@clduab11/gemini-flow/src/streaming/edge-cache-cdn.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.

/**
 * Edge Caching and CDN Integration
 *
 * Advanced caching and content delivery system with:
 * - Geographic edge caching
 * - Intelligent cache invalidation
 * - Multi-CDN optimization
 * - Predictive pre-caching
 * - Real-time cache analytics
 */

import { EventEmitter } from "events";
import { Logger } from "../utils/logger.js";
import {
  EdgeCacheConfig,
  CDNConfiguration,
  MultiModalChunk,
  NetworkConditions,
  StreamingSession,
} from "../types/streaming.js";

export interface CacheEntry {
  id: string;
  key: string;
  data: ArrayBuffer | string;
  metadata: {
    size: number;
    mimeType: string;
    encoding?: string;
    quality: string;
    resolution?: string;
    bitrate?: number;
    checksum: string;
  };
  timestamps: {
    created: number;
    lastAccessed: number;
    lastModified: number;
    expires: number;
  };
  access: {
    count: number;
    frequency: number;
    sources: string[];
    geographic: string[];
  };
  status: "fresh" | "stale" | "expired" | "invalid";
  tags: string[];
  priority: number;
}

export interface EdgeNode {
  id: string;
  location: {
    region: string;
    country: string;
    city: string;
    coordinates: { lat: number; lng: number };
  };
  capacity: {
    storage: number;
    bandwidth: number;
    connections: number;
  };
  current: {
    storageUsed: number;
    bandwidthUsed: number;
    activeConnections: number;
    cacheHitRate: number;
  };
  performance: {
    averageLatency: number;
    reliability: number;
    loadScore: number;
  };
  status: "online" | "degraded" | "offline" | "maintenance";
  capabilities: string[];
}

export interface CacheStrategy {
  type: "lru" | "lfu" | "ttl" | "adaptive" | "predictive";
  parameters: {
    maxAge: number;
    maxSize: number;
    evictionThreshold: number;
    prefetchProbability: number;
    geographicRadius: number;
  };
  rules: CacheRule[];
}

export interface CacheRule {
  pattern: string | RegExp;
  action: "cache" | "bypass" | "prefetch" | "invalidate";
  conditions: {
    contentType?: string[];
    size?: { min?: number; max?: number };
    quality?: string[];
    geographic?: string[];
    timeOfDay?: { start: number; end: number };
  };
  priority: number;
  ttl?: number;
}

export interface CDNEndpoint {
  id: string;
  provider: string;
  url: string;
  region: string;
  capabilities: string[];
  performance: {
    latency: number;
    bandwidth: number;
    reliability: number;
    cost: number;
  };
  status: "active" | "standby" | "failed";
}

export interface CacheAnalytics {
  hitRate: number;
  missRate: number;
  bandwidth: {
    saved: number;
    total: number;
    efficiency: number;
  };
  latency: {
    cached: number;
    origin: number;
    improvement: number;
  };
  storage: {
    used: number;
    available: number;
    efficiency: number;
  };
  geographic: Map<
    string,
    {
      requests: number;
      hits: number;
      misses: number;
      bandwidth: number;
    }
  >;
  trends: {
    hourly: number[];
    daily: number[];
    weekly: number[];
  };
}

export class EdgeCacheCDN extends EventEmitter {
  private logger: Logger;
  private config: EdgeCacheConfig;
  private cdnConfig: CDNConfiguration;
  private edgeNodes = new Map<string, EdgeNode>();
  private cacheEntries = new Map<string, CacheEntry>();
  private cacheStrategies = new Map<string, CacheStrategy>();
  private cdnEndpoints = new Map<string, CDNEndpoint>();
  private analytics: CacheAnalytics;
  private nodeSelector: NodeSelector;
  private predictionEngine: CachePredictionEngine;
  private invalidationManager: InvalidationManager;
  private loadBalancer: CDNLoadBalancer;
  private compressionEngine: CompressionEngine;

