resolves #2: photos can now be moved between albums. Started improving the bulk photo update to use a KnockoutJS view model to remove some of the logic from the view itself.

app/Services/PhotoService.php

@@ -7,6 +7,7 @@ use App\AlbumSources\IAlbumSource;
 use App\Helpers\ImageHelper;
 use App\Helpers\ThemeHelper;
 use App\Photo;
+use Symfony\Component\HttpFoundation\File\File;
 
 class PhotoService
 {
@@ -118,6 +119,32 @@ class PhotoService
         $this->regenerateThumbnails($originalPhotoResource);
     }
 
+    public function changeAlbum(Album $newAlbum)
+    {
+        /** @var IAlbumSource $currentSource */
+        $currentSource = $this->photo->album->getAlbumSource();
+        $newSource = $newAlbum->getAlbumSource();
+
+        // Get the current photo's path
+        $file = new File($currentSource->getPathToPhoto($this->photo));
+
+        // Save to the new album
+        $newSource->saveUploadedPhoto($file, $this->photo->storage_file_name);
+
+        // Delete the original
+        $this->delete();
+
+        // Update the ID and new file name
+        $this->photo->album_id = $newAlbum->id;
+        $this->photo->save();
+
+        // Switch to the new album source
+        $this->albumSource = $newSource;
+
+        // Regenerate the thumbnails in the new album
+        $this->regenerateThumbnails();
+    }
+
     public function delete()
     {
         // Remove all thumbnails first - so if any fail, we don't delete the original