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/**

 * --------------------------------------------------------------------------

 * Bootstrap dropdown.js

 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)

 * --------------------------------------------------------------------------

 */

import * as Popper from 'core/popper2'

import BaseComponent from './base-component'

import EventHandler from './dom/event-handler'

import Manipulator from './dom/manipulator'

import SelectorEngine from './dom/selector-engine'

import {

  defineJQueryPlugin,

  execute,

  getElement,

  getNextActiveElement,

  isDisabled,

  isElement,

  isRTL,

  isVisible,

  noop

} from './util/index'

/**

 * Constants

 */

const NAME = 'dropdown'

const DATA_KEY = 'bs.dropdown'

const EVENT_KEY = `.${DATA_KEY}`

const DATA_API_KEY = '.data-api'

const ESCAPE_KEY = 'Escape'

const TAB_KEY = 'Tab'

const ARROW_UP_KEY = 'ArrowUp'

const ARROW_DOWN_KEY = 'ArrowDown'

const RIGHT_MOUSE_BUTTON = 2 // MouseEvent.button value for the secondary button, usually the right button

const EVENT_HIDE = `hide${EVENT_KEY}`

const EVENT_HIDDEN = `hidden${EVENT_KEY}`

const EVENT_SHOW = `show${EVENT_KEY}`

const EVENT_SHOWN = `shown${EVENT_KEY}`

const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`

const EVENT_KEYDOWN_DATA_API = `keydown${EVENT_KEY}${DATA_API_KEY}`

const EVENT_KEYUP_DATA_API = `keyup${EVENT_KEY}${DATA_API_KEY}`

const CLASS_NAME_SHOW = 'show'

const CLASS_NAME_DROPUP = 'dropup'

const CLASS_NAME_DROPEND = 'dropend'

const CLASS_NAME_DROPSTART = 'dropstart'

const CLASS_NAME_DROPUP_CENTER = 'dropup-center'

const CLASS_NAME_DROPDOWN_CENTER = 'dropdown-center'

const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="dropdown"]:not(.disabled):not(:disabled)'

const SELECTOR_DATA_TOGGLE_SHOWN = `${SELECTOR_DATA_TOGGLE}.${CLASS_NAME_SHOW}`

const SELECTOR_MENU = '.dropdown-menu'

const SELECTOR_NAVBAR = '.navbar'

const SELECTOR_NAVBAR_NAV = '.navbar-nav'

const SELECTOR_VISIBLE_ITEMS = '.dropdown-menu .dropdown-item:not(.disabled):not(:disabled)'

const PLACEMENT_TOP = isRTL() ? 'top-end' : 'top-start'

const PLACEMENT_TOPEND = isRTL() ? 'top-start' : 'top-end'

const PLACEMENT_BOTTOM = isRTL() ? 'bottom-end' : 'bottom-start'

const PLACEMENT_BOTTOMEND = isRTL() ? 'bottom-start' : 'bottom-end'

const PLACEMENT_RIGHT = isRTL() ? 'left-start' : 'right-start'

const PLACEMENT_LEFT = isRTL() ? 'right-start' : 'left-start'

const PLACEMENT_TOPCENTER = 'top'

const PLACEMENT_BOTTOMCENTER = 'bottom'

const Default = {

  autoClose: true,

  boundary: 'clippingParents',

  display: 'dynamic',

  offset: [0, 2],

  popperConfig: null,

  reference: 'toggle'

}

const DefaultType = {

  autoClose: '(boolean|string)',

  boundary: '(string|element)',

  display: 'string',

  offset: '(array|string|function)',

  popperConfig: '(null|object|function)',

  reference: '(string|element|object)'

}

/**

 * Class definition

 */

class Dropdown extends BaseComponent {

  constructor(element, config) {

    super(element, config)

    this._popper = null

    this._parent = this._element.parentNode // dropdown wrapper

    // TODO: v6 revert #37011 & change markup https://getbootstrap.com/docs/5.3/forms/input-group/

    this._menu = SelectorEngine.next(this._element, SELECTOR_MENU)[0] ||

      SelectorEngine.prev(this._element, SELECTOR_MENU)[0] ||

      SelectorEngine.findOne(SELECTOR_MENU, this._parent)

    this._inNavbar = this._detectNavbar()

  }

  // 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 (isDisabled(this._element) || this._isShown()) {

      return

    }

    const relatedTarget = {

      relatedTarget: this._element

    }

    const showEvent = EventHandler.trigger(this._element, EVENT_SHOW, relatedTarget)

    if (showEvent.defaultPrevented) {

      return

    }

    this._createPopper()

    // If this is a touch-enabled device we add extra

    // empty mouseover listeners to the body's immediate children;

