xref: /webtrees/app/Module/RelationshipsChartModule.php (revision 4991f2057a6647447a648c5d6743dab00378e98e) 
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\Module;
21
22use Aura\Router\RouterContainer;
23use Closure;
24use Fig\Http\Message\RequestMethodInterface;
25use Fisharebest\Algorithm\Dijkstra;
26use Fisharebest\Webtrees\Auth;
27use Fisharebest\Webtrees\Contracts\UserInterface;
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\ModuleService;
35use Fisharebest\Webtrees\Services\RelationshipService;
36use Fisharebest\Webtrees\Services\TreeService;
37use Fisharebest\Webtrees\Tree;
38use Fisharebest\Webtrees\Validator;
39use Illuminate\Database\Capsule\Manager as DB;
40use Illuminate\Database\Query\JoinClause;
41use Illuminate\Support\Collection;
42use Psr\Http\Message\ResponseInterface;
43use Psr\Http\Message\ServerRequestInterface;
44use Psr\Http\Server\RequestHandlerInterface;
45
46use function app;
47use function assert;
48use function redirect;
49use function route;
50use function view;
51
52/**
53 * Class RelationshipsChartModule
54 */
55class RelationshipsChartModule extends AbstractModule implements ModuleChartInterface, ModuleConfigInterface, RequestHandlerInterface
56{
57    use ModuleChartTrait;
58    use ModuleConfigTrait;
59
60    protected const ROUTE_URL = '/tree/{tree}/relationships-{ancestors}-{recursion}/{xref}{/xref2}';
61
62    /** It would be more correct to use PHP_INT_MAX, but this isn't friendly in URLs */
63    public const UNLIMITED_RECURSION = 99;
64
65    /** By default new trees allow unlimited recursion */
66    public const DEFAULT_RECURSION = '99';
67
68    /** By default new trees search for all relationships (not via ancestors) */
69    public const DEFAULT_ANCESTORS  = '0';
70    public const DEFAULT_PARAMETERS = [
71        'ancestors' => self::DEFAULT_ANCESTORS,
72        'recursion' => self::DEFAULT_RECURSION,
73    ];
74
75    private ModuleService $module_service;
76
77    private TreeService $tree_service;
78
79    private RelationshipService $relationship_service;
80
81    /**
82     * @param ModuleService       $module_service
83     * @param RelationshipService $relationship_service
84     * @param TreeService         $tree_service
85     */
86    public function __construct(ModuleService $module_service, RelationshipService $relationship_service, TreeService $tree_service)
87    {
88        $this->module_service       = $module_service;
89        $this->relationship_service = $relationship_service;
90        $this->tree_service         = $tree_service;
91    }
92
93    /**
94     * Initialization.
95     *
96     * @return void
97     */
98    public function boot(): void
99    {
100        Registry::routeFactory()->routeMap()
101            ->get(static::class, static::ROUTE_URL, $this)
102            ->allows(RequestMethodInterface::METHOD_POST)
103            ->tokens([
104                'ancestors' => '\d+',
105                'recursion' => '\d+',
106            ]);
107    }
108
109    /**
110     * A sentence describing what this module does.
111     *
112     * @return string
113     */
114    public function description(): string
115    {
116        /* I18N: Description of the “RelationshipsChart” module */
117        return I18N::translate('A chart displaying relationships between two individuals.');
118    }
119
120    /**
121     * Return a menu item for this chart - for use in individual boxes.
122     *
123     * @param Individual $individual
124     *
125     * @return Menu|null
126     */
127    public function chartBoxMenu(Individual $individual): ?Menu
128    {
129        return $this->chartMenu($individual);
130    }
131
132    /**
133     * A main menu item for this chart.
134     *
135     * @param Individual $individual
136     *
137     * @return Menu
138     */
139    public function chartMenu(Individual $individual): Menu
140    {
141        $my_xref = $individual->tree()->getUserPreference(Auth::user(), UserInterface::PREF_TREE_ACCOUNT_XREF);
142
143        if ($my_xref !== '' && $my_xref !== $individual->xref()) {
144            $my_record = Registry::individualFactory()->make($my_xref, $individual->tree());
145
146            if ($my_record instanceof Individual) {
147                return new Menu(
148                    I18N::translate('Relationship to me'),
149                    $this->chartUrl($my_record, ['xref2' => $individual->xref()]),
150                    $this->chartMenuClass(),
151                    $this->chartUrlAttributes()
152                );
153            }
154        }
155
156        return new Menu(
157            $this->title(),
158            $this->chartUrl($individual),
159            $this->chartMenuClass(),
160            $this->chartUrlAttributes()
161        );
162    }
163
164    /**
165     * CSS class for the URL.
