import flask
from flask import Flask, request, jsonify
from langchain.document_loaders import WebBaseLoader
from langchain.chains.summarize import load_summarize_chain
from bs4 import BeautifulSoup
import os
from dotenv import load_dotenv
load_dotenv()
from langchain import HuggingFaceHub
from huggingface_hub import InferenceClient
import requests
import sys

hf_token = os.environ.get('HUGGINGFACEHUB_API_TOKEN')
#starchat_repo_id = os.environ.get('starchat_repo_id')
#repo_id=os.environ.get('repo_id')
#port = os.getenv('port')

llm = HuggingFaceHub(repo_id=starchat_repo_id, #for StarChat                                  
                     huggingfacehub_api_token=hf_token,
                     model_kwargs={"min_length":512,  #for StarChat                                   
                                   "max_new_tokens":1024, "do_sample":True,  #for StarChat                                                                    
                                   "temperature":0.01,
                                   "top_k":50,
                                   "top_p":0.95, "eos_token_id":49155}) 
chain = load_summarize_chain(llm, chain_type="stuff")

app = Flask(__name__)
@app.route('/', methods=['POST'])
def home_api():
    data = request.get_json()
    user_query = data['user_question']
    print(user_query)
    return {"Message":"Flask Home API Deploy Success on HF"}  

@app.route('/api/chat', methods=['POST'])
def chat():
#async def chat():  #Failed - Flask API 不支持async???
    data = request.get_json()
    user_query = data['user_question']
    print(user_query)
    if user_query !="" and not user_query.strip().isspace() and not user_query == "" and not user_query.strip() == "" and not user_query.isspace():
        try:
            loader = WebBaseLoader(user_query)
            print(user_query)
            docs = loader.load()
            result=chain.run(docs)            
            print("AI Summarization: "+result) 
            return jsonify({'response': result})
        except Exception as e:        
            err_msg="Wrong URL or URL not parsable."
            print(err_msg)
            return jsonify({'response': err_msg})