import castSlice from './.internal/castSlice.js'
import charsEndIndex from './.internal/charsEndIndex.js'
import stringToArray from './.internal/stringToArray.js'

const methodName = ''.trimRight ? 'trimRight': 'trimEnd'

/**
 * Removes trailing whitespace or specified characters from `string`.
 *
 * @since 4.0.0
 * @category String
 * @param {string} [string=''] The string to trim.
 * @param {string} [chars=whitespace] The characters to trim.
 * @returns {string} Returns the trimmed string.
 * @see trim, trimStart
 * @example
 *
 * trimEnd('  abc  ')
 * // => '  abc'
 *
 * trimEnd('-_-abc-_-', '_-')
 * // => '-_-abc'
 */
function trimEnd(string, chars) {
  if (string && chars === undefined) {
    return string[methodName]()
  }
  if (!string || !chars) {
    return string
  }
  const strSymbols = stringToArray(string)
  const end = charsEndIndex(strSymbols, stringToArray(chars)) + 1
  return castSlice(strSymbols, 0, end).join('')
}

export default trimEnd