eksplicit mapping af envs

app/lib/services/api_service.dart

@@ -0,0 +1,43 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import 'package:sighej/models/match_result.dart';
+
+const _baseUrl = String.fromEnvironment('API_URL', defaultValue: 'http://10.0.2.2:8000');
+
+/// Registers the user's profile with the backend session store.
+Future<void> registerSession(
+  String bleToken,
+  List<String> interests, {
+  String name = '',
+  String tagline = '',
+}) async {
+  final response = await http.post(
+    Uri.parse('$_baseUrl/session'),
+    headers: {'Content-Type': 'application/json'},
+    body: jsonEncode({
+      'ble_token': bleToken,
+      'interests': interests,
+      if (name.isNotEmpty) 'name': name,
+      if (tagline.isNotEmpty) 'tagline': tagline,
+    }),
+  );
+  if (response.statusCode != 200) {
+    throw Exception('Failed to register session: ${response.statusCode}');
+  }
+}
+
+/// Reports a detected BLE token to the backend and returns the match result.
+/// Returns null if the backend returns a non-200 status (soft failure).
+Future<MatchResult?> reportMatch(String ownToken, String detectedToken) async {
+  try {
+    final response = await http.post(
+      Uri.parse('$_baseUrl/match'),
+      headers: {'Content-Type': 'application/json'},
+      body: jsonEncode({'own_token': ownToken, 'detected_token': detectedToken}),
+    );
+    if (response.statusCode != 200) return null;
+    return MatchResult.fromJson(jsonDecode(response.body) as Map<String, dynamic>);
+  } catch (_) {
+    return null;
+  }
+}