from __future__ import annotations

from typing import Optional

import httpx

GOLDPRICE_URL_TEMPLATE = "https://data-asg.goldprice.org/dbXRates/{currency}"
DEFAULT_CURRENCY = "USD"
HEADERS = {
    "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0 Safari/537.36",
    "Accept": "application/json",
}


async def fetch_goldprice_quote(currency: str = DEFAULT_CURRENCY) -> Optional[dict]:
    url = GOLDPRICE_URL_TEMPLATE.format(currency=currency.upper())
    async with httpx.AsyncClient(timeout=10.0, headers=HEADERS) as client:
        response = await client.get(url)
        response.raise_for_status()
        data = response.json()

    items = data.get("items") or []
    if not items:
        return None

    quote = items[0]
    xau_price = quote.get("xauPrice")
    if xau_price is None:
        return None

    return {
        "price": float(xau_price),
        "change": float(quote.get("chgXau") or 0.0),
        "change_percent": float(quote.get("pcXau") or 0.0),
        "previous_close": float(quote.get("xauClose") or 0.0),
        "timestamp_ms": int(data.get("ts") or 0),
    }