doctor_app_flutter/lib/widgets/auth/known_user_login.dart

import 'dart:collection';
import 'dart:ffi';

import 'package:doctor_app_flutter/config/config.dart';
import 'package:doctor_app_flutter/routes.dart';
import 'package:doctor_app_flutter/util/dr_app_shared_pref.dart';
import 'package:doctor_app_flutter/util/dr_app_toast_msg.dart';
import 'package:doctor_app_flutter/widgets/shared/dr_app_circular_progress_Indeicator.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:hexcolor/hexcolor.dart';
import 'package:local_auth/local_auth.dart';
import 'package:shared_preferences/shared_preferences.dart';

DrAppSharedPreferances sharedPref = new DrAppSharedPreferances();
DrAppToastMsg toastMsg = DrAppToastMsg();

class KnownUserLogin extends StatefulWidget {
  @override
  _KnownUserLoginState createState() => _KnownUserLoginState();
}

class _KnownUserLoginState extends State<KnownUserLogin> {
  Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
  final LocalAuthentication auth = LocalAuthentication();
  String _authorized = "not Authorized";
  bool _isAuthenticating = false;
  Future<String> loggedUserFuture;
  var loggedUser;
  Future<void> getSharedPref() async {
    sharedPref.getObj('loggedUser').then((userInfo) {
      // if(loggedUser == null){}
      loggedUser = userInfo;
      // print('dddddddddddddddd${loggedUser}');
    });
  }

  @override
  void initState() {
    super.initState();
    loggedUserFuture = _prefs.then((SharedPreferences prefs) {
      return (prefs.getString('platformImei'));
    });
  }

  @override
  Widget build(BuildContext context) {
    getSharedPref();

    return FutureBuilder(
        future: loggedUserFuture,
        builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
          switch (snapshot.connectionState) {
            case ConnectionState.waiting:
              return DrAppCircularProgressIndeicator();
            default:
              if (snapshot.hasError) {
                return Text('Error: ${snapshot.error}');
              } else {
                return LayoutBuilder(
                  builder: (ctx, constraints) {
                    int maxSmallScreenSize = MAX_SMALL_SCREEN;
                    bool isSmallScreen =
                        constraints.maxWidth <= maxSmallScreenSize;
                    return Column(
                      mainAxisAlignment: MainAxisAlignment.start,
                      children: <Widget>[
                        Stack(children: [
                          Container(
                            decoration: BoxDecoration(
                                border: Border.all(
                                  color: Hexcolor('#CCCCCC'),
                                ),
                                borderRadius: BorderRadius.circular(50)),
                            margin: const EdgeInsets.fromLTRB(0, 20.0, 30, 0),
                            child: Row(
                              // mainAxisAlignment: MainAxisAlignment.spaceBetween,
                              children: <Widget>[
                                Container(
                                    height: 100,
                                    width: 100,
                                    decoration: new BoxDecoration(
                                        // color: Colors.green, // border color
                                        shape: BoxShape.circle,
                                        border: Border.all(
                                            color: Hexcolor('#CCCCCC'))),
                                    child: CircleAvatar(
                                      child: Image.asset(
                                        'assets/images/dr_avatar.png',
                                        fit: BoxFit.cover,
                                      ),
                                    )),
                                Container(
                                  margin: EdgeInsets.symmetric(
                                      vertical: 3, horizontal: 15),
                                  child: Column(
                                    //  mainAxisAlignment: MainAxisAlignment.start,
                                    crossAxisAlignment:
                                        CrossAxisAlignment.start,
                                    children: <Widget>[
                                      Text(
                                        loggedUser['List_MemberInformation'][0]
                                            ['MemberName'],
                                        style: TextStyle(
                                            color: Hexcolor('515A5D'),
                                            fontSize: isSmallScreen
                                                ? 24
                                                : constraints.maxWidth * 0.029,
                                            fontWeight: FontWeight.w800),
                                      ),
                                      Text(
                                        'ENT Spec',
                                        style: TextStyle(
                                            color: Hexcolor('515A5D'),
                                            fontSize: isSmallScreen
                                                ? 20
                                                : constraints.maxWidth * 0.025),
                                      )
                                    ],
                                  ),
                                )
                              ],
                            ),
                          ),
                          Positioned(
                              top: 7,
                              right: 70,
                              child: Image.asset(
                                'assets/images/close_icon.png',
                                fit: BoxFit.cover,
                              ))
                        ]),
                        Container(
                            height: 200,
                            width: 200,
                            child: Center(
                              child: Image.asset(
                                'assets/images/verification_fingerprint_lg_icon.png',
                                fit: BoxFit.cover,
                              ),
                            )),
                        buildButtonsContainer(
                            isSmallScreen, constraints, context)
                      ],
                    );
                  },
                );
              }
          }
        });
  }

