Function Calling Evolution: Platform-Managed vs Provider-Native

1. User Request: "What's the status of order #12345?"
2. AI Analysis: Determines an order status function is needed
3. Parameter Extraction: Extracts order_id = "12345"
4. Function Execution: Calls orderStatus(order_id: "12345")
5. Result Integration: "Order #12345 is shipped and arriving tomorrow"

// Function definition
const functions = [
  {
    name: 'getOrderStatus',
    description: 'Get the current status of a customer order',
    parameters: {
      type: 'object',
      properties: {
        order_id: {
          type: 'string',
          description: 'The order ID to check',
        },
      },
      required: ['order_id'],
    },
  },
]

// AI determines to call: getOrderStatus(order_id: "12345")
// Function returns: { status: "shipped", tracking: "1Z999AA1234567890", eta: "tomorrow" }
// AI integrates result: "Your order is shipped with tracking number 1Z999AA1234567890..."

// Define functions in OpenAI Assistant
const assistant = await openai.beta.assistants.create({
  model: 'gpt-4',
  tools: [
    {
      type: 'function',
      function: {
        name: 'get_order_status',
        description: 'Retrieve current order status',
        parameters: {
          type: 'object',
          properties: {
            order_id: { type: 'string' },
          },
        },
      },
    },
  ],
})

// OpenAI handles function calling internally
// You provide the function implementation via webhook

const limitations = {
  'black-box-execution': 'Limited visibility into function call decision-making',
  'fixed-authentication': 'Restricted to OpenAI-supported auth methods',
  'vendor-lock-in': 'Functions tied to OpenAI Assistant architecture',
  'limited-customization': 'Cannot modify function calling behavior',
  'cost-unpredictability': 'Function calls add to token usage unpredictably',
}

// Define functions with complete control
const businessFunctions = {
  orderStatus: {
    name: 'getOrderStatus',
    description: 'Get real-time order status from our systems',
    endpoint: 'https://api.yourcompany.com/orders/{order_id}/status',
    authentication: {
      type: 'bearer',
      token: 'your-secure-api-token',
    },
    parameters: {
      order_id: { type: 'string', required: true, pattern: '^ORD-\\d{6}$' },
    },
    responseMapping: {
      status: 'order.current_status',
      tracking: 'shipping.tracking_number',
      eta: 'shipping.estimated_delivery',
    },
    errorHandling: {
      404: 'Order not found. Please check the order number.',
      403: 'Unable to access order details. Please contact support.',
      500: 'System temporarily unavailable. Please try again later.',
    },
  },
}

const aiResource = {
  type: 'openai-responses',
  functions: businessFunctions,
  functionCallStrategy: 'intelligent-routing',
}

const securityAdvantages = {
  'custom-authentication': 'OAuth, JWT, API keys, custom auth methods',
  'audit-logging': 'Complete log of all function calls and responses',
  'access-control': 'Role-based permissions for function execution',
  'data-residency': 'Functions execute in your controlled environment',
  compliance: 'Meet industry-specific regulatory requirements',
}

const flexibilityAdvantages = {
  'custom-error-handling': 'Define specific error responses for business context',
  'response-transformation': 'Format function results for optimal AI integration',
  'rate-limiting': 'Control function call frequency and costs',
  'conditional-logic': 'Execute functions based on user context or permissions',
  'multi-provider': 'Same functions work with different AI providers',
}

const integrationAdvantages = {
  'existing-apis': 'Direct integration with current business systems',
  'custom-workflows': 'Multi-step business processes with approval chains',
  'real-time-data': 'Live integration with databases and services',
  'legacy-systems': 'Connect AI to older systems via custom adapters',
}

const ecommerceFunctions = {
  // Product catalog
  productSearch: {
    name: 'searchProducts',
    endpoint: '/api/products/search',
    parameters: { query: 'string', category: 'string', price_range: 'object' },
    authentication: 'internal-api-key',
  },

  // Inventory management
  inventoryCheck: {
    name: 'checkInventory',
    endpoint: '/api/inventory/{product_id}',
    parameters: { product_id: 'string' },
    realTimeData: true,
  },

  // Order processing
  createOrder: {
    name: 'createOrder',
    endpoint: '/api/orders/create',
    parameters: { items: 'array', customer_info: 'object' },
    authentication: 'oauth2',
    approvalRequired: true,
  },

  // Customer service
  orderStatus: {
    name: 'getOrderStatus',
    endpoint: '/api/orders/{order_id}/status',
    parameters: { order_id: 'string' },
    errorHandling: {
      404: "I couldn't find an order with that number. Could you double-check it?",
      403: "I don't have permission to access that order. Please contact support.",
    },
  },
}

const supportFunctions = {
  // Ticket management
  createTicket: {
    name: 'createSupportTicket',
    endpoint: '/api/support/tickets/create',
    parameters: {
      title: 'string',
      description: 'string',
      priority: 'enum[low,medium,high,urgent]',
      customer_id: 'string',
    },
    postProcessing: 'send-confirmation-email',
  },

