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import { PortalTarget, Wormhole } from 'portal-vue'
import { Vue } from '../../vue'
import { NAME_TOASTER } from '../../constants/components'
import { EVENT_NAME_DESTROYED, HOOK_EVENT_NAME_BEFORE_DESTROY } from '../../constants/events'
import { PROP_TYPE_STRING } from '../../constants/props'
import { removeClass, requestAF } from '../../utils/dom'
import { getRootEventName } from '../../utils/events'
import { makeProp, makePropsConfigurable } from '../../utils/props'
import { warn } from '../../utils/warn'
import { listenOnRootMixin } from '../../mixins/listen-on-root'
import { normalizeSlotMixin } from '../../mixins/normalize-slot'

// --- Helper components ---

// @vue/component
export const DefaultTransition = /*#__PURE__*/ Vue.extend({
  mixins: [normalizeSlotMixin],
  data() {
    return {
      // Transition classes base name
      name: 'b-toaster'
    }
  },
  methods: {
    onAfterEnter(el) {
      // Work around a Vue.js bug where `*-enter-to` class is not removed
      // See: https://github.com/vuejs/vue/pull/7901
      // The `*-move` class is also stuck on elements that moved,
      // but there are no JavaScript hooks to handle after move
      // See: https://github.com/vuejs/vue/pull/7906
      requestAF(() => {
        removeClass(el, `${this.name}-enter-to`)
      })
    }
  },
  render(h) {
    return h(
      'transition-group',
      {
        props: { tag: 'div', name: this.name },
        on: { afterEnter: this.onAfterEnter }
      },
      this.normalizeSlot()
    )
  }
})

// --- Props ---

export const props = makePropsConfigurable(
  {
    // Allowed: 'true' or 'false' or `null`
    ariaAtomic: makeProp(PROP_TYPE_STRING),
    ariaLive: makeProp(PROP_TYPE_STRING),
    name: makeProp(PROP_TYPE_STRING, undefined, true), // Required
    // Aria role
    role: makeProp(PROP_TYPE_STRING)
  },
  NAME_TOASTER
)

// --- Main component ---

// @vue/component
export const BToaster = /*#__PURE__*/ Vue.extend({
  name: NAME_TOASTER,
  mixins: [listenOnRootMixin],
  props,
  data() {
    return {
      // We don't render on SSR or if a an existing target found
      doRender: false,
      dead: false,
      // Toaster names cannot change once created
      staticName: this.name
    }
  },
  beforeMount() {
    const { name } = this
    this.staticName = name

    /* istanbul ignore if */
    if (Wormhole.hasTarget(name)) {
      warn(`A "<portal-target>" with name "${name}" already exists in the document.`, NAME_TOASTER)
      this.dead = true
    } else {
      this.doRender = true
      this.$once(HOOK_EVENT_NAME_BEFORE_DESTROY, () => {
        // Let toasts made with `this.$bvToast.toast()` know that this toaster
        // is being destroyed and should should also destroy/hide themselves
        this.emitOnRoot(getRootEventName(NAME_TOASTER, EVENT_NAME_DESTROYED), name)
      })
    }
  },
  destroyed() {
    // Remove from DOM if needed
    const { $el } = this
    /* istanbul ignore next: difficult to test */
    if ($el && $el.parentNode) {
      $el.parentNode.removeChild($el)
    }
  },
  render(h) {
    let $toaster = h('div', { class: ['d-none', { 'b-dead-toaster': this.dead }] })
    if (this.doRender) {
      const $target = h(PortalTarget, {
        staticClass: 'b-toaster-slot',
        props: {
          name: this.staticName,
          multiple: true,
          tag: 'div',
          slim: false,
          // transition: this.transition || DefaultTransition
          transition: DefaultTransition
        }
      })

      $toaster = h(
        'div',
        {
          staticClass: 'b-toaster',
          class: [this.staticName],
          attrs: {
            id: this.staticName,
            // Fallback to null to make sure attribute doesn't exist
            role: this.role || null,
            'aria-live': this.ariaLive,
            'aria-atomic': this.ariaAtomic
          }
        },
        [$target]
      )
    }

    return $toaster
  }
})