  constructor(config: EdgeCacheConfig, cdnConfig: CDNConfiguration) {
    super();
    this.logger = new Logger("EdgeCacheCDN");
    this.config = config;
    this.cdnConfig = cdnConfig;

    this.nodeSelector = new NodeSelector();
    this.predictionEngine = new CachePredictionEngine();
    this.invalidationManager = new InvalidationManager();
    this.loadBalancer = new CDNLoadBalancer();
    this.compressionEngine = new CompressionEngine();

    this.initializeAnalytics();
    this.initializeEdgeNodes();
    this.initializeCDNEndpoints();
    this.setupCacheStrategies();
    this.startAnalyticsCollection();
  }

  /**
   * Cache multimedia content with intelligent placement
   */
  async cacheContent(
    key: string,
    data: ArrayBuffer | string,
    metadata: any,
    options?: {
      strategy?: string;
      ttl?: number;
      tags?: string[];
      geographic?: string[];
      priority?: number;
    },
  ): Promise<boolean> {
    try {
      const strategy = this.cacheStrategies.get(
        options?.strategy || "adaptive",
      );
      if (!strategy) {
        throw new Error(`Cache strategy not found: ${options?.strategy}`);
      }

      // Check if content should be cached based on rules
      if (!this.shouldCache(key, metadata, strategy)) {
        this.logger.debug("Content bypassed caching", { key });
        return false;
      }

      // Compress content if beneficial
      const compressedData = await this.compressionEngine.compress(
        data,
        metadata.mimeType,
      );

      // Create cache entry
      const entry: CacheEntry = {
        id: this.generateEntryId(),
        key,
        data: compressedData.data,
        metadata: {
          ...metadata,
          size: compressedData.data.byteLength || compressedData.data.length,
          encoding: compressedData.encoding,
          checksum: await this.calculateChecksum(compressedData.data),
        },
        timestamps: {
          created: Date.now(),
          lastAccessed: Date.now(),
          lastModified: Date.now(),
          expires: Date.now() + (options?.ttl || strategy.parameters.maxAge),
        },
        access: {
          count: 0,
          frequency: 0,
          sources: [],
          geographic: options?.geographic || [],
        },
        status: "fresh",
        tags: options?.tags || [],
        priority: options?.priority || 5,
      };

      // Select optimal edge nodes for placement
      const targetNodes = await this.selectCachingNodes(entry, strategy);

      if (targetNodes.length === 0) {
        this.logger.warn("No suitable edge nodes available", { key });
        return false;
      }

      // Store in selected nodes
      const cachePromises = targetNodes.map((node) =>
        this.storeCacheEntry(node, entry),
      );
      const results = await Promise.allSettled(cachePromises);

      const successCount = results.filter(
        (r) => r.status === "fulfilled",
      ).length;

      if (successCount > 0) {
        this.cacheEntries.set(key, entry);
        this.updateAnalytics("cache_stored", entry);

        this.logger.info("Content cached successfully", {
          key,
          nodes: successCount,
          size: entry.metadata.size,
          ttl: options?.ttl,
        });

        this.emit("content_cached", { key, entry, nodes: successCount });

        // Trigger predictive caching if enabled
        if (strategy.type === "predictive") {
          this.triggerPredictiveCaching(entry);
        }

        return true;
      }

      return false;
    } catch (error) {
      this.logger.error("Cache storage failed", {
        key,
        error: (error as Error).message,
      });
      return false;
    }
  }

  /**
   * Retrieve content from cache with fallback to origin
   */
  async retrieveContent(
    key: string,
    requestInfo?: {
      userLocation?: { lat: number; lng: number };
      quality?: string;
      acceptEncoding?: string[];
    },
  ): Promise<{
    data: ArrayBuffer | string;
    metadata: any;
    source: "cache" | "origin";
  } | null> {
    try {
      const entry = this.cacheEntries.get(key);

      if (!entry || entry.status === "expired" || entry.status === "invalid") {
        this.updateAnalytics("cache_miss", null, key);

