feat: condivisione piano pasti via QR code

Porta la funzionalità QR code dalla versione Vue a Flutter. Condividi: pulsante in fondo alla tab Pasti (attivo solo con piano non vuoto) → bottom sheet con QR code generato da qr_flutter. Payload: { "v": 1, "meals": { ... } }, limite 2953 byte. Ricevi: pulsante sempre visibile → QrScanPage full-screen con fotocamera via mobile_scanner, cornice di mira, validazione struttura JSON e importazione via MealPlannerProvider.importPlan(). Nuovi package: qr_flutter ^4.1.0, mobile_scanner ^5.0.0 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-17 23:09:16 +02:00
parent 404a5f44ac
commit cebeaf889a
5 changed files with 255 additions and 0 deletions
@@ -0,0 +1,120 @@
+import 'dart:convert';
+import 'package:flutter/material.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:provider/provider.dart';
+import '../../models/meal_plan.dart';
+import '../../providers/meal_planner_provider.dart';
+import '../../../../core/constants/app_constants.dart';
+
+class QrScanPage extends StatefulWidget {
+  const QrScanPage({super.key});
+
+  @override
+  State<QrScanPage> createState() => _QrScanPageState();
+}
+
+class _QrScanPageState extends State<QrScanPage> {
+  bool _handled = false;
+
+  void _onDetect(BarcodeCapture capture, BuildContext context) {
+    if (_handled) return;
+    final raw = capture.barcodes.firstOrNull?.rawValue;
+    if (raw == null) return;
+
+    setState(() => _handled = true);
+
+    try {
+      final parsed = jsonDecode(raw) as Map<String, dynamic>;
+      if (parsed['v'] != 1 || parsed['meals'] is! Map) {
+        _showError(context, 'QR non valido: dati non riconosciuti.');
+        return;
+      }
+      final mealsMap = parsed['meals'] as Map<String, dynamic>;
+      for (final day in kDayIds) {
+        final dayData = mealsMap[day];
+        if (dayData is! Map) {
+          _showError(context, 'QR non valido: struttura dati errata.');
+          return;
+        }
+        for (final slot in kMealSlots) {
+          if (dayData[slot] is! List) {
+            _showError(context, 'QR non valido: struttura dati errata.');
+            return;
+          }
+        }
+      }
+
+      final plan = MealPlan(Map.fromEntries(
+        kDayIds.map((day) {
+          final d = mealsMap[day] as Map<String, dynamic>;
+          return MapEntry(
+            day,
+            DayPlan(
+              colazione: List<String>.from(d['colazione'] as List),
+              pranzo: List<String>.from(d['pranzo'] as List),
+              cena: List<String>.from(d['cena'] as List),
+            ),
+          );
+        }),
+      ));
+
+      context.read<MealPlannerProvider>().importPlan(plan);
+
+      if (context.mounted) {
+        Navigator.pop(context);
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(content: Text('Piano ricevuto!')),
+        );
+      }
+    } catch (_) {
+      _showError(context, 'QR non riconosciuto.');
+    }
+  }
+
+  void _showError(BuildContext context, String msg) {
+    if (!context.mounted) return;
+    Navigator.pop(context);
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(msg),
+        backgroundColor: Theme.of(context).colorScheme.error,
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+
+    return Scaffold(
+      appBar: AppBar(title: const Text('Scansiona QR')),
+      body: Stack(
+        children: [
+          MobileScanner(
+            onDetect: (capture) => _onDetect(capture, context),
+          ),
+          // cornice di mira
+          Center(
+            child: Container(
+              width: 220,
+              height: 220,
+              decoration: BoxDecoration(
+                border: Border.all(color: scheme.primary, width: 3),
+                borderRadius: BorderRadius.circular(12),
+              ),
+            ),
+          ),
+          Positioned(
+            bottom: 40,
+            left: 0, right: 0,
+            child: Text(
+              'Inquadra il codice QR dell\'altro dispositivo',
+              textAlign: TextAlign.center,
+              style: const TextStyle(color: Colors.white, fontSize: 14),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}