import 'dart:typed_data';

import 'package:dmrtd/dmrtd.dart';
import 'package:dmrtd/src/proto/can_key.dart';
import 'package:flutter/material.dart';
import 'package:gascom/widgets/custom_app_bar.dart';

class NfcScreen extends StatefulWidget {
  const NfcScreen({super.key});

  @override
  State<NfcScreen> createState() => _NfcScreenState();
}

class _NfcScreenState extends State<NfcScreen> {
  final NfcProvider _nfc = NfcProvider();
  MrtdData? _mrtdData = MrtdData();
  String _alertMessage = "";
  bool _isReading = false;

  String id = ''; // should change based on user id card (it's the string below the image)
  DateTime dateOfBirth = DateTime(2000, 1, 1); // should change based on user id card
  DateTime dateOfExpiry = DateTime(2029, 1, 1); // should change based on user id card

  @override
  void initState() {
    WidgetsBinding.instance.addPostFrameCallback((_) async {
      try {
        _buttonPressed();
      } catch (e) {
        print(e);
      }
    });

    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      appBar: CustomAppBar(),
      body: SafeArea(
        child: Center(
          child: Text("NFC Screen, Nfc has ti be turned on."),
        ),
      ),
    );
  }

  String formatProgressMsg(String message, int percentProgress) {
    final p = (percentProgress / 20).round();
    final full = "🟢 " * p;
    final empty = "⚪️ " * (5 - p);
    return "$message\n\n$full$empty";
  }

  void _readMRTD({required AccessKey accessKey, bool isPace = false}) async {
    try {
      setState(() {
        _mrtdData = null;
        _alertMessage = "Waiting for Passport tag ...";
        _isReading = true;
      });
      try {
        bool demo = false;
        print("-------------- FIRST -------------");
        if (!demo)
          await _nfc.connect(
              iosAlertMessage: "Hold your phone near Biometric Passport");

        print("-------------- SECOND -------------");
        final passport = Passport(_nfc);

        print("-------------- THIRD -------------");
        setState(() {
          _alertMessage = "Reading Passport ...";
        });

        print("-------------- 4 -------------");
        _nfc.setIosAlertMessage("Trying to read EF.CardAccess ...");
        final mrtdData = MrtdData();

        print("-------------- 5 -------------");
        try {
          mrtdData.cardAccess = await passport.readEfCardAccess();
        } on PassportError {
          print("-------------- 6 -------------");
          //if (e.code != StatusWord.fileNotFound) rethrow;
        }

        _nfc.setIosAlertMessage("Trying to read EF.CardSecurity ...");

        try {
          //mrtdData.cardSecurity = await passport.readEfCardSecurity();
        } on PassportError {
          //if (e.code != StatusWord.fileNotFound) rethrow;
        }

        _nfc.setIosAlertMessage("Initiating session with PACE...");
        //set MrtdData
        mrtdData.isPACE = isPace;
        mrtdData.isDBA = accessKey.PACE_REF_KEY_TAG == 0x01 ? true : false;

        if (isPace) {
          //PACE session
          print("-------------- 7 -------------");
          await passport.startSessionPACE(accessKey, mrtdData.cardAccess!);
        } else {
          print("-------------- 8 -------------");
          //BAC session
          await passport.startSession(accessKey as DBAKey);
        }

        print("-------------- 9 -------------");
        _nfc.setIosAlertMessage(formatProgressMsg("Reading EF.COM ...", 0));
        mrtdData.com = await passport.readEfCOM();