        // Try to fetch from origin
        const originData = await this.fetchFromOrigin(key, requestInfo);
        if (originData) {
          // Cache the fetched content
          await this.cacheContent(key, originData.data, originData.metadata);
        }
        return originData ? { ...originData, source: "origin" } : null;
      }

      // Check if entry is stale and needs refresh
      if (entry.status === "stale") {
        // Asynchronously refresh in background
        this.refreshCacheEntry(key).catch((error) => {
          this.logger.warn("Background refresh failed", {
            key,
            error: error.message,
          });
        });
      }

      // Select best edge node for retrieval
      const optimalNode = await this.selectRetrievalNode(entry, requestInfo);

      if (!optimalNode) {
        this.updateAnalytics("cache_miss", null, key);
        return null;
      }

      // Retrieve from edge node
      const cachedData = await this.retrieveFromNode(optimalNode, entry);

      if (cachedData) {
        // Update access statistics
        entry.timestamps.lastAccessed = Date.now();
        entry.access.count++;

        // Add user location to geographic data
        if (requestInfo?.userLocation) {
          const region = await this.getRegionFromCoordinates(
            requestInfo.userLocation,
          );
          if (!entry.access.geographic.includes(region)) {
            entry.access.geographic.push(region);
          }
        }

        // Decompress if needed
        const decompressedData = await this.compressionEngine.decompress(
          cachedData,
          entry.metadata.encoding,
          requestInfo?.acceptEncoding,
        );

        this.updateAnalytics("cache_hit", entry);

        this.emit("content_retrieved", {
          key,
          entry,
          node: optimalNode.id,
          source: "cache",
        });

        return {
          data: decompressedData,
          metadata: entry.metadata,
          source: "cache",
        };
      }

      // Cache miss - fallback to origin
      this.updateAnalytics("cache_miss", null, key);
      const originData = await this.fetchFromOrigin(key, requestInfo);
      return originData ? { ...originData, source: "origin" } : null;
    } catch (error) {
      this.logger.error("Content retrieval failed", {
        key,
        error: (error as Error).message,
      });
      return null;
    }
  }

  /**
   * Invalidate cached content
   */
  async invalidateContent(
    pattern: string | RegExp,
    scope: "single" | "pattern" | "tags" | "global" = "single",
    options?: {
      cascade?: boolean;
      immediate?: boolean;
      notify?: boolean;
    },
  ): Promise<number> {
    const invalidatedCount = await this.invalidationManager.invalidate(
      pattern,
      scope,
      this.cacheEntries,
      this.edgeNodes,
      options,
    );

    this.logger.info("Cache invalidation completed", {
      pattern: pattern.toString(),
      scope,
      invalidated: invalidatedCount,
    });

    this.emit("cache_invalidated", { pattern, scope, count: invalidatedCount });
    return invalidatedCount;
  }

  /**
   * Prefetch content based on predictions
   */
  async prefetchContent(
    predictions: Array<{
      key: string;
      probability: number;
      metadata: any;
      targetRegions?: string[];
    }>,
  ): Promise<number> {
    let prefetchedCount = 0;

    for (const prediction of predictions) {
      if (prediction.probability > this.config.cacheKeys.custom?.[0] || 0.7) {
        try {
          // Fetch content from origin
          const content = await this.fetchFromOrigin(prediction.key);

          if (content) {
            // Cache with predictive strategy
            const cached = await this.cacheContent(
              prediction.key,
              content.data,
              content.metadata,
              {
                strategy: "predictive",
                tags: ["prefetched"],
                geographic: prediction.targetRegions,
                priority: Math.floor(prediction.probability * 10),
              },
            );

            if (cached) {
              prefetchedCount++;
            }
          }
        } catch (error) {
          this.logger.warn("Prefetch failed", {
            key: prediction.key,
            error: (error as Error).message,
          });
        }
      }
    }

    this.logger.info("Prefetch completed", {
      total: predictions.length,
      prefetched: prefetchedCount,
    });

    this.emit("prefetch_completed", {
      total: predictions.length,
      prefetched: prefetchedCount,
    });
    return prefetchedCount;
  }

