import time
import threading
import Queue as queue
from phoneinterface import PhoneInterface, PhoneEvent
from tuitest import FeApPinConfiguration, FeApUserInterface

class IllegalEventError(Exception):
	pass


"""
An abstract state, needed to define all possible events.

"""
class AbstractState(object):
	def on_registration_in_progress(self):
		raise IllegalEventError()

	def on_registration_successful(self):
		raise IllegalEventError()

	def on_gabelschalter_up(self):
		raise IllegalEventError()

	def on_gabelschalter_down(self):
		raise IllegalEventError()
	
	def on_incoming_call(self):
		raise IllegalEventError()
	
	def on_call_ended(self):
		raise IllegalEventError()
	
	def on_call_accepted(self):
		raise IllegalEventError()
	
	def on_call_ringing(self):
		raise IllegalEventError()

	def on_invalid_number(self):
		raise IllegalEventError()
	
	def on_nummernschalter_active(self):
		raise IllegalEventError()

	def on_nummernschalter_input(self, num):
		raise IllegalEventError()
	
	def on_timeout(self):
		raise IllegalEventError()


"""
The basic state that every other state inherits from. It defines default
behaviour for some events (overriden if necessary).

"""
class BaseState(AbstractState):
	def __init__(self, controller):
		self._controller = controller

	def on_gabelschalter_up(self):
		return None

	def on_gabelschalter_down(self):
		return None

	def on_incoming_call(self):
		self._controller.get_phone().decline_call()

	def on_call_ended(self):
		# When an incoming call is declined, a call_ended event occurs, which
		# needs to be ignored, here.
		return None

	def on_nummernschalter_active(self):
		return None

	def on_nummernschalter_input(self, num):
		return None


class InitState(BaseState):
	def __init__(self, controller):
		super(InitState, self).__init__(controller)
		self._controller.get_feap().set_schauzeichen(True)

	def on_registration_in_progress(self):
		print('registration in progress')
		return RegisteringState

class RegisteringState(BaseState):
	def __init__(self, controller):
		super(RegisteringState, self).__init__(controller)

	def on_registration_successful(self):
		print('registration successful')
		self._controller.get_feap().set_schauzeichen(False)
		return IdleState

class IdleState(BaseState):
	def on_incoming_call(self):
		print('incomfing call')
		return SchelltState
	
	def on_gabelschalter_up(self):
		print('gabel up')
		return DialingState
	
class SchelltState(BaseState):
	def __init__(self, controller):
		super(SchelltState, self).__init__(controller)
		self._controller.get_feap().set_wecker(True)

	def __on_leave(self):
		self._controller.get_feap().set_wecker(False)

	def on_gabelschalter_up(self):
		self.__on_leave()
		return AcceptingState
	
	def on_call_ended(self):
		self.__on_leave()
		return IdleState

class AcceptingState(BaseState):
	def __init__(self, controller):
		super(AcceptingState, self).__init__(controller)
		self._controller.get_phone().accept_call()

	def on_call_accepted(self):
		return CallRunningState

class CallTerminatingState(BaseState):
	def __init__(self, controller):
		super(CallTerminatingState, self).__init__(controller)
		self._controller.get_phone().end_call()

	def on_call_ended(self):
		return IdleState
	
	def on_call_accepted(self):
		return None

class ForgottenState(BaseState):
	def on_gabelschalter_down(self):
		return IdleState

class BusyBeepingState(BaseState):
	def __init__(self, controller):
		super(BusyBeepingState, self).__init__(controller)
		self._controller.get_phone().play_busy_tone()

	def __on_leave(self):
		self._controller.get_phone().stop_playing()

	def on_timeout(self):
		return ForgottenState
	
	def on_gabelschalter_down(self):
		self.__on_leave()
		return IdleState

class CallRunningState(BaseState):
	def on_gabelschalter_down(self):
		return CallTerminatingState
	
	def on_call_ended(self):
		return BusyBeepingState

class WecktState(BaseState):
	def on_gabelschalter_down(self):
		return CallTerminatingState
	
	def on_call_ended(self):
		return BusyBeepingState
	
	def on_call_accepted(self):
		return CallRunningState

class ConnectingState(BaseState):
	def on_gabelschalter_down(self):
		return CallTerminatingState
	
	def on_call_ringing(self):
		return WecktState

	def on_call_accepted(self):
		return CallRunningState

	def on_invalid_number(self):
		# TODO: play sound
		return BusyBeepingState

	def on_call_ended(self):
		return BusyBeepingState

class DialingState(BaseState):
	def __init__(self, controller):
		super(DialingState, self).__init__(controller)
		self._controller.get_phone().play_dial_tone()
		self.__dial_tone = True
		self.__number = ''

