date-range-picker.js

/**
 * --------------------------------------------------------------------------
 * CoreUI PRO date-range-picker.js
 * License (https://coreui.io/pro/license/)
 * --------------------------------------------------------------------------
 */

import * as Popper from '@popperjs/core'
import BaseComponent from './base-component.js'
import Calendar from './calendar.js'
import TimePicker from './time-picker.js'
import EventHandler from './dom/event-handler.js'
import Manipulator from './dom/manipulator.js'
import SelectorEngine from './dom/selector-engine.js'
import { defineJQueryPlugin, getElement, isRTL } from './util/index.js'
import { convertToDateObject } from './util/calendar.js'
import { getLocalDateFromString } from './util/date-range-picker.js'

/**
 * Constants
 */

const NAME = 'date-range-picker'
const DATA_KEY = 'coreui.date-range-picker'
const EVENT_KEY = `.${DATA_KEY}`
const DATA_API_KEY = '.data-api'

const ENTER_KEY = 'Enter'
const ESCAPE_KEY = 'Escape'
const TAB_KEY = 'Tab'
const RIGHT_MOUSE_BUTTON = 2

const EVENT_CLICK = `click${EVENT_KEY}`
const EVENT_END_DATE_CHANGE = `endDateChange${EVENT_KEY}`
const EVENT_HIDE = `hide${EVENT_KEY}`
const EVENT_HIDDEN = `hidden${EVENT_KEY}`
const EVENT_INPUT = 'input'
const EVENT_KEYDOWN = `keydown${EVENT_KEY}`
const EVENT_RESIZE = 'resize'
const EVENT_SHOW = `show${EVENT_KEY}`
const EVENT_SHOWN = `shown${EVENT_KEY}`
const EVENT_SUBMIT = 'submit'
const EVENT_START_DATE_CHANGE = `startDateChange${EVENT_KEY}`
const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`
const EVENT_KEYUP_DATA_API = `keyup${EVENT_KEY}${DATA_API_KEY}`
const EVENT_LOAD_DATA_API = `load${EVENT_KEY}${DATA_API_KEY}`

const CLASS_NAME_BODY = 'date-picker-body'
const CLASS_NAME_CALENDAR = 'date-picker-calendar'
const CLASS_NAME_CALENDARS = 'date-picker-calendars'
const CLASS_NAME_CLEANER = 'date-picker-cleaner'
const CLASS_NAME_DATE_PICKER = 'date-picker'
const CLASS_NAME_DATE_RANGE_PICKER = 'date-range-picker'
const CLASS_NAME_DISABLED = 'disabled'
const CLASS_NAME_DROPDOWN = 'date-picker-dropdown'
const CLASS_NAME_INDICATOR = 'date-picker-indicator'
const CLASS_NAME_INPUT = 'date-picker-input'
const CLASS_NAME_INPUT_GROUP = 'date-picker-input-group'
const CLASS_NAME_IS_INVALID = 'is-invalid'
const CLASS_NAME_IS_VALID = 'is-valid'
const CLASS_NAME_FOOTER = 'date-picker-footer'
const CLASS_NAME_RANGES = 'date-picker-ranges'
const CLASS_NAME_SEPARATOR = 'date-picker-separator'
const CLASS_NAME_SHOW = 'show'
const CLASS_NAME_TIME_PICKER = 'time-picker'
const CLASS_NAME_TIME_PICKERS = 'date-picker-timepickers'
const CLASS_NAME_WAS_VALIDATED = 'was-validated'

const SELECTOR_CALENDAR = '.calendars'
const SELECTOR_DATA_TOGGLE = '[data-coreui-toggle="date-range-picker"]:not(.disabled):not(:disabled)'
const SELECTOR_DATA_TOGGLE_SHOWN = `${SELECTOR_DATA_TOGGLE}.${CLASS_NAME_SHOW}`
const SELECTOR_INPUT = '.date-picker-input'
const SELECTOR_WAS_VALIDATED = 'form.was-validated'

