Added services

This commit moves most controller logic onto Services. Services are part of the Service-Repository pattern. The models act as repositories.

Services are easily testable and are needed for the upcoming API, in order to avoid duplicated code and to maintain a single source of "truth".

 The User, Vacancy and Vote controllers still need their logic moved onto services.

app/Services/FormManagementService.php

@@ -0,0 +1,76 @@
+<?php
+
+
+namespace App\Services;
+
+use App\Exceptions\EmptyFormException;
+use App\Exceptions\FormHasConstraintsException;
+use App\Form;
+use ContextAwareValidator;
+
+class FormManagementService
+{
+
+    public function addForm($fields) {
+
+        if (count($fields) == 2) {
+            // form is probably empty, since forms with fields will always have more than 2 items
+            throw new EmptyFormException('Sorry, but you may not create empty forms.');
+        }
+
+        $contextValidation = ContextAwareValidator::getValidator($fields, true, true);
+
+        if (! $contextValidation->get('validator')->fails()) {
+            $storableFormStructure = $contextValidation->get('structure');
+
+            Form::create(
+                [
+                    'formName' => $fields['formName'],
+                    'formStructure' => $storableFormStructure,
+                    'formStatus' => 'ACTIVE',
+                ]
+            );
+            return true;
+        }
+        return $contextValidation->get('validator')->errors()->getMessages();
+    }
+
+    public function deleteForm(Form $form) {
+
+        $deletable = true;
+
+        if (! is_null($form) && ! is_null($form->vacancies) && $form->vacancies->count() !== 0 || ! is_null($form->responses)) {
+            $deletable = false;
+        }
+
+        if ($deletable) {
+
+            $form->delete();
+            return true;
+
+        } else {
+
+            throw new FormHasConstraintsException(__('You cannot delete this form because it\'s tied to one or more applications and ranks, or because it doesn\'t exist.'));
+
+        }
+    }
+
+    public function updateForm(Form $form, $fields) {
+
+        $contextValidation = ContextAwareValidator::getValidator($fields, true);
+
+        if (! $contextValidation->get('validator')->fails()) {
+            // Add the new structure into the form. New, subsquent fields will be identified by the "new" prefix
+            // This prefix doesn't actually change the app's behavior when it receives applications.
+            // Additionally, old applications won't of course display new and updated fields, because we can't travel into the past and get data for them
+            $form->formStructure = $contextValidation->get('structure');
+            $form->save();
+
+            return $form;
+
+        } else {
+            return $contextValidation->get('validator')->errors()->getMessages();
+        }
+    }
+
+}