Vendor Authentication Flow

class ErrorHandler {
  handleAuthError(error: AuthError): void {
    switch (error.code) {
      case 'AUTH_TIMEOUT':
        this.ui.showMessage('Authentication timed out. Please try again.');
        this.offerRetry();
        break;

      case 'NO_MATCH':
        this.ui.showMessage('Palm not recognized. Please ensure you are using your registered palm.');
        this.logFailedAttempt();
        break;

      case 'PALM_NOT_REGISTERED':
        this.ui.showMessage('This palm is not registered. Would you like to register now?');
        this.offerRegistration();
        break;

      case 'INSUFFICIENT_QUALITY':
        this.ui.showMessage('Unable to read palm clearly. Please clean the scanner and try again.');
        this.checkScannerStatus();
        break;

      case 'CONSENT_REQUIRED':
        this.ui.showMessage('Additional permissions needed. Please grant access to continue.');
        this.requestConsent(error.details.attributes);
        break;

      default:
        this.ui.showMessage('Authentication failed. Please try another method.');
        this.offerFallback();
    }
  }
}

class BatchAuthProcessor {
  async processBatch(requests: AuthRequest[]): Promise<AuthResult[]> {
    const contexts = requests.map(req => ({
      type: 'create_auth_context',
      context_id: crypto.randomUUID(),
      auth_type: req.type,
      requirements: req.requirements,
      batch_id: this.currentBatchId
    }));

    // Send all contexts
    await Promise.all(contexts.map(ctx => this.send(ctx)));

    // Collect results
    return Promise.all(
      contexts.map(ctx => this.waitForResult(ctx.context_id))
    );
  }
}

interface RiskFactors {
  time_since_last_auth: number;
  location_change: boolean;
  amount_unusual: boolean;
  device_trusted: boolean;
}

function calculateRiskScore(factors: RiskFactors): number {
  let score = 0;

  if (factors.time_since_last_auth > 86400000) score += 10;  // >1 day
  if (factors.location_change) score += 20;
  if (factors.amount_unusual) score += 30;
  if (!factors.device_trusted) score += 15;

  return score;
}

async function riskBasedAuth(request: AuthRequest): Promise<void> {
  const risk = calculateRiskScore(request.riskFactors);

  if (risk < 20) {
    // Low risk - standard auth
    await standardAuth(request);
  } else if (risk < 50) {
    // Medium risk - require additional verification
    await enhancedAuth(request, ['email', 'phone']);
  } else {
    // High risk - multi-factor required
    await multiFactorAuth(request);
  }
}

class AuthSession {
  private sessions: Map<string, SessionData> = new Map();

  createSession(userId: string, attributes: any): string {
    const sessionId = crypto.randomUUID();

    this.sessions.set(sessionId, {
      userId,
      attributes,
      createdAt: Date.now(),
      lastActivity: Date.now(),
      authCount: 0
    });

    // Expire after 1 hour of inactivity
    setTimeout(() => {
      this.expireSession(sessionId);
    }, 3600000);

    return sessionId;
  }

  async reauthenticate(sessionId: string): Promise<boolean> {
    const session = this.sessions.get(sessionId);
    if (!session) return false;

    // Check if re-auth needed
    const timeSinceAuth = Date.now() - session.lastActivity;
    if (timeSinceAuth > 600000) {  // 10 minutes
      // Quick re-auth (palm only, no attributes)
      const result = await this.quickAuth(session.userId);
      if (result.success) {
        session.lastActivity = Date.now();
        session.authCount++;
        return true;
      }
    }

    return false;
  }
}

class ConnectionPool {
  private connections: WebSocket[] = [];
  private maxConnections = 5;
  private currentIndex = 0;

  async initialize() {
    for (let i = 0; i < this.maxConnections; i++) {
      const ws = await this.createConnection();
      this.connections.push(ws);
    }
  }

  getConnection(): WebSocket {
    const ws = this.connections[this.currentIndex];
    this.currentIndex = (this.currentIndex + 1) % this.maxConnections;
    return ws;
  }
}

class AttributeCache {
  private cache: Map<string, CachedAttributes> = new Map();

  set(userId: string, attributes: any, ttl: number = 300000) {
    this.cache.set(userId, {
      data: attributes,
      expiry: Date.now() + ttl
    });
  }

  get(userId: string): any | null {
    const cached = this.cache.get(userId);

    if (cached && cached.expiry > Date.now()) {
      return cached.data;
    }

    this.cache.delete(userId);
    return null;
  }
}

describe('VendorAuthentication', () => {
  let client: VendorAuthClient;
  let mockWs: MockWebSocket;

  beforeEach(() => {
    mockWs = new MockWebSocket();
    client = new VendorAuthClient(mockWs);
  });

  test('successful payment authentication', async () => {
    const result = await client.processPayment(1000);

    expect(result.success).toBe(true);
    expect(result.user_id).toBeDefined();
    expect(result.attributes.email).toBeDefined();
  });

  test('handles timeout correctly', async () => {
    mockWs.simulateTimeout();

    await expect(client.processPayment(1000))
      .rejects.toThrow('Authentication timeout');
  });

  test('retries on connection loss', async () => {
    mockWs.simulateDisconnect();

    await wait(100);
    expect(mockWs.reconnectAttempts).toBe(1);
  });
});