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package top.remliyx.dbeasy.utils.page;

import java.io.Serializable;
import java.util.List;

/**
 * 文件说明：分页工具类
 * 创建作者: 李宜栩
 * 创建日期: 2023-4-24
 * 版权所有：lyx
 * 版本：    Version 1.0
 */
public class PagerUtils implements Serializable {

    /**
     *
     */
    private static final long serialVersionUID = 4542617637761955078L;

    /**
     * currentPage 当前页
     */
    private int currentPage = 1;
    /**
     * pageSize 每页大小
     */
    private int pageSize = 100;
    /**
     * pageTotal 总页数
     */
    private int pageTotal;
    /**
     * recordTotal 总条数
     */
    private int recordTotal = 0;
    /**
     * previousPage 前一页
     */
    private int previousPage;
    /**
     * nextPage 下一页
     */
    private int nextPage;
    /**
     * firstPage 第一页
     */
    private int firstPage = 1;
    /**
     * lastPage 最后一页
     */
    private int lastPage;

    /**
     * content 每页的内容
     */
    private List content;

    public PagerUtils(int currentPage, int pageSize) {
        this.currentPage = currentPage;
        this.pageSize = pageSize;
    }

    /**
     * 获取起始偏移量
     *
     * @return 偏移量
     */
    public int fromIndex() {
        return (pageSize * (currentPage - 1));
    }

    /**
     * 获取结束偏移量
     *
     * @return 结束偏移量
     */
    public int toIndex() {
        return pageSize * currentPage > getRecordTotal() ? getRecordTotal() : (pageSize * currentPage);
    }

    // 以下set方式是需要赋值的

    /**
     * 设置当前页 

     *
     * @param currentPage
     * @author kangxu
     */
    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    /**
     * 设置每页大小,也可以不用赋值,默认大小为10条 

     *
     * @param pageSize
     * @author kangxu
     */
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    /**
     * 设置总条数,默认为0 

     *
     * @param recordTotal
     * @author kangxu
     */
    public void setRecordTotal(int recordTotal) {
        this.recordTotal = recordTotal;
        otherAttr();
    }

    /**
     * 设置分页内容 

     *
     * @param content
     * @author kangxu
     */
    public void setContent(List content) {
        this.content = content;
    }

    /**
     * 设置其他参数
     *
     * @author kangxu
     */
    public void otherAttr() {
        // 总页数
        this.pageTotal = this.recordTotal % this.pageSize > 0 ? this.recordTotal / this.pageSize + 1 : this.recordTotal / this.pageSize;
        // 第一页
        this.firstPage = 1;
        // 最后一页
        this.lastPage = this.pageTotal;
        // 前一页
        if (this.currentPage > 1) {
            this.previousPage = this.currentPage - 1;
        } else {
            this.previousPage = this.firstPage;
        }
        // 下一页
        if (this.currentPage < this.lastPage) {
            this.nextPage = this.currentPage + 1;
        } else {
            this.nextPage = this.lastPage;
        }
    }

    // 放开私有属性
    public int getCurrentPage() {
        return currentPage;
    }

    public int getPageSize() {
        return pageSize;
    }

    public int getPageTotal() {
        return pageTotal;
    }

    public int getRecordTotal() {
        return recordTotal;
    }

    public int getPreviousPage() {
        return previousPage;
    }

    public int getNextPage() {
        return nextPage;
    }

    public int getFirstPage() {
        return firstPage;
    }

    public int getLastPage() {
        return lastPage;
    }

    public List getContent() {
        return content;
    }

    @Override
    public String toString() {
        return "Pager [currentPage=" + currentPage + ", pageSize=" + pageSize
                + ", pageTotal=" + pageTotal + ", recordTotal=" + recordTotal
                + ", previousPage=" + previousPage + ", nextPage=" + nextPage
                + ", firstPage=" + firstPage + ", lastPage=" + lastPage
                + ", content=" + content + "]";
    }


}