import { readItems, readPage, readPageSize, readTotalCount } from "@/api/paginated-response-fields";

export interface PaginatedResult<T> {
  items: T[];
  totalCount: number;
  page: number;
  pageSize: number;
}

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}

export function handleApiResponse<T>(data: unknown): T {
  if (Array.isArray(data)) {
    return data as T;
  }

  if (isRecord(data)) {
    const nested = data.data ?? data.Data ?? data.value;
    if (nested !== undefined) {
      return nested as T;
    }
  }

  return data as T;
}

export function handlePaginatedResponse<T>(
  data: unknown,
  params?: { page?: number; pageSize?: number },
): PaginatedResult<T> {
  const page = params?.page ?? 1;
  const pageSize = params?.pageSize ?? 12;

  if (Array.isArray(data)) {
    return {
      items: data as T[],
      totalCount: data.length,
      page,
      pageSize,
    };
  }

  if (isRecord(data)) {
    const items = readItems<T>(data);

    return {
      items,
      totalCount: readTotalCount(data, items.length),
      page: readPage(data, page),
      pageSize: readPageSize(data, pageSize),
    };
  }

  return {
    items: [],
    totalCount: 0,
    page,
    pageSize,
  };
}