import { unwrapApiPayload } from './usAppApiRequest'

/** 解析分页 JSON：兼容 items / Items、camelCase / PascalCase、ABP 包装 */
export function extractPagedItems<T>(responseBody: unknown): {
  items: T[]
  totalCount: number
  pageIndex: number
  pageSize: number
} {
  const raw = unwrapApiPayload<Record<string, unknown>>(responseBody)
  if (raw == null || typeof raw !== 'object') {
    return { items: [], totalCount: 0, pageIndex: 1, pageSize: 0 }
  }
  const itemsRaw = raw.items ?? raw.Items
  const items = Array.isArray(itemsRaw) ? (itemsRaw as T[]) : []
  const totalCount = Number(raw.totalCount ?? raw.TotalCount ?? items.length) || 0
  const pageIndex = Number(raw.pageIndex ?? raw.PageIndex ?? 1) || 1
  const pageSize = Number(raw.pageSize ?? raw.PageSize ?? items.length) || 0
  return { items, totalCount, pageIndex, pageSize }
}