import 'dart:async';
import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

Future<Btcusdt> fetchBtcusdt() async {
  final response =
      await http.get(Uri.https('api.binance.com', 'api/v3/ticker/24hr'));
  if (response.statusCode == 200) {
    return Btcusdt.fromJson(jsonDecode(response.body));
  } else {
    throw Exception('Failed to load Btcusdt');
  }
}

class Btcusdt {
  final double? valuebtc;
  Btcusdt({required this.valuebtc});

  factory Btcusdt.fromJson(List<dynamic> json) {
    return Btcusdt(
        valuebtc: double.parse(json
            .where((element) => element['symbol'].contains("BTCUSDT"))
            .toList()
            .first['lastPrice']));
  }
}

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  MyApp({Key? key}) : super(key: key);

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  late Future<Btcusdt> futureBtcusdt;

  @override
  void initState() {
    super.initState();
    futureBtcusdt = fetchBtcusdt();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Fetch Data Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Fetch Data Example'),
        ),
        body: Center(
          child: FutureBuilder<Btcusdt>(
            future: futureBtcusdt,
            builder: (context, snapshot) {
              if (snapshot.hasData) {
                return Text(snapshot.data!.valuebtc.toString(),
                    style: TextStyle(fontSize: 15));
              } else if (snapshot.hasError) {
                return Text(
                  "${snapshot.error}",
                  style: TextStyle(fontSize: 15),
                );
              }
              return CircularProgressIndicator();
            },
          ),
        ),
      ),
    );
  }
}