feat: cache data in home page

lib/controller/home_controller.dart

@@ -1,3 +1,4 @@
+import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:get/get.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -16,37 +17,224 @@ class HomeController extends GetxController {
   var latestNews = <Berita>[].obs;
   final RxList<CampusResponse> recommendedCampuses = <CampusResponse>[].obs;
   final locationService = LocationService(Get.context!);
+  final RxBool isLocationReady = false.obs;
+  final RxBool isLocationDenied = false.obs;
+
+  // Cache duration constants
+  static const campusCacheDuration = Duration(minutes: 30);
+  static const newsCacheDuration = Duration(minutes: 1);
+  static const locationThreshold = 0.01; // Roughly 1km difference
 
   @override
   void onInit() {
     super.onInit();
-    locationService.loadUserLocation();
-    locationService.updateLocation();
-    getAllCampusData();
-    getLatestNews();
-    fetchRecommendedCampuses();
+    initializeData();
+  }
+
+  Future<void> initializeData() async {
+    await loadCachedData();
+    await refreshDataIfNeeded();
+  }
+
+  Future<void> loadCachedData() async {
+    final prefs = await SharedPreferences.getInstance();
+
+    // Load campus data
+    final campusDataTime = DateTime.fromMillisecondsSinceEpoch(
+        prefs.getInt('campusDataTimestamp') ?? 0);
+
+    if (DateTime.now().difference(campusDataTime) < campusCacheDuration) {
+      final cachedTopCampus = prefs.getString('topCampusData');
+      if (cachedTopCampus != null) {
+        final topCampusData =
+            TopCampusList.fromJson(jsonDecode(cachedTopCampus));
+        ptnList.value = topCampusData.ptn;
+        politeknikList.value = topCampusData.politeknik;
+        swastaList.value = topCampusData.swasta;
+      }
+    }
+
+    // Load recommended campuses
+    final recommendedTime = DateTime.fromMillisecondsSinceEpoch(
+        prefs.getInt('recommendedTimestamp') ?? 0);
+    if (DateTime.now().difference(recommendedTime) < campusCacheDuration) {
+      final cachedRecommended = prefs.getString('recommendedCampuses');
+      if (cachedRecommended != null) {
+        List<dynamic> jsonList = jsonDecode(cachedRecommended);
+        recommendedCampuses.value =
+            jsonList.map((json) => CampusResponse.fromJson(json)).toList();
+      }
+    }
+
+    // Load news
+    final newsTime =
+        DateTime.fromMillisecondsSinceEpoch(prefs.getInt('newsTimestamp') ?? 0);
+    if (DateTime.now().difference(newsTime) < newsCacheDuration) {
+      final cachedNews = prefs.getString('latestNews');
+      if (cachedNews != null) {
+        List<dynamic> jsonList = jsonDecode(cachedNews);
+        latestNews.value =
+            jsonList.map((json) => Berita.fromJson(json)).toList();
+      }
+    }
+  }
+
+  Future<void> refreshDataIfNeeded() async {
+    final prefs = await SharedPreferences.getInstance();
+
+    // Check campus data cache
+    final lastCampusRefresh = DateTime.fromMillisecondsSinceEpoch(
+        prefs.getInt('campusDataTimestamp') ?? 0);
+    if (DateTime.now().difference(lastCampusRefresh) > campusCacheDuration) {
+      await getAllCampusData();
+    }
+
+    // Check news cache
+    final lastNewsRefresh =
+        DateTime.fromMillisecondsSinceEpoch(prefs.getInt('newsTimestamp') ?? 0);
+    if (DateTime.now().difference(lastNewsRefresh) > newsCacheDuration) {
+      await getLatestNews();
+    }
+
+    // Initialize location and recommended campuses
+    await initializeLocation();
   }
 