  // Knowledge base
  searchKnowledgeBase: {
    name: 'searchKB',
    endpoint: '/api/kb/search',
    parameters: { query: 'string', category: 'string' },
    responseTransform: 'extract-solution-steps',
  },

  // Account management
  updateAccount: {
    name: 'updateAccountInfo',
    endpoint: '/api/accounts/{customer_id}/update',
    parameters: { customer_id: 'string', updates: 'object' },
    authentication: 'customer-token',
    auditLog: true,
  },
}

const businessProcessFunctions = {
  // Lead qualification
  qualifyLead: {
    name: 'qualifyLead',
    workflow: [
      { step: 'validate-contact-info', endpoint: '/api/leads/validate' },
      { step: 'score-lead', endpoint: '/api/leads/score' },
      { step: 'assign-to-sales', endpoint: '/api/crm/assign' },
    ],
    conditionalLogic: 'route-based-on-score',
  },

  // Appointment scheduling
  scheduleAppointment: {
    name: 'scheduleAppointment',
    endpoint: '/api/calendar/schedule',
    parameters: {
      preferred_date: 'date',
      preferred_time: 'time',
      service_type: 'string',
      customer_info: 'object',
    },
    integrations: ['google-calendar', 'salesforce', 'email-notifications'],
  },
}

const migrationAssessment = {
  currentFunctions: [
    'identify-all-openai-assistant-functions',
    'document-current-workflows',
    'map-authentication-requirements',
    'catalog-error-scenarios',
  ],

  businessRequirements: [
    'security-and-compliance-needs',
    'integration-with-existing-systems',
    'custom-error-handling-requirements',
    'multi-provider-strategy-goals',
  ],

  technicalGaps: [
    'authentication-method-limitations',
    'audit-logging-insufficiency',
    'error-handling-inadequacy',
    'vendor-lock-in-risks',
  ],
}

const parallelMigration = {
  phase1: {
    scope: 'non-critical-functions',
    approach: 'implement-platform-managed-versions',
    testing: 'side-by-side-comparison',
    duration: '2-3 weeks',
  },

  phase2: {
    scope: 'business-critical-functions',
    approach: 'enhanced-platform-managed-with-additional-controls',
    testing: 'comprehensive-business-scenario-testing',
    duration: '3-4 weeks',
  },

  phase3: {
    scope: 'complete-migration',
    approach: 'switch-all-traffic-to-platform-managed',
    monitoring: 'continuous-performance-and-error-monitoring',
    rollback: 'immediate-revert-capability',
  },
}

const migrationEnhancements = {
  // Better error handling
  errorHandling: {
    before: 'Generic OpenAI Assistant error responses',
    after: 'Business-specific error messages with resolution steps',
  },

  // Enhanced security
  security: {
    before: 'Limited to OpenAI authentication options',
    after: 'Custom OAuth, JWT, role-based access control',
  },

  // Improved monitoring
  monitoring: {
    before: 'Limited visibility into function execution',
    after: 'Complete audit logs, performance metrics, business analytics',
  },

  // Cost optimization
  costControl: {
    before: 'Unpredictable token usage from function calls',
    after: 'Predictable costs with detailed usage tracking',
  },
}

const complexOrderWorkflow = {
  name: 'processComplexOrder',
  steps: [
    {
      function: 'validateCustomer',
      parameters: ['customer_id'],
      errorHandling: 'return-validation-requirements',
    },
    {
      function: 'checkInventoryAvailability',
      parameters: ['items'],
      conditionalLogic: 'if-unavailable-suggest-alternatives',
    },
    {
      function: 'calculatePricing',
      parameters: ['items', 'customer_tier', 'promotions'],
      transformation: 'format-for-customer-display',
    },
    {
      function: 'processPayment',
      parameters: ['payment_info', 'total_amount'],
      security: 'pci-compliant-processing',
      fallback: 'offer-alternative-payment-methods',
    },
    {
      function: 'createShipment',
      parameters: ['order_details', 'shipping_address'],
      integration: 'warehouse-management-system',
    },
    {
      function: 'sendConfirmation',
      parameters: ['customer_email', 'order_summary'],
      channels: ['email', 'sms', 'in-app-notification'],
    },
  ],
}

const conditionalExecution = {
  // Customer service functions based on agent level
  customerServiceFunctions: {
    'level-1-agent': ['view-order-status', 'update-address', 'process-return'],
    'level-2-agent': ['issue-refund', 'escalate-to-manager', 'modify-order'],
    supervisor: ['override-policy', 'bulk-operations', 'system-admin'],
  },

