/**
 * 分页循环请求直至拿全数据（接口需返回 { list, total }）。
 * 用于分类、单位、用户等列表接口，避免只取第一页导致下拉选项不全。
 */
/** 与后端 `/web/admin/*` 列表普遍 `Query(..., le=100)` 一致，超出会 422 */
export const MAX_ADMIN_LIST_PAGE_SIZE = 100

export async function fetchAllPagedRecords<T>(
  fetchPage: (page: number, pageSize: number) => Promise<{ list?: T[]; total?: number }>,
  options?: { pageSize?: number; maxPages?: number }
): Promise<T[]> {
  const requested = options?.pageSize ?? MAX_ADMIN_LIST_PAGE_SIZE
  const pageSize = Math.min(Math.max(1, requested), MAX_ADMIN_LIST_PAGE_SIZE)
  const maxPages = options?.maxPages ?? 50
  let page = 1
  const all: T[] = []
  let total = 0

  while (page <= maxPages) {
    const res = await fetchPage(page, pageSize)
    total = res.total ?? 0
    const list = res.list ?? []
    all.push(...list)
    if (list.length === 0 || all.length >= total || list.length < pageSize) break
    page += 1
  }

  return all
}