    // only needed because of broken event delegation on iOS

    // https://www.quirksmode.org/blog/archives/2014/02/mouse_event_bub.html

    if ('ontouchstart' in document.documentElement && !this._parent.closest(SELECTOR_NAVBAR_NAV)) {

      for (const element of [].concat(...document.body.children)) {

        EventHandler.on(element, 'mouseover', noop)

      }

    }

    this._element.focus()

    this._element.setAttribute('aria-expanded', true)

    this._menu.classList.add(CLASS_NAME_SHOW)

    this._element.classList.add(CLASS_NAME_SHOW)

    EventHandler.trigger(this._element, EVENT_SHOWN, relatedTarget)

  }

  hide() {

    if (isDisabled(this._element) || !this._isShown()) {

      return

    }

    const relatedTarget = {

      relatedTarget: this._element

    }

    this._completeHide(relatedTarget)

  }

  dispose() {

    if (this._popper) {

      this._popper.destroy()

    }

    super.dispose()

  }

  update() {

    this._inNavbar = this._detectNavbar()

    if (this._popper) {

      this._popper.update()

    }

  }

  // Private

  _completeHide(relatedTarget) {

    const hideEvent = EventHandler.trigger(this._element, EVENT_HIDE, relatedTarget)

    if (hideEvent.defaultPrevented) {

      return

    }

    // If this is a touch-enabled device we remove the extra

    // empty mouseover listeners we added for iOS support

    if ('ontouchstart' in document.documentElement) {

      for (const element of [].concat(...document.body.children)) {

        EventHandler.off(element, 'mouseover', noop)

      }

    }

    if (this._popper) {

      this._popper.destroy()

    }

    this._menu.classList.remove(CLASS_NAME_SHOW)

    this._element.classList.remove(CLASS_NAME_SHOW)

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

    Manipulator.removeDataAttribute(this._menu, 'popper')

    EventHandler.trigger(this._element, EVENT_HIDDEN, relatedTarget)

  }

  _getConfig(config) {

    config = super._getConfig(config)

    if (typeof config.reference === 'object' && !isElement(config.reference) &&

      typeof config.reference.getBoundingClientRect !== 'function'

    ) {

      // Popper virtual elements require a getBoundingClientRect method

      throw new TypeError(`${NAME.toUpperCase()}: Option "reference" provided type "object" without a required "getBoundingClientRect" method.`)

    }

    return config

  }

  _createPopper() {

    if (typeof Popper === 'undefined') {

      throw new TypeError('Bootstrap\'s dropdowns require Popper (https://popper.js.org)')

    }

    let referenceElement = this._element

    if (this._config.reference === 'parent') {

      referenceElement = this._parent

    } else if (isElement(this._config.reference)) {

      referenceElement = getElement(this._config.reference)

    } else if (typeof this._config.reference === 'object') {

      referenceElement = this._config.reference

    }

    const popperConfig = this._getPopperConfig()

    this._popper = Popper.createPopper(referenceElement, this._menu, popperConfig)

  }

  _isShown() {

    return this._menu.classList.contains(CLASS_NAME_SHOW)

  }

  _getPlacement() {

    const parentDropdown = this._parent

    if (parentDropdown.classList.contains(CLASS_NAME_DROPEND)) {

      return PLACEMENT_RIGHT

    }

    if (parentDropdown.classList.contains(CLASS_NAME_DROPSTART)) {

      return PLACEMENT_LEFT

    }

    if (parentDropdown.classList.contains(CLASS_NAME_DROPUP_CENTER)) {

      return PLACEMENT_TOPCENTER

    }

    if (parentDropdown.classList.contains(CLASS_NAME_DROPDOWN_CENTER)) {

      return PLACEMENT_BOTTOMCENTER

    }

    // We need to trim the value because custom properties can also include spaces

    const isEnd = getComputedStyle(this._menu).getPropertyValue('--bs-position').trim() === 'end'

    if (parentDropdown.classList.contains(CLASS_NAME_DROPUP)) {

      return isEnd ? PLACEMENT_TOPEND : PLACEMENT_TOP

    }

    return isEnd ? PLACEMENT_BOTTOMEND : PLACEMENT_BOTTOM

  }

  _detectNavbar() {

    return this._element.closest(SELECTOR_NAVBAR) !== null

  }

  _getOffset() {

    const { offset } = this._config

    if (typeof offset === 'string') {

      return offset.split(',').map(value => Number.parseInt(value, 10))

    }

    if (typeof offset === 'function') {

      return popperData => offset(popperData, this._element)

