From 75b5944d12506ee42404b4fb4801072a054a63c9 Mon Sep 17 00:00:00 2001
From: Dicken <dicken@noreply.localhost>
Date: Tue, 26 May 2026 14:36:24 +0200
Subject: [PATCH] Dateien nach "frontend/src" hochladen

---
 frontend/src/calendar.jsx | 84 ++++++++++++++++++++++++++-------------
 1 file changed, 56 insertions(+), 28 deletions(-)

diff --git a/frontend/src/calendar.jsx b/frontend/src/calendar.jsx
index 9ed476e..d77b041 100644
--- a/frontend/src/calendar.jsx
+++ b/frontend/src/calendar.jsx
@@ -2,38 +2,66 @@
 import { useState, useEffect, useMemo } from 'react';
 import { api, S } from './lib.js';
 
-// Minimaler iCal-Parser (VEVENT Felder)
-function parseIcal(text) {
+// iCal-Parser – unterstützt gefaltete Zeilen, TZID, VALUE=DATE
+function parseIcal(raw) {
+  // 1. Gefaltete Zeilen (RFC 5545) zusammenführen
+  const text = raw.replace(/\r\n[ \t]/g, '').replace(/\r/g, '');
+
+  // 2. Alle Properties als Map extrahieren
+  function getProps(block) {
+    const props = {};
+    for (const line of block.split('\n')) {
+      const col = line.indexOf(':');
+      if (col < 0) continue;
+      const namepart = line.slice(0, col).toUpperCase();
+      const val = line.slice(col + 1).trim();
+      // Basisname ohne Parameter
+      const name = namepart.split(';')[0];
+      // TZID-Parameter extrahieren
+      const tzidM = namepart.match(/TZID=([^;:]+)/);
+      props[name] = { val, raw: namepart, tzid: tzidM?.[1] || null };
+    }
+    return props;
+  }
+
+  // 3. Datum parsen – Ortszeit wenn TZID gesetzt, UTC wenn Z-Suffix
+  function parseDate(prop, isEnd) {
+    if (!prop) return null;
+    const s = prop.val;
+    if (!s) return null;
+    const allDay = s.length === 8 || prop.raw.includes('VALUE=DATE');
+    if (allDay) {
+      // DTEND bei all-day ist exklusiv → einen Tag abziehen
+      const d = new Date(+s.slice(0,4), +s.slice(4,6)-1, +s.slice(6,8));
+      if (isEnd) d.setDate(d.getDate() - 1);
+      return { date: d, allDay: true };
+    }
+    const utc = s.endsWith('Z');
+    const y=+s.slice(0,4), mo=+s.slice(4,6)-1, d=+s.slice(6,8);
+    const h=+s.slice(9,11)||0, mi=+s.slice(11,13)||0, sec=+s.slice(13,15)||0;
+    const date = utc
+      ? new Date(Date.UTC(y,mo,d,h,mi,sec))
+      : new Date(y,mo,d,h,mi,sec); // Ortszeit des Browsers (beste Annäherung)
+    return { date, allDay: false };
+  }
+
   const events = [];
   const blocks = text.split('BEGIN:VEVENT');
   for (let i = 1; i < blocks.length; i++) {
-    const b = blocks[i];
-    const get = (key) => {
-      const m = b.match(new RegExp(`${key}(?:;[^:]*)?:([^\r\n]+)`, 'i'));
-      return m ? m[1].trim() : '';
-    };
-    const parseDate = (s) => {
-      if (!s) return null;
-      // Remove VALUE=DATE: prefix handling
-      const clean = s.replace(/^[^:]*:/,'');
-      if (clean.length === 8) {
-        // all-day: YYYYMMDD
-        return new Date(+clean.slice(0,4), +clean.slice(4,6)-1, +clean.slice(6,8));
-      }
-      // datetime: YYYYMMDDTHHMMSSZ
-      return new Date(
-        Date.UTC(+clean.slice(0,4), +clean.slice(4,6)-1, +clean.slice(6,8),
-                 +clean.slice(9,11)||0, +clean.slice(11,13)||0, +clean.slice(13,15)||0)
-      );
-    };
-    const dtstart = parseDate(get('DTSTART'));
-    const dtend   = parseDate(get('DTEND')) || dtstart;
-    if (!dtstart || isNaN(dtstart)) continue;
+    const end = blocks[i].indexOf('END:VEVENT');
+    const block = end >= 0 ? blocks[i].slice(0, end) : blocks[i];
+    const p = getProps(block);
+
+    const startObj = parseDate(p['DTSTART']);
+    const endObj   = parseDate(p['DTEND'], true) || startObj;
+    if (!startObj || isNaN(startObj.date)) continue;
+
     events.push({
-      summary:  get('SUMMARY')  || '(kein Titel)',
-      location: get('LOCATION') || '',
-      dtstart, dtend,
-      allDay: (get('DTSTART') || '').replace(/^[^:]*:/,'').length === 8,
+      summary:  (p['SUMMARY']?.val  || '(kein Titel)').replace(/\\n/g,'\n').replace(/\\,/g,','),
+      location: (p['LOCATION']?.val || '').replace(/\\n/g,'\n').replace(/\\,/g,','),
+      dtstart:  startObj.date,
+      dtend:    endObj.date,
+      allDay:   startObj.allDay,
     });
   }
   return events;