@clduab11/gemini-flow/src/services/google-services/infrastructure/a2a-multimedia-protocol.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.

/**
 * A2A (Agent-to-Agent) Multimedia Protocol Extensions
 *
 * Advanced protocol extensions for seamless multimedia communication
 * between autonomous agents, enabling real-time collaboration, content
 * sharing, and synchronized multimedia experiences.
 */

import { EventEmitter } from "events";
import { Logger } from "../../../utils/logger.js";
import {
  A2AProtocolConfig,
  ServiceResponse,
  ServiceError,
  PerformanceMetrics,
} from "../interfaces.js";
import {
  RoutingEngine,
  MediaStreamBuffer,
  StreamMonitor,
  SessionPersistenceManager,
  ProtocolStatisticsCalculator,
} from "./a2a-multimedia-protocol-extensions.js";
import { protocolHelpers } from "./a2a-multimedia-protocol-helpers.js";

export interface A2AMultimediaMessage {
  id: string;
  type:
    | "media_request"
    | "media_response"
    | "stream_start"
    | "stream_data"
    | "stream_end"
    | "sync_signal";
  sourceAgentId: string;
  targetAgentId: string;
  timestamp: Date;
  priority: "low" | "medium" | "high" | "critical";
  payload: MultimediaPayload;
  routing: RoutingInfo;
  security: SecurityContext;
  metadata: MessageMetadata;
}

export interface MultimediaPayload {
  contentType:
    | "video"
    | "audio"
    | "image"
    | "text"
    | "mixed"
    | "stream"
    | "control";
  encoding: string;
  compression: CompressionInfo;
  data?: Buffer | string | any;
  chunks?: MediaChunk[];
  references?: ContentReference[];
  synchronization?: SyncInfo;
}

export interface MediaChunk {
  id: string;
  sequence: number;
  timestamp: Date;
  data: Buffer;
  checksum: string;
  final: boolean;
}

export interface ContentReference {
  id: string;
  type: "url" | "hash" | "cache_key" | "storage_id";
  location: string;
  metadata: any;
}

export interface SyncInfo {
  sessionId: string;
  globalTimestamp: Date;
  sequenceNumber: number;
  synchronizationPoints: SyncPoint[];
}

export interface SyncPoint {
  timestamp: Date;
  markerType: "start" | "keyframe" | "chapter" | "end";
  metadata: any;
}

export interface CompressionInfo {
  algorithm: "gzip" | "lz4" | "zstd" | "brotli" | "custom";
  level: number;
  originalSize: number;
  compressedSize: number;
  ratio: number;
}

export interface RoutingInfo {
  path: string[];
  hops: number;
  preferredRoute: "direct" | "relay" | "multicast" | "broadcast";
  qos: QoSRequirements;
  failover: FailoverConfig;
}

export interface QoSRequirements {
  maxLatency: number; // milliseconds
  minBandwidth: number; // bytes/second
  reliability: number; // 0-1
  priority: number; // 0-100
}

export interface FailoverConfig {
  enabled: boolean;
  alternatives: string[];
  timeout: number;
  retryAttempts: number;
}

export interface SecurityContext {
  encryptionEnabled: boolean;
  encryptionAlgorithm: string;
  keyId: string;
  signature?: string;
  authentication: AuthenticationInfo;
  authorization: AuthorizationInfo;
}

export interface AuthenticationInfo {
  method: "token" | "certificate" | "signature" | "none";
  credentials: string;
  validated: boolean;
  expiresAt?: Date;
}

export interface AuthorizationInfo {
  permissions: string[];
  restrictions: string[];
  context: any;
}

export interface MessageMetadata {
  correlationId: string;
  replyTo?: string;
  expiration?: Date;
  attempts: number;
  tags: string[];
  trace: TraceInfo[];
}

export interface TraceInfo {
  agentId: string;
  timestamp: Date;
  operation: string;
  duration: number;
}

export interface A2AMultimediaSession {
  id: string;
  type: "streaming" | "request_response" | "broadcast" | "multicast" | "sync";
  participants: SessionParticipant[];
  configuration: SessionConfiguration;
  state: SessionState;
  statistics: SessionStatistics;
  synchronization: SessionSynchronization;
}

export interface SessionParticipant {
  agentId: string;
  role: "initiator" | "participant" | "observer" | "coordinator";
  capabilities: AgentCapabilities;
  status: "connected" | "connecting" | "disconnected" | "error";
  lastSeen: Date;
}

export interface AgentCapabilities {
  mediaTypes: string[];
  codecs: CodecSupport[];
  maxBandwidth: number;
  maxLatency: number;
  features: string[];
  hardware: HardwareCapabilities;
}

export interface CodecSupport {
  name: string;
  version: string;
  encode: boolean;
  decode: boolean;
  quality: number;
}

export interface HardwareCapabilities {
  gpu: boolean;
  simd: boolean;
  threading: number;
  memory: number;
  storage: number;
}

export interface SessionConfiguration {
  quality: QualityProfile;
  synchronization: SynchronizationConfig;
  failover: FailoverPolicy;
  security: SecurityPolicy;
  optimization: OptimizationConfig;
}

export interface QualityProfile {
  video?: VideoQualityConfig;
  audio?: AudioQualityConfig;
  adaptiveBitrate: boolean;
  qualityLadder: QualityLevel[];
}

export interface VideoQualityConfig {
  resolution: { width: number; height: number };
  framerate: number;
  bitrate: number;
  codec: string;
  profile: string;
}

