adding multitimezone

2026-10-03 15:00:55 +05:30
parent cce6bb2ccb
commit 881a665f14
11 changed files with 805 additions and 8 deletions
@@ -0,0 +1,179 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:timezone/timezone.dart' as tz;
+
+/// Single source of truth for time-zone display prefs (v1: local-only).
+/// Mirrors LocaleProvider: ChangeNotifier + SharedPreferences + notifyListeners.
+/// Backend sync (AppUser.multitime) is a later phase; for now prefs stay on-device
+/// so the settings card in the screenshot works standalone + multilingual.
+class TimezoneProvider with ChangeNotifier {
+  static const _zoneKey = 'app_timezone_id';
+  static const _patternKey = 'app_date_pattern';
+  static const _is24hKey = 'app_time_24h';
+  static const _weekStartKey = 'app_week_start';
+
+  /// Curated quick-pick list matching the settings mock.
+  static const commonZoneIds = [
+    'Asia/Kolkata',
+    'Asia/Dubai',
+    'Asia/Singapore',
+    'Asia/Kuala_Lumpur',
+    'Asia/Hong_Kong',
+    'Asia/Shanghai',
+    'Asia/Taipei',
+    'Asia/Tokyo',
+    'Asia/Seoul',
+    'Asia/Bangkok',
+    'Asia/Jakarta',
+    'Asia/Manila',
+    'Asia/Karachi',
+    'Europe/London',
+    'Europe/Paris',
+    'Europe/Berlin',
+    'America/New_York',
+    'America/Chicago',
+    'America/Denver',
+    'America/Los_Angeles',
+    'America/Toronto',
+    'Australia/Sydney',
+    'UTC',
+  ];
+
+  static const datePatterns = ['dd-MM-yyyy', 'MM-dd-yyyy', 'yyyy-MM-dd'];
+  static const weekDays = [
+    'Monday',
+    'Tuesday',
+    'Wednesday',
+    'Thursday',
+    'Friday',
+    'Saturday',
+    'Sunday',
+  ];
+
+  String _zoneId = 'Asia/Kolkata';
+  String get zoneId => _zoneId;
+
+  String _datePattern = 'dd-MM-yyyy';
+  String get datePattern => _datePattern;
+
+  bool _is24h = true;
+  bool get is24h => _is24h;
+
+  String _weekStart = 'Monday';
+  String get weekStart => _weekStart;
+
+  bool _ready = false;
+  bool get ready => _ready;
+
+  /// Short city label: 'Asia/Kolkata' -> 'Kolkata', 'UTC' -> 'UTC'.
+  static String cityOf(String id) {
+    if (id == 'UTC') return 'UTC';
+    final parts = id.split('/');
+    final raw = parts.isNotEmpty ? parts.last : id;
+    return raw.replaceAll('_', ' ');
+  }
+
+  Future<void> init() async {
+    final prefs = await SharedPreferences.getInstance();
+    final z = prefs.getString(_zoneKey);
+    if (z != null && z.isNotEmpty) _zoneId = z;
+    final p = prefs.getString(_patternKey);
+    if (p != null && datePatterns.contains(p)) _datePattern = p;
+    final h = prefs.getBool(_is24hKey);
+    if (h != null) _is24h = h;
+    final w = prefs.getString(_weekStartKey);
+    if (w != null && weekDays.contains(w)) _weekStart = w;
+    _ready = true;
+    notifyListeners();
+  }
+
+  Future<void> setZone(String id) async {
+    _zoneId = id;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_zoneKey, id);
+    notifyListeners();
+  }
+
+  Future<void> setDatePattern(String p) async {
+    if (!datePatterns.contains(p)) return;
+    _datePattern = p;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_patternKey, p);
+    notifyListeners();
+  }
+
+  Future<void> setIs24h(bool v) async {
+    _is24h = v;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool(_is24hKey, v);
+    notifyListeners();
+  }
+
+  Future<void> setWeekStart(String d) async {
+    if (!weekDays.contains(d)) return;
+    _weekStart = d;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_weekStartKey, d);
+    notifyListeners();
+  }
+
+  /// Explicit save (button in the mock). Values are already persisted on
+  /// change; this re-persists + notifies so callers can show a snackbar.
+  Future<void> save() async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_zoneKey, _zoneId);
+    await prefs.setString(_patternKey, _datePattern);
+    await prefs.setBool(_is24hKey, _is24h);
+    await prefs.setString(_weekStartKey, _weekStart);
+    notifyListeners();
+  }
+
+  tz.Location get location {
+    try {
+      return tz.getLocation(_zoneId);
+    } catch (_) {
+      return tz.getLocation('UTC');
+    }
+  }
+
+  tz.TZDateTime nowInZone() {
+    try {
+      return tz.TZDateTime.now(location);
+    } catch (_) {
+      return tz.TZDateTime.now(tz.getLocation('UTC'));
+    }
+  }
+
+  /// e.g. 'GMT+5:30', 'GMT-4:00', 'GMT'. DST-aware via timezone DB.
+  String offsetLabel([tz.TZDateTime? at]) {
+    try {
+      final dt = at ?? nowInZone();
+      final offset = dt.timeZoneOffset;
+      if (offset == Duration.zero) return 'GMT';
+      final sign = offset.isNegative ? '-' : '+';
+      final abs = offset.abs();
+      final h = abs.inHours.toString();
+      final m = (abs.inMinutes % 60).toString().padLeft(2, '0');
+      return 'GMT$sign$h:$m';
+    } catch (_) {
+      return '';
+    }
+  }
+
+  /// 'Kolkata (GMT+5:30)' style label for dropdown rows.
+  String displayLabel(String id) {
+    try {
+      final loc = tz.getLocation(id);
+      final now = tz.TZDateTime.now(loc);
+      final offset = now.timeZoneOffset;
+      final sign = offset.isNegative ? '-' : '+';
+      final abs = offset.abs();
+      final off = offset == Duration.zero
+          ? 'GMT'
+          : 'GMT$sign${abs.inHours}:${(abs.inMinutes % 60).toString().padLeft(2, '0')}';
+      return '${cityOf(id)} ($off)';
+    } catch (_) {
+      return cityOf(id);
+    }
+  }
+}