166     *
167     * @return string
168     */
169    public function chartMenuClass(): string
170    {
171        return 'menu-chart-relationship';
172    }
173
174    /**
175     * How should this module be identified in the control panel, etc.?
176     *
177     * @return string
178     */
179    public function title(): string
180    {
181        /* I18N: Name of a module/chart */
182        return I18N::translate('Relationships');
183    }
184
185    /**
186     * The URL for a page showing chart options.
187     *
188     * @param Individual                                $individual
189     * @param array<bool|int|string|array<string>|null> $parameters
190     *
191     * @return string
192     */
193    public function chartUrl(Individual $individual, array $parameters = []): string
194    {
195        return route(static::class, [
196                'xref' => $individual->xref(),
197                'tree' => $individual->tree()->name(),
198            ] + $parameters + self::DEFAULT_PARAMETERS);
199    }
200
201    /**
202     * @param ServerRequestInterface $request
203     *
204     * @return ResponseInterface
205     */
206    public function handle(ServerRequestInterface $request): ResponseInterface
207    {
208        $tree      = Validator::attributes($request)->tree();
209        $xref      = Validator::attributes($request)->isXref()->string('xref');
210        $xref2     = Validator::attributes($request)->isXref()->string('xref2', '');
211        $ajax      = Validator::queryParams($request)->boolean('ajax', false);
212        $ancestors = (int) $request->getAttribute('ancestors');
213        $recursion = (int) $request->getAttribute('recursion');
214        $user      = Validator::attributes($request)->user();
215
216        // Convert POST requests into GET requests for pretty URLs.
217        if ($request->getMethod() === RequestMethodInterface::METHOD_POST) {
218            return redirect(route(static::class, [
219                'tree'      => $tree->name(),
220                'ancestors' => Validator::parsedBody($request)->string('ancestors', ''),
221                'recursion' => Validator::parsedBody($request)->string('recursion', ''),
222                'xref'      => Validator::parsedBody($request)->string('xref', ''),
223                'xref2'     => Validator::parsedBody($request)->string('xref2', ''),
224            ]));
225        }
226
227        $individual1 = Registry::individualFactory()->make($xref, $tree);
228        $individual2 = Registry::individualFactory()->make($xref2, $tree);
229
230        $ancestors_only = (int) $tree->getPreference('RELATIONSHIP_ANCESTORS', static::DEFAULT_ANCESTORS);
231        $max_recursion  = (int) $tree->getPreference('RELATIONSHIP_RECURSION', static::DEFAULT_RECURSION);
232
233        $recursion = min($recursion, $max_recursion);
234
235        Auth::checkComponentAccess($this, ModuleChartInterface::class, $tree, $user);
236
237        if ($individual1 instanceof Individual) {
238            $individual1 = Auth::checkIndividualAccess($individual1, false, true);
239        }
240
241        if ($individual2 instanceof Individual) {
242            $individual2 = Auth::checkIndividualAccess($individual2, false, true);
243        }
244
245        if ($individual1 instanceof Individual && $individual2 instanceof Individual) {
246            if ($ajax) {
247                return $this->chart($individual1, $individual2, $recursion, $ancestors);
248            }
249
250            /* I18N: %s are individual’s names */
251            $title    = I18N::translate('Relationships between %1$s and %2$s', $individual1->fullName(), $individual2->fullName());
252            $ajax_url = $this->chartUrl($individual1, [
253                'ajax'      => true,
254                'ancestors' => $ancestors,
255                'recursion' => $recursion,
256                'xref2'     => $individual2->xref(),
257            ]);
258        } else {
259            $title    = I18N::translate('Relationships');
260            $ajax_url = '';
261        }
262
263        return $this->viewResponse('modules/relationships-chart/page', [
264            'ajax_url'          => $ajax_url,
265            'ancestors'         => $ancestors,
266            'ancestors_only'    => $ancestors_only,
267            'ancestors_options' => $this->ancestorsOptions(),
268            'individual1'       => $individual1,
269            'individual2'       => $individual2,
270            'max_recursion'     => $max_recursion,
271            'module'            => $this->name(),
