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import { Vue } from '../../vue'
import { NAME_COLLAPSE, NAME_SIDEBAR } from '../../constants/components'
import { IS_BROWSER } from '../../constants/env'
import { EVENT_NAME_CHANGE, EVENT_NAME_HIDDEN, EVENT_NAME_SHOWN } from '../../constants/events'
import { CODE_ESC } from '../../constants/key-codes'
import {
  PROP_TYPE_ARRAY_OBJECT_STRING,
  PROP_TYPE_BOOLEAN,
  PROP_TYPE_BOOLEAN_STRING,
  PROP_TYPE_NUMBER_STRING,
  PROP_TYPE_STRING
} from '../../constants/props'
import {
  SLOT_NAME_DEFAULT,
  SLOT_NAME_FOOTER,
  SLOT_NAME_HEADER,
  SLOT_NAME_HEADER_CLOSE,
  SLOT_NAME_TITLE
} from '../../constants/slots'
import { attemptFocus, contains, getActiveElement, getTabables } from '../../utils/dom'
import { getRootActionEventName, getRootEventName } from '../../utils/events'
import { makeModelMixin } from '../../utils/model'
import { sortKeys } from '../../utils/object'
import { makeProp, makePropsConfigurable } from '../../utils/props'
import { attrsMixin } from '../../mixins/attrs'
import { idMixin, props as idProps } from '../../mixins/id'
import { listenOnRootMixin } from '../../mixins/listen-on-root'
import { normalizeSlotMixin } from '../../mixins/normalize-slot'
import { BIconX } from '../../icons/icons'
import { BButtonClose } from '../button/button-close'
import { BVTransition } from '../transition/bv-transition'

// --- Constants ---

const CLASS_NAME = 'b-sidebar'

const ROOT_ACTION_EVENT_NAME_REQUEST_STATE = getRootActionEventName(NAME_COLLAPSE, 'request-state')
const ROOT_ACTION_EVENT_NAME_TOGGLE = getRootActionEventName(NAME_COLLAPSE, 'toggle')

const ROOT_EVENT_NAME_STATE = getRootEventName(NAME_COLLAPSE, 'state')
const ROOT_EVENT_NAME_SYNC_STATE = getRootEventName(NAME_COLLAPSE, 'sync-state')

const {
  mixin: modelMixin,
  props: modelProps,
  prop: MODEL_PROP_NAME,
  event: MODEL_EVENT_NAME
} = makeModelMixin('visible', {
  type: PROP_TYPE_BOOLEAN,
  defaultValue: false,
  event: EVENT_NAME_CHANGE
})

// --- Props ---

export const props = makePropsConfigurable(
  sortKeys({
    ...idProps,
    ...modelProps,
    ariaLabel: makeProp(PROP_TYPE_STRING),
    ariaLabelledby: makeProp(PROP_TYPE_STRING),
    // If `true`, shows a basic backdrop
    backdrop: makeProp(PROP_TYPE_BOOLEAN, false),
    backdropVariant: makeProp(PROP_TYPE_STRING, 'dark'),
    bgVariant: makeProp(PROP_TYPE_STRING, 'light'),
    bodyClass: makeProp(PROP_TYPE_ARRAY_OBJECT_STRING),
    // `aria-label` for close button
    closeLabel: makeProp(PROP_TYPE_STRING),
    footerClass: makeProp(PROP_TYPE_ARRAY_OBJECT_STRING),
    headerClass: makeProp(PROP_TYPE_ARRAY_OBJECT_STRING),
    lazy: makeProp(PROP_TYPE_BOOLEAN, false),
    noCloseOnBackdrop: makeProp(PROP_TYPE_BOOLEAN, false),
    noCloseOnEsc: makeProp(PROP_TYPE_BOOLEAN, false),
    noCloseOnRouteChange: makeProp(PROP_TYPE_BOOLEAN, false),
    noEnforceFocus: makeProp(PROP_TYPE_BOOLEAN, false),
    noHeader: makeProp(PROP_TYPE_BOOLEAN, false),
    noHeaderClose: makeProp(PROP_TYPE_BOOLEAN, false),
    noSlide: makeProp(PROP_TYPE_BOOLEAN, false),
    right: makeProp(PROP_TYPE_BOOLEAN, false),
    shadow: makeProp(PROP_TYPE_BOOLEAN_STRING, false),
    sidebarClass: makeProp(PROP_TYPE_ARRAY_OBJECT_STRING),
    tag: makeProp(PROP_TYPE_STRING, 'div'),
    textVariant: makeProp(PROP_TYPE_STRING, 'dark'),
    title: makeProp(PROP_TYPE_STRING),
    width: makeProp(PROP_TYPE_STRING),
    zIndex: makeProp(PROP_TYPE_NUMBER_STRING)
  }),
  NAME_SIDEBAR
)

