xref: /webtrees/app/Module/RelationshipsChartModule.php (revision 774eb6bada09fdd46a086fd31e84fd157a6351c4) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2023 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\Module;
21
22use Closure;
23use Fig\Http\Message\RequestMethodInterface;
24use Fisharebest\Algorithm\Dijkstra;
25use Fisharebest\Webtrees\Auth;
26use Fisharebest\Webtrees\Contracts\UserInterface;
27use Fisharebest\Webtrees\DB;
28use Fisharebest\Webtrees\FlashMessages;
29use Fisharebest\Webtrees\GedcomRecord;
30use Fisharebest\Webtrees\I18N;
31use Fisharebest\Webtrees\Individual;
32use Fisharebest\Webtrees\Menu;
33use Fisharebest\Webtrees\Registry;
34use Fisharebest\Webtrees\Services\RelationshipService;
35use Fisharebest\Webtrees\Services\TreeService;
36use Fisharebest\Webtrees\Tree;
37use Fisharebest\Webtrees\Validator;
38use Illuminate\Database\Query\JoinClause;
39use Illuminate\Support\Collection;
40use Psr\Http\Message\ResponseInterface;
41use Psr\Http\Message\ServerRequestInterface;
42use Psr\Http\Server\RequestHandlerInterface;
43
44use function array_map;
45use function asset;
46use function count;
47use function current;
48use function e;
49use function implode;
50use function in_array;
51use function max;
52use function min;
53use function next;
54use function ob_get_clean;
55use function ob_start;
56use function preg_match;
57use function redirect;
58use function response;
59use function route;
60use function sort;
61use function view;
62
63/**
64 * Class RelationshipsChartModule
65 */
66class RelationshipsChartModule extends AbstractModule implements ModuleChartInterface, ModuleConfigInterface, RequestHandlerInterface
67{
68    use ModuleChartTrait;
69    use ModuleConfigTrait;
70
71    protected const ROUTE_URL = '/tree/{tree}/relationships-{ancestors}-{recursion}/{xref}{/xref2}';
72
73    /** It would be more correct to use PHP_INT_MAX, but this isn't friendly in URLs */
74    public const UNLIMITED_RECURSION = 99;
75
76    /** By default new trees allow unlimited recursion */
77    public const DEFAULT_RECURSION = '99';
78
79    /** By default new trees search for all relationships (not via ancestors) */
80    public const DEFAULT_ANCESTORS  = '0';
81    public const DEFAULT_PARAMETERS = [
82        'ancestors' => self::DEFAULT_ANCESTORS,
83        'recursion' => self::DEFAULT_RECURSION,
84    ];
85
86    private TreeService $tree_service;
87
88    private RelationshipService $relationship_service;
89
90    /**
91     * @param RelationshipService $relationship_service
92     * @param TreeService         $tree_service
93     */
94    public function __construct(RelationshipService $relationship_service, TreeService $tree_service)
95    {
96        $this->relationship_service = $relationship_service;
97        $this->tree_service         = $tree_service;
98    }
99
100    /**
101     * Initialization.
102     *
103     * @return void
104     */
105    public function boot(): void
106    {
107        Registry::routeFactory()->routeMap()
108            ->get(static::class, static::ROUTE_URL, $this)
109            ->allows(RequestMethodInterface::METHOD_POST)
110            ->tokens([
111                'ancestors' => '\d+',
112                'recursion' => '\d+',
113            ]);
114    }
115
116    public function description(): string
117    {
118        /* I18N: Description of the “RelationshipsChart” module */
119        return I18N::translate('A chart displaying relationships between two individuals.');
120    }
121
122    /**
123     * Return a menu item for this chart - for use in individual boxes.
124     *
125     * @param Individual $individual
126     *
127     * @return Menu|null
128     */
129    public function chartBoxMenu(Individual $individual): Menu|null
130    {
131        return $this->chartMenu($individual);
132    }
133
134    /**
135     * A main menu item for this chart.