  /**
   * Get cache analytics
   */
  getAnalytics(timeRange?: { start: number; end: number }): CacheAnalytics {
    return { ...this.analytics };
  }

  /**
   * Optimize cache distribution
   */
  async optimizeDistribution(): Promise<void> {
    this.logger.info("Starting cache distribution optimization");

    // Analyze access patterns
    const patterns = this.analyzeAccessPatterns();

    // Identify optimization opportunities
    const opportunities = this.identifyOptimizationOpportunities(patterns);

    // Execute optimizations
    for (const opportunity of opportunities) {
      await this.executeOptimization(opportunity);
    }

    this.emit("distribution_optimized", {
      opportunities: opportunities.length,
    });
  }

  /**
   * Select optimal caching nodes
   */
  private async selectCachingNodes(
    entry: CacheEntry,
    strategy: CacheStrategy,
  ): Promise<EdgeNode[]> {
    return this.nodeSelector.selectForCaching(
      Array.from(this.edgeNodes.values()),
      entry,
      strategy,
    );
  }

  /**
   * Select optimal retrieval node
   */
  private async selectRetrievalNode(
    entry: CacheEntry,
    requestInfo?: any,
  ): Promise<EdgeNode | null> {
    return this.nodeSelector.selectForRetrieval(
      Array.from(this.edgeNodes.values()),
      entry,
      requestInfo,
    );
  }

  /**
   * Check if content should be cached
   */
  private shouldCache(
    key: string,
    metadata: any,
    strategy: CacheStrategy,
  ): boolean {
    for (const rule of strategy.rules) {
      if (this.matchesRule(key, metadata, rule)) {
        return rule.action === "cache";
      }
    }

    // Default behavior based on strategy
    return strategy.type !== "bypass";
  }

  /**
   * Check if key/metadata matches cache rule
   */
  private matchesRule(key: string, metadata: any, rule: CacheRule): boolean {
    // Pattern matching
    if (typeof rule.pattern === "string") {
      if (!key.includes(rule.pattern)) return false;
    } else if (rule.pattern instanceof RegExp) {
      if (!rule.pattern.test(key)) return false;
    }

    // Condition matching
    if (
      rule.conditions.contentType &&
      !rule.conditions.contentType.includes(metadata.mimeType)
    ) {
      return false;
    }

    if (rule.conditions.size) {
      const size = metadata.size || 0;
      if (rule.conditions.size.min && size < rule.conditions.size.min)
        return false;
      if (rule.conditions.size.max && size > rule.conditions.size.max)
        return false;
    }

    if (
      rule.conditions.quality &&
      !rule.conditions.quality.includes(metadata.quality)
    ) {
      return false;
    }

    return true;
  }

  /**
   * Store cache entry in edge node
   */
  private async storeCacheEntry(
    node: EdgeNode,
    entry: CacheEntry,
  ): Promise<void> {
    // Check node capacity
    if (
      node.current.storageUsed + entry.metadata.size >
      node.capacity.storage
    ) {
      // Evict entries to make space
      await this.evictEntries(node, entry.metadata.size);
    }

    // Store entry (placeholder implementation)
    node.current.storageUsed += entry.metadata.size;

    this.logger.debug("Entry stored in edge node", {
      nodeId: node.id,
      entryId: entry.id,
      size: entry.metadata.size,
    });
  }

  /**
   * Retrieve cache entry from edge node
   */
  private async retrieveFromNode(
    node: EdgeNode,
    entry: CacheEntry,
  ): Promise<ArrayBuffer | string | null> {
    // Retrieve from edge node (placeholder implementation)
    node.current.activeConnections++;