        _nfc.setIosAlertMessage(
            formatProgressMsg("Reading Data Groups ...", 20));

        print("-------------- 10 -------------");
        if (mrtdData.com!.dgTags.contains(EfDG1.TAG)) {
          mrtdData.dg1 = await passport.readEfDG1();
          print("DG1 mrz country: ${mrtdData.dg1?.mrz.country}");
          print("DG1 mrz dateOfBirth: ${mrtdData.dg1?.mrz.dateOfBirth}");
          print("DG1 mrz dateOfExpiry: ${mrtdData.dg1?.mrz.dateOfExpiry}");
          print("DG1 mrz documentCode: ${mrtdData.dg1?.mrz.documentCode}");
          print("DG1 mrz documentNumber: ${mrtdData.dg1?.mrz.documentNumber}");
          print("DG1 mrz firstName: ${mrtdData.dg1?.mrz.firstName}");
          print("DG1 mrz gender: ${mrtdData.dg1?.mrz.gender}");
          print("DG1 mrz lastName: ${mrtdData.dg1?.mrz.lastName}");
          print("DG1 mrz nationality: ${mrtdData.dg1?.mrz.nationality}");
          print("DG1 mrz optionalData: ${mrtdData.dg1?.mrz.optionalData}");
          print("DG1 mrz optionalData2: ${mrtdData.dg1?.mrz.optionalData2}");
          print("DG1 mrz version: ${mrtdData.dg1?.mrz.version}");
        }

        print("-------------- 11 -------------");
        if (mrtdData.com!.dgTags.contains(EfDG2.TAG)) {
          mrtdData.dg2 = await passport.readEfDG2();
          print("DG2 deviceType: ${mrtdData.dg2?.deviceType}");
          print("DG2 expression: ${mrtdData.dg2?.expression}");
          print("DG2 eyeColor: ${mrtdData.dg2?.eyeColor}");
          print("DG2 faceImageType: ${mrtdData.dg2?.faceImageType}");
          print("DG2 facialRecordDataLength: ${mrtdData.dg2?.facialRecordDataLength}");
          print("DG2 featureMask: ${mrtdData.dg2?.featureMask}");
          print("DG2 gender: ${mrtdData.dg2?.gender}");
          print("DG2 hairColor: ${mrtdData.dg2?.hairColor}");
          print("DG2 imageColorSpace: ${mrtdData.dg2?.imageColorSpace}");
          print("DG2 imageData: ${mrtdData.dg2?.imageData}");
          print("DG2 imageHeight: ${mrtdData.dg2?.imageHeight}");
          print("DG2 imageType: ${mrtdData.dg2?.imageType}");
          print("DG2 imageWidth: ${mrtdData.dg2?.imageWidth}");
          print("DG2 lengthOfRecord: ${mrtdData.dg2?.lengthOfRecord}");
          print("DG2 nrFeaturePoints: ${mrtdData.dg2?.nrFeaturePoints}");
          print("DG2 numberOfFacialImages: ${mrtdData.dg2?.numberOfFacialImages}");
          print("DG2 poseAngle: ${mrtdData.dg2?.poseAngle}");
          print("DG2 poseAngleUncertainty: ${mrtdData.dg2?.poseAngleUncertainty}");
          print("DG2 quality: ${mrtdData.dg2?.quality}");
          print("DG2 sourceType: ${mrtdData.dg2?.sourceType}");
          print("DG2 versionNumber: ${mrtdData.dg2?.versionNumber}");
        }

        // To read DG3 and DG4 session has to be established with CVCA certificate (not supported).
        // if(mrtdData.com!.dgTags.contains(EfDG3.TAG)) {
        //   mrtdData.dg3 = await passport.readEfDG3();
        // }

        // if(mrtdData.com!.dgTags.contains(EfDG4.TAG)) {
        //   mrtdData.dg4 = await passport.readEfDG4();
        // }

        if (mrtdData.com!.dgTags.contains(EfDG5.TAG)) {
          mrtdData.dg5 = await passport.readEfDG5();
        }

        if (mrtdData.com!.dgTags.contains(EfDG6.TAG)) {
          mrtdData.dg6 = await passport.readEfDG6();
        }

        if (mrtdData.com!.dgTags.contains(EfDG7.TAG)) {
          mrtdData.dg7 = await passport.readEfDG7();
        }

        if (mrtdData.com!.dgTags.contains(EfDG8.TAG)) {
          mrtdData.dg8 = await passport.readEfDG8();
        }

        if (mrtdData.com!.dgTags.contains(EfDG9.TAG)) {
          mrtdData.dg9 = await passport.readEfDG9();
        }

