"""
This file is based on the alexa-skills-kit-color-expert-python that is available
as a Python blueprint for Amazon Lambda. This contains much of the functionality
that you might need to build a production-ready Alexa skill.

For additional samples, visit the Alexa Skills Kit Getting Started guide at
http://amzn.to/1LGWsLG
"""

from __future__ import print_function
import wordsmith_basic as wordsmith

WORDSMITH_API_KEY = '<YOUR API KEY HERE>'
WORDSMITH_PROJECT_SLUG = '<YOUR PROJECT SLUG HERE>'
WORDSMITH_TEMPLATE_SLUG = '<YOUR TEMPLATE SLUG HERE>'

# --------------- Helpers that build all of the responses ----------------------

def build_speechlet_response(title, output, reprompt_text, should_end_session):
    return {
        'outputSpeech': {
            'type': 'PlainText',
            'text': output
        },
        'card': {
            'type': 'Simple',
            'title': "SessionSpeechlet - " + title,
            'content': "SessionSpeechlet - " + output
        },
        'reprompt': {
            'outputSpeech': {
                'type': 'PlainText',
                'text': reprompt_text
            }
        },
        'shouldEndSession': should_end_session
    }


def build_response(session_attributes, speechlet_response):
    return {
        'version': '1.0',
        'sessionAttributes': session_attributes,
        'response': speechlet_response
    }


# --------------- Functions that control the skill's behavior ------------------

def get_welcome_response():
    """ If we wanted to initialize the session to have some attributes we could
    add those here
    """

    session_attributes = {}
    card_title = "<YOUR WELCOME CARD TITLE HERE>"
    speech_output = "<YOUR WELCOME MESSAGE HERE>"
    # If the user either does not reply to the welcome message or says something
    # that is not understood, they will be prompted again with this text.
    reprompt_text = "<YOUR REPROMPT TEXT HERE>"
    should_end_session = False
    return build_response(session_attributes, build_speechlet_response(
        card_title, speech_output, reprompt_text, should_end_session))


def handle_session_end_request():
    card_title = "<YOUR SESSION END CARD TITLE HERE>"
    speech_output = "<YOUR SESSION END MESSAGE HERE"
    # Setting this to true ends the session and exits the skill.
    should_end_session = True
    return build_response({}, build_speechlet_response(
        card_title, speech_output, None, should_end_session))

# --------------- Events ------------------

def on_session_started(session_started_request, session):
    """ Called when the session starts """
    print("on_session_started requestId=" + session_started_request['requestId']
          + ", sessionId=" + session['sessionId'])
    # any initialization logic goes here

def on_launch(launch_request, session):
    """ Called when the user launches the skill without specifying what they
    want
    """
    print("on_launch requestId=" + launch_request['requestId'] +
          ", sessionId=" + session['sessionId'])
    # Dispatch to your skill's launch
    return get_welcome_response()


def on_intent(intent_request, session):
    """ Called when the user specifies an intent for this skill """

    print("on_intent requestId=" + intent_request['requestId'] +
          ", sessionId=" + session['sessionId'])

    intent = intent_request['intent']
    intent_name = intent_request['intent']['name']

    # Dispatch to your skill's intent handlers
    if intent_name == "<YOUR INTENT NAME HERE>":
        # Update the wordsmith_data variable with your data. Use key, value
        # pairs where the key is the column name in Wordsmith and the value is
        # the value contained in that column
        wordsmith_data = { 'column1': 'value1', 'column2': 'value2' }
        narrative = wordsmith.generate(WORDSMITH_API_KEY, WORDSMITH_PROJECT_SLUG, WORDSMITH_TEMPLATE_SLUG, wordsmith_data)
        if 'errors' not in narrative:
            return build_response(session.get('attributes', {}), build_speechlet_response('Wordsmith Generated Response', narrative['data']['content'],
                '<REPROMPT TEXT HERE>', True))
        else:
            if not isinstance(narrative['errors'], list) :
                return build_response(session.get('attributes', {}), build_speechlet_response('Wordsmith Generation Error', 'Wordsmith reported the following error: {}'.format(narrative['errors']['detail']),
                    '<REPROMPT TEXT HERE>', True))
            else:
                details = ', '.join([e['details'] for e in narrative['errors']])
                return build_response(session.get('attributes', {}), build_speechlet_response('Wordsmith Generation Error', 'Wordsmith reported the following error: {}'.format(details),
                    '<REPROMPT TEXT HERE>', True))
    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):
    """ Called when the user ends the session.

    Is not called when the skill returns should_end_session=true
    """
    print("on_session_ended requestId=" + session_ended_request['requestId'] +
          ", sessionId=" + session['sessionId'])
    # add cleanup logic here


# --------------- Main handler ------------------

def lambda_handler(event, context):
    """ Route the incoming request based on type (LaunchRequest, IntentRequest,
    etc.) The JSON body of the request is provided in the event parameter.
    """
    print("event.session.application.applicationId=" +
          event['session']['application']['applicationId'])

    """
    Uncomment this if statement and populate with your skill's application ID to
    prevent someone else from configuring a skill that sends requests to this
    function.
    """
    # if (event['session']['application']['applicationId'] !=
    #         "amzn1.echo-sdk-ams.app.[unique-value-here]"):
    #     raise ValueError("Invalid Application ID")

    if event['session']['new']:
        on_session_started({'requestId': event['request']['requestId']},
                           event['session'])

    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'])