136     *
137     * @param Individual $individual
138     *
139     * @return Menu
140     */
141    public function chartMenu(Individual $individual): Menu
142    {
143        $my_xref = $individual->tree()->getUserPreference(Auth::user(), UserInterface::PREF_TREE_ACCOUNT_XREF);
144
145        if ($my_xref !== '' && $my_xref !== $individual->xref()) {
146            $my_record = Registry::individualFactory()->make($my_xref, $individual->tree());
147
148            if ($my_record instanceof Individual) {
149                return new Menu(
150                    I18N::translate('Relationship to me'),
151                    $this->chartUrl($my_record, ['xref2' => $individual->xref()]),
152                    $this->chartMenuClass(),
153                    $this->chartUrlAttributes()
154                );
155            }
156        }
157
158        return new Menu(
159            $this->title(),
160            $this->chartUrl($individual),
161            $this->chartMenuClass(),
162            $this->chartUrlAttributes()
163        );
164    }
165
166    /**
167     * CSS class for the URL.
168     *
169     * @return string
170     */
171    public function chartMenuClass(): string
172    {
173        return 'menu-chart-relationship';
174    }
175
176    /**
177     * How should this module be identified in the control panel, etc.?
178     *
179     * @return string
180     */
181    public function title(): string
182    {
183        /* I18N: Name of a module/chart */
184        return I18N::translate('Relationships');
185    }
186
187    /**
188     * The URL for a page showing chart options.
189     *
190     * @param Individual                                $individual
191     * @param array<bool|int|string|array<string>|null> $parameters
192     *
193     * @return string
194     */
195    public function chartUrl(Individual $individual, array $parameters = []): string
196    {
197        return route(static::class, [
198                'xref' => $individual->xref(),
199                'tree' => $individual->tree()->name(),
200            ] + $parameters + self::DEFAULT_PARAMETERS);
201    }
202
203    /**
204     * @param ServerRequestInterface $request
205     *
206     * @return ResponseInterface
207     */
208    public function handle(ServerRequestInterface $request): ResponseInterface
209    {
210        $tree      = Validator::attributes($request)->tree();
211        $xref      = Validator::attributes($request)->isXref()->string('xref');
212        $xref2     = Validator::attributes($request)->isXref()->string('xref2', '');
213        $ajax      = Validator::queryParams($request)->boolean('ajax', false);
214        $ancestors = (int) $request->getAttribute('ancestors');
215        $recursion = (int) $request->getAttribute('recursion');
216        $user      = Validator::attributes($request)->user();
217
218        // Convert POST requests into GET requests for pretty URLs.
219        if ($request->getMethod() === RequestMethodInterface::METHOD_POST) {
220            return redirect(route(static::class, [
221                'tree'      => $tree->name(),
222                'ancestors' => Validator::parsedBody($request)->string('ancestors', ''),
223                'recursion' => Validator::parsedBody($request)->string('recursion', ''),
224                'xref'      => Validator::parsedBody($request)->string('xref', ''),
225                'xref2'     => Validator::parsedBody($request)->string('xref2', ''),
226            ]));
227        }
228
229        $individual1 = Registry::individualFactory()->make($xref, $tree);
230        $individual2 = Registry::individualFactory()->make($xref2, $tree);
231
232        $ancestors_only = (int) $tree->getPreference('RELATIONSHIP_ANCESTORS', static::DEFAULT_ANCESTORS);
233        $max_recursion  = (int) $tree->getPreference('RELATIONSHIP_RECURSION', static::DEFAULT_RECURSION);
234
235        $recursion = min($recursion, $max_recursion);
236
237        Auth::checkComponentAccess($this, ModuleChartInterface::class, $tree, $user);
238
239        if ($individual1 instanceof Individual) {
240            $individual1 = Auth::checkIndividualAccess($individual1, false, true);
