import time
import codecs
#from time import datetime
from Tools import Directories, Notifications

from Components.config import config, ConfigYesNo
import timer
import xml.dom.minidom

from enigma import eEPGCache, getBestPlayableServiceReference, \
	eServiceReference, iRecordableService, quitMainloop

from Screens.MessageBox import MessageBox

import NavigationInstance

import Screens.Standby

from time import localtime

from Tools.XMLTools import elementsWithTag, mergeText, stringToXML
from ServiceReference import ServiceReference

# ok, for descriptions etc we have:
# service reference  (to get the service name)
# name               (title)
# description        (description)
# event data         (ONLY for time adjustments etc.)


# parses an event, and gives out a (begin, end, name, duration, eit)-tuple.
# begin and end will be corrected
def parseEvent(ev, description = True):
	if description:
		name = ev.getEventName()
		description = ev.getShortDescription()
	else:
		name = ""
		description = ""
	begin = ev.getBeginTime()
	end = begin + ev.getDuration()
	eit = ev.getEventId()
	begin -= config.recording.margin_before.value * 60
	end += config.recording.margin_after.value * 60
	return (begin, end, name, description, eit)

class AFTEREVENT:
	NONE = 0
	STANDBY = 1
	DEEPSTANDBY = 2

# please do not translate log messages
class RecordTimerEntry(timer.TimerEntry):
######### the following static methods and members are only in use when the box is in (soft) standby
	receiveRecordEvents = False

	@staticmethod
	def shutdown():
		quitMainloop(1)

	@staticmethod
	def gotRecordEvent(recservice, event):
		if event == iRecordableService.evEnd:
			print "RecordTimer.gotRecordEvent(iRecordableService.evEnd)"
			recordings = NavigationInstance.instance.getRecordings()
			if not len(recordings): # no more recordings exist
				rec_time = NavigationInstance.instance.RecordTimer.getNextRecordingTime()
				if rec_time > 0 and (rec_time - time.time()) < 360:
					print "another recording starts in", rec_time - time.time(), "seconds... do not shutdown yet"
				else:
					print "no starting records in the next 360 seconds... immediate shutdown"
					RecordTimerEntry.shutdown() # immediate shutdown
		elif event == iRecordableService.evStart:
			print "RecordTimer.gotRecordEvent(iRecordableService.evStart)"

	@staticmethod
	def stopTryQuitMainloop():
		print "RecordTimer.stopTryQuitMainloop"
		NavigationInstance.instance.record_event.remove(RecordTimerEntry.gotRecordEvent)
		RecordTimerEntry.receiveRecordEvents = False

	@staticmethod
	def TryQuitMainloop():
		if not RecordTimerEntry.receiveRecordEvents:
			print "RecordTimer.TryQuitMainloop"
			NavigationInstance.instance.record_event.append(RecordTimerEntry.gotRecordEvent)
			RecordTimerEntry.receiveRecordEvents = True
			# send fake event.. to check if another recordings are running or
			# other timers start in a few seconds
			RecordTimerEntry.gotRecordEvent(None, iRecordableService.evEnd)
			# send normal notification for the case the user leave the standby now..
			Notifications.AddNotification(Screens.Standby.TryQuitMainloop, 1, onSessionOpenCallback=RecordTimerEntry.stopTryQuitMainloop)
#################################################################

	def __init__(self, serviceref, begin, end, name, description, eit, disabled = False, justplay = False, afterEvent = AFTEREVENT.NONE, checkOldTimers = False):
		timer.TimerEntry.__init__(self, int(begin), int(end))
		
		if checkOldTimers == True:
			if self.begin < time.time() - 1209600:
				self.begin = int(time.time())
		
		if self.end < self.begin:
			self.end = self.begin
		
		assert isinstance(serviceref, ServiceReference)
		
		self.service_ref = serviceref
		self.eit = eit
		self.dontSave = False
		self.name = name
		self.description = description
		self.disabled = disabled
		self.timer = None
		self.record_service = None
		self.start_prepare = 0
		self.justplay = justplay
		self.afterEvent = afterEvent
		
		self.log_entries = []
		self.resetState()
	
	def log(self, code, msg):
		self.log_entries.append((int(time.time()), code, msg))
		print "[TIMER]", msg
	
	def resetState(self):
		self.state = self.StateWaiting
		self.cancelled = False
		self.first_try_prepare = True
		self.timeChanged()
	
	def calculateFilename(self):
		service_name = self.service_ref.getServiceName()
		begin_date = time.strftime("%Y%m%d %H%M", time.localtime(self.begin))
		
		print "begin_date: ", begin_date
		print "service_name: ", service_name
		print "name:", self.name
		print "description: ", self.description
		
		filename = begin_date + " - " + service_name
		if self.name:
			filename += " - " + self.name