        if (mrtdData.com!.dgTags.contains(EfDG10.TAG)) {
          mrtdData.dg10 = await passport.readEfDG10();
        }

        if (mrtdData.com!.dgTags.contains(EfDG11.TAG)) {
          mrtdData.dg11 = await passport.readEfDG11();
          print("DG11 custodyInformation: ${mrtdData.dg11?.custodyInformation}");
          print("DG11 ersonalSummary: ${mrtdData.dg11?.ersonalSummary}");
          print("DG11 fullDateOfBirth: ${mrtdData.dg11?.fullDateOfBirth}");
          print("DG11 nameOfHolder: ${mrtdData.dg11?.nameOfHolder}");
          print("DG11 otherNames: ${mrtdData.dg11?.otherNames}");
          print("DG11 otherValidTDNumbers: ${mrtdData.dg11?.otherValidTDNumbers}");
          print("DG11 permanentAddress: ${mrtdData.dg11?.permanentAddress}");
          print("DG11 personalNumber: ${mrtdData.dg11?.personalNumber}");
          print("DG11 placeOfBirth: ${mrtdData.dg11?.placeOfBirth}");
          print("DG11 profession: ${mrtdData.dg11?.profession}");
          print("DG11 proofOfCitizenship: ${mrtdData.dg11?.proofOfCitizenship}");
          print("DG11 telephone: ${mrtdData.dg11?.telephone}");
          print("DG11 title: ${mrtdData.dg11?.title}");
        }

        if (mrtdData.com!.dgTags.contains(EfDG12.TAG)) {
          mrtdData.dg12 = await passport.readEfDG12();
          print("DG12 dateOfIssue: ${mrtdData.dg12?.dateOfIssue}");
          print("DG12 dateOfIssue: ${mrtdData.dg12?.issuingAuthority}");
        }

        if (mrtdData.com!.dgTags.contains(EfDG13.TAG)) {
          mrtdData.dg13 = await passport.readEfDG13();
        }

        if (mrtdData.com!.dgTags.contains(EfDG14.TAG)) {
          mrtdData.dg14 = await passport.readEfDG14();
        }

        if (mrtdData.com!.dgTags.contains(EfDG15.TAG)) {
          mrtdData.dg15 = await passport.readEfDG15();
          _nfc.setIosAlertMessage(formatProgressMsg("Doing AA ...", 60));

          print("DG15 aaPublicKey: ${mrtdData.dg15?.aaPublicKey}");

          mrtdData.aaSig = await passport.activeAuthenticate(Uint8List(8));
        }

        if (mrtdData.com!.dgTags.contains(EfDG16.TAG)) {
          mrtdData.dg16 = await passport.readEfDG16();
        }

        print("-------------- 12 -------------");
        _nfc.setIosAlertMessage(formatProgressMsg("Reading EF.SOD ...", 80));
        mrtdData.sod = await passport.readEfSOD();

        setState(() {
          _mrtdData = mrtdData;
        });

        setState(() {
          _alertMessage = "";
        });
      } on Exception catch (e) {
        final se = e.toString().toLowerCase();
        String alertMsg = "An error has occurred while reading Passport!";
        if (e is PassportError) {
          if (se.contains("security status not satisfied")) {
            alertMsg =
                "Failed to initiate session with passport.\nCheck input data!";
          }
          print("PassportError: ${e.message}");
        } else {
          print(
              "An exception was encountered while trying to read Passport: $e");
        }

        if (se.contains('timeout')) {
          alertMsg = "Timeout while waiting for Passport tag";
        } else if (se.contains("tag was lost")) {
          alertMsg = "Tag was lost. Please try again!";
        } else if (se.contains("invalidated by user")) {
          alertMsg = "";
        }

        setState(() {
          _alertMessage = alertMsg;
        });
      } finally {
        if (_alertMessage.isNotEmpty) {
          await _nfc.disconnect(iosErrorMessage: _alertMessage);
        } else {
          await _nfc.disconnect(
              iosAlertMessage: formatProgressMsg("Finished", 100));
        }
        setState(() {
          _isReading = false;
        });
      }
    } on Exception catch (e) {
      print("Read MRTD error: $e");
    }
  }

  void _readMRTDOld() async {
    try {
      setState(() {
        _mrtdData = null;
        _alertMessage = "Waiting for Passport tag ...";
        _isReading = true;
      });

      await _nfc.connect(
          iosAlertMessage: "Hold your phone near Biometric Passport");
      final passport = Passport(_nfc);

      setState(() {
        _alertMessage = "Reading Passport ...";
      });

