@clduab11/gemini-flow/src/services/google-services/infrastructure/media-cache-manager.ts

Revolutionary AI agent swarm coordination platform with Google Services integration, multimedia processing, and production-ready monitoring. Features 8 Google AI services, quantum computing capabilities, and enterprise-grade security.

/**
 * Media Cache Manager with CDN Integration
 *
 * Advanced media caching system with intelligent cache management,
 * multi-tier caching, and global CDN integration.
 */

import { EventEmitter } from "events";
import { Logger } from "../../../utils/logger.js";
import {
  MediaCacheConfig,
  ServiceResponse,
  ServiceError,
  PerformanceMetrics,
} from "../interfaces.js";

export interface CacheNode {
  id: string;
  type: "edge" | "regional" | "origin" | "memory" | "disk";
  location: NodeLocation;
  capacity: CacheCapacity;
  utilization: CacheUtilization;
  performance: CachePerformance;
  health: NodeHealth;
  configuration: NodeConfiguration;
}

export interface NodeLocation {
  region: string;
  zone?: string;
  city?: string;
  country: string;
  coordinates: Coordinates;
  provider: string;
}

export interface Coordinates {
  latitude: number;
  longitude: number;
}

export interface CacheCapacity {
  storage: number; // bytes
  bandwidth: number; // bytes/sec
  connections: number;
  requests: number; // per second
}

export interface CacheUtilization {
  storage: number; // percentage
  bandwidth: number; // percentage
  connections: number; // percentage
  requests: number; // percentage
  efficiency: number; // 0-100
}

export interface CachePerformance {
  hitRate: number; // percentage
  missRate: number; // percentage
  latency: LatencyMetrics;
  throughput: ThroughputMetrics;
  errors: ErrorMetrics;
}

export interface LatencyMetrics {
  mean: number;
  p50: number;
  p95: number;
  p99: number;
  max: number;
}

export interface ThroughputMetrics {
  current: number;
  peak: number;
  average: number;
}

export interface ErrorMetrics {
  rate: number;
  types: Record<string, number>;
  recent: ErrorEvent[];
}

export interface ErrorEvent {
  timestamp: Date;
  type: string;
  message: string;
  severity: "low" | "medium" | "high" | "critical";
}

export interface NodeHealth {
  status: "healthy" | "degraded" | "unhealthy" | "offline";
  score: number; // 0-100
  issues: HealthIssue[];
  lastCheck: Date;
  uptime: number; // seconds
}

export interface HealthIssue {
  type: "performance" | "capacity" | "connectivity" | "error";
  severity: "low" | "medium" | "high" | "critical";
  description: string;
  timestamp: Date;
  resolved: boolean;
}

export interface NodeConfiguration {
  tier: number; // 1 = highest priority
  weight: number;
  policies: CachePolicy[];
  rules: CacheRule[];
  limits: CacheLimits;
}

export interface CachePolicy {
  name: string;
  type: "eviction" | "compression" | "encryption" | "replication";
  enabled: boolean;
  parameters: PolicyParameters;
}

export interface PolicyParameters {
  [key: string]: any;
}

export interface CacheRule {
  pattern: string;
  action: "cache" | "bypass" | "redirect" | "block";
  ttl?: number;
  conditions: RuleCondition[];
}

export interface RuleCondition {
  field: string;
  operator: "==" | "!=" | ">" | "<" | ">=" | "<=" | "contains" | "matches";
  value: any;
}

export interface CacheLimits {
  maxFileSize: number; // bytes
  maxRequestRate: number; // per second
  maxBandwidth: number; // bytes/sec
  maxConnections: number;
}

export interface CacheEntry {
  key: string;
  content: CacheContent;
  metadata: EntryMetadata;
  stats: EntryStats;
  locations: CacheLocation[];
}

export interface CacheContent {
  data?: Buffer;
  url?: string;
  headers: Record<string, string>;
  contentType: string;
  size: number;
  etag: string;
  compressed: boolean;
  encrypted: boolean;
}

