xref: /webtrees/app/Module/RelationshipsChartModule.php (revision 28d026ad36e53e5af3ffb5b483ee815e04b18ecf) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2022 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\FlashMessages;
28use Fisharebest\Webtrees\GedcomRecord;
29use Fisharebest\Webtrees\I18N;
30use Fisharebest\Webtrees\Individual;
31use Fisharebest\Webtrees\Menu;
32use Fisharebest\Webtrees\Registry;
33use Fisharebest\Webtrees\Services\ModuleService;
34use Fisharebest\Webtrees\Services\RelationshipService;
35use Fisharebest\Webtrees\Services\TreeService;
36use Fisharebest\Webtrees\Tree;
37use Fisharebest\Webtrees\Validator;
38use Illuminate\Database\Capsule\Manager as DB;
39use Illuminate\Database\Query\JoinClause;
40use Illuminate\Support\Collection;
41use Psr\Http\Message\ResponseInterface;
42use Psr\Http\Message\ServerRequestInterface;
43use Psr\Http\Server\RequestHandlerInterface;
44
45use function count;
46use function in_array;
47use function redirect;
48use function route;
49use function view;
50
51/**
52 * Class RelationshipsChartModule
53 */
54class RelationshipsChartModule extends AbstractModule implements ModuleChartInterface, ModuleConfigInterface, RequestHandlerInterface
55{
56    use ModuleChartTrait;
57    use ModuleConfigTrait;
58
59    protected const ROUTE_URL = '/tree/{tree}/relationships-{ancestors}-{recursion}/{xref}{/xref2}';
60
61    /** It would be more correct to use PHP_INT_MAX, but this isn't friendly in URLs */
62    public const UNLIMITED_RECURSION = 99;
63
64    /** By default new trees allow unlimited recursion */
65    public const DEFAULT_RECURSION = '99';
66
67    /** By default new trees search for all relationships (not via ancestors) */
68    public const DEFAULT_ANCESTORS  = '0';
69    public const DEFAULT_PARAMETERS = [
70        'ancestors' => self::DEFAULT_ANCESTORS,
71        'recursion' => self::DEFAULT_RECURSION,
72    ];
73
74    private ModuleService $module_service;
75
76    private TreeService $tree_service;
77
78    private RelationshipService $relationship_service;
79
80    /**
81     * @param ModuleService       $module_service
82     * @param RelationshipService $relationship_service
83     * @param TreeService         $tree_service
84     */
85    public function __construct(ModuleService $module_service, RelationshipService $relationship_service, TreeService $tree_service)
86    {
87        $this->module_service       = $module_service;
88        $this->relationship_service = $relationship_service;
89        $this->tree_service         = $tree_service;
90    }
91
92    /**
93     * Initialization.
94     *
95     * @return void
96     */
97    public function boot(): void
98    {
99        Registry::routeFactory()->routeMap()
100            ->get(static::class, static::ROUTE_URL, $this)
101            ->allows(RequestMethodInterface::METHOD_POST)
102            ->tokens([
103                'ancestors' => '\d+',
104                'recursion' => '\d+',
105            ]);
106    }
107
108    /**
109     * A sentence describing what this module does.
110     *
111     * @return string
112     */
113    public function description(): string
114    {
115        /* I18N: Description of the “RelationshipsChart” module */
116        return I18N::translate('A chart displaying relationships between two individuals.');
117    }
118
119    /**
120     * Return a menu item for this chart - for use in individual boxes.
121     *
122     * @param Individual $individual
123     *
124     * @return Menu|null
125     */
126    public function chartBoxMenu(Individual $individual): ?Menu
127    {
128        return $this->chartMenu($individual);
129    }
130
131    /**
132     * A main menu item for this chart.