-  void getAllCampusData() async {
+  Future<bool> shouldUpdateLocation() async {
+    final prefs = await SharedPreferences.getInstance();
+    final oldLat = prefs.getDouble('lastLatitude');
+    final oldLng = prefs.getDouble('lastLongitude');
+    final currentLat = prefs.getDouble('userLatitude');
+    final currentLng = prefs.getDouble('userLongitude');
+
+    if (oldLat == null || oldLng == null) return true;
+    if (currentLat == null || currentLng == null) return true;
+
+    return (oldLat - currentLat).abs() > locationThreshold ||
+        (oldLng - currentLng).abs() > locationThreshold;
+  }
+
+  Future<void> initializeLocation() async {
+    try {
+      await locationService.loadUserLocation();
+      final hasPermission = await locationService.hasLocationPermission();
+
+      if (hasPermission) {
+        await locationService.updateLocation();
+        isLocationReady.value = true;
+
+        if (await shouldUpdateLocation()) {
+          await fetchRecommendedCampuses();
+
+          final prefs = await SharedPreferences.getInstance();
+          await prefs.setDouble(
+              'lastLatitude', prefs.getDouble('userLatitude') ?? 0);
+          await prefs.setDouble(
+              'lastLongitude', prefs.getDouble('userLongitude') ?? 0);
+        }
+      } else {
+        isLocationDenied.value = true;
+        await fetchDefaultRecommendations();
+      }
+    } catch (e) {
+      print('Error initializing location: $e');
+      isLocationDenied.value = true;
+      await fetchDefaultRecommendations();
+    }
+  }
+
+  Future<void> getAllCampusData() async {
     try {
       final result = await TopCampusProvider().getAllCampuses();
       ptnList.value = result.ptn;
       politeknikList.value = result.politeknik;
       swastaList.value = result.swasta;
+
+      // Cache the results
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setString('topCampusData', jsonEncode(result.toJson()));
+      await prefs.setInt(
+          'campusDataTimestamp', DateTime.now().millisecondsSinceEpoch);
     } catch (e) {
       print('Error fetching campus data: $e');
     }
   }
 
-  void getLatestNews() async {
+  Future<void> getLatestNews() async {
     try {
       var result = await NewsLatest().getBerita();
       latestNews.value = result;
+
+      // Cache the results
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setString(
+          'latestNews', jsonEncode(result.map((e) => e.toJson()).toList()));
+      await prefs.setInt(
+          'newsTimestamp', DateTime.now().millisecondsSinceEpoch);
     } catch (e) {
       print('Error fetching latest news: $e');
     }
   }
 
+  Future<void> fetchRecommendedCampuses() async {
+    if (!isLocationReady.value) return;
+
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      double? userLatitude = prefs.getDouble('userLatitude');
+      double? userLongitude = prefs.getDouble('userLongitude');
+
+      if (userLatitude == null || userLongitude == null) {
+        await fetchDefaultRecommendations();
+        return;
+      }
+
+      var campusService = ApiDataProvider();
+      var campuses = await campusService.getCampusesNearby(
+          latitude: userLatitude, longitude: userLongitude);
+
+      recommendedCampuses.value = campuses.take(4).toList();
+
+      // Cache the results
+      await prefs.setString('recommendedCampuses',
+          jsonEncode(recommendedCampuses.map((e) => e.toJson()).toList()));
+      await prefs.setInt(
+          'recommendedTimestamp', DateTime.now().millisecondsSinceEpoch);
+    } catch (e) {
+      print('Error fetching recommended campuses: $e');
+      await fetchDefaultRecommendations();
+    }
+  }
+
+  Future<void> fetchDefaultRecommendations() async {
+    try {
+      double userLatitude = -7.051834727886331;
+      double userLongitude = 110.4410954478625;
+      var campusService = ApiDataProvider();
+      var campuses = await campusService.getCampusesNearby(
+          latitude: userLatitude, longitude: userLongitude);
+
+      recommendedCampuses.value = campuses.take(4).toList();
+
+      // Cache the results
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setString('recommendedCampuses',
+          jsonEncode(recommendedCampuses.map((e) => e.toJson()).toList()));
+      await prefs.setInt(
+          'recommendedTimestamp', DateTime.now().millisecondsSinceEpoch);
+    } catch (e) {
+      print('Error fetching default recommendations: $e');
+      recommendedCampuses.value = [];
+    }
+  }
+
+  // Force refresh all data
+  Future<void> refreshAll() async {
+    await getAllCampusData();
+    await getLatestNews();
+    await initializeLocation();
+  }
+
   RxBool isNavigating = false.obs;
 