// --- Render methods ---

const renderHeaderTitle = (h, ctx) => {
  // Render a empty `<span>` when to title was provided
  const title = ctx.normalizeSlot(SLOT_NAME_TITLE, ctx.slotScope) || ctx.title
  if (!title) {
    return h('span')
  }

  return h('strong', { attrs: { id: ctx.safeId('__title__') } }, [title])
}

const renderHeaderClose = (h, ctx) => {
  if (ctx.noHeaderClose) {
    return h()
  }

  const { closeLabel, textVariant, hide } = ctx

  return h(
    BButtonClose,
    {
      props: { ariaLabel: closeLabel, textVariant },
      on: { click: hide },
      ref: 'close-button'
    },
    [ctx.normalizeSlot(SLOT_NAME_HEADER_CLOSE) || h(BIconX)]
  )
}

const renderHeader = (h, ctx) => {
  if (ctx.noHeader) {
    return h()
  }

  let $content = ctx.normalizeSlot(SLOT_NAME_HEADER, ctx.slotScope)
  if (!$content) {
    const $title = renderHeaderTitle(h, ctx)
    const $close = renderHeaderClose(h, ctx)
    $content = ctx.right ? [$close, $title] : [$title, $close]
  }

  return h(
    'header',
    {
      staticClass: `${CLASS_NAME}-header`,
      class: ctx.headerClass,
      key: 'header'
    },
    $content
  )
}

const renderBody = (h, ctx) => {
  return h(
    'div',
    {
      staticClass: `${CLASS_NAME}-body`,
      class: ctx.bodyClass,
      key: 'body'
    },
    [ctx.normalizeSlot(SLOT_NAME_DEFAULT, ctx.slotScope)]
  )
}

const renderFooter = (h, ctx) => {
  const $footer = ctx.normalizeSlot(SLOT_NAME_FOOTER, ctx.slotScope)
  if (!$footer) {
    return h()
  }

  return h(
    'footer',
    {
      staticClass: `${CLASS_NAME}-footer`,
      class: ctx.footerClass,
      key: 'footer'
    },
    [$footer]
  )
}

const renderContent = (h, ctx) => {
  // We render the header even if `lazy` is enabled as it
  // acts as the accessible label for the sidebar
  const $header = renderHeader(h, ctx)
  if (ctx.lazy && !ctx.isOpen) {
    return $header
  }

  return [$header, renderBody(h, ctx), renderFooter(h, ctx)]
}

const renderBackdrop = (h, ctx) => {
  if (!ctx.backdrop) {
    return h()
  }

  const { backdropVariant } = ctx

  return h('div', {
    directives: [{ name: 'show', value: ctx.localShow }],
    staticClass: 'b-sidebar-backdrop',
    class: { [`bg-${backdropVariant}`]: backdropVariant },
    on: { click: ctx.onBackdropClick }
  })
}

