harb/kraiken-lib/src/staking.ts

const SECONDS_IN_YEAR = 365 * 24 * 60 * 60;

export function calculateSnatchShortfall(
  outstandingStake: bigint,
  desiredStakeShares: bigint,
  stakeTotalSupply: bigint,
  capNumerator: bigint = 2n,
  capDenominator: bigint = 10n
): bigint {
  if (capDenominator === 0n) {
    throw new Error('capDenominator must be greater than zero');
  }

  const cap = (stakeTotalSupply * capNumerator) / capDenominator;
  const required = outstandingStake + desiredStakeShares;
  const delta = required - cap;
  return delta > 0n ? delta : 0n;
}

export function isPositionDelinquent(
  lastTaxTimestamp: number,
  taxRate: number,
  referenceTimestamp: number = Math.floor(Date.now() / 1000),
  secondsInYear: number = SECONDS_IN_YEAR
): boolean {
  const rate = Number(taxRate);
  if (rate <= 0) return false;

  const allowance = secondsInYear / rate;
  return referenceTimestamp - lastTaxTimestamp > allowance;
}