    // Simulate network retrieval
    return entry.data;
  }

  /**
   * Fetch content from origin server
   */
  private async fetchFromOrigin(
    key: string,
    requestInfo?: any,
  ): Promise<{ data: ArrayBuffer | string; metadata: any } | null> {
    try {
      // Select best CDN endpoint
      const endpoint = await this.loadBalancer.selectEndpoint(
        Array.from(this.cdnEndpoints.values()),
        requestInfo,
      );

      if (!endpoint) {
        throw new Error("No CDN endpoint available");
      }

      // Fetch from CDN (placeholder implementation)
      const response = await this.performOriginFetch(endpoint, key);

      return response;
    } catch (error) {
      this.logger.error("Origin fetch failed", {
        key,
        error: (error as Error).message,
      });
      return null;
    }
  }

  /**
   * Perform actual origin fetch
   */
  private async performOriginFetch(
    endpoint: CDNEndpoint,
    key: string,
  ): Promise<{ data: ArrayBuffer | string; metadata: any } | null> {
    // Placeholder implementation for origin fetch
    return null;
  }

  /**
   * Refresh stale cache entry
   */
  private async refreshCacheEntry(key: string): Promise<void> {
    const freshContent = await this.fetchFromOrigin(key);
    if (freshContent) {
      await this.cacheContent(key, freshContent.data, freshContent.metadata);
    }
  }

  /**
   * Evict entries from node to make space
   */
  private async evictEntries(
    node: EdgeNode,
    neededSpace: number,
  ): Promise<void> {
    // Get all entries in this node
    const nodeEntries = Array.from(this.cacheEntries.values())
      .filter((entry) => this.isEntryInNode(entry, node))
      .sort(
        (a, b) =>
          this.calculateEvictionScore(a) - this.calculateEvictionScore(b),
      );

    let freedSpace = 0;
    const evicted: CacheEntry[] = [];

    for (const entry of nodeEntries) {
      if (freedSpace >= neededSpace) break;

      evicted.push(entry);
      freedSpace += entry.metadata.size;
      node.current.storageUsed -= entry.metadata.size;
    }

    this.logger.debug("Entries evicted from node", {
      nodeId: node.id,
      evicted: evicted.length,
      freedSpace,
    });
  }

  /**
   * Calculate eviction score (lower = evict first)
   */
  private calculateEvictionScore(entry: CacheEntry): number {
    const age = Date.now() - entry.timestamps.lastAccessed;
    const frequency = entry.access.frequency;
    const priority = entry.priority;

    // Score based on LRU, frequency, and priority
    return age / 1000 - frequency * 100 - priority * 50;
  }

  /**
   * Check if entry is stored in specific node
   */
  private isEntryInNode(entry: CacheEntry, node: EdgeNode): boolean {
    // Placeholder implementation - would check actual storage
    return true;
  }

  /**
   * Trigger predictive caching
   */
  private async triggerPredictiveCaching(entry: CacheEntry): Promise<void> {
    const predictions = await this.predictionEngine.generatePredictions(
      entry,
      Array.from(this.cacheEntries.values()),
    );

    if (predictions.length > 0) {
      await this.prefetchContent(predictions);
    }
  }

  /**
   * Analyze access patterns
   */
  private analyzeAccessPatterns(): any {
    // Access pattern analysis implementation
    return {};
  }

  /**
   * Identify optimization opportunities
   */
  private identifyOptimizationOpportunities(patterns: any): any[] {
    // Optimization opportunity identification
    return [];
  }

  /**
   * Execute optimization
   */
  private async executeOptimization(opportunity: any): Promise<void> {
    // Optimization execution
  }

  /**
   * Get region from coordinates
   */
  private async getRegionFromCoordinates(coordinates: {
    lat: number;
    lng: number;
  }): Promise<string> {
    // Geo-location to region mapping
    return "unknown";
  }

  /**
   * Calculate checksum for data integrity
   */
  private async calculateChecksum(data: ArrayBuffer | string): Promise<string> {
    // Simple checksum calculation (in production, use proper hashing)
    const str =
      typeof data === "string" ? data : new TextDecoder().decode(data);
    let hash = 0;
    for (let i = 0; i < str.length; i++) {
      const char = str.charCodeAt(i);
      hash = (hash << 5) - hash + char;
      hash = hash & hash; // Convert to 32-bit integer
    }
    return hash.toString(16);
  }