const Default = {
  ariaNavNextMonthLabel: 'Next month',
  ariaNavNextYearLabel: 'Next year',
  ariaNavPrevMonthLabel: 'Previous month',
  ariaNavPrevYearLabel: 'Previous year',
  calendarDate: null,
  calendars: 2,
  cancelButton: 'Cancel',
  cancelButtonClasses: ['btn', 'btn-sm', 'btn-ghost-primary'],
  confirmButton: 'OK',
  confirmButtonClasses: ['btn', 'btn-sm', 'btn-primary'],
  cleaner: true,
  container: false,
  date: null,
  disabled: false,
  disabledDates: null,
  endDate: null,
  endName: null,
  firstDayOfWeek: 1,
  footer: false,
  inputDateFormat: null,
  inputDateParse: null,
  inputReadOnly: false,
  invalid: false,
  indicator: true,
  locale: 'default',
  maxDate: null,
  minDate: null,
  name: null,
  placeholder: ['Start date', 'End date'],
  range: true,
  ranges: {},
  rangesButtonsClasses: ['btn', 'btn-ghost-secondary'],
  required: true,
  separator: true,
  size: null,
  startDate: null,
  startName: null,
  selectAdjacementDays: false,
  selectEndDate: false,
  selectionType: 'day',
  showAdjacementDays: true,
  showWeekNumber: false,
  timepicker: false,
  todayButton: 'Today',
  todayButtonClasses: ['btn', 'btn-sm', 'btn-primary', 'me-auto'],
  valid: false,
  weekdayFormat: 2,
  weekNumbersLabel: null
}

const DefaultType = {
  ariaNavNextMonthLabel: 'string',
  ariaNavNextYearLabel: 'string',
  ariaNavPrevMonthLabel: 'string',
  ariaNavPrevYearLabel: 'string',
  calendarDate: '(date|number|string|null)',
  calendars: 'number',
  cancelButton: '(boolean|string)',
  cancelButtonClasses: '(array|string)',
  cleaner: 'boolean',
  confirmButton: '(boolean|string)',
  confirmButtonClasses: '(array|string)',
  container: '(string|element|boolean)',
  date: '(date|number|string|null)',
  disabledDates: '(array|date|function|null)',
  disabled: 'boolean',
  endDate: '(date|number|string|null)',
  endName: '(string|null)',
  firstDayOfWeek: 'number',
  footer: 'boolean',
  indicator: 'boolean',
  inputDateFormat: '(function|null)',
  inputDateParse: '(function|null)',
  inputReadOnly: 'boolean',
  invalid: 'boolean',
  locale: 'string',
  maxDate: '(date|number|string|null)',
  minDate: '(date|number|string|null)',
  name: '(string|null)',
  placeholder: '(array|string)',
  range: 'boolean',
  ranges: 'object',
  rangesButtonsClasses: '(array|string)',
  required: 'boolean',
  separator: 'boolean',
  size: '(string|null)',
  startDate: '(date|number|string|null)',
  startName: '(string|null)',
  selectAdjacementDays: 'boolean',
  selectEndDate: 'boolean',
  selectionType: 'string',
  showAdjacementDays: 'boolean',
  showWeekNumber: 'boolean',
  timepicker: 'boolean',
  todayButton: '(boolean|string)',
  todayButtonClasses: '(array|string)',
  valid: 'boolean',
  weekdayFormat: '(number|string)',
  weekNumbersLabel: '(string|null)'
}

/**
 * Class definition
 */

class DateRangePicker extends BaseComponent {
  constructor(element, config) {
    super(element)

    this._config = this._getConfig(config)
    this._calendarDate = this._config.calendarDate
    this._startDate = this._config.date || this._config.startDate
    this._endDate = this._config.endDate
    this._initialStartDate = null
    this._initialEndDate = null
    this._mobile = window.innerWidth < 768
    this._popper = null
    this._selectEndDate = this._config.selectEndDate

    this._calendar = null
    this._calendars = null
    this._endInput = null
    this._indicatorElement = null
    this._menu = null
    this._startInput = null
    this._timepickers = null
    this._timePickerEnd = null
    this._timePickerStart = null
    this._togglerElement = null

    this._createDateRangePicker()
    this._createDateRangePickerCalendars()
    this._addEventListeners()
    this._addCalendarEventListeners()
  }

