"""
Copyright (c) 2016-2020 Keith Sterling http://www.keithsterling.com

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, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
Software.

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 json
from programy.utils.logging.ylogger import YLogger
from programy.services.service import Service
from programy.services.requestsapi import RequestsAPI


class DuckDuckGoAPI:

    def __init__(self, request_api=None):
        if request_api is None:
            self._requests_api = RequestsAPI()
        else:
            self._requests_api = request_api

    # Provide a summary of a single article
    def ask_question(self, url, question, num_responses=1):
        # http://api.duckduckgo.com/?q=DuckDuckGo&format=json

        payload = {'q': question, 'format': 'json'}
        response = self._requests_api.get(url, params=payload)

        if response is None:
            raise Exception("No response from DuckDuckGo service")

        if response.status_code != 200:
            raise Exception("Error response from DuckDuckGo service [%d]" % response.status_code)

        json_data = json.loads(response.text)
        if 'RelatedTopics' not in json_data:
            raise Exception("Invalid response from DuckDuckGo service, 'RelatedTopcis' missing from payload")
        topics = json_data['RelatedTopics']

        if len(topics) == 0:
            raise Exception("Invalid response from DuckDuckGo service, no topics in payload")

        if len(topics) < num_responses:
            num_responses = len(topics)

        responses = []
        for i in range(num_responses):
            if 'Text' in topics[i]:
                sentences = topics[i]['Text'].split(".")
                responses.append(sentences[0])

        return ". ".join(responses)


class DuckDuckGoService(Service):

    def __init__(self, config=None, api=None):
        Service.__init__(self, config)

        if api is None:
            self._api = DuckDuckGoAPI()
        else:
            self._api = api

        self._url = None
        if config.url is None:
            raise Exception("Undefined url parameter")
        else:
            self._url = config.url

    def ask_question(self, client_context, question: str):
        try:
            return self._api.ask_question(self._url, question)
        except Exception as e:
            YLogger.error(client_context, "General error querying DuckDuckGo for question [%s] - [%s]", question,
                          str(e))
        return ""