import streamlit as st
from transformers import BartTokenizer, BartForConditionalGeneration, pipeline
import nltk
import os

# Download NLTK data
nltk.download('punkt')
from nltk.tokenize import sent_tokenize

# Define the directory to extract the model
model_path = './bart_model/bart_model'

# Verify that the directory exists and contains the necessary files
if not os.path.exists(model_path):
    st.error(f"Model directory {model_path} does not exist or is incorrect.")
    # Print out contents of model_dir for further debugging
    # print("Contents of model_dir:", os.listdir(model_dir))
else:
    # Load the tokenizer and model from the extracted directory
    tokenizer = BartTokenizer.from_pretrained(model_path)
    model = BartForConditionalGeneration.from_pretrained(model_path)

    # Create a summarization pipeline
    summarizer = pipeline("summarization", model=model, tokenizer=tokenizer)

    # Set the title for the Streamlit app
    st.title("BART Summary Generator")

    # Text input for the user
    text = st.text_area("Enter your text: ")

    def generate_summary(input_text):
        # Perform summarization
        summary = summarizer(input_text, max_length=200, min_length=40, do_sample=False)
        return summary[0]['summary_text']

    if st.button("Generate"):
        if text:
            generated_summary = generate_summary(text)
            # Display the generated summary
            st.subheader("Generated Summary")
            st.write(generated_summary)
        else:
            st.warning("Please enter some text to generate a summary.")