133     *
134     * @param Individual $individual
135     *
136     * @return Menu
137     */
138    public function chartMenu(Individual $individual): Menu
139    {
140        $my_xref = $individual->tree()->getUserPreference(Auth::user(), UserInterface::PREF_TREE_ACCOUNT_XREF);
141
142        if ($my_xref !== '' && $my_xref !== $individual->xref()) {
143            $my_record = Registry::individualFactory()->make($my_xref, $individual->tree());
144
145            if ($my_record instanceof Individual) {
146                return new Menu(
147                    I18N::translate('Relationship to me'),
148                    $this->chartUrl($my_record, ['xref2' => $individual->xref()]),
149                    $this->chartMenuClass(),
150                    $this->chartUrlAttributes()
151                );
152            }
153        }
154
155        return new Menu(
156            $this->title(),
157            $this->chartUrl($individual),
158            $this->chartMenuClass(),
159            $this->chartUrlAttributes()
160        );
161    }
162
163    /**
164     * CSS class for the URL.
165     *
166     * @return string
167     */
168    public function chartMenuClass(): string
169    {
170        return 'menu-chart-relationship';
171    }
172
173    /**
174     * How should this module be identified in the control panel, etc.?
175     *
176     * @return string
177     */
178    public function title(): string
179    {
180        /* I18N: Name of a module/chart */
181        return I18N::translate('Relationships');
182    }
183
184    /**
185     * The URL for a page showing chart options.
186     *
187     * @param Individual                                $individual
188     * @param array<bool|int|string|array<string>|null> $parameters
189     *
190     * @return string
191     */
192    public function chartUrl(Individual $individual, array $parameters = []): string
193    {
194        return route(static::class, [
195                'xref' => $individual->xref(),
196                'tree' => $individual->tree()->name(),
197            ] + $parameters + self::DEFAULT_PARAMETERS);
198    }
199
200    /**
201     * @param ServerRequestInterface $request
202     *
203     * @return ResponseInterface
204     */
205    public function handle(ServerRequestInterface $request): ResponseInterface
206    {
207        $tree      = Validator::attributes($request)->tree();
208        $xref      = Validator::attributes($request)->isXref()->string('xref');
209        $xref2     = Validator::attributes($request)->isXref()->string('xref2', '');
210        $ajax      = Validator::queryParams($request)->boolean('ajax', false);
211        $ancestors = (int) $request->getAttribute('ancestors');
212        $recursion = (int) $request->getAttribute('recursion');
213        $user      = Validator::attributes($request)->user();
214
215        // Convert POST requests into GET requests for pretty URLs.
216        if ($request->getMethod() === RequestMethodInterface::METHOD_POST) {
217            return redirect(route(static::class, [
218                'tree'      => $tree->name(),
219                'ancestors' => Validator::parsedBody($request)->string('ancestors', ''),
220                'recursion' => Validator::parsedBody($request)->string('recursion', ''),
221                'xref'      => Validator::parsedBody($request)->string('xref', ''),
222                'xref2'     => Validator::parsedBody($request)->string('xref2', ''),
223            ]));
224        }
225
226        $individual1 = Registry::individualFactory()->make($xref, $tree);
227        $individual2 = Registry::individualFactory()->make($xref2, $tree);
228
229        $ancestors_only = (int) $tree->getPreference('RELATIONSHIP_ANCESTORS', static::DEFAULT_ANCESTORS);
230        $max_recursion  = (int) $tree->getPreference('RELATIONSHIP_RECURSION', static::DEFAULT_RECURSION);
231
232        $recursion = min($recursion, $max_recursion);
233
234        Auth::checkComponentAccess($this, ModuleChartInterface::class, $tree, $user);
235
236        if ($individual1 instanceof Individual) {
237            $individual1 = Auth::checkIndividualAccess($individual1, false, true);
238        }
239
240        if ($individual2 instanceof Individual) {
