simplified code and added documentation

.gitignore

@@ -4,9 +4,6 @@
 .AppleDouble
 .LSOverride
 
-# Icon must end with two \r
-Icon
-
 
 # Thumbnails
 ._*
@@ -129,4 +126,4 @@ iOSInjectionProject/
 **/xcshareddata/WorkspaceSettings.xcsettings
 
 # JavaScript Backend
-node_modules/
+node_modules/

LICENSE

@@ -1,73 +1,6 @@
-Apache License
+Copyright (c) 2026 Theis Gaedigk
-Version 2.0, January 2004
-http://www.apache.org/licenses/
 
-TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+All rights reserved.
 
-1. Definitions.
+This source code is not to be copied, modified, or distributed in any form
-
+without explicit written permission from the author.
-"License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.
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-
-"You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License.
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-"Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files.
-
-"Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types.
-
-"Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below).
-
-"Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof.
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-"Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution."
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-9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability.
-
-END OF TERMS AND CONDITIONS
-
-APPENDIX: How to apply the Apache License to your work.
-
-To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!)  The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives.
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-Copyright 2026 theis.gaedigk
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
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-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.

README.md

@@ -1,4 +1,6 @@
 # Watch Untis
 An Untis (light) app for the Apple Watch.
 
-Created by Theis
+I will **start** programming with the iOS and watchOS app on the <ins>**20th of July 2026**</ins>, and I will update this README with more information as I progress.
+
+Created by Theis

