import qs from 'qs'

export function buildQueryString(input: Record<string, string>): string {
  return qs.stringify(input)
}

export function getQueryParams(
  url: string,
): { errorCode: string | null; params: { [key: string]: string } } {
  const parts = url.split('#')
  const hash = parts[1]
  const partsWithoutHash = parts[0].split('?')
  const queryString = partsWithoutHash[partsWithoutHash.length - 1]

  // Get query string (?hello=world)
  const parsedSearch = qs.parse(queryString, { parseArrays: false })

  // Pull errorCode off of params
  const errorCode = (parsedSearch.errorCode ?? null) as string | null
  delete parsedSearch.errorCode

  // Get hash (#abc=example)
  let parsedHash = {}
  if (parts[1]) {
    parsedHash = qs.parse(hash)
  }

  // Merge search and hash
  const params = {
    ...parsedSearch,
    ...parsedHash,
  }

  return {
    errorCode,
    params,
  }
}