from __future__ import annotations

from app.config import Settings
from app.market.base import MarketData
from app.market.binance import BinanceMarketData
from app.market.coinbase import CoinbaseMarketData
from app.market.fake import FakeMarketData
from app.market.kraken import KrakenMarketData

_FEEDS: dict[str, type[MarketData]] = {
    "binance": BinanceMarketData,
    "binanceus": BinanceMarketData,
    "kraken": KrakenMarketData,
    "coinbase": CoinbaseMarketData,
}


def build_market_data(settings: Settings) -> MarketData:
    try:
        feed_cls = _FEEDS[settings.exchange.lower()]
    except KeyError:
        raise ValueError(
            f"unsupported exchange: {settings.exchange}. available: {sorted(_FEEDS)}"
        ) from None
    return feed_cls()


__all__ = [
    "FakeMarketData",
    "MarketData",
    "build_market_data",
]