app.py

import os
import pandas as pd
import json
import gradio as gr
from openai import AzureOpenAI
from PyPDF2 import PdfReader
from gradio.themes.base import Base
from gradio.themes.utils import colors, fonts, sizes
import base64

class BaseTheme(Base):
    def __init__(
        self,
        *,
        primary_hue: colors.Color | str = colors.orange,
        secondary_hue: colors.Color | str = colors.blue,
        neutral_hue: colors.Color | str = colors.gray,
        spacing_size: sizes.Size | str = sizes.spacing_md,
        radius_size: sizes.Size | str = sizes.radius_md,
        text_size: sizes.Size | str = sizes.text_lg,
    ):
        super().__init__(
            primary_hue=primary_hue,
            secondary_hue=secondary_hue,
            neutral_hue=neutral_hue,
            spacing_size=spacing_size,
            radius_size=radius_size,
            text_size=text_size,
        )

basetheme = BaseTheme()

js_func = """
function refresh() {
    const url = new URL(window.location);

    if (url.searchParams.get('__theme') !== 'dark') {
        url.searchParams.set('__theme', 'dark');
        window.location.href = url.href;
    }
}
"""
# ===============================
# Azure OpenAI setup
# ===============================
os.environ["AZURE_OPENAI_ENDPOINT"] = os.getenv("AZURE_OPENAI_ENDPOINT")
os.environ["AZURE_OPENAI_API_KEY"] = os.getenv("AZURE_OPENAI_API_KEY") # Replace with your actual API key

client = AzureOpenAI(
    api_version="2023-05-15",
    azure_deployment="gpt-4o",  # Replace with your actual model deployment name
)

# ===============================
# Helper Functions
# ===============================

def parse_field_definitions(field_text):
    """
    Converts user-entered lines in the format:
       Field Name: Description
    into a dictionary { "Field Name": "Description", ... }.
    Lines without a colon are ignored or added with an empty description.
    """
    user_fields = {}
    lines = field_text.split("\n")
    for line in lines:
        line = line.strip()
        if not line:
            continue
        if ":" in line:
            # Split on the first colon
            field, description = line.split(":", 1)
            field = field.strip()
            description = description.strip()
            user_fields[field] = description
        else:
            # If no colon is found, treat entire line as a field with an empty description
            user_fields[line] = ""
    return user_fields

def read_file_metadata(file_path):
    df = pd.read_csv(file_path)
    column_names = list(df.columns)
    sample_columns = column_names[:2]
    sample_data = df[sample_columns].iloc[0].to_dict() if len(df) > 0 else {}
    return column_names, sample_data

def read_excel_metadata(file_path):
    df = pd.read_excel(file_path)
    column_names = list(df.columns)
    sample_columns = column_names[:2]
    sample_data = df[sample_columns].iloc[0].to_dict() if len(df) > 0 else {}
    return column_names, sample_data

def create_column_mapping_prompt(file_metadata, user_fields):
    prompt = (
        "You are given CSV/Excel data from different sources. The files contain columns with similar content but with different names.\n"
        "The user has provided the following desired fields and their descriptions:\n"
        f"{json.dumps(user_fields, indent=2)}\n\n"
        "For each file, here are the details (showing example data from the first two columns):\n\n"
    )
    for file_path, column_names, sample_data in file_metadata:
        prompt += f"File: {file_path}\n"
        prompt += f"Columns: {column_names}\n"
        prompt += f"Example Data (first two columns): {sample_data}\n\n"
    prompt += (
        "Your task is to map the existing column names from each file to the desired fields provided by the user. "
        "For each desired field, decide which column name in each file best represents it. "
        "If a field cannot be found, map it to an empty string.\n\n"
        "Return the mapping in JSON format with the following structure:\n"
        "{\n"
        '  "desired_field1": { "source_file1": "matched_column_name_or_empty", "source_file2": "matched_column_name_or_empty", ... },\n'
        '  "desired_field2": { ... },\n'
        "  ...\n"
        "}\n\n"
        "Do not include any additional text in your response."
    )
    return prompt

def get_column_mapping(file_metadata, user_fields):
    column_match_prompt = create_column_mapping_prompt(file_metadata, user_fields)
    completion = client.chat.completions.create(
        model="gpt-4o",
        messages=[{"role": "user", "content": column_match_prompt}],
        temperature=0.1,
        response_format={"type": "json_object"},
    )

    try:
        response_text = completion.choices[0].message.content.strip()
        result_mapping = json.loads(response_text)
    except Exception as e:
        raise ValueError(
            f"Error parsing LLM response: {e}\n\nResponse:\n{completion.choices[0].message.content}"
        )

    return result_mapping

def merge_files_with_mapping(file_paths, user_fields):
    file_metadata = []
    for file_path in file_paths:
        if file_path.lower().endswith('.csv'):
            columns, sample_data = read_file_metadata(file_path)
        elif file_path.lower().endswith(('.xlsx', '.xls')):
            columns, sample_data = read_excel_metadata(file_path)
        else:
            continue
        file_metadata.append((file_path, columns, sample_data))