  // Getters
  static get Default() {
    return Default
  }

  static get DefaultType() {
    return DefaultType
  }

  static get NAME() {
    return NAME
  }

  // Public
  toggle() {
    return this._isShown() ? this.hide() : this.show()
  }

  show() {
    if (this._config.disabled || this._isShown()) {
      return
    }

    this._initialStartDate = new Date(this._startDate)
    this._initialEndDate = new Date(this._endDate)

    EventHandler.trigger(this._element, EVENT_SHOW)
    this._element.classList.add(CLASS_NAME_SHOW)
    this._element.setAttribute('aria-expanded', true)

    if (this._config.container) {
      this._menu.classList.add(CLASS_NAME_SHOW)
    }

    EventHandler.trigger(this._element, EVENT_SHOWN)

    this._createPopper()
  }

  hide() {
    EventHandler.trigger(this._element, EVENT_HIDE)

    if (this._popper) {
      this._popper.destroy()
    }

    this._element.classList.remove(CLASS_NAME_SHOW)
    this._element.setAttribute('aria-expanded', 'false')

    if (this._config.container) {
      this._menu.classList.remove(CLASS_NAME_SHOW)
    }

    EventHandler.trigger(this._element, EVENT_HIDDEN)
  }

  dispose() {
    if (this._popper) {
      this._popper.destroy()
    }

    super.dispose()
  }

  cancel() {
    this._changeStartDate(this._initialStartDate)

    if (this._config.range) {
      this._changeEndDate(this._initialEndDate)
    }

    this.hide()

    this._calendar.update(this._getCalendarConfig)
  }

  clear() {
    this._changeStartDate(null)
    this._changeEndDate(null)
    this._calendar.update(this._getCalendarConfig())
  }

  reset() {
    this._changeStartDate(this._config.startDate)
    this._changeEndDate(this._config.endDate)
    this._calendar.update(this._getCalendarConfig())
  }

  update(config) {
    this._config = this._getConfig(config)
    this._calendarDate = this._config.calendarDate
    this._startDate = this._config.date || this._config.startDate
    this._endDate = this._config.endDate
    this._selectEndDate = this._config.selectEndDate

    this._element.innerHTML = ''
    this._createDateRangePicker()
    this._createDateRangePickerCalendars()
    this._addEventListeners()
    this._addCalendarEventListeners()
  }

  // Private
  _addEventListeners() {
    EventHandler.on(this._indicatorElement, EVENT_CLICK, () => {
      if (!this._config.disabled) {
        this.toggle()
      }
    })

    EventHandler.on(this._indicatorElement, EVENT_KEYDOWN, event => {
      if (!this._config.disabled && event.key === ENTER_KEY) {
        this.toggle()
      }
    })

    EventHandler.on(this._togglerElement, EVENT_CLICK, event => {
      if (!this._config.disabled && event.target !== this._indicatorElement) {
        this.show()
      }
    })

    EventHandler.on(this._element, EVENT_KEYDOWN, event => {
      if (event.key === ESCAPE_KEY) {
        this.hide()
      }
    })

    EventHandler.on(this._startInput, EVENT_CLICK, () => {
      this._selectEndDate = false
      this._calendar.update(this._getCalendarConfig())
    })

    EventHandler.on(this._startInput, EVENT_INPUT, event => {
      const date = this._parseDate(event.target.value)

      // valid date or empty date
      if ((date instanceof Date && !Number.isNaN(date)) || (date === null)) {
        this._startDate = date
        this._calendarDate = date
        this._calendar.update(this._getCalendarConfig())

        EventHandler.trigger(this._element, EVENT_START_DATE_CHANGE, {
          date
        })
      }
    })

