app.py

import json
import openai
import gradio as gr
import duckdb
from functools import lru_cache
import pandas as pd
import plotly.express as px
import os
from openai import OpenAI

# Set OpenAI API key
client = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))

# =========================
# Configuration and Setup
# =========================

# Load the Parquet dataset path
dataset_path = 'sample_contract_df.parquet'  # Update with your Parquet file path

# Provided schema
schema = [
    {"column_name": "department_ind_agency", "column_type": "VARCHAR"},
    {"column_name": "cgac", "column_type": "BIGINT"},
    # Additional columns go here...
]

@lru_cache(maxsize=1)
def get_schema():
    return schema

COLUMN_TYPES = {col['column_name']: col['column_type'] for col in get_schema()}

# =========================
# Database Interaction
# =========================

def load_dataset_schema():
    """
    Loads the dataset schema into DuckDB by creating a view.
    """
    con = duckdb.connect()
    try:
        con.execute("DROP VIEW IF EXISTS contract_data")
        con.execute(f"CREATE VIEW contract_data AS SELECT * FROM '{dataset_path}'")
        return True
    except Exception as e:
        print(f"Error loading dataset schema: {e}")
        return False
    finally:
        con.close()

# =========================
# OpenAI API Integration
# =========================

async def parse_query(nl_query):
    """
    Converts a natural language query into a SQL query using OpenAI's API.
    """
    messages = [
        {"role": "system", "content": "Convert natural language queries to SQL queries for 'contract_data'."},
        {"role": "user", "content": f"Schema:\n{json.dumps(schema, indent=2)}\n\nQuery:\n\"{nl_query}\"\n\nSQL:"}
    ]

    try:
        response =  openai.chat.completions.create(
            model="gpt-4",
            messages=messages,
            temperature=0,
            max_tokens=150,
        )
        sql_query = response.choices[0].message.content.strip()
        return sql_query
    except Exception as e:
        return f"Error generating SQL query: {e}"

# =========================
# Plotting Utilities
# =========================

def detect_plot_intent(nl_query):
    """
    Detects if the user's query involves plotting.
    """
    plot_keywords = ['plot', 'graph', 'chart', 'distribution', 'visualize']
    return any(keyword in nl_query.lower() for keyword in plot_keywords)

async def generate_sql_and_plot_code(query):
    """
    Generates SQL query and optional plotting code.
    """
    is_plot = detect_plot_intent(query)
    sql_query = await parse_query(query)
    plot_code = ""
    if is_plot and not sql_query.startswith("Error"):
        plot_code = """
import plotly.express as px
fig = px.bar(result_df, x='x_column', y='y_column', title='Generated Plot')
fig.update_layout(title_x=0.5)
"""
    return sql_query, plot_code

def execute_query(sql_query):
    """
    Executes the SQL query and returns the results.
    """
    if sql_query.startswith("Error"):
        return None, sql_query

    try:
        con = duckdb.connect()
        con.execute(f"CREATE OR REPLACE VIEW contract_data AS SELECT * FROM '{dataset_path}'")
        result_df = con.execute(sql_query).fetchdf()
        con.close()
        return result_df, ""
    except Exception as e:
        return None, f"Error executing query: {e}"

def generate_plot(plot_code, result_df):
    """
    Executes the plot code to generate a plot from the result DataFrame.
    """
    if not plot_code.strip():
        return None, "No plot code provided."
    try:
        columns = result_df.columns.tolist()
        if len(columns) < 2:
            return None, "Not enough columns to plot."
        plot_code = plot_code.replace('x_column', columns[0])
        plot_code = plot_code.replace('y_column', columns[1])
        local_vars = {'result_df': result_df, 'px': px}
        exec(plot_code, {}, local_vars)
        fig = local_vars.get('fig', None)
        return fig, "" if fig else "Plot could not be generated."
    except Exception as e:
        return None, f"Error generating plot: {e}"

# =========================
# Gradio Application UI
# =========================

with gr.Blocks() as demo:
    gr.Markdown("""
    # Parquet SQL Query and Plotting App

    **Query and visualize data** in `sample_contract_df.parquet`

    ## Instructions

    1. **Describe the data you want**: e.g., `Show awards over 1M in CA`
    2. **Generate SQL**: Click "Generate SQL" to see the SQL query.
    3. **Execute Query**: Run the query to view results and plots.
    4. **Dataset Schema**: See available columns and types in the "Schema" tab.
    """)

    with gr.Tabs():
        with gr.TabItem("Query Data"):
            with gr.Row():
                with gr.Column(scale=1):
                    query = gr.Textbox(label="Natural Language Query", placeholder='e.g., "Awards > 1M in CA"')
                    btn_generate = gr.Button("Generate SQL")
                    sql_out = gr.Code(label="Generated SQL Query", language="sql")
                    plot_code_out = gr.Code(label="Generated Plot Code", language="python")
                    btn_execute = gr.Button("Execute Query")
                    error_out = gr.Markdown("", visible=False)
                with gr.Column(scale=2):
                    results_out = gr.Dataframe(label="Query Results", interactive=False)
                    plot_out = gr.Plot(label="Plot")

        with gr.TabItem("Dataset Schema"):
            gr.Markdown("### Dataset Schema")
            schema_display = gr.JSON(label="Schema", value=json.loads(json.dumps(get_schema(), indent=2)))

    # =========================
    # Click Event Handlers
    # =========================

    async def on_generate_click(nl_query):
        """
        Handles the "Generate SQL" button click event.
        """
        sql_query, plot_code = await generate_sql_and_plot_code(nl_query)
        return sql_query, plot_code

    def on_execute_click(sql_query, plot_code):
        """
        Handles the "Execute Query" button click event.
        """
        result_df, error_msg = execute_query(sql_query)
        if error_msg:
            return None, None, error_msg
        if plot_code.strip():
            fig, plot_error = generate_plot(plot_code, result_df)
            if plot_error:
                return result_df, None, plot_error
            else:
                return result_df, fig, ""
        else:
            return result_df, None, ""

    btn_generate.click(fn=on_generate_click, inputs=query, outputs=[sql_out, plot_code_out])
    btn_execute.click(fn=on_execute_click, inputs=[sql_out, plot_code_out], outputs=[results_out, plot_out, error_out])

# =========================
# Launch the Gradio App
# =========================

demo.launch()