import streamlit as st
from huggingface_hub import InferenceClient
import os
from typing import Iterator


API_KEY = os.getenv("TOGETHER_API_KEY")
if not API_KEY:
    raise ValueError("API key is missing! Make sure TOGETHER_API_KEY is set in the Secrets.")


# Initialize the client with Together AI provider
@st.cache_resource
def get_client():
    return InferenceClient(
        provider="together",
         api_key=API_KEY
    )

def process_file(file) -> str:
    """Process uploaded file and return its content"""
    if file is None:
        return ""
    
    try:
        content = file.getvalue().decode('utf-8')
        return content
    except Exception as e:
        return f"Error reading file: {str(e)}"

def generate_response(
    message: str,
    history: list[tuple[str, str]],
    system_message: str,
    max_tokens: int,
    temperature: float,
    top_p: float,
    file=None
) -> Iterator[str]:
    """Generate streaming response from the model"""
    client = get_client()
    
    # Process file if uploaded
    file_content = process_file(file) if file else ""
    
    # If there's file content, append it to the message
    if file_content:
        message = f"File content:\n{file_content}\n\nUser message:\n{message}"

    messages = [{"role": "system", "content": system_message}]

    # Add conversation history
    for user_msg, assistant_msg in history:
        if user_msg:
            messages.append({"role": "user", "content": user_msg})
        if assistant_msg:
            messages.append({"role": "assistant", "content": assistant_msg})

    # Add current message
    messages.append({"role": "user", "content": message})

    try:
        stream = client.chat.completions.create(
            model="deepseek-ai/DeepSeek-R1",
            messages=messages,
            max_tokens=max_tokens,
            stream=True,
            temperature=temperature,
            top_p=top_p,
        )
        
        for chunk in stream:
            if chunk.choices and chunk.choices[0].delta and chunk.choices[0].delta.content:
                yield chunk.choices[0].delta.content
                
    except Exception as e:
        yield f"Error: {str(e)}"

def main():
    st.set_page_config(page_title="DeepSeek Chat", page_icon="💭", layout="wide")
    
    # Initialize session state for chat history
    if "messages" not in st.session_state:
        st.session_state.messages = []

    st.title("DeepSeek Chat with File Upload")
    st.markdown("Chat with DeepSeek AI model. You can optionally upload files for the model to analyze.")

    # Sidebar for parameters
    with st.sidebar:
        st.header("Settings")
        system_message = st.text_area(
            "System Message",
            value="You are a friendly Chatbot.",
            height=100
        )
        max_tokens = st.slider(
            "Max Tokens",
            min_value=1,
            max_value=8192,
            value=8192,
            step=1
        )
        temperature = st.slider(
            "Temperature",
            min_value=0.1,
            max_value=4.0,
            value=0.0,
            step=0.1
        )
        top_p = st.slider(
            "Top-p (nucleus sampling)",
            min_value=0.1,
            max_value=1.0,
            value=0.95,
            step=0.05
        )
        uploaded_file = st.file_uploader(
            "Upload File (optional)",
               type=['txt', 'py', 'md', 'swift', 'java', 'js', 'ts', 'rb', 'go', 
                'php', 'c', 'cpp', 'h', 'hpp', 'cs', 'html', 'css', 'kt']
        )

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

    # Chat input
    if prompt := st.chat_input("What would you like to know?"):
        # Display user message
        st.session_state.messages.append({"role": "user", "content": prompt})
        with st.chat_message("user"):
            st.write(prompt)

        # Generate and display assistant response
        with st.chat_message("assistant"):
            response_placeholder = st.empty()
            full_response = ""
            
            # Get message history for context
            history = [(msg["content"], next_msg["content"]) 
                      for msg, next_msg in zip(st.session_state.messages[::2], st.session_state.messages[1::2])]
            
            # Stream the response
            for response_chunk in generate_response(
                prompt,
                history,
                system_message,
                max_tokens,
                temperature,
                top_p,
                uploaded_file
            ):
                full_response += response_chunk
                print(full_response)
                response_placeholder.markdown(full_response + "▌")
            
            response_placeholder.markdown(full_response)
        
        # Add assistant response to chat history
        st.session_state.messages.append({"role": "assistant", "content": full_response})

if __name__ == "__main__":
    main()