// import 'dart:async';
// import 'package:flutter/foundation.dart';
// import 'package:shared_preferences/shared_preferences.dart';
// import 'package:jwt_decode/jwt_decode.dart';
// import 'TokenService.dart';
//
// class SessionManager {
//   static final SessionManager _instance = SessionManager._internal();
//   factory SessionManager() => _instance;
//   SessionManager._internal();
//
//   SharedPreferences? prefs;
//   final StreamController<void> _sessionController = StreamController.broadcast();
//
//   Stream<void> get sessionStream => _sessionController.stream;
//
//   bool sessionReady = false;
//
//   /// ===== Post Enrollment Fields =====
//   String? mobileNo;
//   String? empClientBranchId;
//   String? empCodeString;
//   String? gpaEmpName;
//   String? empPrimaryId;
//   String? client_id;
//   String? emp_status;
//
//   /// ===== Pre Enrollment Fields =====
//   String? enrollmentEmpClientBranchId;
//   String? enrollmentEmpCodeString;
//   String? enrollmentEmpPrimaryId;
//   String? enrollmentGpaEmpName;
//   String? enrollmentClient_id;
//   String? enrollmentEmp_status;
//
//     /// Save Post Enrollment Token
//   Future<void> initializeFromPostToken(String token) async {
//     Map<String, dynamic> decoded = Jwt.parseJwt(token);
//
//     final prefs = await SharedPreferences.getInstance();
//
//     mobileNo = decoded['mobile'];
//     empClientBranchId = decoded['client_branch_id'];
//     empCodeString = decoded['emp_code']?.toString();
//     gpaEmpName = decoded['name']?.toString();
//     empPrimaryId = decoded['id']?.toString();
//     client_id = decoded['client_id']?.toString();
//     emp_status = decoded['emp_status']?.toString();
//
//     // persist
//     prefs.setString('mobileNo', mobileNo ?? '');
//     prefs.setString('empCodeString', empCodeString ?? '');
//     prefs.setString('gpaEmpName', gpaEmpName ?? '');
//     prefs.setString('empPrimaryId', empPrimaryId ?? '');
//     prefs.setString('client_id', client_id ?? '');
//     prefs.setString('empClientBranchId', empClientBranchId ?? '');
//     prefs.setString('emp_status', emp_status ?? '');
//
//     debugPrint('Post Session initialized: $decoded');
//   }
//
//   /// Save Pre Enrollment Token
//   Future<void> initializeFromPreToken(String token) async {
//     Map<String, dynamic> decoded = Jwt.parseJwt(token);
//
//     final prefs = await SharedPreferences.getInstance();
//
//     enrollmentEmpClientBranchId = decoded['client_branch_id'];
//     enrollmentEmpCodeString = decoded['emp_code']?.toString();
//     enrollmentEmpPrimaryId = decoded['id']?.toString();
//     enrollmentGpaEmpName = decoded['name']?.toString();
//     enrollmentClient_id = decoded['client_id']?.toString();
//     enrollmentEmp_status = decoded['emp_status']?.toString();
//
//     // persist
//     prefs.setString('enrollmentEmpClientBranchId', enrollmentEmpClientBranchId ?? '');
//     prefs.setString('enrollmentEmpCodeString', enrollmentEmpCodeString ?? '');
//     prefs.setString('enrollmentEmpPrimaryId', enrollmentEmpPrimaryId ?? '');
//     prefs.setString('enrollmentGpaEmpName', enrollmentGpaEmpName ?? '');
//     prefs.setString('enrollmentClient_id', enrollmentClient_id ?? '');
//     prefs.setString('enrollmentEmp_status', enrollmentEmp_status ?? '');
//
//     debugPrint('Pre Session initialized: $decoded');
//   }
//
//   /// Restore session from tokens
//   Future<void> restoreSession() async {
//     prefs = await SharedPreferences.getInstance();
//
//     final postToken = await TokenService.getPostToken();
//     final preToken = await TokenService.getPreToken();
//
//     if (postToken != null && postToken.isNotEmpty) {
//       Map<String, dynamic> decoded = Jwt.parseJwt(postToken);
//       mobileNo = decoded['mobile'];
//       empClientBranchId = decoded['client_branch_id'];
//       empCodeString = decoded['emp_code']?.toString();
//       gpaEmpName = decoded['name']?.toString();
//       empPrimaryId = decoded['id']?.toString();
//       client_id = decoded['client_id']?.toString();
//       emp_status = decoded['emp_status']?.toString();
//     }
//
//     if (preToken != null && preToken.isNotEmpty) {
//       Map<String, dynamic> decoded = Jwt.parseJwt(preToken);
//       enrollmentEmpClientBranchId = decoded['client_branch_id'];
//       enrollmentEmpCodeString = decoded['emp_code']?.toString();
//       enrollmentEmpPrimaryId = decoded['id']?.toString();
//       enrollmentGpaEmpName = decoded['name']?.toString();
//       enrollmentClient_id = decoded['client_id']?.toString();
//       enrollmentEmp_status = decoded['emp_status']?.toString();
//     }
//
//     sessionReady = (postToken?.isNotEmpty ?? false) || (preToken?.isNotEmpty ?? false);
//     _sessionController.add(null); // notify GoRouter
//   }
//
//   bool hasValidTokenSync() => sessionReady;
//
//   Future<void> clear() async {
//     mobileNo = null;
//     empClientBranchId = null;
//     empCodeString = null;
//     gpaEmpName = null;
//     empPrimaryId = null;
//     client_id = null;
//     emp_status = null;
//
//     enrollmentEmpClientBranchId = null;
//     enrollmentEmpCodeString = null;
//     enrollmentEmpPrimaryId = null;
//     enrollmentGpaEmpName = null;
//     enrollmentClient_id = null;
//     enrollmentEmp_status = null;
//
//     await prefs?.clear();
//     await TokenService.clearTokens();
//     sessionReady = false;
//     _sessionController.add(null);
//   }
//
// }