export interface EntryMetadata {
  created: Date;
  expires: Date;
  lastAccessed: Date;
  lastModified: Date;
  ttl: number; // seconds
  priority: number;
  tags: string[];
  source: string;
}

export interface EntryStats {
  hits: number;
  misses: number;
  bytes: number;
  requests: RequestStats[];
  geographic: GeographicStats[];
}

export interface RequestStats {
  timestamp: Date;
  node: string;
  latency: number;
  size: number;
  status: number;
}

export interface GeographicStats {
  region: string;
  hits: number;
  bytes: number;
  latency: number;
}

export interface CacheLocation {
  nodeId: string;
  stored: Date;
  size: number;
  compressed: boolean;
  replicated: boolean;
}

export interface CacheRequest {
  key: string;
  method: "GET" | "PUT" | "DELETE" | "HEAD";
  headers?: Record<string, string>;
  metadata?: CacheRequestMetadata;
  options?: CacheOptions;
}

export interface CacheRequestMetadata {
  clientIp?: string;
  userAgent?: string;
  referer?: string;
  priority?: number;
  tags?: string[];
}

export interface CacheOptions {
  ttl?: number;
  compression?: boolean;
  encryption?: boolean;
  replication?: boolean;
  bypass?: boolean;
  refresh?: boolean;
}

export interface CacheResponse {
  hit: boolean;
  content?: CacheContent;
  source: string; // node ID or 'origin'
  latency: number;
  metadata: ResponseMetadata;
}

export interface ResponseMetadata {
  cached: Date;
  expires: Date;
  age: number; // seconds
  fresh: boolean;
  etag: string;
}

export interface CacheInvalidation {
  patterns: string[];
  tags: string[];
  recursive: boolean;
  immediate: boolean;
  propagate: boolean;
}

export interface CacheStatistics {
  global: GlobalStats;
  nodes: NodeStats[];
  content: ContentStats[];
  geographic: GeographicDistribution[];
}

export interface GlobalStats {
  totalEntries: number;
  totalSize: number;
  hitRate: number;
  missRate: number;
  bandwidth: BandwidthStats;
  requests: RequestStatistics;
}

export interface BandwidthStats {
  ingress: number;
  egress: number;
  saved: number; // bytes saved by caching
}

export interface RequestStatistics {
  total: number;
  perSecond: number;
  peak: number;
  average: number;
}

export interface NodeStats {
  nodeId: string;
  entries: number;
  size: number;
  hitRate: number;
  utilization: CacheUtilization;
  performance: CachePerformance;
}

export interface ContentStats {
  type: string;
  entries: number;
  size: number;
  hits: number;
  bandwidth: number;
}

export interface GeographicDistribution {
  region: string;
  requests: number;
  bytes: number;
  latency: number;
  hitRate: number;
}

export interface CDNConfiguration {
  providers: CDNProvider[];
  routing: RoutingConfiguration;
  security: SecurityConfiguration;
  monitoring: MonitoringConfiguration;
}

export interface CDNProvider {
  name: string;
  enabled: boolean;
  weight: number;
  endpoints: ProviderEndpoint[];
  capabilities: ProviderCapability[];
  pricing: PricingModel;
}

export interface ProviderEndpoint {
  region: string;
  url: string;
  priority: number;
  healthCheck: HealthCheckConfig;
}

export interface HealthCheckConfig {
  enabled: boolean;
  interval: number; // seconds
  timeout: number; // seconds
  threshold: number; // failures before marking unhealthy
}

export interface ProviderCapability {
  name: string;
  supported: boolean;
  parameters?: any;
}

export interface PricingModel {
  bandwidth: PricingTier[];
  requests: PricingTier[];
  storage: PricingTier[];
}

export interface PricingTier {
  threshold: number;
  rate: number;
  unit: string;
}

