import jmri.jmrit.jython.Jynstrument as Jynstrument
import java.awt.CardLayout as CardLayout
import jmri.util.ResizableImagePanel as ResizableImagePanel
import java.awt.event.MouseListener as MouseListener
import java.beans.PropertyChangeListener as PropertyChangeListener
import jmri.jmrit.throttle.AddressListener as AddressListener

class Light(Jynstrument, PropertyChangeListener, AddressListener, MouseListener):
# Jynstrument mandatory part
# Here this JYnstrument like to be in a ThrottleFrame and no anywhere else
    def getExpectedContextClassName(self):
        return "jmri.jmrit.throttle.ThrottleFrame"

    def init(self):
        self.setLayout( CardLayout() )
        self.labelOff = ResizableImagePanel(self.getFolder() + "/LightOff.png",100,100 ) 
        self.labelOn = ResizableImagePanel(self.getFolder() + "/LightOn.png",100,100 )
        self.add(self.labelOff, "off")
        self.add(self.labelOn, "on")
        self.addComponentListener(self.labelOff)
        self.addComponentListener(self.labelOn)
        self.addMouseListener(self)
        self.getContext().getAddressPanel().addAddressListener(self)
        self.throttle = self.getContext().getAddressPanel().getThrottle()
        self.updateThrottle()
        self.setIcon()

    def quit(self):   # very important to clean up everything to make sure GC will collect us
        self.cleanThrottle()
        self.getContext().getAddressPanel().removeAddressListener(self)

# this is a good way to make sure that we're are actaully GCed 
# using memory watcher in development menu, we can force a GC from there
    def __del__(self):  
        print "in destructor"

#Inner workings:
    def updateThrottle(self):    # update throttle informations when a new one is detected
        if self.throttle != None :
            self.throttle.addPropertyChangeListener(self)
        
    def cleanThrottle(self):     # clean up throttle information when it is deconnected
        if self.throttle != None :
            self.throttle.removePropertyChangeListener(self)
        self.throttle = None

    def switch(self):      # actually do function value change
        if self.throttle != None :
            self.throttle.setF0( not self.throttle.getF0() )   # HERE!
        self.setIcon()

    def setIcon(self):     # update appearance
        cl = self.getLayout()
        if self.throttle == None :
            cl.show(self, "off")
        elif self.throttle.getF0() :
            cl.show(self, "on")
        else :
            cl.show(self, "off")

#PropertyChangeListener part: to listen for Function 0 changes
    def propertyChange(self, event):
        if event.getPropertyName() == "F0" :
            self.setIcon()

#AddressListener part: to listen for address changes in address panel (release, acquired)
    def notifyAddressChosen(self, address, isLong):
        pass

    def notifyAddressThrottleFound(self, throttle):
        self.throttle = throttle
        self.updateThrottle()
        self.setIcon()
    
    def notifyAddressReleased(self, address, isLong):
        self.cleanThrottle()
        self.setIcon()

#MouseListener part: to listen for mouse events
    def mouseReleased(self, event):
        self.switch()

    def mousePressed(self, event):
        pass
    def mouseClicked(self, event):
        pass
    def mouseExited(self, event):
        pass
    def mouseEntered(self, event):
        pass