    EventHandler.on(this._startInput.form, EVENT_SUBMIT, () => {
      if (this._startInput.form.classList.contains(CLASS_NAME_WAS_VALIDATED)) {
        if (this._config.range && (Number.isNaN(Date.parse(this._startInput.value)) || Number.isNaN(Date.parse(this._endInput.value)))) {
          return this._element.classList.add(CLASS_NAME_IS_INVALID)
        }

        if (this._config.range && this._startDate instanceof Date && this._endDate instanceof Date) {
          return this._element.classList.add(CLASS_NAME_IS_VALID)
        }

        if (!this._config.range && Number.isNaN(Date.parse(this._startInput.value))) {
          return this._element.classList.add(CLASS_NAME_IS_INVALID)
        }

        if (!this._config.range && this._startDate instanceof Date) {
          return this._element.classList.add(CLASS_NAME_IS_VALID)
        }

        this._element.classList.add(CLASS_NAME_IS_INVALID)
      }
    })

    EventHandler.on(this._endInput, EVENT_CLICK, () => {
      this._selectEndDate = true
      this._calendar.update(this._getCalendarConfig())
    })

    EventHandler.on(this._endInput, EVENT_INPUT, event => {
      const date = this._parseDate(event.target.value)

      // valid date or empty date
      if ((date instanceof Date && !Number.isNaN(date)) || (date === null)) {
        this._endDate = date
        this._calendarDate = date
        this._calendar.update(this._getCalendarConfig())

        EventHandler.trigger(this._element, EVENT_END_DATE_CHANGE, {
          date
        })
      }
    })

    EventHandler.on(window, EVENT_RESIZE, () => {
      this._mobile = window.innerWidth < 768
    })
  }

  _addCalendarEventListeners() {
    for (const calendar of SelectorEngine.find(SELECTOR_CALENDAR, this._element)) {
      EventHandler.on(calendar, 'startDateChange.coreui.calendar', event => {
        this._changeStartDate(event.date)

        if (!this._config.range && (!this._config.footer && !this._config.timepicker)) {
          this.hide()
        }
      })

      EventHandler.on(calendar, 'endDateChange.coreui.calendar', event => {
        this._changeEndDate(event.date)

        if (this._startDate && (!this._config.footer && !this._config.timepicker)) {
          this.hide()
        }
      })

      EventHandler.on(calendar, 'cellHover.coreui.calendar', event => {
        if (this._selectEndDate) {
          this._endInput.value = event.date ? this._setInputValue(event.date) : this._setInputValue(this._endDate)
          return
        }

        this._startInput.value = event.date ? this._setInputValue(event.date) : this._setInputValue(this._startDate)
      })

      EventHandler.on(calendar, 'selectEndChange.coreui.calendar', event => {
        this._selectEndDate = event.value
      })
    }
  }

  _changeStartDate(value, skipTimePickerUpdate = false) {
    this._startDate = value
    this._startInput.value = this._setInputValue(value)
    this._startInput.dispatchEvent(new Event('change'))

    EventHandler.trigger(this._element, EVENT_START_DATE_CHANGE, {
      date: value
    })

    if (this._timePickerStart && !skipTimePickerUpdate) {
      this._timePickerStart.update(this._getTimePickerConfig(true))
    }
  }

  _changeEndDate(value, skipTimePickerUpdate = false) {
    this._endDate = value
    this._endInput.value = this._setInputValue(value)
    this._endInput.dispatchEvent(new Event('change'))

    EventHandler.trigger(this._element, EVENT_END_DATE_CHANGE, {
      date: value
    })

    if (this._timePickerEnd && !skipTimePickerUpdate) {
      this._timePickerEnd.update(this._getTimePickerConfig(false))
    }
  }

