import type {
  FLuentUrlPlainObject,
  ParseUrlArgs,
  PlainObjectConstraint,
  StringifyUrlArgs,
} from '@/shared/types'

const URLTypesObj = {
  absolute: 'absolute',
  relative: 'relative',
  protocolRelative: 'protocol-relative',
} as const

type URLTypes = (typeof URLTypesObj)[keyof typeof URLTypesObj]

const defaultProtocol = 'https'
const defaultHost = 'example.com'

export function parseUrl<T extends PlainObjectConstraint>({
  str,
  parseQuery,
  parseQueryOptions,
}: ParseUrlArgs<T>): FLuentUrlPlainObject {
  const urlString = str.trim()

  const urlType: URLTypes = urlString.startsWith('//')
    ? URLTypesObj.protocolRelative
    : urlString.startsWith('/')
      ? URLTypesObj.relative
      : URLTypesObj.absolute

  let newUrlString = urlString

  if (urlType === URLTypesObj.protocolRelative) {
    newUrlString = `${defaultProtocol}:${newUrlString}`
  }

  if (urlType === URLTypesObj.relative) {
    newUrlString = `${defaultProtocol}://${defaultHost}${newUrlString}`
  }

  let url: URL

  try {
    url = new URL(newUrlString)
  } catch {
    throw new Error('Invalid URL')
  }

  const urlPlainObject: FLuentUrlPlainObject = {
    paths: [],
    queries: {},
  }

  if (urlType === URLTypesObj.absolute) {
    urlPlainObject.protocol =
      url.protocol !== '' ? url.protocol.replace(':', '') : undefined
  }

  if (
    urlType === URLTypesObj.absolute ||
    urlType === URLTypesObj.protocolRelative
  ) {
    urlPlainObject.hostname = url.hostname || undefined
  }

  urlPlainObject.paths =
    url.pathname === '/' ? [] : url.pathname.split('/').filter((p) => p !== '')

  urlPlainObject.port = url.port !== '' ? Number(url.port) : undefined

  urlPlainObject.fragment =
    url.hash !== '' ? url.hash.replace('#', '') : undefined

  urlPlainObject.queries =
    url.search !== ''
      ? parseQuery(url.search, parseQueryOptions)
      : Object.create(null)

  return urlPlainObject
}

export function stringifyUrl<T extends PlainObjectConstraint>(
  _args: StringifyUrlArgs<T>,
): string {
  throw new Error('Not implemented')
}