      _nfc.setIosAlertMessage("Trying to read EF.CardAccess ...");
      final mrtdData = MrtdData();

      try {
        mrtdData.cardAccess = await passport.readEfCardAccess();
      } on PassportError {
        //if (e.code != StatusWord.fileNotFound) rethrow;
      }

      _nfc.setIosAlertMessage("Trying to read EF.CardSecurity ...");

      try {
        mrtdData.cardSecurity = await passport.readEfCardSecurity();
      } on PassportError {
        //if (e.code != StatusWord.fileNotFound) rethrow;
      }

      _nfc.setIosAlertMessage("Initiating session ...");
      final bacKeySeed = DBAKey(id, dateOfBirth, dateOfExpiry);
      await passport.startSession(bacKeySeed);

      _nfc.setIosAlertMessage(formatProgressMsg("Reading EF.COM ...", 0));
      mrtdData.com = await passport.readEfCOM();

      _nfc.setIosAlertMessage(formatProgressMsg("Reading Data Groups ...", 20));

      if (mrtdData.com!.dgTags.contains(EfDG1.TAG)) {
        mrtdData.dg1 = await passport.readEfDG1();
        print(mrtdData.dg1?.mrz);
      }

      if (mrtdData.com!.dgTags.contains(EfDG2.TAG)) {
        mrtdData.dg2 = await passport.readEfDG2();
        print("DG2 deviceType: ${mrtdData.dg2?.deviceType}");
        print("DG2 expression: ${mrtdData.dg2?.expression}");
        print("DG2 eyeColor: ${mrtdData.dg2?.eyeColor}");
        print("DG2 faceImageType: ${mrtdData.dg2?.faceImageType}");
        print("DG2 facialRecordDataLength: ${mrtdData.dg2?.facialRecordDataLength}");
        print("DG2 featureMask: ${mrtdData.dg2?.featureMask}");
        print("DG2 fid: ${mrtdData.dg2?.fid}");
        print("DG2 gender: ${mrtdData.dg2?.gender}");
        print("DG2 hairColor: ${mrtdData.dg2?.hairColor}");
        print("DG2 imageColorSpace: ${mrtdData.dg2?.imageColorSpace}");
        print("DG2 imageData: ${mrtdData.dg2?.imageData}");
        print("DG2 imageHeight: ${mrtdData.dg2?.imageHeight}");
        print("DG2 imageType: ${mrtdData.dg2?.imageType}");
        print("DG2 imageWidth: ${mrtdData.dg2?.imageWidth}");
        print("DG2 nrFeaturePoints: ${mrtdData.dg2?.nrFeaturePoints}");
        print("DG2 numberOfFacialImages: ${mrtdData.dg2?.numberOfFacialImages}");
        print("DG2 lengthOfRecord: ${mrtdData.dg2?.lengthOfRecord}");
        print("DG2 poseAngle: ${mrtdData.dg2?.poseAngle}");
        print("DG2 poseAngleUncertainty: ${mrtdData.dg2?.poseAngleUncertainty}");
        print("DG2 quality: ${mrtdData.dg2?.quality}");
        print("DG2 sourceType: ${mrtdData.dg2?.sourceType}");
        print("DG2 versionNumber: ${mrtdData.dg2?.versionNumber}");
        print("DG2 tag: ${mrtdData.dg2?.tag}");
        print("DG2 sfi: ${mrtdData.dg2?.sfi}");
      }

      // To read DG3 and DG4 session has to be established with CVCA certificate (not supported).
      // if(mrtdData.com!.dgTags.contains(EfDG3.TAG)) {
      //   mrtdData.dg3 = await passport.readEfDG3();
      // }

