Added Http request for available Tournaments

frontend_splatournament_manager/lib/state_provider.dart

@@ -1,4 +1,8 @@
+import 'dart:convert';
+
 import 'package:flutter/material.dart';
+import 'package:frontend_splatournament_manager/models/tournament.dart';
+import 'package:http/http.dart' as http;
 
 class StateProvider extends ChangeNotifier {
   ThemeMode _themeMode = ThemeMode.system;
@@ -9,4 +13,22 @@ class StateProvider extends ChangeNotifier {
     _themeMode = mode;
     notifyListeners();
   }
+  List<Tournament>? _availableTournaments;
+  Future<List<Tournament>> fetchAvailableTournaments() async {
+    try {
+      var response = await http.get(Uri.parse('http://10.0.2.2:3000/availableTournaments'));
+      if (response.statusCode == 200) {
+        final List<dynamic> list = json.decode(response.body);
+
+        _availableTournaments = list.map((json) => Tournament.fromJson(json)).toList();
+        return _availableTournaments!;
+      }
+    } catch (e) {
+      print(e);
+      _availableTournaments = null;
+      return Future.error(e);
+    }
+    return[];
+  }
+  List<Tournament> get user => _availableTournaments ?? [];
 }