package com.chinacreator.videoalliance.net.util;

import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.URLEncoder;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.math.NumberUtils;
import org.apache.log4j.Logger;

public class RequestUtil {

	
	private static final String ANDROID = ".*(?i)Android.*";
	
	private static final String IPHONE = ".*(?i)iPhone.*";
	
	private static final String PORT = ":port=";
	
	public static String getQueryString(HttpServletRequest request) {
		if("GET".equalsIgnoreCase(request.getMethod())) {
			return request.getQueryString();
		} else {
			Enumeration<String> enumeration = request.getParameterNames();
			StringBuffer buffer = new StringBuffer();
			while(enumeration.hasMoreElements()) {
				String key = enumeration.nextElement();
				String value = request.getParameter(key);
				if("userid".equals(key)) {
					try {
						value = URLEncoder.encode(value, "UTF-8");
					} catch (UnsupportedEncodingException e) {
						e.printStackTrace();
					}
				}
				buffer.append(key).append("=").append(value);
				if(enumeration.hasMoreElements()) {
					buffer.append("&");
				}
			}
			return buffer.toString();
		}
	}
	
	public static String getIpAddr(HttpServletRequest request) {
		String ip = request.getHeader("X-Real-IP");
		if (inValidateIpAddr(ip)) {
			ip = request.getHeader("X-Forwarded-For");
		}
		if (inValidateIpAddr(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (inValidateIpAddr(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (inValidateIpAddr(ip)) {
			ip = request.getHeader("clientip");
		}
		if (inValidateIpAddr(ip)) {
			ip = request.getRemoteAddr();
		}
		int index = ip.indexOf(",");
		if (index != -1) {
			ip = ip.substring(0, index);
		}
		return ip;
	}
	
	private static boolean inValidateIpAddr(String ip) {
		return ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip) || ip.startsWith("10.") || ip.startsWith("172.") || ip.startsWith("192.") || ip.startsWith("111.206.133.34");
	}
	
	public static String getHostIp() {
		try {
			Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
			while (en.hasMoreElements()) {
				NetworkInterface intf = (NetworkInterface) en.nextElement();
				Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses();
				while (enumIpAddr.hasMoreElements()) {
					InetAddress inetAddress = (InetAddress) enumIpAddr.nextElement();
					if (!inetAddress.isLoopbackAddress() && !inetAddress.isLinkLocalAddress() && inetAddress.isSiteLocalAddress()) {
						return inetAddress.getHostAddress().toString();
					}
				}
			}
		} catch (SocketException e) {
			e.printStackTrace();
		}
		return null;
	}
	
	public static String getUserAgent(HttpServletRequest request) {
		return request.getHeader("user-agent");
	}
	
	public static String getAppType(HttpServletRequest request) {
		String userAgent = getUserAgent(request);
		String appType = null;
		if(userAgent.matches(ANDROID)) {
			appType = "Android";
		} else if(userAgent.matches(IPHONE)) {
			appType = "iPhone";
		}
		return appType;
	}
	
	public static String getBasePath(HttpServletRequest request) {
		String path = request.getContextPath();
		return getDomain(request) + path;
	}
	
	public static String getDomain(HttpServletRequest request) {
		String useragent = request.getHeader("user-agent");
		int port = -1;
		if(useragent != null) {
			int index = useragent.indexOf(PORT);
			if(index != -1) {
				port = NumberUtils.toInt(useragent.substring(index + PORT.length()), -1);
			}
		}
		
		if (port == -1) {
			port = request.getServerPort();
		}
		if(port == 80) {
			return request.getScheme() + "://" + request.getServerName();
		}
		return request.getScheme() + "://" + request.getServerName() + ":" + port;
	}
	

	
}