import { useState, useMemo,useEffect } from "react";

const usePagination = (data, itemsPerPage) => {
  const [currentPage, setCurrentPage] = useState(1);

  // const totalPages = Math.ceil(data?.length / itemsPerPage);

// add this new line
   const totalPages = useMemo(() => {
    return Math.ceil((data?.length || 0) / itemsPerPage);
  }, [data?.length, itemsPerPage]);

  useEffect(() => {
    if (currentPage > totalPages && totalPages > 0) {
      setCurrentPage(1);
    } else if (!data || data.length === 0) {
      setCurrentPage(1);
    } else if (currentPage === 0 && totalPages > 0) {
        setCurrentPage(1);
    }
  }, [data, totalPages, currentPage]);

  const currentItems = useMemo(() => {
    const startIndex = (currentPage - 1) * itemsPerPage;

    // return data?.slice(startIndex, startIndex + itemsPerPage);
    return data?.slice(startIndex, startIndex + itemsPerPage) || [];
    
  }, [data, currentPage, itemsPerPage]);

  const paginate = (pageNumber) => {
    if (pageNumber < 1 || pageNumber > totalPages) return;
    setCurrentPage(pageNumber);
  };

  return { currentPage, totalPages, currentItems, paginate,setCurrentPage };
};

export default usePagination;