package com.engine.hostar.util;

import weaver.general.BaseBean;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;

/**
 * @author chenwnj
 * @date 2023/12/14
 * @description
 **/
public class HostarUtil {

    BaseBean bb = new BaseBean();

    // 地球半径，单位：米
    private static final int EARTH_RADIUS = 6371000;

    /**
     * 根据开始日期和结束日期，计算出之间的所有日期
     * @params startDate 指定日期
     * @params endDate 结束日期
     */
    public List<String> getAllDates(String startDate, String endDate) {
        List<String> result = new ArrayList<>();
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");

        LocalDate start = LocalDate.parse(startDate, formatter);
        LocalDate end = LocalDate.parse(endDate, formatter);

        while (!start.isAfter(end)) {
            result.add(start.format(formatter));
            start = start.plusDays(1);
        }

        return result;
    }

    /**经度、纬度
     * 判断两个经纬度坐标之间的距离
     * @params lat1  坐标1的纬度
     * @params lon1  坐标1的经度
     * @params lat2  坐标2的纬度
     * @params lon2  坐标2的经度
     * @return 坐标1、2间距离（米）
     */
    public Double calculateDistance(Double lat1, Double lon1, Double lat2, Double lon2) {
        double dLat = Math.toRadians(lat2 - lat1);
        double dLon = Math.toRadians(lon2 - lon1);

        lat1 = Math.toRadians(lat1);
        lat2 = Math.toRadians(lat2);

        double a = Math.pow(Math.sin(dLat / 2), 2) + Math.pow(Math.sin(dLon / 2), 2) * Math.cos(lat1) * Math.cos(lat2);
        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

        return EARTH_RADIUS * c;
    }


}