start working on trade email sending

src/Controller/TradeController.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Controller;
+
+use App\Repository\OfferingRepository;
+use App\Repository\WishRepository;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Mailer\MailerInterface;
+use Symfony\Component\Mime\Email;
+use Symfony\Component\Routing\Annotation\Route;
+
+class TradeController extends AbstractController
+{
+    #[Route('/trade/{id}', name: 'trade')]
+    public function sendEmail(MailerInterface $mailer, OfferingRepository $offeringRepository, WishRepository $wishRepository): Response
+    {
+        $user = $this->getUser();
+        $offer = $offeringRepository->();
+
+        if(/* user not the logged in user */)
+        $email = (new Email())
+            ->from('no-reply@pfleanz.li')
+            ->to(/* user of offer */)
+            ->replyTo(/* logged in user */)
+            ->subject('Time for Symfony Mailer!')
+            ->text('Sending emails is fun again!')
+            ->htmlTemplate('user/trade/offer_email.html.twig');
+        try
+        {
+            $mailer->send($email);
+        } catch (TransportExceptionInterface $e) {
+            // TODO:
+            // print error
+        }
+        return $this->redirectToRoute('/offer', {'id': $id});
+    }
+}

templates/offer/trade/trade_email.html.twig

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+<h1>{{ user.username}} wants to trade!</h1>
+
+<p>You can checkout their offer  and reply to this email if you want to trade.</p>
+
+<a href={{ path('user_public', id: { 'id': offer.byuser.id }) }}</a>