272            'recursion'         => $recursion,
273            'recursion_options' => $this->recursionOptions($max_recursion),
274            'title'             => $title,
275            'tree'              => $tree,
276        ]);
277    }
278
279    /**
280     * @param Individual $individual1
281     * @param Individual $individual2
282     * @param int        $recursion
283     * @param int        $ancestors
284     *
285     * @return ResponseInterface
286     */
287    public function chart(Individual $individual1, Individual $individual2, int $recursion, int $ancestors): ResponseInterface
288    {
289        $tree = $individual1->tree();
290
291        $max_recursion = (int) $tree->getPreference('RELATIONSHIP_RECURSION', static::DEFAULT_RECURSION);
292
293        $recursion = min($recursion, $max_recursion);
294
295        $paths = $this->calculateRelationships($individual1, $individual2, $recursion, (bool) $ancestors);
296
297        ob_start();
298        if (I18N::direction() === 'ltr') {
299            $diagonal1 = asset('css/images/dline.png');
300            $diagonal2 = asset('css/images/dline2.png');
301        } else {
302            $diagonal1 = asset('css/images/dline2.png');
303            $diagonal2 = asset('css/images/dline.png');
304        }
305
306        $num_paths = 0;
307        foreach ($paths as $path) {
308            // Extract the relationship names between pairs of individuals
309            $relationships = $this->oldStyleRelationshipPath($tree, $path);
310            if ($relationships === []) {
311                // Cannot see one of the families/individuals, due to privacy;
312                continue;
313            }
314
315            $nodes = Collection::make($path)
316                ->map(static function (string $xref, int $key) use ($tree): GedcomRecord {
317                    if ($key % 2 === 0) {
318                        return Registry::individualFactory()->make($xref, $tree);
319                    }
320
321                    return  Registry::familyFactory()->make($xref, $tree);
322                });
323
324            $language = $this->module_service
325                ->findByInterface(ModuleLanguageInterface::class, true)
326                ->first(fn (ModuleLanguageInterface $language): bool => $language->locale()->languageTag() === I18N::languageTag());
327
328            echo '<h3>', I18N::translate('Relationship: %s', $this->relationship_service->nameFromPath($nodes->all(), $language)), '</h3>';
329            $num_paths++;
330
331            // Use a table/grid for layout.
332            $table = [];
333            // Current position in the grid.
334            $x = 0;
335            $y = 0;
336            // Extent of the grid.
337            $min_y = 0;
338            $max_y = 0;
339            $max_x = 0;
340            // For each node in the path.
341            foreach ($path as $n => $xref) {
342                if ($n % 2 === 1) {
343                    switch ($relationships[$n]) {
344                        case 'hus':
345                        case 'wif':
346                        case 'spo':
347                        case 'bro':
348                        case 'sis':
349                        case 'sib':
350                            $table[$x + 1][$y] = '<div style="background:url(' . e(asset('css/images/hline.png')) . ') repeat-x center;  width: 94px; text-align: center"><div class="hline-text" 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>';
351                            $x += 2;
352                            break;
353                        case 'son':
354                        case 'dau':
355                        case 'chi':
356                            if ($n > 2 && preg_match('/fat|mot|par/', $relationships[$n - 2])) {
357                                $table[$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>';
358                                $x += 2;
359                            } else {
360                                $table[$x][$y - 1] = '<div style="background:url(' . e('"' . asset('css/images/vline.png') . '"') . ') repeat-y center; height: 64px; text-align: center;"><div class="vline-text" 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>';
361                            }
362                            $y -= 2;
363                            break;
364                        case 'fat':
365                        case 'mot':
366                        case 'par':
367                            if ($n > 2 && preg_match('/son|dau|chi/', $relationships[$n - 2])) {
