add: local wishlists stored in local storage for anonymous users

src/lib/utils/localWishlists.ts

@@ -0,0 +1,103 @@
+/**
+ * Utility functions for managing anonymous user's wishlists in localStorage
+ */
+
+const LOCAL_WISHLISTS_KEY = 'local_wishlists';
+
+export interface LocalWishlist {
+	ownerToken: string;
+	publicToken: string;
+	title: string;
+	createdAt: string;
+	isFavorite?: boolean;
+}
+
+/**
+ * Get all local wishlists from localStorage
+ */
+export function getLocalWishlists(): LocalWishlist[] {
+	if (typeof window === 'undefined') return [];
+
+	try {
+		const stored = localStorage.getItem(LOCAL_WISHLISTS_KEY);
+		return stored ? JSON.parse(stored) : [];
+	} catch (error) {
+		console.error('Failed to parse local wishlists:', error);
+		return [];
+	}
+}
+
+/**
+ * Add a wishlist to localStorage
+ */
+export function addLocalWishlist(wishlist: LocalWishlist): void {
+	if (typeof window === 'undefined') return;
+
+	try {
+		const wishlists = getLocalWishlists();
+
+		// Check if already exists
+		const exists = wishlists.some(w => w.ownerToken === wishlist.ownerToken);
+		if (exists) return;
+
+		wishlists.push(wishlist);
+		localStorage.setItem(LOCAL_WISHLISTS_KEY, JSON.stringify(wishlists));
+	} catch (error) {
+		console.error('Failed to add local wishlist:', error);
+	}
+}
+
+/**
+ * Remove a wishlist from localStorage (forget it)
+ */
+export function forgetLocalWishlist(ownerToken: string): void {
+	if (typeof window === 'undefined') return;
+
+	try {
+		const wishlists = getLocalWishlists();
+		const filtered = wishlists.filter(w => w.ownerToken !== ownerToken);
+		localStorage.setItem(LOCAL_WISHLISTS_KEY, JSON.stringify(filtered));
+	} catch (error) {
+		console.error('Failed to forget local wishlist:', error);
+	}
+}
+
+/**
+ * Clear all local wishlists (e.g., when user claims all wishlists)
+ */
+export function clearLocalWishlists(): void {
+	if (typeof window === 'undefined') return;
+
+	try {
+		localStorage.removeItem(LOCAL_WISHLISTS_KEY);
+	} catch (error) {
+		console.error('Failed to clear local wishlists:', error);
+	}
+}
+
+/**
+ * Check if a wishlist is in local storage
+ */
+export function isLocalWishlist(ownerToken: string): boolean {
+	const wishlists = getLocalWishlists();
+	return wishlists.some(w => w.ownerToken === ownerToken);
+}
+
+/**
+ * Toggle favorite status for a local wishlist
+ */
+export function toggleLocalFavorite(ownerToken: string): void {
+	if (typeof window === 'undefined') return;
+
+	try {
+		const wishlists = getLocalWishlists();
+		const updated = wishlists.map(w =>
+			w.ownerToken === ownerToken
+				? { ...w, isFavorite: !w.isFavorite }
+				: w
+		);
+		localStorage.setItem(LOCAL_WISHLISTS_KEY, JSON.stringify(updated));
+	} catch (error) {
+		console.error('Failed to toggle local wishlist favorite:', error);
+	}
+}