class.FlashcardShuffleManager.php

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<?php

declare(strict_types=1);

namespace ILIAS\Glossary\Flashcard;

use ILIAS\Data\Clock\ClockInterface;
use ILIAS\Data\Factory as DataFactory;

class FlashcardShuffleManager
{
    public function __construct()
    {
    }

    public function shuffleEntries(
        array $box_entries
    ): array {
        shuffle($box_entries);
        return $box_entries;
    }

    public function shuffleEntriesWithEqualDay(
        array $box_entries
    ): array {
        $tmp_entries = [];
        $tmp_day = "";
        $i = 0;
        // split entries per day
        foreach ($box_entries as $entry) {
            $entry_day = substr($entry["last_access"], 0, 10);
            if (empty($tmp_day)
                || $entry_day === $tmp_day
            ) {
                $tmp_entries[$i][] = $entry;
            } else {
                $tmp_entries[++$i][] = $entry;
            }
            $tmp_day = $entry_day;
        }

        $entries = [];
        // shuffle entries with same day
        foreach ($tmp_entries as $entries_per_day) {
            shuffle($entries_per_day);
            foreach ($entries_per_day as $entry) {
                $entries[] = $entry;
            }
        }

        return $entries;
    }
}