export interface RoutingConfiguration {
  strategy: "performance" | "cost" | "geographic" | "balanced";
  failover: FailoverConfiguration;
  loadBalancing: LoadBalancingConfiguration;
}

export interface FailoverConfiguration {
  enabled: boolean;
  maxRetries: number;
  timeout: number; // seconds
  healthCheck: boolean;
}

export interface LoadBalancingConfiguration {
  algorithm: "round_robin" | "least_connections" | "weighted" | "geographic";
  weights: Record<string, number>;
  stickySession: boolean;
}

export interface SecurityConfiguration {
  authentication: AuthenticationConfig;
  authorization: AuthorizationConfig;
  encryption: EncryptionConfiguration;
  protection: ProtectionConfiguration;
}

export interface AuthenticationConfig {
  enabled: boolean;
  methods: AuthMethod[];
  tokenValidation: TokenValidationConfig;
}

export interface AuthMethod {
  type: "api_key" | "jwt" | "oauth" | "signature";
  enabled: boolean;
  configuration: any;
}

export interface TokenValidationConfig {
  endpoint?: string;
  cache: boolean;
  ttl: number; // seconds
}

export interface AuthorizationConfig {
  enabled: boolean;
  policies: AuthorizationPolicy[];
  defaultAction: "allow" | "deny";
}

export interface AuthorizationPolicy {
  name: string;
  rules: AuthorizationRule[];
  priority: number;
}

export interface AuthorizationRule {
  resource: string;
  action: string;
  principal: string;
  effect: "allow" | "deny";
  conditions?: any;
}

export interface EncryptionConfiguration {
  inTransit: boolean;
  atRest: boolean;
  algorithms: string[];
  keyManagement: KeyManagementConfig;
}

export interface KeyManagementConfig {
  provider: string;
  rotation: boolean;
  rotationInterval: number; // days
}

export interface ProtectionConfiguration {
  ddos: DDoSProtectionConfig;
  waf: WAFConfiguration;
  rateLimit: RateLimitConfig;
}

export interface DDoSProtectionConfig {
  enabled: boolean;
  threshold: number;
  mitigation: string[];
}

export interface WAFConfiguration {
  enabled: boolean;
  rules: WAFRule[];
  mode: "block" | "challenge" | "log";
}

export interface WAFRule {
  id: string;
  name: string;
  pattern: string;
  action: "block" | "challenge" | "allow";
  severity: string;
}

export interface RateLimitConfig {
  enabled: boolean;
  limits: RateLimit[];
  enforcement: "strict" | "soft";
}

export interface RateLimit {
  resource: string;
  limit: number;
  window: number; // seconds
  action: "block" | "throttle" | "queue";
}

export interface MonitoringConfiguration {
  metrics: MetricsConfiguration;
  alerts: AlertConfiguration;
  logging: LoggingConfiguration;
}

export interface MetricsConfiguration {
  enabled: boolean;
  collectors: MetricCollector[];
  retention: number; // days
}

export interface MetricCollector {
  name: string;
  type: string;
  interval: number; // seconds
  configuration: any;
}

export interface AlertConfiguration {
  enabled: boolean;
  rules: AlertRule[];
  channels: AlertChannel[];
}

export interface AlertRule {
  name: string;
  condition: string;
  threshold: number;
  severity: string;
  channels: string[];
}

export interface AlertChannel {
  name: string;
  type: string;
  configuration: any;
}

export interface LoggingConfiguration {
  enabled: boolean;
  level: "debug" | "info" | "warn" | "error";
  destinations: LogDestination[];
}

export interface LogDestination {
  type: string;
  configuration: any;
}

export class MediaCacheManager extends EventEmitter {
  private logger: Logger;
  private config: MediaCacheConfig;
  private nodes: Map<string, CacheNode> = new Map();
  private entries: Map<string, CacheEntry> = new Map();
  private cdnConfig: CDNConfiguration;
  private cacheEngine: CacheEngine;
  private distributionEngine: DistributionEngine;
  private invalidationEngine: InvalidationEngine;
  private analyticsEngine: AnalyticsEngine;
  private optimizationEngine: OptimizationEngine;
  private securityManager: CacheSecurityManager;