backend/exampleResponse.json

@@ -0,0 +1,392 @@
+[
+  {
+    "room": "027",
+    "teacher": "DavA",
+    "subject": "BI 2",
+    "startTime": "08:00",
+    "endTime": "09:40",
+    "weekday": "Freitag",
+    "date": "17.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "09:40",
+    "endTime": "10:25",
+    "weekday": "Freitag",
+    "date": "17.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "U56",
+    "teacher": "BürD",
+    "subject": "TC G1",
+    "startTime": "10:55",
+    "endTime": "12:25",
+    "weekday": "Freitag",
+    "date": "17.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "12:30",
+    "endTime": "13:15",
+    "weekday": "Freitag",
+    "date": "17.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "254",
+    "teacher": "RadF",
+    "subject": "E  G4",
+    "startTime": "14:00",
+    "endTime": "14:45",
+    "weekday": "Freitag",
+    "date": "17.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "230",
+    "teacher": "HeeA",
+    "subject": "Ku G3",
+    "startTime": "14:45",
+    "endTime": "16:20",
+    "weekday": "Freitag",
+    "date": "17.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "09:40",
+    "endTime": "10:25",
+    "weekday": "Montag",
+    "date": "20.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "255",
+    "teacher": "ScLa",
+    "subject": "M  G2",
+    "startTime": "10:55",
+    "endTime": "12:25",
+    "weekday": "Montag",
+    "date": "20.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "12:30",
+    "endTime": "13:15",
+    "weekday": "Montag",
+    "date": "20.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "U53",
+    "teacher": "WenS",
+    "subject": "Ph G2",
+    "startTime": "14:00",
+    "endTime": "14:45",
+    "weekday": "Montag",
+    "date": "20.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "NGB",
+    "teacher": "NGB",
+    "subject": "H0",
+    "startTime": "14:45",
+    "endTime": "16:20",
+    "weekday": "Montag",
+    "date": "20.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "255",
+    "teacher": "VanC",
+    "subject": "D  G2",
+    "startTime": "08:55",
+    "endTime": "09:40",
+    "weekday": "Dienstag",
+    "date": "21.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "09:40",
+    "endTime": "10:25",
+    "weekday": "Dienstag",
+    "date": "21.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "U53",
+    "teacher": "WenS",
+    "subject": "Ph G2",
+    "startTime": "10:55",
+    "endTime": "11:40",
+    "weekday": "Dienstag",
+    "date": "21.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "255",
+    "teacher": "RadF",
+    "subject": "E  G4",
+    "startTime": "11:40",
+    "endTime": "12:25",
+    "weekday": "Dienstag",
+    "date": "21.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "12:30",
+    "endTime": "13:15",
+    "weekday": "Dienstag",
+    "date": "21.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "TKS-3",
+    "teacher": "TKS",
+    "subject": "F7",
+    "startTime": "14:45",
+    "endTime": "16:20",
+    "weekday": "Dienstag",
+    "date": "21.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "261",
+    "teacher": "PerJ",
+    "subject": "S  G1",
+    "startTime": "14:45",
+    "endTime": "16:20",
+    "weekday": "Dienstag",
+    "date": "21.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "253",
+    "teacher": "BecN",
+    "subject": "SW G2",
+    "startTime": "08:00",
+    "endTime": "09:40",
+    "weekday": "Mittwoch",
+    "date": "22.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "09:40",
+    "endTime": "10:25",
+    "weekday": "Mittwoch",
+    "date": "22.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "255",
