Refacto wallabag import

Use an abstract class to store all common action from wallabag vX import.
Move specificity in v1 & v2 import.

src/Wallabag/ImportBundle/Import/WallabagV2Import.php

@@ -2,9 +2,7 @@
 
 namespace Wallabag\ImportBundle\Import;
 
-use Wallabag\CoreBundle\Entity\Entry;
-
-class WallabagV2Import extends WallabagV1Import implements ImportInterface
+class WallabagV2Import extends WallabagImport
 {
     /**
      * {@inheritdoc}
@@ -31,55 +29,14 @@ class WallabagV2Import extends WallabagV1Import implements ImportInterface
     }
 
     /**
-     * @param $entries
+     * {@inheritdoc}
      */
-    protected function parseEntries($entries)
+    protected function prepareEntry($entry = [], $markAsRead = false)
     {
-        $i = 1;
-
-        foreach ($entries as $importedEntry) {
-            $existingEntry = $this->em
-                ->getRepository('WallabagCoreBundle:Entry')
-                ->findByUrlAndUserId($importedEntry['url'], $this->user->getId());
-
-            if (false !== $existingEntry) {
-                ++$this->skippedEntries;
-                continue;
-            }
-
-            $importedEntry['html'] = $importedEntry['content'];
-            $importedEntry['content_type'] = $importedEntry['mimetype'];
-
-            $entry = $this->contentProxy->updateEntry(
-                new Entry($this->user),
-                $importedEntry['url'],
-                $importedEntry
-            );
-
-            if (array_key_exists('tags', $importedEntry) && !empty($importedEntry['tags'])) {
-                $this->contentProxy->assignTagsToEntry(
-                    $entry,
-                    $importedEntry['tags']
-                );
-            }
-
-            if (isset($importedEntry['preview_picture'])) {
-                $entry->setPreviewPicture($importedEntry['preview_picture']);
-            }
-
-            $entry->setArchived($importedEntry['is_archived'] || $this->markAsRead);
-            $entry->setStarred($importedEntry['is_starred']);
-
-            $this->em->persist($entry);
-            ++$this->importedEntries;
-
-            // flush every 20 entries
-            if (($i % 20) === 0) {
-                $this->em->flush();
-            }
-            ++$i;
-        }
-
-        $this->em->flush();
+        return [
+            'html' => $entry['content'],
+            'content_type' => $entry['mimetype'],
+            'is_archived' => ($entry['is_archived'] || $markAsRead),
+        ] + $entry;
     }
 }