mchess-client/lib/pages/prepare_random_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/chess_bloc/chess_bloc.dart';
import 'package:mchess/chess_bloc/chess_events.dart';
import 'package:mchess/pages/chess_game.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

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

  @override
  State<PrepareRandomGameWidget> createState() =>
      _PrepareRandomGameWidgetState();
}

class _PrepareRandomGameWidgetState extends State<PrepareRandomGameWidget> {
  late Future randomGameResponse;

  @override
  void initState() {
    ChessBloc.getInstance().add(InitBoard());

    randomGameResponse = registerForRandomGame();

    goToGameWhenResponseIsHere(randomGameResponse as Future<PlayerInfo?>);

    super.initState();
  }

  void goToGameWhenResponseIsHere(Future<PlayerInfo?> resp) {
    resp.then((value) {
      if (value == null) return;
      context.push(
        '/game',
        extra: ChessGameArguments(
            lobbyID: value.lobbyID!,
            playerID: value.playerID!,
            passphrase: value.passphrase),
      );
    });
  }

  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(
        child: SizedBox(
          height: 100,
          width: 100,
          child: CircularProgressIndicator(),
        ),
      ),
    );
  }

  Future<PlayerInfo?> registerForRandomGame() async {
    String addr;
    Response response;

    if (kDebugMode) {
      addr = 'http://localhost:8080/api/random';
    } else {
      addr = 'https://chess.sw-gross.de:9999/api/random';
    }

    try {
      response = await http
          .get(Uri.parse(addr), headers: {"Accept": "application/json"});
    } catch (e) {
      if (!context.mounted) return null;

      const snackBar = SnackBar(
        backgroundColor: Colors.amberAccent,
        content: Text("mChess server is not responding. Try again or give up"),
      );
      Future.delayed(const Duration(seconds: 2), () {
        ScaffoldMessenger.of(context).clearSnackBars();
        ScaffoldMessenger.of(context).showSnackBar(snackBar);
        context.pop();
      });

      return null;
    }

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