refactor(analytics): move all analytics files to a new Libraries/Analytics folder

- add page hit on podcast activity page
- update development docs

app/Libraries/Analytics/Models/AnalyticsWebsiteByEntryPageModel.php

@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Class AnalyticsWebsiteByEntryPageModel
+ * Model for analytics_website_by_entry_page table in database
+ * @copyright  2020 Podlibre
+ * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
+ * @link       https://castopod.org/
+ */
+
+namespace Analytics\Models;
+
+use CodeIgniter\Model;
+
+class AnalyticsWebsiteByEntryPageModel extends Model
+{
+    protected $table = 'analytics_website_by_entry_page';
+
+    protected $allowedFields = [];
+
+    protected $returnType = \Analytics\Entities\AnalyticsWebsiteByEntryPage::class;
+    protected $useSoftDeletes = false;
+
+    protected $useTimestamps = false;
+
+    /**
+     * Gets entry pages data for a podcast
+     *
+     * @param int $podcastId
+     *
+     * @return array
+     */
+    public function getData(int $podcastId): array
+    {
+        if (!($found = cache("{$podcastId}_analytics_website_by_entry_page"))) {
+            $oneWeekAgo = date('Y-m-d', strtotime('-1 week'));
+            $found = $this->select(
+                'IF(entry_page_url=\'/\',\'/\',SUBSTRING_INDEX(entry_page_url,\'/\',-1)) as labels',
+            )
+                ->selectSum('hits', 'values')
+                ->where([
+                    'podcast_id' => $podcastId,
+                    'date >' => $oneWeekAgo,
+                ])
+                ->groupBy('labels')
+                ->orderBy('values', 'DESC')
+                ->findAll();
+            cache()->save(
+                "{$podcastId}_analytics_website_by_entry_page",
+                $found,
+                600,
+            );
+        }
+        return $found;
+    }
+}