    }

    return offset

  }

  _getPopperConfig() {

    const defaultBsPopperConfig = {

      placement: this._getPlacement(),

      modifiers: [{

        name: 'preventOverflow',

        options: {

          boundary: this._config.boundary

        }

      },

      {

        name: 'offset',

        options: {

          offset: this._getOffset()

        }

      }]

    }

    // Disable Popper if we have a static display or Dropdown is in Navbar

    if (this._inNavbar || this._config.display === 'static') {

      Manipulator.setDataAttribute(this._menu, 'popper', 'static') // TODO: v6 remove

      defaultBsPopperConfig.modifiers = [{

        name: 'applyStyles',

        enabled: false

      }]

    }

    return {

      ...defaultBsPopperConfig,

      ...execute(this._config.popperConfig, [defaultBsPopperConfig])

    }

  }

  _selectMenuItem({ key, target }) {

    const items = SelectorEngine.find(SELECTOR_VISIBLE_ITEMS, this._menu).filter(element => isVisible(element))

    if (!items.length) {

      return

    }

    // if target isn't included in items (e.g. when expanding the dropdown)

    // allow cycling to get the last item in case key equals ARROW_UP_KEY

    getNextActiveElement(items, target, key === ARROW_DOWN_KEY, !items.includes(target)).focus()

  }

  // Static

  static jQueryInterface(config) {

    return this.each(function () {

      const data = Dropdown.getOrCreateInstance(this, config)

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

        return

      }

      if (typeof data[config] === 'undefined') {

        throw new TypeError(`No method named "${config}"`)

      }

      data[config]()

    })

  }

  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 = Dropdown.getInstance(toggle)

      if (!context || context._config.autoClose === false) {

        continue

      }

      const composedPath = event.composedPath()

      const isMenuTarget = composedPath.includes(context._menu)

      if (

        composedPath.includes(context._element) ||

        (context._config.autoClose === 'inside' && !isMenuTarget) ||

        (context._config.autoClose === 'outside' && isMenuTarget)

      ) {

        continue

      }

      // Tab navigation through the dropdown menu or events from contained inputs shouldn't close the menu

      if (context._menu.contains(event.target) && ((event.type === 'keyup' && event.key === TAB_KEY) || /input|select|option|textarea|form/i.test(event.target.tagName))) {

        continue

      }

      const relatedTarget = { relatedTarget: context._element }

      if (event.type === 'click') {

        relatedTarget.clickEvent = event

      }

      context._completeHide(relatedTarget)

    }

  }

  static dataApiKeydownHandler(event) {

    // If not an UP | DOWN | ESCAPE key => not a dropdown command

    // If input/textarea && if key is other than ESCAPE => not a dropdown command

    const isInput = /input|textarea/i.test(event.target.tagName)

    const isEscapeEvent = event.key === ESCAPE_KEY

    const isUpOrDownEvent = [ARROW_UP_KEY, ARROW_DOWN_KEY].includes(event.key)

    if (!isUpOrDownEvent && !isEscapeEvent) {

      return

    }

    if (isInput && !isEscapeEvent) {

      return

    }

    event.preventDefault()

    // TODO: v6 revert #37011 & change markup https://getbootstrap.com/docs/5.3/forms/input-group/

    const getToggleButton = this.matches(SELECTOR_DATA_TOGGLE) ?

      this :

      (SelectorEngine.prev(this, SELECTOR_DATA_TOGGLE)[0] ||

        SelectorEngine.next(this, SELECTOR_DATA_TOGGLE)[0] ||

        SelectorEngine.findOne(SELECTOR_DATA_TOGGLE, event.delegateTarget.parentNode))

    const instance = Dropdown.getOrCreateInstance(getToggleButton)

    if (isUpOrDownEvent) {

      event.stopPropagation()

      instance.show()

      instance._selectMenuItem(event)

      return

    }

    if (instance._isShown()) { // else is escape and we check if it is shown

      event.stopPropagation()

      instance.hide()

      getToggleButton.focus()

    }

  }

}

/**

 * Data API implementation

 */

EventHandler.on(document, EVENT_KEYDOWN_DATA_API, SELECTOR_DATA_TOGGLE, Dropdown.dataApiKeydownHandler)

EventHandler.on(document, EVENT_KEYDOWN_DATA_API, SELECTOR_MENU, Dropdown.dataApiKeydownHandler)

EventHandler.on(document, EVENT_CLICK_DATA_API, Dropdown.clearMenus)

EventHandler.on(document, EVENT_KEYUP_DATA_API, Dropdown.clearMenus)

EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (event) {

  event.preventDefault()

  Dropdown.getOrCreateInstance(this).toggle()

})

/**

 * jQuery

 */

defineJQueryPlugin(Dropdown)

export default Dropdown