/**
 * 新增时默认排序号：当前列表中最大 sortOrder + 1；无任何数据时为 0。
 * 依赖列表接口按 sort_order 升序分页（最后一页含最大排序号）。
 */
import { MAX_ADMIN_LIST_PAGE_SIZE } from '@/utils/fetch-paged-list'

export async function fetchNextSortOrder(
  fetchList: (params: {
    page: number
    pageSize: number
    keyword?: string
    isActive?: boolean | number | string | undefined
  }) => Promise<{ list: { sortOrder?: number }[]; total: number }>,
  options?: { pageSize?: number }
): Promise<number> {
  const requested = options?.pageSize ?? MAX_ADMIN_LIST_PAGE_SIZE
  const pageSize = Math.min(Math.max(1, requested), MAX_ADMIN_LIST_PAGE_SIZE)
  const first = await fetchList({ page: 1, pageSize })
  const total = first.total ?? 0
  if (total === 0) return 0
  const lastPage = Math.ceil(total / pageSize)
  const res = lastPage <= 1 ? first : await fetchList({ page: lastPage, pageSize })
  const list = res.list ?? []
  const nums = list.map((r) => {
    const n = Number(r.sortOrder)
    return Number.isFinite(n) ? n : 0
  })
  return (nums.length ? Math.max(...nums) : 0) + 1
}