241        }
242
243        if ($individual2 instanceof Individual) {
244            $individual2 = Auth::checkIndividualAccess($individual2, false, true);
245        }
246
247        if ($individual1 instanceof Individual && $individual2 instanceof Individual) {
248            if ($ajax) {
249                return $this->chart($individual1, $individual2, $recursion, $ancestors);
250            }
251
252            /* I18N: %s are individual’s names */
253            $title    = I18N::translate('Relationships between %1$s and %2$s', $individual1->fullName(), $individual2->fullName());
254            $ajax_url = $this->chartUrl($individual1, [
255                'ajax'      => true,
256                'ancestors' => $ancestors,
257                'recursion' => $recursion,
258                'xref2'     => $individual2->xref(),
259            ]);
260        } else {
261            $title    = I18N::translate('Relationships');
262            $ajax_url = '';
263        }
264
265        return $this->viewResponse('modules/relationships-chart/page', [
266            'ajax_url'          => $ajax_url,
267            'ancestors'         => $ancestors,
268            'ancestors_only'    => $ancestors_only,
269            'ancestors_options' => $this->ancestorsOptions(),
270            'individual1'       => $individual1,
271            'individual2'       => $individual2,
272            'max_recursion'     => $max_recursion,
273            'module'            => $this->name(),
274            'recursion'         => $recursion,
275            'recursion_options' => $this->recursionOptions($max_recursion),
276            'title'             => $title,
277            'tree'              => $tree,
278        ]);
279    }
280
281    /**
282     * @param Individual $individual1
283     * @param Individual $individual2
284     * @param int        $recursion
285     * @param int        $ancestors
286     *
287     * @return ResponseInterface
288     */
289    public function chart(Individual $individual1, Individual $individual2, int $recursion, int $ancestors): ResponseInterface
290    {
291        $tree = $individual1->tree();
292
293        $max_recursion = (int) $tree->getPreference('RELATIONSHIP_RECURSION', static::DEFAULT_RECURSION);
294
295        $recursion = min($recursion, $max_recursion);
296
297        $paths = $this->calculateRelationships($individual1, $individual2, $recursion, (bool) $ancestors);
298
299        ob_start();
300        if (I18N::direction() === 'ltr') {
301            $diagonal1 = asset('css/images/dline.png');
302            $diagonal2 = asset('css/images/dline2.png');
303        } else {
304            $diagonal1 = asset('css/images/dline2.png');
305            $diagonal2 = asset('css/images/dline.png');
306        }
307
308        $num_paths = 0;
309        foreach ($paths as $path) {
310            // Extract the relationship names between pairs of individuals
311            $relationships = $this->oldStyleRelationshipPath($tree, $path);
312            if ($relationships === []) {
313                // Cannot see one of the families/individuals, due to privacy;
314                continue;
315            }
316
317            $nodes = Collection::make($path)
318                ->map(static function (string $xref, int $key) use ($tree): GedcomRecord {
319                    if ($key % 2 === 0) {
320                        return Registry::individualFactory()->make($xref, $tree);
321                    }
322
323                    return  Registry::familyFactory()->make($xref, $tree);
324                });
325
326            $relationship = $this->relationship_service->nameFromPath($nodes->all(), I18N::language());
327
328            echo '<h3>', I18N::translate('Relationship: %s', $relationship), '</h3>';
329
330            $num_paths++;
331
332            // Use a table/grid for layout.
333            $table = [];
334            // Current position in the grid.
335            $x = 0;
336            $y = 0;
337            // Extent of the grid.
338            $min_y = 0;
339            $max_y = 0;
340            $max_x = 0;
341            // For each node in the path.
