handle fetching peers && add users' peers to shared preferences

Author: AlaaElattar

lib/features/home/home_screen.dart

@@ -229,8 +229,8 @@ class _StatsRow extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final peers = ref.watch(peersProvider);
-    final peersCount = peers.length;
+    final peersAsync = ref.watch(peersProvider);
+    final peersCount = peersAsync.maybeWhen(data: (list) => list.length, orElse: () => 0);
     Widget tileContent(IconData icon, String title, String value) => Column(
           mainAxisSize: MainAxisSize.min,
           crossAxisAlignment: CrossAxisAlignment.center,
@@ -279,4 +279,4 @@ class _StatsRow extends ConsumerWidget {
 // TODO: VPN implemented or not and if yes, how to get its data ?
 //TODO: How to get num of peers, bandwidth, uptime ??
 //TODO: How to get All data in peers screen ?
-// TODO: what is the input to add a peer ?
+ 

lib/features/peers/peers_repository.dart

@@ -0,0 +1,29 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+class PeersRepository {
+  static const _peersKey = 'user_peers';
+
+  Future<List<String>> loadPeers() async {
+    final prefs = await SharedPreferences.getInstance();
+    return prefs.getStringList(_peersKey) ?? [];
+  }
+
+  Future<void> savePeers(List<String> peers) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setStringList(_peersKey, peers);
+  }
+
+  Future<void> addPeer(String peer) async {
+    final peers = await loadPeers();
+    if (!peers.contains(peer)) {
+      peers.add(peer);
+      await savePeers(peers);
+    }
+  }
+
+  Future<void> removePeer(String peer) async {
+    final peers = await loadPeers();
+    peers.remove(peer);
+    await savePeers(peers);
+  }
+}