+    "teacher": "VanC",
+    "subject": "D  G2",
+    "startTime": "10:55",
+    "endTime": "11:40",
+    "weekday": "Mittwoch",
+    "date": "22.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "040-2",
+    "teacher": "ScLa",
+    "subject": "Sp G2",
+    "startTime": "11:40",
+    "endTime": "12:25",
+    "weekday": "Mittwoch",
+    "date": "22.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "040-3",
+    "teacher": "HofS",
+    "subject": "Sp G4",
+    "startTime": "11:40",
+    "endTime": "12:25",
+    "weekday": "Mittwoch",
+    "date": "22.04.2026",
+    "cancelled": true
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "12:30",
+    "endTime": "13:15",
+    "weekday": "Mittwoch",
+    "date": "22.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "261",
+    "teacher": "MasL",
+    "subject": "ER G1",
+    "startTime": "14:00",
+    "endTime": "15:30",
+    "weekday": "Mittwoch",
+    "date": "22.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "–",
+    "teacher": "–",
+    "subject": "ER G4",
+    "startTime": "14:00",
+    "endTime": "15:30",
+    "weekday": "Mittwoch",
+    "date": "22.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "TKS-3",
+    "teacher": "TKS-1",
+    "subject": "F7",
+    "startTime": "08:00",
+    "endTime": "09:40",
+    "weekday": "Donnerstag",
+    "date": "23.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "255",
+    "teacher": "PerJ",
+    "subject": "S  G1",
+    "startTime": "08:00",
+    "endTime": "09:40",
+    "weekday": "Donnerstag",
+    "date": "23.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "09:40",
+    "endTime": "10:25",
+    "weekday": "Donnerstag",
+    "date": "23.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "254",
+    "teacher": "WedL",
+    "subject": "EK G2",
+    "startTime": "10:55",
+    "endTime": "12:25",
+    "weekday": "Donnerstag",
+    "date": "23.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "12:30",
+    "endTime": "13:15",
+    "weekday": "Donnerstag",
+    "date": "23.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "040-2",
+    "teacher": "ScLa",
+    "subject": "Sp G2",
+    "startTime": "14:45",
+    "endTime": "16:20",
+    "weekday": "Donnerstag",
+    "date": "23.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "040-3",
+    "teacher": "HofS",
+    "subject": "Sp G4",
+    "startTime": "14:45",
+    "endTime": "16:20",
+    "weekday": "Donnerstag",
+    "date": "23.04.2026",
+    "cancelled": true
+  },
+  {
+    "room": "027",
+    "teacher": "DavA",
+    "subject": "BI 2",
+    "startTime": "08:00",
+    "endTime": "09:40",
+    "weekday": "Freitag",
+    "date": "24.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "09:40",
+    "endTime": "10:25",
+    "weekday": "Freitag",
+    "date": "24.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "U56",
+    "teacher": "BürD",
+    "subject": "TC G1",
+    "startTime": "10:55",
+    "endTime": "12:25",
+    "weekday": "Freitag",
+    "date": "24.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "-",
+    "teacher": "-",
+    "subject": "SZ",
+    "startTime": "12:30",
+    "endTime": "13:15",
+    "weekday": "Freitag",
+    "date": "24.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "254",
+    "teacher": "RadF",
+    "subject": "E  G4",
+    "startTime": "14:00",
+    "endTime": "14:45",
+    "weekday": "Freitag",
+    "date": "24.04.2026",
+    "cancelled": false
+  },
+  {
+    "room": "230",
+    "teacher": "HeeA",
+    "subject": "Ku G3",
+    "startTime": "14:45",
+    "endTime": "16:20",
+    "weekday": "Freitag",
+    "date": "24.04.2026",
+    "cancelled": false
+  }
+]

