package com.ruoyi.system.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.ruoyi.system.domain.Shop;
import com.ruoyi.system.mapper.ShopMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class AppServiceImpl {
    @Autowired
    private ShopMapper shopMapper;
    public List<Shop> getShop(String lng,String lat) {

        Shop shop = new Shop();
        shop.setState("1");
        shop.setIsDefault(0L);
        List<Shop> shops = shopMapper.selectShopList(shop);
        for (Shop shop1 : shops) {
            double v = GetDistance(Double.parseDouble(lng), Double.parseDouble(lat), Double.parseDouble(shop1.getLng()), Double.parseDouble(shop1.getLat()));
            DecimalFormat df = new DecimalFormat("0.00");
            shop1.setDistance(df.format(v));
        }
         return shops.stream().sorted((x, y) -> x.getDistance().compareTo(y.getDistance())).collect(Collectors.toList());

    }

    private static final double EARTH_RADIUS = 6378137;
    /**
     * 根据两点间经纬度坐标（double值），计算两点间距离，单位为米
     * @param lng1
     * @param lat1
     * @param lng2
     * @param lat2
     * @return
     */
    public static double GetDistance(double lng1, double lat1, double lng2, double lat2)
    {
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1 - radLat2;
        double b = rad(lng1) - rad(lng2);
        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2) +
                Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));
        s = s * EARTH_RADIUS;
        s = Math.round(s * 10000) / 10000;
        return s;
    }

    private static double rad(double d)
    {
        return d * Math.PI / 180.0;
    }

}
