Refactor ProjectActivity model to use Filter and Formatter interface

app/Helper/ProjectActivityHelper.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace Kanboard\Helper;
+
+use Kanboard\Core\Base;
+use Kanboard\Filter\ProjectActivityProjectIdFilter;
+use Kanboard\Filter\ProjectActivityProjectIdsFilter;
+use Kanboard\Filter\ProjectActivityTaskIdFilter;
+use Kanboard\Formatter\ProjectActivityEventFormatter;
+use Kanboard\Model\ProjectActivity;
+
+/**
+ * Project Activity Helper
+ *
+ * @package helper
+ * @author  Frederic Guillot
+ */
+class ProjectActivityHelper extends Base
+{
+    /**
+     * Get project activity events
+     *
+     * @access public
+     * @param  integer  $project_id
+     * @param  int      $limit
+     * @return array
+     */
+    public function getProjectEvents($project_id, $limit = 50)
+    {
+        $queryBuilder = $this->projectActivityQuery
+            ->withFilter(new ProjectActivityProjectIdFilter($project_id));
+
+        $queryBuilder->getQuery()
+            ->desc(ProjectActivity::TABLE.'.id')
+            ->limit($limit)
+        ;
+
+        return $queryBuilder->format(new ProjectActivityEventFormatter($this->container));
+    }
+
+    /**
+     * Get projects activity events
+     *
+     * @access public
+     * @param  int[]    $project_ids
+     * @param  int      $limit
+     * @return array
+     */
+    public function getProjectsEvents(array $project_ids, $limit = 50)
+    {
+        $queryBuilder = $this->projectActivityQuery
+            ->withFilter(new ProjectActivityProjectIdsFilter($project_ids));
+
+        $queryBuilder->getQuery()
+            ->desc(ProjectActivity::TABLE.'.id')
+            ->limit($limit)
+        ;
+
+        return $queryBuilder->format(new ProjectActivityEventFormatter($this->container));
+    }
+
+    /**
+     * Get task activity events
+     *
+     * @access public
+     * @param  integer $task_id
+     * @return array
+     */
+    public function getTaskEvents($task_id)
+    {
+        $queryBuilder = $this->projectActivityQuery
+            ->withFilter(new ProjectActivityTaskIdFilter($task_id));
+
+        $queryBuilder->getQuery()->desc(ProjectActivity::TABLE.'.id');
+
+        return $queryBuilder->format(new ProjectActivityEventFormatter($this->container));
+    }
+}