crater/app/Http/Controllers/V1/General/NextNumberController.php

<?php

namespace Crater\Http\Controllers\V1\General;

use Crater\Models\Invoice;
use Crater\Models\Estimate;
use Crater\Models\Payment;
use Crater\Models\CompanySetting;
use Crater\Http\Controllers\Controller;
use Illuminate\Http\Request;

class NextNumberController extends Controller
{
    /**
     * Handle the incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function __invoke(Request $request)
    {
        $key = $request->key;

        $val = $key . '_prefix';

        $prefix = CompanySetting::getSetting(
            $val,
            $request->header('company')
        );

        $nextNumber = null;

        switch ($key) {
            case 'invoice':
                $nextNumber = Invoice::getNextInvoiceNumber($prefix);
                break;

            case 'estimate':
                $nextNumber = Estimate::getNextEstimateNumber($prefix);
                break;

            case 'payment':
                $nextNumber = Payment::getNextPaymentNumber($prefix);
                break;

            default:
                return;
        }

        return response()->json([
            'nextNumber' => $nextNumber,
            'prefix' => $prefix
        ]);
    }
}