/*
  generateQueryString

  Returns a kebab-case js hook.

  generateQueryString('fooBar')
  '.js-foo-bar'
*/

const generateQueryString = (string, prefix = 'js') =>
  `.${prefix}-${string.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase()}`

/*
  qs / qsa

  Returns a query selector using the
  generateQueryString function

  qs('fooBar')
  document.querySelector('.js-foo-bar')
*/

const qs = (string, prefix = 'js') =>
  document.querySelector(generateQueryString(string, prefix))

// Same applies, except uses querySelectorAll

const qsa = (string, prefix = 'js') =>
  document.querySelectorAll(generateQueryString(string, prefix))

/*
  qsObj / qsaObj

  Returns an object containing
  query selectors based on provided
  array of strings

  qsObj(['foo', 'bar', 'fooBar'])
  {
    foo: document.querySelector('.js-foo'),
    bar: document.querySelector('.js-bar'),
    fooBar: document.querySelector('.js-foo-bar')
  }
*/

const qsObj = (array, prefix = 'js') => {
  let object = {}
  array.forEach(i => {
    object[i] = document.querySelector(generateQueryString(i, prefix))
  })
  return object
}

// Same applies, except uses querySelectorAll

const qsaObj = (array, prefix = 'js') => {
  let object = {}
  array.forEach(i => {
    object[i] = document.querySelectorAll(generateQueryString(i, prefix))
  })
  return object
}

/*
  manipulateQsObj / manipulateQsaObj

  Runs passed function to every element
  supplied in object.
*/

const manipulateQsObj = (object, cb) => {
  Object.keys(object).map(key => {
    cb(object[key])
  })
}

// Same applies, except uses querySelectorAll

const manipulateQsaObj = (object, cb) => {
  Object.keys(object).map(key => {
    all(object[key], el => cb(el))
  })
}

/*
  first

  Returns first node in list
*/

const first = hook => hook[0]

/*
  last

  Returns last node in list
*/

const last = hook => hook[hook.length - 1]

/*
  all

  Runs passed function to every
  node in list
*/

const all = (hook, cb) => {
  ;[].forEach.call(hook, el => cb(el))
}

export {
  qs,
  qsa,
  qsObj,
  qsaObj,
  manipulateQsObj,
  manipulateQsaObj,
  first,
  last,
  all
}