package com.gyjiot.common.core.page;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjectUtil;
import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.gyjiot.common.exception.ServiceException;
import com.gyjiot.common.utils.StringUtils;
import com.gyjiot.common.utils.sql.SqlUtil;

import java.util.ArrayList;
import java.util.List;

/**
 * 分页数据
 * 
 * @author ruoyi
 */
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";

    /** 分页参数合理化 */
    private Boolean reasonable = true;

    /**
     * 当前记录起始索引 默认值
     */
    public static final int DEFAULT_PAGE_NUM = 1;

    /**
     * 每页显示记录数 默认值 默认查全部
     */
    public static final int DEFAULT_PAGE_SIZE = Integer.MAX_VALUE;

    public String getOrderBy()
    {
        if (StringUtils.isEmpty(orderByColumn))
        {
            return "";
        }
        return StringUtils.toUnderScoreCase(orderByColumn) + " " + isAsc;
    }

    /**
     * 构建分页对象
     */
    public <T> Page<T> build() {
        Integer pageNum = ObjectUtil.defaultIfNull(getPageNum(), DEFAULT_PAGE_NUM);
        Integer pageSize = ObjectUtil.defaultIfNull(getPageSize(), DEFAULT_PAGE_SIZE);
        if (pageNum <= 0) {
            pageNum = DEFAULT_PAGE_NUM;
        }
        Page<T> page = new Page<>(pageNum, pageSize);
        List<OrderItem> orderItems = buildOrderItem();
        if (CollUtil.isNotEmpty(orderItems)) {
            page.addOrder(orderItems);
        }
        return page;
    }

    /**
     * 构建排序
     *
     * 支持的用法如下:
     * {isAsc:"asc",orderByColumn:"id"} order by id asc
     * {isAsc:"asc",orderByColumn:"id,createTime"} order by id asc,create_time asc
     * {isAsc:"desc",orderByColumn:"id,createTime"} order by id desc,create_time desc
     * {isAsc:"asc,desc",orderByColumn:"id,createTime"} order by id asc,create_time desc
     */
    private List<OrderItem> buildOrderItem() {
        if (StringUtils.isBlank(orderByColumn) || StringUtils.isBlank(isAsc)) {
            return null;
        }
        String orderBy = SqlUtil.escapeOrderBySql(orderByColumn);
        orderBy = StringUtils.toUnderScoreCase(orderBy);

        // 兼容前端排序类型
        isAsc = StringUtils.replaceEach(isAsc, new String[]{"ascending", "descending"}, new String[]{"asc", "desc"});

        String[] orderByArr = orderBy.split(StringUtils.SLASH);
        String[] isAscArr = isAsc.split(StringUtils.SLASH);
        if (isAscArr.length != 1 && isAscArr.length != orderByArr.length) {
            throw new ServiceException("排序参数有误");
        }

        List<OrderItem> list = new ArrayList<>();
        // 每个字段各自排序
        for (int i = 0; i < orderByArr.length; i++) {
            String orderByStr = orderByArr[i];
            String isAscStr = isAscArr.length == 1 ? isAscArr[0] : isAscArr[i];
            if ("asc".equals(isAscStr)) {
                list.add(OrderItem.asc(orderByStr));
            } else if ("desc".equals(isAscStr)) {
                list.add(OrderItem.desc(orderByStr));
            } else {
                throw new ServiceException("排序参数有误");
            }
        }
        return list;
    }

    public Integer getPageNum()
    {
        return pageNum;
    }

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

    public Integer getPageSize()
    {
        return pageSize;
    }

    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;
        }
    }

    public Boolean getReasonable()
    {
        if (StringUtils.isNull(reasonable))
        {
            return Boolean.TRUE;
        }
        return reasonable;
    }

    public void setReasonable(Boolean reasonable)
    {
        this.reasonable = reasonable;
    }
}