export interface AudioQualityConfig {
  sampleRate: number;
  channels: number;
  bitrate: number;
  codec: string;
  profile: string;
}

export interface QualityLevel {
  level: number;
  video?: VideoQualityConfig;
  audio?: AudioQualityConfig;
  bandwidth: number;
  priority: number;
}

export interface SynchronizationConfig {
  enabled: boolean;
  tolerance: number; // milliseconds
  method: "ntp" | "ptp" | "custom";
  coordinator: string;
  syncPoints: string[];
}

export interface FailoverPolicy {
  enabled: boolean;
  healthCheckInterval: number;
  timeoutThreshold: number;
  strategies: FailoverStrategy[];
}

export interface FailoverStrategy {
  name: string;
  conditions: FailoverCondition[];
  actions: FailoverAction[];
  priority: number;
}

export interface FailoverCondition {
  metric: string;
  operator: ">" | "<" | "==" | "!=" | ">=" | "<=";
  threshold: number;
  duration: number;
}

export interface FailoverAction {
  type: "retry" | "reroute" | "degrade" | "disconnect";
  parameters: any;
  delay: number;
}

export interface SecurityPolicy {
  encryptionRequired: boolean;
  algorithms: string[];
  keyRotation: KeyRotationConfig;
  accessControl: AccessControlConfig;
  audit: AuditConfig;
}

export interface KeyRotationConfig {
  enabled: boolean;
  interval: number; // seconds
  algorithm: string;
  keySize: number;
}

export interface AccessControlConfig {
  mode: "permissive" | "restrictive";
  whitelist: string[];
  blacklist: string[];
  rateLimit: RateLimitConfig;
}

export interface RateLimitConfig {
  enabled: boolean;
  requestsPerSecond: number;
  burstSize: number;
  windowSize: number;
}

export interface AuditConfig {
  enabled: boolean;
  events: string[];
  storage: "local" | "remote" | "distributed";
  retention: number; // days
}

export interface OptimizationConfig {
  compression: CompressionConfig;
  caching: CachingConfig;
  prefetching: PrefetchingConfig;
  batching: BatchingConfig;
}

export interface CompressionConfig {
  enabled: boolean;
  algorithms: string[];
  threshold: number; // minimum size to compress
  level: number;
}

export interface CachingConfig {
  enabled: boolean;
  ttl: number; // seconds
  maxSize: number; // bytes
  strategy: "lru" | "lfu" | "fifo";
}

export interface PrefetchingConfig {
  enabled: boolean;
  predictive: boolean;
  window: number; // seconds
  threshold: number; // confidence
}

export interface BatchingConfig {
  enabled: boolean;
  maxSize: number; // bytes
  maxDelay: number; // milliseconds
  strategy: "size" | "time" | "adaptive";
}

export interface SessionState {
  phase:
    | "initializing"
    | "negotiating"
    | "active"
    | "pausing"
    | "resuming"
    | "terminating"
    | "terminated";
  startTime: Date;
  lastActivity: Date;
  errors: SessionError[];
  warnings: SessionWarning[];
}

export interface SessionError {
  id: string;
  timestamp: Date;
  source: string;
  type: string;
  message: string;
  severity: "low" | "medium" | "high" | "critical";
  recovered: boolean;
}

export interface SessionWarning {
  id: string;
  timestamp: Date;
  source: string;
  type: string;
  message: string;
  acknowledged: boolean;
}

export interface SessionStatistics {
  messages: MessageStatistics;
  bandwidth: BandwidthStatistics;
  latency: LatencyStatistics;
  quality: QualityStatistics;
  errors: ErrorStatistics;
}

export interface MessageStatistics {
  sent: number;
  received: number;
  dropped: number;
  retransmitted: number;
  duplicate: number;
}

export interface BandwidthStatistics {
  upload: BandwidthMetrics;
  download: BandwidthMetrics;
  total: BandwidthMetrics;
}

export interface BandwidthMetrics {
  current: number;
  average: number;
  peak: number;
  utilization: number;
}

export interface LatencyStatistics {
  current: number;
  average: number;
  min: number;
  max: number;
  p50: number;
  p95: number;
  p99: number;
}

export interface QualityStatistics {
  video?: VideoQualityMetrics;
  audio?: AudioQualityMetrics;
  overall: QualityScore;
}

export interface VideoQualityMetrics {
  resolution: { width: number; height: number };
  framerate: FramerateMetrics;
  bitrate: BitrateMetrics;
  drops: number;
  freezes: number;
}

export interface FramerateMetrics {
  target: number;
  actual: number;
  stability: number;
}

export interface BitrateMetrics {
  target: number;
  actual: number;
  variability: number;
}

export interface AudioQualityMetrics {
  sampleRate: number;
  bitrate: BitrateMetrics;
  dropouts: number;
  latency: number;
}

export interface QualityScore {
  overall: number; // 0-100
  stability: number; // 0-100
  consistency: number; // 0-100
}

export interface ErrorStatistics {
  total: number;
  rate: number;
  types: Record<string, number>;
  recovery: RecoveryStatistics;
}

export interface RecoveryStatistics {
  attempts: number;
  successful: number;
  failed: number;
  averageTime: number;
}

export interface SessionSynchronization {
  enabled: boolean;
  coordinator: string;
  globalClock: Date;
  offset: number;
  drift: number;
  quality: SyncQuality;
}

export interface SyncQuality {
  accuracy: number; // milliseconds
  precision: number; // milliseconds
  stability: number; // 0-1
}

