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package com.quhaodian.data.core;

import java.io.Serializable;

/**
 * 简单分页类
 */
public class SimplePage implements Paginable, Serializable {
  private static final long serialVersionUID = 1L;
  public static final int DEF_COUNT = 20;

  /**
   * 检查页码 checkPageNo
   *
   * @param pageNo
   * @return 页码
   */
  public static int cpn(Integer pageNo) {
    return (pageNo == null || pageNo < 1) ? 1 : pageNo;
  }

  public SimplePage() {
  }

  /**
   * 构造器
   *
   * @param pageNo     页码
   * @param pageSize   每页几条数据
   * @param totalCount 总共几条数据
   */
  public SimplePage(int pageNo, int pageSize, int totalCount) {
    setTotalCount(totalCount);
    setPageSize(pageSize);
    setPageNo(pageNo);
    adjustPageNo();
  }

  /**
   * 调整页码，使不超过最大页数
   */
  public void adjustPageNo() {
    if (pageNo == 1) {
      return;
    }
    int tp = getTotalPage();
    if (pageNo > tp) {
      pageNo = tp;
    }
  }

  /**
   * 获得页码
   */
  public int getPageNo() {
    return pageNo;
  }

  /**
   * 每页几条数据
   */
  public int getPageSize() {
    return pageSize;
  }

  /**
   * 总共几条数据
   */
  public int getTotalCount() {
    return totalCount;
  }

  /**
   * 总共几页
   */
  public int getTotalPage() {
    int totalPage = totalCount / pageSize;
    if (totalPage == 0 || totalCount % pageSize != 0) {
      totalPage++;
    }
    return totalPage;
  }

  /**
   * 是否第一页
   */
  public boolean isFirstPage() {
    return pageNo <= 1;
  }

  /**
   * 是否最后一页
   */
  public boolean isLastPage() {
    return pageNo >= getTotalPage();
  }

  /**
   * 下一页页码
   */
  public int getNextPage() {
    if (isLastPage()) {
      return pageNo;
    } else {
      return pageNo + 1;
    }
  }

  /**
   * 上一页页码
   */
  public int getPrePage() {
    if (isFirstPage()) {
      return pageNo;
    } else {
      return pageNo - 1;
    }
  }

  protected int totalCount = 0;
  protected int pageSize = 20;
  protected int pageNo = 1;

  /**
   * 设置总量
   *
   * @param totalCount
   */
  public void setTotalCount(int totalCount) {
    if (totalCount < 0) {
      this.totalCount = 0;
    } else {
      this.totalCount = totalCount;
    }
  }

  /**
   * 设置分页大小
   *
   * @param pageSize
   */
  public void setPageSize(int pageSize) {
    if (pageSize < 1) {
      this.pageSize = DEF_COUNT;
    } else {
      this.pageSize = pageSize;
    }
  }

  /**
   * 设置页码
   *
   * @param pageNo
   */
  public void setPageNo(int pageNo) {
    if (pageNo < 1) {
      this.pageNo = 1;
    } else {
      this.pageNo = pageNo;
    }
  }
}