import os
import streamlit as st
from st_aggrid import AgGrid
import pandas as pd
from transformers import pipeline, T5ForConditionalGeneration, T5Tokenizer

# Set the page layout for Streamlit
st.set_page_config(layout="wide")

# CSS styling
style = '''
    <style>
        body {background-color: #F5F5F5; color: #000000;}
        header {visibility: hidden;}
        div.block-container {padding-top:4rem;}
        section[data-testid="stSidebar"] div:first-child {
        padding-top: 0;
    }
     .font {                                          
    text-align:center;
    font-family:sans-serif;font-size: 1.25rem;}
    </style>
'''
st.markdown(style, unsafe_allow_html=True)

st.markdown('<p style="font-family:sans-serif;font-size: 1.5rem;text-align: right;"> HertogAI Table Q&A using TAPAS and Model Language</p>', unsafe_allow_html=True)
st.markdown('<p style="font-family:sans-serif;font-size: 0.7rem;text-align: right;"> This code is based on Jordan Skinner. I enhanced his work using Language Model T5</p>', unsafe_allow_html=True)
st.markdown("<p style='font-family:sans-serif;font-size: 0.6rem;text-align: right;'>Pre-trained TAPAS model runs on max 64 rows and 32 columns data. Make sure the file data doesn't exceed these dimensions.</p>", unsafe_allow_html=True)



# Initialize TAPAS pipeline
tqa = pipeline(task="table-question-answering", 
              model="google/tapas-large-finetuned-wtq",
              device="cpu")

# Initialize T5 tokenizer and model for text generation
t5_tokenizer = T5Tokenizer.from_pretrained("t5-small")
t5_model = T5ForConditionalGeneration.from_pretrained("t5-small")

# File uploader in the sidebar
file_name = st.sidebar.file_uploader("Upload file:", type=['csv', 'xlsx'])

# File processing and question answering
if file_name is None:
    st.markdown('<p class="font">Please upload an excel or csv file </p>', unsafe_allow_html=True)
else:
    try:
        # Check file type and handle reading accordingly
        if file_name.name.endswith('.csv'):
            df = pd.read_csv(file_name, sep=';', encoding='ISO-8859-1')  # Adjust encoding if needed
        elif file_name.name.endswith('.xlsx'):
            df = pd.read_excel(file_name, engine='openpyxl')  # Use openpyxl to read .xlsx files
        else:
            st.error("Unsupported file type")
            df = None

        # Continue with further processing if df is loaded
        if df is not None:
            numeric_columns = df.select_dtypes(include=['object']).columns
            for col in numeric_columns:
                df[col] = pd.to_numeric(df[col], errors='ignore')

            st.write("Original Data:")
            st.write(df)

            # Create a copy for numerical operations
            df_numeric = df.copy()
            df = df.astype(str)

            # Display the first 5 rows of the dataframe in an editable grid
            grid_response = AgGrid(
                df.head(5),
                columns_auto_size_mode='FIT_CONTENTS',
                editable=True, 
                height=300, 
                width='100%',
            )
            
    except Exception as e:
        st.error(f"Error reading file: {str(e)}")

    # User input for the question
    question = st.text_input('Type your question')

    # Process the answer using TAPAS and T5
    with st.spinner():
        if st.button('Answer'):
            try:
                # Get the raw answer from TAPAS
                raw_answer = tqa(table=df, query=question, truncation=True)
                
                st.markdown("<p style='font-family:sans-serif;font-size: 0.9rem;'> Raw Result From TAPAS: </p>",
                           unsafe_allow_html=True)
                st.success(raw_answer)
                
                # Extract relevant information from the TAPAS result
                answer = raw_answer['answer']
                aggregator = raw_answer.get('aggregator', '')
                coordinates = raw_answer.get('coordinates', [])
                cells = raw_answer.get('cells', [])
                
                # Construct a base sentence replacing 'SUM' with the query term
                base_sentence = f"The {question.lower()} of the selected data is {answer}."
                if coordinates and cells:
                    rows_info = [f"Row {coordinate[0] + 1}, Column '{df.columns[coordinate[1]]}' with value {cell}" 
                                 for coordinate, cell in zip(coordinates, cells)]
                    rows_description = " and ".join(rows_info)
                    base_sentence += f" This includes the following data: {rows_description}."

                # Generate a fluent response using the T5 model, rephrasing the base sentence
                input_text = f"Given the question: '{question}', generate a more human-readable response: {base_sentence}"

                # Tokenize the input and generate a fluent response using T5
                inputs = t5_tokenizer.encode(input_text, return_tensors="pt", max_length=512, truncation=True)
                summary_ids = t5_model.generate(inputs, max_length=150, num_beams=4, early_stopping=True)

                # Decode the generated text
                generated_text = t5_tokenizer.decode(summary_ids[0], skip_special_tokens=True)

                # Display the final generated response
                st.markdown("<p style='font-family:sans-serif;font-size: 0.9rem;'> Final Generated Response with LLM: </p>", unsafe_allow_html=True)
                st.success(generated_text)

            except Exception as e:
                st.warning("Please retype your question and make sure to use the column name and cell value correctly.")