   Future<void> navigateToDetail(int beritaId) async {
@@ -65,24 +253,4 @@ class HomeController extends GetxController {
       }
     }
   }
-
-  Future<void> fetchRecommendedCampuses() async {
-    try {
-      final prefs = await SharedPreferences.getInstance();
-
-      double? userLatitude = prefs.getDouble('userLatitude');
-      double? userLongitude = prefs.getDouble('userLongitude');
-
-      debugPrint("$userLatitude");
-      debugPrint("$userLongitude");
-
-      var campusService = ApiDataProvider();
-      var campuses = await campusService.getCampusesNearby(
-          latitude: userLatitude!, longitude: userLongitude!);
-
-      recommendedCampuses.value = campuses.take(4).toList();
-    } catch (e) {
-      print('Error fetching recommended campuses: $e');
-    }
-  }
 }

lib/screens/auth/login.dart

@@ -271,7 +271,7 @@ class _LoginPageState extends State<LoginPage> {
           children: [
             GestureDetector(
               onTap: () {
-                Get.off(RegisterScreen());
+                Get.offNamed('/register');
               },
               child: Text(
                 "Daftar Sekarang",

lib/screens/auth/profile.dart

@@ -217,9 +217,7 @@ class ProfilePageState extends State<ProfilePage> {
 
         if (response['status_code'] == 200) {
           // Navigate to login screen and remove all previous routes
-          Navigator.of(context).pushReplacement(
-            MaterialPageRoute(builder: (_) => const LoginPage()),
-          );
+          Navigator.of(context).pushReplacementNamed('/login');
         } else {
           // Show error message
           ScaffoldMessenger.of(context).showSnackBar(

lib/screens/auth/register.dart

@@ -269,7 +269,7 @@ class _RegisterScreenState extends State<RegisterScreen> {
               SizedBox(
                 width: double.infinity,
                 child: ElevatedButton(
-                  onPressed: () => Get.offAll(() => const LoginPage()),
+                  onPressed: () => Get.offAllNamed('/login'),
                   style: ElevatedButton.styleFrom(
                     backgroundColor: Colors.blue[800],
                     padding: const EdgeInsets.symmetric(vertical: 16),
@@ -438,7 +438,7 @@ class _RegisterScreenState extends State<RegisterScreen> {
         ),
         GestureDetector(
           onTap: () {
-            Get.off(() => const LoginPage());
+            Get.offNamed('/login');
           },
           child: Text(
             "Login",

lib/screens/home.dart

@@ -22,15 +22,15 @@ class Home extends StatelessWidget {
             Align(
               alignment: Alignment.centerLeft,
               child: Text(
-                'Rekomendasi untuk Anda',
+                'Rekomendasi Kampus Terdekat',
                 style: GoogleFonts.poppins(
                   color: Colors.black,
                   fontSize: 18,
                   fontWeight: FontWeight.bold,
                 ),
               ),
             ),
-
+            const SizedBox(height: 16),
             GetX<HomeController>(
               init: HomeController(),
               builder: (controller) {

lib/screens/splashscreen/splashscreen.dart

@@ -51,11 +51,7 @@ class _SplashScreenState extends State<SplashScreen>
 
     // Timer to navigate to the next screen after 3 seconds
     Timer(const Duration(seconds: 4), () {
-      Navigator.of(context).pushReplacement(
-        MaterialPageRoute(
-            builder: (context) =>
-                const LoginPage()), // Replace with your next screen
-      );
+      Navigator.of(context).pushReplacementNamed('/login');
     });
   }