		self.Filename = Directories.getRecordingFilename(filename)
		self.log(0, "Filename calculated as: '%s'" % self.Filename)
		#begin_date + " - " + service_name + description)
	
	def tryPrepare(self):
		if self.justplay:
			return True
		else:
			self.calculateFilename()
			rec_ref = self.service_ref and self.service_ref.ref
			if rec_ref and rec_ref.flags & eServiceReference.isGroup:
				rec_ref = getBestPlayableServiceReference(rec_ref, eServiceReference())
				if not rec_ref:
					self.log(1, "'get best playable service for group... record' failed")
					return False
				
			self.record_service = rec_ref and NavigationInstance.instance.recordService(rec_ref)
			if not self.record_service:
				self.log(1, "'record service' failed")
				return False
				
			event_id = self.eit
			if event_id is None:
				event_id = -1
				
			prep_res=self.record_service.prepare(self.Filename + ".ts", self.begin, self.end, event_id)
			if prep_res:
				self.log(2, "'prepare' failed: error %d" % prep_res)
				NavigationInstance.instance.stopRecordService(self.record_service)
				self.record_service = None
				return False
				
			if self.repeated:
				epgcache = eEPGCache.getInstance()
				queryTime=self.begin+(self.end-self.begin)/2
				evt = epgcache.lookupEventTime(rec_ref, queryTime)
				if evt:
					self.description = evt.getShortDescription()
				
			self.log(3, "prepare ok, writing meta information to %s" % self.Filename)
			try:
				f = open(self.Filename + ".ts.meta", "w")
				f.write(rec_ref.toString() + "\n")
				f.write(self.name + "\n")
				f.write(self.description + "\n")
				f.write(str(self.begin) + "\n")
				f.close()
			except IOError:
				self.log(4, "failed to write meta information")
				NavigationInstance.instance.stopRecordService(self.record_service)
				self.record_service = None
				return False
			return True

	def do_backoff(self):
		if self.backoff == 0:
			self.backoff = 5
		else:
			self.backoff *= 2
			if self.backoff > 100:
				self.backoff = 100
		self.log(10, "backoff: retry in %d seconds" % self.backoff)

	def activate(self):
		next_state = self.state + 1
		self.log(5, "activating state %d" % next_state)
		
		if next_state == self.StatePrepared:
			if self.tryPrepare():
				self.log(6, "prepare ok, waiting for begin")
				# fine. it worked, resources are allocated.
				self.next_activation = self.begin
				self.backoff = 0
				return True
			
			self.log(7, "prepare failed")
			if self.first_try_prepare:
				self.first_try_prepare = False
				if not config.recording.asktozap.value:
					self.log(8, "asking user to zap away")
					Notifications.AddNotificationWithCallback(self.failureCB, MessageBox, _("A timer failed to record!\nDisable TV and try again?\n"), timeout=20)
				else: # zap without asking
					self.log(9, "zap without asking")
					Notifications.AddNotification(MessageBox, _("In order to record a timer, the TV was switched to the recording service!\n"), type=MessageBox.TYPE_INFO, timeout=20)
					self.failureCB(True)

			self.do_backoff()
			# retry
			self.start_prepare = time.time() + self.backoff
			return False
		elif next_state == self.StateRunning:
			# if this timer has been cancelled, just go to "end" state.
			if self.cancelled:
				return True

			if self.justplay:
				if Screens.Standby.inStandby:
					self.log(11, "wakeup and zap")
					#set service to zap after standby
					Screens.Standby.inStandby.prev_running_service = self.service_ref.ref
					#wakeup standby
					Screens.Standby.inStandby.Power()
				else:
					self.log(11, "zapping")
					NavigationInstance.instance.playService(self.service_ref.ref)
				return True
			else:
				self.log(11, "start recording")
				record_res = self.record_service.start()
				
				if record_res:
					self.log(13, "start record returned %d" % record_res)
					self.do_backoff()
					# retry
					self.begin = time.time() + self.backoff
					return False
				
				return True
		elif next_state == self.StateEnded:
			self.log(12, "stop recording")
			if not self.justplay:
				NavigationInstance.instance.stopRecordService(self.record_service)
				self.record_service = None
			if self.afterEvent == AFTEREVENT.STANDBY:
				if not Screens.Standby.inStandby: # not already in standby
					Notifications.AddNotificationWithCallback(self.sendStandbyNotification, MessageBox, _("A finished record timer wants to set your\nDreambox to standby. Do that now?"), timeout = 20)
			if self.afterEvent == AFTEREVENT.DEEPSTANDBY:
				if not Screens.Standby.inTryQuitMainloop: # not a shutdown messagebox is open
					if Screens.Standby.inStandby: # not in standby
						RecordTimerEntry.TryQuitMainloop() # start shutdown handling without screen
					else:
						Notifications.AddNotificationWithCallback(self.sendTryQuitMainloopNotification, MessageBox, _("A finished record timer wants to shut down\nyour Dreambox. Shutdown now?"), timeout = 20)
			return True