241            $individual2 = Auth::checkIndividualAccess($individual2, false, true);
242        }
243
244        if ($individual1 instanceof Individual && $individual2 instanceof Individual) {
245            if ($ajax) {
246                return $this->chart($individual1, $individual2, $recursion, $ancestors);
247            }
248
249            /* I18N: %s are individual’s names */
250            $title    = I18N::translate('Relationships between %1$s and %2$s', $individual1->fullName(), $individual2->fullName());
251            $ajax_url = $this->chartUrl($individual1, [
252                'ajax'      => true,
253                'ancestors' => $ancestors,
254                'recursion' => $recursion,
255                'xref2'     => $individual2->xref(),
256            ]);
257        } else {
258            $title    = I18N::translate('Relationships');
259            $ajax_url = '';
260        }
261
262        return $this->viewResponse('modules/relationships-chart/page', [
263            'ajax_url'          => $ajax_url,
264            'ancestors'         => $ancestors,
265            'ancestors_only'    => $ancestors_only,
266            'ancestors_options' => $this->ancestorsOptions(),
267            'individual1'       => $individual1,
268            'individual2'       => $individual2,
269            'max_recursion'     => $max_recursion,
270            'module'            => $this->name(),
271            'recursion'         => $recursion,
272            'recursion_options' => $this->recursionOptions($max_recursion),
273            'title'             => $title,
274            'tree'              => $tree,
275        ]);
276    }
277
278    /**
279     * @param Individual $individual1
280     * @param Individual $individual2
281     * @param int        $recursion
282     * @param int        $ancestors
283     *
284     * @return ResponseInterface
285     */
286    public function chart(Individual $individual1, Individual $individual2, int $recursion, int $ancestors): ResponseInterface
287    {
288        $tree = $individual1->tree();
289
290        $max_recursion = (int) $tree->getPreference('RELATIONSHIP_RECURSION', static::DEFAULT_RECURSION);
291
292        $recursion = min($recursion, $max_recursion);
293
294        $paths = $this->calculateRelationships($individual1, $individual2, $recursion, (bool) $ancestors);
295
296        ob_start();
297        if (I18N::direction() === 'ltr') {
298            $diagonal1 = asset('css/images/dline.png');
299            $diagonal2 = asset('css/images/dline2.png');
300        } else {
301            $diagonal1 = asset('css/images/dline2.png');
302            $diagonal2 = asset('css/images/dline.png');
303        }
304
305        $num_paths = 0;
306        foreach ($paths as $path) {
307            // Extract the relationship names between pairs of individuals
308            $relationships = $this->oldStyleRelationshipPath($tree, $path);
309            if ($relationships === []) {
310                // Cannot see one of the families/individuals, due to privacy;
311                continue;
312            }
313
314            $nodes = Collection::make($path)
315                ->map(static function (string $xref, int $key) use ($tree): GedcomRecord {
316                    if ($key % 2 === 0) {
317                        return Registry::individualFactory()->make($xref, $tree);
318                    }
319
320                    return  Registry::familyFactory()->make($xref, $tree);
321                });
322
323            $language = $this->module_service
324                ->findByInterface(ModuleLanguageInterface::class, true)
325                ->first(fn (ModuleLanguageInterface $language): bool => $language->locale()->languageTag() === I18N::languageTag());
326
327            echo '<h3>', I18N::translate('Relationship: %s', $this->relationship_service->nameFromPath($nodes->all(), $language)), '</h3>';
328            $num_paths++;
329
330            // Use a table/grid for layout.
331            $table = [];
332            // Current position in the grid.
333            $x = 0;
334            $y = 0;
335            // Extent of the grid.
336            $min_y = 0;
337            $max_y = 0;
338            $max_x = 0;
339            // For each node in the path.
