import { Currency, Token } from "@uniswap/sdk-core";
import { useMemo } from "react";
import { useUnsupportedTokens } from "./Tokens";

/**
 * Returns true if the input currency or output currency cannot be traded in the interface
 * @param currencyIn the input currency to check
 * @param currencyOut the output currency to check
 */
export function useIsSwapUnsupported(
  currencyIn?: Currency,
  currencyOut?: Currency
): boolean {
  const unsupportedTokens: {
    [address: string]: Token;
  } = useUnsupportedTokens();

  return useMemo(() => {
    // if unsupported list loaded & either token on list, mark as unsupported
    return Boolean(
      unsupportedTokens &&
        ((currencyIn?.isToken && unsupportedTokens[currencyIn.address]) ||
          (currencyOut?.isToken && unsupportedTokens[currencyOut.address]))
    );
  }, [currencyIn, currencyOut, unsupportedTokens]);
}