368                                $table[$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>';
369                                $x += 2;
370                            } else {
371                                $table[$x][$y + 1] = '<div style="background:url(' . e('"' . asset('css/images/vline.png') . '"') . ') repeat-y center; height: 64px; text-align:center; "><div class="vline-text" 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>';
372                            }
373                            $y += 2;
374                            break;
375                    }
376                    $max_x = max($max_x, $x);
377                    $min_y = min($min_y, $y);
378                    $max_y = max($max_y, $y);
379                } else {
380                    $individual    = Registry::individualFactory()->make($xref, $tree);
381                    $table[$x][$y] = view('chart-box', ['individual' => $individual]);
382                }
383            }
384            echo '<div class="wt-chart wt-chart-relationships">';
385            echo '<table style="border-collapse: collapse; margin: 20px 50px;">';
386            for ($y = $max_y; $y >= $min_y; --$y) {
387                echo '<tr>';
388                for ($x = 0; $x <= $max_x; ++$x) {
389                    echo '<td style="padding: 0;">';
390                    if (isset($table[$x][$y])) {
391                        echo $table[$x][$y];
392                    }
393                    echo '</td>';
394                }
395                echo '</tr>';
396            }
397            echo '</table>';
398            echo '</div>';
399        }
400
401        if (!$num_paths) {
402            echo '<p>', I18N::translate('No link between the two individuals could be found.'), '</p>';
403        }
404
405        $html = ob_get_clean();
406
407        return response($html);
408    }
409
410    /**
411     * @param ServerRequestInterface $request
412     *
413     * @return ResponseInterface
414     */
415    public function getAdminAction(ServerRequestInterface $request): ResponseInterface
416    {
417        $this->layout = 'layouts/administration';
418
419        return $this->viewResponse('modules/relationships-chart/config', [
420            'all_trees'         => $this->tree_service->all(),
421            'ancestors_options' => $this->ancestorsOptions(),
422            'default_ancestors' => self::DEFAULT_ANCESTORS,
423            'default_recursion' => self::DEFAULT_RECURSION,
424            'recursion_options' => $this->recursionConfigOptions(),
425            'title'             => I18N::translate('Chart preferences') . ' — ' . $this->title(),
426        ]);
427    }
428
429    /**
430     * @param ServerRequestInterface $request
431     *
432     * @return ResponseInterface
433     */
434    public function postAdminAction(ServerRequestInterface $request): ResponseInterface
435    {
436        $params = (array) $request->getParsedBody();
437
438        foreach ($this->tree_service->all() as $tree) {
439            $recursion = $params['relationship-recursion-' . $tree->id()] ?? '';
440            $ancestors = $params['relationship-ancestors-' . $tree->id()] ?? '';
441
442            $tree->setPreference('RELATIONSHIP_RECURSION', $recursion);
443            $tree->setPreference('RELATIONSHIP_ANCESTORS', $ancestors);
444        }
445
446        FlashMessages::addMessage(I18N::translate('The preferences for the module “%s” have been updated.', $this->title()), 'success');
447
448        return redirect($this->getConfigLink());
449    }
450
451    /**
452     * Possible options for the ancestors option
453     *
454     * @return array<int,string>
455     */
456    private function ancestorsOptions(): array
457    {
458        return [
459            0 => I18N::translate('Find any relationship'),
460            1 => I18N::translate('Find relationships via ancestors'),
461        ];
462    }
463
464    /**
465     * Possible options for the recursion option
466     *
467     * @return array<int,string>
468     */
469    private function recursionConfigOptions(): array
470    {
471        return [
472            0                         => I18N::translate('none'),
473            1                         => I18N::number(1),
474            2                         => I18N::number(2),
475            3                         => I18N::number(3),
476            self::UNLIMITED_RECURSION => I18N::translate('unlimited'),
477        ];
478    }
479
480    /**
481     * Calculate the shortest paths - or all paths - between two individuals.
