# rstat_tool/fetcher.py
# A dedicated, isolated script for fetching financial data.

import sys
import json
import yfinance as yf
import pandas as pd
import logging

# Suppress verbose yfinance logging in this isolated process
logging.getLogger("yfinance").setLevel(logging.CRITICAL)

def get_financial_data_isolated(ticker_symbol):
    """
    Fetches market cap and the most recent closing price for a ticker.
    This is the robust version of the function.
    """
    market_cap = None
    closing_price = None
    try:
        data = yf.download(
            ticker_symbol, period="2d", progress=False, auto_adjust=False
        )
        if not data.empty:
            last_close_raw = data['Close'].iloc[-1]
            if pd.notna(last_close_raw):
                closing_price = float(last_close_raw)
        try:
            market_cap = yf.Ticker(ticker_symbol).info.get('marketCap')
        except Exception:
            # This is a non-critical failure, we can proceed without market cap
            pass
        return {"market_cap": market_cap, "closing_price": closing_price}
    except Exception:
        # This is a critical failure, return None for both
        return {"market_cap": None, "closing_price": None}

if __name__ == "__main__":
    if len(sys.argv) < 2:
        # This script requires a ticker symbol as an argument
        sys.exit(1)
    
    ticker_to_fetch = sys.argv[1]
    result = get_financial_data_isolated(ticker_to_fetch)
    # Print the result as a JSON string to standard output
    print(json.dumps(result))