/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.3.1): alert.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */

import {
  jQuery as $,
  TRANSITION_END,
  emulateTransitionEnd,
  getSelectorFromElement,
  getTransitionDurationFromElement
} from './util/index'
import Data from './dom/data'
import EventHandler from './dom/eventHandler'
import SelectorEngine from './dom/selectorEngine'

/**
 * ------------------------------------------------------------------------
 * Constants
 * ------------------------------------------------------------------------
 */

const NAME = 'alert'
const VERSION = '4.3.1'
const DATA_KEY = 'bs.alert'
const EVENT_KEY = `.${DATA_KEY}`
const DATA_API_KEY = '.data-api'

const Selector = {
  DISMISS: '[data-dismiss="alert"]'
}

const Event = {
  CLOSE: `close${EVENT_KEY}`,
  CLOSED: `closed${EVENT_KEY}`,
  CLICK_DATA_API: `click${EVENT_KEY}${DATA_API_KEY}`
}

const ClassName = {
  ALERT: 'alert',
  FADE: 'fade',
  SHOW: 'show'
}

/**
 * ------------------------------------------------------------------------
 * Class Definition
 * ------------------------------------------------------------------------
 */

class Alert {
  constructor(element) {
    this._element = element
    if (this._element) {
      Data.setData(element, DATA_KEY, this)
    }
  }

  // Getters

  static get VERSION() {
    return VERSION
  }

  // Public

  close(element) {
    let rootElement = this._element
    if (element) {
      rootElement = this._getRootElement(element)
    }

    const customEvent = this._triggerCloseEvent(rootElement)

    if (customEvent === null || customEvent.defaultPrevented) {
      return
    }

    this._removeElement(rootElement)
  }

  dispose() {
    Data.removeData(this._element, DATA_KEY)
    this._element = null
  }

  // Private

  _getRootElement(element) {
    const selector = getSelectorFromElement(element)
    let parent = false

    if (selector) {
      parent = SelectorEngine.findOne(selector)
    }

    if (!parent) {
      parent = SelectorEngine.closest(element, `.${ClassName.ALERT}`)
    }

    return parent
  }

  _triggerCloseEvent(element) {
    return EventHandler.trigger(element, Event.CLOSE)
  }

  _removeElement(element) {
    element.classList.remove(ClassName.SHOW)

    if (!element.classList.contains(ClassName.FADE)) {
      this._destroyElement(element)
      return
    }

    const transitionDuration = getTransitionDurationFromElement(element)

    EventHandler
      .one(element, TRANSITION_END, event => this._destroyElement(element, event))
    emulateTransitionEnd(element, transitionDuration)
  }

  _destroyElement(element) {
    if (element.parentNode) {
      element.parentNode.removeChild(element)
    }

    EventHandler.trigger(element, Event.CLOSED)
  }

  // Static

  static _jQueryInterface(config) {
    return this.each(function () {
      let data = Data.getData(this, DATA_KEY)

      if (!data) {
        data = new Alert(this)
      }

      if (config === 'close') {
        data[config](this)
      }
    })
  }

  static _handleDismiss(alertInstance) {
    return function (event) {
      if (event) {
        event.preventDefault()
      }

      alertInstance.close(this)
    }
  }

  static _getInstance(element) {
    return Data.getData(element, DATA_KEY)
  }
}

/**
 * ------------------------------------------------------------------------
 * Data Api implementation
 * ------------------------------------------------------------------------
 */
EventHandler
  .on(document, Event.CLICK_DATA_API, Selector.DISMISS, Alert._handleDismiss(new Alert()))

/**
 * ------------------------------------------------------------------------
 * jQuery
 * ------------------------------------------------------------------------
 * add .alert to jQuery only if jQuery is present
 */

if (typeof $ !== 'undefined') {
  const JQUERY_NO_CONFLICT = $.fn[NAME]
  $.fn[NAME] = Alert._jQueryInterface
  $.fn[NAME].Constructor = Alert
  $.fn[NAME].noConflict = () => {
    $.fn[NAME] = JQUERY_NO_CONFLICT
    return Alert._jQueryInterface
  }
}

export default Alert