backend/formatter.js

@@ -0,0 +1,272 @@
+/**
+ * Formats the raw WebUntis JSON-RPC timetable response into a compact list of lessons.
+ *
+ * Output schema (per entry):
+ * - room: string
+ * - teacher: string
+ * - subject: string
+ * - startTime: "HH:MM" | "–"
+ * - endTime: "HH:MM" | "–"
+ * - weekday: German weekday name | "–"
+ * - date: "DD.MM.YYYY" | "–"
+ * - cancelled: boolean
+ *
+ * Business rules implemented here:
+ * 1) SZ normalization:
+ *    If multiple lessons share the same day + same start time and at least one subject starts
+ *    with "SZ" (e.g. "SZ1", "SZ10"), the whole slot becomes exactly ONE entry with:
+ *    subject="SZ", room="-", teacher="-".
+ * 2) Cancelled flag:
+ *    If the raw item contains code="cancelled", cancelled=true, otherwise cancelled=false.
+ * 3) Double-lesson merging:
+ *    Consecutive lessons with same (date, weekday, subject, teacher, room) are merged into one
+ *    block by extending endTime. A small gap (break) up to MERGE_GAP_MINUTES is allowed.
+ *
+ * @param {any} rawData WebUntis JSON-RPC response (expects rawData.result to be an array)
+ * @returns {Array<{room:string,teacher:string,subject:string,startTime:string,endTime:string,weekday:string,date:string,cancelled:boolean}>}
+ */
+export const formatData = (rawData) => {
+  const weekdays = [
+    "Sonntag",
+    "Montag",
+    "Dienstag",
+    "Mittwoch",
+    "Donnerstag",
+    "Freitag",
+    "Samstag",
+  ];
+
+  /**
+   * Allowed gap (in minutes) between two blocks to still merge them into a double lesson.
+   * Example: 15:30 -> 15:35 (5 min break) will still merge.
+   */
+  const MERGE_GAP_MINUTES = 15;
+
+  /**
+   * WebUntis times are typically numbers like 800, 855, 1435.
+   * Converts to "HH:MM". Returns "–" for missing/invalid values.
+   */
+  function formatTime(time) {
+    if (time === null || time === undefined) return "–";
+    const n = Number(time);
+    if (!Number.isFinite(n)) return "–";
+    const str = String(time).padStart(4, "0");
+    return str.slice(0, 2) + ":" + str.slice(2);
+  }
+
+  /**
+   * WebUntis dates are typically numbers like 20260417.
+   * Converts to "DD.MM.YYYY". Returns "–" for missing/invalid values.
+   */
+  function formatDate(date) {
+    if (date === null || date === undefined) return "–";
+    const str = String(date);
+    if (str.length < 8) return "–";
+    return str.slice(6, 8) + "." + str.slice(4, 6) + "." + str.slice(0, 4);
+  }
+
+  /**
+   * Returns German weekday name for a WebUntis date (YYYYMMDD).
+   * Returns "–" for missing/invalid values.
+   */
+  function getWeekday(date) {
+    if (date === null || date === undefined) return "–";
+    const str = String(date);
+    if (str.length < 8) return "–";
+    const d = new Date(str.slice(0, 4), str.slice(4, 6) - 1, str.slice(6, 8));
+    if (Number.isNaN(d.getTime())) return "–";
+    return weekdays[d.getDay()];
+  }
+
+  /**
+   * Parses "HH:MM" into minutes since midnight.
+   * Returns null for "–" or invalid values.
+   */
+  function parseTimeToMinutes(timeStr) {
+    if (!timeStr || timeStr === "–") return null;
+    const [h, m] = String(timeStr).split(":");
+    const hh = Number(h);
+    const mm = Number(m);
+    if (!Number.isFinite(hh) || !Number.isFinite(mm)) return null;
+    if (hh < 0 || hh > 23 || mm < 0 || mm > 59) return null;
+    return hh * 60 + mm;
+  }
+
+  /**
+   * Converts a formatted date "DD.MM.YYYY" to a sortable numeric key YYYYMMDD.
+   * Returns null for "–" or invalid values.
+   */
+  function dateKeyFromFormatted(dateStr) {
+    if (!dateStr || dateStr === "–") return null;
+    const [dd, mm, yyyy] = String(dateStr).split(".");
+    const d = Number(dd);
+    const m = Number(mm);
+    const y = Number(yyyy);
+    if (!Number.isFinite(d) || !Number.isFinite(m) || !Number.isFinite(y)) {
+      return null;
+    }
+    return y * 10000 + m * 100 + d;
+  }
+
+  /** @type {any[]} */
+  const items = rawData?.result ?? [];
+  const lessons = [];
+
+  for (const item of items) {
+    if (item?.activityType !== "Unterricht") continue;
+
+    // Subject name is typically in item.su[0].name.
+    const subject = item?.su?.[0]?.name ?? "–";
+    const normalizedSubject = String(subject).trimStart();
+    const isSz = normalizedSubject.startsWith("SZ");
+
+    // WebUntis uses item.code === "cancelled" for cancelled lessons.
+    const cancelled =
+      String(item?.code ?? "")
+        .trim()
+        .toLowerCase() === "cancelled";
+
+    lessons.push({
+      room: item?.ro?.[0]?.name ?? "–",
