feat: implement settings screen with reminders, biometrics, theme, and PDF export

- Daily reminder scheduling via flutter_local_notifications (inexact, repeating at chosen time) - Biometric lock gate on app launch with auto-prompt and manual unlock button - Theme mode selector (System/Light/Dark) persisted to settings DB - PDF export of full mood history shared via share_plus - Android: POST_NOTIFICATIONS, USE_BIOMETRIC permissions; switched to FlutterFragmentActivity
2026-04-26 15:49:52 +10:00
parent ffb0b427b7
commit 78aa032c1b
14 changed files with 460 additions and 18 deletions
@@ -0,0 +1,66 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:timezone/timezone.dart' as tz;
+
+class NotificationService {
+  static final _plugin = FlutterLocalNotificationsPlugin();
+  static bool _initialised = false;
+
+  static const _channelId = 'daily_reminder';
+  static const _notificationId = 0;
+
+  static Future<void> init() async {
+    if (_initialised) return;
+    const android = AndroidInitializationSettings('@mipmap/ic_launcher');
+    await _plugin.initialize(
+      settings: const InitializationSettings(android: android),
+    );
+    _initialised = true;
+  }
+
+  static Future<bool> requestPermission() async {
+    final android = _plugin.resolvePlatformSpecificImplementation<
+        AndroidFlutterLocalNotificationsPlugin>();
+    return (await android?.requestNotificationsPermission()) ?? false;
+  }
+
+  static Future<void> scheduleDaily(TimeOfDay time) async {
+    await _plugin.cancelAll();
+    const details = NotificationDetails(
+      android: AndroidNotificationDetails(
+        _channelId,
+        'Daily reminder',
+        channelDescription: 'Reminds you to log your mood',
+        importance: Importance.defaultImportance,
+        priority: Priority.defaultPriority,
+      ),
+    );
+    await _plugin.zonedSchedule(
+      id: _notificationId,
+      title: 'DailyYou',
+      body: 'Time to log your mood!',
+      scheduledDate: _nextInstanceOfTime(time.hour, time.minute),
+      notificationDetails: details,
+      androidScheduleMode: AndroidScheduleMode.inexactAllowWhileIdle,
+      matchDateTimeComponents: DateTimeComponents.time,
+    );
+  }
+
+  static Future<void> cancelAll() => _plugin.cancelAll();
+
+  static tz.TZDateTime _nextInstanceOfTime(int hour, int minute) {
+    final now = tz.TZDateTime.now(tz.UTC);
+    final offset = DateTime.now().timeZoneOffset;
+    var targetMinutes = hour * 60 + minute - offset.inMinutes;
+    // Normalise into [0, 24*60)
+    targetMinutes = ((targetMinutes % (24 * 60)) + 24 * 60) % (24 * 60);
+    final utcHour = targetMinutes ~/ 60;
+    final utcMin = targetMinutes % 60;
+    var scheduled =
+        tz.TZDateTime(tz.UTC, now.year, now.month, now.day, utcHour, utcMin);
+    if (scheduled.isBefore(now)) {
+      scheduled = scheduled.add(const Duration(days: 1));
+    }
+    return scheduled;
+  }
+}