From dd9974f776dde086752af4e80828fa1ed76a977f Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 5 Jan 2023 16:04:58 +0100
Subject: [statistics] Add hint regarding blue tint of usage graph

---
 modules-available/statistics/lang/de/template-tags.json |  1 +
 modules-available/statistics/lang/en/template-tags.json |  1 +
 modules-available/statistics/pages/summary.inc.php      |  2 +-
 modules-available/statistics/templates/summary.html     | 14 +++++++-------
 4 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/modules-available/statistics/lang/de/template-tags.json b/modules-available/statistics/lang/de/template-tags.json
index 9445e17a..4e0441e8 100644
--- a/modules-available/statistics/lang/de/template-tags.json
+++ b/modules-available/statistics/lang/de/template-tags.json
@@ -30,6 +30,7 @@
     "lang_free": "frei",
     "lang_fullInfo": "Alle Werte",
     "lang_gbRam": "RAM",
+    "lang_graphLectureTitle": "Blaue F\u00e4rbung = Anzahl der Veranstaltungen",
     "lang_hardwareSummary": "Hardware",
     "lang_hasNotes": "Zu diesem Rechner wurden Notizen hinterlegt",
     "lang_hddUnused": "Ungenutzter Festplattenspeicher",
diff --git a/modules-available/statistics/lang/en/template-tags.json b/modules-available/statistics/lang/en/template-tags.json
index 295e34f6..9d01f7be 100644
--- a/modules-available/statistics/lang/en/template-tags.json
+++ b/modules-available/statistics/lang/en/template-tags.json
@@ -30,6 +30,7 @@
     "lang_free": "free",
     "lang_fullInfo": "All values",
     "lang_gbRam": "RAM",
+    "lang_graphLectureTitle": "Blue shading = number of active lectures",
     "lang_hardwareSummary": "Hardware",
     "lang_hasNotes": "Notes have been added to this client",
     "lang_hddUnused": "Unused hard drive space",
diff --git a/modules-available/statistics/pages/summary.inc.php b/modules-available/statistics/pages/summary.inc.php
index 71faff47..ce16b536 100644
--- a/modules-available/statistics/pages/summary.inc.php
+++ b/modules-available/statistics/pages/summary.inc.php
@@ -91,7 +91,7 @@ class SubPage
 			$points1 = [];
 			$points2 = [];
 			$lectures = [];
-			// Get max from 3 consecutive values, which should be 3*5 = 15m
+			// Get max from 4 consecutive values, which should be 4*5 = 20m
 			$sum = 0;
 			foreach ($res as $row) {
 				if ($row['data'][0] === '{') {
diff --git a/modules-available/statistics/templates/summary.html b/modules-available/statistics/templates/summary.html
index a0efd531..751a9bed 100644
--- a/modules-available/statistics/templates/summary.html
+++ b/modules-available/statistics/templates/summary.html
@@ -30,7 +30,8 @@
 
 				var markings = {{{markings}}};
 				var markMax = Math.max(...markings) * 3;
-				if (markMax <= 0) markMax = 1;
+				var showLegend = markMax > 0;
+				if (markMax < 8) markMax = 8;
 
 				var oldDraw = Chart.prototype._drawDatasets;
 
@@ -65,12 +66,11 @@
 					pointHitRadius: 6,
 					interaction: { mode: 'index' },
 					plugins: {
-						tooltip: { callbacks: { label: function(context) {
-									if (context.dataset.label === 'Courses')
-										return null;
-									return context.dataset.label + ': ' + context.parsed.y;
-								}
-							}},
+						subtitle: {
+							display: showLegend,
+							text: '{{lang_graphLectureTitle}}',
+							position: 'bottom',
+						},
 						legend: {position: 'left' },
 					}
 				}});
-- 
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