+      teacher: item?.te?.[0]?.name ?? "–",
+      subject,
+      startTime: formatTime(item?.startTime),
+      endTime: formatTime(item?.endTime),
+      weekday: getWeekday(item?.date),
+      date: formatDate(item?.date),
+      cancelled,
+
+      // internal fields for grouping/sorting
+      _dateRaw: Number(item?.date) || 0,
+      _startTimeRaw: Number(item?.startTime) || 0,
+      _endTimeRaw: Number(item?.endTime) || 0,
+      _isSz: isSz,
+    });
+  }
+
+  lessons.sort((a, b) => {
+    if (a._dateRaw !== b._dateRaw) return a._dateRaw - b._dateRaw;
+    if (a._startTimeRaw !== b._startTimeRaw)
+      return a._startTimeRaw - b._startTimeRaw;
+    return a._endTimeRaw - b._endTimeRaw;
+  });
+
+  // 1) Group by same day + same start time.
+  //    If any subject in a group starts with "SZ", collapse the whole group into ONE SZ entry.
+  const groups = new Map();
+  for (const lesson of lessons) {
+    const key = `${lesson._dateRaw}-${lesson._startTimeRaw}`;
+    const group = groups.get(key);
+    if (group) group.push(lesson);
+    else groups.set(key, [lesson]);
+  }
+
+  const timetable = [];
+
+  for (const group of groups.values()) {
+    const hasSz = group.some((l) => l._isSz);
+    if (!hasSz) {
+      for (const lesson of group) {
+        const { _dateRaw, _startTimeRaw, _endTimeRaw, _isSz, ...publicLesson } =
+          lesson;
+        timetable.push(publicLesson);
+      }
+      continue;
+    }
+
+    // Normalize: if any SZ* exists, show exactly one SZ block for that slot.
+    const base = group.find((l) => l._isSz) ?? group[0];
+    const maxEndRaw = group.reduce(
+      (max, l) => (l._endTimeRaw > max ? l._endTimeRaw : max),
+      0,
+    );
+    // SZ cancelled only if ALL underlying entries are cancelled.
+    // If at least one is not cancelled, the SZ block is considered not cancelled.
+    const cancelled = group.every((l) => l.cancelled);
+
+    timetable.push({
+      room: "-",
+      teacher: "-",
+      subject: "SZ",
+      startTime: base.startTime,
+      endTime: maxEndRaw ? formatTime(maxEndRaw) : base.endTime,
+      weekday: base.weekday,
+      date: base.date,
+      cancelled,
+    });
+  }
+
+  // 2) Merge double lessons: group by (date, weekday, subject, teacher, room)
+  //    and merge consecutive time blocks within each group.
+  const bucketKey = (e) =>
+    `${e.date}|${e.weekday}|${e.subject}|${e.teacher}|${e.room}`;
+
+  const buckets = new Map();
+  for (const entry of timetable) {
+    const key = bucketKey(entry);
+    const arr = buckets.get(key);
+    if (arr) arr.push(entry);
+    else buckets.set(key, [entry]);
+  }
+
+  const merged = [];
+
+  for (const arr of buckets.values()) {
+    arr.sort((a, b) => {
+      const as = parseTimeToMinutes(a.startTime) ?? 0;
+      const bs = parseTimeToMinutes(b.startTime) ?? 0;
+      if (as !== bs) return as - bs;
+      const ae = parseTimeToMinutes(a.endTime) ?? 0;
+      const be = parseTimeToMinutes(b.endTime) ?? 0;
+      return ae - be;
+    });
+
+    const mergedArr = [];
+    for (const entry of arr) {
+      const prev = mergedArr[mergedArr.length - 1];
+      if (!prev) {
+        mergedArr.push(entry);
+        continue;
+      }
+
+      const prevEnd = parseTimeToMinutes(prev.endTime);
+      const currStart = parseTimeToMinutes(entry.startTime);
+      const currEnd = parseTimeToMinutes(entry.endTime);
+
+      const canMergeTimes =
+        prevEnd !== null &&
+        currStart !== null &&
+        currEnd !== null &&
+        currStart >= prevEnd &&
+        currStart - prevEnd <= MERGE_GAP_MINUTES;
+
+      if (canMergeTimes) {
+        prev.endTime = entry.endTime;
+        prev.cancelled = Boolean(prev.cancelled) || Boolean(entry.cancelled);
+        continue;
+      }
+
+      mergedArr.push(entry);
+    }
+
+    merged.push(...mergedArr);
+  }
+
+  merged.sort((a, b) => {
+    const ad = dateKeyFromFormatted(a.date) ?? 0;
+    const bd = dateKeyFromFormatted(b.date) ?? 0;
+    if (ad !== bd) return ad - bd;
+    const as = parseTimeToMinutes(a.startTime) ?? 0;
+    const bs = parseTimeToMinutes(b.startTime) ?? 0;
+    if (as !== bs) return as - bs;
+
+    // stable-ish: keep similar subjects grouped
+    const subj = String(a.subject).localeCompare(String(b.subject));
+    if (subj !== 0) return subj;
+    const room = String(a.room).localeCompare(String(b.room));
+    if (room !== 0) return room;
+    return String(a.teacher).localeCompare(String(b.teacher));
+  });
+
+  return merged;
+};

