package com.zd.model.page;

import org.apache.commons.lang3.StringUtils;

import java.util.Optional;

/**
 * 分页数据
 *
 * @author zd
 */
public class PageDomain {
    /**
     * 当前记录起始索引
     */
    private Integer pageNum;

    /**
     * 每页显示记录数
     */
    private Integer pageSize;

    /**
     * 排序列
     */
    private String orderByColumn;

    /**
     * 排序的方向desc或者asc
     */
    private String isAsc = "asc";

    public String getOrderBy() {
        if (orderByColumn == null || "".equals(orderByColumn)) {
            return "";
        }
        return toUnderScoreCase(orderByColumn) + " " + isAsc;
    }

    public Integer getPageNum() {
        return Optional.ofNullable(pageNum).orElse(1);
    }

    public void setPageNum(Integer pageNum) {
        this.pageNum = pageNum;
    }

    public Integer getPageSize() {
        return Optional.ofNullable(pageSize).orElse(10);
    }

    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

    public String getOrderByColumn() {
        return orderByColumn;
    }

    public void setOrderByColumn(String orderByColumn) {
        this.orderByColumn = orderByColumn;
    }

    public String getIsAsc() {
        return isAsc;
    }

    public void setIsAsc(String isAsc) {
        if (StringUtils.isNotEmpty(isAsc)) {
            // 兼容前端排序类型
            if ("ascending".equals(isAsc)) {
                isAsc = "asc";
            } else if ("descending".equals(isAsc)) {
                isAsc = "desc";
            }
            this.isAsc = isAsc;
        }
    }

    private static String toUnderScoreCase(String str) {
        if (str == null) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        // 前置字符是否大写
        boolean preCharIsUpperCase = true;
        // 当前字符是否大写
        boolean curreCharIsUpperCase = true;
        // 下一字符是否大写
        boolean nexteCharIsUpperCase = true;
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            if (i > 0) {
                preCharIsUpperCase = Character.isUpperCase(str.charAt(i - 1));
            } else {
                preCharIsUpperCase = false;
            }
            curreCharIsUpperCase = Character.isUpperCase(c);
            if (i < (str.length() - 1)) {
                nexteCharIsUpperCase = Character.isUpperCase(str.charAt(i + 1));
            }
            if (preCharIsUpperCase && curreCharIsUpperCase && !nexteCharIsUpperCase) {
                sb.append('_');
            } else if ((i != 0 && !preCharIsUpperCase) && curreCharIsUpperCase) {
                sb.append('_');
            }
            sb.append(Character.toLowerCase(c));
        }
        return sb.toString();
    }
}