import 'dart:async';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:local_spend/common/apifunctions/request_login_api.dart';
import 'package:local_spend/common/functions/show_dialog_single_button.dart';
import 'package:local_spend/common/platform/platform_scaffold.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:url_launcher/url_launcher.dart';

const URL = "https://flutter.io/";

class LoginPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return new LoginPageState();
  }
}

class LoginPageState extends State<LoginPage> {
  final TextEditingController _emailController = TextEditingController(text: 'test@example.com'); // remove
  final TextEditingController _passwordController = TextEditingController(text: 'abc123');        // remove

  FocusNode focusNode;  // added so focus can move automatically

  Future launchURL(String url) async {
    if (await canLaunch(url)) {
      await launch(url, forceSafariVC: true, forceWebView: true);
    } else {
      showDialogSingleButton(
          context,
          "Unable to reach your website.",
          "Currently unable to reach the website $URL. Please try again at a later time.",
          "OK");
    }
  }

  @override
  void initState() {
    super.initState();
    _saveCurrentRoute("/LoginPage");

    focusNode = FocusNode();
  }

  @override
  void dispose() {
    focusNode.dispose(); //disposes focus node when form disposed
    super.dispose();
  }

  _saveCurrentRoute(String lastRoute) async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    await preferences.setString('LastPageRoute', lastRoute);
  }

  void login(String username, String password) {
    SystemChannels.textInput.invokeMethod('TextInput.hide');
    requestLoginAPI(context, username,
        password);
  }

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () {
        if (Navigator.canPop(context)) {
          Navigator.of(context).pushNamedAndRemoveUntil(
              '/HomePage', (Route<dynamic> route) => false);
        } else {
          Navigator.of(context).pushReplacementNamed('/HomePage');
        }
      },
      child: PlatformScaffold(
//        drawer: BasicDrawer(),
        appBar: AppBar(
          title: Text(
            "LOGIN",
            style: TextStyle(
              fontSize: 30.0,
              color: Colors.black,
            ),
          ),
          centerTitle: true,
          iconTheme: IconThemeData(color: Colors.black),
        ),
        body: Container(
          child: Padding(
            padding: EdgeInsets.fromLTRB(30.0, 0.0, 30.0, 0.0),
            child: ListView(
              children: <Widget>[
                Container(
                    alignment: Alignment.topCenter,
                    child: Padding(
                      padding: EdgeInsets.fromLTRB(0.0, 40.0, 0.0, 15.0),
                      child: Text(
                        "Local Loop",
                        style: TextStyle(fontSize: 40.0, color: Colors.black),
                      ),
                    )),
                Padding(
                  padding: EdgeInsets.fromLTRB(0.0, 5.0, 0.0, 78.0),
                  child: RichText(
                    text: TextSpan(
                      children: [
                        TextSpan(
                          text:
                          'This is the logon page.',
                          style: new TextStyle(
                            fontSize: 20.0,
                            color: Colors.black,
                          ),
                        ),
                        TextSpan(
                          text:
                          ' It is currently in development.',
                          style: new TextStyle(
                            fontSize: 20.0,
                            color: Colors.black,
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
                Text(
                  "EMAIL",
                  style: TextStyle(
                    fontSize: 16.0,
                    color: Colors.black,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                Padding(
                  padding: EdgeInsets.fromLTRB(0.0, 5.0, 0.0, 0.0),
                  child: TextField(
                    controller: _emailController,
                    decoration: InputDecoration(
                      hintText: "Use your login email",
                    ),
                    style: TextStyle(
                      fontSize: 18.0,
                      color: Colors.grey[800],
                      fontWeight: FontWeight.bold,
                    ),
                    onSubmitted: (_) {
                      FocusScope.of(context).requestFocus(focusNode);
                    },
                  ),
                ),
                Padding(
                  padding: EdgeInsets.fromLTRB(0.0, 35.0, 0.0, 0.0),
                  child: Text(
                    "PASSWORD",
                    style: TextStyle(
                      fontSize: 16.0,
                      color: Colors.black,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
                Padding(
                  padding: EdgeInsets.fromLTRB(0.0, 5.0, 0.0, 0.0),
                  child: TextField(
                    controller: _passwordController,
                    focusNode: focusNode,
                    decoration: InputDecoration(
                      hintText: 'Your password, keep it secret, keep it safe.',
                    ),
                    obscureText: true,
                    style: TextStyle(
                      fontSize: 18.0,
                      color: Colors.grey[800],
                      fontWeight: FontWeight.bold,
                    ),
                    onSubmitted: (_) {
                      login( _emailController.text,
                          _passwordController.text);
                    },
                  ),
                ),
                Padding(
                  padding: EdgeInsets.fromLTRB(0.0, 70.0, 0.0, 0.0),
                  child: Container(
                    height: 65.0,
                    child: RaisedButton(
                      onPressed: () {
                        login( _emailController.text,
                            _passwordController.text);
//                        showDialog(
//                          barrierDismissible: false,
//                        );
//                        print("pressed");
                      },
                      child: Text("LOGIN",
                          style:
                          TextStyle(color: Colors.white, fontSize: 22.0)),
                      color: Colors.blue,
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}