import streamlit as st

from langchain.chat_models import ChatOpenAI
from langchain.schema import (
  AIMessage,
  HumanMessage,
  SystemMessage
)

# UI
st.set_page_config(page_title="Chat AI", page_icon=":robot:")
st.header("Hi! Ask me anything!")

if "sessionMessages" not in st.session_state :
  st.session_state.sessionMessages = [
    SystemMessage(content="You are helpful assistant")
  ]

def load_answer(question):
  st.session_state.sessionMessages.append(
    HumanMessage(content=question)
  )

  assistant_answer = chat(st.session_state.sessionMessages)
  st.session_state.sessionMessages.append(AIMessage(content=assistant_answer.content))

  return assistant_answer.content

def get_text():
  input_text = st.text_input("You:", key = input)
  return input_text

chat = ChatOpenAI(temperature=0)

user_input = get_text()
submit = st.button("send")

if submit:
  response = load_answer(user_input)
  st.subheader("answer")
  st.write(response, key=1)