app.py

import gradio as gr
from pathlib import Path
import os
import yfinance as yf

def get_stock_price(symbol: str) -> float:
    """
    Retrieve the current stock price for the given ticker symbol.
    Returns the latest closing price as a float.
    """
    try:
        ticker = yf.Ticker(symbol)
        # Get today's historical data; may return empty if market is closed or symbol is invalid.
        data = ticker.history(period="1d")
        if not data.empty:
            # Use the last closing price from today's data
            price = data['Close'].iloc[-1]
            return float(price)
        else:
            # As a fallback, try using the regular market price from the ticker info
            info = ticker.info
            price = info.get("regularMarketPrice", None)
            if price is not None:
                return float(price)
            else:
                return -1.0  # Indicate failure
    except Exception:
        # Return -1.0 to indicate an error occurred when fetching the stock price
        return -1.0


def get_stock_history(symbol: str, period: str = "1mo") -> str:
    """
    Retrieve historical data for a stock given a ticker symbol and a period.
    Returns the historical data as a CSV formatted string.
    
    Parameters:
        symbol: The stock ticker symbol.
        period: The period over which to retrieve historical data (e.g., '1mo', '3mo', '1y').
    """
    try:
        ticker = yf.Ticker(symbol)
        data = ticker.history(period=period)
        if data.empty:
            return f"No historical data found for symbol '{symbol}' with period '{period}'."
        # Convert the DataFrame to a CSV formatted string
        csv_data = data.to_csv()
        return csv_data
    except Exception as e:
        return f"Error fetching historical data: {str(e)}"


def compare_stocks(symbol1: str, symbol2: str) -> str:
    """
    Compare the current stock prices of two ticker symbols.
    Returns a formatted message comparing the two stock prices.
    
    Parameters:
        symbol1: The first stock ticker symbol.
        symbol2: The second stock ticker symbol.
    """
    price1 = get_stock_price(symbol1)
    price2 = get_stock_price(symbol2)
    if price1 < 0 or price2 < 0:
        return f"Error: Could not retrieve data for comparison of '{symbol1}' and '{symbol2}'."
    if price1 > price2:
        result = f"{symbol1} (${price1:.2f}) is higher than {symbol2} (${price2:.2f})."
    elif price1 < price2:
        result = f"{symbol1} (${price1:.2f}) is lower than {symbol2} (${price2:.2f})."
    else:
        result = f"Both {symbol1} and {symbol2} have the same price (${price1:.2f})."
    return result
    

demo = gr.TabbedInterface(
    [
        gr.Interface(get_stock_price, gr.Textbox(), gr.Textbox(), api_name="get_stock_price"),
        gr.Interface(fn=get_stock_history, inputs=[gr.Textbox(), gr.Textbox()], outputs=[gr.Textbox()], api_name="get_stock_history"),
        gr.Interface(fn=compare_stocks, inputs=[gr.Textbox(), gr.Textbox()], outputs=[gr.Textbox()], api_name="compare_stocks"),        
    ],
    [
        "Stock Price",
        "Stock History",
        "compare_stocks"
    ]
)

if __name__ == "__main__":
    demo.launch(mcp_server=True)