  // Customer functions based on account type
  customerFunctions: {
    'basic-customer': ['view-orders', 'track-shipments', 'basic-support'],
    'premium-customer': ['priority-support', 'advanced-analytics', 'account-manager'],
    'enterprise-customer': ['custom-integrations', 'dedicated-support', 'bulk-operations'],
  },
}

const functionOptimization = {
  caching: {
    'product-catalog': { ttl: 3600, invalidation: 'product-update-events' },
    'inventory-levels': { ttl: 300, invalidation: 'stock-change-events' },
    'pricing-info': { ttl: 1800, invalidation: 'price-update-events' },
  },

  batching: {
    'inventory-checks': 'batch-multiple-products-single-api-call',
    'price-lookups': 'bulk-pricing-with-quantity-discounts',
    'customer-data': 'fetch-complete-customer-profile-once',
  },

  prioritization: {
    'critical-functions': ['payment-processing', 'security-validation'],
    'standard-functions': ['product-search', 'order-status'],
    'low-priority': ['analytics-tracking', 'recommendation-updates'],
  },
}

const securityFramework = {
  authentication: {
    'api-gateway': 'centralized-authentication-and-rate-limiting',
    'service-level': 'individual-service-authentication',
    'user-context': 'maintain-user-identity-through-function-calls',
  },

  authorization: {
    'role-based': 'functions-available-based-on-user-role',
    'context-aware': 'permissions-based-on-current-conversation-context',
    dynamic: 'real-time-permission-evaluation',
  },

  auditLogging: {
    'function-calls': 'log-all-function-invocations-with-parameters',
    results: 'log-function-results-and-ai-integration',
    errors: 'detailed-error-logging-for-debugging-and-compliance',
    'user-actions': 'maintain-audit-trail-for-user-interactions',
  },
}

const complianceFramework = {
  // Healthcare (HIPAA)
  healthcare: {
    'data-encryption': 'encrypt-all-phi-in-transit-and-at-rest',
    'access-controls': 'strict-role-based-access-to-patient-data',
    'audit-trails': 'comprehensive-logging-for-hipaa-compliance',
    'consent-management': 'verify-patient-consent-before-data-access',
  },

  // Financial (PCI-DSS, SOX)
  financial: {
    'payment-security': 'pci-compliant-payment-processing',
    'transaction-logging': 'immutable-transaction-audit-trails',
    'fraud-detection': 'real-time-fraud-analysis-on-function-calls',
    'regulatory-reporting': 'automated-compliance-reporting',
  },

  // General (GDPR)
  privacy: {
    'data-minimization': 'only-request-necessary-data-for-functions',
    'consent-tracking': 'maintain-consent-records-for-data-processing',
    'right-to-deletion': 'support-data-deletion-requests',
    'data-portability': 'enable-data-export-functions',
  },
}

const futureCapabilities = {
  // AI-generated functions
  dynamicFunctions: {
    description: 'AI creates custom functions based on business descriptions',
    example: 'Generate payment processing function from business rules',
    timeline: '2025-2026',
  },

  // Cross-provider function orchestration
  multiProviderWorkflows: {
    description: 'Functions that work across different AI providers seamlessly',
    example: 'OpenAI starts workflow, Anthropic handles analysis, XAI provides real-time data',
    timeline: '2025',
  },

  // Autonomous business process execution
  autonomousProcesses: {
    description: 'AI manages complete business processes with minimal human oversight',
    example: 'End-to-end order fulfillment from customer inquiry to delivery',
    timeline: '2026-2027',
  },
}

const platformEvolution = {
  // Visual function builder
  noCodeFunctions: {
    description: 'Build complex business functions without coding',
    features: ['drag-drop-workflow-builder', 'automatic-api-integration', 'visual-error-handling'],
    target: 'business-users-and-citizen-developers',
  },

  // AI-powered function optimization
  intelligentOptimization: {
    description: 'AI optimizes function performance and cost automatically',
    features: ['automatic-caching-strategies', 'cost-optimization', 'performance-tuning'],
    impact: 'reduced-operational-overhead',
  },

  // Function marketplace
  functionEcosystem: {
    description: 'Shared marketplace of business functions',
    features: ['pre-built-industry-functions', 'community-contributions', 'certified-integrations'],
    benefit: 'faster-deployment-and-proven-reliability',
  },
}

const implementationPriority = {
  phase1: 'customer-service-functions', // High impact, manageable complexity
  phase2: 'business-process-automation', // Higher complexity, significant value
  phase3: 'advanced-workflows', // Complex but competitive advantage
  phase4: 'ai-powered-optimization', // Future competitive differentiation
}