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

import timer
import xml.dom.minidom

from Screens.MessageBox import MessageBox
import NavigationInstance

from Tools.XMLTools import elementsWithTag
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.
def parseEvent(ev):
	name = ev.getEventName()
	description = ev.getShortDescription()
	begin = ev.getBeginTime()
	end = begin + ev.getDuration()
	eit = None
	return (begin, end, name, description, eit)

class RecordTimerEntry(timer.TimerEntry):
	def __init__(self, serviceref, begin, end, name, description, eit):
		timer.TimerEntry.__init__(self, int(begin), int(end))
		
		assert isinstance(serviceref, ServiceReference)
		
		self.service_ref = serviceref
		
		self.eit = eit
		
		self.dontSave = False
		self.name = name
		self.description = description
		self.timer = None
		self.record_service = None
		self.wantStart = False
		self.prepareOK = False
		
	def calculateFilename(self):
		service_name = self.service_ref.getServiceName()
#		begin_date = datetime.fromtimestamp(begin).strf...
		begin_date = ""
		
		print "begin_date: ", begin_date
		print "service_name: ", service_name
		print "name:", self.name
		print "description: ", self.description

		self.Filename = Directories.getRecordingFilename(service_name)
		#begin_date + " - " + service_name + description)
		
	
	def tryPrepare(self):
		self.calculateFilename()
		self.record_service = NavigationInstance.instance.recordService(self.service_ref)
		if self.record_service == None:
			return False
		else:	
			if self.record_service.prepare(self.Filename + ".ts"):
				self.record_service = None
				return False

			f = open(self.Filename + ".ts.meta", "w")
			f.write(str(self.service_ref) + "\n")
			f.write(self.name + "\n")
			f.write(self.description + "\n")
			f.write(str(self.begin) + "\n")
			del f
			return True

	def activate(self, event):
		if event == self.EventPrepare:
			self.prepareOK = False
			if self.tryPrepare():
				self.prepareOK = True
			else:
				# error.
				Notifications.AddNotificationWithCallback(self.failureCB, MessageBox, _("A timer failed to record!\nDisable TV and try again?\n"))
		elif event == self.EventStart:
			if self.prepareOK:
				self.record_service.start()
				print "timer started!"
			else:
				print "prepare failed, thus start failed, too."
				self.wantStart = True
		elif event == self.EventEnd or event == self.EventAbort:
			self.wantStart = False
			if self.prepareOK:
				self.record_service.stop()
				self.record_service = None
				print "Timer successfully ended"
			else:
				print "prepare failed, thus nothing was recorded."

	def abort():
		# fixme
		pass

	def failureCB(self, answer):
		if answer == True:
			NavigationInstance.instance.stopUserServices()
			self.activate(self.EventPrepare)
			if self.wantStart:
				print "post-activating record"
				self.activate(self.EventStart)
		else:
			print "user killed record"

def createTimer(xml):
	begin = int(xml.getAttribute("begin"))
	end = int(xml.getAttribute("end"))
	serviceref = ServiceReference(str(xml.getAttribute("serviceref")))
	description = xml.getAttribute("description").encode("utf-8")
	repeated = xml.getAttribute("repeated").encode("utf-8")
	eit = xml.getAttribute("eit").encode("utf-8")
	name = xml.getAttribute("name").encode("utf-8")
	#filename = xml.getAttribute("filename").encode("utf-8")
	entry = RecordTimerEntry(serviceref, begin, end, name, description, eit)
	entry.repeated = int(repeated)
	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():
				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(timer.begin))
			t.setAttribute("end", str(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))
			
			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()
	
	def record(self, entry):
		print "[Timer] Record " + str(entry)
		entry.Timer = self
		self.addTimerEntry(entry)

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

		if entry.state == timer.TimerEntry.StateRunning:
			print "remove running timer."
			entry.end = time.time()
			self.timeChanged(entry)
		elif entry.state != timer.TimerEntry.StateEnded:
			entry.activate(timer.TimerEntry.EventAbort)
			self.timer_list.remove(entry)

			self.calcNextActivation()
			print "timer did not yet start - removing"

			# the timer was aborted, and removed.
			return
		else:
			print "timer did already end - doing nothing."
		
		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()