import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:dubp/dubp.dart';
import 'dart:io';
import 'dart:async';
import 'package:path_provider/path_provider.dart';
import 'package:pin_code_fields/pin_code_fields.dart';
import 'package:sentry/sentry.dart' as sentry;

class WalletOptions extends StatefulWidget {
  const WalletOptions({Key keyMyWallets, @required this.walletName})
      : super(key: keyMyWallets);

  final String walletName;
  @override
  WalletOptionsState createState() => WalletOptionsState();
}

class WalletOptionsState extends State<WalletOptions> {
  StreamController<ErrorAnimationType> errorController;
  Directory appPath;
  TextEditingController _pubkey = new TextEditingController();
  TextEditingController _enterPin = new TextEditingController();
  final formKey = GlobalKey<FormState>();
  bool hasError = false;
  String validPin = 'NO PIN';
  var pinColor = Color(0xffF9F9F1);

  void initState() {
    super.initState();
    errorController = StreamController<ErrorAnimationType>();
    DubpRust.setup();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        resizeToAvoidBottomInset: false,
        appBar: AppBar(
            title: SizedBox(
          height: 25,
          child: Text(widget.walletName),
        )),
        body: Center(
            child: SafeArea(
                child: Column(children: <Widget>[
          InkWell(
            child: TextField(
                enabled: false,
                controller: this._pubkey,
                maxLines: 1,
                textAlign: TextAlign.center,
                decoration: InputDecoration(),
                style: TextStyle(
                    fontSize: 14.0,
                    color: Colors.black,
                    fontWeight: FontWeight.bold)),
            onTap: () {
              // deleteWallet(widget.walletName);
              // _keyHistory.currentState.scan();
            },
          ),
          SizedBox(height: 12),
          Form(
            key: formKey,
            child: Padding(
                padding:
                    const EdgeInsets.symmetric(vertical: 8.0, horizontal: 30),
                child: PinCodeTextField(
                  appContext: context,
                  pastedTextStyle: TextStyle(
                    color: Colors.green.shade600,
                    fontWeight: FontWeight.bold,
                  ),
                  length: 6,
                  obscureText: false,
                  obscuringCharacter: '*',
                  animationType: AnimationType.fade,
                  validator: (v) {
                    if (v.length < 6) {
                      return "Votre code PIN fait 6 caractères";
                    } else {
                      return null;
                    }
                  },
                  pinTheme: PinTheme(
                    shape: PinCodeFieldShape.box,
                    borderRadius: BorderRadius.circular(5),
                    fieldHeight: 60,
                    fieldWidth: 50,
                    activeFillColor: hasError ? Colors.orange : Colors.white,
                  ),
                  cursorColor: Colors.black,
                  animationDuration: Duration(milliseconds: 300),
                  textStyle: TextStyle(fontSize: 20, height: 1.6),
                  backgroundColor: pinColor,
                  enableActiveFill: false,
                  errorAnimationController: errorController,
                  controller: _enterPin,
                  keyboardType: TextInputType.text,
                  boxShadows: [
                    BoxShadow(
                      offset: Offset(0, 1),
                      color: Colors.black12,
                      blurRadius: 10,
                    )
                  ],
                  onCompleted: (v) async {
                    print("Completed");
                    final resultWallet = await readLocalWallet(v.toUpperCase());
                    if (resultWallet == 'bad') {
                      errorController.add(ErrorAnimationType
                          .shake); // Triggering error shake animation
                      setState(() {
                        hasError = true;
                        pinColor = Colors.red[200];
                      });
                    } else {
                      setState(() {
                        pinColor = Colors.green[200];
                      });
                    }
                  },
                  onChanged: (value) {
                    if (pinColor != Color(0xffF9F9F1)) {
                      setState(() {
                        pinColor = Color(0xffF9F9F1);
                      });
                    }
                    print(value);
                  },
                )),
          ),
          SizedBox(
            height: 100,
          ),
          SizedBox(
              height: 80,
              child: ElevatedButton(
                  style: ElevatedButton.styleFrom(
                    elevation: 2,
                    primary: Colors.red, //Color(0xffFFD68E), // background
                    onPrimary: Colors.black, // foreground
                  ),
                  onPressed: () {
                    deleteWallet(widget.walletName);
                  },
                  child: Text('Supprimer ce portefeuille',
                      style: TextStyle(fontSize: 25))))
        ]))));
  }

  Future getPubkeyFromDewif(_dewif, _pin) async {
    String _pubkey;
    RegExp regExp = new RegExp(
      r'^[A-Z0-9]+$',
      caseSensitive: false,
      multiLine: false,
    );

    if (regExp.hasMatch(_pin) == true && _pin.length == 6) {
      print("Le format du code PIN est correct.");
    } else {
      print('Format de code PIN invalide');
      return 'false';
    }
    try {
      _pubkey = await DubpRust.getDewifPublicKey(dewif: _dewif, pin: _pin);
      setState(() {
        this._pubkey.text = _pubkey;
      });

      return _pubkey;
    } catch (e, stack) {
      print('Bad PIN code !');
      print(e);
      if (kReleaseMode) {
        await sentry.Sentry.captureException(
          e,
          stackTrace: stack,
        );
      }
      return 'false';
    }
  }

  Future readLocalWallet(String _pin) async {
    // print(pin);
    try {
      final file = await _localWallet(widget.walletName);
      String _localDewif = await file.readAsString();
      String _localPubkey;

      if ((_localPubkey = await getPubkeyFromDewif(_localDewif, _pin)) !=
          'false') {
        setState(() {
          this._pubkey.text = _localPubkey;
        });

        return _localDewif;
      } else {
        throw 'Bad pubkey';
      }
    } catch (e) {
      print('ERROR READING FILE: $e');
      setState(() {
        this._pubkey.clear();
      });
      return 'bad';
    }
  }

  Future<int> deleteWallet(_name) async {
    try {
      final appPath = await _localPath;
      final _walletFile = Directory('$appPath/wallets/$_name');
      print('DELETE THAT ?: $_walletFile');

      final bool _answer = await _confirmDeletingWallet();

      if (_answer) {
        _walletFile.deleteSync(recursive: true);
        Navigator.pop(context);
      }
      return 0;
    } catch (e) {
      return 1;
    }
  }

  Future<bool> _confirmDeletingWallet() async {
    return showDialog<bool>(
      context: context,
      barrierDismissible: true, // user must tap button!
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text(
              'Êtes-vous sûr de vouloir supprimer le portefeuille ${widget.walletName} ?'),
          content: SingleChildScrollView(
            child: ListBody(
              children: <Widget>[
                Text(
                    'Vous pourrez restaurer ce portefeuille à tout moment grace à votre phrase de restauration.'),
              ],
            ),
          ),
          actions: <Widget>[
            TextButton(
              child: Text("Non"),
              onPressed: () {
                Navigator.pop(context, false);
              },
            ),
            TextButton(
              child: Text("Oui"),
              onPressed: () {
                Navigator.pop(context, true);
              },
            ),
          ],
        );
      },
    );
  }

  Future<String> get _localPath async {
    final directory = await getApplicationDocumentsDirectory();
    return directory.path;
  }

  Future<File> _localWallet(_name) async {
    final path = await _localPath;
    return File('$path/wallets/$_name/wallet.dewif');
  }
}