From 7c58eeacf121cebb42818aa059c99c706e2d25e1 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fischer@muhq.space>
Date: Sat, 13 Jun 2026 13:04:56 +0200
Subject: add groups JS

---
 js/group.js | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 js/mock.js  |  4 ++++
 2 files changed, 63 insertions(+)
 create mode 100644 js/group.js

diff --git a/js/group.js b/js/group.js
new file mode 100644
index 0000000..103f368
--- /dev/null
+++ b/js/group.js
@@ -0,0 +1,59 @@
+import { getCourseParticipantsUrl } from "./config.js";
+import { fetchStudents } from "./student-ENV.js";
+
+/**
+ * Class to represent a Group of Students.
+ */
+class Group {
+	constructor(name, students) {
+		this.name = name;
+		if (!students) {
+			this.students = [];
+		}
+	}
+
+	setStudents(students) {
+		this.students = students;
+	}
+
+	addStudent(student) {
+		this.students.push(student);
+	}
+
+	async getStudents() {
+		return students;
+	}
+}
+
+let groups = new Map();
+
+function buildGroups(students) {
+	for (const student of students) {
+		for (const groupName of student.groups) {
+			if (!groups.has(groupName)) {
+				groups.set(groupName, new Group(groupName));
+			}
+			groups.get(groupName).addStudent(student);
+
+			// Create the individual student group
+			const sGroupName = student.getGroupName();
+			groups.set(sGroupName, new Group(sGroupName, [student]));
+		}
+	}
+}
+
+/**
+ * Fetch all Groups and return them as a map.
+ */
+async function fetchGroups() {
+	if (groups.size) {
+		return groups;
+	}
+
+	// Fetch all students and build the groups from them
+	const students = fetchStudents();
+	buildGroups(students);
+	return groups;
+}
+
+export { Group, buildGroups, fetchGroups };
diff --git a/js/mock.js b/js/mock.js
index a189a11..92bb4c6 100644
--- a/js/mock.js
+++ b/js/mock.js
@@ -1,5 +1,6 @@
 import { Graduation, GraduationChange } from "./graduation-common.js";
 import { Student } from "./student-common.js";
+import { buildGroups } from "./group.js";
 
 const students = [
 	new Student(1, 'foo bar', 'test'),
@@ -7,6 +8,9 @@ const students = [
 	new Student(3, 'b b b', '5a')
 ];
 
+// Build the groups from our mock students
+buildGroups(students);
+
 function fetchStudentsMock() {
 	return new Promise((resolve) => { resolve(students); });
 }
-- 
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