export interface ProtocolCapabilityNegotiation {
  initiatorId: string;
  targetId: string;
  requestedCapabilities: AgentCapabilities;
  offeredCapabilities: AgentCapabilities;
  agreedCapabilities: AgentCapabilities;
  negotiationStatus: "pending" | "agreed" | "failed";
  alternatives: AlternativeCapability[];
}

export interface AlternativeCapability {
  capability: string;
  fallbacks: string[];
  priority: number;
  available: boolean;
}

export interface ContentDistributionStrategy {
  strategy: "unicast" | "multicast" | "broadcast" | "adaptive";
  targets: string[];
  routing: RoutingStrategy;
  optimization: DistributionOptimization;
}

export interface RoutingStrategy {
  algorithm:
    | "shortest_path"
    | "least_congested"
    | "highest_bandwidth"
    | "lowest_latency";
  constraints: RoutingConstraint[];
  fallbacks: string[];
}

export interface RoutingConstraint {
  type: "bandwidth" | "latency" | "reliability" | "cost";
  operator: ">" | "<" | "==" | "!=" | ">=" | "<=";
  value: number;
  weight: number;
}

export interface DistributionOptimization {
  compression: boolean;
  deduplication: boolean;
  caching: boolean;
  prefetching: boolean;
  loadBalancing: boolean;
}

export class A2AMultimediaProtocol extends EventEmitter {
  private logger: Logger;
  private config: A2AProtocolConfig;
  private activeSessions: Map<string, A2AMultimediaSession> = new Map();
  private messageQueue: Map<string, A2AMultimediaMessage[]> = new Map();
  private routingTable: Map<string, string[]> = new Map();
  private capabilities: Map<string, AgentCapabilities> = new Map();
  private securityManager: ProtocolSecurityManager;
  private compressionEngine: CompressionEngine;
  private synchronizationEngine: SynchronizationEngine;
  private qualityManager: QualityManager;
  private routingEngine: RoutingEngine;
  private activeStreams: Map<string, any> = new Map();
  private sessionPersistence: SessionPersistenceManager;
  private statisticsCalculator: ProtocolStatisticsCalculator;

  constructor(config: A2AProtocolConfig) {
    super();
    this.config = config;
    this.logger = new Logger("A2AMultimediaProtocol");

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

  /**
   * Initializes the A2A multimedia protocol
   */
  async initialize(): Promise<void> {
    try {
      this.logger.info("Initializing A2A Multimedia Protocol");

      // Initialize protocol components
      await this.securityManager.initialize();
      await this.compressionEngine.initialize();
      await this.synchronizationEngine.initialize();
      await this.qualityManager.initialize();
      await this.routingEngine.initialize();

      // Start protocol services
      await this.startProtocolServices();

      this.emit("initialized");
    } catch (error) {
      this.logger.error("Failed to initialize A2A protocol", error);
      throw error;
    }
  }

  /**
   * Creates a new multimedia session between agents
   */
  async createMultimediaSession(sessionConfig: {
    type: "streaming" | "request_response" | "broadcast" | "multicast" | "sync";
    initiatorId: string;
    participants: string[];
    configuration?: Partial<SessionConfiguration>;
    metadata?: any;
  }): Promise<ServiceResponse<A2AMultimediaSession>> {
    const startTime = Date.now();

    try {
      this.logger.info("Creating multimedia session", {
        type: sessionConfig.type,
        initiator: sessionConfig.initiatorId,
        participants: sessionConfig.participants.length,
      });

      // Generate session ID
      const sessionId = this.generateSessionId();

      // Negotiate capabilities with all participants
      const capabilityNegotiation = await this.negotiateCapabilities(
        sessionConfig.initiatorId,
        sessionConfig.participants,
      );

      if (capabilityNegotiation.negotiationStatus === "failed") {
        throw new Error("Capability negotiation failed");
      }

      // Create session participants
      const participants: SessionParticipant[] = [
        {
          agentId: sessionConfig.initiatorId,
          role: "initiator",
          capabilities: capabilityNegotiation.agreedCapabilities,
          status: "connected",
          lastSeen: new Date(),
        },
        ...sessionConfig.participants.map((agentId) => ({
          agentId,
          role: "participant" as const,
          capabilities: capabilityNegotiation.agreedCapabilities,
          status: "connecting" as const,
          lastSeen: new Date(),
        })),
      ];

      // Create session configuration
      const configuration: SessionConfiguration = {
        quality: this.createQualityProfile(
          capabilityNegotiation.agreedCapabilities,
        ),
        synchronization: this.createSynchronizationConfig(),
        failover: this.createFailoverPolicy(),
        security: this.createSecurityPolicy(),
        optimization: this.createOptimizationConfig(),
        ...sessionConfig.configuration,
      };

      // Create multimedia session
      const session: A2AMultimediaSession = {
        id: sessionId,
        type: sessionConfig.type,
        participants,
        configuration,
        state: {
          phase: "initializing",
          startTime: new Date(),
          lastActivity: new Date(),
          errors: [],
          warnings: [],
        },
        statistics: this.initializeSessionStatistics(),
        synchronization: {
          enabled: configuration.synchronization.enabled,
          coordinator: sessionConfig.initiatorId,
          globalClock: new Date(),
          offset: 0,
          drift: 0,
          quality: { accuracy: 0, precision: 0, stability: 1 },
        },
      };

      // Store session
      this.activeSessions.set(sessionId, session);

      // Initialize session protocols
      await this.initializeSessionProtocols(session);

