refactor: convert wishlist creation from API to form action

src/routes/+page.server.ts

@@ -1,4 +1,9 @@
-import type { PageServerLoad } from './$types';
+import type { PageServerLoad, Actions } from './$types';
+import { db } from '$lib/server/db';
+import { wishlists } from '$lib/db/schema';
+import { createId } from '@paralleldrive/cuid2';
+import { fail } from '@sveltejs/kit';
+import { wishlistSchema } from '$lib/server/validation';
 
 export const load: PageServerLoad = async (event) => {
   const session = await event.locals.auth();
@@ -6,3 +11,39 @@ export const load: PageServerLoad = async (event) => {
     session
   };
 };
+
+export const actions: Actions = {
+  createWishlist: async ({ request, locals }) => {
+    const formData = await request.formData();
+    const rawData = Object.fromEntries(formData);
+
+    const result = wishlistSchema.safeParse(rawData);
+    if (!result.success) {
+      return fail(400, { success: false, error: result.error.errors.map(e => e.message).join(', ') });
+    }
+
+    const session = await locals.auth();
+    const userId = session?.user?.id || null;
+
+    const ownerToken = createId();
+    const publicToken = createId();
+
+    const [wishlist] = await db
+      .insert(wishlists)
+      .values({
+        ...result.data,
+        ownerToken,
+        publicToken,
+        userId
+      })
+      .returning();
+
+    return {
+      success: true,
+      ownerToken,
+      publicToken,
+      title: wishlist.title,
+      createdAt: wishlist.createdAt
+    };
+  }
+};