Intégration fonctionnalites V1

lib/core/time/server_time.dart

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+import 'package:intl/intl.dart';
+import 'package:timezone/data/latest.dart' as tz_data;
+import 'package:timezone/timezone.dart' as tz;
+
+/// Heure métier alignée sur le fuseau du serveur API (pas l'UTC ni le téléphone).
+abstract final class ServerTime {
+  static const defaultTimezone = 'Europe/Paris';
+
+  static bool _initialized = false;
+  static tz.Location _location = tz.UTC;
+
+  static Future<void> initialize({String timezone = defaultTimezone}) async {
+    if (!_initialized) {
+      tz_data.initializeTimeZones();
+      _initialized = true;
+    }
+    setTimezone(timezone);
+  }
+
+  static void setTimezone(String timezone) {
+    if (!_initialized) {
+      tz_data.initializeTimeZones();
+      _initialized = true;
+    }
+    _location = tz.getLocation(timezone);
+  }
+
+  static String get timezone => _location.name;
+
+  static tz.TZDateTime now() => tz.TZDateTime.now(_location);
+
+  static DateTime startOfToday() {
+    final current = now();
+    return DateTime(current.year, current.month, current.day);
+  }
+
+  static DateTime? parse(String? iso) {
+    if (iso == null || iso.isEmpty) {
+      return null;
+    }
+    return DateTime.tryParse(iso);
+  }
+
+  static tz.TZDateTime toServerTime(DateTime dateTime) {
+    return tz.TZDateTime.from(dateTime.toUtc(), _location);
+  }
+
+  static String format(
+    DateTime? dateTime, {
+    required String pattern,
+    String locale = 'fr_FR',
+  }) {
+    if (dateTime == null) {
+      return '';
+    }
+
+    final server = toServerTime(dateTime);
+    return DateFormat(pattern, locale).format(
+      DateTime(
+        server.year,
+        server.month,
+        server.day,
+        server.hour,
+        server.minute,
+        server.second,
+        server.millisecond,
+        server.microsecond,
+      ),
+    );
+  }
+}

lib/core/time/server_time_sync.dart

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+import 'package:dio/dio.dart';
+
+import '../api/api_endpoints.dart';
+import '../api/api_response.dart';
+import '../config/app_config.dart';
+import 'server_time.dart';
+
+/// Synchronise le fuseau horaire applicatif avec l'API (`/health`).
+Future<void> syncServerTimezone() async {
+  try {
+    final client = Dio(
+      BaseOptions(
+        baseUrl: kApiBaseUrl,
+        connectTimeout: const Duration(seconds: 5),
+        receiveTimeout: const Duration(seconds: 5),
+        headers: {'Accept': 'application/json'},
+      ),
+    );
+
+    final response = await client.get(ApiEndpoints.health);
+    final timezone = ApiResponse.payload(response.data)['timezone'];
+
+    if (timezone is String && timezone.isNotEmpty) {
+      ServerTime.setTimezone(timezone);
+    }
+  } catch (_) {
+    // Conserve le fuseau par défaut (Europe/Paris).
+  }
+}