initial commit

lib/core/connections/connection_storage.dart

@@ -0,0 +1,41 @@
+import 'dart:convert';
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'connection.dart';
+
+const _connectionsKey = 'connections';
+const _activeConnectionIdKey = 'active_connection_id';
+
+/// Reads/writes the saved connection list and active-connection id to
+/// [SharedPreferences] as a plain JSON-encoded array. Not a secret store —
+/// the API has no auth, so there's nothing sensitive in a saved base URL.
+class ConnectionStorage {
+  const ConnectionStorage(this._prefs);
+
+  final SharedPreferences _prefs;
+
+  List<Connection> readConnections() {
+    final raw = _prefs.getString(_connectionsKey);
+    if (raw == null || raw.isEmpty) return const [];
+    final decoded = jsonDecode(raw) as List<dynamic>;
+    return decoded
+        .map((e) => Connection.fromJson(e as Map<String, dynamic>))
+        .toList(growable: false);
+  }
+
+  Future<void> writeConnections(List<Connection> connections) async {
+    final encoded = jsonEncode(connections.map((c) => c.toJson()).toList());
+    await _prefs.setString(_connectionsKey, encoded);
+  }
+
+  String? readActiveConnectionId() => _prefs.getString(_activeConnectionIdKey);
+
+  Future<void> writeActiveConnectionId(String? id) async {
+    if (id == null) {
+      await _prefs.remove(_activeConnectionIdKey);
+    } else {
+      await _prefs.setString(_activeConnectionIdKey, id);
+    }
+  }
+}