import 'dart:async';

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'login/login_model.dart';

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

  @override
  State<StartPage> createState() => _StartPageState();
}

class _StartPageState extends State<StartPage> {
  late StreamSubscription subscription;
  LoginModel _viewmodel = new LoginModel();

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    subscription = _viewmodel.streamController.stream.listen((newData) {
      String code = newData['code'];
      if (code.isNotEmpty) {
        switch (code) {
          case "login":
            Navigator.pushReplacementNamed(context, "/HomePage");
            break;

          default:
            Navigator.pushReplacementNamed(context, "/HomePage");
            break;
        }
      }
    });

    _loadData();
  }

  @override
  void dispose() {
    // TODO: implement dispose
    subscription.cancel();
    super.dispose();
  }

  Future<void> _loadData() async {
    // 获取token
    final SharedPreferences prefs = await SharedPreferences.getInstance();

    final String? token = prefs.getString('token');

    if (token != "") {
      _viewmodel.login("", "", 0, token);
    } else {
      Navigator.pushReplacementNamed(context, "/HomePage");
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Image(
        width: MediaQuery.of(context).size.width,
        height: MediaQuery.of(context).size.height,
        fit: BoxFit.cover,
        image: AssetImage('assets/images/img_start.png'),
      ),
    );
  }
}