<!--
// Copyright © 2020, 2021 Anticrm Platform Contributors.
// Copyright © 2021, 2023, 2024 Hardcore Engineering Inc.
//
// Licensed under the Eclipse Public License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License. You may
// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
-->
<script lang="ts">
  import { SearchResultDoc } from '@hcengineering/core'
  import { getResource } from '@hcengineering/platform'
  import presentation, {
    SearchResult,
    getClient,
    reduceCalls,
    searchFor,
    type SearchItem
  } from '@hcengineering/presentation'
  import { Label, ListView, resizeObserver } from '@hcengineering/ui'
  import view from '@hcengineering/view'
  import { createEventDispatcher } from 'svelte'

  export let query: string = ''

  const client = getClient()
  const hierarchy = client.getHierarchy()

  let items: SearchItem[] = []

  const dispatch = createEventDispatcher()

  let list: ListView
  let scrollContainer: HTMLElement
  let selection = 0

  async function getIdentifier (item: SearchResultDoc): Promise<string | undefined> {
    const identifierProvider = hierarchy.classHierarchyMixin(item.doc._class, view.mixin.ObjectIdentifier)
    if (identifierProvider === undefined) {
      return item.shortTitle ?? item.title
    }

    const resource = await getResource(identifierProvider.provider)
    return await resource(client, item.id)
  }

  async function handleSelectItem (item: SearchResultDoc): Promise<void> {
    const identifier = await getIdentifier(item)
    dispatch('close', {
      id: item.id,
      label: identifier,
      objectclass: item.doc._class
    })
  }

  export function onKeyDown (key: KeyboardEvent): boolean {
    if (key.key === 'ArrowDown') {
      key.stopPropagation()
      key.preventDefault()
      list?.select(selection + 1)
      return true
    }
    if (key.key === 'ArrowUp') {
      key.stopPropagation()
      key.preventDefault()
      if (selection === 0 && scrollContainer !== undefined) {
        scrollContainer.scrollTop = 0
      }
      list?.select(selection - 1)
      return true
    }
    if (key.key === 'Enter' || key.key === 'Tab') {
      key.preventDefault()
      key.stopPropagation()
      if (selection < items.length) {
        const searchItem = items[selection]
        void handleSelectItem(searchItem.item)
        return true
      } else {
        return false
      }
    }
    return false
  }

  const updateItems = reduceCalls(async function (localQuery: string): Promise<void> {
    const r = await searchFor('mention', localQuery)
    if (r.query === query) {
      items = r.items
    }
  })
  $: void updateItems(query)
</script>

{#if (items.length === 0 && query !== '') || items.length > 0}
  <!-- svelte-ignore a11y-no-noninteractive-element-interactions -->
  <form class="antiPopup mentionPoup" on:keydown={onKeyDown} use:resizeObserver={() => dispatch('changeSize')}>
    <div class="ap-scroll" bind:this={scrollContainer}>
      <div class="ap-box">
        {#if items.length === 0 && query !== ''}
          <div class="noResults"><Label label={presentation.string.NoResults} /></div>
        {/if}
        {#if items.length > 0}
          <!-- svelte-ignore a11y-click-events-have-key-events -->
          <ListView bind:this={list} bind:selection count={items.length}>
            <svelte:fragment slot="category" let:item={num}>
              {@const item = items[num]}
              {#if item.num === 0}
                <div class="mentonCategory">
                  <Label label={item.category.title} />
                </div>
              {/if}
            </svelte:fragment>
            <svelte:fragment slot="item" let:item={num}>
              {@const item = items[num]}
              {@const doc = item.item}
              <!-- svelte-ignore a11y-no-static-element-interactions -->
              <div
                class="ap-menuItem withComp h-8"
                on:click={() => {
                  void handleSelectItem(doc)
                }}
              >
                <SearchResult value={doc} />
              </div>
            </svelte:fragment>
          </ListView>
        {/if}
      </div>
    </div>
    <div class="ap-space x2" />
  </form>
{/if}

<style lang="scss">
  .noResults {
    display: flex;
    padding: 0.25rem 1rem;
    align-items: center;
    align-self: stretch;
  }

  .mentionPoup {
    padding-top: 0.5rem;
  }

  .mentonCategory {
    padding: 0.5rem 1rem;
    font-size: 0.625rem;
    letter-spacing: 0.0625rem;
    color: var(--theme-dark-color);
    text-transform: uppercase;
    line-height: 1rem;
  }
</style>