      // if(mrtdData.com!.dgTags.contains(EfDG4.TAG)) {
      //   mrtdData.dg4 = await passport.readEfDG4();
      // }

      if (mrtdData.com!.dgTags.contains(EfDG5.TAG)) {
        mrtdData.dg5 = await passport.readEfDG5();
      }

      if (mrtdData.com!.dgTags.contains(EfDG6.TAG)) {
        mrtdData.dg6 = await passport.readEfDG6();
      }

      if (mrtdData.com!.dgTags.contains(EfDG7.TAG)) {
        mrtdData.dg7 = await passport.readEfDG7();
      }

      if (mrtdData.com!.dgTags.contains(EfDG8.TAG)) {
        mrtdData.dg8 = await passport.readEfDG8();
      }

      if (mrtdData.com!.dgTags.contains(EfDG9.TAG)) {
        mrtdData.dg9 = await passport.readEfDG9();
      }

      if (mrtdData.com!.dgTags.contains(EfDG10.TAG)) {
        mrtdData.dg10 = await passport.readEfDG10();
      }

      if (mrtdData.com!.dgTags.contains(EfDG11.TAG)) {
        mrtdData.dg11 = await passport.readEfDG11();
        print("DG11 custodyInformation: ${mrtdData.dg11?.custodyInformation}");
        print("DG11 ersonalSummary: ${mrtdData.dg11?.ersonalSummary}");
        print("DG11 fullDateOfBirth: ${mrtdData.dg11?.fullDateOfBirth}");
        print("DG11 nameOfHolder: ${mrtdData.dg11?.nameOfHolder}");
        print("DG11 otherNames: ${mrtdData.dg11?.otherNames}");
        print("DG11 otherValidTDNumbers: ${mrtdData.dg11?.otherValidTDNumbers}");
        print("DG11 permanentAddress: ${mrtdData.dg11?.permanentAddress}");
        print("DG11 personalNumber: ${mrtdData.dg11?.personalNumber}");
        print("DG11 placeOfBirth: ${mrtdData.dg11?.placeOfBirth}");
        print("DG11 profession: ${mrtdData.dg11?.profession}");
        print("DG11 proofOfCitizenship: ${mrtdData.dg11?.proofOfCitizenship}");
        print("DG11 telephone: ${mrtdData.dg11?.telephone}");
        print("DG11 title: ${mrtdData.dg11?.title}");
      }

      if (mrtdData.com!.dgTags.contains(EfDG12.TAG)) {
        mrtdData.dg12 = await passport.readEfDG12();
        print("DG12 dateOfIssue: ${mrtdData.dg12?.dateOfIssue}");
        print("DG12 issuingAuthority: ${mrtdData.dg12?.issuingAuthority}");
      }

      if (mrtdData.com!.dgTags.contains(EfDG13.TAG)) {
        mrtdData.dg13 = await passport.readEfDG13();
      }

      if (mrtdData.com!.dgTags.contains(EfDG14.TAG)) {
        mrtdData.dg14 = await passport.readEfDG14();
      }

      if (mrtdData.com!.dgTags.contains(EfDG15.TAG)) {
        mrtdData.dg15 = await passport.readEfDG15();
        print("DG12 issuingAuthority: ${mrtdData.dg15?.aaPublicKey}");
        _nfc.setIosAlertMessage(formatProgressMsg("Doing AA ...", 60));
        mrtdData.aaSig = await passport.activeAuthenticate(Uint8List(8));
      }

      if (mrtdData.com!.dgTags.contains(EfDG16.TAG)) {
        mrtdData.dg16 = await passport.readEfDG16();
      }

