package com.panzhihua.service_community.util;

import lombok.extern.slf4j.Slf4j;

import java.util.HashMap;
import java.util.Map;

/**
 * @ClassName: MapDistance
 * @Author: yh
 * @Date: 2022/11/11 15:21
 * @Description: 经纬度处理
 */
@Slf4j
public class MapDistance {
    private static double EARTH_RADIUS = 6378.137;


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

    private static final double EARTH_RADIUS1 = 6370996.81;

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

    public static Double distanceOfTwoPoints(String lat1Str, String lng1Str, String lat2Str, String lng2Str) {
        Double lat1 = Double.parseDouble(lat1Str);
        Double lng1 = Double.parseDouble(lng1Str);
        Double lat2 = Double.parseDouble(lat2Str);
        Double lng2 = Double.parseDouble(lng2Str);

        double radLat1 = radian(lat1);
        double radLat2 = radian(lat2);
        double a = radLat1 - radLat2;
        double b = radian(lng1) - radian(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_RADIUS1;
        s = Math.round(s * 10000) / 10000;
        return s;
    }


    /**
     * 根据两个位置的经纬度，来计算两地的距离（单位为KM）
     * 参数为String类型
     * @return
     */
    public static String getDistance(String lat1Str, String lng1Str, String lat2Str, String lng2Str) {
        Double lat1 = Double.parseDouble(lat1Str);
        Double lng1 = Double.parseDouble(lng1Str);
        Double lat2 = Double.parseDouble(lat2Str);
        Double lng2 = Double.parseDouble(lng2Str);
        double patm = 2;
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double difference = radLat1 - radLat2;
        double mdifference = rad(lng1) - rad(lng2);
        double distance = patm * Math.asin(Math.sqrt(Math.pow(Math.sin(difference / patm), patm)
                + Math.cos(radLat1) * Math.cos(radLat2)
                * Math.pow(Math.sin(mdifference / patm), patm)));
        distance = distance * EARTH_RADIUS;
        String distanceStr = String.valueOf(distance);
        return distanceStr;
    }

    /**
     * 获取当前用户一定距离以内的经纬度值
     * 单位米 return minLat
     * 最小经度 minLng
     * 最小纬度 maxLat
     * 最大经度 maxLng
     * 最大纬度 minLat
     */
    public static Map<Object,Object> getAround(String latStr, String lngStr, double raidusMile) {
        log.info("latStr："+latStr+"，lngStr："+lngStr+"，raidusMile:"+raidusMile);
        Map<Object,Object> map = new HashMap<Object,Object>();

        Double latitude = Double.parseDouble(latStr);// 传值给经度
        Double longitude = Double.parseDouble(lngStr);// 传值给纬度

        Double degree = (24901 * 1609) / 360.0; // 获取每度
//        double raidusMile = Double.parseDouble(raidus);

        Double mpdLng = Double.parseDouble((degree * Math.cos(latitude * (Math.PI / 180))+"").replace("-", ""));
        Double dpmLng = 1 / mpdLng;
        Double radiusLng = dpmLng * raidusMile;
        //获取最小经度
        Double minLat = longitude - radiusLng;
        // 获取最大经度
        Double maxLat = longitude + radiusLng;

        Double dpmLat = 1 / degree;
        Double radiusLat = dpmLat * raidusMile;
        // 获取最小纬度
        Double minLng = latitude - radiusLat;
        // 获取最大纬度
        Double maxLng = latitude + radiusLat;

        map.put("minLat", minLat+"");
        map.put("maxLat", maxLat+"");
        map.put("minLng", minLng+"");
        map.put("maxLng", maxLng+"");

        return map;
    }

    public static void main(String[] args) {
        //济南国际会展中心经纬度：117.11811  36.68484
        //趵突泉：117.00999000000002  36.66123
        //103.962128,30.57568
        //103.957232,30.636726
//        System.out.println(getDistance("30.57568","103.962128","30.636726","103.957232"));

        //103.842654,30.560987
        System.out.println(getAround("104.082679", "30.592872", 900000d));
        //117.01028712333508(Double), 117.22593287666493(Double),
        //36.44829619896034(Double), 36.92138380103966(Double)
        //104.03035080138962(String), 104.12020319861038(String), 30.271352899925574(String), 30.64081710007443(String)
//        distanceOfTwoPoints("30.57568","103.962128","30.636726","103.957232");
    }

}