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// lib/utils/holidays_at.dart
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import 'helpers.dart'; // ymd(DateTime)
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DateTime _easterSunday(int year) {
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final a = year % 19;
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final b = year ~/ 100;
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final c = year % 100;
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final d = b ~/ 4;
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final e = b % 4;
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final f = ((b + 8) ~/ 25);
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final g = ((b - f + 1) ~/ 3);
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final h = (19 * a + b - d - g + 15) % 30;
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final i = c ~/ 4;
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final k = c % 4;
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final l = (32 + 2 * e + 2 * i - h - k) % 7;
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final m = ((a + 11 * h + 22 * l) ~/ 451);
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final month = ((h + l - 7 * m + 114) ~/ 31);
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final day = ((h + l - 7 * m + 114) % 31) + 1;
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return DateTime(year, month, day);
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}
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DateTime _addDays(DateTime d, int days) => DateTime(d.year, d.month, d.day + days);
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Map<String, String> buildHolidayMapAT(
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int year, {
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bool includeWeekends = false,
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}) {
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final Map<String, String> map = {};
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// setzt nur, wenn noch nichts gesetzt wurde (echte Feiertage sollen Vorrang haben)
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void putIfEmpty(DateTime date, String name) {
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final key = ymd(date);
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map.putIfAbsent(key, () => name);
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}
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// Bewegliche Feiertage
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final easter = _easterSunday(year);
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// (Karfreitag ist in AT nicht generell arbeitsfrei – ggf. entfernen)
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putIfEmpty(_addDays(easter, -2), 'Karfreitag');
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putIfEmpty(_addDays(easter, 1), 'Ostermontag');
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putIfEmpty(_addDays(easter, 39), 'Christi Himmelfahrt');
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putIfEmpty(_addDays(easter, 50), 'Pfingstmontag');
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putIfEmpty(_addDays(easter, 60), 'Fronleichnam');
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// Feste Feiertage
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putIfEmpty(DateTime(year, 1, 1), 'Neujahr');
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putIfEmpty(DateTime(year, 1, 6), 'Heilige Drei Könige');
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putIfEmpty(DateTime(year, 5, 1), 'Staatsfeiertag');
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putIfEmpty(DateTime(year, 8, 15), 'Mariä Himmelfahrt');
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putIfEmpty(DateTime(year, 10, 26), 'Nationalfeiertag');
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putIfEmpty(DateTime(year, 11, 1), 'Allerheiligen');
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putIfEmpty(DateTime(year, 12, 8), 'Mariä Empfängnis');
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putIfEmpty(DateTime(year, 12, 25), 'Christtag');
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putIfEmpty(DateTime(year, 12, 26), 'Stefanitag');
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// Optional: Wochenenden **nur ergänzen**, aber niemals Feiertage überschreiben
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if (includeWeekends) {
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DateTime d = DateTime(year, 1, 1);
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while (d.year == year) {
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final wd = d.weekday;
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if (wd == DateTime.saturday || wd == DateTime.sunday) {
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final key = ymd(d);
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if (!map.containsKey(key)) {
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putIfEmpty(d, wd == DateTime.saturday ? 'Samstag' : 'Sonntag');
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}
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}
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d = d.add(const Duration(days: 1));
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}
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}
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return map;
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}
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