flutter_authentication3

import 'package:flutter/material.dart';

class Authentication extends StatefulWidget {
  @override
  _AuthenticationState createState() => _AuthenticationState();
}

//Complete 13: buat 2 nilai enum untuk FormType
enum FormType { signIn, signUp }

class _AuthenticationState extends State<Authentication> {
  //Complete 3: buat global key
  final formKey = GlobalKey<FormState>();

  String _email;
  String _password;

  //Complete 14: inisialisasi nilai formType
  FormType _formType = FormType.signIn;

  //TODO 24: ubah return value jadi bool
  bool validateAndSave() {
    //Complete 5: buat variabel form dan diberi state dari formKey
    final form = formKey.currentState;
    //Complete 9: simpan form
    form.save();
    //Complete 6: lakukan validasi
    if (form.validate()) {
      //Complete 10: print nilai _email dan _password
      print('Form is valid. Email: $_email, Password: $_password');
      return true;
    } else {
      print('Form is invalid. Email: $_email, Password: $_password');
      return false;
    }
  }

  //TODO 25: buat function validateAndSubmit
  void validateAndSubmit() {
    //TODO 26: cek apakah form valid
    if(validateAndSave()) {
      //TODO 27: gunakan try-catch untuk memeriksa error
      try{
        //TODO 28: kondisi signIn atau signUp
        if(_formType == FormType.signIn) {
          //TODO 29: buat proses signIn
        } else {
          //TODO 30: buat proses signUp
        }
      } catch (e) {
        print("Error: $e");
      }
    }
  }

  //Complete 12: buat function untuk berpindah dari Sign In ke Sign Up
  void moveToSignUp() {
    //Complete 15: set formType menjadi signUp dan reload
    setState(() {
      _formType = FormType.signUp;
    });
  }

  void moveToSignIn() {
    //Complete 16: set formType menjadi signIn dan reload
    setState(() {
      _formType = FormType.signIn;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Autentication'),
      ),
      body: Container(
        padding: EdgeInsets.all(16.0),
        child: Form(
          //Complete 4: pasang key
          key: formKey,

          child: Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            children:
                //Complete 21: panggil buildInputs dan buildButtons
                buildInputs() + buildButtons(),
          ),
        ),
      ),
    );
  }

  //Complete 17: refactor kedua TextFormField
  List<Widget> buildInputs() {
    //Complete 18: pindahkan kedua TextFormField
    return [
      TextFormField(
        keyboardType: TextInputType.emailAddress,
        decoration: InputDecoration(labelText: 'Email'),
        //Complete 1: validasi email
        validator: (value) => value.isEmpty ? 'Email can\'t be empty' : null,
        //Complete 7: simpan nilai email
        onSaved: (value) => _email = value,
      ),
      TextFormField(
        decoration: InputDecoration(labelText: 'Password'),
        //Complete 2: validasi password
        validator: (value) => value.length < 6 ? 'Minimum 6 characters' : null,
        obscureText: true,
        //Complete 8: simpan nilai password
        onSaved: (value) => _password = value,
      ),
    ];
  }

  //Complete 19: refactor kedua Button
  List<Widget> buildButtons() {
    //TODO 21: buat kondisi untuk signUp dan signIn
    if (_formType == FormType.signIn) {
      //Complete 20: pindahkan kedua Button
      return [
        RaisedButton(
          //Complete 10: ganti teks dengan Sign In
          child: Text('Sign In'),
          //TODO 22: ubah function menjadi validateAndSubmit
          onPressed: validateAndSubmit,
          color: Colors.deepOrange,
          textColor: Colors.white,
        ),
        //Complete 11: buat FlatButton untuk sign up
        FlatButton(
          child: Text(
            'Create a new account',
            style: TextStyle(fontSize: 16.0),
          ),
          onPressed: moveToSignUp,
        ),
      ];
    } else {
      return [
        RaisedButton(
          //Complete 10: ganti teks dengan Sign In
          child: Text('Sign Up'),
          //TODO 23: ubah function menjadi validateAndSubmit
          onPressed: validateAndSubmit,
          color: Colors.deepOrange,
          textColor: Colors.white,
        ),
        //Complete 11: buat FlatButton untuk sign up
        FlatButton(
          child: Text(
            'Already have an account? Sign In',
            style: TextStyle(fontSize: 16.0),
          ),
          onPressed: moveToSignIn,
        ),
      ];
    }
  }
}