  constructor(config: MediaCacheConfig) {
    super();
    this.config = config;
    this.logger = new Logger("MediaCacheManager");

    this.initializeComponents();
    this.setupEventHandlers();
  }

  /**
   * Initializes the cache manager
   */
  async initialize(): Promise<void> {
    try {
      this.logger.info("Initializing Media Cache Manager");

      // Initialize cache nodes
      await this.initializeCacheNodes();

      // Initialize engines
      await this.cacheEngine.initialize();
      await this.distributionEngine.initialize();
      await this.invalidationEngine.initialize();
      await this.analyticsEngine.initialize();
      await this.optimizationEngine.initialize();
      await this.securityManager.initialize();

      // Start monitoring
      await this.startMonitoring();

      this.emit("initialized");
    } catch (error) {
      this.logger.error("Failed to initialize cache manager", error);
      throw error;
    }
  }

  /**
   * Gets cached content
   */
  async get(request: CacheRequest): Promise<ServiceResponse<CacheResponse>> {
    const startTime = Date.now();

    try {
      this.logger.debug("Cache get request", {
        key: request.key,
        method: request.method,
      });

      // Security validation
      await this.securityManager.validateRequest(request);

      // Find optimal cache node
      const node = await this.selectOptimalNode(request);

      // Get from cache
      const response = await this.cacheEngine.get(node, request);

      // Update statistics
      await this.analyticsEngine.recordAccess(request, response);

      this.emit("cache:access", { request, response, node: node.id });

      return {
        success: true,
        data: response,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: Date.now() - startTime,
          region: node.location.region,
        },
      };
    } catch (error) {
      this.logger.error("Cache get failed", { key: request.key, error });
      return this.createErrorResponse("CACHE_GET_FAILED", error.message);
    }
  }

  /**
   * Stores content in cache
   */
  async put(
    request: CacheRequest,
    content: CacheContent,
  ): Promise<ServiceResponse<void>> {
    try {
      this.logger.debug("Cache put request", {
        key: request.key,
        size: content.size,
        contentType: content.contentType,
      });

      // Security validation
      await this.securityManager.validateRequest(request);
      await this.securityManager.validateContent(content);

      // Create cache entry
      const entry = await this.createCacheEntry(request, content);

      // Distribute to cache nodes
      await this.distributionEngine.distribute(entry, request.options);

      // Store entry
      this.entries.set(request.key, entry);

      // Update statistics
      await this.analyticsEngine.recordStore(request, entry);

      this.emit("cache:stored", { key: request.key, entry });

      return {
        success: true,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "global",
        },
      };
    } catch (error) {
      this.logger.error("Cache put failed", { key: request.key, error });
      return this.createErrorResponse("CACHE_PUT_FAILED", error.message);
    }
  }

  /**
   * Deletes content from cache
   */
  async delete(key: string): Promise<ServiceResponse<void>> {
    try {
      this.logger.debug("Cache delete request", { key });

      const entry = this.entries.get(key);
      if (!entry) {
        throw new Error(`Cache entry not found: ${key}`);
      }

      // Remove from all cache locations
      await this.distributionEngine.remove(entry);

      // Remove entry
      this.entries.delete(key);

      // Update statistics
      await this.analyticsEngine.recordDelete(key);

      this.emit("cache:deleted", { key });

      return {
        success: true,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "global",
        },
      };
    } catch (error) {
      this.logger.error("Cache delete failed", { key, error });
      return this.createErrorResponse("CACHE_DELETE_FAILED", error.message);
    }
  }