342            foreach ($path as $n => $xref) {
343                if ($n % 2 === 1) {
344                    switch ($relationships[$n]) {
345                        case 'hus':
346                        case 'wif':
347                        case 'spo':
348                        case 'bro':
349                        case 'sis':
350                        case 'sib':
351                            $table[$x + 1][$y] = '<div style="background:url(' . e(asset('css/images/hline.png')) . ') repeat-x center;  width: 94px; text-align: center"><div style="height: 32px;">' . $this->relationship_service->legacyNameAlgorithm($relationships[$n], Registry::individualFactory()->make($path[$n - 1], $tree), Registry::individualFactory()->make($path[$n + 1], $tree)) . '</div><div style="height: 32px;">' . view('icons/arrow-right') . '</div></div>';
352                            $x += 2;
353                            break;
354                        case 'son':
355                        case 'dau':
356                        case 'chi':
357                            if ($n > 2 && preg_match('/fat|mot|par/', $relationships[$n - 2])) {
358                                $table[$x + 1][$y - 1] = '<div style="background:url(' . $diagonal2 . '); width: 64px; height: 64px; text-align: center;"><div style="height: 32px; text-align: end;">' . $this->relationship_service->legacyNameAlgorithm($relationships[$n], Registry::individualFactory()->make($path[$n - 1], $tree), Registry::individualFactory()->make($path[$n + 1], $tree)) . '</div><div style="height: 32px; text-align: start;">' . view('icons/arrow-down') . '</div></div>';
359                                $x += 2;
360                            } else {
361                                $table[$x][$y - 1] = '<div style="background:url(' . e('"' . asset('css/images/vline.png') . '"') . ') repeat-y center; height: 64px; text-align: center;"><div style="display: inline-block; width:50%; line-height: 64px;">' . $this->relationship_service->legacyNameAlgorithm($relationships[$n], Registry::individualFactory()->make($path[$n - 1], $tree), Registry::individualFactory()->make($path[$n + 1], $tree)) . '</div><div style="display: inline-block; width:50%; line-height: 64px;">' . view('icons/arrow-down') . '</div></div>';
362                            }
363                            $y -= 2;
364                            break;
365                        case 'fat':
366                        case 'mot':
367                        case 'par':
368                            if ($n > 2 && preg_match('/son|dau|chi/', $relationships[$n - 2])) {
369                                $table[$x + 1][$y + 1] = '<div style="background:url(' . $diagonal1 . '); background-position: top right; width: 64px; height: 64px; text-align: center;"><div style="height: 32px; text-align: start;">' . $this->relationship_service->legacyNameAlgorithm($relationships[$n], Registry::individualFactory()->make($path[$n - 1], $tree), Registry::individualFactory()->make($path[$n + 1], $tree)) . '</div><div style="height: 32px; text-align: end;">' . view('icons/arrow-down') . '</div></div>';
370                                $x += 2;
371                            } else {
372                                $table[$x][$y + 1] = '<div style="background:url(' . e('"' . asset('css/images/vline.png') . '"') . ') repeat-y center; height: 64px; text-align:center; "><div style="display: inline-block; width: 50%; line-height: 64px;">' . $this->relationship_service->legacyNameAlgorithm($relationships[$n], Registry::individualFactory()->make($path[$n - 1], $tree), Registry::individualFactory()->make($path[$n + 1], $tree)) . '</div><div style="display: inline-block; width: 50%; line-height: 32px">' . view('icons/arrow-up') . '</div></div>';
373                            }
374                            $y += 2;
375                            break;
376                    }
377                    $max_x = max($max_x, $x);
378                    $min_y = min($min_y, $y);
379                    $max_y = max($max_y, $y);
380                } else {
381                    $individual    = Registry::individualFactory()->make($xref, $tree);
382                    $table[$x][$y] = view('chart-box', ['individual' => $individual]);
383                }
384            }
385            echo '<div class="wt-chart wt-chart-relationships">';
