interface LinkValue {
  value: string | null
}

export interface DiaryBookRow {
  id: number
  title: string | null
  title_german: string | null
  authors: LinkValue[]
  read_date: string | null
}

export function toDiaryBook(row: DiaryBookRow): DiaryBook {
  const original = (row.title ?? '').trim()
  return {
    id: row.id,
    title: row.title_german?.trim() || original,
    originalTitle: original,
    authors: lookupValues(row.authors),
    readDate: row.read_date || null
  }
}