  //
  Container buildButtonsContainer(
      bool isSmallScreen, BoxConstraints constraints, BuildContext context) {
    return Container(
      margin: EdgeInsetsDirectional.fromSTEB(0, 0, 30, 0),
      width: double.infinity,
      child: Column(
        children: <Widget>[
          RaisedButton(
            onPressed: _silentLogin,
            elevation: 0.0,
            child: Container(
              width: double.infinity,
              height: 50,
              child: Center(
                child: Text(
                  "Verify using FingerPRint".toUpperCase(),
                  // textAlign: TextAlign.center,
                  style: TextStyle(
                      color: Colors.white,
                      fontSize:
                          isSmallScreen ? 20 : constraints.maxWidth * 0.029),
                ),
              ),
            ),
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(10),
                side: BorderSide(width: 0.5, color: Hexcolor('#CCCCCC'))),
          ),
          SizedBox(
            height: 10,
          ),
          Container(
            width: double.infinity,
            height: 50,
            child: FlatButton(
                onPressed: () {
                  navigateToMoreOption();
                },
                shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(10),
                    side: BorderSide(
                        width: 1, color: Theme.of(context).primaryColor)),
                child: Text(
                  "More verification Options".toUpperCase(),
                  style: TextStyle(
                      color: Theme.of(context).primaryColor,
                      fontSize:
                          isSmallScreen ? 20 : constraints.maxWidth * 0.029),
                )),
          ),
          SizedBox(
            height: 20,
          ),
        ],
      ),
    );
  }

  navigateToMoreOption() {
    Navigator.of(context).pushNamed('routeName');
  }

  _silentLogin() {
    _authenticate().then((_) {
      // print('$val');
      print(_authorized);
    });
  }

  Future<void> _authenticate() async {
    _getAvailableBiometrics();
    bool authenticated = false;
    try {
      setState(() {
        _isAuthenticating = true;
        _authorized = 'Authenticating';
      });
      authenticated = await auth.authenticateWithBiometrics(
          localizedReason: 'Scan your fingerprint to authenticate',
          useErrorDialogs: true,
          stickyAuth: false);
      setState(() {
        _isAuthenticating = false;
        _authorized = 'Authenticating';
      });
    } on PlatformException catch (e) {
      print(e);
    }
    if (!mounted) return;

    final String message = authenticated ? 'Authorized' : 'Not Authorized';
    if (message == 'Authorized') {
      navigateToHome();
    }
    setState(() {
      print('_authorized' + _authorized);
      _authorized = message;
      print('_authorized' + _authorized);
    });
  }

  Future<void> _getAvailableBiometrics() async {
    List<BiometricType> availableBiometrics;
    try {
      availableBiometrics = await auth.getAvailableBiometrics();
    } on PlatformException catch (e) {
      print(e);
    }
    if (!mounted) return;

    setState(() {
      print('availableBiometrics $availableBiometrics');
    });
  }

  navigateToHome() {
    Navigator.of(context).pushNamed(HOME);
  }

  showErorrMsg(localMsg) {
    toastMsg.showErrorToast(localMsg);
  }
}