package com.lf.server.service.all;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.lf.server.helper.AesHelper;
import com.lf.server.helper.ClassHelper;
import com.lf.server.helper.StringHelper;
import com.lf.server.mapper.all.GeomBaseMapper;
import org.springframework.stereotype.Service;

/**
 * 父查询服务类
 * @author WWW
 */
@Service
public class BaseQueryService {
    /**
     * 获取父Mapper
     *
     * @param name Mapper名
     * @return BaseMapper
     */
    public BaseMapper getBaseMapper(String name) {
        if (StringHelper.isEmpty(name)) {
            return null;
        }

        Object obj = ClassHelper.getBean(name.trim() + "Mapper");
        if (!(obj instanceof BaseMapper)) {
            return null;
        }

        return (BaseMapper) obj;
    }

    /**
     * 获取空间父Mapper
     *
     * @param name Mapper名
     * @return GeomBaseMapper
     */
    public GeomBaseMapper getGeoBaseMapper(String name) {
        if (StringHelper.isEmpty(name)) {
            return null;
        }

        Object obj = ClassHelper.getBean(name.trim() + "Mapper");
        if (!(obj instanceof GeomBaseMapper)) {
            return null;
        }

        return (GeomBaseMapper) obj;
    }

    /**
     * @param wrapper
     * @param filter
     */
    public <T> void addFilterWrapper(QueryWrapper<T> wrapper, String filter) {
        if (StringHelper.isEmpty(filter)) {
            return;
        }

        String[] strs = filter.trim().split(" (?i)and ");
        for (String str : strs) {
            int start = str.indexOf(" ");
            if (start == -1) {
                continue;
            }
            int end = str.indexOf(" ", start + 1);
            if (end == -1) {
                continue;
            }

            String field = str.substring(0, start).trim();
            String express = str.substring(start + 1, end).trim().toLowerCase();
            String value = str.substring(end + 1).trim();
            addWrapper(wrapper, field, express, value);
        }
    }

    private <T> void addWrapper(QueryWrapper<T> wrapper, String field, String express, String value) {
        switch (express) {
            case "like":
                wrapper.like(field, value);
                break;
            case ">":
                wrapper.gt(field, value);
                break;
            case ">=":
                wrapper.ge(field, value);
                break;
            case "<>":
                wrapper.ne(field, value);
                break;
            case "=":
                wrapper.eq(field, value);
                break;
            case "<":
                wrapper.lt(field, value);
                break;
            case "<=":
                wrapper.le(field, value);
                break;
            default:
                break;
        }
    }

    /**
     * 添加空间查询条件
     *
     * @param baseMapper 父Mapper
     * @param wrapper    QueryWrapper
     * @param wkt        WKT（著名文本）
     * @param srid       空间引用标识符
     * @throws Exception 异常
     */
    public void addGeomWrapper(BaseMapper baseMapper, QueryWrapper<Object> wrapper, String wkt, Integer srid) throws Exception {
        if (baseMapper instanceof GeomBaseMapper && !StringHelper.isEmpty(wkt) && srid != null) {
            wkt = AesHelper.decrypt(wkt);
            wrapper.apply(String.format("ST_Intersects(geom, ST_PolygonFromText('%s', %d))", wkt, srid));
        }
    }
}