import { stringToBytes } from 'viem'
import { WrappedLabelTooLargeError } from '../errors/utils.js'
import type { AnyDate } from '../types.js'
import { ParentFuses } from './fuses.js'

export const MAX_EXPIRY = 2n ** 64n - 1n

export const expiryToBigInt = (expiry?: AnyDate, defaultValue = 0n): bigint => {
  if (!expiry) return defaultValue
  if (typeof expiry === 'bigint') return expiry
  if (typeof expiry === 'string' || typeof expiry === 'number')
    return BigInt(expiry)
  if (expiry instanceof Date) return BigInt(Math.floor(expiry.getTime() / 1000))
  throw new TypeError('Expiry must be a bigint, string, number or Date')
}

export const wrappedLabelLengthCheck = (label: string) => {
  const bytes = stringToBytes(label)
  if (bytes.byteLength > 255)
    throw new WrappedLabelTooLargeError({ label, byteLength: bytes.byteLength })
}

export const makeDefaultExpiry = (fuses?: number): bigint => {
  if (fuses && BigInt(fuses) & ParentFuses.PARENT_CANNOT_CONTROL)
    return MAX_EXPIRY
  return 0n
}