app.py

import streamlit as st
import requests
from PIL import Image
import base64

import streamlit as st
import streamlit_authenticator as stauth

import yaml
from yaml.loader import SafeLoader


class ChatbotApp:
    def __init__(self):
        # URL do backend (Flask)
        self.backend_url = "http://localhost:5001/chat"
        self.title = "Chatbot Carômetro"
        self.description = "Este assistente virtual pode te ajudar com informações sobre carômetros da Sicoob."

    def stream_chat(self, user_input):
        """
        Faz a comunicação com o backend e retorna a resposta como streaming de tokens.
        """
        try:
            response = requests.post(
                self.backend_url,
                json={"message": user_input},
                stream=True  # Ativa o streaming
            )
            response.raise_for_status()

            # Gera os tokens conforme chegam no streaming
            for chunk in response.iter_content(chunk_size=512):
                if chunk:
                    yield chunk.decode("utf-8")
        except Exception as e:
            yield f"Erro ao conectar ao servidor: {e}"

    def render_sidebar(self):
        """
        Exibe opções na barra lateral e renderiza a logo do Sicoob.
        """
        st.sidebar.title("Configuração de LLM")
        sidebar_option = st.sidebar.radio("Selecione o LLM", ["gpt-3.5-turbo"])
        if sidebar_option != "gpt-3.5-turbo":
            raise Exception("Opção de LLM inválida!")

        # Exibe a logo do Sicoob na barra lateral
        with open("sicoob-logo.png", "rb") as f:
            data = base64.b64encode(f.read()).decode("utf-8")
            st.sidebar.markdown(
                f"""
                <div style="display:table;margin-top:-80%;margin-left:0%;">
                    <img src="data:image/png;base64,{data}" width="250" height="70">
                </div>
                """,
                unsafe_allow_html=True,
            )

    def render(self):
        """
        Renderiza a interface do chatbot.
        """
        # Configura título, ícone e layout da página
        im = Image.open("pngegg.png")
        st.set_page_config(page_title="Chatbot Carômetro", page_icon=im, layout="wide")

        with open('./config.yaml') as file:
            config = yaml.load(file, Loader=SafeLoader)

        # Pre-hashing all plain text passwords once
        # stauth.Hasher.hash_passwords(config['credentials'])

        authenticator = stauth.Authenticate(
            config['credentials'],
            config['cookie']['name'],
            config['cookie']['key'],
            config['cookie']['expiry_days']
        )

        #try:
        #    authenticator.login()
        #except Exception as e:
        #    st.error(e)
            
        with open('./config.yaml', 'w', encoding='utf-8') as file:
            yaml.dump(config, file, default_flow_style=False)


        authentication_status = authenticator.login()

        if st.session_state["authentication_status"]:
            authenticator.logout('Logout', 'main')

            # Renderiza a barra lateral
            self.render_sidebar()

            # Título e descrição
            st.title(self.title)
            st.write(self.description)

            # Inicializa o histórico na sessão
            if "chat_history" not in st.session_state:
                st.session_state.chat_history = []

            # Renderiza as mensagens do histórico
            for message in st.session_state.chat_history:
                role, text = message.split(":", 1)
                with st.chat_message(role.strip().lower()):
                    st.write(text.strip())

            # Captura o input do usuário
            user_input = st.chat_input("Digite sua pergunta")
            if user_input:
                # Exibe a mensagem do usuário
                with st.chat_message("user"):
                    st.write(user_input)
                st.session_state.chat_history.append(f"user: {user_input}")

                # Placeholder para a resposta do assistente
                with st.chat_message("assistant"):
                    message_placeholder = st.empty()
                    assistant_message = ""

                    # Executa o streaming de tokens enquanto o backend responde
                    for token in self.stream_chat(user_input):
                        assistant_message += token
                        message_placeholder.markdown(assistant_message + "▌")

                    # Atualiza o placeholder com a mensagem final
                    message_placeholder.markdown(assistant_message)
                    st.session_state.chat_history.append(f"assistant: {assistant_message}")
        elif st.session_state["authentication_status"] == False:
            st.error('Username/password is incorrect')
        elif st.session_state["authentication_status"] == None:
            st.warning('Please enter your username and password')

if __name__ == "__main__":
    chatbot_app = ChatbotApp()
    chatbot_app.render()