  _getCalendarConfig() {
    return {
      ariaNavNextMonthLabel: this._config.ariaNavNextMonthLabel,
      ariaNavNextYearLabel: this._config.ariaNavNextYearLabel,
      ariaNavPrevMonthLabel: this._config.ariaNavPrevMonthLabel,
      ariaNavPrevYearLabel: this._config.ariaNavPrevYearLabel,
      calendarDate: this._calendarDate,
      calendars: this._config.calendars,
      disabledDates: this._config.disabledDates,
      endDate: this._endDate,
      firstDayOfWeek: this._config.firstDayOfWeek,
      locale: this._config.locale,
      maxDate: this._config.maxDate,
      minDate: this._config.minDate,
      range: this._config.range,
      selectAdjacementDays: this._config.selectAdjacementDays,
      selectEndDate: this._selectEndDate,
      selectionType: this._config.selectionType,
      showAdjacementDays: this._config.showAdjacementDays,
      showWeekNumber: this._config.showWeekNumber,
      startDate: this._startDate,
      weekdayFormat: this._config.weekdayFormat,
      weekNumbersLabel: this._config.weekNumbersLabel
    }
  }

  _getTimePickerConfig(start) {
    return {
      disabled: start ? !this._startDate : !this._endDate,
      locale: this._config.locale,
      time: start ? this._startDate && new Date(this._startDate) : this._endDate && new Date(this._endDate),
      type: 'inline',
      variant: 'select'
    }
  }

  _createDateRangePicker() {
    this._element.classList.add(CLASS_NAME_DATE_PICKER)

    Manipulator.setDataAttribute(this._element, 'toggle', this._config.range ? CLASS_NAME_DATE_RANGE_PICKER : CLASS_NAME_DATE_PICKER)

    if (this._config.size) {
      this._element.classList.add(`date-picker-${this._config.size}`)
    }

    if (this._config.disabled) {
      this._element.classList.add(CLASS_NAME_DISABLED)
    }

    this._element.classList.toggle(CLASS_NAME_IS_INVALID, this._config.invalid)
    this._element.classList.toggle(CLASS_NAME_IS_VALID, this._config.valid)
    this._element.append(this._createDateRangePickerInputGroup())

    const dropdownEl = document.createElement('div')
    dropdownEl.classList.add(CLASS_NAME_DROPDOWN)

    dropdownEl.append(this._createDateRangePickerBody())
    if (this._config.footer || this._config.timepicker) {
      dropdownEl.append(this._createDateRangeFooter())
    }

    const { container } = this._config
    if (container) {
      container.append(dropdownEl)
    } else {
      this._element.append(dropdownEl)
    }

    this._menu = dropdownEl
  }

  _createDateRangePickerInputGroup() {
    const inputGroupEl = document.createElement('div')
    inputGroupEl.classList.add(CLASS_NAME_INPUT_GROUP)

    let startInputName = null

    if (this._config.name || this._config.startName || this._element.id) {
      startInputName = this._config.name || this._config.startName || (this._config.range ? `date-range-picker-start-date-${this._element.id}` : `date-picker-${this._element.id}`)
    }

    const startInputEl = this._createInput(startInputName, this._getPlaceholder()[0], this._setInputValue(this._startDate))

    let endInputName = null

    if (this._config.endName || this._element.id) {
      endInputName = this._config.endName || `date-range-picker-end-date-${this._element.id}`
    }

    const endInputEl = this._createInput(endInputName, this._getPlaceholder()[1], this._setInputValue(this._endDate))

    const inputGroupTextSeparatorEl = document.createElement('div')
    inputGroupTextSeparatorEl.classList.add(CLASS_NAME_SEPARATOR)

    this._startInput = startInputEl
    this._endInput = endInputEl

    inputGroupEl.append(startInputEl)

    if (this._config.separator) {
      inputGroupEl.append(inputGroupTextSeparatorEl)
    }

    if (this._config.range) {
      inputGroupEl.append(endInputEl)
    }

    if (this._config.indicator) {
      const inputGroupIndicatorEl = document.createElement('div')
      inputGroupIndicatorEl.classList.add(CLASS_NAME_INDICATOR)

      if (!this._config.disabled) {
        inputGroupIndicatorEl.tabIndex = 0
      }

      inputGroupEl.append(inputGroupIndicatorEl)

