import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class AlertDataSocket {

	static final String CRLF = System.getProperty("line.separator");

	static ServerSocket server;

	static int port = 2016;

	public static void main(String[] args) {
		try {
			if (args.length > 0) {
				String port_V = args[0]; // port
				if (port_V != null && !"".equals(port_V)) {
					port = Integer.parseInt(port_V);
				}
			}
			server = new ServerSocket(port);
		} catch (IOException e) {
			e.printStackTrace();
		}
		String encoding = "UTF-8";
		BufferedReader iReader = null;
		BufferedWriter iWriter = null;
		while (true) {
			Socket client = null;
			try {
				client = server.accept();
				iReader = new BufferedReader(new InputStreamReader(client
						.getInputStream(), encoding));
				iWriter = new BufferedWriter(new OutputStreamWriter(client
						.getOutputStream(), encoding));
				System.out.println("Receive message: " + iReader.readLine());
				sendAck(iWriter);
			} catch (IOException ex) {
				sendNack(iWriter);
				ex.printStackTrace();
			} finally {
				try {
					if (iWriter != null) {
						iWriter.close();
					}
					if (iReader != null) {
						iReader.close();
					}
					if (client != null) {
						client.close();
					}
				} catch (IOException e) {
				}
			}
		}
	}

	public static void sendAck(BufferedWriter iWriter) {
		String statusLine = "HTTP/1.1 200 OK" + CRLF;
		String contentTypeLine = "Content-type: text/html" + CRLF;
		String connectionClose = "Connection: close" + CRLF;
		String content = "<ErrorList><Success>success</Success></ErrorList>";
		String contentLengthLine = "Content-Length: "
				+ (new Integer(content.length())).toString() + CRLF + CRLF;

		try {
			iWriter.write(statusLine);
			iWriter.write(contentTypeLine);
			iWriter.write(connectionClose);
			iWriter.write(contentLengthLine);
			iWriter.write(content);
			iWriter.flush();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

	// Send nack
	public static void sendNack(BufferedWriter iWriter) {
		String statusLine = "HTTP/1.1 400 Bad Request" + CRLF;
		String contentTypeLine = "Content-type: text/html" + CRLF;
		String connectionClose = "Connection: close" + CRLF;
		String content = "<ErrorList><Error>error</Error></ErrorList>";
		String contentLengthLine = "Content-Length: "
				+ (new Integer(content.length())).toString() + CRLF + CRLF;

		try {
			iWriter.write(statusLine);
			iWriter.write(contentTypeLine);
			iWriter.write(connectionClose);
			iWriter.write(contentLengthLine);
			iWriter.write(content);
			iWriter.flush();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

}