import 'package:flutter/foundation.dart';
import 'package:jwt_decode/jwt_decode.dart';
import 'package:nhance_app_pwa/logger.dart';
import 'package:nhance_app_pwa/pages/service/data_manager.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'TokenService.dart';

class SessionManager {
  static final SessionManager _instance = SessionManager._internal();
  factory SessionManager() => _instance;
  SessionManager._internal();

  bool isReady = false;

  /// Mobile only: false after a full app restart until login / MPIN succeeds.
  /// Stays true while the process stays alive (e.g. user only minimized the app).
  /// Web always behaves as unlocked ([isMobileAppSessionUnlocked] is true).
  bool _mobileAppSessionUnlocked = false;

  bool get isMobileAppSessionUnlocked =>
      kIsWeb ? true : _mobileAppSessionUnlocked;

  void unlockMobileAppSession() {
    if (!kIsWeb) _mobileAppSessionUnlocked = true;
  }

  void lockMobileAppSession() {
    if (!kIsWeb) _mobileAppSessionUnlocked = false;
  }

  // ===== Post Enrollment Fields =====
  String? mobileNo;
  String? empClientBranchId;
  String? empCodeString;
  String? gpaEmpName;
  String? empPrimaryId;
  String? client_id;
  String? emp_status;
  String? empEmailCorporate;

  // ===== Pre Enrollment Fields =====
  String? enrollmentEmpClientBranchId;
  String? enrollmentEmpCodeString;
  String? enrollmentEmpPrimaryId;
  String? enrollmentGpaEmpName;
  String? enrollmentClient_id;
  String? enrollmentEmp_status;
  String? enrollmentEmailCorporate;

