#
# Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#

import time
import logging
import json
import bibot_helpers as helpers
import bibot_userexits as userexits
import count_intent
import top_intent

#
# See additional configuration parameters at bottom 
#

logger = logging.getLogger()
logger.setLevel(logging.DEBUG)


def lambda_handler(event, context):
    logger.debug('<<BIBot>> Lex event info = ' + json.dumps(event))

    session_attributes = event['sessionAttributes']
    logger.debug('<<BIBot>> lambda_handler: session_attributes = ' + json.dumps(session_attributes))

    config_error = helpers.get_bibot_config()
    if config_error is not None:
        return helpers.close(session_attributes, 'Fulfilled',
            {'contentType': 'PlainText', 'content': config_error})   
    else:
        return switch_intent_handler(event, session_attributes)


def switch_intent_handler(intent_request, session_attributes):
    session_attributes['greetingCount'] = '0'
    session_attributes['resetCount'] = '0'
    session_attributes['finishedCount'] = '0'
    # note: do not alter session_attributes['lastIntent'] here

    if session_attributes.get('lastIntent', None) is not None:
        intent_name = session_attributes['lastIntent']
        if INTENT_CONFIG.get(intent_name, False):
            logger.debug('<<BIBot>> switch_intent_handler: session_attributes = ' + json.dumps(session_attributes))
            logger.debug('<<BIBot>> switch_intent_handler: refirecting to ' + intent_name)
            return INTENT_CONFIG[intent_name]['handler'](intent_request, session_attributes)    # dispatch to the event handler
        else:
            return helpers.close(session_attributes, 'Fulfilled',
                {'contentType': 'PlainText', 'content': 'Sorry, I don\'t support the intent called "' + intent_name + '".'})
    else:
        return helpers.close(session_attributes, 'Fulfilled',
            {'contentType': 'PlainText', 'content': 'Sorry, I\'m not sure what you\'re asking me.'})


INTENT_CONFIG = {
    'Top_Intent':       {'handler': top_intent.top_intent_handler},
    'Count_Intent':     {'handler': count_intent.count_intent_handler}
}