import streamlit as st
import time
import uuid
import requests
import os
import json

chat_url = os.environ['CHAT_URL']
# Streamed response emulator
def response_generator(user_input):
    payload = json.dumps({
      "user_query": user_input,
      "thread_id": st.session_state.session_id
    })
    headers = {
      'Content-Type': 'application/json'
    }

    response = requests.request("POST", chat_url, headers=headers, data=payload)

    ai_response = response.json()['ai_response']

    for character in ai_response:
        yield character
        time.sleep(0.001)


st.title("BookBot 📚 🤖")


if "session_id" not in st.session_state:
    st.session_state.session_id = str(uuid.uuid4())

# Initialize chat history
if "messages" not in st.session_state:
    st.session_state.messages = []

# Display chat messages from history on app rerun
for message in st.session_state.messages:
    with st.chat_message(message["role"]):
        st.markdown(message["content"])

# Accept user input
if user_input := st.chat_input("What is up?"):
    # Add user message to chat history
    st.session_state.messages.append({"role": "user", "content": user_input.strip()})
    # Display user message in chat message container
    with st.chat_message("user"):
        st.markdown(user_input)

    # Display assistant response in chat message container
    with st.chat_message("assistant"):
        response = st.write_stream(response_generator(user_input.strip()))
    # Add assistant response to chat history
    st.session_state.messages.append({"role": "assistant", "content": response})