import BaseError from 'baseerr'

export type QueryParamsType = Record<string, string | string[]>

export class QueryStringifyError extends BaseError<{}> {}

export default function queryToString(query: QueryParamsType): string {
  try {
    const params: URLSearchParams = Object.keys(query).reduce((params, key) => {
      const val: string | string[] = query[key]
      if (typeof val === 'string') {
        params.set(key, val)
        return params
      }
      const valCopy = val.slice()
      const first = valCopy.shift()
      if (first) {
        params.set(key, first)
        valCopy.forEach((val) => params.append(key, val))
      }
      return params
    }, new URLSearchParams())
    return params.toString()
  } catch (err) {
    throw QueryStringifyError.wrap(err, 'cannot stringify query', { query })
  }
}