package com.senmesh.tkmybatis.pojo;

import com.senmesh.common.dto.IPage;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;

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

/**
 * 分页
 *
 * @author guhong
 * @date 2019/8/19
 */
@Data
@AllArgsConstructor
@Builder
public class Page<T> implements Serializable, IPage<T> {

  /**  **/
  private static final long serialVersionUID = -729078966440672920L;
  
  /** 第几页 **/
  private int pageNo;
  /** 页宽 **/
  private int pageSize;
  /** 一共的页数 **/
  private int pageCount;
  /** 记录条数 **/
  private int totalCount;
  /** 查询出来的对象实体 **/
  private List<T> entityList;

  public Page() {
    pageSize = 20;
    pageNo = 1;
  }

  public Page(int pageNo, int pageSize) {
    super();
    this.pageNo = pageNo < 1 ? 1 : pageNo;
    this.pageSize = pageSize < 1 ? 20 : pageSize;
  }

  public void setTotalCount(int totalCount) {
    pageCount = (int) Math.ceil((double) totalCount / pageSize);
    this.totalCount = totalCount;
  }

  public int getFirstEntityIndex() {
    return (pageNo - 1) * pageSize;
  }

  @Override
  public Integer getPageNo() {
    return pageNo;
  }

  @Override
  public Integer getPageSize() {
    return pageSize;
  }

  @Override
  public void setPageResult(int totalCount, List<T> results) {
    this.entityList = results;
    this.setTotalCount(totalCount);
  }


  @Override
  public Boolean getNeedPage() {
    return true;
  }

}