mchess-client/lib/pages/prepare_chess_game.dart

import 'dart:developer';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:http/http.dart';
import 'package:mchess/api/register.dart';
import 'package:mchess/pages/chess_game.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

class PrepareChessGameWidget extends StatefulWidget {
  const PrepareChessGameWidget({super.key});

  @override
  State<PrepareChessGameWidget> createState() => _PrepareChessGameWidgetState();
}

class _PrepareChessGameWidgetState extends State<PrepareChessGameWidget> {
  late Future randomGameResponse;

  @override
  void initState() {
    randomGameResponse = registerForRandomGame();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder(
        future: randomGameResponse,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            log('Response from registering to random game ${snapshot.data}');

            if (snapshot.data != null) {
              return ChessGame(
                playerID: snapshot.data!.playerID,
                lobbyID: snapshot.data!.lobbyID,
              );
            }
          }
          return const Center(
            child: SizedBox(
              height: 100,
              width: 100,
              child: CircularProgressIndicator(),
            ),
          );
        },
      ),
    );
  }

  Future<ResponseFromRegisteringGame?> registerForRandomGame() async {
    String addr;
    if (kDebugMode) {
      addr = 'http://localhost:8080/api/random';
    } else {
      addr = 'https://chess.sw-gross.de:9999/api/random';
    }

    Response response;

    try {
      response = await http
          .get(Uri.parse(addr), headers: {"Accept": "application/json"});
    } catch (e) {
      const snackBar = SnackBar(
          backgroundColor: Colors.amberAccent,
          content:
              Text("mChess server is not responding. Try again or give up"));

      if (!context.mounted) return null;

      ScaffoldMessenger.of(context).clearSnackBars();
      ScaffoldMessenger.of(context).showSnackBar(snackBar);

      Future.delayed(const Duration(seconds: 2), () {
        context.goNamed('lobbySelector');
      });

      return null;
    }

    if (response.statusCode == 200) {
      log(response.body);
      return ResponseFromRegisteringGame.fromJson(jsonDecode(response.body));
    }
    return null;
  }
}