from webob import Request, Response
import RPi.GPIO as GPIO  # Import library for GPIO (pin) access
GPIO.setmode(GPIO.BOARD) # Specify that we use the BOARD numbers (pin numbers 1-26 on the connector)
GPIO.setwarnings(False)  # Disable the warning "This channel is already in use"

GPIO.setup(22, GPIO.OUT)  # Configure pin 22 as an output
GPIO.output(22, 0)      # Turn off the LED when the program starts

class WebApp(object):
    def __call__(self, environ, start_response):
        # capture the request coming from the browser
        req = Request(environ)
        print("**** Serving request ****")
        # Look for on_off_variable in the request:
        x = req.params.get('on_off_variable')   # save content of on_off_variable in x
        print(x)

        if x == "on":           # if button ON pressed...
            GPIO.output(22, 1)  # turn on LED

        elif x == "off":          # if button OFF pressed...
            GPIO.output(22, 0)  # turn off LED

        html = """
Turn on or off the led:
<form method="get">
<button type="submit" name="on_off_variable" value="on">ON</button>
<button type="submit" name="on_off_variable" value="off">OFF</button>
</form>
"""
            
        # create and return the response to the browser
        resp = Response(html)
        return resp(environ, start_response)

application = WebApp()

# main program - the web server
if __name__ == '__main__':
    from wsgiref.simple_server import make_server
    port = 8080
    httpd = make_server('', port, application)
    print('Serving HTTP on port %s...'%port)
    httpd.serve_forever()