import requests

def get_live_rates_for_pair(pair="XAUUSD"):
    """
    Get live Bid and Ask prices for a specified forex pair.
    Returns dict with { "pair": ..., "bid": ..., "ask": ..., "difference": ... }
    """
    url = "https://research.titanfx.com/api/live-rate?group=forex"
    headers = {
        "referer": "https://research.titanfx.com/instruments/gbpusd",
        "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"Google Chrome\";v=\"138\"",
        "sec-ch-ua-mobile": "?0",
        "sec-ch-ua-platform": "\"Windows\"",
        "sec-fetch-dest": "empty",
        "sec-fetch-mode": "cors",
        "sec-fetch-site": "same-origin",
        "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36"
    }

    try:
        response = requests.get(url, headers=headers)
        response.raise_for_status()
        data = response.json()

        if pair not in data:
            return None

        pair_data = data[pair]
        # Format bid price
        bid_price = float(f"{pair_data[0]}.{pair_data[1]}")
        # Format ask price
        ask_price = float(f"{pair_data[2]}.{pair_data[3]}")
        # Calculate difference
        difference = ask_price - bid_price

        return {
            "pair": pair,
            "bid": bid_price,
            "ask": ask_price,
            "difference": difference
        }

    except Exception as e:
        print(f"Error while fetching price: {e}")
        return None