#!/usr/bin/python3
#  $HeadURL$ $LastChangedRevision$

def check_media(media_id):
    print("check_media: media_id=%s" % (media_id))
    return True

def check_media_and_set(media_id, set_id):
    print("check_media_and_set: media_id=%s, set_id=%s" % (media_id, set_id))
    return False

#  Use of lambda delays evaluation.
steps = {
    'START':               lambda : 'xxx',
    'xxx':                 lambda : 'check_media',
    'check_media':         lambda : 'check_media_and_set' if check_media(media_id) else 'check_media_and_set_failed', 
    'check_media_and_set': lambda : 'OK'                  if check_media_and_set(media_id, set_id) else 'FAIL',
}


state = 'START'
media_id = 'vtape003.04'
set_id = 'weekly'
while state != 'FAIL' and state != 'OK':
    print("looking up action for state '%s' ..." % (state))
    state = steps[state]()
print(state)