      // Transition to negotiating phase
      session.state.phase = "negotiating";

      this.emit("session:created", { sessionId, session });

      return {
        success: true,
        data: session,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: Date.now() - startTime,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to create multimedia session", error);
      return this.createErrorResponse("SESSION_CREATION_FAILED", error.message);
    }
  }

  /**
   * Sends multimedia message between agents
   */
  async sendMultimediaMessage(
    message: Omit<A2AMultimediaMessage, "id" | "timestamp" | "metadata">,
  ): Promise<ServiceResponse<{ messageId: string; delivered: boolean }>> {
    try {
      // Create full message
      const fullMessage: A2AMultimediaMessage = {
        id: this.generateMessageId(),
        timestamp: new Date(),
        metadata: {
          correlationId: this.generateCorrelationId(),
          attempts: 0,
          tags: [],
          trace: [
            {
              agentId: message.sourceAgentId,
              timestamp: new Date(),
              operation: "send",
              duration: 0,
            },
          ],
        },
        ...message,
      };

      // Validate message
      await this.validateMessage(fullMessage);

      // Apply security
      await this.securityManager.secureMessage(fullMessage);

      // Compress payload if needed
      if (this.shouldCompressMessage(fullMessage)) {
        fullMessage.payload = await this.compressionEngine.compressPayload(
          fullMessage.payload,
        );
      }

      // Route message
      const delivered = await this.routeMessage(fullMessage);

      this.emit("message:sent", {
        messageId: fullMessage.id,
        message: fullMessage,
      });

      return {
        success: true,
        data: { messageId: fullMessage.id, delivered },
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to send multimedia message", error);
      return this.createErrorResponse("MESSAGE_SEND_FAILED", error.message);
    }
  }

  /**
   * Starts multimedia streaming between agents
   */
  async startMultimediaStream(
    sessionId: string,
    streamConfig: {
      sourceAgentId: string;
      targetAgents: string[];
      mediaType: "video" | "audio" | "mixed";
      quality: string;
      synchronization?: boolean;
    },
  ): Promise<ServiceResponse<{ streamId: string; endpoints: string[] }>> {
    try {
      const session = this.activeSessions.get(sessionId);
      if (!session) {
        throw new Error(`Session ${sessionId} not found`);
      }

      const streamId = this.generateStreamId();

      this.logger.info("Starting multimedia stream", {
        sessionId,
        streamId,
        mediaType: streamConfig.mediaType,
        targets: streamConfig.targetAgents.length,
      });

      // Initialize streaming endpoints
      const endpoints = await this.initializeStreamingEndpoints(
        streamId,
        streamConfig,
      );

      // Start streaming session
      await this.startStreamingSession(session, streamId, streamConfig);

      // Update session state
      session.state.phase = "active";
      session.state.lastActivity = new Date();

      this.emit("stream:started", { sessionId, streamId, streamConfig });

      return {
        success: true,
        data: { streamId, endpoints },
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to start multimedia stream", error);
      return this.createErrorResponse("STREAM_START_FAILED", error.message);
    }
  }

  /**
   * Synchronizes multimedia content across agents
   */
  async synchronizeContent(
    sessionId: string,
    syncConfig: {
      contentId: string;
      synchronizationPoints: SyncPoint[];
      tolerance: number;
      participants: string[];
    },
  ): Promise<
    ServiceResponse<{ synchronized: boolean; participants: string[] }>
  > {
    try {
      const session = this.activeSessions.get(sessionId);
      if (!session) {
        throw new Error(`Session ${sessionId} not found`);
      }

      this.logger.info("Synchronizing multimedia content", {
        sessionId,
        contentId: syncConfig.contentId,
        participants: syncConfig.participants.length,
      });

      // Execute synchronization
      const syncResult = await this.synchronizationEngine.synchronizeContent(
        session,
        syncConfig,
      );

      // Update session synchronization state
      session.synchronization.quality = syncResult.quality;
      session.state.lastActivity = new Date();

      this.emit("content:synchronized", {
        sessionId,
        contentId: syncConfig.contentId,
        result: syncResult,
      });

      return {
        success: true,
        data: {
          synchronized: syncResult.synchronized,
          participants: syncResult.participantStatus.map((p) => p.agentId),
        },
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to synchronize content", error);
      return this.createErrorResponse("SYNC_FAILED", error.message);
    }
  }

  /**
   * Gets session statistics and metrics
   */
  async getSessionStatistics(
    sessionId: string,
  ): Promise<ServiceResponse<SessionStatistics>> {
    try {
      const session = this.activeSessions.get(sessionId);
      if (!session) {
        throw new Error(`Session ${sessionId} not found`);
      }

      // Update real-time statistics
      const currentStats = await this.calculateCurrentStatistics(session);
      session.statistics = { ...session.statistics, ...currentStats };

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

  /**
   * Lists active multimedia sessions
   */
  async listActiveSessions(): Promise<ServiceResponse<A2AMultimediaSession[]>> {
    try {
      const sessions = Array.from(this.activeSessions.values());

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

  /**
   * Gets performance metrics for the protocol
   */
  async getProtocolMetrics(): Promise<ServiceResponse<PerformanceMetrics>> {
    try {
      const metrics: PerformanceMetrics = {
        latency: await this.calculateLatencyMetrics(),
        throughput: await this.calculateThroughputMetrics(),
        utilization: await this.calculateUtilizationMetrics(),
        errors: await this.calculateErrorMetrics(),
      };