  /// Save Post Enrollment Token
  Future<void> initializeFromPostToken(String token) async {
    Map<String, dynamic> decoded = Jwt.parseJwt(token);

    mobileNo = decoded['mobile'];
    empClientBranchId = decoded['client_branch_id'];
    empCodeString = decoded['emp_code']?.toString();
    gpaEmpName = decoded['name']?.toString();
    empPrimaryId = decoded['id']?.toString();
    client_id = decoded['client_id']?.toString();
    emp_status = decoded['emp_status']?.toString();
    empEmailCorporate = decoded['email_corporate']?.toString();

    // Web: keep session in memory + JWT in sessionStorage only (no SharedPreferences).
    if (!kIsWeb) {
      final prefs = await SharedPreferences.getInstance();
      prefs.setString('mobileNo', mobileNo ?? '');
      prefs.setString('empCodeString', empCodeString ?? '');
      prefs.setString('gpaEmpName', gpaEmpName ?? '');
      prefs.setString('empPrimaryId', empPrimaryId ?? '');
      prefs.setString('client_id', client_id ?? '');
      prefs.setString('empClientBranchId', empClientBranchId ?? '');
      prefs.setString('emp_status', emp_status ?? '');
      prefs.setString('empEmailCorporate', empEmailCorporate ?? '');
    }

    logDebug('Post Session initialized: $decoded');
  }

  /// Save Pre Enrollment Token
  Future<void> initializeFromPreToken(String token) async {
    Map<String, dynamic> decoded = Jwt.parseJwt(token);

    enrollmentEmpClientBranchId = decoded['client_branch_id'];
    enrollmentEmpCodeString = decoded['emp_code']?.toString();
    enrollmentEmpPrimaryId = decoded['id']?.toString();
    enrollmentGpaEmpName = decoded['name']?.toString();
    enrollmentClient_id = decoded['client_id']?.toString();
    enrollmentEmp_status = decoded['emp_status']?.toString();
    enrollmentEmailCorporate = decoded['email_corporate']?.toString();

    if (!kIsWeb) {
      final prefs = await SharedPreferences.getInstance();
      prefs.setString(
          'enrollmentEmpClientBranchId', enrollmentEmpClientBranchId ?? '');
      prefs.setString(
          'enrollmentEmpCodeString', enrollmentEmpCodeString ?? '');
      prefs.setString(
          'enrollmentEmpPrimaryId', enrollmentEmpPrimaryId ?? '');
      prefs.setString('enrollmentGpaEmpName', enrollmentGpaEmpName ?? '');
      prefs.setString('enrollmentClient_id', enrollmentClient_id ?? '');
      prefs.setString('enrollmentEmp_status', enrollmentEmp_status ?? '');
      prefs.setString(
          'enrollmentEmailCorporate', enrollmentEmailCorporate ?? '');
    }

    logDebug('Pre Session initialized: $decoded');
  }

  /// Restore session at startup
  Future<void> restoreSession() async {
    final postToken = await TokenService.getPostToken();
    final preToken = await TokenService.getPreToken();

    if (postToken != null && postToken.isNotEmpty) {
      await initializeFromPostToken(postToken);
    }

    if (preToken != null && preToken.isNotEmpty) {
      await initializeFromPreToken(preToken);
    }


    // 🔴 If both tokens are null/empty → clear session
    if ((postToken == null || postToken.isEmpty) &&
        (preToken == null || preToken.isEmpty)) {
      await clear();
    }
  }


  /// Clear all session values
  Future<void> clear() async {
    mobileNo = null;
    empClientBranchId = null;
    empCodeString = null;
    gpaEmpName = null;
    empPrimaryId = null;
    client_id = null;
    emp_status = null;
    empEmailCorporate = null;

    enrollmentEmpClientBranchId = null;
    enrollmentEmpCodeString = null;
    enrollmentEmpPrimaryId = null;
    enrollmentGpaEmpName = null;
    enrollmentClient_id = null;
    enrollmentEmp_status = null;
    enrollmentEmailCorporate = null;

    final prefs = await SharedPreferences.getInstance();
    await prefs.clear();
    await DataManager().clearData();
    await TokenService.clearTokens();
    lockMobileAppSession();
  }
}