From a947bd0889cfb2eb58692f92ab19a875019d3b79 Mon Sep 17 00:00:00 2001
From: Hypolite Petovan <hypolite@mrpetovan.com>
Date: Mon, 5 Aug 2019 21:00:27 -0400
Subject: [PATCH] Add Trending Tags widget + template

---
 src/Content/Widget/TrendingTags.php     | 114 ++++++++++++++++++++++++
 view/templates/widget/trending_tags.tpl |  18 ++++
 2 files changed, 132 insertions(+)
 create mode 100644 src/Content/Widget/TrendingTags.php
 create mode 100644 view/templates/widget/trending_tags.tpl

diff --git a/src/Content/Widget/TrendingTags.php b/src/Content/Widget/TrendingTags.php
new file mode 100644
index 0000000000..15a06e029c
--- /dev/null
+++ b/src/Content/Widget/TrendingTags.php
@@ -0,0 +1,114 @@
+<?php
+
+namespace Friendica\Content\Widget;
+
+use Friendica\Core\Cache;
+use Friendica\Core\L10n;
+use Friendica\Core\Renderer;
+use Friendica\Database\DBA;
+use Friendica\Model\Term;
+
+class TrendingTags
+{
+	/**
+	 * @param string $content 'global' (all posts) or 'local' (this node's posts only)
+	 * @param int    $period  Period in hours to consider posts
+	 * @return string
+	 * @throws \Exception
+	 */
+	public static function getHTML($content = 'global', int $period = 24)
+	{
+		if ($content == 'local') {
+			$tags = self::getLocalTrendingTags($period);
+		} else {
+			$tags = self::getGlobalTrendingTags($period);
+		}
+
+		$tpl = Renderer::getMarkupTemplate('widget/trending_tags.tpl');
+		$o = Renderer::replaceMacros($tpl, [
+			'$title' => L10n::tt('Trending Tags (last %d hour)', 'Trending Tags (last %d hours)', $period),
+			'$more' => L10n::t('More Trending Tags'),
+			'$tags' => $tags,
+		]);
+
+		return $o;
+	}
+
+	/**
+	 * Returns a list of the most frequent global tags over the given period
+	 *
+	 * @param int $period Period in hours to consider posts
+	 * @return array
+	 * @throws \Exception
+	 */
+	private static function getGlobalTrendingTags(int $period)
+	{
+		$tags = Cache::get('global_trending_tags');
+
+		if (!$tags) {
+			$tagsStmt = DBA::p("SELECT t.`term`, COUNT(*) AS `score`
+FROM `term` t
+ JOIN `item` i ON i.`id` = t.`oid` AND i.`uid` = t.`uid`
+ JOIN `thread` ON `thread`.`iid` = i.`id`
+WHERE `thread`.`visible`
+  AND NOT `thread`.`deleted`
+  AND NOT `thread`.`moderated`
+  AND NOT `thread`.`private`
+  AND t.`uid` = 0
+  AND t.`otype` = ?
+  AND t.`type` = ?
+  AND t.`term` != ''
+  AND i.`received` > DATE_SUB(NOW(), INTERVAL ? HOUR)
+GROUP BY `term`
+ORDER BY `score` DESC
+LIMIT 20", Term::OBJECT_TYPE_POST, Term::HASHTAG, $period);
+
+			if (DBA::isResult($tags)) {
+				$tags = DBA::toArray($tagsStmt);
+				Cache::set('global_trending_tags', $tags, Cache::HOUR);
+			}
+		}
+
+		return $tags ?: [];
+	}
+
+	/**
+	 * Returns a list of the most frequent local tags over the given period
+	 *
+	 * @param int $period Period in hours to consider posts
+	 * @return array
+	 * @throws \Exception
+	 */
+	private static function getLocalTrendingTags(int $period)
+	{
+		$tags = Cache::get('local_trending_tags');
+
+		if (!$tags) {
+			$tagsStmt = DBA::p("SELECT t.`term`, COUNT(*) AS `score`
+FROM `term` t
+JOIN `item` i ON i.`id` = t.`oid` AND i.`uid` = t.`uid`
+JOIN `thread` ON `thread`.`iid` = i.`id`
+JOIN `user` ON `user`.`uid` = `thread`.`uid` AND NOT `user`.`hidewall`
+WHERE `thread`.`visible`
+  AND NOT `thread`.`deleted`
+  AND NOT `thread`.`moderated`
+  AND NOT `thread`.`private`
+  AND `thread`.`wall`
+  AND `thread`.`origin`
+  AND t.`otype` = ?
+  AND t.`type` = ?
+  AND t.`term` != ''
+  AND i.`received` > DATE_SUB(NOW(), INTERVAL ? HOUR)
+GROUP BY `term`
+ORDER BY `score` DESC
+LIMIT 20", Term::OBJECT_TYPE_POST, Term::HASHTAG, $period);
+
+			if (DBA::isResult($tags)) {
+				$tags = DBA::toArray($tagsStmt);
+				Cache::set('local_trending_tags', $tags, Cache::HOUR);
+			}
+		}
+
+		return $tags ?: [];
+	}
+}
diff --git a/view/templates/widget/trending_tags.tpl b/view/templates/widget/trending_tags.tpl
new file mode 100644
index 0000000000..554b4984e4
--- /dev/null
+++ b/view/templates/widget/trending_tags.tpl
@@ -0,0 +1,18 @@
+<div id="trending-tags-sidebar" class="widget">
+	<h3>{{$title}}</h3>
+	<ul>
+{{section name=ol loop=$tags max=10}}
+		<li><a href="search?tag={{$tags[ol].term}}">{{$tags[ol].term}}</a></li>
+{{/section}}
+	</ul>
+{{if $tags|count > 10}}
+	<details>
+		<summary>{{$more}}</summary>
+		<ul>
+	{{section name=ul loop=$tags start=10}}
+			<li><a href="search?tag={{$tags[ul].term}}">{{$tags[ul].term}}</a></li>
+	{{/section}}
+		</ul>
+	</details>
+{{/if}}
+</div>