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

import * as Popper from '@popperjs/core'
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'
import type { DelegatedEvent } from './dom/event-handler'
import type { ComponentConfig as BaseComponentConfig, JQueryCollectionLike } from './types'

type PopperOffsetData = { placement: Popper.Placement; reference: Popper.Rect; popper: Popper.Rect }
type PopperOffsetFunction = (popperData: PopperOffsetData) => number[]
type PopperConfigFunction = (defaultConfig: Partial<Popper.Options>) => Partial<Popper.Options>

type ComponentConfig = {
  autoClose: boolean | 'inside' | 'outside'
  boundary: Popper.Boundary
  display: 'dynamic' | 'static'
  offset: number[] | string | ((popperData: PopperOffsetData, element: HTMLElement) => number[])
  popperConfig: Partial<Popper.Options> | PopperConfigFunction | null
  reference: 'toggle' | 'parent' | HTMLElement | Popper.VirtualElement
}

type ComponentConfigInput = Partial<ComponentConfig> & Record<string, unknown>

type RelatedTarget = { relatedTarget: HTMLElement; clickEvent?: Event }

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

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), [data-tblr-toggle="dropdown"]:not(.disabled):not(:disabled)'
const SELECTOR_DATA_TOGGLE_SHOWN = SELECTOR_DATA_TOGGLE.split(', ')
  .map((selector) => `${selector}.${CLASS_NAME_SHOW}`)
  .join(', ')
const SELECTOR_MENU = '.dropdown-menu'
const SELECTOR_NAVBAR = '.navbar'
const SELECTOR_NAVBAR_VERTICAL = '.navbar-vertical'
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: ComponentConfig = {
  autoClose: true,
  boundary: 'clippingParents',
  display: 'dynamic',
  offset: [0, 2],
  popperConfig: null,
  reference: 'toggle',
}

const DefaultType: Record<keyof ComponentConfig, string> = {
  autoClose: '(boolean|string)',
  boundary: '(string|element)',
  display: 'string',
  offset: '(array|string|function)',
  popperConfig: '(null|object|function)',
  reference: '(string|element|object)',
}

class Dropdown extends BaseComponent {
  declare _element: HTMLElement
  declare _config: ComponentConfig
  _popper: Popper.Instance | null
  _parent: HTMLElement
  _menu: HTMLElement
  _inNavbar: boolean

  constructor(element: HTMLElement | string, config?: ComponentConfigInput) {
    super(element, config)

    this._popper = null
    this._parent = this._element.parentNode as HTMLElement
    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()
  }

  static get Default(): ComponentConfig {
    return Default
  }

  static get DefaultType(): Record<keyof ComponentConfig, string> {
    return DefaultType
  }

  static get NAME(): string {
    return NAME
  }

  toggle(): void {
    if (this._isShown()) {
      this.hide()
    } else {
      this.show()
    }
  }

  show(): void {
    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 ('ontouchstart' in document.documentElement && !this._parent.closest(SELECTOR_NAVBAR_NAV)) {
      for (const element of Array.from(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(): void {
    if (isDisabled(this._element) || !this._isShown()) {
      return
    }

    const relatedTarget = {
      relatedTarget: this._element,
    }

    this._completeHide(relatedTarget)
  }

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

    super.dispose()
  }

  update(): void {
    this._inNavbar = this._detectNavbar()
    if (this._popper) {
      void this._popper.update()
    }
  }

  _isStatic(): boolean {
    if (this._config.display === 'static') {
      return true
    }

    if (!this._inNavbar) {
      return false
    }

    return this._element.closest(SELECTOR_NAVBAR_VERTICAL) !== null || getComputedStyle(this._menu).position === 'static'
  }

  _completeHide(relatedTarget: RelatedTarget): void {
    const hideEvent = EventHandler.trigger(this._element, EVENT_HIDE, relatedTarget)
    if (hideEvent?.defaultPrevented) {
      return
    }

    if ('ontouchstart' in document.documentElement) {
      for (const element of Array.from(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?: ComponentConfigInput): ComponentConfig {
    const merged = super._getConfig(config) as ComponentConfig

    if (typeof merged.reference === 'object' && !isElement(merged.reference) && typeof merged.reference.getBoundingClientRect !== 'function') {
      throw new TypeError(`${NAME.toUpperCase()}: Option "reference" provided type "object" without a required "getBoundingClientRect" method.`)
    }

    return merged
  }

  _createPopper(): void {
    if (typeof Popper === 'undefined') {
      throw new TypeError("Bootstrap's dropdowns require Popper (https://popper.js.org/docs/v2/)")
    }

    let referenceElement: HTMLElement | Popper.VirtualElement = 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(): boolean {
    return this._menu.classList.contains(CLASS_NAME_SHOW)
  }