340            foreach ($path as $n => $xref) {
341                if ($n % 2 === 1) {
342                    switch ($relationships[$n]) {
343                        case 'hus':
344                        case 'wif':
345                        case 'spo':
346                        case 'bro':
347                        case 'sis':
348                        case 'sib':
349                            $table[$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>';
350                            $x += 2;
351                            break;
352                        case 'son':
353                        case 'dau':
354                        case 'chi':
355                            if ($n > 2 && preg_match('/fat|mot|par/', $relationships[$n - 2])) {
356                                $table[$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>';
357                                $x += 2;
358                            } else {
359                                $table[$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>';
360                            }
361                            $y -= 2;
362                            break;
363                        case 'fat':
364                        case 'mot':
365                        case 'par':
366                            if ($n > 2 && preg_match('/son|dau|chi/', $relationships[$n - 2])) {
367                                $table[$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>';
368                                $x += 2;
369                            } else {
370                                $table[$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>';
371                            }
372                            $y += 2;
373                            break;
374                    }
375                    $max_x = max($max_x, $x);
376                    $min_y = min($min_y, $y);
377                    $max_y = max($max_y, $y);
378                } else {
379                    $individual    = Registry::individualFactory()->make($xref, $tree);
380                    $table[$x][$y] = view('chart-box', ['individual' => $individual]);
381                }
382            }
383            echo '<div class="wt-chart wt-chart-relationships">';
384            echo '<table style="border-collapse: collapse; margin: 20px 50px;">';
385            for ($y = $max_y; $y >= $min_y; --$y) {
386                echo '<tr>';
387                for ($x = 0; $x <= $max_x; ++$x) {
388                    echo '<td style="padding: 0;">';
389                    if (isset($table[$x][$y])) {
390                        echo $table[$x][$y];
391                    }
392                    echo '</td>';
393                }
394                echo '</tr>';
395            }
396            echo '</table>';
397            echo '</div>';
398        }
399
400        if (!$num_paths) {
401            echo '<p>', I18N::translate('No link between the two individuals could be found.'), '</p>';
402        }
403
404        $html = ob_get_clean();
405
406        return response($html);
407    }
408
409    /**
410     * @param ServerRequestInterface $request
411     *
412     * @return ResponseInterface
413     */
414    public function getAdminAction(ServerRequestInterface $request): ResponseInterface
415    {
416        $this->layout = 'layouts/administration';
417
418        return $this->viewResponse('modules/relationships-chart/config', [
419            'all_trees'         => $this->tree_service->all(),
420            'ancestors_options' => $this->ancestorsOptions(),
421            'default_ancestors' => self::DEFAULT_ANCESTORS,
422            'default_recursion' => self::DEFAULT_RECURSION,
423            'recursion_options' => $this->recursionConfigOptions(),
424            'title'             => I18N::translate('Chart preferences') . ' — ' . $this->title(),
425        ]);
426    }
427
428    /**
429     * @param ServerRequestInterface $request
430     *
431     * @return ResponseInterface
432     */
433    public function postAdminAction(ServerRequestInterface $request): ResponseInterface
434    {
435        foreach ($this->tree_service->all() as $tree) {
436            $recursion = Validator::parsedBody($request)->integer('relationship-recursion-' . $tree->id());
437            $ancestors = Validator::parsedBody($request)->string('relationship-ancestors-' . $tree->id());
438
439            $tree->setPreference('RELATIONSHIP_RECURSION', (string) $recursion);
440            $tree->setPreference('RELATIONSHIP_ANCESTORS', $ancestors);
441        }
442
443        FlashMessages::addMessage(I18N::translate('The preferences for the module “%s” have been updated.', $this->title()), 'success');
444
445        return redirect($this->getConfigLink());
446    }
447
448    /**
449     * Possible options for the ancestors option
450     *
451     * @return array<int,string>
452     */
453    private function ancestorsOptions(): array
454    {
455        return [
456            0 => I18N::translate('Find any relationship'),
457            1 => I18N::translate('Find relationships via ancestors'),
458        ];
459    }
460
461    /**
462     * Possible options for the recursion option
463     *
464     * @return array<int,string>
465     */
466    private function recursionConfigOptions(): array
467    {
468        return [
469            0                         => I18N::translate('none'),
470            1                         => I18N::number(1),
471            2                         => I18N::number(2),
472            3                         => I18N::number(3),
473            self::UNLIMITED_RECURSION => I18N::translate('unlimited'),
474        ];
475    }
476
477    /**
478     * Calculate the shortest paths - or all paths - between two individuals.
