package com.fdkankan.ucenter.geo;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;

public class IPUtils {
    private static IPLocationService locationService;

    static {
        try {
            locationService = new IPLocationService("geo/GeoLite2-City.mmdb");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getCountry(String ip) {
        if (locationService != null) {
            return locationService.getCountryByIP(ip);
        }
        return "Unknown";
    }

    public static Map<String, String> getLocationInfo(String ip) {
        Map<String, String> info = new HashMap<>();
        if (locationService != null) {
            IPLocation location = locationService.getLocationByIP(ip);
            if (location != null) {
                info.put("country", location.getCountry());
                info.put("city", location.getCity());
                info.put("latitude", String.valueOf(location.getLatitude()));
                info.put("longitude", String.valueOf(location.getLongitude()));
            }
        }
        return info;
    }

    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        ipAddress = request.getHeader("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
        }

// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
            // = 15
            if (ipAddress.indexOf(",") > 0) {
                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
        }
        // 或者这样也行,对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
//return ipAddress!=null&&!"".equals(ipAddress)?ipAddress.split(",")[0]:null;
        return ipAddress;
    }

}