import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:doctorradar/pages/doctorssubmit.dart';
import 'dart:async';
import 'package:doctorradar/pages/doctorsarea.dart';


String docid;
bool exist=false;
final Controller = TextEditingController();
bool enter=false;


class LoginPage extends StatefulWidget {
  static String tag = 'login-page';
  @override
  LoginPageState createState() {
    return new LoginPageState();
  }
}

class LoginPageState extends State<LoginPage> {
  final DocumentReference documentReference =
  Firestore.instance.document("Doctors/$docid");
  StreamSubscription <DocumentSnapshot> subscription;

  Future<bool> doesNameAlreadyExist(String name, String collection,
      String Field) async {
    final QuerySnapshot result = await Firestore.instance
        .collection(collection)
        .where(Field, isEqualTo: name)
        .limit(1)
        .getDocuments();
    final List<DocumentSnapshot> documents = result.documents;
    final result1 = documents.length == 1;
    setState(() {
      exist = result1;
    });
    return result1;
  }

  @override
  Widget build(BuildContext context) {
    final Screensize = MediaQuery
        .of(context)
        .size;
    final logo = Hero(
      tag: 'hero',
      child: CircleAvatar(
        backgroundColor: Colors.transparent,
        radius: 48.0,
        child: Image.asset('lib/images/logo.png'),
      ),
    );

    final email = TextFormField(
      keyboardType: TextInputType.emailAddress,
      autofocus: false,
      decoration: InputDecoration(
        hintText: 'Enter Your ID Code',
        contentPadding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
        border: OutlineInputBorder(borderRadius: BorderRadius.circular(32.0)),
      ),
      controller: Controller,
    );

    final loginButton = Padding(
      padding: EdgeInsets.symmetric(vertical: 16.0),
      child: Material(
        borderRadius: BorderRadius.circular(30.0),
        shadowColor: Colors.lightBlueAccent.shade100,
        elevation: 5.0,
        child: MaterialButton(
          minWidth: Screensize.width / 1.8,
          height: 42.0,
          onPressed: () {
            doesNameAlreadyExist(Controller.text, "Ids", "ID").then((value){
              if(value==true){
                subscription = documentReference.snapshots().listen((datasnapshot) {
                  if(datasnapshot.exists){
                    Navigator.push(
                      context,
                      MaterialPageRoute(
                          builder: (context) => DoctorsArea()),
                    );
                  }else if(!datasnapshot.exists){
                    Navigator.push(
                      context,
                      MaterialPageRoute(
                          builder: (context) => Submit()),
                    );
                  }

                });


              } else if(value!=true){
                print("wrong creds");
              }
            });

          },
          color: Colors.lightBlueAccent,
          child: Text('Continue', style: TextStyle(color: Colors.white)),
        ),
      ),
    );

    return Scaffold(
      backgroundColor: Colors.white,
      body: Center(
        child: ListView(
          shrinkWrap: true,
          padding: EdgeInsets.only(left: 24.0, right: 24.0),
          children: <Widget>[
            logo,
            SizedBox(height: Screensize.height / 13.3),
            email,
            SizedBox(height: 8.0),
            SizedBox(height: 24.0),
            loginButton,
            FutureBuilder(
              future: doesNameAlreadyExist(Controller.text, "Ids", "ID"),
              builder: (context, AsyncSnapshot<bool> result) {
                if (!result.hasData)
                  return Container(); // future still needs to be finished (loading)
                if (result
                    .data) { // result.data is the returned bool from doesNameAlreadyExists
                  return Text("Your ID exists");
                }
                else
                  return Text("Your ID does not exist");
              },
            ),
          ],
        ),
      ),
    );
  }
}