backend/package-lock.json

@@ -9,6 +9,8 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
+        "axios": "^1.15.0",
+        "dotenv": "^17.4.2",
         "express": "^5.2.1"
       }
     },
@@ -25,6 +27,23 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
+      "license": "MIT"
+    },
+    "node_modules/axios": {
+      "version": "1.15.0",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-1.15.0.tgz",
+      "integrity": "sha512-wWyJDlAatxk30ZJer+GeCWS209sA42X+N5jU2jy6oHTp7ufw8uzUTVFBX9+wTfAlhiJXGS0Bq7X6efruWjuK9Q==",
+      "license": "MIT",
+      "dependencies": {
+        "follow-redirects": "^1.15.11",
+        "form-data": "^4.0.5",
+        "proxy-from-env": "^2.1.0"
+      }
+    },
     "node_modules/body-parser": {
       "version": "2.2.2",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.2.2.tgz",
@@ -87,6 +106,18 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "license": "MIT",
+      "dependencies": {
+        "delayed-stream": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/content-disposition": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.0.1.tgz",
@@ -144,6 +175,15 @@
         }
       }
     },
+    "node_modules/delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/depd": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
@@ -153,6 +193,18 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/dotenv": {
+      "version": "17.4.2",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.4.2.tgz",
+      "integrity": "sha512-nI4U3TottKAcAD9LLud4Cb7b2QztQMUEfHbvhTH09bqXTxnSie8WnjPALV/WMCrJZ6UV/qHJ6L03OqO3LcdYZw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
@@ -212,6 +264,21 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/es-set-tostringtag": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.1.0.tgz",
+      "integrity": "sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==",
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.6",
+        "has-tostringtag": "^1.0.2",
+        "hasown": "^2.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -291,6 +358,63 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/follow-redirects": {
+      "version": "1.16.0",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.16.0.tgz",
+      "integrity": "sha512-y5rN/uOsadFT/JfYwhxRS5R7Qce+g3zG97+JrtFZlC9klX/W5hD7iiLzScI4nZqUS7DNUdhPgw4xI8W2LuXlUw==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/RubenVerborgh"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=4.0"
+      },
+      "peerDependenciesMeta": {
+        "debug": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/form-data": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.5.tgz",
+      "integrity": "sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w==",
+      "license": "MIT",
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.8",
+        "es-set-tostringtag": "^2.1.0",
+        "hasown": "^2.0.2",
+        "mime-types": "^2.1.12"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/form-data/node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/form-data/node_modules/mime-types": {
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "1.52.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/forwarded": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -379,6 +503,21 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/has-tostringtag": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.2.tgz",
+      "integrity": "sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw==",
+      "license": "MIT",
+      "dependencies": {
+        "has-symbols": "^1.0.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/hasown": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.2.tgz",
@@ -561,9 +700,9 @@
       }
     },
     "node_modules/path-to-regexp": {
-      "version": "8.3.0",
+      "version": "8.4.2",
-      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-8.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-8.4.2.tgz",
-      "integrity": "sha512-7jdwVIRtsP8MYpdXSwOS0YdD0Du+qOoF/AEPIt88PcCFrZCzx41oxku1jD88hZBwbNUIEfpqvuhjFaMAqMTWnA==",
+      "integrity": "sha512-qRcuIdP69NPm4qbACK+aDogI5CBDMi1jKe0ry5rSQJz8JVLsC7jV8XpiJjGRLLol3N+R5ihGYcrPLTno6pAdBA==",
       "license": "MIT",
       "funding": {
         "type": "opencollective",
@@ -583,6 +722,15 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/proxy-from-env": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-2.1.0.tgz",
+      "integrity": "sha512-cJ+oHTW1VAEa8cJslgmUZrc+sjRKgAKl3Zyse6+PV38hZe/V6Z14TbCuXcan9F9ghlz4QrFr2c92TNF82UkYHA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/qs": {
       "version": "6.15.0",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.15.0.tgz",

backend/package.json

@@ -2,6 +2,7 @@
   "name": "backend",
   "version": "1.0.0",
   "main": "server.js",
+  "type": "module",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "start": "node server.js"
@@ -11,6 +12,8 @@
   "license": "ISC",
   "description": "",
   "dependencies": {
+    "axios": "^1.15.0",
+    "dotenv": "^17.4.2",
     "express": "^5.2.1"
   }
-}
+}

backend/server.js

@@ -1,7 +1,196 @@
 import express from "express";
-
+import dotenv from "dotenv";
+import axios from "axios";
+import { formatData } from "./formatter.js";
+dotenv.config();
 const app = express();
 
