<?php

declare(strict_types=1);

namespace App\Observers;

use App\Models\Performance;

/**
 * Observer for Performance.
 *
 * Increments the optimistic-lock `version` column by 1 on every UPDATE
 * (not on INSERT). RFC v0.2 D14 — `MoveTimetablePerformanceRequest`
 * (Session 2) compares the client-supplied version against the stored
 * value to detect concurrent edits.
 */
final class PerformanceObserver
{
    public function saving(Performance $performance): void
    {
        if ($performance->exists && $performance->isDirty()) {
            $performance->version = (int) $performance->version + 1;
        }
    }
}