  /**
   * Invalidates cache entries based on patterns or tags
   */
  async invalidate(
    invalidation: CacheInvalidation,
  ): Promise<ServiceResponse<number>> {
    try {
      this.logger.info("Cache invalidation request", {
        patterns: invalidation.patterns,
        tags: invalidation.tags,
      });

      const invalidatedCount =
        await this.invalidationEngine.invalidate(invalidation);

      this.emit("cache:invalidated", { invalidation, count: invalidatedCount });

      return {
        success: true,
        data: invalidatedCount,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "global",
        },
      };
    } catch (error) {
      this.logger.error("Cache invalidation failed", { invalidation, error });
      return this.createErrorResponse(
        "CACHE_INVALIDATION_FAILED",
        error.message,
      );
    }
  }

  /**
   * Gets cache statistics
   */
  async getStatistics(): Promise<ServiceResponse<CacheStatistics>> {
    try {
      const stats = await this.analyticsEngine.getStatistics();

      return {
        success: true,
        data: stats,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "global",
        },
      };
    } catch (error) {
      this.logger.error("Failed to get statistics", error);
      return this.createErrorResponse("STATISTICS_GET_FAILED", error.message);
    }
  }

  /**
   * Lists cache nodes
   */
  async listNodes(): Promise<ServiceResponse<CacheNode[]>> {
    try {
      const nodes = Array.from(this.nodes.values());

      return {
        success: true,
        data: nodes,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "global",
        },
      };
    } catch (error) {
      this.logger.error("Failed to list nodes", error);
      return this.createErrorResponse("NODES_LIST_FAILED", error.message);
    }
  }

  /**
   * Gets performance metrics
   */
  async getMetrics(): Promise<ServiceResponse<PerformanceMetrics>> {
    try {
      const metrics = await this.analyticsEngine.getMetrics();

      return {
        success: true,
        data: metrics,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "global",
        },
      };
    } catch (error) {
      this.logger.error("Failed to get metrics", error);
      return this.createErrorResponse("METRICS_GET_FAILED", error.message);
    }
  }

  /**
   * Optimizes cache configuration
   */
  async optimize(): Promise<ServiceResponse<OptimizationResult>> {
    try {
      this.logger.info("Starting cache optimization");

      const result = await this.optimizationEngine.optimize(
        Array.from(this.nodes.values()),
        Array.from(this.entries.values()),
      );

      return {
        success: true,
        data: result,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "global",
        },
      };
    } catch (error) {
      this.logger.error("Cache optimization failed", error);
      return this.createErrorResponse("OPTIMIZATION_FAILED", error.message);
    }
  }

  // ==================== Private Helper Methods ====================

  private initializeComponents(): void {
    this.cacheEngine = new CacheEngine(this.config);
    this.distributionEngine = new DistributionEngine(this.config);
    this.invalidationEngine = new InvalidationEngine(this.config);
    this.analyticsEngine = new AnalyticsEngine(this.config);
    this.optimizationEngine = new OptimizationEngine(this.config);
    this.securityManager = new CacheSecurityManager();
  }

  private setupEventHandlers(): void {
    this.cacheEngine.on("cache:hit", this.handleCacheHit.bind(this));
    this.cacheEngine.on("cache:miss", this.handleCacheMiss.bind(this));
    this.distributionEngine.on(
      "distribution:completed",
      this.handleDistributionCompleted.bind(this),
    );
    this.optimizationEngine.on(
      "optimization:completed",
      this.handleOptimizationCompleted.bind(this),
    );
  }