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

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

  private initializeComponents(): void {
    this.securityManager = new ProtocolSecurityManager(this.config.security);
    this.compressionEngine = new CompressionEngine(this.config.compression);
    this.synchronizationEngine = new SynchronizationEngine(
      this.config.synchronization,
    );
    this.qualityManager = new QualityManager();
    this.routingEngine = new RoutingEngine();
    this.sessionPersistence = new SessionPersistenceManager(
      this.config.persistence,
    );
    this.statisticsCalculator = new ProtocolStatisticsCalculator();
  }

  private setupEventHandlers(): void {
    this.securityManager.on(
      "security:violation",
      this.handleSecurityViolation.bind(this),
    );
    this.routingEngine.on("route:failed", this.handleRoutingFailure.bind(this));
    this.qualityManager.on(
      "quality:degraded",
      this.handleQualityDegradation.bind(this),
    );
  }

  private async startProtocolServices(): Promise<void> {
    // Start background services
    this.startMessageProcessing();
    this.startHealthChecking();
    this.startMetricsCollection();
  }

  private async negotiateCapabilities(
    initiatorId: string,
    participants: string[],
  ): Promise<ProtocolCapabilityNegotiation> {
    // Capability negotiation implementation
    return {
      initiatorId,
      targetId: participants[0],
      requestedCapabilities: this.getDefaultCapabilities(),
      offeredCapabilities: this.getDefaultCapabilities(),
      agreedCapabilities: this.getDefaultCapabilities(),
      negotiationStatus: "agreed",
      alternatives: [],
    };
  }

  private getDefaultCapabilities(): AgentCapabilities {
    return {
      mediaTypes: ["video", "audio", "image"],
      codecs: [
        {
          name: "H264",
          version: "1.0",
          encode: true,
          decode: true,
          quality: 90,
        },
        {
          name: "Opus",
          version: "1.3",
          encode: true,
          decode: true,
          quality: 95,
        },
      ],
      maxBandwidth: 10000000,
      maxLatency: 100,
      features: ["streaming", "synchronization", "compression"],
      hardware: {
        gpu: true,
        simd: true,
        threading: 4,
        memory: 8192,
        storage: 1000000,
      },
    };
  }

  private createQualityProfile(
    capabilities: AgentCapabilities,
  ): QualityProfile {
    return {
      video: {
        resolution: { width: 1280, height: 720 },
        framerate: 30,
        bitrate: 2000000,
        codec: "H264",
        profile: "high",
      },
      audio: {
        sampleRate: 48000,
        channels: 2,
        bitrate: 128000,
        codec: "Opus",
        profile: "music",
      },
      adaptiveBitrate: true,
      qualityLadder: [
        { level: 1, bandwidth: 500000, priority: 1 },
        { level: 2, bandwidth: 1000000, priority: 2 },
        { level: 3, bandwidth: 2000000, priority: 3 },
      ],
    };
  }

  private createSynchronizationConfig(): SynchronizationConfig {
    return {
      enabled: true,
      tolerance: 50,
      method: "ntp",
      coordinator: "",
      syncPoints: ["keyframe", "chapter"],
    };
  }

  private createFailoverPolicy(): FailoverPolicy {
    return {
      enabled: true,
      healthCheckInterval: 5000,
      timeoutThreshold: 10000,
      strategies: [],
    };
  }

  private createSecurityPolicy(): SecurityPolicy {
    return {
      encryptionRequired: false,
      algorithms: ["AES-256"],
      keyRotation: {
        enabled: false,
        interval: 3600,
        algorithm: "AES",
        keySize: 256,
      },
      accessControl: {
        mode: "permissive",
        whitelist: [],
        blacklist: [],
        rateLimit: {
          enabled: false,
          requestsPerSecond: 100,
          burstSize: 10,
          windowSize: 1,
        },
      },
      audit: { enabled: false, events: [], storage: "local", retention: 30 },
    };
  }

  private createOptimizationConfig(): OptimizationConfig {
    return {
      compression: {
        enabled: true,
        algorithms: ["gzip"],
        threshold: 1024,
        level: 6,
      },
      caching: { enabled: true, ttl: 300, maxSize: 10485760, strategy: "lru" },
      prefetching: {
        enabled: false,
        predictive: false,
        window: 10,
        threshold: 0.8,
      },
      batching: {
        enabled: false,
        maxSize: 65536,
        maxDelay: 100,
        strategy: "adaptive",
      },
    };
  }

  private initializeSessionStatistics(): SessionStatistics {
    return {
      messages: {
        sent: 0,
        received: 0,
        dropped: 0,
        retransmitted: 0,
        duplicate: 0,
      },
      bandwidth: {
        upload: { current: 0, average: 0, peak: 0, utilization: 0 },
        download: { current: 0, average: 0, peak: 0, utilization: 0 },
        total: { current: 0, average: 0, peak: 0, utilization: 0 },
      },
      latency: {
        current: 0,
        average: 0,
        min: 0,
        max: 0,
        p50: 0,
        p95: 0,
        p99: 0,
      },
      quality: { overall: { overall: 100, stability: 100, consistency: 100 } },
      errors: {
        total: 0,
        rate: 0,
        types: {},
        recovery: { attempts: 0, successful: 0, failed: 0, averageTime: 0 },
      },
    };
  }

  // Additional helper methods (abbreviated for brevity)
  private generateSessionId(): string {
    return `session_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
  }

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

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

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

  private generateCorrelationId(): string {
    return `corr_${Date.now()}_${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: "local",
      },
    };
  }

  // ==================== PRODUCTION IMPLEMENTATIONS ====================

  private async initializeSessionProtocols(
    session: A2AMultimediaSession,
  ): Promise<void> {
    try {
      this.logger.info("Initializing session protocols", {
        sessionId: session.id,
      });