      _nfc.setIosAlertMessage(formatProgressMsg("Reading EF.SOD ...", 80));
      mrtdData.sod = await passport.readEfSOD();

      setState(() {
        _mrtdData = mrtdData;
      });

      setState(() {
        _alertMessage = "";
      });
    } on Exception catch (e) {
      final se = e.toString().toLowerCase();
      String alertMsg = "An error has occurred while reading Passport!";
      if (e is PassportError) {
        if (se.contains("security status not satisfied")) {
          alertMsg =
              "Failed to initiate session with passport.\nCheck input data!";
        }
        print("PassportError: ${e.message}");
      } else {
        print("An exception was encountered while trying to read Passport: $e");
      }

      if (se.contains('timeout')) {
        alertMsg = "Timeout while waiting for Passport tag";
      } else if (se.contains("tag was lost")) {
        alertMsg = "Tag was lost. Please try again!";
      } else if (se.contains("invalidated by user")) {
        alertMsg = "";
      }

      setState(() {
        _alertMessage = alertMsg;
      });
    } finally {
      if (_alertMessage.isNotEmpty) {
        await _nfc.disconnect(iosErrorMessage: _alertMessage);
      } else {
        await _nfc.disconnect(
            iosAlertMessage: formatProgressMsg("Finished", 100));
      }
      setState(() {
        _isReading = false;
      });
    }
  }

  void _buttonPressed() async {
    String _can = "";
    print("Button pressed");
    //Check on what tab we are
    if (true) {
      //DBA tab
      // String errorText = "";
      // if (_doe.text.isEmpty) {
      //   errorText += "Please enter date of expiry!\n";
      // }
      // if (_dob.text.isEmpty) {
      //   errorText += "Please enter date of birth!\n";
      // }
      // if (_docNumber.text.isEmpty) {
      //   errorText += "Please enter passport number!";
      // }

      // setState(() {
      //   _alertMessage = errorText;
      // });
      // //If there is an error, just jump out of the function
      // if (errorText.isNotEmpty) return;

      final bacKeySeed = DBAKey(id, dateOfBirth, dateOfExpiry, paceMode: true);
      _readMRTD(accessKey: bacKeySeed, isPace: true);
    } else {
      // PACE tab
      // String errorText = "";
      // if (_can.isEmpty) {
      //   errorText = "Please enter CAN number!";
      // } else if (_can.text.length != 6) {
      //   errorText = "CAN number must be exactly 6 digits long!";
      // }

      // setState(() {
      //   _alertMessage = errorText;
      // });
      // //If there is an error, just jump out of the function
      // if (errorText.isNotEmpty) return;

      // final canKeySeed = CanKey(_can.text);
      final canKeySeed = CanKey(id);
      _readMRTD(accessKey: canKeySeed, isPace: true);
    }
  }
}

class MrtdData {
  EfCardAccess? cardAccess;
  EfCardSecurity? cardSecurity;
  EfCOM? com;
  EfSOD? sod;
  EfDG1? dg1;
  EfDG2? dg2;
  EfDG3? dg3;
  EfDG4? dg4;
  EfDG5? dg5;
  EfDG6? dg6;
  EfDG7? dg7;
  EfDG8? dg8;
  EfDG9? dg9;
  EfDG10? dg10;
  EfDG11? dg11;
  EfDG12? dg12;
  EfDG13? dg13;
  EfDG14? dg14;
  EfDG15? dg15;
  EfDG16? dg16;
  Uint8List? aaSig;
  bool? isPACE;
  bool? isDBA;
}

final Map<DgTag, String> dgTagToString = {
  EfDG1.TAG: 'EF.DG1',
  EfDG2.TAG: 'EF.DG2',
  EfDG3.TAG: 'EF.DG3',
  EfDG4.TAG: 'EF.DG4',
  EfDG5.TAG: 'EF.DG5',
  EfDG6.TAG: 'EF.DG6',
  EfDG7.TAG: 'EF.DG7',
  EfDG8.TAG: 'EF.DG8',
  EfDG9.TAG: 'EF.DG9',
  EfDG10.TAG: 'EF.DG10',
  EfDG11.TAG: 'EF.DG11',
  EfDG12.TAG: 'EF.DG12',
  EfDG13.TAG: 'EF.DG13',
  EfDG14.TAG: 'EF.DG14',
  EfDG15.TAG: 'EF.DG15',
  EfDG16.TAG: 'EF.DG16'
};