    # Ask the LLM for a column mapping
    mapping = get_column_mapping(file_metadata, user_fields) if file_metadata else {}

    all_data = []
    for file_path in file_paths:
        if file_path.lower().endswith('.csv'):
            df = pd.read_csv(file_path)
        elif file_path.lower().endswith(('.xlsx', '.xls')):
            df = pd.read_excel(file_path)
        else:
            continue

        new_columns = {}
        for desired_field, file_mapping in mapping.items():
            source_column = ""
            if file_path in file_mapping:
                source_column = file_mapping[file_path]
            else:
                base_name = os.path.basename(file_path)
                source_column = file_mapping.get(base_name, "")

            if source_column and source_column in df.columns:
                new_columns[source_column] = desired_field

        df.rename(columns=new_columns, inplace=True)
        all_data.append(df)

    if not all_data:
        raise ValueError("No valid CSV/Excel files to merge.")

    final_df = pd.concat(all_data, ignore_index=True)
    # Only keep columns in the order the user specified
    desired_columns = list(user_fields.keys())
    final_df = final_df.reindex(columns=desired_columns)

    final_df.to_csv("merged_data.csv", index=False)
    return final_df

def combine_all_data(file_paths, user_fields):
    final_df = merge_files_with_mapping(file_paths, user_fields)

    desired_columns = list(user_fields.keys())
    final_df = final_df.reindex(columns=desired_columns)

    final_df.to_csv("merged_all_data.csv", index=False)
    absolute_path = os.path.abspath("merged_all_data.csv")
    return final_df,absolute_path

# ===============================
# Gradio Interface Function
# ===============================
def process_data(files, field_text):
    """
    Main function for Gradio to handle user inputs:
    - files: list of CSV/Excel files
    - pdf_file: a single PDF file
    - field_text: multiline text with lines in the form: "Field Name: Description"
    """

    # Parse the user's desired fields from multiline text
    user_fields = parse_field_definitions(field_text)
    if not user_fields:
        return "No valid fields found. Please use the format:\n\nField Name: Description"

    file_paths = [f.name for f in files] if files else []

    try:
        final_df, absolute_path = combine_all_data(file_paths, user_fields)
    except Exception as e:
        return f"Error during processing: {e}"

    return final_df, absolute_path

with open("Frame 1.png", "rb") as logo_file:
    base64_logo = base64.b64encode(logo_file.read()).decode("utf-8")

# ===============================
# Gradio UI
# ===============================
with gr.Blocks(theme=basetheme,js=js_func,fill_height=True) as demo:
    # Add logo at the top using Base64 HTML
    with gr.Row():
        gr.HTML(
            f"""
                <div style="display: grid; grid-template-columns: 1fr 2fr 1fr; align-items: center;">
                    <div style="justify-self: start;">
                        <img src="data:image/png;base64,{base64_logo}" alt="Logo" style="width: 150px; height: auto;">
                    </div>
                    <div style="justify-self: center;">
                        <h2 style="margin: 0; text-align: center;">AI Data Transformation with User-Selected Fields</h2>
                    </div>
                    <div></div>
                </div>
            """
        )
    gr.Interface(
    fn=process_data,
    inputs=[
        gr.File(label="Upload CSV/Excel files", file_count="multiple",file_types=[".csv", ".xlsx", ".xls"]),
        gr.Textbox(
            label="Desired Fields (one per line, use 'Field Name: Description' format)",
            placeholder="Example:\nName: Full name\nDOB: Date of birth\nAddress: Full address\n",
            lines=6,
        ),
    ],
    outputs=[gr.Dataframe(label="Final Merged Data"),gr.File(label="Download CSV")],
    description=(
        "Upload one or more CSV/Excel files and enter your desired fields below. "
        "Type each field on a new line in the format:\n"
        "'Field Name: Description'\n\n"
        "The AI will automatically map and merge columns from your files to these fields."
    ),
)

if __name__ == "__main__":
    # Launch the Gradio app
    demo.launch()