  private async initializeCacheNodes(): Promise<void> {
    // Initialize cache nodes based on configuration
    for (const layer of this.config.layers) {
      const node: CacheNode = {
        id: this.generateNodeId(layer.name),
        type: this.mapLayerType(layer.type),
        location: this.getDefaultLocation(),
        capacity: {
          storage: layer.size * 1024 * 1024, // Convert MB to bytes
          bandwidth: 1000 * 1024 * 1024, // 1GB/s
          connections: 10000,
          requests: 1000,
        },
        utilization: {
          storage: 0,
          bandwidth: 0,
          connections: 0,
          requests: 0,
          efficiency: 100,
        },
        performance: {
          hitRate: 0,
          missRate: 0,
          latency: { mean: 0, p50: 0, p95: 0, p99: 0, max: 0 },
          throughput: { current: 0, peak: 0, average: 0 },
          errors: { rate: 0, types: {}, recent: [] },
        },
        health: {
          status: "healthy",
          score: 100,
          issues: [],
          lastCheck: new Date(),
          uptime: 0,
        },
        configuration: {
          tier: 1,
          weight: 100,
          policies: [],
          rules: [],
          limits: {
            maxFileSize: 100 * 1024 * 1024, // 100MB
            maxRequestRate: 1000,
            maxBandwidth: 1000 * 1024 * 1024,
            maxConnections: 10000,
          },
        },
      };

      this.nodes.set(node.id, node);
    }
  }

  private async selectOptimalNode(request: CacheRequest): Promise<CacheNode> {
    const nodes = Array.from(this.nodes.values()).filter(
      (node) =>
        node.health.status === "healthy" || node.health.status === "degraded",
    );

    if (nodes.length === 0) {
      throw new Error("No healthy cache nodes available");
    }

    // Score nodes based on performance and proximity
    const scoredNodes = nodes.map((node) => ({
      node,
      score: this.calculateNodeScore(node, request),
    }));

    // Sort by score descending
    scoredNodes.sort((a, b) => b.score - a.score);

    return scoredNodes[0].node;
  }

  private calculateNodeScore(node: CacheNode, request: CacheRequest): number {
    let score = 0;

    // Performance score (0-40)
    score += (node.performance.hitRate / 100) * 20;
    score += (1 - node.performance.latency.mean / 1000) * 20;

    // Health score (0-30)
    score += (node.health.score / 100) * 30;

    // Utilization score (0-30) - lower utilization is better
    const avgUtilization =
      (node.utilization.storage +
        node.utilization.bandwidth +
        node.utilization.connections) /
      3;
    score += (1 - avgUtilization / 100) * 30;

    return score;
  }

  private async createCacheEntry(
    request: CacheRequest,
    content: CacheContent,
  ): Promise<CacheEntry> {
    const now = new Date();
    const ttl = request.options?.ttl || this.config.strategy.ttl || 3600;

    return {
      key: request.key,
      content,
      metadata: {
        created: now,
        expires: new Date(now.getTime() + ttl * 1000),
        lastAccessed: now,
        lastModified: now,
        ttl,
        priority: request.metadata?.priority || 1,
        tags: request.metadata?.tags || [],
        source: "cache-manager",
      },
      stats: {
        hits: 0,
        misses: 0,
        bytes: 0,
        requests: [],
        geographic: [],
      },
      locations: [],
    };
  }

  private async startMonitoring(): Promise<void> {
    // Start periodic monitoring of cache nodes
    setInterval(async () => {
      for (const node of this.nodes.values()) {
        await this.updateNodeHealth(node);
        await this.updateNodePerformance(node);
      }
    }, 30000); // Every 30 seconds
  }

  private async updateNodeHealth(node: CacheNode): Promise<void> {
    // Simulate health check
    node.health.lastCheck = new Date();
    node.health.uptime += 30; // Add 30 seconds

    // Check for issues
    if (node.utilization.storage > 90) {
      const issue: HealthIssue = {
        type: "capacity",
        severity: "high",
        description: "Storage utilization above 90%",
        timestamp: new Date(),
        resolved: false,
      };

      if (
        !node.health.issues.find((i) => i.type === "capacity" && !i.resolved)
      ) {
        node.health.issues.push(issue);
      }
    }

