import Base from './base'
import Util from './util'

const CollapseInline = (($) => {

  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */
  const NAME = 'collapseInline'
  const DATA_KEY = `bmd.${NAME}`
  const JQUERY_NAME = `bmd${NAME.charAt(0).toUpperCase() + NAME.slice(1)}`
  const JQUERY_NO_CONFLICT = $.fn[JQUERY_NAME]

  const Selector = {
    ANY_INPUT: 'input, select, textarea'
  }

  const ClassName = {
    IN: 'in',
    COLLAPSE: 'collapse',
    COLLAPSING: 'collapsing',
    COLLAPSED: 'collapsed',
    WIDTH: 'width'
  }
  const Default = {}

  /**
   * ------------------------------------------------------------------------
   * Class Definition
   * ------------------------------------------------------------------------
   */
  class CollapseInline extends Base {

    // $element is expected to be the trigger
    //  i.e. <button class="btn bmd-btn-icon" for="search" data-toggle="collapse" data-target="#search-field" aria-expanded="false" aria-controls="search-field">
    constructor($element, config) {
      super($element, $.extend(true, {}, Default, config))
      this.$bmdFormGroup = this.findMdbFormGroup(true)

      let collapseSelector = $element.data('target')
      this.$collapse = $(collapseSelector)

      Util.assert($element, this.$collapse.length === 0, `Cannot find collapse target for ${Util.describe($element)}`)
      Util.assert(this.$collapse, !this.$collapse.hasClass(ClassName.COLLAPSE), `${Util.describe(this.$collapse)} is expected to have the '${ClassName.COLLAPSE}' class.  It is being targeted by ${Util.describe($element)}`)

      // find the first input for focusing
      let $inputs = this.$bmdFormGroup.find(Selector.ANY_INPUT)
      if ($inputs.length > 0) {
        this.$input = $inputs.first()
      }

      // automatically add the marker class to collapse width instead of height - nice convenience because it is easily forgotten
      if (!this.$collapse.hasClass(ClassName.WIDTH)) {
        this.$collapse.addClass(ClassName.WIDTH)
      }

      if (this.$input) {
        // add a listener to set focus
        this.$collapse.on('shown.bs.collapse', () => {
          this.$input.focus()
        })

        // add a listener to collapse field
        this.$input.blur(() => {
          this.$collapse.collapse('hide')
        })
      }
    }

    dispose() {
      super.dispose(DATA_KEY)
      this.$bmdFormGroup = null
      this.$collapse = null
      this.$input = null
    }

    // ------------------------------------------------------------------------
    // private

    // ------------------------------------------------------------------------
    // static
    static _jQueryInterface(config) {
      return this.each(function () {
        let $element = $(this)
        let data = $element.data(DATA_KEY)

        if (!data) {
          data = new CollapseInline($element, config)
          $element.data(DATA_KEY, data)
        }
      })
    }
  }

  /**
   * ------------------------------------------------------------------------
   * jQuery
   * ------------------------------------------------------------------------
   */
  $.fn[JQUERY_NAME] = CollapseInline._jQueryInterface
  $.fn[JQUERY_NAME].Constructor = CollapseInline
  $.fn[JQUERY_NAME].noConflict = () => {
    $.fn[JQUERY_NAME] = JQUERY_NO_CONFLICT
    return CollapseInline._jQueryInterface
  }

  return CollapseInline

})(jQuery)

export default CollapseInline