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✨ Lunar calendar festivals

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This commit is contained in:
LittleSheep
2025-01-04 21:49:48 +08:00
parent d06df3d278
commit 9c3b61ce57
6 changed files with 82 additions and 2 deletions
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50
lib/providers/special_day.dart
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@ -3,9 +3,12 @@ import 'package:provider/provider.dart';
import 'package:surface/providers/userinfo.dart';
// Stored as key: month, day
const Map<String, (int, int)> kSpecialDays = {
final Map<String, (int, int)> kSpecialDays = {
// Birthday is dynamically generated according to the user's profile
'NewYear': (1, 1),
'LunarNewYear': (lunarToGregorian(null, 1, 1).month, lunarToGregorian(null, 1, 1).day),
'MidAutumn': (lunarToGregorian(null, 8, 15).month, lunarToGregorian(null, 8, 15).day),
'DragonBoat': (lunarToGregorian(null, 5, 5).month, lunarToGregorian(null, 5, 5).day),
'ValentineDay': (2, 14),
'LaborDay': (5, 1),
'MotherDay': (5, 11),
@ -19,6 +22,9 @@ const Map<String, (int, int)> kSpecialDays = {
const Map<String, String> kSpecialDaysSymbol = {
'Birthday': '🎂',
'NewYear': '🎉',
'LunarNewYear': '🎉',
'MidAutumn': '🥮',
'DragonBoat': '🐲',
'MerryXmas': '🎄',
'ValentineDay': '💑',
'LaborDay': '🏋️',
@ -134,3 +140,45 @@ class SpecialDayProvider {
return (elapsedDuration / totalDuration).clamp(0.0, 1.0);
}
}
final Map<int, LunarYear> lunarYearData = {
2025: LunarYear(
startDate: DateTime(2025, 1, 29),
months: [29, 30, 30, 29, 30, 29, 29, 30, 30, 29, 30, 29],
leapMonth: 0,
),
};
class LunarYear {
final DateTime startDate;
final List<int> months;
final int leapMonth;
LunarYear({required this.startDate, required this.months, required this.leapMonth});
}
DateTime lunarToGregorian(int? year, int month, int day, {bool isLeapMonth = false}) {
year = year ?? DateTime.now().year;
final lunarYear = lunarYearData[year];
if (lunarYear == null) {
throw Exception('Lunar data for year $year not found');
}
int leapMonth = lunarYear.leapMonth;
if (isLeapMonth && (leapMonth == 0 || leapMonth != month)) {
throw Exception('Invalid leap month for year $year');
}
int daysFromStart = 0;
for (int i = 0; i < month - 1; i++) {
daysFromStart += lunarYear.months[i];
}
if (isLeapMonth) {
daysFromStart += lunarYear.months[month - 1];
}
daysFromStart += day - 1;
return lunarYear.startDate.add(Duration(days: daysFromStart));
}