thecrimesynticate/app/Services/Game/NerveService.php

<?php

namespace App\Services\Game;

use App\Models\Character;

class NerveService
{
    /**
     * Consume nerve if character can act
     */
    public function consume(Character $character, int $amount): bool
    {
        if (!$character->canAct()) {
            return false;
        }

        return $character->consumeNerve($amount);
    }

    /**
     * Regenerate nerve for a character
     */
    public function regenerate(Character $character): void
    {
        $regenRate = config('game.nerve.regen_rate', 1);

        if ($character->max_nerve <= 0) {
            $character->max_nerve = config('game.nerve.max', 100);
        }

        $character->addNerve($regenRate);
    }

    /**
     * Refill nerve to max for all active characters
     */
    public function refillAll(): int
    {
        return Character::where('nerve', '<', \DB::raw('max_nerve'))
            ->where('status', 'active')
            ->update(['nerve' => \DB::raw('max_nerve')]);
    }
}