text: var compareDesc = require('../compare_desc/index.js')
  var parse = require('../parse/index.js')
  var differenceInSeconds = require('../difference_in_seconds/index.js')
  var differenceInMonths = require('../difference_in_months/index.js')
  var enLocale = require('../locale/en/index.js')
  
  var MINUTES_IN_DAY = 1440
  var MINUTES_IN_ALMOST_TWO_DAYS = 2520
  var MINUTES_IN_MONTH = 43200
  var MINUTES_IN_TWO_MONTHS = 86400
  
  /**
   * @category Common Helpers
   * @summary Return the distance between the given dates in words.
   *
   * @description
   * Return the distance between the given dates in words.
   *
   * | Distance between dates                                            | Result              |
   * |-------------------------------------------------------------------|---------------------|
   * | 0 ... 30 secs                                                     | less than a minute  |
   * | 30 secs ... 1 min 30 secs                                         | 1 minute            |
   * | 1 min 30 secs ... 44 mins 30 secs                                 | [2..44] minutes     |
   * | 44 mins ... 30 secs ... 89 mins 30 secs                           | about 1 hour        |
   * | 89 mins 30 secs ... 23 hrs 59 mins 30 secs                        | about [2..24] hours |
   * | 23 hrs 59 mins 30 secs ... 41 hrs 59 mins 30 secs                 | 1 day               |
   * | 41 hrs 59 mins 30 secs ... 29 days 23 hrs 59 mins 30 secs         | [2..30] days        |
   * | 29 days 23 hrs 59 mins 30 secs ... 44 days 23 hrs 59 mins 30 secs | about 1 month       |
   * | 44 days 23 hrs 59 mins 30 secs ... 59 days 23 hrs 59 mins 30 secs | about 2 months      |
   * | 59 days 23 hrs 59 mins 30 secs ... 1 yr                           | [2..12] months      |
   * | 1 yr ... 1 yr 3 months                                            | about 1 year        |
   * | 1 yr 3 months ... 1 yr 9 month s                                  | over 1 year         |
   * | 1 yr 9 months ... 2 yrs                                           | almost 2 years      |
   * | N yrs ... N yrs 3 months                                          | about N years       |
   * | N yrs 3 months ... N yrs 9 months                                 | over N years        |
   * | N yrs 9 months ... N+1 yrs                                        | almost N+1 years    |
   *
   * With `options.includeSeconds == true`:
   * | Distance between dates | Result               |
   * |------------------------|----------------------|
   * | 0 secs ... 5 secs      | less than 5 seconds  |
   * | 5 secs ... 10 secs     | less than 10 seconds |
   * | 10 secs ... 20 secs    | less than 20 seconds |
   * | 20 secs ... 40 secs    | half a minute        |
   * | 40 secs ... 60 secs    | less than a minute   |
   * | 60 secs ... 90 secs    | 1 minute             |
   *
   * @param {Date|String|Number} dateToCompare - the date to compare with
   * @param {Date|String|Number} date - the other date
   * @param {Object} [options] - the object with options
   * @param {Boolean} [options.includeSeconds=false] - distances less than a minute are more detailed
   * @param {Boolean} [options.addSuffix=false] - result indicates if the second date is earlier or later than the first
   * @param {Object} [options.locale=enLocale] - the locale object
   * @returns {String} the distance in words
   *
   * @example
   * // What is the distance between 2 July 2014 and 1 January 2015?
   * var result = distanceInWords(
   *   new Date(2014, 6, 2),
   *   new Date(2015, 0, 1)
   * )
   * //=> '6 months'
   *
   * @example
   * // What is the distance between 1 January 2015 00:00:15
   * // and 1 January 2015 00:00:00, including seconds?
   * var result = distanceInWords(
   *   new Date(2015, 0, 1, 0, 0, 15),
   *   new Date(2015, 0, 1, 0, 0, 0),
   *   {includeSeconds: true}
   * )
   * //=> 'less than 20 seconds'
   *
   * @example
   * // What is the distance from 1 January 2016
   * // to 1 January 2015, with a suffix?
   * var result = distanceInWords(
   *   new Date(2016, 0, 1),
   *   new Date(2015, 0, 1),
   *   {addSuffix: true}
   * )
   * //=> 'about 1 year ago'
   *
   * @example
   * // What is the distance between 1 August 2016 and 1 January 2015 in Esperanto?
   * var eoLocale = require('date-fns/locale/eo')
   * var result = distanceInWords(
   *   new Date(2016, 7, 1),
   *   new Date(2015, 0, 1),
   *   {locale: eoLocale}
   * )
   * //=> 'pli ol 1 jaro'
   */
  function distanceInWords (dirtyDateToCompare, dirtyDate, dirtyOptions) {
    var options = dirtyOptions || {}
  