386            echo '<table style="border-collapse: collapse; margin: 20px 50px;">';
387            for ($y = $max_y; $y >= $min_y; --$y) {
388                echo '<tr>';
389                for ($x = 0; $x <= $max_x; ++$x) {
390                    echo '<td style="padding: 0;">';
391                    if (isset($table[$x][$y])) {
392                        echo $table[$x][$y];
393                    }
394                    echo '</td>';
395                }
396                echo '</tr>';
397            }
398            echo '</table>';
399            echo '</div>';
400        }
401
402        if (!$num_paths) {
403            echo '<p>', I18N::translate('No link between the two individuals could be found.'), '</p>';
404        }
405
406        $html = ob_get_clean();
407
408        return response($html);
409    }
410
411    /**
412     * @param ServerRequestInterface $request
413     *
414     * @return ResponseInterface
415     */
416    public function getAdminAction(ServerRequestInterface $request): ResponseInterface
417    {
418        $this->layout = 'layouts/administration';
419
420        return $this->viewResponse('modules/relationships-chart/config', [
421            'all_trees'         => $this->tree_service->all(),
422            'ancestors_options' => $this->ancestorsOptions(),
423            'default_ancestors' => self::DEFAULT_ANCESTORS,
424            'default_recursion' => self::DEFAULT_RECURSION,
425            'recursion_options' => $this->recursionConfigOptions(),
426            'title'             => I18N::translate('Chart preferences') . ' — ' . $this->title(),
427        ]);
428    }
429
430    /**
431     * @param ServerRequestInterface $request
432     *
433     * @return ResponseInterface
434     */
435    public function postAdminAction(ServerRequestInterface $request): ResponseInterface
436    {
437        foreach ($this->tree_service->all() as $tree) {
438            $recursion = Validator::parsedBody($request)->integer('relationship-recursion-' . $tree->id());
439            $ancestors = Validator::parsedBody($request)->string('relationship-ancestors-' . $tree->id());
440
441            $tree->setPreference('RELATIONSHIP_RECURSION', (string) $recursion);
442            $tree->setPreference('RELATIONSHIP_ANCESTORS', $ancestors);
443        }
444
445        FlashMessages::addMessage(I18N::translate('The preferences for the module “%s” have been updated.', $this->title()), 'success');
446
447        return redirect($this->getConfigLink());
448    }
449
450    /**
451     * Possible options for the ancestors option
452     *
453     * @return array<int,string>
454     */
455    private function ancestorsOptions(): array
456    {
457        return [
458            0 => I18N::translate('Find any relationship'),
459            1 => I18N::translate('Find relationships via ancestors'),
460        ];
461    }
462
463    /**
464     * Possible options for the recursion option
465     *
466     * @return array<int,string>
467     */
468    private function recursionConfigOptions(): array
469    {
470        return [
471            0                         => I18N::translate('none'),
472            1                         => I18N::number(1),
473            2                         => I18N::number(2),
474            3                         => I18N::number(3),
475            self::UNLIMITED_RECURSION => I18N::translate('unlimited'),
476        ];
477    }
478
479    /**
480     * Calculate the shortest paths - or all paths - between two individuals.
481     *
482     * @param Individual $individual1
483     * @param Individual $individual2
484     * @param int        $recursion How many levels of recursion to use
485     * @param bool       $ancestor  Restrict to relationships via a common ancestor
486     *
487     * @return array<array<string>>
488     */
489    private function calculateRelationships(
490        Individual $individual1,
491        Individual $individual2,
492        int $recursion,
493        bool $ancestor = false
494    ): array {
495        $tree = $individual1->tree();
496
497        $rows = DB::table('link')
498            ->where('l_file', '=', $tree->id())
499            ->whereIn('l_type', ['FAMS', 'FAMC'])
500            ->select(['l_from', 'l_to'])
501            ->get();
502
503        // Optionally restrict the graph to the ancestors of the individuals.
