// const route
class Constant {
  static const String baseUrl = "http://192.168.6.106/latihan/api/";
  static const String apiAddProduct = baseUrl + "addproduct.php";
  static const String apiGetProduct = baseUrl + "getproduct.php";
  static const String apiLogin = baseUrl + "login.php";
}

// entry dart
import 'package:flutter/material.dart';
import 'package:flutter_cupertino_date_picker/flutter_cupertino_date_picker.dart';
import 'package:barcode_scan/barcode_scan.dart';
import 'package:flutter/services.dart';
import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'const.dart';

class Response {
  final String status;
  final String message;

  Response({this.status, this.message});

  factory Response.fromJson(Map<String, dynamic> json) {
    return Response(
      status: json['status'],
      message: json['message'],
    );
  }
}

Future<Response> post(String url,var body)async{
  return await http
      .post(Uri.encodeFull(url), body: body, headers: {"Accept":"application/json"})
      .then((http.Response response) {

    final int statusCode = response.statusCode;

    if (statusCode < 200 || statusCode > 400 || json == null) {
      throw new Exception("Error while fetching data");
    }
    return Response.fromJson(json.decode(response.body));
  });
}

class EntryData extends StatefulWidget {
  @override
  EntryDataState createState() => new EntryDataState();
}

class EntryDataState extends State<EntryData> {

  // text field
  final _nomerRakController = TextEditingController();
  final _namaProdukController = TextEditingController();
  // dropdown category
  List _category = ["Buah-buahan", "Snack", "Stationary", "Baju", "Ice Cream"];
  List<DropdownMenuItem<String>> _dropDownMenuItems;
  String _currentCategory;
  // datepicker
  String _datetime = '';
  int _year = 2018;
  int _month = 11;
  int _date = 11;
  // radio
  String _radioValue1;
  // scanner
  String _scanResult = '';
  // member simpan data
  String _response = '';
  bool apiCall = false;

  @override
  void initState() {
    super.initState();
    // dropdown category
    _dropDownMenuItems = getDropDownMenuItems();
    _currentCategory = _dropDownMenuItems[0].value;
    // datepicker
    DateTime now = DateTime.now();
    _year = now.year;
    _month = now.month;
    _date = now.day;
  }

  // widget simpan data
  Widget getProperWidget(){
    if(apiCall)
      return AlertDialog(
          content: new Column(
            children: <Widget>[
              CircularProgressIndicator(),
              Text("Please wait")
            ],
          )
      );
    else
      return Center(
          child: Text(
              _response,
              style: new TextStyle(fontSize: 15.0)
          )
      );
  }

  void _callPostAPI() {
    post(
        Constant.apiAddProduct,
        {
          "nomor_rak": _nomerRakController.text,
          "nama_produk": _namaProdukController.text,
          "kategori": _currentCategory,
          "expired_date": _datetime,
          "scan_code": _scanResult,
          "discount": _radioValue1
        }).then((response) {

      setState(() {
        apiCall = false;
        _response = response.message;
      });

      // tambahkan baris ini
      Navigator.pop(context);

    },
        onError: (error) {
          apiCall = false;
          _response = error.toString();
        }
    );
  }

  // dropdown category
  List<DropdownMenuItem<String>> getDropDownMenuItems() {
    List<DropdownMenuItem<String>> items = new List();
    for (String kategori in _category) {
      items.add(new DropdownMenuItem(
          value: kategori,
          child: new Text(kategori)
      ));
    }
    return items;
  }

  void changedDropDownItem(String selectedCategory) {
    setState(() {
      _currentCategory = selectedCategory;
    });
  }

  // radio discount
  void _handleRadioValueChange1(String value) {
    setState(() {
      _radioValue1 = value;
    });
  }

  /// Display date picker.
  void _showDatePicker() {
    final bool showTitleActions = false;
    DatePicker.showDatePicker(
      context,
      showTitleActions: true,
      minYear: 2019,
      maxYear: 2022,
      initialYear: _year,
      initialMonth: _month,
      initialDate: _date,
      confirm: Text(
        'PILIH',
        style: TextStyle(color: Colors.red),
      ),
      cancel: Text(
        'BATAL',
        style: TextStyle(color: Colors.cyan),
      ),
      locale: "en",
      dateFormat: "dd-mm-yyyy",
      onChanged: (year, month, date) {
        //debugPrint('onChanged date: $year-$month-$date');

        if (!showTitleActions) {
          _changeDatetime(year, month, date);
        }
      },
      onConfirm: (year, month, date) {
        _changeDatetime(year, month, date);
      },
    );
  }

  void _changeDatetime(int year, int month, int date) {
    setState(() {
      _year = year;
      _month = month;
      _date = date;
      _datetime = '$date-$month-$year';
    });
  }

