feat: export ICS

em2rp/lib/views/widgets/calendar_widgets/event_details_components/event_details_header.dart

@@ -5,6 +5,9 @@ import 'package:em2rp/utils/colors.dart';
 import 'package:provider/provider.dart';
 import 'package:em2rp/providers/local_user_provider.dart';
 import 'package:em2rp/views/event_add_page.dart';
+import 'package:em2rp/services/ics_export_service.dart';
+import 'dart:html' as html;
+import 'dart:convert';
 
 class EventDetailsHeader extends StatefulWidget {
   final EventModel event;
@@ -93,6 +96,12 @@ class _EventDetailsHeaderState extends State<EventDetailsHeader> {
         ),
         const SizedBox(width: 12),
         _buildStatusIcon(widget.event.status),
+        const SizedBox(width: 8),
+        IconButton(
+          icon: const Icon(Icons.calendar_today, color: AppColors.rouge),
+          tooltip: 'Exporter vers Google Calendar',
+          onPressed: _exportToCalendar,
+        ),
         if (Provider.of<LocalUserProvider>(context, listen: false)
             .hasPermission('edit_event')) ...[
           const SizedBox(width: 8),
@@ -112,6 +121,63 @@ class _EventDetailsHeaderState extends State<EventDetailsHeader> {
     );
   }
 
+  Future<void> _exportToCalendar() async {
+    try {
+      // Afficher un indicateur de chargement
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Row(
+            children: [
+              SizedBox(
+                width: 20,
+                height: 20,
+                child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white),
+              ),
+              SizedBox(width: 16),
+              Text('Génération du fichier ICS...'),
+            ],
+          ),
+          duration: Duration(seconds: 2),
+        ),
+      );
+
+      // Générer le contenu ICS
+      final icsContent = await IcsExportService.generateIcsContent(widget.event);
+      final fileName = IcsExportService.generateFileName(widget.event);
+
+      // Créer un blob et télécharger le fichier
+      final bytes = utf8.encode(icsContent);
+      final blob = html.Blob([bytes], 'text/calendar');
+      final url = html.Url.createObjectUrlFromBlob(blob);
+      html.AnchorElement(href: url)
+        ..setAttribute('download', fileName)
+        ..click();
+      html.Url.revokeObjectUrl(url);
+
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text('Événement exporté : $fileName'),
+          backgroundColor: Colors.green,
+          action: SnackBarAction(
+            label: 'OK',
+            textColor: Colors.white,
+            onPressed: () {},
+          ),
+        ),
+      );
+    } catch (e) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text('Erreur lors de l\'export : $e'),
+          backgroundColor: Colors.red,
+        ),
+      );
+    }
+  }
+
   Widget _buildStatusIcon(EventStatus status) {
     Color color;
     IconData icon;

em2rp/lib/views/widgets/event_form/event_basic_info_section.dart

@@ -181,16 +181,24 @@ class EventBasicInfoSection extends StatelessWidget {
   }
 
   Future<void> _selectStartDateTime(BuildContext context) async {
+    // Utiliser la date actuelle de l'événement ou aujourd'hui
+    final initialDate = startDateTime ?? DateTime.now();
+
     final picked = await showDatePicker(
       context: context,
-      initialDate: DateTime.now(),
+      initialDate: initialDate,
       firstDate: DateTime(2020),
       lastDate: DateTime(2099),
     );
     if (picked != null) {
+      // Utiliser l'heure actuelle de l'événement ou l'heure actuelle
+      final initialTime = startDateTime != null
+          ? TimeOfDay(hour: startDateTime!.hour, minute: startDateTime!.minute)
+          : TimeOfDay.now();
+
       final time = await showTimePicker(
         context: context,
-        initialTime: TimeOfDay.now(),
+        initialTime: initialTime,
       );
       if (time != null) {
         final newDateTime = DateTime(
@@ -206,16 +214,24 @@ class EventBasicInfoSection extends StatelessWidget {
   }
 
   Future<void> _selectEndDateTime(BuildContext context) async {
+    // Utiliser la date actuelle de fin ou date de début + 1h
+    final initialDate = endDateTime ?? startDateTime!.add(const Duration(hours: 1));
+
     final picked = await showDatePicker(
       context: context,
-      initialDate: startDateTime!.add(const Duration(hours: 1)),
+      initialDate: initialDate,
       firstDate: startDateTime!,
       lastDate: DateTime(2099),
     );
     if (picked != null) {
+      // Utiliser l'heure actuelle de l'événement ou l'heure actuelle
+      final initialTime = endDateTime != null
+          ? TimeOfDay(hour: endDateTime!.hour, minute: endDateTime!.minute)
+          : TimeOfDay.now();
+
       final time = await showTimePicker(
         context: context,
-        initialTime: TimeOfDay.now(),
+        initialTime: initialTime,
       );
       if (time != null) {
         final newDateTime = DateTime(