import ccxt


class CcxtRag:
    def __init__(self, exchange_name: str = "kraken"):
        """
        Initializes the CCXT crypto exchange RAG.
        Defaults to 'kraken' as per finance_langgraph_app.py.
        """
        try:
            exchange_class = getattr(ccxt, exchange_name)
            self.exchange = exchange_class()
        except AttributeError:
            raise ValueError(f"Exchange {exchange_name} is not supported by ccxt.")

    def get_crypto_details(self, symbol: str) -> dict:
        """
        Retrieves crypto ticker details from the exchange.
        Automatically appends '/USDT' base pair if not specified.
        """
        symbol_upper = symbol.upper()
        if "/" not in symbol_upper:
            symbol_upper += "/USDT"

        try:
            ticker = self.exchange.fetch_ticker(symbol_upper)
            return ticker
        except Exception as e:
            return {"error": f"Could not retrieve details for {symbol}: {e}"}