/core/interactablePreventDefault.ts

import * as Interact from '@interactjs/types/index'
import { matchesSelector, nodeContains } from '@interactjs/utils/domUtils'
import is from '@interactjs/utils/is'
import { getWindow } from '@interactjs/utils/window'

declare module '@interactjs/core/Interactable' {
  interface Interactable {
    preventDefault: typeof preventDefault
    checkAndPreventDefault: (event: Event) => void
  }
}

type PreventDefaultValue = 'always' | 'never' | 'auto'
function preventDefault (this: Interact.Interactable): PreventDefaultValue
function preventDefault (this: Interact.Interactable, newValue: PreventDefaultValue): typeof this
function preventDefault (this: Interact.Interactable, newValue?: PreventDefaultValue) {
  if (/^(always|never|auto)$/.test(newValue)) {
    this.options.preventDefault = newValue
    return this
  }

  if (is.bool(newValue)) {
    this.options.preventDefault = newValue ? 'always' : 'never'
    return this
  }

  return this.options.preventDefault
}

function checkAndPreventDefault (interactable: Interact.Interactable, scope: Interact.Scope, event: Event) {
  const setting = interactable.options.preventDefault

  if (setting === 'never') { return }

  if (setting === 'always') {
    event.preventDefault()
    return
  }

  // setting === 'auto'

  // if the browser supports passive event listeners and isn't running on iOS,
  // don't preventDefault of touch{start,move} events. CSS touch-action and
  // user-select should be used instead of calling event.preventDefault().
  if (scope.events.supportsPassive && /^touch(start|move)$/.test(event.type)) {
    const doc = getWindow(event.target).document
    const docOptions = scope.getDocOptions(doc)

    if (!(docOptions && docOptions.events) || docOptions.events.passive !== false) {
      return
    }
  }

  // don't preventDefault of pointerdown events
  if (/^(mouse|pointer|touch)*(down|start)/i.test(event.type)) {
    return
  }

  // don't preventDefault on editable elements
  if (is.element(event.target) &&
      matchesSelector(event.target, 'input,select,textarea,[contenteditable=true],[contenteditable=true] *')) {
    return
  }

  event.preventDefault()
}

function onInteractionEvent ({ interaction, event }: { interaction: Interact.Interaction, event: Interact.PointerEventType }) {
  if (interaction.interactable) {
    interaction.interactable.checkAndPreventDefault(event as Event)
  }
}

export function install (scope: Interact.Scope) {
  /** @lends Interactable */
  const { Interactable } = scope

  /**
   * Returns or sets whether to prevent the browser's default behaviour in
   * response to pointer events. Can be set to:
   *  - `'always'` to always prevent
   *  - `'never'` to never prevent
   *  - `'auto'` to let interact.js try to determine what would be best
   *
   * @param {string} [newValue] `'always'`, `'never'` or `'auto'`
   * @return {string | Interactable} The current setting or this Interactable
   */
  Interactable.prototype.preventDefault = preventDefault

  Interactable.prototype.checkAndPreventDefault = function (event) {
    return checkAndPreventDefault(this, scope, event)
  }

  // prevent native HTML5 drag on interact.js target elements
  scope.interactions.docEvents.push({
    type: 'dragstart',
    listener (event) {
      for (const interaction of scope.interactions.list) {
        if (interaction.element &&
          (interaction.element === event.target ||
           nodeContains(interaction.element, event.target))) {
          interaction.interactable.checkAndPreventDefault(event)
          return
        }
      }
    },
  })
}

export default {
  id: 'core/interactablePreventDefault',
  install,
  listeners: ['down', 'move', 'up', 'cancel'].reduce((acc, eventType) => {
    acc[`interactions:${eventType}`] = onInteractionEvent
    return acc
  }, {} as any),
}