package se.nicklasgavelin.sphero.response.regular;

import java.io.UnsupportedEncodingException;
import se.nicklasgavelin.sphero.response.ResponseMessage;

/**
 * A response for the GetBluetoothInfoCommand. Will be created
 * when a response for the command is received.
 * 
 * @author Orbotix
 * @author Nicklas Gavelin, nicklas.gavelin@gmail.com, Luleå University of Technology
 */
public class GetBluetoothInfoResponse extends ResponseMessage
{
	private static final int INFO_DATA_LENGTH = 64, OLD_INFO_DATA_LENGTH = 32,
			INFO_NAME_LENGTH = 48, OLD_INFO_NAME_LENGTH = 16,
			INFO_ADDRESS_LENGTH = 16;

	private String name, address;

	/**
	 * Create the Bluetooth info response from the received data
	 * 
	 * @param rh The response header containing the response data
	 */
	public GetBluetoothInfoResponse( ResponseHeader rh )
	{
		super( rh );

		if( !isCorrupt() )
		{
			byte[] data = this.getPacketPayload();
			if( data == null || ( data.length != INFO_DATA_LENGTH && data.length != OLD_INFO_DATA_LENGTH ) )
			{
				System.err.println( "Data is corrupt" );
				setCorrupt( true );
			}
			else
			{
				// Data is ok, continue reading bluetooth information
				int name_data_length = ( data.length == INFO_DATA_LENGTH ? INFO_NAME_LENGTH : OLD_INFO_NAME_LENGTH );
				int name_length = name_data_length;

				// Check for the end of the name
				for( int i = 0; i < name_data_length; i++ )
				{
					if( data[i] == 0 )
					{
						name_length = i;
						break;
					}
				}

				// Check for the end of the address
				int address_length = INFO_ADDRESS_LENGTH;
				for( int i = 0; i < INFO_ADDRESS_LENGTH; i++ )
				{
					if( data[i + name_data_length] == 0 )
					{
						address_length = i;
						break;
					}
				}

				try
				{
					// Try to set the name and address
					this.name = new String( data, 0, name_length, "UTF-8" );
					this.address = new String( data, name_data_length, address_length, "US-ASCII" );
				}
				catch( UnsupportedEncodingException e )
				{
					System.err.println( "Encoding not supported" );

					// Encoding not supported
					this.name = null;
					this.address = null;
				}
			}
		}
	}

	/**
	 * Returns the name of the device
	 * 
	 * @return the name of the device or null if no name could be fetched
	 */
	public String getName()
	{
		return this.name;
	}

	/**
	 * Returns the Bluetooth address of the device
	 * 
	 * @return The Bluetooth address of the device, or null if no address could
	 *         be fetched
	 */
	public String getAddress()
	{
		return this.address;
	}
}