# Copyright 2021 Zilliz. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
import requests
import json
from typing import List

from towhee.operator.base import PyOperator


class ErnieChat(PyOperator):
    '''Wrapper of OpenAI Chat API'''
    def __init__(self,
                 api_key: str = None,
                 secret_key: str = None,
                 **kwargs
                 ):
        self.api_key = api_key or os.getenv('ERNIE_API_KEY')
        self.secret_key = secret_key or os.getenv('ERNIE_SECRET_KEY')
        self.kwargs = kwargs

        try:
            self.access_token = self.get_access_token(api_key=self.api_key, secret_key=self.secret_key)
        except Exception as e:
            raise RuntimeError(f'Failed to get access token: {e}')
        self.url = 'https://aip.baidubce.com/rpc/2.0/ai_custom/v1/wenxinworkshop/chat/completions?access_token=' \
            + self.access_token

    def __call__(self, messages: List[dict]):
        messages = self.parse_inputs(messages)
        self.kwargs['messages'] = messages
        payload = json.dumps(self.kwargs)
        headers = {
            'Content-Type': 'application/json'
        }
    
        response = requests.request('POST', self.url, headers=headers, data=payload)
    
        # if self.kwargs.get('stream', False):
        #     return self.stream_output(response)
        
        answer = response.json()['result']
        return answer

    def parse_inputs(self, messages: List[dict]):
        assert isinstance(messages, list), \
            'Inputs must be a list of dictionaries with keys from ["question", "answer"] or ["role", "content"].'
        new_messages = []
        for m in messages:
            if ('role' and 'content' in m) and (m['role'] in ['assistant', 'user']):
                new_messages.append(m)
            else:
                for k, v in m.items():
                    if k == 'question':
                        new_m = {'role': 'user', 'content': v}
                    elif k == 'answer':
                        new_m = {'role': 'assistant', 'content': v}
                    else:
                        raise KeyError('Invalid message key: only accept key value from ["question", "answer"].')
                    new_messages.append(new_m)
        return new_messages
    
    def stream_output(self, response):
         # todo
         pass
    
    @staticmethod
    def get_access_token(api_key, secret_key):
        url = 'https://aip.baidubce.com/oauth/2.0/token'
        params = {
            'grant_type': 'client_credentials',
            'client_id': api_key,
            'client_secret': secret_key
            }
        return str(requests.post(url, params=params).json().get('access_token'))