Login.dart

import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:sac_soma/constant.dart';
import '../conversas.dart';
import 'package:sac_soma/app_data.dart';
// import 'package:js/js.dart';
// import 'package:js/js_util.dart';
// import 'package:sac_soma/utils/sha256.js';
// import 'package:sac_soma/utils/socket.io.js';
import 'package:adhara_socket_io/adhara_socket_io.dart';



class LoginScreen extends StatefulWidget {
  // final WebSocketChannel channel;
  LoginScreen({Key key}) : super(key: key);

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

class _LoginScreenState extends State<LoginScreen> {


  List<String> toPrint = ["trying to conenct"];
  SocketIOManager manager;
  SocketIO socket;
  bool isProbablyConnected = false;


  // ######################################

  _showDialog(String mensagem) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          backgroundColor: Colors.yellow[400],
          title: Text(
            'Erro no Login',
            style: TextStyle(color: Colors.red, fontWeight: FontWeight.w700),
          ),
          content: Text(
            mensagem,
            style: TextStyle(fontSize: 20.0, fontWeight: FontWeight.w800),
          ),
          actions: <Widget>[
            RaisedButton(
              color: Colors.lightGreenAccent[400],
              child: Text(
                'ok',
                style: TextStyle(color: Colors.white, fontSize: 18.0),
              ),
              onPressed: () {
                Navigator.of(context).pop();
              },
            )
          ],
        );
      },
    );
  }

  Future<String> loginServe() async {
    var url = "$baseURL/login";
    print(url);
    http.Response response = await http.post(
        //Uri.encodeFull removes all the dashes or extra characters present in our Uri
        Uri.encodeFull(url),
        headers: {
          'Conten-Type': 'application/json'
        },
        body: {
          'usuario': _userController.text,
          'senha': _passController.text,
          'tipo': 'mobile',
          'chave': chave
        });
    print("encoded json ${response.body}");

    Map<String, dynamic> data = json.decode(response.body);

    if (data['result'] == 'success') {
      appData.dadosJson = data['usuario'];

      // var usuarioid = data['usuario']['id'];
      // var urlConversas = "$baseURL/conversas/$usuarioid";

      // http.Response resposta = await http.get(
      // Uri.encodeFull(urlConversas), headers: {
      //   'Conten-Type': 'application/json',
      //   'Authorization': chave,
      // });
      // print(resposta.body);
      // Map<String, dynamic> dados = json.decode(resposta.body);





      // socket







      // Navigator.pushReplacement(
      //   context,
      //   MaterialPageRoute<Map>(
      //     builder: (context) => ConversasScreen(
      //       // add conversas posteriormente :: linha abaixo
      //       // conversas: data['usuario'],
      //       dadosUsuario: data['usuario'],
      //     ),
      //   ),
      // );
    } else {
      _showDialog(data['msg']);
    }
  }

//  controllers
  TextEditingController _userController = TextEditingController();
  TextEditingController _passController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    var btnLogin = Container(
      margin: EdgeInsets.only(top: 20.0),
      width: MediaQuery.of(context).size.width,
      height: 35.0,
      child: FlatButton.icon(
        onPressed: loginServe,
        //getData, // declarar sem parentesis
        icon: Icon(
          Icons.forward,
          color: Colors.white,
        ),
        color: Color(0xFF81dc54),
        label: Text(
          "Entrar",
          style: TextStyle(
            color: Colors.white,
          ),
        ),
      ),
    );

    var formLogin = Column(children: <Widget>[
      TextField(
        controller: _userController,
        decoration: InputDecoration(
          suffixIcon: Icon(Icons.account_circle),
          labelText: 'Usuário',
        ),
      ),
      Container(
        margin: EdgeInsets.only(top: 20.0, bottom: 20.0),
        child: TextField(
          obscureText: true,
          controller: _passController,
          decoration: InputDecoration(
            suffixIcon: Icon(Icons.security),
            labelText: 'Senha',
          ),
        ),
      ),
    ]);

    var logoSomaSac = Container(
      margin: EdgeInsets.only(bottom: 30.0, top: 30.0),
      child: Image.asset(
        'images/SomaSac.png',
        alignment: Alignment.center,
        height: 80.0,
      ),
    );

    return Scaffold(
        backgroundColor: Colors.grey[100],
        body: Container(
          alignment: Alignment.center,
          child: ListView(children: <Widget>[
            Container(
                alignment: Alignment.center,
                margin: EdgeInsets.all(40.0),
                padding: EdgeInsets.all(16.0),
                child: Column(
                  children: <Widget>[
                    logoSomaSac,
                    Column(
                      children: [
                        formLogin,
                        btnLogin,
                      ],
                    ),
                  ],
                ))
          ]),
        ));
  }
}