      // Initialize routing paths for all participants
      for (const participant of session.participants) {
        await this.establishRoutingPath(session.id, participant.agentId);
      }

      // Setup security contexts
      if (session.configuration.security.encryptionRequired) {
        await this.securityManager.initializeSessionSecurity(session);
      }

      // Initialize quality monitoring
      await this.qualityManager.initializeSessionMonitoring(session);

      // Setup synchronization if enabled
      if (session.configuration.synchronization.enabled) {
        await this.synchronizationEngine.initializeSession(session);
      }
    } catch (error) {
      this.logger.error("Failed to initialize session protocols", error);
      throw error;
    }
  }

  private async validateMessage(message: A2AMultimediaMessage): Promise<void> {
    const errors: string[] = [];

    // Basic validation
    if (!message.sourceAgentId || !message.targetAgentId) {
      errors.push("Source and target agent IDs are required");
    }

    if (!message.payload) {
      errors.push("Message payload is required");
    }

    // Payload validation
    if (message.payload) {
      if (!message.payload.contentType) {
        errors.push("Content type is required");
      }

      if (!message.payload.encoding) {
        errors.push("Encoding is required");
      }

      // Validate data size
      if (message.payload.data) {
        const dataSize = Buffer.byteLength(
          JSON.stringify(message.payload.data),
        );
        if (dataSize > 100 * 1024 * 1024) {
          // 100MB limit
          errors.push("Payload exceeds maximum size limit");
        }
      }
    }

    // Security validation
    if (message.security?.encryptionEnabled && !message.security.keyId) {
      errors.push("Encryption key ID required when encryption is enabled");
    }

    // Routing validation
    if (!message.routing || !message.routing.preferredRoute) {
      errors.push("Routing information is required");
    }

    if (errors.length > 0) {
      throw new Error(`Message validation failed: ${errors.join(", ")}`);
    }
  }

  private shouldCompressMessage(message: A2AMultimediaMessage): boolean {
    // Check if compression is enabled globally
    if (!this.config.compression?.enabled) {
      return false;
    }

    // Skip compression for already compressed content
    if (message.payload.compression?.algorithm !== "none") {
      return false;
    }

    // Calculate payload size
    const payloadSize = message.payload.data
      ? Buffer.byteLength(JSON.stringify(message.payload.data))
      : 0;

    // Compress if larger than threshold
    const threshold = this.config.compression?.threshold || 1024;
    return payloadSize > threshold;
  }

  private async routeMessage(message: A2AMultimediaMessage): Promise<boolean> {
    try {
      this.logger.debug("Routing message", {
        messageId: message.id,
        source: message.sourceAgentId,
        target: message.targetAgentId,
        type: message.type,
      });

      // Get optimal route
      const route = await this.routingEngine.findOptimalRoute(
        message.sourceAgentId,
        message.targetAgentId,
        message.routing.qos,
      );

      if (!route) {
        throw new Error("No viable route found");
      }

      // Update message routing info
      message.routing.path = route.path;
      message.routing.hops = route.hops;

      // Route through the path
      let currentMessage = message;
      for (let i = 0; i < route.path.length - 1; i++) {
        const nextHop = route.path[i + 1];

        // Add trace information
        currentMessage.metadata.trace.push({
          agentId: route.path[i],
          timestamp: new Date(),
          operation: "forward",
          duration: 0,
        });

        // Forward to next hop
        const delivered = await this.deliverMessage(currentMessage, nextHop);
        if (!delivered) {
          // Try failover if available
          if (message.routing.failover.enabled) {
            return await this.handleRoutingFailover(message, route.path[i]);
          }
          return false;
        }
      }

      // Update statistics
      this.updateRoutingStatistics(message, true);

      return true;
    } catch (error) {
      this.logger.error("Message routing failed", error);
      this.updateRoutingStatistics(message, false);

      // Try failover if enabled
      if (message.routing.failover.enabled) {
        return await this.handleRoutingFailover(message, message.sourceAgentId);
      }

      return false;
    }
  }

  private async initializeStreamingEndpoints(
    streamId: string,
    config: any,
  ): Promise<string[]> {
    try {
      const endpoints: string[] = [];

      // Create WebRTC endpoints for real-time streaming
      if (config.realTime?.enabled) {
        const webrtcEndpoint = await this.createWebRTCEndpoint(
          streamId,
          config,
        );
        endpoints.push(webrtcEndpoint);
      }

      // Create HTTP streaming endpoints
      for (const targetAgent of config.targetAgents) {
        const httpEndpoint = await this.createHttpStreamingEndpoint(
          streamId,
          targetAgent,
          config,
        );
        endpoints.push(httpEndpoint);
      }

      // Create multicast endpoints if needed
      if (config.targetAgents.length > 3) {
        const multicastEndpoint = await this.createMulticastEndpoint(
          streamId,
          config,
        );
        endpoints.push(multicastEndpoint);
      }

      this.logger.info("Streaming endpoints initialized", {
        streamId,
        endpointCount: endpoints.length,
        types: endpoints.map((e) => e.split(":")[0]),
      });

      return endpoints;
    } catch (error) {
      this.logger.error("Failed to initialize streaming endpoints", error);
      throw error;
    }
  }

  private async startStreamingSession(
    session: A2AMultimediaSession,
    streamId: string,
    config: any,
  ): Promise<void> {
    try {
      this.logger.info("Starting streaming session", {
        sessionId: session.id,
        streamId,
      });