  // scan QR
  Future _scanQR() async {
    try {
      String qrResult = await BarcodeScanner.scan();
      setState(() {
        _scanResult = qrResult;
      });
    } on PlatformException catch (ex) {
      if (ex.code == BarcodeScanner.CameraAccessDenied) {
        setState(() {
          _scanResult = "Camera permission was denied";
        });
      } else {
        setState(() {
          _scanResult = "Unknown Error $ex";
        });
      }
    } on FormatException {
      setState(() {
        _scanResult = "You pressed the back button before scanning anything";
      });
    } catch (ex) {
      setState(() {
        _scanResult = "Unknown Error $ex";
      });
    }
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Produk Entry'),
      ),
      body: SafeArea(
          child: ListView(
            padding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
            children: <Widget>[
              // text field
              TextField(
                controller: _nomerRakController,
                decoration: InputDecoration(
                  filled: false,
                  labelText: 'Nomer Rak',
                ),
              ),
              // spacer
              SizedBox(height: 5.0),
              // text field
              TextField(
                controller: _namaProdukController,
                decoration: InputDecoration(
                  filled: false,
                  labelText: 'Nama Produk',
                ),
              ),

              // Dropdown
              new Container(
                padding: EdgeInsets.all(10.0),
                //color: Colors.blueGrey,
                child: new Row(
                  children: <Widget>[
                    new Text("Kategori: ", style: new TextStyle(fontSize: 15.0)),
                    new DropdownButton(
                      value: _currentCategory,
                      items: _dropDownMenuItems,
                      onChanged: changedDropDownItem,
                    )
                  ],
                ),
              ),

              // datepicker
              new Container(
                //padding: EdgeInsets.all(10.0),
                //color: Colors.blueGrey,
                child: new Row(
                  children: <Widget>[
                    RaisedButton(
                      child: Text('Expired Date', style: new TextStyle(fontSize: 15.0)),
                      onPressed: () {
                        _showDatePicker();
                      },
                    ),
                    new Text("  $_datetime", style: new TextStyle(fontSize: 15.0)),
                  ],
                ),
              ),

              // QR scanner
              new Container(
                //padding: EdgeInsets.all(10.0),
                //color: Colors.blueGrey,
                child: new Row(
                  children: <Widget>[
                    RaisedButton(
                      child: Text(' Scan Code  ', style: new TextStyle(fontSize: 15.0)),
                      onPressed: () {
                        _scanQR();
                      },
                    ),
                    new Text("  $_scanResult", style: new TextStyle(fontSize: 15.0)),
                  ],
                ),
              ),

              // Radio
              new Container(
                //padding: EdgeInsets.all(10.0),
                //color: Colors.blueGrey,
                child: new Row(
                  children: <Widget>[
                    new Radio(
                      value: "Discount",
                      groupValue: _radioValue1,
                      onChanged: _handleRadioValueChange1,
                    ),
                    new Text(
                      'Discount',
                      style: new TextStyle(fontSize: 15.0),
                    ),
                    new Radio(
                      value: "Non Discount",
                      groupValue: _radioValue1,
                      onChanged: _handleRadioValueChange1,
                    ),
                    new Text(
                      'Non Discount',
                      style: new TextStyle(fontSize: 15.0),
                    ),
                  ],
                ),
              ),

              // button
              RaisedButton(
                child: Text('SIMPAN'),
                onPressed: () {

                  setState((){
                    apiCall=true; // Set state like this
                  });

                  _callPostAPI();
                },

              ),

              // POST Response
              getProperWidget(),

            ],
          )
      ),
    );
  }
}

// list.dart
import 'package:flutter/material.dart';
import 'package:flutter_app/login.dart';
import 'dart:convert';
import 'dart:async';
import 'package:http/http.dart' as http;
import 'package:flutter/foundation.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'const.dart';

// class untuk objek json
class Product {
  final String id;
  final String nama_produk;
  final String kategori;
  final String expired_date;
  final String nomor_rak;
  final String scan_code;
  final String discount;

