class VirtualPagination {
    constructor(data, itemsPerPage = 10) {
        console.log(data);
      this.originalData = data;
      this.currentData = [...data];
      this.itemsPerPage = itemsPerPage;
      this.currentPage = 1;
      this.totalPages = Math.ceil(data.length / itemsPerPage);
    }

    // 获取当前页数据
    getCurrentPageData() {
      const start = (this.currentPage - 1) * this.itemsPerPage;
      const end = start + this.itemsPerPage;

      return this.currentData.slice(start, end);
    }

    // 跳转到指定页
    goToPage(page) {
        console.log(page,'this.totalPages',this.totalPages);
      if (page >= 1 && page <= this.totalPages) {
        this.currentPage = page;
        return this.getCurrentPageData();
      }else{
        return;
      }
      
    }

    // 上一页
    prevPage() {
      return this.goToPage(this.currentPage - 1);
    }

    // 下一页
    nextPage() {
      return this.goToPage(this.currentPage + 1);
    }

    // 设置每页显示数量
    setItemsPerPage(count) {
      this.itemsPerPage = count;
      this.totalPages = Math.ceil(this.currentData.length / count);
      this.currentPage = 1; // 重置到第一页
    }

    // 过滤数据
    filterData(filterFn) {
      this.currentData = this.originalData.filter(filterFn);
      this.totalPages = Math.ceil(this.currentData.length / this.itemsPerPage);
      this.currentPage = 1; // 重置到第一页
      return this.getCurrentPageData();
    }

    // 排序数据
    sortData(compareFn) {
      this.currentData = [...this.originalData].sort(compareFn);
      return this.getCurrentPageData();
    }
  }

  export { VirtualPagination };