Initial commit

lib/services/notification_service.dart

@@ -0,0 +1,74 @@
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:timezone/timezone.dart' as tz;
+import 'package:timezone/data/latest.dart' as tz_data;
+import '../database/database_helper.dart';
+
+class NotificationService {
+  static final NotificationService instance = NotificationService._init();
+  final FlutterLocalNotificationsPlugin _plugin = FlutterLocalNotificationsPlugin();
+  bool _initialized = false;
+
+  NotificationService._init();
+
+  Future<void> init() async {
+    if (_initialized) return;
+    tz_data.initializeTimeZones();
+    const androidSettings = AndroidInitializationSettings('@mipmap/ic_launcher');
+    const settings = InitializationSettings(android: androidSettings);
+    await _plugin.initialize(settings);
+    _initialized = true;
+  }
+
+  Future<void> scheduleRecordatorios() async {
+    await _plugin.cancelAll();
+    final db = DatabaseHelper.instance;
+    final facturas = await db.getFacturas(estado: 'Pendiente');
+    final config = await db.getConfiguracion();
+    final diasStr = config?.diasRecordatorio ?? '7,3,1,0';
+    final dias = diasStr.split(',').map((e) => int.tryParse(e.trim()) ?? 0).toList();
+
+    for (final factura in facturas) {
+      final vencimiento = DateTime.tryParse(factura.fechaVencimiento);
+      if (vencimiento == null) continue;
+      for (final dia in dias) {
+        final notifDate = vencimiento.subtract(Duration(days: dia));
+        final now = DateTime.now();
+        if (notifDate.isAfter(now) || notifDate.day == now.day) {
+          await _scheduleNotification(
+            id: factura.id! * 10 + dia,
+            title: dia == 0 ? 'Factura vence hoy' : 'Recordatorio de factura',
+            body: 'La factura vence en $dia día(s)',
+            scheduledDate: notifDate,
+          );
+        }
+      }
+    }
+  }
+
+  Future<void> _scheduleNotification({
+    required int id,
+    required String title,
+    required String body,
+    required DateTime scheduledDate,
+  }) async {
+    const androidDetails = AndroidNotificationDetails(
+      'hogarcontrol_recordatorios',
+      'Recordatorios de facturas',
+      channelDescription: 'Notificaciones de recordatorio de pago',
+      importance: Importance.high,
+      priority: Priority.high,
+    );
+    const details = NotificationDetails(android: androidDetails);
+    final tzDate = tz.TZDateTime.from(scheduledDate, tz.local);
+    await _plugin.zonedSchedule(
+      id,
+      title,
+      body,
+      tzDate,
+      details,
+      androidScheduleMode: AndroidScheduleMode.inexactAllowWhileIdle,
+      matchDateTimeComponents: DateTimeComponents.dayOfMonthAndTime,
+      uiLocalNotificationDateInterpretation: UILocalNotificationDateInterpretation.absoluteTime,
+    );
+  }
+}