users weekly stats as bar-chart in dashboard (#847)

src/Widget/WidgetService.php

@@ -0,0 +1,81 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Widget;
+
+use App\Repository\WidgetRepository;
+
+class WidgetService
+{
+    /**
+     * @var WidgetRendererInterface[]
+     */
+    protected $renderer = [];
+    /**
+     * @var WidgetRepository
+     */
+    protected $repository;
+
+    /**
+     * @param WidgetRepository $repository
+     * @param WidgetRendererInterface[] $renderer
+     */
+    public function __construct(WidgetRepository $repository, iterable $renderer)
+    {
+        foreach ($renderer as $render) {
+            $this->addRenderer($render);
+        }
+        $this->repository = $repository;
+    }
+
+    /**
+     * @param string $widget
+     * @return bool
+     */
+    public function hasWidget(string $widget): bool
+    {
+        return $this->repository->has($widget);
+    }
+
+    public function getWidget(string $widget): WidgetInterface
+    {
+        return $this->repository->get($widget);
+    }
+
+    public function addRenderer(WidgetRendererInterface $renderer): WidgetService
+    {
+        $this->renderer[] = $renderer;
+
+        return $this;
+    }
+
+    /**
+     * @param WidgetInterface $widget
+     * @return WidgetRendererInterface
+     * @throws WidgetException
+     */
+    public function findRenderer(WidgetInterface $widget): WidgetRendererInterface
+    {
+        foreach ($this->renderer as $renderer) {
+            if ($renderer->supports($widget)) {
+                return $renderer;
+            }
+        }
+
+        throw new WidgetException(sprintf('No renderer available for widget "%s"', get_class($widget)));
+    }
+
+    /**
+     * @return WidgetRendererInterface[]
+     */
+    public function getRenderer(): array
+    {
+        return $this->renderer;
+    }
+}