import java.io.*;
import java.util.*;
import javax.comm.*;

class WTCommunication implements SerialPortEventListener
{	
	//##### DECLARATIONS #####
	
	//variables
	private byte[] readBuffer = new byte[3]; //in our application we needed 3 bytes per send/receive
	private WTConnection conn;
	
	//constructor
	WTCommunication(WTConnection conn) 
	{
		this.conn = conn;
		
		//enable listening on port so we get noticed when there's data coming in
		try { 
			conn.serialPort.addEventListener(this);
		} catch (TooManyListenersException e) {}
		
		conn.serialPort.notifyOnDataAvailable(true);
	}
	
	//##### METHOD SEND: sends a packet to the port #####
	public void Send(byte[] pkg)
	{
		try {
			conn.outputStream.write(pkg);
		}
		catch (IOException e) {
			System.err.println(e);
		}
	}
		
	public void Send(int pkg)
	{
		System.out.println((byte) pkg + " sent to port");
		try {
			conn.outputStream.write((byte) (pkg));
			conn.outputStream.write((byte)  (pkg));
			conn.outputStream.write((byte)  (pkg ));
			conn.outputStream.write((byte)  (pkg));
			conn.outputStream.write((byte)  (pkg));
		}
		catch (IOException e) {
			System.err.println(e);
		}
	}
		
	//##### METHOD RECEIVE: receives a packet from the serial port #####
	public byte[] Receive(byte[] pkg)
	{	
		Send(pkg); 	//send an empty packet first to trigger a response, this is application specific.

	  	try { //wait a while to allow a response - application specific
		   	Thread.sleep(100);
		}
		catch(InterruptedException e) {
		     System.err.println(e);
		}
		
		return readBuffer;
	}
	
	//##### METHOD SERIALEVENT: this is an inherited method that is called automatically when there is data coming in #####	
	public void serialEvent(SerialPortEvent event) 
	{
		switch(event.getEventType()) {
	    	case SerialPortEvent.DATA_AVAILABLE:	    		    			    			    		
		 	try {
				while (conn.inputStream.available() > 0) 
				{					
					int numBytes = conn.inputStream.read(readBuffer);
				}				 			 
			} catch (IOException e) {
				System.err.println(e);
			}	    	
	    }		
	}
}