    // Update health score
    node.health.score = this.calculateHealthScore(node);
  }

  private async updateNodePerformance(node: CacheNode): Promise<void> {
    // Update performance metrics based on recent activity
    // This would typically come from actual monitoring data
  }

  private calculateHealthScore(node: CacheNode): number {
    let score = 100;

    // Deduct points for issues
    for (const issue of node.health.issues) {
      if (!issue.resolved) {
        switch (issue.severity) {
          case "critical":
            score -= 25;
            break;
          case "high":
            score -= 15;
            break;
          case "medium":
            score -= 10;
            break;
          case "low":
            score -= 5;
            break;
        }
      }
    }

    // Deduct points for high utilization
    const avgUtilization =
      (node.utilization.storage +
        node.utilization.bandwidth +
        node.utilization.connections) /
      3;

    if (avgUtilization > 80) score -= (avgUtilization - 80) / 2;

    return Math.max(0, Math.min(100, score));
  }

  // Utility methods
  private mapLayerType(
    type: string,
  ): "edge" | "regional" | "origin" | "memory" | "disk" {
    switch (type) {
      case "memory":
        return "memory";
      case "disk":
        return "disk";
      case "distributed":
        return "regional";
      case "cdn":
        return "edge";
      default:
        return "disk";
    }
  }

  private getDefaultLocation(): NodeLocation {
    return {
      region: "us-east-1",
      zone: "us-east-1a",
      city: "Virginia",
      country: "US",
      coordinates: { latitude: 38.9072, longitude: -77.0369 },
      provider: "local",
    };
  }

  private generateNodeId(name: string): string {
    return `node_${name}_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
  }

  private generateRequestId(): string {
    return `req_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
  }

  private createErrorResponse(
    code: string,
    message: string,
  ): ServiceResponse<any> {
    return {
      success: false,
      error: {
        code,
        message,
        retryable: false,
        timestamp: new Date(),
      },
      metadata: {
        requestId: this.generateRequestId(),
        timestamp: new Date(),
        processingTime: 0,
        region: "global",
      },
    };
  }

  private handleCacheHit(event: any): void {
    this.logger.debug("Cache hit", event);
    this.emit("cache:hit", event);
  }

  private handleCacheMiss(event: any): void {
    this.logger.debug("Cache miss", event);
    this.emit("cache:miss", event);
  }

  private handleDistributionCompleted(event: any): void {
    this.logger.debug("Distribution completed", event);
    this.emit("distribution:completed", event);
  }

  private handleOptimizationCompleted(event: any): void {
    this.logger.info("Optimization completed", event);
    this.emit("optimization:completed", event);
  }
}

// ==================== Supporting Interfaces ====================

interface OptimizationResult {
  improvements: CacheImprovement[];
  recommendations: CacheRecommendation[];
  impact: OptimizationImpact;
}

interface CacheImprovement {
  type: "hit_rate" | "latency" | "bandwidth" | "cost";
  description: string;
  before: number;
  after: number;
  improvement: number;
}

interface CacheRecommendation {
  title: string;
  description: string;
  priority: "low" | "medium" | "high";
  effort: "low" | "medium" | "high";
  impact: "low" | "medium" | "high";
}

interface OptimizationImpact {
  performance: number;
  cost: number;
  efficiency: number;
  reliability: number;
}

// ==================== Supporting Classes ====================
// (Abbreviated implementations for brevity)

class CacheEngine extends EventEmitter {
  private config: MediaCacheConfig;
  private logger: Logger;

  constructor(config: MediaCacheConfig) {
    super();
    this.config = config;
    this.logger = new Logger("CacheEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing cache engine");
  }

  async get(node: CacheNode, request: CacheRequest): Promise<CacheResponse> {
    // Cache get implementation
    const hit = Math.random() > 0.3; // 70% hit rate simulation

    this.emit(hit ? "cache:hit" : "cache:miss", {
      node: node.id,
      key: request.key,
    });