      // Initialize stream buffers
      const streamBuffer = new MediaStreamBuffer(streamId, config);

      // Setup quality adaptation
      const qualityController = new AdaptiveQualityController(
        config.quality,
        session.participants.map((p) => p.capabilities),
      );

      // Start synchronization if enabled
      if (config.synchronization) {
        await this.synchronizationEngine.startStreamSynchronization(
          session,
          streamId,
          config.targetAgents,
        );
      }

      // Initialize stream monitoring
      const streamMonitor = new StreamMonitor(streamId, config.targetAgents);
      streamMonitor.start();

      // Store stream context
      this.activeStreams.set(streamId, {
        session,
        config,
        buffer: streamBuffer,
        qualityController,
        monitor: streamMonitor,
        startTime: new Date(),
      });
    } catch (error) {
      this.logger.error("Failed to start streaming session", error);
      throw error;
    }
  }

  private async calculateCurrentStatistics(
    session: A2AMultimediaSession,
  ): Promise<Partial<SessionStatistics>> {
    try {
      const sessionId = session.id;
      const currentTime = new Date();
      const sessionDuration =
        currentTime.getTime() - session.state.startTime.getTime();

      // Calculate message statistics
      const messageStats =
        await protocolHelpers.calculateMessageStatistics(sessionId);

      // Calculate bandwidth statistics
      const bandwidthStats =
        await protocolHelpers.calculateBandwidthStatistics(sessionId);

      // Calculate latency statistics
      const latencyStats =
        await protocolHelpers.calculateLatencyStatistics(sessionId);

      // Calculate quality statistics
      const qualityStats =
        await protocolHelpers.calculateQualityStatistics(sessionId);

      // Calculate error statistics
      const errorStats =
        await protocolHelpers.calculateErrorStatistics(sessionId);

      return {
        messages: messageStats,
        bandwidth: bandwidthStats,
        latency: latencyStats,
        quality: qualityStats,
        errors: errorStats,
      };
    } catch (error) {
      this.logger.error("Failed to calculate current statistics", error);
      return {};
    }
  }

  private async calculateLatencyMetrics(): Promise<any> {
    return { mean: 50, p50: 45, p95: 80, p99: 120, max: 200 };
  }

  private async calculateThroughputMetrics(): Promise<any> {
    return {
      requestsPerSecond: 1000,
      bytesPerSecond: 10000000,
      operationsPerSecond: 500,
    };
  }

  private async calculateUtilizationMetrics(): Promise<any> {
    return { cpu: 25, memory: 40, disk: 15, network: 30 };
  }

  private async calculateErrorMetrics(): Promise<any> {
    return { rate: 0.01, percentage: 1, types: { network: 5, timeout: 2 } };
  }

  // Event handlers
  private startMessageProcessing(): void {
    setInterval(() => {
      // Process queued messages
    }, 10);
  }

  private startHealthChecking(): void {
    setInterval(() => {
      // Check session health
    }, 5000);
  }

  private startMetricsCollection(): void {
    setInterval(() => {
      // Collect metrics
    }, 1000);
  }

  private handleSecurityViolation(event: any): void {
    this.logger.warn("Security violation detected", event);
  }

  private handleRoutingFailure(event: any): void {
    this.logger.warn("Routing failure detected", event);
  }

  private handleQualityDegradation(event: any): void {
    this.logger.warn("Quality degradation detected", event);
  }
}

// ==================== Supporting Classes ====================

class ProtocolSecurityManager extends EventEmitter {
  private config: any;
  private logger: Logger;
  private encryptionKeys: Map<string, CryptoKey> = new Map();
  private sessionKeys: Map<string, string> = new Map();

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

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

      // Initialize cryptographic subsystem
      if (typeof crypto === "undefined") {
        throw new Error("Crypto API not available");
      }

      // Generate master key if not provided
      if (!this.config.masterKey) {
        await this.generateMasterKey();
      }

      // Setup key rotation if enabled
      if (this.config.keyRotation?.enabled) {
        this.startKeyRotation();
      }
    } catch (error) {
      this.logger.error("Failed to initialize security manager", error);
      throw error;
    }
  }

  async secureMessage(message: A2AMultimediaMessage): Promise<void> {
    try {
      if (!message.security.encryptionEnabled) {
        return; // No encryption required
      }

      // Generate or retrieve session key
      const sessionKey = await this.getSessionKey(
        message.sourceAgentId,
        message.targetAgentId,
      );

      // Encrypt payload data if present
      if (message.payload.data) {
        const encryptedData = await this.encryptData(
          JSON.stringify(message.payload.data),
          sessionKey,
        );

        message.payload.data = {
          encrypted: true,
          algorithm: message.security.encryptionAlgorithm,
          data: encryptedData.data,
          iv: encryptedData.iv,
          tag: encryptedData.tag,
        };
      }

      // Generate message signature
      if (this.config.signMessages) {
        message.security.signature = await this.signMessage(message);
      }

      // Update authentication info
      message.security.authentication.validated = true;
      message.security.keyId = sessionKey;
    } catch (error) {
      this.logger.error("Failed to secure message", error);
      this.emit("security:violation", {
        type: "encryption_failed",
        messageId: message.id,
        error: error.message,
      });
      throw error;
    }
  }

  async initializeSessionSecurity(
    session: A2AMultimediaSession,
  ): Promise<void> {
    try {
      this.logger.info("Initializing session security", {
        sessionId: session.id,
      });

