/**
 * Get cookie from request.
 *
 * @param  {Object} req
 * @param  {String} key
 * @return {String|undefined}
 */
export function cookieFromRequest (req, key) {
  if (!req.headers.cookie) {
    return
  }

  const cookie = req.headers.cookie.split(';').find(
    c => c.trim().startsWith(`${key}=`)
  )

  if (cookie) {
    return cookie.split('=')[1]
  }
}

/**
 * https://router.vuejs.org/en/advanced/scroll-behavior.html
 */
export function scrollBehavior (to, from, savedPosition) {
  if (savedPosition) {
    return savedPosition
  }

  let position = {}

  if (to.matched.length < 2) {
    position = { x: 0, y: 0 }
  } else if (to.matched.some(r => r.components.default.options.scrollToTop)) {
    position = { x: 0, y: 0 }
  } if (to.hash) {
    position = { selector: to.hash }
  }

  return position
}

/**
 * Deep copy the given object.
 *
 * @param  {Object} obj
 * @return {Object}
 */
export function deepCopy (obj) {
  if (obj === null || typeof obj !== 'object') {
    return obj
  }

  const copy = Array.isArray(obj) ? [] : {}

  Object.keys(obj).forEach((key) => {
    copy[key] = deepCopy(obj[key])
  })

  return copy
}

/**
 * If the given value is not an array, wrap it in one.
 *
 * @param  {Any} value
 * @return {Array}
 */
export function arrayWrap (value) {
  return Array.isArray(value) ? value : [value]
}

export function passwordChecker () {
  return {
    strong: new RegExp('^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#$%^&*])(?=.{8,})'),
    medium: new RegExp('^(((?=.*[a-z])(?=.*[A-Z]))|((?=.*[a-z])(?=.*[0-9]))|((?=.*[A-Z])(?=.*[0-9])))(?=.{6,})')
  }
}

export function formatDateISO8601 (date) {
  if (Object.prototype.toString.call(date) === '[object Date]') {
    return date.getFullYear() + '-' + (date.getMonth() + 1) + '-' + date.getDate()
  }
  return null
}

export function formatDate (date) {
  if (Object.prototype.toString.call(date) === '[object Date]') {
    return date.getDate() + '/' + (date.getMonth() + 1) + '/' + date.getFullYear()
  }
  return null
}

export function localeArray2Assoc (arr, keyArg = 'value', valueArg = 'text') {
  const ret = []
  if (arr) {
    for (const key in arr) {
      ret.push({
        [keyArg]: key,
        [valueArg]: arr[key]
      })
    }
  }
  return ret
}

export function debounce (fn, time) {
  let timeout

  return function () {
    const functionCall = () => fn.apply(this, arguments)

    clearTimeout(timeout)
    timeout = setTimeout(functionCall, time)
  }
}

export function getAge (birthDate) {
  const ageDifMs = Date.now() - new Date(birthDate).getTime()
  const ageDate = new Date(ageDifMs) // milliseconds from epoch
  return Math.abs(ageDate.getUTCFullYear() - 1970)
}