package com.genersoft.iot.vmp.utils;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Base64;

import com.genersoft.iot.vmp.gb28181.bean.BaiduPoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class GpsUtil {

    private static Logger logger = LoggerFactory.getLogger(GpsUtil.class);

    public static BaiduPoint Wgs84ToBd09(String xx, String yy) {


        try {
            Socket s = new Socket("api.map.baidu.com", 80);
            BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream(), "UTF-8"));
            OutputStream out = s.getOutputStream();
            StringBuffer sb = new StringBuffer("GET /ag/coord/convert?from=0&to=4");
            sb.append("&x=" + xx + "&y=" + yy);
            sb.append("&callback=BMap.Convertor.cbk_3976 HTTP/1.1\r\n");
            sb.append("User-Agent: Java/1.6.0_20\r\n");
            sb.append("Host: api.map.baidu.com:80\r\n");
            sb.append("Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2\r\n");
            sb.append("Connection: Close\r\n");
            sb.append("\r\n");
            out.write(sb.toString().getBytes());
            String json = "";
            String tmp = "";
            while ((tmp = br.readLine()) != null) {
                // logger.info(tmp);
                json += tmp;
            }

            s.close();
            int start = json.indexOf("cbk_3976");
            int end = json.lastIndexOf("}");
            if (start != -1 && end != -1 && json.contains("\"x\":\"")) {
                json = json.substring(start, end);
                String[] point = json.split(",");
                String x = point[1].split(":")[1].replace("\"", "");
                String y = point[2].split(":")[1].replace("\"", "");
                BaiduPoint bdPoint= new BaiduPoint();
                bdPoint.setBdLng(new String(decode(x)));
                bdPoint.setBdLat(new String(decode(y)));
                return bdPoint;
                //return (new String(decode(x)) + "," + new String(decode(y)));
            } else {
                logger.info("gps坐标无效！！");
            }
            out.close();
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * BASE64解码
     * @param str
     * @return string
     */
    public static byte[] decode(String str) {
        byte[] bt = null;
        final Base64.Decoder decoder = Base64.getDecoder();
        bt = decoder.decode(str); // .decodeBuffer(str);
        return bt;
    }
}
