row.itemName);
+		const matches = index.get(key) ?? [];
+		matches.push(row);
+		index.set(key, matches);
+	}
+	return index;
+}
+export function localFurnitureStatus(
+	classname: string,
+	local: Map<string, Array<{ id: number; itemName: string }>>,
+	furnidata: Set<string>,
+	catalogIds: Set<number>,
+) {
+	const key = normalizeClassname(classname);
+	const rows = local.get(key) ?? [];
+	return {
+		alreadyImported: rows.length > 0,
+		localId: rows.length === 1 ? rows[0].id : undefined,
+		hasFurnidata: furnidata.has(key),
+		hasCatalogEntry: rows.some((row) => catalogIds.has(row.id)),
+	};
+}