from datetime import datetime
import streamlit as st
import os
from mistralai import Mistral

# Function to get the current year
def current_year():
    now = datetime.now()
    return now.year

st.set_page_config(layout="wide")
st.title("Just chat! 🤖")

# Sidebar inputs for MISTRAL_API_ID and MISTRAL_API_KEY
with st.sidebar:
    st.header("Mistral API Settings")
    mistral_api_id = st.text_input("Enter your MISTRAL API ID", placeholder="Enter API ID")
    api_key = st.text_input("Enter your MISTRAL API Key", type="password", placeholder="Enter API Key")

    with st.expander("Instruction Manual"):
        st.markdown("""
            ## Mistral AI Agent 🤖 Chatbot
            This Streamlit app allows you to chat with Mistral AI Coder Agent.
            ### How to Use:
            1. **Input**: Type your prompt into the chat input box labeled "What is up?".
            2. **Response**: The app will display a response from Mistral AI.
            3. **Chat History**: Previous conversations will be shown on the app.
            ### Credits:
            - **Developer**: [Yiqiao Yin](https://www.y-yin.io/) | [App URL](https://huggingface.co/spaces/eagle0504/gpt-4o-demo) | [LinkedIn](https://www.linkedin.com/in/yiqiaoyin/) | [YouTube](https://youtube.com/YiqiaoYin/)
            Enjoy chatting with Mistral AI agent!
        """)

    with st.expander("Examples"):
        st.success("Example: Write a simple hello world flask app for me.")
        st.success("Example: Write a program to simulate the value of pi.")
        st.success("Example: Write a 3-layer neural network for me?")

    # Button to clear session state
    if st.button("Clear Session"):
        st.session_state.messages = []
        st.rerun()

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

# Ensure messages are a list of dictionaries
if not isinstance(st.session_state.messages, list):
    st.session_state.messages = []
if not all(isinstance(msg, dict) for msg in st.session_state.messages):
    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"])

# React to user input
if prompt := st.chat_input("😉 Ask any question or feel free to use the examples provided in the left sidebar."):

    # Display user message in chat message container
    st.chat_message("user").markdown(prompt)

    # Add user message to chat history
    st.session_state.messages.append({"role": "assistant", "content": f"You are a helpful assistant. Year now is {current_year()}"})
    st.session_state.messages.append({"role": "user", "content": prompt})

    # API Call
    if mistral_api_id and api_key:  # Ensure both API ID and Key are entered
        bot = ChatBot(api_key)
        bot.history = st.session_state.messages.copy()  # Update history from messages
        response = bot.generate_response(
            agent_id=mistral_api_id,
            user_message=prompt
        )

        # Display assistant response in chat message container
        with st.chat_message("assistant"):
            st.markdown(response)

        # Add assistant response to chat history
        st.session_state.messages.append({"role": "assistant", "content": response})
    else:
        st.error("Please enter both MISTRAL API ID and API Key in the sidebar.")