482     *
483     * @param Individual $individual1
484     * @param Individual $individual2
485     * @param int        $recursion How many levels of recursion to use
486     * @param bool       $ancestor  Restrict to relationships via a common ancestor
487     *
488     * @return array<array<string>>
489     */
490    private function calculateRelationships(
491        Individual $individual1,
492        Individual $individual2,
493        int $recursion,
494        bool $ancestor = false
495    ): array {
496        $tree = $individual1->tree();
497
498        $rows = DB::table('link')
499            ->where('l_file', '=', $tree->id())
500            ->whereIn('l_type', ['FAMS', 'FAMC'])
501            ->select(['l_from', 'l_to'])
502            ->get();
503
504        // Optionally restrict the graph to the ancestors of the individuals.
505        if ($ancestor) {
506            $ancestors = $this->allAncestors($individual1->xref(), $individual2->xref(), $tree->id());
507            $exclude   = $this->excludeFamilies($individual1->xref(), $individual2->xref(), $tree->id());
508        } else {
509            $ancestors = [];
510            $exclude   = [];
511        }
512
513        $graph = [];
514
515        foreach ($rows as $row) {
516            if ($ancestors === [] || in_array($row->l_from, $ancestors, true) && !in_array($row->l_to, $exclude, true)) {
517                $graph[$row->l_from][$row->l_to] = 1;
518                $graph[$row->l_to][$row->l_from] = 1;
519            }
520        }
521
522        $xref1    = $individual1->xref();
523        $xref2    = $individual2->xref();
524        $dijkstra = new Dijkstra($graph);
525        $paths    = $dijkstra->shortestPaths($xref1, $xref2);
526
527        // Only process each exclusion list once;
528        $excluded = [];
529
530        $queue = [];
531        foreach ($paths as $path) {
532            // Insert the paths into the queue, with an exclusion list.
533            $queue[] = [
534                'path'    => $path,
535                'exclude' => [],
536            ];
537            // While there are un-extended paths
538            for ($next = current($queue); $next !== false; $next = next($queue)) {
539                // For each family on the path
540                for ($n = count($next['path']) - 2; $n >= 1; $n -= 2) {
541                    $exclude = $next['exclude'];
542                    if (count($exclude) >= $recursion) {
543                        continue;
544                    }
545                    $exclude[] = $next['path'][$n];
546                    sort($exclude);
547                    $tmp = implode('-', $exclude);
548                    if (in_array($tmp, $excluded, true)) {
549                        continue;
550                    }
551
552                    $excluded[] = $tmp;
553                    // Add any new path to the queue
554                    foreach ($dijkstra->shortestPaths($xref1, $xref2, $exclude) as $new_path) {
555                        $queue[] = [
556                            'path'    => $new_path,
557                            'exclude' => $exclude,
558                        ];
559                    }
560                }
561            }
562        }
563        // Extract the paths from the queue.
564        $paths = [];
565        foreach ($queue as $next) {
566            // The Dijkstra library does not use strict types, and converts
567            // numeric array keys (XREFs) from strings to integers;
568            $path = array_map($this->stringMapper(), $next['path']);
569
570            // Remove duplicates
571            $paths[implode('-', $next['path'])] = $path;
572        }
573
574        return $paths;
575    }
576
577    /**
578     * Convert numeric values to strings
579     *
580     * @return Closure
581     */
582    private function stringMapper(): Closure
583    {
584        return static function ($xref) {
585            return (string) $xref;
586        };
587    }
588
589    /**
590     * Find all ancestors of a list of individuals
591     *
592     * @param string $xref1
593     * @param string $xref2
594     * @param int    $tree_id
595     *
596     * @return array<string>
597     */
598    private function allAncestors(string $xref1, string $xref2, int $tree_id): array
599    {
600        $ancestors = [
601            $xref1,
602            $xref2,
603        ];
604
605        $queue = [
606            $xref1,
607            $xref2,
608        ];
609        while ($queue !== []) {
610            $parents = DB::table('link AS l1')
611                ->join('link AS l2', static function (JoinClause $join): void {
612                    $join
613                        ->on('l1.l_to', '=', 'l2.l_to')
614                        ->on('l1.l_file', '=', 'l2.l_file');
615                })
616                ->where('l1.l_file', '=', $tree_id)
617                ->where('l1.l_type', '=', 'FAMC')
618                ->where('l2.l_type', '=', 'FAMS')
619                ->whereIn('l1.l_from', $queue)
620                ->pluck('l2.l_from');
621
622            $queue = [];
623            foreach ($parents as $parent) {
624                if (!in_array($parent, $ancestors, true)) {
625                    $ancestors[] = $parent;
626                    $queue[]     = $parent;
627                }
628            }
629        }
630
631        return $ancestors;
632    }
633
634    /**
635     * Find all families of two individuals
636     *
637     * @param string $xref1
638     * @param string $xref2
639     * @param int    $tree_id
640     *
641     * @return array<string>
642     */
643    private function excludeFamilies(string $xref1, string $xref2, int $tree_id): array
644    {
645        return DB::table('link AS l1')
646            ->join('link AS l2', static function (JoinClause $join): void {
647                $join
648                    ->on('l1.l_to', '=', 'l2.l_to')
649                    ->on('l1.l_type', '=', 'l2.l_type')
650                    ->on('l1.l_file', '=', 'l2.l_file');
651            })
652            ->where('l1.l_file', '=', $tree_id)
653            ->where('l1.l_type', '=', 'FAMS')
654            ->where('l1.l_from', '=', $xref1)
655            ->where('l2.l_from', '=', $xref2)
656            ->pluck('l1.l_to')
657            ->all();
658    }
659
660    /**
661     * Convert a path (list of XREFs) to an "old-style" string of relationships.