	def sendStandbyNotification(self, answer):
		if answer:
			Notifications.AddNotification(Screens.Standby.Standby)

	def sendTryQuitMainloopNotification(self, answer):
		if answer:
			Notifications.AddNotification(Screens.Standby.TryQuitMainloop, 1)

	def getNextActivation(self):
		if self.state == self.StateEnded:
			return self.end
		
		next_state = self.state + 1
		
		return {self.StatePrepared: self.start_prepare, 
				self.StateRunning: self.begin, 
				self.StateEnded: self.end }[next_state]

	def failureCB(self, answer):
		if answer == True:
			self.log(13, "ok, zapped away")
			#NavigationInstance.instance.stopUserServices()
			NavigationInstance.instance.playService(self.service_ref.ref)
		else:
			self.log(14, "user didn't want to zap away, record will probably fail")

	def timeChanged(self):
		old_prepare = self.start_prepare
		self.start_prepare = self.begin - self.prepare_time
		self.backoff = 0
		
		if int(old_prepare) != int(self.start_prepare):
			self.log(15, "record time changed, start prepare is now: %s" % time.ctime(self.start_prepare))

def createTimer(xml):
	begin = int(xml.getAttribute("begin"))
	end = int(xml.getAttribute("end"))
	serviceref = ServiceReference(xml.getAttribute("serviceref").encode("utf-8"))
	description = xml.getAttribute("description").encode("utf-8")
	repeated = xml.getAttribute("repeated").encode("utf-8")
	disabled = long(xml.getAttribute("disabled") or "0")
	justplay = long(xml.getAttribute("justplay") or "0")
	afterevent = str(xml.getAttribute("afterevent") or "nothing")
	afterevent = { "nothing": AFTEREVENT.NONE, "standby": AFTEREVENT.STANDBY, "deepstandby": AFTEREVENT.DEEPSTANDBY }[afterevent]
	if xml.hasAttribute("eit") and xml.getAttribute("eit") != "None":
		eit = long(xml.getAttribute("eit"))
	else:
		eit = None
	
	name = xml.getAttribute("name").encode("utf-8")
	#filename = xml.getAttribute("filename").encode("utf-8")
	entry = RecordTimerEntry(serviceref, begin, end, name, description, eit, disabled, justplay, afterevent)
	entry.repeated = int(repeated)
	
	for l in elementsWithTag(xml.childNodes, "log"):
		time = int(l.getAttribute("time"))
		code = int(l.getAttribute("code"))
		msg = mergeText(l.childNodes).strip().encode("utf-8")
		entry.log_entries.append((time, code, msg))
	
	return entry

class RecordTimer(timer.Timer):
	def __init__(self):
		timer.Timer.__init__(self)
		
		self.Filename = Directories.resolveFilename(Directories.SCOPE_CONFIG, "timers.xml")
		
		try:
			self.loadTimer()
		except IOError:
			print "unable to load timers from file!"
			
	def isRecording(self):
		isRunning = False
		for timer in self.timer_list:
			if timer.isRunning() and not timer.justplay:
				isRunning = True
		return isRunning
	
	def loadTimer(self):
		# TODO: PATH!
		doc = xml.dom.minidom.parse(self.Filename)
		
		root = doc.childNodes[0]
		for timer in elementsWithTag(root.childNodes, "timer"):
			self.record(createTimer(timer))

	def saveTimer(self):
		#doc = xml.dom.minidom.Document()
		#root_element = doc.createElement('timers')
		#doc.appendChild(root_element)
		#root_element.appendChild(doc.createTextNode("\n"))
		
		#for timer in self.timer_list + self.processed_timers:
			# some timers (instant records) don't want to be saved.
			# skip them
			#if timer.dontSave:
				#continue
			#t = doc.createTextNode("\t")
			#root_element.appendChild(t)
			#t = doc.createElement('timer')
			#t.setAttribute("begin", str(int(timer.begin)))
			#t.setAttribute("end", str(int(timer.end)))
			#t.setAttribute("serviceref", str(timer.service_ref))
			#t.setAttribute("repeated", str(timer.repeated))			
			#t.setAttribute("name", timer.name)
			#t.setAttribute("description", timer.description)
			#t.setAttribute("eit", str(timer.eit))
			
			#for time, code, msg in timer.log_entries:
				#t.appendChild(doc.createTextNode("\t\t"))
				#l = doc.createElement('log')
				#l.setAttribute("time", str(time))
				#l.setAttribute("code", str(code))
				#l.appendChild(doc.createTextNode(msg))
				#t.appendChild(l)
				#t.appendChild(doc.createTextNode("\n"))

