import { displayed } from "./displayed";
import { livedataSource } from "./livedata";
import type { MarketSnapshot, MarketSource } from "./types";

/** Swap this line to change where the figures come from. */
const source: MarketSource = livedataSource;

/**
 * Never throws. Nothing selected, or an unreachable upstream, returns null and
 * the caller renders nothing — a build must not depend on a third party being
 * up, and a visitor should never see a broken widget.
 */
export async function getMarketSnapshot(): Promise<MarketSnapshot | null> {
  try {
    return await source.fetchSnapshot(displayed);
  } catch (error) {
    console.error("[market] snapshot unavailable:", (error as Error).message);
    return null;
  }
}

export { instruments, type InstrumentId } from "./instruments";
export * from "./types";