504        if ($ancestor) {
505            $ancestors = $this->allAncestors($individual1->xref(), $individual2->xref(), $tree->id());
506            $exclude   = $this->excludeFamilies($individual1->xref(), $individual2->xref(), $tree->id());
507        } else {
508            $ancestors = [];
509            $exclude   = [];
510        }
511
512        $graph = [];
513
514        foreach ($rows as $row) {
515            if ($ancestors === [] || in_array($row->l_from, $ancestors, true) && !in_array($row->l_to, $exclude, true)) {
516                $graph[$row->l_from][$row->l_to] = 1;
517                $graph[$row->l_to][$row->l_from] = 1;
518            }
519        }
520
521        $xref1    = $individual1->xref();
522        $xref2    = $individual2->xref();
523        $dijkstra = new Dijkstra($graph);
524        $paths    = $dijkstra->shortestPaths($xref1, $xref2);
525
526        // Only process each exclusion list once;
527        $excluded = [];
528
529        $queue = [];
530        foreach ($paths as $path) {
531            // Insert the paths into the queue, with an exclusion list.
532            $queue[] = [
533                'path'    => $path,
534                'exclude' => [],
535            ];
536            // While there are un-extended paths
537            for ($next = current($queue); $next !== false; $next = next($queue)) {
538                // For each family on the path
539                for ($n = count($next['path']) - 2; $n >= 1; $n -= 2) {
540                    $exclude = $next['exclude'];
541                    if (count($exclude) >= $recursion) {
542                        continue;
543                    }
544                    $exclude[] = $next['path'][$n];
545                    sort($exclude);
546                    $tmp = implode('-', $exclude);
547                    if (in_array($tmp, $excluded, true)) {
548                        continue;
549                    }
550
551                    $excluded[] = $tmp;
552                    // Add any new path to the queue
553                    foreach ($dijkstra->shortestPaths($xref1, $xref2, $exclude) as $new_path) {
554                        $queue[] = [
555                            'path'    => $new_path,
556                            'exclude' => $exclude,
557                        ];
558                    }
559                }
560            }
561        }
562        // Extract the paths from the queue.
563        $paths = [];
564        foreach ($queue as $next) {
565            // The Dijkstra library does not use strict types, and converts
566            // numeric array keys (XREFs) from strings to integers;
567            $path = array_map($this->stringMapper(), $next['path']);
568
569            // Remove duplicates
570            $paths[implode('-', $next['path'])] = $path;
571        }
572
573        return $paths;
574    }
575
576    /**
577     * Convert numeric values to strings
578     *
579     * @return Closure(int|string):string
580     */
581    private function stringMapper(): Closure
582    {
583        return static fn ($xref) => (string) $xref;
584    }
585
586    /**
587     * Find all ancestors of a list of individuals
588     *
589     * @param string $xref1
590     * @param string $xref2
591     * @param int    $tree_id
592     *
593     * @return array<string>
594     */
595    private function allAncestors(string $xref1, string $xref2, int $tree_id): array
596    {
597        $ancestors = [
598            $xref1,
599            $xref2,
600        ];
601
602        $queue = [
603            $xref1,
604            $xref2,
605        ];
606        while ($queue !== []) {
607            $parents = DB::table('link AS l1')
608                ->join('link AS l2', static function (JoinClause $join): void {
609                    $join
610                        ->on('l1.l_to', '=', 'l2.l_to')
611                        ->on('l1.l_file', '=', 'l2.l_file');
612                })
613                ->where('l1.l_file', '=', $tree_id)
614                ->where('l1.l_type', '=', 'FAMC')
615                ->where('l2.l_type', '=', 'FAMS')
616                ->whereIn('l1.l_from', $queue)
617                ->pluck('l2.l_from');
618
619            $queue = [];
620            foreach ($parents as $parent) {
621                if (!in_array($parent, $ancestors, true)) {
622                    $ancestors[] = $parent;
623                    $queue[]     = $parent;
624                }
625            }
626        }
627
628        return $ancestors;
629    }
630
631    /**
632     * Find all families of two individuals
633     *
634     * @param string $xref1
635     * @param string $xref2
636     * @param int    $tree_id
637     *
638     * @return array<string>
639     */
640    private function excludeFamilies(string $xref1, string $xref2, int $tree_id): array
641    {
642        return DB::table('link AS l1')
643            ->join('link AS l2', static function (JoinClause $join): void {
644                $join
645                    ->on('l1.l_to', '=', 'l2.l_to')
646                    ->on('l1.l_type', '=', 'l2.l_type')
647                    ->on('l1.l_file', '=', 'l2.l_file');
648            })
649            ->where('l1.l_file', '=', $tree_id)
650            ->where('l1.l_type', '=', 'FAMS')
651            ->where('l1.l_from', '=', $xref1)
652            ->where('l2.l_from', '=', $xref2)
653            ->pluck('l1.l_to')
654            ->all();
655    }
656
657    /**
658     * Convert a path (list of XREFs) to an "old-style" string of relationships.
