def lambda_handler(event, context):
	#Checks to make sure application id is same as alexa skill (links)
	if (event['session']['application']['applicationId'] !=
		#Change to application id listed under your alexa skill in the developer portal
		"amzn1.ask.skill.XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"):
		raise ValueError("Invalid Application ID")

	if event["session"]["new"]:
		on_session_started({"requestId": event["request"]["requestId"]}, event["session"])
		#check event types and call appropriate response
		if event["request"]["type"] == "LaunchRequest":
			return on_launch(event["request"], event["session"])
		elif event["request"]["type"] == "IntentRequest":
			return on_intent(event["request"], event["session"])
		elif event["request"]["type"] == "SessionEndedRequest":
			return on_session_ended(event["request"], event["session"])
####################################################################
def on_session_started(session_started_request, session):
	print "Starting new."
####################################################################
def on_launch(launch_request, session):
	return get_welcome_response()
####################################################################
def on_intent(intent_request, session):
	intent = intent_request["intent"]
	intent_name = intent_request["intent"]["name"]

	if intent_name == "Hello":
		return say_hello()
	elif intent_name == "AMAZON.HelpIntent":
		return get_welcome_response()
	elif intent_name == "AMAZON.CancelIntent" or intent_name == "AMAZON.StopIntent":
		return handle_session_end_request()
	else:
		raise ValueError("Invalid intent")
####################################################################
def on_session_ended(session_ended_request, session):
	print "Ending session."
####################################################################
def say_hello():
	session_attributes = {}
	card_title = "Hello World"
	speech_output = "Hello World"
	reprompt_text = ""
	should_end_session = True

	return build_response(session_attributes, build_speechlet_response(
        card_title, speech_output, reprompt_text, should_end_session))
####################################################################
def build_response(session_attributes, speechlet_response):
	return {
		"version": "1.0",
		"sessionAttributes": session_attributes,
		"response": speechlet_response
    }			
####################################################################
def build_speechlet_response(title, output, reprompt_text, should_end_session):
	#return data in json format to alexa skills kit
	return {
		"outputSpeech": {
     			"type": "PlainText",
     			"text": output
     		},
     		"card": {
     			"type": "Simple",
     			"title": title,
     			"content": output
     		},
     		"reprompt": {
     			"outputSpeech": {
     				"type": "PlainText",
     				"text": reprompt_text
     			}
     		},
     		"shouldEndSession": should_end_session
     	}
####################################################################