import JSBI from 'jsbi';

export const ZERO = JSBI.BigInt(0);
export const ONE = JSBI.BigInt(1);
export const TWO = JSBI.BigInt(2);
export const TEN = JSBI.BigInt(10);
const TWENTY_FOUR = JSBI.BigInt(24);
const SIXTY = JSBI.BigInt(60);
export const THOUSAND = JSBI.BigInt(1e3);
export const MILLION = JSBI.BigInt(1e6);
export const BILLION = JSBI.BigInt(1e9);
const HOUR_SECONDS = 3600;
export const HOUR_NANOS = JSBI.multiply(JSBI.BigInt(HOUR_SECONDS), BILLION);
export const MINUTE_NANOS_JSBI = JSBI.multiply(SIXTY, BILLION);
export const DAY_NANOS_JSBI = JSBI.multiply(HOUR_NANOS, TWENTY_FOUR);

/** Handle a JSBI or native BigInt. For user input, use ES.ToBigInt instead */
export function ensureJSBI(value: JSBI | bigint) {
  return typeof value === 'bigint' ? JSBI.BigInt(value.toString(10)) : value;
}

export function isEven(value: JSBI): boolean {
  return JSBI.equal(JSBI.remainder(value, TWO), ZERO);
}

export function abs(x: JSBI): JSBI {
  if (JSBI.lessThan(x, ZERO)) return JSBI.unaryMinus(x);
  return x;
}

export function compare(x: JSBI, y: JSBI): -1 | 0 | 1 {
  return JSBI.lessThan(x, y) ? -1 : JSBI.greaterThan(x, y) ? 1 : 0;
}

export function divmod(x: JSBI, y: JSBI): { quotient: JSBI; remainder: JSBI } {
  const quotient = JSBI.divide(x, y);
  const remainder = JSBI.remainder(x, y);
  return { quotient, remainder };
}