import { Token, CurrencyAmount, Percent } from "@uniswap/sdk-core";
import JSBI from "jsbi";
import { ONE_HUNDRED_PERCENT } from "../constants/misc";

export function computeFiatValuePriceImpact(
  fiatValueInput: CurrencyAmount<Token> | undefined | null,
  fiatValueOutput: CurrencyAmount<Token> | undefined | null
): Percent | undefined {
  if (!fiatValueOutput || !fiatValueInput) return undefined;
  if (!fiatValueInput.currency.equals(fiatValueOutput.currency))
    return undefined;
  if (JSBI.equal(fiatValueInput.quotient, JSBI.BigInt(0))) return undefined;
  const pct = ONE_HUNDRED_PERCENT.subtract(
    fiatValueOutput.divide(fiatValueInput)
  );
  return new Percent(pct.numerator, pct.denominator);
}