+app.use(express.json());
+
+app.get("/api/get-timetable/", async (req, res) => {
+  const username = req.query.username; // required
+  const password = req.query.password; // required
+  const school = req.query.school; // required
+
+  if (!username || !password || !school) {
+    res.status(400).json({
+      error: "Missing required query params: username, password, school",
+    });
+    return;
+  }
+
+  let startDate = req.query.startDate; // optional - expected format: YYYYMMDD
+  let endDate = req.query.endDate; // optional - expected format: YYYYMMDD
+
+  let sessionId = ""; // will be set after authentication by server response
+  let personId = ""; // will be set after authentication by server response
+  let personType = ""; // will be set after authentication by server response
+
+  // static function for checking or/and generating start and end date for the current week
+  function setDates() {
+    if (startDate && endDate) {
+      return;
+    }
+
+    const now = new Date();
+    const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
+    const dayOfWeek = today.getDay(); // 0 (Sunday) to 6 (Saturday)
+
+    const addDays = (date, days) =>
+      new Date(date.getFullYear(), date.getMonth(), date.getDate() + days);
+
+    // format dates to YYYYMMDD
+    const formatDate = (date) => {
+      const year = date.getFullYear();
+      const month = String(date.getMonth() + 1).padStart(2, "0");
+      const day = String(date.getDate()).padStart(2, "0");
+      return `${year}${month}${day}`;
+    };
+
+    // Desired behavior:
+    // - Weekday (Mon-Thu): startDate = today, endDate = coming Friday (same week)
+    // - Friday: startDate = today, endDate = coming Friday (next week)
+    // - Weekend (Sat/Sun): startDate = coming Monday, endDate = coming Friday (of that week)
+    const isWeekend = dayOfWeek === 0 || dayOfWeek === 6;
+
+    let start;
+    let end;
+
+    if (isWeekend) {
+      const daysUntilMonday = dayOfWeek === 0 ? 1 : 2; // Sun->Mon:1, Sat->Mon:2
+      start = addDays(today, daysUntilMonday);
+      end = addDays(start, 4); // Monday + 4 days = Friday
+    } else {
+      start = today;
+      const daysUntilFriday = 5 - dayOfWeek; // Mon(1)->4 ... Fri(5)->0
+      end = addDays(today, daysUntilFriday === 0 ? 7 : daysUntilFriday);
+    }
+
+    startDate = formatDate(start);
+    endDate = formatDate(end);
+  }
+
+  setDates();
+
+  const baseUrl = `https://${school}.webuntis.com/WebUntis/jsonrpc.do?school=${school}`;
+
+  const toJsonRpcError = (data) => {
+    const err = data?.error;
+    if (!err) return null;
+    const code = err.code;
+    const message = err.message || "Unknown WebUntis error";
+    return { code, message };
+  };
+
+  try {
+    // 1) authenticate
+    const authResponse = await axios.post(baseUrl, {
+      id: "1",
+      method: "authenticate",
+      params: {
+        user: username,
+        password: password,
+        client: "watch-untis",
+      },
+      jsonrpc: "2.0",
+    });
+
+    const authErr = toJsonRpcError(authResponse.data);
+    if (authErr) {
+      if (authErr.message === "bad credentials") {
+        res.status(401).json({ error: "Invalid username or password" });
+        return;
+      }
+      if (authErr.code === -8504) {
+        res.status(403).json({ error: "WebUntis Error: -8504" });
+        return;
+      }
+      res.status(502).json({ error: authErr.message, code: authErr.code });
+      return;
+    }
+
+    sessionId = authResponse.data?.result?.sessionId;
+    personId = authResponse.data?.result?.personId;
+    personType = authResponse.data?.result?.personType;
+    if (!sessionId || !personId) {
+      res.status(502).json({
+        error: "WebUntis auth succeeded but returned no sessionId/personId",
+      });
+      return;
+    }
+
+    // 2) get timetable (after we have sessionId, personId & personType from auth response)
+    const timetableResponse = await axios.post(
+      baseUrl,
+      {
+        id: "3",
+        method: "getTimetable",
+        params: {
+          options: {
+            element: {
+              id: personId,
+              type: personType,
+            },
+            startDate,
+            endDate,
+            teacherFields: ["id", "name", "longname"],
+            subjectFields: ["id", "name", "longname"],
+            roomFields: ["id", "name", "longname"],
+          },
+        },
+        jsonrpc: "2.0",
+      },
+      {
+        headers: {
+          Cookie: `JSESSIONID=${sessionId}`,
+        },
+      },
+    );
+
+    const timetableErr = toJsonRpcError(timetableResponse.data);
+    if (timetableErr) {
+      res
+        .status(502)
+        .json({ error: timetableErr.message, code: timetableErr.code });
+      return;
+    }
+
+    // 3) format the data once it successfully returned
+    try {
+      const formattedData = formatData(timetableResponse.data);
+      res.json(formattedData);
+    } catch (formatError) {
+      console.error("formatData failed", formatError);
+      res.status(500).json({ error: "Failed to format timetable data" });
+    }
+  } catch (error) {
+    const status = error?.response?.status;
+    const data = error?.response?.data;
+    const jsonRpcErr = toJsonRpcError(data);
+
+    if (jsonRpcErr?.message === "bad credentials") {
+      res.status(401).json({ error: "Invalid username or password" });
+      return;
+    }
+    if (jsonRpcErr?.code === -8504) {
+      res.status(403).json({ error: "WebUntis Error: -8504" });
+      return;
+    }
+
+    console.error(error);
+    res.status(502).json({
+      error: "Failed to fetch timetable",
+      upstreamStatus: status,
+    });
+  }
+});
+
+// error handling code
+app.use((err, req, res, next) => {
+  console.error(err.stack);
+  res.status(500).send("Something broke!");
+});
+
 app.listen(8001, () => {
   console.log("Server is running on port 8001");
 });