// --- Main component ---

// @vue/component
export const BSidebar = /*#__PURE__*/ Vue.extend({
  name: NAME_SIDEBAR,
  mixins: [attrsMixin, idMixin, modelMixin, listenOnRootMixin, normalizeSlotMixin],
  inheritAttrs: false,
  props,
  data() {
    const visible = !!this[MODEL_PROP_NAME]
    return {
      // Internal `v-model` state
      localShow: visible,
      // For lazy render triggering
      isOpen: visible
    }
  },
  computed: {
    transitionProps() {
      return this.noSlide
        ? /* istanbul ignore next */ { css: true }
        : {
            css: true,
            enterClass: '',
            enterActiveClass: 'slide',
            enterToClass: 'show',
            leaveClass: 'show',
            leaveActiveClass: 'slide',
            leaveToClass: ''
          }
    },
    slotScope() {
      const { hide, right, localShow: visible } = this
      return { hide, right, visible }
    },
    hasTitle() {
      const { $scopedSlots, $slots } = this
      return (
        !this.noHeader &&
        !this.hasNormalizedSlot(SLOT_NAME_HEADER) &&
        !!(this.normalizeSlot(SLOT_NAME_TITLE, this.slotScope, $scopedSlots, $slots) || this.title)
      )
    },
    titleId() {
      return this.hasTitle ? this.safeId('__title__') : null
    },
    computedAttrs() {
      return {
        ...this.bvAttrs,
        id: this.safeId(),
        tabindex: '-1',
        role: 'dialog',
        'aria-modal': this.backdrop ? 'true' : 'false',
        'aria-hidden': this.localShow ? null : 'true',
        'aria-label': this.ariaLabel || null,
        'aria-labelledby': this.ariaLabelledby || this.titleId || null
      }
    }
  },
  watch: {
    [MODEL_PROP_NAME](newValue, oldValue) {
      if (newValue !== oldValue) {
        this.localShow = newValue
      }
    },
    localShow(newValue, oldValue) {
      if (newValue !== oldValue) {
        this.emitState(newValue)
        this.$emit(MODEL_EVENT_NAME, newValue)
      }
    },
    /* istanbul ignore next */
    $route(newValue = {}, oldValue = {}) {
      if (!this.noCloseOnRouteChange && newValue.fullPath !== oldValue.fullPath) {
        this.hide()
      }
    }
  },
  created() {
    // Define non-reactive properties
    this.$_returnFocusEl = null
  },
  mounted() {
    // Add `$root` listeners
    this.listenOnRoot(ROOT_ACTION_EVENT_NAME_TOGGLE, this.handleToggle)
    this.listenOnRoot(ROOT_ACTION_EVENT_NAME_REQUEST_STATE, this.handleSync)
    // Send out a gratuitous state event to ensure toggle button is synced
    this.$nextTick(() => {
      this.emitState(this.localShow)
    })
  },
  /* istanbul ignore next */
  activated() {
    this.emitSync()
  },
  beforeDestroy() {
    this.localShow = false
    this.$_returnFocusEl = null
  },
  methods: {
    hide() {
      this.localShow = false
    },
    emitState(state = this.localShow) {
      this.emitOnRoot(ROOT_EVENT_NAME_STATE, this.safeId(), state)
    },
    emitSync(state = this.localShow) {
      this.emitOnRoot(ROOT_EVENT_NAME_SYNC_STATE, this.safeId(), state)
    },
    handleToggle(id) {
      // Note `safeId()` can be null until after mount
      if (id && id === this.safeId()) {
        this.localShow = !this.localShow
      }
    },
    handleSync(id) {
      // Note `safeId()` can be null until after mount
      if (id && id === this.safeId()) {
        this.$nextTick(() => {
          this.emitSync(this.localShow)
        })
      }
    },
    onKeydown(event) {
      const { keyCode } = event
      if (!this.noCloseOnEsc && keyCode === CODE_ESC && this.localShow) {
        this.hide()
      }
    },
    onBackdropClick() {
      if (this.localShow && !this.noCloseOnBackdrop) {
        this.hide()
      }
    },
    /* istanbul ignore next */
    onTopTrapFocus() {
      const tabables = getTabables(this.$refs.content)
      this.enforceFocus(tabables.reverse()[0])
    },
    /* istanbul ignore next */
    onBottomTrapFocus() {
      const tabables = getTabables(this.$refs.content)
      this.enforceFocus(tabables[0])
    },
    onBeforeEnter() {
      // Returning focus to `document.body` may cause unwanted scrolls,
      // so we exclude setting focus on body
      this.$_returnFocusEl = getActiveElement(IS_BROWSER ? [document.body] : [])
      // Trigger lazy render
      this.isOpen = true
    },
    onAfterEnter(el) {
      if (!contains(el, getActiveElement())) {
        this.enforceFocus(el)
      }
      this.$emit(EVENT_NAME_SHOWN)
    },
    onAfterLeave() {
      this.enforceFocus(this.$_returnFocusEl)
      this.$_returnFocusEl = null
      // Trigger lazy render
      this.isOpen = false
      this.$emit(EVENT_NAME_HIDDEN)
    },
    enforceFocus(el) {
      if (!this.noEnforceFocus) {
        attemptFocus(el)
      }
    }
  },
  render(h) {
    const { bgVariant, width, textVariant, localShow } = this
    const shadow = this.shadow === '' ? true : this.shadow

    let $sidebar = h(
      this.tag,
      {
        staticClass: CLASS_NAME,
        class: [
          {
            shadow: shadow === true,
            [`shadow-${shadow}`]: shadow && shadow !== true,
            [`${CLASS_NAME}-right`]: this.right,
            [`bg-${bgVariant}`]: bgVariant,
            [`text-${textVariant}`]: textVariant
          },
          this.sidebarClass
        ],
        style: { width },
        attrs: this.computedAttrs,
        directives: [{ name: 'show', value: localShow }],
        ref: 'content'
      },
      [renderContent(h, this)]
    )

    $sidebar = h(
      'transition',
      {
        props: this.transitionProps,
        on: {
          beforeEnter: this.onBeforeEnter,
          afterEnter: this.onAfterEnter,
          afterLeave: this.onAfterLeave
        }
      },
      [$sidebar]
    )

    const $backdrop = h(BVTransition, { props: { noFade: this.noSlide } }, [
      renderBackdrop(h, this)
    ])

    let $tabTrapTop = h()
    let $tabTrapBottom = h()
    if (this.backdrop && localShow) {
      $tabTrapTop = h('div', {
        attrs: { tabindex: '0' },
        on: { focus: this.onTopTrapFocus }
      })
      $tabTrapBottom = h('div', {
        attrs: { tabindex: '0' },
        on: { focus: this.onBottomTrapFocus }
      })
    }

    return h(
      'div',
      {
        staticClass: 'b-sidebar-outer',
        style: { zIndex: this.zIndex },
        attrs: { tabindex: '-1' },
        on: { keydown: this.onKeydown }
      },
      [$tabTrapTop, $sidebar, $tabTrapBottom, $backdrop]
    )
  }
})