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package com.github.panxiaole.polestar.common.utils;

import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.URL;
import java.net.UnknownHostException;

/**
 * IP工具
 *
 * @author panxiaole
 * @date 2018-10-23
 */
public class IpUtil {

	private static final String UNKNOWN = "unknown";
	private static final String LOCALHOST_IPV4 = "127.0.0.1";
	private static final String LOCALHOST_IPV6 = "0:0:0:0:0:0:0:1";

	public static String getIpAddress() {
		return getIpAddress(ContextUtil.getRequest());
	}

	/**
	 * 获取请求中的 ip 地址
	 *
	 * @param request request
	 * @return IP
	 */
	public static String getIpAddress(final HttpServletRequest request) {
		String ip = LOCALHOST_IPV4;
		if (request != null) {
			ip = request.getHeader("x-forwarded-for");
			if (StringUtil.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
				ip = request.getHeader("Proxy-Client-IP");
			}
			if (StringUtil.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
				ip = request.getHeader("WL-Proxy-Client-IP");
			}
			if (StringUtil.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_CLIENT_IP");
			}
			if (StringUtil.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_X_FORWARDED_FOR");
			}
			if (StringUtil.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
				ip = request.getRemoteAddr();
				// request.getRemoteAddr() 获取客户端的 IP 地址在大部分情况下都是有效的
				// 但是在通过了 Apache，Squid 等反向代理软件就不能获取到客户端的真实 IP 地址
				// 如果通过了多级反向代理的话 X-Forwarded-For 的值并不止一个
				// 而是一串 IP 值，例如：192.168.1.110,192.168.1.120,192.168.1.130,192.168.1.100
				// 其中第一个 192.168.1.110 才是用户真实的 IP
				if (LOCALHOST_IPV4.equals(ip) || LOCALHOST_IPV6.equals(ip)) {
					// 根据网卡取本机配置的 IP，而不是环回地址
					try {
						ip = InetAddress.getLocalHost().getHostAddress();
					} catch (final UnknownHostException ignored) {
					}
				}
			}
			// 多个 IP 中取第一个
			final String ch = ",";
			if (!StringUtil.isEmpty(ip) && ip.contains(ch)) {
				ip = ip.substring(0, ip.indexOf(ch));
			}
		}
		return ip;
	}

	/**
	 * 通过 IP 获取相关信息(需要联网，调用淘宝的IP库)
	 *
	 * @param ip ip
	 * @return IP相关信息
	 */
	public static String getInfoByIP(final String ip) {
		try {
			final URL url = new URL("http://ip.taobao.com/service/getIpInfo.php?ip=" + ip);
			final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			connection.setRequestMethod("GET");
			connection.setDoOutput(true);
			connection.setDoInput(true);
			connection.setUseCaches(false);

			final InputStream in = connection.getInputStream();
			final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
			final StringBuilder buffer = new StringBuilder();
			String line = bufferedReader.readLine();
			while (line != null) {
				buffer.append(line).append("\r\n");
				line = bufferedReader.readLine();
			}
			bufferedReader.close();
			return buffer.toString();
		} catch (final IOException e) {
			e.printStackTrace();
			return null;
		}
	}
}