<?php

namespace App\Support;

use App\Models\Activity;
use App\Models\TicketGrabEvent;

final class VerifyPortalCode
{
    /** 8 位十六进制，便于手机录入；全库（活动+抢票）唯一 */
    public static function generateUnique(): string
    {
        for ($i = 0; $i < 80; $i++) {
            $c = strtolower(substr(bin2hex(random_bytes(4)), 0, 8));
            if (! self::isTaken($c)) {
                return $c;
            }
        }

        return strtolower(substr(bin2hex(random_bytes(8)), 0, 12));
    }

    public static function isTaken(string $code): bool
    {
        $code = strtolower(trim($code));

        return Activity::query()->where('verify_portal_code', $code)->exists()
            || TicketGrabEvent::query()->where('verify_portal_code', $code)->exists();
    }

    public static function ensureForActivity(Activity $activity): void
    {
        if ($activity->verify_portal_code !== null && $activity->verify_portal_code !== '') {
            return;
        }
        $activity->forceFill(['verify_portal_code' => self::generateUnique()])->save();
    }

    public static function ensureForTicketGrabEvent(TicketGrabEvent $event): void
    {
        if ($event->verify_portal_code !== null && $event->verify_portal_code !== '') {
            return;
        }
        $event->forceFill(['verify_portal_code' => self::generateUnique()])->save();
    }
}