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 nested = data.data ?? data.Data ?? data.value;
    const itemsFromPaged =
      (Array.isArray(data.items) ? (data.items as T[]) : undefined) ??
      (Array.isArray(data.Items) ? (data.Items as T[]) : undefined);
    const items = itemsFromPaged ?? (Array.isArray(nested) ? (nested as T[]) : []);

    const totalCount =
      (typeof data.totalCount === "number" ? data.totalCount : undefined) ??
      (typeof data.TotalCount === "number" ? data.TotalCount : undefined) ??
      (typeof data.Count === "number" ? data.Count : undefined) ??
      items.length;

    return {
      items,
      totalCount,
      page:
        (typeof data.page === "number" ? data.page : undefined) ??
        (typeof data.pageNumber === "number" ? data.pageNumber : undefined) ??
        (typeof data.PageNumber === "number" ? data.PageNumber : undefined) ??
        page,
      pageSize:
        (typeof data.pageSize === "number" ? data.pageSize : undefined) ??
        (typeof data.PageSize === "number" ? data.PageSize : undefined) ??
        pageSize,
    };
  }

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