479     *
480     * @param Individual $individual1
481     * @param Individual $individual2
482     * @param int        $recursion How many levels of recursion to use
483     * @param bool       $ancestor  Restrict to relationships via a common ancestor
484     *
485     * @return array<array<string>>
486     */
487    private function calculateRelationships(
488        Individual $individual1,
489        Individual $individual2,
490        int $recursion,
491        bool $ancestor = false
492    ): array {
493        $tree = $individual1->tree();
494
495        $rows = DB::table('link')
496            ->where('l_file', '=', $tree->id())
497            ->whereIn('l_type', ['FAMS', 'FAMC'])
498            ->select(['l_from', 'l_to'])
499            ->get();
500
501        // Optionally restrict the graph to the ancestors of the individuals.
502        if ($ancestor) {
503            $ancestors = $this->allAncestors($individual1->xref(), $individual2->xref(), $tree->id());
504            $exclude   = $this->excludeFamilies($individual1->xref(), $individual2->xref(), $tree->id());
505        } else {
506            $ancestors = [];
507            $exclude   = [];
508        }
509
510        $graph = [];
511
512        foreach ($rows as $row) {
513            if ($ancestors === [] || in_array($row->l_from, $ancestors, true) && !in_array($row->l_to, $exclude, true)) {
514                $graph[$row->l_from][$row->l_to] = 1;
515                $graph[$row->l_to][$row->l_from] = 1;
516            }
517        }
518
519        $xref1    = $individual1->xref();
520        $xref2    = $individual2->xref();
521        $dijkstra = new Dijkstra($graph);
522        $paths    = $dijkstra->shortestPaths($xref1, $xref2);
523
524        // Only process each exclusion list once;
525        $excluded = [];
526
527        $queue = [];
528        foreach ($paths as $path) {
529            // Insert the paths into the queue, with an exclusion list.
530            $queue[] = [
531                'path'    => $path,
532                'exclude' => [],
533            ];
534            // While there are un-extended paths
535            for ($next = current($queue); $next !== false; $next = next($queue)) {
536                // For each family on the path
537                for ($n = count($next['path']) - 2; $n >= 1; $n -= 2) {
538                    $exclude = $next['exclude'];
539                    if (count($exclude) >= $recursion) {
540                        continue;
541                    }
542                    $exclude[] = $next['path'][$n];
543                    sort($exclude);
544                    $tmp = implode('-', $exclude);
545                    if (in_array($tmp, $excluded, true)) {
546                        continue;
547                    }
548
549                    $excluded[] = $tmp;
550                    // Add any new path to the queue
551                    foreach ($dijkstra->shortestPaths($xref1, $xref2, $exclude) as $new_path) {
552                        $queue[] = [
553                            'path'    => $new_path,
554                            'exclude' => $exclude,
555                        ];
556                    }
557                }
558            }
559        }
560        // Extract the paths from the queue.
561        $paths = [];
562        foreach ($queue as $next) {
563            // The Dijkstra library does not use strict types, and converts
564            // numeric array keys (XREFs) from strings to integers;
565            $path = array_map($this->stringMapper(), $next['path']);
566
567            // Remove duplicates
568            $paths[implode('-', $next['path'])] = $path;
569        }
570
571        return $paths;
572    }
573
574    /**
575     * Convert numeric values to strings
576     *
577     * @return Closure
578     */
579    private function stringMapper(): Closure
580    {
581        return static function ($xref) {
582            return (string) $xref;
583        };
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