    return {
      hit,
      content: hit
        ? {
            data: Buffer.from("cached content"),
            headers: { "content-type": "text/plain" },
            contentType: "text/plain",
            size: 100,
            etag: "etag123",
            compressed: false,
            encrypted: false,
          }
        : undefined,
      source: hit ? node.id : "origin",
      latency: Math.random() * 100,
      metadata: {
        cached: new Date(),
        expires: new Date(Date.now() + 3600000),
        age: 60,
        fresh: true,
        etag: "etag123",
      },
    };
  }
}

class DistributionEngine extends EventEmitter {
  private config: MediaCacheConfig;
  private logger: Logger;

  constructor(config: MediaCacheConfig) {
    super();
    this.config = config;
    this.logger = new Logger("DistributionEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing distribution engine");
  }

  async distribute(entry: CacheEntry, options?: CacheOptions): Promise<void> {
    // Distribution implementation
    this.emit("distribution:completed", { key: entry.key });
  }

  async remove(entry: CacheEntry): Promise<void> {
    // Removal implementation
  }
}

class InvalidationEngine {
  private config: MediaCacheConfig;
  private logger: Logger;

  constructor(config: MediaCacheConfig) {
    this.config = config;
    this.logger = new Logger("InvalidationEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing invalidation engine");
  }

  async invalidate(invalidation: CacheInvalidation): Promise<number> {
    // Invalidation implementation
    return 0;
  }
}

class AnalyticsEngine {
  private config: MediaCacheConfig;
  private logger: Logger;

  constructor(config: MediaCacheConfig) {
    this.config = config;
    this.logger = new Logger("AnalyticsEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing analytics engine");
  }

  async recordAccess(
    request: CacheRequest,
    response: CacheResponse,
  ): Promise<void> {
    // Access recording implementation
  }

  async recordStore(request: CacheRequest, entry: CacheEntry): Promise<void> {
    // Store recording implementation
  }

  async recordDelete(key: string): Promise<void> {
    // Delete recording implementation
  }

  async getStatistics(): Promise<CacheStatistics> {
    // Statistics implementation
    return {
      global: {
        totalEntries: 0,
        totalSize: 0,
        hitRate: 70,
        missRate: 30,
        bandwidth: { ingress: 0, egress: 0, saved: 0 },
        requests: { total: 0, perSecond: 0, peak: 0, average: 0 },
      },
      nodes: [],
      content: [],
      geographic: [],
    };
  }

  async getMetrics(): Promise<PerformanceMetrics> {
    return {
      latency: { mean: 0, p50: 0, p95: 0, p99: 0, max: 0 },
      throughput: {
        requestsPerSecond: 0,
        bytesPerSecond: 0,
        operationsPerSecond: 0,
      },
      utilization: { cpu: 0, memory: 0, disk: 0, network: 0 },
      errors: { rate: 0, percentage: 0, types: {} },
    };
  }
}

class OptimizationEngine extends EventEmitter {
  private config: MediaCacheConfig;
  private logger: Logger;

  constructor(config: MediaCacheConfig) {
    super();
    this.config = config;
    this.logger = new Logger("OptimizationEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing optimization engine");
  }

  async optimize(
    nodes: CacheNode[],
    entries: CacheEntry[],
  ): Promise<OptimizationResult> {
    // Optimization implementation
    this.emit("optimization:completed", {
      nodes: nodes.length,
      entries: entries.length,
    });

    return {
      improvements: [],
      recommendations: [],
      impact: { performance: 0, cost: 0, efficiency: 0, reliability: 0 },
    };
  }
}

class CacheSecurityManager {
  private logger: Logger;

  constructor() {
    this.logger = new Logger("CacheSecurityManager");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing cache security manager");
  }

  async validateRequest(request: CacheRequest): Promise<void> {
    // Request validation implementation
  }

  async validateContent(content: CacheContent): Promise<void> {
    // Content validation implementation
  }
}