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/*
* Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
import {
EMPTY,
Observable,
Subject,
bufferCount,
filter,
finalize,
first,
fromEvent,
map,
merge,
mergeMap,
of,
share,
skipUntil,
switchMap,
takeUntil,
tap,
withLatestFrom,
zipWith
} from "rxjs"
import { translation } from "~/_"
import {
getElement,
getOptionalElement,
watchElementBoundary,
watchToggle
} from "~/browser"
import {
SearchMessage,
SearchResult,
isSearchReadyMessage,
isSearchResultMessage
} from "~/integrations"
import { renderSearchResultItem } from "~/templates"
import { round } from "~/utilities"
import { Component } from "../../_"
import { SearchQuery } from "../query"
/* ----------------------------------------------------------------------------
* Helper types
* ------------------------------------------------------------------------- */
/**
* Mount options
*/
interface MountOptions {
query$: Observable<SearchQuery> /* Search query observable */
worker$: Subject<SearchMessage> /* Search worker */
}
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Mount search result list
*
* This function performs a lazy rendering of the search results, depending on
* the vertical offset of the search result container.
*
* @param el - Search result list element
* @param options - Options
*
* @returns Search result list component observable
*/
export function mountSearchResult(
el: HTMLElement, { worker$, query$ }: MountOptions
): Observable<Component<SearchResult>> {
const push$ = new Subject<SearchResult>()
const boundary$ = watchElementBoundary(el.parentElement!)
.pipe(
filter(Boolean)
)
/* Retrieve container */
const container = el.parentElement!
/* Retrieve nested components */
const meta = getElement(":scope > :first-child", el)
const list = getElement(":scope > :last-child", el)
/* Reveal to accessibility tree – see https://bit.ly/3iAA7t8 */
watchToggle("search")
.subscribe(active => list.setAttribute(
"role", active ? "list" : "presentation"
))
/* Update search result metadata */
push$
.pipe(
withLatestFrom(query$),
skipUntil(worker$.pipe(first(isSearchReadyMessage)))
)
.subscribe(([{ items }, { value }]) => {
switch (items.length) {
/* No results */
case 0:
meta.textContent = value.length
? translation("search.result.none")
: translation("search.result.placeholder")
break
/* One result */
case 1:
meta.textContent = translation("search.result.one")
break
/* Multiple result */
default:
const count = round(items.length)
meta.textContent = translation("search.result.other", count)
}
})
/* Render search result item */
const render$ = push$
.pipe(
tap(() => list.innerHTML = ""),
switchMap(({ items }) => merge(
of(...items.slice(0, 10)),
of(...items.slice(10))
.pipe(
bufferCount(4),
zipWith(boundary$),
switchMap(([chunk]) => chunk)
)
)),
map(renderSearchResultItem),
share()
)
/* Update search result list */
render$.subscribe(item => list.appendChild(item))
render$
.pipe(
mergeMap(item => {
const details = getOptionalElement("details", item)
if (typeof details === "undefined")
return EMPTY
/* Keep position of details element stable */
return fromEvent(details, "toggle")
.pipe(
takeUntil(push$),
map(() => details)
)
})
)
.subscribe(details => {
if (
details.open === false &&
details.offsetTop <= container.scrollTop
)
container.scrollTo({ top: details.offsetTop })
})
/* Filter search result message */
const result$ = worker$
.pipe(
filter(isSearchResultMessage),
map(({ data }) => data)
)
/* Create and return component */
return result$
.pipe(
tap(state => push$.next(state)),
finalize(() => push$.complete()),
map(state => ({ ref: el, ...state }))
)
}
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