			#root_element.appendChild(t)
			#t = doc.createTextNode("\n")
			#root_element.appendChild(t)


		#file = open(self.Filename, "w")
		#doc.writexml(file)
		#file.write("\n")
		#file.close()

		list = []

		list.append('<?xml version="1.0" ?>\n')
		list.append('<timers>\n')
		
		for timer in self.timer_list + self.processed_timers:
			if timer.dontSave:
				continue

			list.append('<timer')
			list.append(' begin="' + str(int(timer.begin)) + '"')
			list.append(' end="' + str(int(timer.end)) + '"')
			list.append(' serviceref="' + stringToXML(str(timer.service_ref)) + '"')
			list.append(' repeated="' + str(int(timer.repeated)) + '"')
			list.append(' name="' + str(stringToXML(timer.name)) + '"')
			list.append(' description="' + str(stringToXML(timer.description)) + '"')
			list.append(' afterevent="' + str(stringToXML({ AFTEREVENT.NONE: "nothing", AFTEREVENT.STANDBY: "standby", AFTEREVENT.DEEPSTANDBY: "deepstandby" }[timer.afterEvent])) + '"')
			if timer.eit is not None:
				list.append(' eit="' + str(timer.eit) + '"')
			list.append(' disabled="' + str(int(timer.disabled)) + '"')
			list.append(' justplay="' + str(int(timer.justplay)) + '"')
			list.append('>\n')
			
			if config.recording.debug.value:
				for time, code, msg in timer.log_entries:
					list.append('<log')
					list.append(' code="' + str(code) + '"')
					list.append(' time="' + str(time) + '"')
					list.append('>')
					list.append(str(stringToXML(msg)))
					list.append('</log>\n')
			
			list.append('</timer>\n')

		list.append('</timers>\n')

		file = open(self.Filename, "w")
		for x in list:
			file.write(x)
		file.close()

	def getNextZapTime(self):
		llen = len(self.timer_list)
		idx = 0
		now = time.time()
		while idx < llen:
			timer = self.timer_list[idx]
			if not timer.justplay or timer.begin < now:
				idx += 1
			else:
				return timer.begin
		return -1

	def getNextRecordingTime(self):
		llen = len(self.timer_list)
		idx = 0
		now = time.time()
		while idx < llen:
			timer = self.timer_list[idx]
			if timer.justplay or timer.begin < now:
				idx += 1
			else:
				return timer.begin
		return -1

	def record(self, entry):
		entry.timeChanged()
		print "[Timer] Record " + str(entry)
		entry.Timer = self
		self.addTimerEntry(entry)
		
	def isInTimer(self, eventid, begin, duration, service):
		time_match = 0
		chktime = None
		chktimecmp = None
		chktimecmp_end = None
		end = begin + duration
		for x in self.timer_list:
			if str(x.service_ref) == str(service):
				#if x.eit is not None and x.repeated == 0:
				#	if x.eit == eventid:
				#		return duration
				if x.repeated != 0:
					if chktime is None:
						chktime = localtime(begin)
						chktimecmp = chktime.tm_wday * 1440 + chktime.tm_hour * 60 + chktime.tm_min
						chktimecmp_end = chktimecmp + (duration / 60)
					time = localtime(x.begin)
					for y in range(7):
						if x.repeated & (2 ** y):
							timecmp = y * 1440 + time.tm_hour * 60 + time.tm_min
							if timecmp <= chktimecmp < (timecmp + ((x.end - x.begin) / 60)):
								time_match = ((timecmp + ((x.end - x.begin) / 60)) - chktimecmp) * 60
							elif chktimecmp <= timecmp < chktimecmp_end:
								time_match = (chktimecmp_end - timecmp) * 60
				else: #if x.eit is None:
					if begin <= x.begin <= end:
						diff = end - x.begin
						if time_match < diff:
							time_match = diff
					elif x.begin <= begin <= x.end:
						diff = x.end - begin
						if time_match < diff:
							time_match = diff
		return time_match

	def removeEntry(self, entry):
		print "[Timer] Remove " + str(entry)
		
		# avoid re-enqueuing
		entry.repeated = False

		# abort timer.
		# this sets the end time to current time, so timer will be stopped.
		entry.abort()
		
		if entry.state != entry.StateEnded:
			self.timeChanged(entry)
		
		print "state: ", entry.state
		print "in processed: ", entry in self.processed_timers
		print "in running: ", entry in self.timer_list
		# now the timer should be in the processed_timers list. remove it from there.
		self.processed_timers.remove(entry)

	def shutdown(self):
		self.saveTimer()