feat: add currently_reading and read and repsonsive menu

layers/wishlist/server/utils/shelf.ts

@@ -0,0 +1,46 @@
+import type { H3Event } from 'h3'
+
+interface LinkValue {
+  value: string | null
+}
+
+export interface ShelfBookRow {
+  id: number
+  title: string | null
+  title_german: string | null
+  authors: LinkValue[]
+}
+
+interface Field {
+  name: string
+  link_row_table_id?: number
+}
+
+let booksTable: string | null = null
+
+/** The books table, taken from the wishlist table's `books` link field. */
+export async function wishlistBooksTable(event: H3Event): Promise<string> {
+  if (!booksTable) {
+    const fields = await listFields<Field>(event, wishlistTable(event))
+    const id = fields.find(field => field.name === 'books')?.link_row_table_id
+    if (!id) {
+      throw createError({ statusCode: 500, statusMessage: 'The wishlist table has no "books" link field' })
+    }
+    booksTable = String(id)
+  }
+  return booksTable
+}
+
+export function toShelfBook(row: ShelfBookRow): WishlistShelfBook {
+  return {
+    id: row.id,
+    title: row.title_german?.trim() || (row.title ?? '').trim(),
+    authors: (row.authors ?? []).map(({ value }) => value?.trim()).filter((value): value is string => !!value)
+  }
+}
+
+/** Books from the books table matching a Baserow filter, e.g. `{ filter__read__boolean: true }` */
+export async function listShelfBooks(event: H3Event, filters: Record<string, unknown>): Promise<WishlistShelfBook[]> {
+  const rows = await listRows<ShelfBookRow>(event, await wishlistBooksTable(event), filters)
+  return rows.map(toShelfBook).filter(book => book.title)
+}