  /**
   * Generate unique entry ID
   */
  private generateEntryId(): string {
    return `cache-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
  }

  /**
   * Initialize analytics
   */
  private initializeAnalytics(): void {
    this.analytics = {
      hitRate: 0,
      missRate: 0,
      bandwidth: { saved: 0, total: 0, efficiency: 0 },
      latency: { cached: 0, origin: 0, improvement: 0 },
      storage: { used: 0, available: 0, efficiency: 0 },
      geographic: new Map(),
      trends: {
        hourly: new Array(24).fill(0),
        daily: new Array(7).fill(0),
        weekly: new Array(52).fill(0),
      },
    };
  }

  /**
   * Initialize edge nodes
   */
  private initializeEdgeNodes(): void {
    // Initialize with default edge nodes
    const defaultNodes = [
      {
        id: "us-east-1",
        location: {
          region: "us-east",
          country: "US",
          city: "Virginia",
          coordinates: { lat: 37.4316, lng: -78.6569 },
        },
        capacity: {
          storage: 1000000000,
          bandwidth: 1000000000,
          connections: 10000,
        },
        capabilities: ["http", "https", "http2", "compression"],
      },
      {
        id: "eu-west-1",
        location: {
          region: "eu-west",
          country: "IE",
          city: "Dublin",
          coordinates: { lat: 53.3498, lng: -6.2603 },
        },
        capacity: {
          storage: 1000000000,
          bandwidth: 1000000000,
          connections: 10000,
        },
        capabilities: ["http", "https", "http2", "compression"],
      },
    ];

    for (const nodeData of defaultNodes) {
      const node: EdgeNode = {
        ...nodeData,
        current: {
          storageUsed: 0,
          bandwidthUsed: 0,
          activeConnections: 0,
          cacheHitRate: 0,
        },
        performance: { averageLatency: 50, reliability: 0.99, loadScore: 0 },
        status: "online",
      };
      this.edgeNodes.set(node.id, node);
    }
  }

  /**
   * Initialize CDN endpoints
   */
  private initializeCDNEndpoints(): void {
    for (const endpoint of this.cdnConfig.endpoints.primary) {
      const cdnEndpoint: CDNEndpoint = {
        id: `cdn-${Date.now()}`,
        provider: this.cdnConfig.provider,
        url: endpoint,
        region: "global",
        capabilities: ["http", "https", "streaming"],
        performance: {
          latency: 100,
          bandwidth: 1000000000,
          reliability: 0.99,
          cost: 0.01,
        },
        status: "active",
      };
      this.cdnEndpoints.set(cdnEndpoint.id, cdnEndpoint);
    }
  }

  /**
   * Setup cache strategies
   */
  private setupCacheStrategies(): void {
    // Adaptive strategy
    this.cacheStrategies.set("adaptive", {
      type: "adaptive",
      parameters: {
        maxAge: 3600000, // 1 hour
        maxSize: 100000000, // 100 MB
        evictionThreshold: 0.8,
        prefetchProbability: 0.7,
        geographicRadius: 1000, // km
      },
      rules: [
        {
          pattern: /\.(mp4|webm|m4v)$/,
          action: "cache",
          conditions: { contentType: ["video/mp4", "video/webm"] },
          priority: 8,
          ttl: 7200000, // 2 hours
        },
        {
          pattern: /\.(mp3|opus|ogg)$/,
          action: "cache",
          conditions: { contentType: ["audio/mp3", "audio/opus"] },
          priority: 7,
          ttl: 3600000, // 1 hour
        },
      ],
    });

    // Predictive strategy
    this.cacheStrategies.set("predictive", {
      type: "predictive",
      parameters: {
        maxAge: 7200000, // 2 hours
        maxSize: 200000000, // 200 MB
        evictionThreshold: 0.9,
        prefetchProbability: 0.8,
        geographicRadius: 500, // km
      },
      rules: [
        {
          pattern: /.*/,
          action: "prefetch",
          conditions: {},
          priority: 5,
        },
      ],
    });
  }

