meetup/app/Http/Controllers/HomeController.php

<?php

namespace App\Http\Controllers;

use App\Models\Attender;
use App\Models\Event;
use Illuminate\Http\Request;
use SimpleSoftwareIO\QrCode\Facades\QrCode;
use Illuminate\Support\Facades\Mail;
use Illuminate\Http\File;
use Illuminate\Support\Facades\DB;
use Illuminate\Mail\Message;

class HomeController extends Controller
{
    public function index(){
        $events = Event::orderBy('event_date', 'desc')->paginate(3);
        return view('welcome', [
            'events' => $events
        ]);
    }

    public function apply($id){
        $event = Event::find($id);
        return view('signup', [
            'event' => $event
        ]);
    }

    public function submit(Request $request){
        $data = $request->only(['name', 'surname', 'email', 'file', 'organization', 'is_attending', 'consent_form']);
        $data['attended'] = 0;
        $data['is_attending'] = (bool)$data['is_attending'];
        $data['consent_form'] = (bool)$data['consent_form'] ?? false;

        $attender = Attender::create($data);

        if($data['is_attending']){
            $attender->events()->attach($request->event_id);
            $attendance = DB::table('event_attenders')
                            ->where('event_id', $request->event_id)
                            ->where('attender_id', $attender->id)
                            ->first();

            $file_name = uniqid() . '.png';
            $qrCodePath = public_path('qr/' . $file_name);
            QrCode::format('png')->size(512)->margin(10)->generate($attendance->id, $qrCodePath);

            $imagedata = file_get_contents($qrCodePath);
            $base64 = base64_encode($imagedata);

            Mail::send('emails.qr', ['base64' => $base64, 'attender' => $attender, 'file_name' => $file_name], function (Message $message) use ($attender, $file_name, $base64) {
                $message->to($attender->email)->subject($attender->name . " " . $attender->surname);
            });
        }
        return view('success',[
            'is_attending' => $data['is_attending']
        ]);
    }

    public function shownUp(Request $request){
        $id = $request->id;
        $attendance = DB::table('event_attenders')->find($id);
        $attender = Attender::find($attendance->attender_id);
        $attender->attended = true;
        $attender->save();
        return response()->json(['success' => true, 'data' => $attender]);
    }
}