// useful links for describing the parts that make up a URL:
// - https://nodejs.org/api/url.html#url_url_strings_and_url_objects
// - https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#Examples
//
// node's url formatting algorithm (which acts pretty unexpectedly)
// - https://nodejs.org/api/url.html#url_url_format_urlobject

import _ from 'lodash'
import url from 'url'

// yup, protocol contains a: ':' colon
// at the end of it (-______________-)
const DEFAULT_PROTOCOL_PORTS = {
  'https:': '443',
  'http:': '80',
}

const DEFAULT_PORTS = _.values(DEFAULT_PROTOCOL_PORTS)

const portIsDefault = (port) => {
  return port && DEFAULT_PORTS.includes(port)
}

const parseClone = (urlObject) => {
  return url.parse(_.clone(urlObject))
}

export const parse = url.parse

export function stripProtocolAndDefaultPorts (urlToCheck) {
  // grab host which is 'hostname:port' only
  const { host, hostname, port } = url.parse(urlToCheck)

  // if we have a default port for 80 or 443
  // then just return the hostname
  if (portIsDefault(port)) {
    return hostname
  }

  // else return the host
  return host
}

export function removePort (urlObject) {
  const parsed = parseClone(urlObject)

  // set host to undefined else url.format(...) will ignore the port property
  // https://nodejs.org/api/url.html#url_url_format_urlobject
  delete parsed.host
  delete parsed.port

  return parsed
}

export function removeDefaultPort (urlToCheck) {
  let parsed = parseClone(urlToCheck)

  if (portIsDefault(parsed.port)) {
    parsed = removePort(parsed)
  }

  return parsed
}

export function addDefaultPort (urlToCheck) {
  const parsed = parseClone(urlToCheck)

  if (!parsed.port) {
    // unset host...
    // see above for reasoning
    delete parsed.host
    if (parsed.protocol) {
      parsed.port = DEFAULT_PROTOCOL_PORTS[parsed.protocol]
    } else {
      delete parsed.port
    }
  }

  return parsed
}

export function getPath (urlToCheck) {
  return url.parse(urlToCheck).path
}