  /**
   * Update analytics
   */
  private updateAnalytics(
    event: string,
    entry?: CacheEntry | null,
    key?: string,
  ): void {
    switch (event) {
      case "cache_hit":
        this.analytics.hitRate = this.analytics.hitRate * 0.9 + 1 * 0.1; // Exponential moving average
        break;
      case "cache_miss":
        this.analytics.missRate = this.analytics.missRate * 0.9 + 1 * 0.1;
        break;
      case "cache_stored":
        if (entry) {
          this.analytics.storage.used += entry.metadata.size;
        }
        break;
    }
  }

  /**
   * Start analytics collection
   */
  private startAnalyticsCollection(): void {
    setInterval(() => {
      this.collectAnalytics();
    }, 60000); // Collect every minute
  }

  /**
   * Collect current analytics
   */
  private collectAnalytics(): void {
    // Update storage efficiency
    const totalCapacity = Array.from(this.edgeNodes.values()).reduce(
      (sum, node) => sum + node.capacity.storage,
      0,
    );
    const totalUsed = Array.from(this.edgeNodes.values()).reduce(
      (sum, node) => sum + node.current.storageUsed,
      0,
    );

    this.analytics.storage.available = totalCapacity - totalUsed;
    this.analytics.storage.efficiency = totalUsed / totalCapacity;

    // Update bandwidth efficiency
    this.analytics.bandwidth.efficiency =
      this.analytics.bandwidth.saved / (this.analytics.bandwidth.total || 1);

    this.emit("analytics_updated", this.analytics);
  }

  /**
   * Clean up resources
   */
  cleanup(): void {
    this.cacheEntries.clear();
    this.cacheStrategies.clear();
    this.edgeNodes.clear();
    this.cdnEndpoints.clear();
    this.removeAllListeners();

    this.logger.info("Edge cache CDN cleaned up");
  }
}

/**
 * Node selector for optimal cache placement and retrieval
 */
class NodeSelector {
  selectForCaching(
    nodes: EdgeNode[],
    entry: CacheEntry,
    strategy: CacheStrategy,
  ): EdgeNode[] {
    // Select optimal nodes for caching based on strategy
    return nodes.filter((node) => node.status === "online").slice(0, 3);
  }

  selectForRetrieval(
    nodes: EdgeNode[],
    entry: CacheEntry,
    requestInfo?: any,
  ): EdgeNode | null {
    // Select optimal node for retrieval
    return nodes.find((node) => node.status === "online") || null;
  }
}

/**
 * Cache prediction engine
 */
class CachePredictionEngine {
  async generatePredictions(
    entry: CacheEntry,
    allEntries: CacheEntry[],
  ): Promise<any[]> {
    // Generate cache predictions based on patterns
    return [];
  }
}

/**
 * Cache invalidation manager
 */
class InvalidationManager {
  async invalidate(
    pattern: string | RegExp,
    scope: string,
    cacheEntries: Map<string, CacheEntry>,
    edgeNodes: Map<string, EdgeNode>,
    options?: any,
  ): Promise<number> {
    // Invalidation logic
    return 0;
  }
}

/**
 * CDN load balancer
 */
class CDNLoadBalancer {
  async selectEndpoint(
    endpoints: CDNEndpoint[],
    requestInfo?: any,
  ): Promise<CDNEndpoint | null> {
    // Select optimal CDN endpoint
    return endpoints.find((endpoint) => endpoint.status === "active") || null;
  }
}

/**
 * Compression engine for cache optimization
 */
class CompressionEngine {
  async compress(
    data: ArrayBuffer | string,
    mimeType: string,
  ): Promise<{ data: ArrayBuffer | string; encoding: string }> {
    // Compression logic (placeholder)
    return { data, encoding: "identity" };
  }

  async decompress(
    data: ArrayBuffer | string,
    encoding?: string,
    acceptEncoding?: string[],
  ): Promise<ArrayBuffer | string> {
    // Decompression logic (placeholder)
    return data;
  }
}