import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:backendless_sdk/backendless_sdk.dart';


void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MaterialApp(
    home: App(),
  ));
}

class App extends StatelessWidget {
  final Future<FirebaseApp> _initialization = Firebase.initializeApp();

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      // Initialize FlutterFire:
      future: _initialization,
      builder: (context, snapshot) {
        if (snapshot.hasError) {
          return Text(snapshot.error.toString());
        }
        if (snapshot.connectionState == ConnectionState.done) {
          return _HomeState();
        }
        return CircularProgressIndicator();
      },
    );
  }
}

class _HomeState extends StatefulWidget {
  @override
  __HomeStateState createState() => __HomeStateState();
}

class __HomeStateState extends State<_HomeState> {
  @override
  void initState() {
    super.initState();

    // uncomment the line below if your application is hosted in the European hosting zone of Backendless:
    Backendless.setUrl("https://eu-api.backendless.com");

    Backendless.initApp(
        "EF7D3338-C2D8-3CB9-FF63-6455EEC5B800",
        "203C0D06-200E-4C82-9E27-EC6327EF52D3",
        "8B454563-3AE9-41A9-A4E0-658001D6B2AB");
    Backendless.initWebApp("EF7D3338-C2D8-3CB9-FF63-6455EEC5B800",
        "E1D75CDD-A81C-4BCA-9962-F98B9F2ED1BC");
  }

  final firestoreInstance = FirebaseFirestore.instance;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
          child: Column(
        children: [
          StreamBuilder<QuerySnapshot>(
            stream: firestoreInstance
                .collection("users")
                .orderBy("createdTime")
                .snapshots(),
            builder: (context, snapshot) {
              if (!snapshot.hasData) return LinearProgressIndicator();
              return Expanded(child: _buildList(snapshot.data));
            },
          ),
        ],
      )),
    );
  }

  void onPressedNegativ(String docID) async {
    Set<String> adresses = ["mark@backendless.com"].toSet();
    EmailEnvelope envelope = EmailEnvelope()..to = adresses;

    Backendless.messaging
        .sendEmailFromTemplate("DRK Negativ", envelope)
        .then((response) {
      print("Email sended");
    });

    String userEmail;
    String userName;

    firestoreInstance
        .collection("users")
        .doc(docID)
        .update({"ergebnis": "Erhalten"});
    DocumentSnapshot variable =
        await firestoreInstance.collection("users").doc(docID).get();
    userEmail = variable['email'];
    userName = variable['nachname'];
    print(userEmail + userName);
  }

  Widget _buildList(QuerySnapshot snapshot) {
    return ListView.separated(
      padding: EdgeInsets.all(20),
      separatorBuilder: (context, index) => Container(
        height: 10,
      ),
      itemCount: snapshot.docs.length,
      itemBuilder: (context, index) {
        final doc = snapshot.docs[index];
        return ListTile(
          key: Key(doc.id),
          leading: (doc["ergebnis"] == "Ausstehend")
              ? Icon(Icons.schedule)
              : Icon(Icons.check),
          title: Text(
            doc["nachname"] + ", " + doc["vorname"],
          ),
          subtitle: Text(doc["adresse"] +
              " / " +
              doc["Geburtsdatum"] +
              " / " +
              doc["telefon"]),
          trailing: Wrap(
            spacing: 12,
            children: [
              OutlineButton.icon(
                borderSide: BorderSide(color: Colors.red),
                onPressed: () {},
                icon: Icon(
                  Icons.cancel_rounded,
                  color: Colors.red,
                ),
                label: Text(
                  "Test positiv",
                  style: TextStyle(color: Colors.red),
                ),
                shape: RoundedRectangleBorder(
                    borderRadius: new BorderRadius.circular(30.0)),
              ),
              OutlineButton.icon(
                borderSide: BorderSide(color: Colors.green),
                onPressed: () => onPressedNegativ(doc.id),
                icon: Icon(
                  Icons.check_box_rounded,
                  color: Colors.green,
                ),
                label: Text(
                  "Test negativ",
                  style: TextStyle(color: Colors.green),
                ),
                shape: RoundedRectangleBorder(
                    borderRadius: new BorderRadius.circular(30.0)),
              )
            ],
          ),
        );
      },
    );
  }
}