    var comparison = compareDesc(dirtyDateToCompare, dirtyDate)
  
    var locale = options.locale
    var localize = enLocale.distanceInWords.localize
    if (locale && locale.distanceInWords && locale.distanceInWords.localize) {
      localize = locale.distanceInWords.localize
    }
  
    var localizeOptions = {
      addSuffix: Boolean(options.addSuffix),
      comparison: comparison
    }
  
    var dateLeft, dateRight
    if (comparison > 0) {
      dateLeft = parse(dirtyDateToCompare)
      dateRight = parse(dirtyDate)
    } else {
      dateLeft = parse(dirtyDate)
      dateRight = parse(dirtyDateToCompare)
    }
  
    var seconds = differenceInSeconds(dateRight, dateLeft)
    var offset = dateRight.getTimezoneOffset() - dateLeft.getTimezoneOffset()
    var minutes = Math.round(seconds / 60) - offset
    var months
  
    // 0 up to 2 mins
    if (minutes < 2) {
      if (options.includeSeconds) {
        if (seconds < 5) {
          return localize('lessThanXSeconds', 5, localizeOptions)
        } else if (seconds < 10) {
          return localize('lessThanXSeconds', 10, localizeOptions)
        } else if (seconds < 20) {
          return localize('lessThanXSeconds', 20, localizeOptions)
        } else if (seconds < 40) {
          return localize('halfAMinute', null, localizeOptions)
        } else if (seconds < 60) {
          return localize('lessThanXMinutes', 1, localizeOptions)
        } else {
          return localize('xMinutes', 1, localizeOptions)
        }
      } else {
        if (minutes === 0) {
          return localize('lessThanXMinutes', 1, localizeOptions)
        } else {
          return localize('xMinutes', minutes, localizeOptions)
        }
      }
  
    // 2 mins up to 0.75 hrs
    } else if (minutes < 45) {
      return localize('xMinutes', minutes, localizeOptions)
  
    // 0.75 hrs up to 1.5 hrs
    } else if (minutes < 90) {
      return localize('aboutXHours', 1, localizeOptions)
  
    // 1.5 hrs up to 24 hrs
    } else if (minutes < MINUTES_IN_DAY) {
      var hours = Math.round(minutes / 60)
      return localize('aboutXHours', hours, localizeOptions)
  
    // 1 day up to 1.75 days
    } else if (minutes < MINUTES_IN_ALMOST_TWO_DAYS) {
      return localize('xDays', 1, localizeOptions)
  
    // 1.75 days up to 30 days
    } else if (minutes < MINUTES_IN_MONTH) {
      var days = Math.round(minutes / MINUTES_IN_DAY)
      return localize('xDays', days, localizeOptions)
  
    // 1 month up to 2 months
    } else if (minutes < MINUTES_IN_TWO_MONTHS) {
      months = Math.round(minutes / MINUTES_IN_MONTH)
      return localize('aboutXMonths', months, localizeOptions)
    }
  
    months = differenceInMonths(dateRight, dateLeft)
  
    // 2 months up to 12 months
    if (months < 12) {
      var nearestMonth = Math.round(minutes / MINUTES_IN_MONTH)
      return localize('xMonths', nearestMonth, localizeOptions)
  
    // 1 year up to max Date
    } else {
      var monthsSinceStartOfYear = months % 12
      var years = Math.floor(months / 12)
  
      // N years up to 1 years 3 months
      if (monthsSinceStartOfYear < 3) {
        return localize('aboutXYears', years, localizeOptions)
  
      // N years 3 months up to N years 9 months
      } else if (monthsSinceStartOfYear < 9) {
        return localize('overXYears', years, localizeOptions)
  
      // N years 9 months up to N year 12 months
      } else {
        return localize('almostXYears', years + 1, localizeOptions)
      }
    }
  }
  
  module.exports = distanceInWords
  