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<?php

declare(strict_types=1);

use Fisharebest\Webtrees\Elements\EmptyElement;
use Fisharebest\Webtrees\Registry;
use Fisharebest\Webtrees\Tree;

/**
 * @var string        $gedcom
 * @var array<string> $hierarchy
 * @var string        $prefix
 * @var Tree          $tree
 */

preg_match_all('/^(\d+) (\w+) ?(.*)/m', $gedcom, $matches);
[, $levels, $tags, $values] = $matches;
$levels   = array_map(static fn (string $x): int => (int) $x, $levels);
$keys     = array_keys($levels);
$elements = [];
$ids      = [];
$indent   = [];
$collapse = [];

foreach ($keys as $num => $key) {
    $hierarchy[$levels[$key]] = $tags[$key];
    $elements[$key]           = Registry::elementFactory()->make(implode(':', array_slice($hierarchy, 0, 1 + $levels[$key])));
    $ids[$key]                = Registry::idFactory()->id() . '-' . implode('-', array_slice($hierarchy, 0, 1 + $levels[$key]));

    // Does this element have any children?
    $has_subtags = ($levels[$key + 1] ?? 0) > $levels[$key];

    // Do these children have values?
    $has_subtags_with_values = false;
    for ($n = $key + 1; $n < count($keys) && $levels[$n] > $levels[$key]; ++$n) {
        if ($values[$n] !== '') {
            $has_subtags_with_values = true;
            break;
        }
    }

    $indent[$key] = $elements[$key]->collapseChildren() && $has_subtags;

    $collapse[$key] = $num > 0 && $indent[$key] && !$has_subtags_with_values;
}

?>
<?php foreach ($keys as $key) : ?>
    <?php if ($indent[$key - 1] ?? false) : ?>
        <?php if ($collapse[$key - 1] ?? false) : ?>
            <div id="collapse-<?= $ids[$key] ?>" class="collapse wt-nested-edit-fields">
        <?php else : ?>
                <div class="wt-nested-edit-fields">
        <?php endif ?>
    <?php endif ?>

    <?php if ($elements[$key] instanceof EmptyElement && $values[$key] === '') : ?>
        <input type="hidden" name="<?= e($prefix) ?>levels[]" value="<?= $levels[$key] ?>">
        <input type="hidden" name="<?= e($prefix) ?>tags[]" value="<?= e($tags[$key]) ?>">
        <input type="hidden" name="<?= e($prefix) ?>values[]" value="">
    <?php else : ?>
        <div class="row mb-3">
            <label class="col-sm-3 col-form-label" for="<?= e($ids[$key]) ?>">
                <?= $elements[$key]->label() ?>
                <?php if ($collapse[$key]) : ?>
                    <button class="btn btn-link" data-bs-target="#collapse-<?= $ids[$key + 1] ?>" data-bs-toggle="collapse" aria-expanded="false" aria-controls="collapse-<?= $ids[$key + 1] ?>" type="button">
                        <?= view('icons/expand') ?>
                        <?= view('icons/collapse') ?>
                    </button>
                <?php endif ?>
            </label>

            <div class="col-sm">
                <input type="hidden" name="<?= e($prefix) ?>levels[]" value="<?= $levels[$key] ?>">
                <input type="hidden" name="<?= e($prefix) ?>tags[]" value="<?= e($tags[$key]) ?>">
                <?= $elements[$key]->edit($ids[$key], $prefix . 'values[]', strtr($values[$key], ["\r" => "\n"]), $tree) ?>
            </div>
        </div>
    <?php endif ?>

    <?php for ($n = $key; $levels[$n] >= ($levels[$key + 1] ?? $levels[0]); $n--) : ?>
        <?php if ($indent[$n]) : ?>
            <?php $indent[$n] = false ?>
            </div>
        <?php endif ?>
        <?php if ($levels[$n] === ($levels[$key + 1] ?? $levels[0])) : ?>
            <?php break; ?>
        <?php endif ?>
    <?php endfor ?>
<?php endforeach ?>