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

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

from Screens.MessageBox import MessageBox
from Screens.SubserviceSelection import SubserviceSelection
import NavigationInstance

from Tools.XMLTools import elementsWithTag, mergeText
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 = ev.getEventId()
	return (begin, end, name, description, eit)

# please do not translate log messages
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.start_prepare = 0
		
		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.first_try_prepare = True
		self.timeChanged()
	
	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)
		self.log(0, "Filename calculated as: '%s'" % self.Filename)
		#begin_date + " - " + service_name + description)
	
	def tryPrepare(self):
		self.calculateFilename()
		self.record_service = NavigationInstance.instance.recordService(self.service_ref)
		if self.record_service == None:
			self.log(1, "'record service' failed")
			return False
		else:
			prep_res = self.record_service.prepare(self.Filename + ".ts")
			if prep_res:
				self.log(2, "'prepare' failed: error %d" % prep_res)
				self.record_service = None
				return False

			self.log(3, "prepare ok, writing meta information to %s" % self.Filename)
			try:
				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")
				f.close()
			except:
				self.log(4, "failed to write meta information")
			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 config.recording.asktozap.value == 0:
					self.log(8, "asking user to zap away")
					Notifications.AddNotificationWithCallback(self.failureCB, MessageBox, _("A timer failed to record!\nDisable TV and try again?\n"))
				else: # zap without asking
					self.log(9, "zap without asking")
					self.failureCB(True)

			self.do_backoff()
			# retry
			self.start_prepare = time.time() + self.backoff
			return False
		elif next_state == self.StateRunning:
			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")
			self.record_service.stop()
			self.record_service = None
			return True

	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 old_prepare != 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(str(xml.getAttribute("serviceref")))
	description = xml.getAttribute("description").encode("utf-8")
	repeated = xml.getAttribute("repeated").encode("utf-8")
	try:
		eit = long(xml.getAttribute("eit").encode("utf-8"))
	except:
		eit = None
	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)
	
	for l in elementsWithTag(xml.childNodes, "log"):
		time = int(l.getAttribute("time"))
		code = int(l.getAttribute("code"))
		msg = mergeText(l.childNodes).strip()
		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():
				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:
			list.append('<timer')
			list.append(' begin="' + str(int(timer.begin)) + '"')
			list.append(' end="' + str(int(timer.end)) + '"')
			list.append(' serviceref="' + str(timer.service_ref) + '"')
			list.append(' repeated="' + str(int(timer.repeated)) + '"')
			list.append(' name="' + str(timer.name) + '"')
			list.append(' description="' + str(timer.description) + '"')
			list.append(' eit="' + str(timer.eit) + '"')
			list.append('>\n')
			
			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(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 record(self, entry):
		entry.timeChanged()
		print "[Timer] Record " + str(entry)
		entry.Timer = self
		self.addTimerEntry(entry)

	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()