package com.webank.bsp_query_agent;

import java.io.*;
import java.net.*;

import org.apache.commons.lang.RandomStringUtils;

import com.alibaba.fastjson.JSONObject;

public class UdpClient {
	private static final int SERVER_PORT = 9301;
	private static final int CLIENT_PORT = 9401;
	private DatagramSocket dataSocket;
	private DatagramPacket sendPack;
	private DatagramPacket recvPack;

	private byte sendByte[];
	private byte recvByte[];
	private String recvStr;

	public UdpClient() {
		init();
	}

	private DatagramPacket getSendPack(String str) {
		try {
			sendByte = str.getBytes();
			return new DatagramPacket(sendByte, sendByte.length,
					InetAddress.getByName("localhost"), SERVER_PORT);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public static String toString(DatagramPacket dp) {
		return new String(dp.getData(), 0, dp.getLength());
	}
	
	private void init() {
		try {
			dataSocket = new DatagramSocket(CLIENT_PORT);
			recvByte = new byte[1024];
			recvPack = new DatagramPacket(recvByte, recvByte.length);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public void send(String msg) {
		try {
			sendPack = getSendPack(msg);
			dataSocket.send(sendPack);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public String recv() {
		try {
			dataSocket.receive(recvPack);
			return toString(recvPack);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
	
	public void runCase(String msg) {
		send(msg);
		System.out.println(String.format("msg is \"%s\".", msg));
		System.out.println(recv());
	}
	
	public static void main(String args[]) {
		UdpClient client = new UdpClient();
		JSONObject json = new JSONObject(true);
		String notExistCard = "0001230000182701";
		String existCard = "0001230000182703";
		
		//client.runCase("{");
		//client.runCase("");
		
		// dcn not found
		//json.put("bizSeqNo", "value");
		//json.put("consumerSeqNo", "value");
		//json.put("cardNo", "value");
		//client.runCase(json.toString());
		
		json.put("bizSeqNo", RandomStringUtils.randomNumeric(32));
		json.put("consumerSeqNo", "20180812001000199999999999999900");
		json.put("cardNo", existCard);
		client.runCase(json.toString());
	}
}