662     * Return an empty array, if privacy rules prevent us viewing any node.
663     *
664     * @param Tree          $tree
665     * @param array<string> $path Alternately Individual / Family
666     *
667     * @return array<string>
668     */
669    private function oldStyleRelationshipPath(Tree $tree, array $path): array
670    {
671        $spouse_codes = [
672            'M' => 'hus',
673            'F' => 'wif',
674            'U' => 'spo',
675        ];
676        $parent_codes = [
677            'M' => 'fat',
678            'F' => 'mot',
679            'U' => 'par',
680        ];
681        $child_codes = [
682            'M' => 'son',
683            'F' => 'dau',
684            'U' => 'chi',
685        ];
686        $sibling_codes = [
687            'M' => 'bro',
688            'F' => 'sis',
689            'U' => 'sib',
690        ];
691        $relationships = [];
692
693        for ($i = 1, $count = count($path); $i < $count; $i += 2) {
694            $family = Registry::familyFactory()->make($path[$i], $tree);
695            $prev   = Registry::individualFactory()->make($path[$i - 1], $tree);
696            $next   = Registry::individualFactory()->make($path[$i + 1], $tree);
697            if (preg_match('/\n\d (HUSB|WIFE|CHIL) @' . $prev->xref() . '@/', $family->gedcom(), $match)) {
698                $rel1 = $match[1];
699            } else {
700                return [];
701            }
702            if (preg_match('/\n\d (HUSB|WIFE|CHIL) @' . $next->xref() . '@/', $family->gedcom(), $match)) {
703                $rel2 = $match[1];
704            } else {
705                return [];
706            }
707            if (($rel1 === 'HUSB' || $rel1 === 'WIFE') && ($rel2 === 'HUSB' || $rel2 === 'WIFE')) {
708                $relationships[$i] = $spouse_codes[$next->sex()];
709            } elseif (($rel1 === 'HUSB' || $rel1 === 'WIFE') && $rel2 === 'CHIL') {
710                $relationships[$i] = $child_codes[$next->sex()];
711            } elseif ($rel1 === 'CHIL' && ($rel2 === 'HUSB' || $rel2 === 'WIFE')) {
712                $relationships[$i] = $parent_codes[$next->sex()];
713            } elseif ($rel1 === 'CHIL' && $rel2 === 'CHIL') {
714                $relationships[$i] = $sibling_codes[$next->sex()];
715            }
716        }
717
718        return $relationships;
719    }
720
721    /**
722     * Possible options for the recursion option
723     *
724     * @param int $max_recursion
725     *
726     * @return array<string>
727     */
728    private function recursionOptions(int $max_recursion): array
729    {
730        if ($max_recursion === static::UNLIMITED_RECURSION) {
731            $text = I18N::translate('Find all possible relationships');
732        } else {
733            $text = I18N::translate('Find other relationships');
734        }
735
736        return [
737            '0'            => I18N::translate('Find the closest relationships'),
738            $max_recursion => $text,
739        ];
740    }
741}
742