export function Paginate(
  totalItems: number,
  currentPage: number = 1,
  pageSize: number = 10,
  maxPages: number = 10,
) {
  let totalPages = Math.ceil(totalItems / pageSize);
  if (currentPage < 1) {
    currentPage = 1;
  } else if (currentPage > totalPages) {
    currentPage = totalPages;
  }
  let startPage: number, endPage: number;
  if (totalPages <= maxPages) {
    startPage = 1;
    endPage = totalPages;
  } else {
    let maxPagesBeforeCurrentPage = Math.floor(maxPages / 2);
    let maxPagesAfterCurrentPage = Math.ceil(maxPages / 2) - 1;
    if (currentPage <= maxPagesBeforeCurrentPage) {
      startPage = 1;
      endPage = maxPages;
    } else if (currentPage + maxPagesAfterCurrentPage >= totalPages) {
      startPage = totalPages - maxPages + 1;
      endPage = totalPages;
    } else {
      startPage = currentPage - maxPagesBeforeCurrentPage;
      endPage = currentPage + maxPagesAfterCurrentPage;
    }
  }
  let startIndex = (currentPage - 1) * pageSize;
  let endIndex = Math.min(startIndex + pageSize - 1, totalItems - 1);
  let pages = Array.from(Array(endPage + 1 - startPage).keys()).map(
    i => startPage + i,
  );
  return {
    totalItems: totalItems,
    currentPage: currentPage,
    pageSize: pageSize,
    totalPages: totalPages,
    startPage: startPage,
    endPage: endPage,
    startIndex: startIndex,
    endIndex: endIndex,
    pages: pages,
  };
}