import { computed, ref } from 'vue';

export function usePagination(initialConfig) {
  const currentPage = ref(initialConfig.currentPage);
  const pageSize = ref(initialConfig.pageSize);
  const totalItems = ref(initialConfig.totalItems);

  const totalPages = computed(() => Math.ceil(totalItems.value / pageSize.value));

  const startIndex = computed(() => (currentPage.value - 1) * pageSize.value);

  const endIndex = computed(() => Math.min(startIndex.value + pageSize.value, totalItems.value));

  const hasNextPage = computed(() => currentPage.value < totalPages.value);

  const hasPreviousPage = computed(() => currentPage.value > 1);

  const goToPage = (page) => {
    if (page >= 1 && page <= totalPages.value) {
      currentPage.value = page;
    }
  };

  const nextPage = () => {
    if (hasNextPage.value) {
      currentPage.value++;
    }
  };

  const previousPage = () => {
    if (hasPreviousPage.value) {
      currentPage.value--;
    }
  };

  const setPageSize = (size) => {
    pageSize.value = size;
    currentPage.value = 1;
  };

  const updateTotalItems = (total) => {
    totalItems.value = total;
  };

  return {
    currentPage,
    pageSize,
    totalItems,
    totalPages,
    startIndex,
    endIndex,
    hasNextPage,
    hasPreviousPage,
    goToPage,
    nextPage,
    previousPage,
    setPageSize,
    updateTotalItems,
  };
}