import streamlit as st
import replicate
import os

# App title
st.set_page_config(page_title="Snowflake Arctic")

# Replicate Credentials
with st.sidebar:
    st.title('Snowflake Arctic')
    if 'REPLICATE_API_TOKEN' in st.secrets:
        #st.success('API token loaded!', icon='✅')
        replicate_api = st.secrets['REPLICATE_API_TOKEN']
    else:
        replicate_api = st.text_input('Enter Replicate API token:', type='password')
        if not (replicate_api.startswith('r8_') and len(replicate_api)==40):
            st.warning('Please enter your Replicate API token.', icon='⚠️')
            st.markdown("**Don't have an API token?** Head over to [Replicate](https://replicate.com) to sign up for one.")
        #else:
        #    st.success('API token loaded!', icon='✅')

    os.environ['REPLICATE_API_TOKEN'] = replicate_api
    st.subheader("Adjust model parameters")
    temperature = st.sidebar.slider('temperature', min_value=0.01, max_value=5.0, value=0.6, step=0.01)
    top_p = st.sidebar.slider('top_p', min_value=0.01, max_value=1.0, value=0.9, step=0.01)

# Store LLM-generated responses
if "messages" not in st.session_state.keys():
    st.session_state.messages = [{"role": "assistant", "content": "Hi. I'm Arctic, a new, efficient, intelligent, and truly open language model created by Snowflake AI Research. Ask me anything."}]

# Display or clear chat messages
for message in st.session_state.messages:
    with st.chat_message(message["role"]):
        st.write(message["content"])

def clear_chat_history():
    st.session_state.messages = [{"role": "assistant", "content": "Hi. I'm Arctic, a new, efficient, intelligent, and truly open language model created by Snowflake AI Research. Ask me anything."}]
st.sidebar.button('Clear chat history', on_click=clear_chat_history)

st.sidebar.caption('Built by [Snowflake](https://snowflake.com/) to demonstrate [Snowflake Arctic](https://www.snowflake.com/blog/arctic-open-and-efficient-foundation-language-models-snowflake).')

# Function for generating Snowflake Arctic response
def generate_arctic_response():
    prompt = []
    for dict_message in st.session_state.messages:
        if dict_message["role"] == "user":
            prompt.append("<|im_start|>user\n" + dict_message["content"] + "<|im_end|>")
        else:
            prompt.append("<|im_start|>assistant\n" + dict_message["content"] + "<|im_end|>")
    
    prompt.append("<|im_start|>assistant")
    prompt.append("")
    
    for event in replicate.stream("snowflake/snowflake-arctic-instruct",
                           input={"prompt": "\n".join(prompt),
                                  "prompt_template": r"{prompt}",
                                  "temperature": temperature,
                                  "top_p": top_p,
                                  }):
        yield str(event)

# User-provided prompt
if prompt := st.chat_input(disabled=not replicate_api):
    st.session_state.messages.append({"role": "user", "content": prompt})
    with st.chat_message("user"):
        st.write(prompt)

# Generate a new response if last message is not from assistant
if st.session_state.messages[-1]["role"] != "assistant":
    with st.chat_message("assistant"):
        response = generate_arctic_response()
        full_response = st.write_stream(response)
    message = {"role": "assistant", "content": full_response}
    st.session_state.messages.append(message)