      this._indicatorElement = inputGroupIndicatorEl
    }

    if (this._config.cleaner) {
      const inputGroupCleanerEl = document.createElement('div')
      inputGroupCleanerEl.classList.add(CLASS_NAME_CLEANER)
      inputGroupCleanerEl.addEventListener('click', event => {
        event.stopPropagation()
        this.clear()
      })

      inputGroupEl.append(inputGroupCleanerEl)
    }

    this._togglerElement = inputGroupEl

    return inputGroupEl
  }

  _createDateRangePickerBody() {
    const dateRangePickerBodyEl = document.createElement('div')
    dateRangePickerBodyEl.classList.add(CLASS_NAME_BODY)

    if (Object.keys(this._config.ranges).length) {
      const dateRangePickerRangesEl = document.createElement('div')
      dateRangePickerRangesEl.classList.add(CLASS_NAME_RANGES)

      for (const key of Object.keys(this._config.ranges)) {
        const buttonEl = document.createElement('button')
        buttonEl.classList.add(...this._getButtonClasses(this._config.rangesButtonsClasses))
        buttonEl.role = 'button'
        buttonEl.addEventListener('click', () => {
          this._changeStartDate(this._config.ranges[key][0])
          this._changeEndDate(this._config.ranges[key][1])

          this._calendar.update(this._getCalendarConfig())
        })

        buttonEl.innerHTML = key
        dateRangePickerRangesEl.append(buttonEl)
      }

      dateRangePickerBodyEl.append(dateRangePickerRangesEl)
    }

    const calendarsEl = document.createElement('div')
    calendarsEl.classList.add(CLASS_NAME_CALENDARS)

    this._calendars = calendarsEl

    dateRangePickerBodyEl.append(calendarsEl)

    if (this._config.timepicker) {
      const timepickersEl = document.createElement('div')
      timepickersEl.classList.add(CLASS_NAME_TIME_PICKERS)

      this._timepickers = timepickersEl
      dateRangePickerBodyEl.append(timepickersEl)
    }

    return dateRangePickerBodyEl
  }

  _createDateRangePickerCalendars() {
    const calendarEl = document.createElement('div')
    calendarEl.classList.add(CLASS_NAME_CALENDAR)

    this._calendars.append(calendarEl)

    this._calendar = new Calendar(calendarEl, this._getCalendarConfig())

    EventHandler.on(calendarEl, 'calendarDateChange.coreui.calendar', event => {
      this._calendarDate = event.date
    })

    EventHandler.on(calendarEl, 'calendarMouseleave.coreui.calendar', () => {
      if (this._startDate) {
        this._startInput.value = this._setInputValue(this._startDate)
      }

      if (this._endDate) {
        this._endInput.value = this._setInputValue(this._endDate)
      }
    })

    if (this._config.timepicker) {
      if (this._mobile || (this._range && this._config.calendars === 1)) {
        const timePickerStartEl = document.createElement('div')
        timePickerStartEl.classList.add(CLASS_NAME_TIME_PICKER)
        this._timePickerStart = new TimePicker(timePickerStartEl, this._getTimePickerConfig(true))

        calendarEl.append(timePickerStartEl)

        EventHandler.on(timePickerStartEl, 'timeChange.coreui.time-picker', event => {
          this._changeStartDate(event.date, true)
          this._calendar.update(this._getCalendarConfig())
        })

        const timePickerEndEl = document.createElement('div')
        timePickerEndEl.classList.add(CLASS_NAME_TIME_PICKER)
        this._timePickerEnd = new TimePicker(timePickerEndEl, this._getTimePickerConfig(false))

        this._timepickers.append(timePickerEndEl)

        EventHandler.on(timePickerEndEl, 'timeChange.coreui.time-picker', event => {
          this._changeEndDate(event.date, true)
          this._calendar.update(this._getCalendarConfig())
        })
      } else {
        for (const [index, _] of Array.from({ length: this._config.calendars }).entries()) {
          const timePickerEl = document.createElement('div')
          timePickerEl.classList.add(CLASS_NAME_TIME_PICKER)

          const _timepicker = new TimePicker(timePickerEl, this._getTimePickerConfig(index === 0))

          if (index === 0) {
            this._timePickerStart = _timepicker
          } else {
            this._timePickerEnd = _timepicker
          }

          this._timepickers.append(timePickerEl)