  _getPlacement(): string {
    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
    }

    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(): boolean {
    return this._element.closest(SELECTOR_NAVBAR) !== null
  }

  _getOffset(): number[] | PopperOffsetFunction {
    const { offset } = this._config

    if (typeof offset === 'string') {
      return offset.split(',').map((value) => Number.parseInt(value, 10))
    }

    if (typeof offset === 'function') {
      return (popperData: PopperOffsetData) => offset(popperData, this._element)
    }

    return offset
  }

  _getPopperConfig(): Partial<Popper.Options> {
    const defaultBsPopperConfig: Partial<Popper.Options> = {
      placement: this._getPlacement() as Popper.Placement,
      modifiers: [
        {
          name: 'preventOverflow',
          options: {
            boundary: this._config.boundary,
          },
        },
        {
          name: 'offset',
          options: {
            offset: this._getOffset(),
          },
        },
      ],
    }

    if (this._isStatic()) {
      Manipulator.setDataAttribute(this._menu, 'popper', 'static')
      defaultBsPopperConfig.modifiers = [
        {
          name: 'applyStyles',
          enabled: false,
        },
      ]
    }

    const popperConfig = execute(this._config.popperConfig, [undefined, defaultBsPopperConfig])
    return {
      ...defaultBsPopperConfig,
      ...(typeof popperConfig === 'object' && popperConfig !== null ? popperConfig : {}),
    }
  }

  _selectMenuItem({ key, target }: { key: string; target: EventTarget | null }): void {
    const items = SelectorEngine.find(SELECTOR_VISIBLE_ITEMS, this._menu).filter((element) => isVisible(element))

    if (!items.length) {
      return
    }

    const activeElement = target as HTMLElement
    getNextActiveElement(items, activeElement, key === ARROW_DOWN_KEY, !items.includes(activeElement)).focus()
  }

  static clearMenus(event: Event & { button?: number; key?: string; composedPath?: () => EventTarget[] }): void {
    if ((event as MouseEvent).button === RIGHT_MOUSE_BUTTON || (event.type === 'keyup' && (event as KeyboardEvent).key !== TAB_KEY)) {
      return
    }

    const openToggles = SelectorEngine.find(SELECTOR_DATA_TOGGLE_SHOWN)

    for (const toggle of openToggles) {
      const context = Dropdown.getInstance(toggle) as Dropdown | null
      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
      }

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

      const relatedTarget: RelatedTarget = { relatedTarget: context._element }

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

      context._completeHide(relatedTarget)
    }
  }

  static dataApiKeydownHandler(this: HTMLElement, event: KeyboardEvent): void {
    const isInput = /input|textarea/i.test((event.target as HTMLElement).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()

    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 as DelegatedEvent<KeyboardEvent>).delegateTarget.parentNode as Element)

    const instance = Dropdown.getOrCreateInstance(getToggleButton) as Dropdown

    if (isUpOrDownEvent) {
      event.stopPropagation()
      instance.show()
      instance._selectMenuItem(event)
      return
    }

    if (instance._isShown()) {
      event.stopPropagation()
      instance.hide()
      getToggleButton.focus()
    }
  }

  static jQueryInterface(this: JQueryCollectionLike, config?: unknown): unknown {
    return this.each(function (this: HTMLElement) {
      const data = Dropdown.getOrCreateInstance(this, config as BaseComponentConfig) as unknown as Record<string, (arg?: unknown) => unknown>

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

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

      data[config]()
    })
  }
}

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 (this: HTMLElement, event: Event) {
  event.preventDefault()
  ;(Dropdown.getOrCreateInstance(this) as Dropdown).toggle()
})

defineJQueryPlugin(Dropdown)

export default Dropdown