icon/icon_watch-untis.icon/icon.json

@@ -0,0 +1,80 @@
+{
+  "fill" : {
+    "automatic-gradient" : "display-p3:0.92690,0.41724,0.26206,1.00000"
+  },
+  "groups" : [
+    {
+      "layers" : [
+        {
+          "fill-specializations" : [
+            {
+              "value" : {
+                "solid" : "srgb:0.00000,0.00000,0.00000,1.00000"
+              }
+            },
+            {
+              "appearance" : "dark",
+              "value" : {
+                "solid" : "display-p3:0.36878,0.45148,0.50999,1.00000"
+              }
+            },
+            {
+              "appearance" : "tinted",
+              "value" : {
+                "solid" : "srgb:1.00000,1.00000,1.00000,1.00000"
+              }
+            }
+          ],
+          "image-name" : "Unbenannt-8.png",
+          "name" : "Unbenannt-8",
+          "position" : {
+            "scale" : 0.75,
+            "translation-in-points" : [
+              0.375,
+              -258
+            ]
+          }
+        },
+        {
+          "fill-specializations" : [
+            {
+              "appearance" : "dark",
+              "value" : {
+                "solid" : "display-p3:0.36878,0.45148,0.50999,1.00000"
+              }
+            },
+            {
+              "appearance" : "tinted",
+              "value" : {
+                "solid" : "srgb:1.00000,1.00000,1.00000,1.00000"
+              }
+            }
+          ],
+          "image-name" : "Unbenannt-7.png",
+          "name" : "Unbenannt-7",
+          "position" : {
+            "scale" : 0.6,
+            "translation-in-points" : [
+              0,
+              179
+            ]
+          }
+        }
+      ],
+      "shadow" : {
+        "kind" : "neutral",
+        "opacity" : 0.5
+      },
+      "translucency" : {
+        "enabled" : true,
+        "value" : 0.5
+      }
+    }
+  ],
+  "supported-platforms" : {
+    "circles" : [
+      "watchOS"
+    ],
+    "squares" : "shared"
+  }
+}

mock/mock.json

@@ -0,0 +1,40 @@
+{
+    "subjects": [
+        {
+            "lesson_nr": "1.",
+            "name": "D G2",
+            "room": "255",
+            "teacher": "VanC",
+            "clock": "08:00-08:55",
+            "cancelled": false
+        },
+        {
+            "lesson_nr": "2. & 3.",
+            "name": "M G2",
+            "room": "255",
+            "teacher": "ScLa",
+            "clock": "08:55-10:25",
+            "cancelled": false
+        },
+        {
+            "lesson_nr": "4.",
+            "name": "E G4",
+            "room": "254",
+            "teacher": "RadF",
+            "clock": "10:55-11:40",
+            "cancelled": false
+        },
+        {
+            "lesson_nr": "5.",
+            "name": "CH G2",
+            "room": "133",
+            "teacher": "LenT",
+            "clock": "11:40-12:25",
+            "cancelled": true
+        }
+    ],
+    "date": "15.04.2026",
+    "day": "Mittwoch",
+    "week": "16",
+    "student": "Max Mustermann"
+}

watch-untis.xcodeproj/xcuserdata/theis.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>SchemeUserState</key>
-	<dict>
-		<key>watch-untis Watch App.xcscheme_^#shared#^_</key>
-		<dict>
-			<key>orderHint</key>
-			<integer>0</integer>
-		</dict>
-	</dict>
-</dict>
-</plist>