xref: /webtrees/app/Http/RequestHandlers/AbstractTomSelectHandler.php (revision a6081838ed8b5fd0ed499200d63e496112f9f536) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2021 webtrees development team
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18declare(strict_types=1);
19
20namespace Fisharebest\Webtrees\Http\RequestHandlers;
21
22use Fisharebest\Webtrees\Tree;
23use Fisharebest\Webtrees\Validator;
24use Illuminate\Support\Collection;
25use Psr\Http\Message\ResponseInterface;
26use Psr\Http\Message\ServerRequestInterface;
27use Psr\Http\Server\RequestHandlerInterface;
28
29use function response;
30
31/**
32 * Autocomplete for TomSelect based controls.
33 */
34abstract class AbstractTomSelectHandler implements RequestHandlerInterface
35{
36    // For clients that request one page of data at a time.
37    private const RESULTS_PER_PAGE = 50;
38
39    /**
40     * @param ServerRequestInterface $request
41     *
42     * @return ResponseInterface
43     */
44    public function handle(ServerRequestInterface $request): ResponseInterface
45    {
46        $tree  = Validator::attributes($request)->tree();
47        $at    = Validator::queryParams($request)->isInArray(['', '@'])->string('at');
48        $page  = Validator::queryParams($request)->integer('page', 1);
49        $query = Validator::queryParams($request)->string('query');
50
51        // Fetch one more row than we need, so we can know if more rows exist.
52        $offset = ($page - 1) * self::RESULTS_PER_PAGE;
53        $limit  = self::RESULTS_PER_PAGE + 1;
54
55        // Perform the search.
56        if ($query !== '') {
57            $results = $this->search($tree, $query, $offset, $limit, $at ? '@' : '');
58        } else {
59            $results = new Collection();
60        }
61
62        if ($results->count() > self::RESULTS_PER_PAGE) {
63            $next_url = route(static::class, ['tree' => $tree->name(), 'at' => $at ? '@' : '', 'page' => $page + 1]);
64        } else {
65            $next_url = null;
66        }
67
68        return response([
69            'data'    => $results->slice(0, self::RESULTS_PER_PAGE)->all(),
70            'nextUrl' => $next_url,
71        ]);
72    }
73
74    /**
75     * Perform the search
76     *
77     * @param Tree   $tree
78     * @param string $query
79     * @param int    $offset
80     * @param int    $limit
81     * @param string $at    "@" or ""
82     *
83     * @return Collection<int,array{text:string,value:string}>
84     */
85    abstract protected function search(Tree $tree, string $query, int $offset, int $limit, string $at): Collection;
86}
87