feat: admin editable email templates

addresses #869eg7ptr

src/Form/EmailTextType.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Form;
+
+use App\Config\EmailTextDefinition;
+use App\Entity\EmailText;
+use App\Validator\KnownPlaceholders;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\TextareaType;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class EmailTextType extends AbstractType
+{
+    public function buildForm(FormBuilderInterface $builder, array $options): void
+    {
+        /** @var EmailTextDefinition $definition */
+        $definition = $options['definition'];
+        $placeholders = new KnownPlaceholders($definition->getPlaceholderNames());
+
+        $builder
+            ->add('subject', TextType::class, [
+                'label' => 'Betreff',
+                'constraints' => [$placeholders],
+            ])
+            ->add('headline', TextType::class, [
+                'label' => 'Überschrift',
+                'required' => false,
+                'constraints' => [$placeholders],
+            ])
+            ->add('body', TextareaType::class, [
+                'label' => 'Text',
+                'attr' => [
+                    'data-controller' => 'textarea-autosize',
+                    'data-action' => 'textarea-autosize#resize',
+                    'data-textarea-autosize-min-rows-value' => 12,
+                ],
+                'constraints' => [$placeholders],
+            ])
+        ;
+    }
+
+    public function buildView(FormView $view, FormInterface $form, array $options): void
+    {
+        // The list of placeholders is rendered next to the fields, so an admin does not
+        // have to remember which of them this particular mail can fill.
+        $view->vars['definition'] = $options['definition'];
+    }
+
+    public function configureOptions(OptionsResolver $resolver): void
+    {
+        $resolver
+            ->setDefaults([
+                'data_class' => EmailText::class,
+            ])
+            ->setRequired('definition')
+            ->setAllowedTypes('definition', EmailTextDefinition::class)
+        ;
+    }
+}