package org.rpi.plugin.custombutton;
   
   import net.xeoh.plugins.base.annotations.PluginImplementation;
   
   import org.apache.log4j.Logger;
   
   import com.pi4j.io.gpio.GpioController;
   import com.pi4j.io.gpio.GpioFactory;
   import com.pi4j.io.gpio.GpioPinDigitalInput;
  import com.pi4j.io.gpio.PinPullResistance;
  import com.pi4j.io.gpio.RaspiPin;
  import com.pi4j.io.gpio.event.GpioPinDigitalStateChangeEvent;
  import com.pi4j.io.gpio.event.GpioPinListenerDigital;
  
  @PluginImplementation
  public class CustomButtonImpl implements CustomButtonInterface {
  	
  	private static Logger log = Logger.getLogger(CustomButtonImpl.class);
  	
  	private GpioController gpio = null;
  
  	// provision gpio pin #02 as an input pin with its internal pull down resistor enabled
  	private GpioPinDigitalInput myButton = null;
  	
  	public CustomButtonImpl()
  	{
  		log.info("CustomButtonImpl initialization");
  		initPi4J();
  	}
  	
  	private void initPi4J() {
  		try {
  			
  			gpio = GpioFactory.getInstance();
  			myButton = gpio.provisionDigitalInputPin(RaspiPin.GPIO_02, PinPullResistance.PULL_DOWN);
  			addButtons();
  		} catch (Exception e) {
  			log.error("Error Initializing Pi4J" + e.getMessage());
  		}
  
  	}
  
  	public void addButtons() {
  		try {
  			// create and register gpio pin listener
  			myButton.addListener(new GpioPinListenerDigital() {
  				@Override
  				public void handleGpioPinDigitalStateChangeEvent(GpioPinDigitalStateChangeEvent event) {
  					// display pin state on console
  					log.info(" --> GPIO PIN STATE CHANGE: " + event.getPin() + " = " + event.getState());
  				}
  			});
  		} catch (Exception e) {
  
  		}
  	}
  
  }