          EventHandler.on(timePickerEl, 'timeChange.coreui.time-picker', event => {
            if (index === 0) {
              this._changeStartDate(event.date, true)
            } else {
              this._changeEndDate(event.date, true)
            }

            this._calendar.update(this._getCalendarConfig())
          })
        }
      }
    }
  }

  _createDateRangeFooter() {
    const footerEl = document.createElement('div')
    footerEl.classList.add(CLASS_NAME_FOOTER)

    if (this._config.todayButton) {
      const todayButtonEl = document.createElement('button')
      todayButtonEl.classList.add(...this._getButtonClasses(this._config.todayButtonClasses))
      todayButtonEl.type = 'button'
      todayButtonEl.innerHTML = this._config.todayButton
      todayButtonEl.addEventListener('click', () => {
        const date = new Date()
        this._calendarDate = date
        this._changeStartDate(date)

        if (this._config.range) {
          this._changeEndDate(date)
        }

        this._calendar.update(this._getCalendarConfig())
      })

      footerEl.append(todayButtonEl)
    }

    if (this._config.cancelButton) {
      const cancelButtonEl = document.createElement('button')
      cancelButtonEl.classList.add(...this._getButtonClasses(this._config.cancelButtonClasses))
      cancelButtonEl.type = 'button'
      cancelButtonEl.innerHTML = this._config.cancelButton
      cancelButtonEl.addEventListener('click', () => {
        this.cancel()
      })

      footerEl.append(cancelButtonEl)
    }

    if (this._config.confirmButton) {
      const confirmButtonEl = document.createElement('button')
      confirmButtonEl.classList.add(...this._getButtonClasses(this._config.confirmButtonClasses))
      confirmButtonEl.type = 'button'
      confirmButtonEl.innerHTML = this._config.confirmButton
      confirmButtonEl.addEventListener('click', () => {
        this.hide()
      })

      footerEl.append(confirmButtonEl)
    }

    return footerEl
  }

  _createInput(name, placeholder, value) {
    const inputEl = document.createElement('input')
    inputEl.classList.add(CLASS_NAME_INPUT)
    inputEl.autocomplete = 'off'
    inputEl.disabled = this._config.disabled
    inputEl.placeholder = placeholder
    inputEl.readOnly = this._config.inputReadOnly
    inputEl.required = this._config.required
    inputEl.type = 'text'
    inputEl.value = value

    if (name) {
      inputEl.name = name
    }

    const events = ['change', 'keyup', 'paste']

    for (const event of events) {
      inputEl.addEventListener(event, ({ target }) => {
        if (target.closest(SELECTOR_WAS_VALIDATED)) {
          const inputs = SelectorEngine.find(SELECTOR_INPUT, this._element)

          for (const input of inputs) {
            if (Number.isNaN(Date.parse(input.value))) {
              this._element.classList.add(CLASS_NAME_IS_INVALID)
              this._element.classList.remove(CLASS_NAME_IS_VALID)
              return
            }
          }

          if (this._config.range && this._startDate instanceof Date && this._endDate instanceof Date) {
            this._element.classList.add(CLASS_NAME_IS_VALID)
            this._element.classList.remove(CLASS_NAME_IS_INVALID)
            return
          }

          if (!this._config.range && this._startDate instanceof Date) {
            this._element.classList.add(CLASS_NAME_IS_VALID)
            this._element.classList.remove(CLASS_NAME_IS_INVALID)
            return
          }

          this._element.classList.add(CLASS_NAME_IS_INVALID)
          this._element.classList.remove(CLASS_NAME_IS_VALID)
        }
      })
    }

    return inputEl
  }

  _createPopper() {
    if (typeof Popper === 'undefined') {
      throw new TypeError('CoreUI\'s date picker require Popper (https://popper.js.org)')
    }

    const popperConfig = {
      modifiers: [{
        name: 'preventOverflow',
        options: {
          boundary: 'clippingParents'
        }
      },
      {
        name: 'offset',
        options: {
          offset: [0, 2]
        }
      }],
      placement: isRTL() ? 'bottom-end' : 'bottom-start'
    }

    this._popper = Popper.createPopper(this._togglerElement, this._menu, popperConfig)
  }

