import streamlit as st
from openai import OpenAI
import time
import datetime
import os

# Securely get credentials
generated_user = os.getenv("User")
generated_password = os.getenv("Password")
openai_key = os.getenv("openai_key")

# Streamlit app configuration
st.set_page_config(page_title="Carfind.co.za AI Assistant", layout="wide")
st.title("🚗 Carfind.co.za AI Assistant")
st.caption("Chat with Carfind.co.za and find your next car fast")

# Initialize authentication state
if "authenticated" not in st.session_state:
    st.session_state.authenticated = False

# Login screen
if not st.session_state.authenticated:
    st.subheader("🔐 Login")
    username = st.text_input("Username")
    password = st.text_input("Password", type="password")

    if username and password:
        if username == generated_user and password == generated_password:
            st.session_state.authenticated = True
            st.success("Login successful! Redirecting...")
            time.sleep(1)
            st.rerun()
        else:
            st.error("Incorrect username or password. Please try again.")

# Main chat interface
else:
    st.divider()

    if "messages" not in st.session_state:
        st.session_state["messages"] = []

    # Display chat history
    for message in st.session_state.messages:
        role = message["role"]
        content = message["content"]
        if role == "assistant":
            st.markdown(f'<img src="https://www.carfind.co.za/images/Carfind-Icon.svg" width="30" style="vertical-align: middle;"> <strong>Carfind Assistant:</strong> {content}', unsafe_allow_html=True)
        else:
            st.chat_message(role).write(content)

    # Input with clear chat button
    col_clear, col_input = st.columns([1, 8])

    with col_clear:
        if st.button("🧹 Clear Chat"):
            st.session_state.messages = []
            st.success("Chat history cleared.")

    with col_input:
        user_input = st.chat_input("Type your message here...")

    if openai_key:
        client = OpenAI(api_key=openai_key)
        ASSISTANT_ID = "asst_5gQR21fOsmHil11FGBzEArA7"

        def save_transcript(messages):
            with open("chat_logs.txt", "a") as log:
                log.write(f"\n--- New Chat ({datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')}) ---\n")
                for msg in messages:
                    log.write(f"{msg['role'].capitalize()}: {msg['content']}\n")
                log.write("--- End Chat ---\n")

        if user_input:
            if len(st.session_state.messages) == 0 or user_input != st.session_state.messages[-1]["content"]:
                st.session_state.messages.append({"role": "user", "content": user_input})
                st.chat_message("user").write(user_input)

                try:
                    thread = client.beta.threads.create()
                    thread_id = thread.id

                    client.beta.threads.messages.create(
                        thread_id=thread_id,
                        role="user",
                        content=user_input
                    )

                    run = client.beta.threads.runs.create(
                        thread_id=thread_id,
                        assistant_id=ASSISTANT_ID
                    )

                    while True:
                        run_status = client.beta.threads.runs.retrieve(
                            thread_id=thread_id,
                            run_id=run.id
                        )
                        if run_status.status == "completed":
                            break
                        time.sleep(1)

                    messages = client.beta.threads.messages.list(thread_id=thread_id)
                    assistant_message = messages.data[0].content[0].text.value.strip()

                    if assistant_message.lower() != user_input.lower():
                        st.markdown(f'<img src="https://www.carfind.co.za/images/Carfind-Icon.svg" width="30" style="vertical-align: middle;"> <strong>Carfind Assistant:</strong> {assistant_message}', unsafe_allow_html=True)
                        st.session_state.messages.append({"role": "assistant", "content": assistant_message})
                        save_transcript(st.session_state.messages)

                except Exception as e:
                    st.error(f"An error occurred: {str(e)}")
    else:
        st.error("OpenAI key not found. Please ensure it is set as a Hugging Face secret.")