659     * Return an empty array, if privacy rules prevent us viewing any node.
660     *
661     * @param Tree          $tree
662     * @param array<string> $path Alternately Individual / Family
663     *
664     * @return array<string>
665     */
666    private function oldStyleRelationshipPath(Tree $tree, array $path): array
667    {
668        $spouse_codes = [
669            'M' => 'hus',
670            'F' => 'wif',
671            'U' => 'spo',
672        ];
673        $parent_codes = [
674            'M' => 'fat',
675            'F' => 'mot',
676            'U' => 'par',
677        ];
678        $child_codes = [
679            'M' => 'son',
680            'F' => 'dau',
681            'U' => 'chi',
682        ];
683        $sibling_codes = [
684            'M' => 'bro',
685            'F' => 'sis',
686            'U' => 'sib',
687        ];
688        $relationships = [];
689
690        for ($i = 1, $count = count($path); $i < $count; $i += 2) {
691            $family = Registry::familyFactory()->make($path[$i], $tree);
692            $prev   = Registry::individualFactory()->make($path[$i - 1], $tree);
693            $next   = Registry::individualFactory()->make($path[$i + 1], $tree);
694            if (preg_match('/\n\d (HUSB|WIFE|CHIL) @' . $prev->xref() . '@/', $family->gedcom(), $match)) {
695                $rel1 = $match[1];
696            } else {
697                return [];
698            }
699            if (preg_match('/\n\d (HUSB|WIFE|CHIL) @' . $next->xref() . '@/', $family->gedcom(), $match)) {
700                $rel2 = $match[1];
701            } else {
702                return [];
703            }
704            if (($rel1 === 'HUSB' || $rel1 === 'WIFE') && ($rel2 === 'HUSB' || $rel2 === 'WIFE')) {
705                $relationships[$i] = $spouse_codes[$next->sex()] ?? $spouse_codes['U'];
706            } elseif (($rel1 === 'HUSB' || $rel1 === 'WIFE') && $rel2 === 'CHIL') {
707                $relationships[$i] = $child_codes[$next->sex()] ?? $child_codes['U'];
708            } elseif ($rel1 === 'CHIL' && ($rel2 === 'HUSB' || $rel2 === 'WIFE')) {
709                $relationships[$i] = $parent_codes[$next->sex()] ?? $parent_codes['U'];
710            } elseif ($rel1 === 'CHIL' && $rel2 === 'CHIL') {
711                $relationships[$i] = $sibling_codes[$next->sex()] ?? $sibling_codes['U'];
712            }
713        }
714
715        return $relationships;
716    }
717
718    /**
719     * Possible options for the recursion option
720     *
721     * @param int $max_recursion
722     *
723     * @return array<string>
724     */
725    private function recursionOptions(int $max_recursion): array
726    {
727        if ($max_recursion === static::UNLIMITED_RECURSION) {
728            $text = I18N::translate('Find all possible relationships');
729        } else {
730            $text = I18N::translate('Find other relationships');
731        }
732
733        return [
734            '0'            => I18N::translate('Find the closest relationships'),
735            $max_recursion => $text,
736        ];
737    }
738}
739