104 lines
2.6 KiB
Dart
104 lines
2.6 KiB
Dart
import 'package:flutter_timezone/flutter_timezone.dart';
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import 'package:timezone/data/latest.dart' as tzdata;
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import 'package:timezone/timezone.dart' as tz;
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class TimeService {
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static const String estLocationName = 'America/New_York';
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static bool _initialized = false;
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static Future<void> initialize() async {
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if (_initialized) {
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return;
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}
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tzdata.initializeTimeZones();
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final localName = await FlutterTimezone.getLocalTimezone();
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tz.setLocalLocation(tz.getLocation(localName));
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_initialized = true;
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}
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static tz.Location get est => tz.getLocation(estLocationName);
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static tz.TZDateTime estNow() => tz.TZDateTime.now(est);
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static DateTime localNow() => tz.TZDateTime.now(tz.local);
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static tz.TZDateTime estDeadlinePassedAt(int year, int month) {
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return tz.TZDateTime(est, year, month, 2, 0, 0);
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}
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static tz.TZDateTime estFirstReminderAt(int year, int month) {
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return tz.TZDateTime(est, year, month, 2, 0, 5);
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}
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static bool isOnTimeByDeadline(DateTime paidAtUtc, int year, int month) {
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final estPaidAt = tz.TZDateTime.from(paidAtUtc, est);
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final cutoff = tz.TZDateTime(est, year, month, 1, 23, 59, 59, 999);
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return !estPaidAt.isAfter(cutoff);
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}
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static DateTime applyQuietHours({
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required DateTime localTime,
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required int quietHourStart,
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required int fallbackHour,
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}) {
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if (localTime.hour >= quietHourStart) {
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return DateTime(
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localTime.year,
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localTime.month,
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localTime.day + 1,
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fallbackHour,
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);
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}
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return localTime;
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}
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static DateTime nextEligibleLocal({
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required DateTime candidate,
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required int quietHourStart,
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required int fallbackHour,
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}) {
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final now = localNow();
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var result = candidate;
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if (result.isBefore(now)) {
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result = now.add(const Duration(minutes: 1));
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}
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if (result.hour >= quietHourStart) {
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result = DateTime(
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result.year,
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result.month,
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result.day + 1,
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fallbackHour,
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);
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}
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return result;
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}
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static bool monthAtOrAfter({
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required int year,
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required int month,
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required int pivotYear,
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required int pivotMonth,
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}) {
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return year > pivotYear || (year == pivotYear && month >= pivotMonth);
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}
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static bool monthBefore({
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required int year,
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required int month,
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required int otherYear,
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required int otherMonth,
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}) {
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return year < otherYear || (year == otherYear && month < otherMonth);
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}
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static String monthKey(int year, int month) {
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return '$year-${month.toString().padLeft(2, '0')}';
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}
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}
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