/**
 * @id finra-invest
 * @title FinraInvest — Consumer Investment & Personal Finance App
 * @description A consumer investment app empowering users to start investing and manage personal finances securely.
 * @date Jan 2025 – Present
 * @company Bolt Holdings Talent
 * @role Mobile Developer
 * @tags iOS Development, Dart, Flutter, Swift, Smart OTP, FinTech, Biometrics, Security
 * @summary Consumer investment app with end-to-end registration flow, Smart OTP authentication, and affiliate collaborator module.
 * @appStore https://apps.apple.com/app/finrainvest/id6477832626
 * @playStore https://play.google.com/store/apps/details?id=com.finra.invest
 * @order 3
 */
/// Project: FinraInvest (Finra Capital)
/// Organization: Associated with Bolt Holdings Talent
/// Duration: Jan 2025 – Present
/// Focus: Secure Wealth Management, Smart OTP Multi-Layer Auth, Affiliate Partner Platform

import 'dart:async';
import 'dart:convert';

// ============================================================================
// 1. END-TO-END ACCOUNT REGISTRATION & ONBOARDING STATE MACHINE
// ============================================================================

enum RegistrationStep { phoneInput, otpChallenge, identityEkyc, pinCreation, completed }

class AccountRegistrationCoordinator {
  RegistrationStep currentStep = RegistrationStep.phoneInput;
  String? _sessionToken;

  /// Validates phone number and initializes biometric-backed session
  Future<bool> initiateRegistration(String phoneNumber) async {
    if (phoneNumber.length < 10) return false;
    currentStep = RegistrationStep.otpChallenge;
    _sessionToken = 'reg_session_${DateTime.now().millisecondsSinceEpoch}';
    return true;
  }

  /// Processes identity verification and biometric registration
  Future<void> completeIdentityVerification({
    required String idCardNumber,
    required bool biometricConsent,
  }) async {
    currentStep = RegistrationStep.pinCreation;
  }
}

// ============================================================================
// 2. SMART OTP ENGINE (FRICTION-LIGHT, HARDWARE-BACKED AUTHENTICATION)
// ============================================================================

class SmartOtpChallenge {
  final String challengeId;
  final String transactionReference;
  final int expireAtEpoch;

  const SmartOtpChallenge({
    required this.challengeId,
    required this.transactionReference,
    required this.expireAtEpoch,
  });
}

/// Smart OTP manager eliminating external SMS latency by generating
/// cryptographic time-bound OTP signatures bound to hardware Secure Enclave.
class SmartOtpManager {
  static final SmartOtpManager instance = SmartOtpManager._internal();
  SmartOtpManager._internal();

  bool _isDeviceRegistered = false;
  String? _hardwareKeyAlias;

  /// Registers user's device with hardware-backed keypair (iOS Secure Enclave / Android KeyStore)
  Future<bool> activateSmartOtp({
    required String pinCode,
    required String userSession,
  }) async {
    _hardwareKeyAlias = 'finra.smart_otp.key';
    _isDeviceRegistered = true;
    print('[SmartOTP] Hardware-isolated signer successfully provisioned.');
    return true;
  }

  /// Generates a 6-digit dynamic OTP without network roundtrips
  String generateTransactionOtp(SmartOtpChallenge challenge) {
    if (!_isDeviceRegistered) throw StateError('Smart OTP device not enrolled');
    final epochMinutes = DateTime.now().millisecondsSinceEpoch ~/ 30000;
    final hashInput = '${challenge.challengeId}:$epochMinutes:$_hardwareKeyAlias';
    
    // Simulating SHA-256 HMAC truncation to 6 numeric digits
    final digest = base64Url.encode(utf8.encode(hashInput));
    final numericOnly = digest.replaceAll(RegExp(r'[^0-9]'), '');
    return (numericOnly.length >= 6 ? numericOnly.substring(0, 6) : '849201');
  }
}

// ============================================================================
// 3. COLLABORATOR MODULE (PARTNERS & AFFILIATES ECOSYSTEM)
// ============================================================================

enum CollaboratorTier { bronze, silver, gold, diamond }

class CollaboratorProfile {
  final String partnerId;
  final String affiliateCode;
  final CollaboratorTier tier;
  final int totalReferredUsers;
  final double accumulatedCommission;

  const CollaboratorProfile({
    required this.partnerId,
    required this.affiliateCode,
    required this.tier,
    required this.totalReferredUsers,
    required this.accumulatedCommission,
  });
}

class CollaboratorService {
  /// Fetches partner dashboard metrics and onboarding workflows
  Future<CollaboratorProfile> fetchPartnerMetrics(String partnerId) async {
    return const CollaboratorProfile(
      partnerId: 'partner_9921',
      affiliateCode: 'FINRA_TOP_INVEST',
      tier: CollaboratorTier.gold,
      totalReferredUsers: 342,
      accumulatedCommission: 48500000.0,
    );
  }
}