  Product({this.id, this.nama_produk, this.kategori, this.expired_date,
    this.nomor_rak, this.scan_code, this.discount});

  factory Product.fromJson(Map<String, dynamic> json) {
    return Product(
      id: json['id'] as String,
      nama_produk: json['nama_produk'] as String,
      kategori: json['kategori'] as String,
      expired_date: json['expired_date'] as String,
      nomor_rak: json['nomor_rak'] as String,
      scan_code: json['scan_code'] as String,
      discount: json['discount'] as String,
    );
  }
}

// fungsi parse foto untuk mengubah dari string json ke array List<Photo>
List<Product> parseProduct(String responseBody) {
  final parsed = json.decode(responseBody).cast<Map<String,dynamic>>();
  return parsed.map<Product>((json)=>Product.fromJson(json)).toList();
}

// fungsi fetch untuk mengubah dari end point api ke array List<Photo>
Future<List<Product>> fetchProduct(http.Client client) async {
  final response = await client.get(Constant.apiGetProduct);
  return compute(parseProduct, response.body);
}

class ProductList extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return FutureBuilder <List<Product>> (
        future: fetchProduct(http.Client()),
        builder: (context, snapshot) {
          if (snapshot.hasError) print(snapshot.error);
          return (snapshot.hasData) ? ProductListBuilder(photos: snapshot.data):
          Center(child: CircularProgressIndicator());
        }
    );
  }
}

class ProductListBuilder extends StatelessWidget {
  final List<Product> photos;
  ProductListBuilder({Key key, this.photos}) : super(key : key);

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: photos.length,
      itemBuilder: (context, index) {
        return ListTile (
          // title: Text('Title '+photos[index].title),
          title : Column (
            children: <Widget>[
              ListTile(
                title: Text("Nama Produk : ${photos[index].nama_produk}"),
                subtitle: Text(
                    "Kategori : ${photos[index].kategori} \n"+
                        "Expired date : ${photos[index].expired_date} \n" +
                        "Nomor Rak : ${photos[index].nomor_rak} \n" +
                        "Scan code : ${photos[index].scan_code} \n" +
                        "Diskon : ${photos[index].discount} \n"
                ),
              ),
              Divider(),
            ],
          ),
        );
      },
    );
  }
}

Widget listProduct (BuildContext context) {
  return new Scaffold(
    appBar: new AppBar(
      title: const Text("W2 Flutter"),
    ),
    body: new ProductList(),
    floatingActionButton: FloatingActionButton(
        child: Icon(Icons.add),
        onPressed: () {
          Navigator.pushNamed(context, '/entry');
        }
    ),
    drawer: Drawer(
      child: ListView(
        children: <Widget>[
          UserAccountsDrawerHeader(
            accountName: Text("Wisnu Wijokangko"),
            accountEmail: Text("wisnuwijo3@gmail.com"),
            decoration: BoxDecoration(
              color: Colors.blueAccent,
            ),
            currentAccountPicture:
              CircleAvatar(
                backgroundImage: NetworkImage("https://i0.wp.com/www.winhelponline.com/blog/wp-content/uploads/2017/12/user.png?fit=256%2C256&quality=100&ssl=1"),
              ),
          ),
          ListTile(
            title: Text('Profile'),
            trailing: Icon(Icons.person),
            leading: Icon(Icons.arrow_right),
            onTap: () {

            },
          ),
          ListTile(
            title: Text('Favorites'),
            trailing: Icon(Icons.favorite),
            leading: Icon(Icons.arrow_right),
            onTap: () {

            },
          ),
          ListTile(
            title: Text('Settings'),
            trailing: Icon(Icons.settings),
            leading: Icon(Icons.arrow_right),
            onTap: () {

            },
          ),
          ListTile(
            title: Text('Logout'),
            trailing: Icon(Icons.exit_to_app),
            leading: Icon(Icons.arrow_right),
            onTap: () async {
              // redirect ke login
              Navigator.pop(context);
              Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => Login())
              );

              Navigator.of(context).pushNamedAndRemoveUntil('/login',
                      (Route<dynamic> route) => false);

              final prefs = await SharedPreferences.getInstance();
              prefs.remove('login');
            },
          ),
        ],
      ),
    ),
  );
}

// login
import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:flutter_app/list.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'const.dart';

