import 'package:flutter/material.dart';
import 'package:simple_animations/simple_animations.dart';
import 'FadeAnimation.dart';
import 'ComputePower.dart';
import 'package:flutter/services.dart';

class HomeScreen extends StatefulWidget {

  @override
  State<StatefulWidget> createState() => new _State();
}

class _State extends State<HomeScreen> {
  final myController = TextEditingController();

	var bill;
    
    @override
    void initState() {
    super.initState();
    bill = ComputePower.rating(double.parse(myController.text));
    }

  @override
  void dispose() {
    
    super.dispose();
    // Clean up the controller when the widget is disposed.
    myController.dispose();
  }

  Widget build(BuildContext context) {

    return Scaffold(
      //appBar: AppBar(
      // title: Text('Login Screen App'),
      //),
      body: Padding(
        padding: EdgeInsets.all(30),
        child: ListView(
          children: <Widget>[
            FadeAnimation(1.1, new Container(
              alignment: Alignment.center,
              padding: EdgeInsets.all(20),
              child: Text(
                (bill.toString()),
                style: TextStyle(
                    color: Colors.blue,
                    fontWeight: FontWeight.w500,
                    fontSize: 30),
              ),
            ),
            ),
                FadeAnimation(1.3, new Container(
                    alignment: Alignment.center,
                    padding: EdgeInsets.only(top: 350.0),
                    child: Text(
                      'EDLBill',
                      style: TextStyle(
                          color: Colors.blue,
                          fontWeight: FontWeight.w500,
                          fontSize: 30),
                    ),
    ),
    ),
                SizedBox(height: 5),
                FadeAnimation(1.6, Container(
                  padding: EdgeInsets.all(10),
                  child: TextFormField(
                    controller: myController,
                    decoration: InputDecoration(
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(25.0),
                        borderSide: BorderSide(),),
                      labelText: 'Enter KWH Usage',
                      hintText: "Your KWH usage?",
                    ),
                    validator: (val) {
                      if (val.length == 0) {
                        return "Please enter your KWH Usage";
                      } else {
                        return null;
                      }
                    },
                    keyboardType: TextInputType.number,
                  ),
                ),
                ),
                FadeAnimation(1.9, Container(
                  child: Center(
                    //height: 50,
                    //padding: EdgeInsets.fromLTRB(10, 0, 10, 0),
                    child: RaisedButton(
                      textColor: Colors.white,
                      color: Colors.blue,
                      child: Text('Print Bill'),
                      onPressed: () {
                        //print(myController.text);
                        //var consumption = myController.text;
                        print(bill.toString());
                        bill;
                      },
                    ),
                  ),
                ),
                ),
          ],
        ),
      ),
    );
  }
}