  _parseDate(str) {
    if (!str) {
      return null
    }

    return this._config.inputDateParse ?
      this._config.inputDateParse(str) :
      getLocalDateFromString(str, this._config.locale, this._config.timepicker)
  }

  _formatDate(date) {
    if (!date) {
      return ''
    }

    if (this._config.inputDateFormat) {
      return this._config.inputDateFormat(
        date instanceof Date ? new Date(date) : convertToDateObject(date, this._config.selectionType)
      )
    }

    if (this._config.selectionType !== 'day') {
      return date
    }

    const _date = new Date(date)

    return this._config.timepicker ? _date.toLocaleString(this._config.locale) : _date.toLocaleDateString(this._config.locale)
  }

  _getButtonClasses(classes) {
    if (typeof classes === 'string') {
      return classes.split(' ')
    }

    return classes
  }

  _getPlaceholder() {
    const { placeholder } = this._config

    if (typeof placeholder === 'string') {
      return placeholder.split(',')
    }

    return placeholder
  }

  _isShown() {
    return this._element.classList.contains(CLASS_NAME_SHOW)
  }

  _setInputValue(date) {
    if (date) {
      return this._formatDate(date)
    }

    return ''
  }

  _configAfterMerge(config) {
    if (config.container === true) {
      config.container = document.body
    }

    if (typeof config.container === 'object' || typeof config.container === 'string') {
      config.container = getElement(config.container)
    }

    return config
  }

  // Static
  static dateRangePickerInterface(element, config) {
    const data = DateRangePicker.getOrCreateInstance(element, config)

    if (typeof config === 'string') {
      if (typeof data[config] === 'undefined') {
        throw new TypeError(`No method named "${config}"`)
      }

      data[config]()
    }
  }

  static jQueryInterface(config) {
    return this.each(function () {
      const data = DateRangePicker.getOrCreateInstance(this, config)

      if (typeof config !== 'string') {
        return
      }

      if (data[config] === undefined || config.startsWith('_') || config === 'constructor') {
        throw new TypeError(`No method named "${config}"`)
      }

      data[config](this)
    })
  }

  static clearMenus(event) {
    if (event.button === RIGHT_MOUSE_BUTTON || (event.type === 'keyup' && event.key !== TAB_KEY)) {
      return
    }

    const openToggles = SelectorEngine.find(SELECTOR_DATA_TOGGLE_SHOWN)

    for (const toggle of openToggles) {
      const context = DateRangePicker.getInstance(toggle)

      if (!context) {
        continue
      }

      const composedPath = event.composedPath()

      if (
        composedPath.includes(context._element)
      ) {
        continue
      }

      const relatedTarget = { relatedTarget: context._element }

      if (event.type === 'click') {
        relatedTarget.clickEvent = event
      }

      context.hide()
    }
  }
}

/**
 * Data API implementation
 */

EventHandler.on(window, EVENT_LOAD_DATA_API, () => {
  const dateRangePickers = SelectorEngine.find(SELECTOR_DATA_TOGGLE)
  for (let i = 0, len = dateRangePickers.length; i < len; i++) {
    DateRangePicker.dateRangePickerInterface(dateRangePickers[i])
  }
})
EventHandler.on(document, EVENT_CLICK_DATA_API, DateRangePicker.clearMenus)
EventHandler.on(document, EVENT_KEYUP_DATA_API, DateRangePicker.clearMenus)

/**
 * jQuery
 */

defineJQueryPlugin(DateRangePicker)

export default DateRangePicker