	def __on_leave(self):
		if self.__dial_tone:
			self._controller.get_phone().stop_playing()
		self._controller.abort_timeout()

	def on_gabelschalter_down(self):
		self.__on_leave()
		return IdleState

	def on_nummernschalter_active(self):
		self._controller.abort_timeout()
		if self.__dial_tone:
			self._controller.get_phone().stop_playing()

	def on_nummernschalter_input(self, num):
		print('nummernschalter: %d' % (num))
		if self.__dial_tone:
			self._controller.get_phone().stop_playing()
		self.__number += str(num)
		self._controller.abort_timeout()
		self._controller.set_timeout(5000)
	
	def on_timeout(self):
		self.__on_leave()
		print 'Dialing number:', self.__number
		self._controller.get_phone().call(self.__number)
		return ConnectingState


class StateMachineController(object):
	def __init__(self, phone, feap):
		self.__state = InitState(self)
		self.__phone = phone
		self.__feap = feap

		self.__timeout = None

		self.__running = True
		self.__evqueue = queue.Queue()
		self.__evthread = threading.Thread(target=self.__event_dispatcher)
		self.__evthread.start()
	
	def __event_dispatcher(self):
		while self.__running:
			(evname, evargs, evkwargs) = self.__evqueue.get()
			if not evname:
				return

			print('!!! event: %s' % (evname))
			handler = getattr(self.__state, 'on_%s' % (evname))
			try:
				newstate = handler(*evargs, **evkwargs)
			except IllegalEventError:
				print('illegal event occured!!!!!!!!!!!!!!!!!!!!', self.__state.__class__.__name__)
			if not newstate:
				continue

			oldstate = self.__state.__class__
			print('%s -> %s' % (oldstate.__name__, newstate.__name__))
			self.__state = newstate(self)

	def queue_event(self, evname, *evargs, **evkwargs):
		if not hasattr(AbstractState, 'on_%s' % (evname)):
			raise ValueError('Illegal event name: %s' % (evname))
		self.__evqueue.put((evname, evargs, evkwargs))

	def set_timeout(self, timeout):
		self.__timeout = threading.Timer(timeout/1000, self.queue_event, args=['timeout'])
		self.__timeout.start()

	def abort_timeout(self):
		if self.__timeout:
			self.__timeout.cancel()
		self.__timeout = None

	def get_phone(self):
		return phone

	def get_feap(self):
		return feap

	def stop(self, hard=False):
		if hard:
			self.__running = False
		self.__evqueue.put((None, None, None))

c = None
def gabelschalter_cb(state):
	global c
	if state == 1:
		c.queue_event('gabelschalter_up')
	else:
		c.queue_event('gabelschalter_down')

def nummernschalter_active_cb():
	global c
	c.queue_event('nummernschalter_active')

def nummernschalter_done_cb(digit):
	global c
	c.queue_event('nummernschalter_input', digit)

def phone_cb(event):
	if event == PhoneEvent.RegInProgress:
		c.queue_event('registration_in_progress')
	elif event == PhoneEvent.RegSuccessfull:
		c.queue_event('registration_successful')
	elif event == PhoneEvent.CallIncoming:
		c.queue_event('incoming_call')
	elif event == PhoneEvent.CallAccepted:
		c.queue_event('call_accepted')
	elif event == PhoneEvent.CallEnded:
		c.queue_event('call_ended')
	elif event == PhoneEvent.CallRinging:
		c.queue_event('call_ringing')
	elif event == PhoneEvent.CallBusy:
		c.queue_event('call_ended')
	elif event == PhoneEvent.CallInvalidNumber:
		c.queue_event('invalid_number')

if __name__ == '__main__':
	phone = PhoneInterface(None, '.linphonerc')
	pinconf = FeApPinConfiguration()
	feap = FeApUserInterface(pinconf)
	c = StateMachineController(phone, feap)

	feap.add_gabelschalter_callback(gabelschalter_cb)
	feap.add_nummernschalter_active_callback(nummernschalter_active_cb)
	feap.add_nummernschalter_done_callback(nummernschalter_done_cb)
	phone.add_event_cb(phone_cb)

	phone.start()
	
	try:
		while True:
			time.sleep(1)

		'''
		c.queue_event('gabelschalter_up')
		c.queue_event('nummernschalter_input', 4)
		c.queue_event('nummernschalter_input', 2)
		#c.queue_event('gabelschalter_down')
		#c.queue_event('call_accepted')
		c.queue_event('timeout')
		c.queue_event('call_ringing')
		#c.queue_event('gabelschalter_down')
		c.queue_event('call_accepted')
		c.queue_event('call_ended')
		c.queue_event('timeout')
		c.queue_event('gabelschalter_down')
		'''

	except KeyboardInterrupt:
		phone.stop()
		feap.set_wecker(False)
		c.stop()