// class response json
class Response {
  final String status;
  final String message;

  Response({this.status, this.message});

  factory Response.fromJson(Map<String, dynamic> json) {
    return Response(
      status: json['status'],
      message: json['message'],
    );
  }
}


class Login extends StatefulWidget {
  @override
  LoginState createState() => new LoginState();
}

class LoginState extends State<Login> {

  // variabel member class
  final _username = TextEditingController();
  final _password = TextEditingController();

  // member response
  String _response = '';
  bool _apiCall = false;

  // login shared prefs
  bool alreadyLogin = false;

  // fungsi untuk kirim http post
  Future<Response> post(String url,var body)async{
    return await http
        .post(Uri.encodeFull(url), body: body, headers: {"Accept":"application/json"})
        .then((http.Response response) {

      final int statusCode = response.statusCode;

      if (statusCode < 200 || statusCode > 400 || json == null) {
        throw new Exception("Error while fetching data");
      }
      return Response.fromJson(json.decode(response.body));
    });
  }

  // fungsi panggil API
  void _callPostAPI() {
    post(
        Constant.apiLogin,
        {
          'username': _username.text,
          'password': _password.text
        }).then((response) async {
      // jika respon normal
      setState(() {
        _apiCall = false;
        _response = response.message;
      });

      if (response.status == "success") {
        // simpan shared prefs sudah login
        final prefs = await SharedPreferences.getInstance();
        setState(() {
          alreadyLogin = true;
          prefs.setBool('login', alreadyLogin);
        });

        // menuju route list product
//        Navigator.push(
//            context,
//            MaterialPageRoute(builder: (context) => listProduct(context))
//        );
        Navigator.pushNamed(context,'/list');
      }

    },
        // jika respon error
        onError: (error) {
          _apiCall = false;
          _response = error.toString();
        }
    );
  }

  Widget progressWidget() {
    if (_apiCall)
      // jika masih proses kirim API
      return AlertDialog(
        content: new Column(
          children: <Widget>[
            CircularProgressIndicator(),
            Text("Please wait")
          ],
        ),
      );
    else
      // jika sudah selesai kirim API
      return Center(
        child: Text(
          _response,
          style: new TextStyle(fontSize: 15.0),
        ),
      );
  }

  Future<bool> getLoginStatus() async{
    final prefs = await SharedPreferences.getInstance();
    bool loginStatus = prefs.getBool('login') ?? false;
    print('login status $loginStatus');
    return loginStatus;
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<bool>(
      future: getLoginStatus(),
      builder: (context, snapshot) {
        return (snapshot.data) ?
        // jika alreadyLogin = true
        listProduct(context) :
        // jika alreadyLogin = false
        loginForm();
      },
    );
  }

  Widget loginForm() {
    return Scaffold(
        appBar: new AppBar(
          title: const Text('W2 Flutter'),
          automaticallyImplyLeading: false,
        ),
        body: SafeArea(
            child: ListView(
              padding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
              children: <Widget>[
                // nama
                TextField(
                  controller: _username,
                  decoration: InputDecoration(
                      filled: true,
                      labelText: 'Username'
                  ),
                ),
                // spasi
                SizedBox(height: 5.0),
                // alamat
                TextField(
                  controller: _password,
                  decoration: InputDecoration(
                      filled: true,
                      labelText: 'Password'
                  ),
                  obscureText: true,
                ),
                // spasi
                SizedBox(height: 10.0),
                // tombol
                RaisedButton(
                  child: Text('LOGIN'),
                  onPressed: () {

                    setState(() {
                      _apiCall = true;
                    });
                    _callPostAPI();
/*
                  return showDialog(
                    context: context,
                    builder: (context) {
                      return AlertDialog(
                        content: Text('Username: ${_username.text}\nPassword: ${_password.text}'),
                      );
                    },
                  );
*/
                  },
                ),

                // panggil loading widget
                progressWidget()
              ],
            )
        )
    );

  }
}

// main.dart
import 'package:flutter/material.dart';
import 'package:flutter_app/entry.dart';
import 'package:flutter_app/list.dart';
import 'sample_list.dart';
//import 'tabs.dart';
import 'login.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: new Login(),
      initialRoute: '/login',
      routes: {
        '/login' : (context) => Login(),
        '/list' : (context) => listProduct(context),
        '/entry' : (context) => EntryData(),
      },
    );
  }
}