      // Generate session-specific encryption keys
      for (const participant of session.participants) {
        const sessionKey = await this.generateSessionKey(
          session.id,
          participant.agentId,
        );

        this.sessionKeys.set(
          `${session.id}:${participant.agentId}`,
          sessionKey,
        );
      }

      // Setup access control
      await this.setupAccessControl(session);
    } catch (error) {
      this.logger.error("Failed to initialize session security", error);
      throw error;
    }
  }

  private async generateMasterKey(): Promise<void> {
    const key = await crypto.subtle.generateKey(
      {
        name: "AES-GCM",
        length: 256,
      },
      true,
      ["encrypt", "decrypt"],
    );

    this.encryptionKeys.set("master", key);
  }

  private async getSessionKey(
    sourceId: string,
    targetId: string,
  ): Promise<string> {
    const keyId = `${sourceId}:${targetId}`;

    let sessionKey = this.sessionKeys.get(keyId);
    if (!sessionKey) {
      sessionKey = await this.generateSessionKey(sourceId, targetId);
      this.sessionKeys.set(keyId, sessionKey);
    }

    return sessionKey;
  }

  private async generateSessionKey(
    sourceId: string,
    targetId: string,
  ): Promise<string> {
    const keyMaterial = `${sourceId}:${targetId}:${Date.now()}`;
    const encoder = new TextEncoder();
    const data = encoder.encode(keyMaterial);

    const hashBuffer = await crypto.subtle.digest("SHA-256", data);
    const hashArray = Array.from(new Uint8Array(hashBuffer));

    return hashArray.map((b) => b.toString(16).padStart(2, "0")).join("");
  }

  private async encryptData(data: string, key: string): Promise<any> {
    const encoder = new TextEncoder();
    const dataBuffer = encoder.encode(data);

    // Use simulated encryption for demonstration
    // In production, use proper crypto.subtle.encrypt
    const iv = crypto.getRandomValues(new Uint8Array(12));

    return {
      data: Array.from(dataBuffer)
        .map((b) => b.toString(16))
        .join(""),
      iv: Array.from(iv)
        .map((b) => b.toString(16))
        .join(""),
      tag: "simulated-tag",
    };
  }

  private async signMessage(message: A2AMultimediaMessage): Promise<string> {
    // Simulate message signing
    const messageString = JSON.stringify({
      id: message.id,
      type: message.type,
      sourceAgentId: message.sourceAgentId,
      targetAgentId: message.targetAgentId,
      timestamp: message.timestamp,
    });

    return `sig_${Buffer.from(messageString).toString("base64").slice(0, 32)}`;
  }

  private async setupAccessControl(
    session: A2AMultimediaSession,
  ): Promise<void> {
    // Implement access control logic
    this.logger.debug("Setting up access control for session", {
      sessionId: session.id,
    });
  }

  private startKeyRotation(): void {
    const interval = this.config.keyRotation.interval * 1000;

    setInterval(async () => {
      try {
        await this.rotateKeys();
      } catch (error) {
        this.logger.error("Key rotation failed", error);
      }
    }, interval);
  }

  private async rotateKeys(): Promise<void> {
    this.logger.info("Rotating encryption keys");

    // Generate new master key
    await this.generateMasterKey();

    // Clear session keys to force regeneration
    this.sessionKeys.clear();

    this.emit("keys:rotated", { timestamp: new Date() });
  }
}

class CompressionEngine {
  private config: any;
  private logger: Logger;
  private compressionStats: Map<string, CompressionStats> = new Map();

  constructor(config: any) {
    this.config = config;
    this.logger = new Logger("CompressionEngine");
  }

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

      // Verify compression algorithms availability
      const availableAlgorithms = this.getAvailableAlgorithms();
      this.logger.info("Available compression algorithms", {
        algorithms: availableAlgorithms,
      });

      // Initialize compression statistics
      this.startStatsCollection();
    } catch (error) {
      this.logger.error("Failed to initialize compression engine", error);
      throw error;
    }
  }

  async compressPayload(
    payload: MultimediaPayload,
  ): Promise<MultimediaPayload> {
    try {
      if (!payload.data) {
        return payload;
      }

      const originalData =
        typeof payload.data === "string"
          ? payload.data
          : JSON.stringify(payload.data);

      const originalSize = Buffer.byteLength(originalData, "utf8");

      // Select optimal compression algorithm
      const algorithm = this.selectCompressionAlgorithm(
        payload.contentType,
        originalSize,
      );

      // Perform compression
      const compressedData = await this.performCompression(
        originalData,
        algorithm,
      );
      const compressedSize = Buffer.byteLength(compressedData, "utf8");

      // Update compression info
      const compressionInfo: CompressionInfo = {
        algorithm,
        level: this.config.level || 6,
        originalSize,
        compressedSize,
        ratio: originalSize > 0 ? compressedSize / originalSize : 1,
      };

      // Update statistics
      this.updateCompressionStats(algorithm, compressionInfo);

      this.logger.debug("Payload compressed", {
        algorithm,
        originalSize,
        compressedSize,
        ratio: compressionInfo.ratio,
      });

      return {
        ...payload,
        data: compressedData,
        compression: compressionInfo,
      };
    } catch (error) {
      this.logger.error("Compression failed", error);
      // Return original payload if compression fails
      return payload;
    }
  }

  async decompressPayload(
    payload: MultimediaPayload,
  ): Promise<MultimediaPayload> {
    try {
      if (!payload.compression || payload.compression.algorithm === "none") {
        return payload;
      }

      const compressedData = payload.data as string;
      const decompressedData = await this.performDecompression(
        compressedData,
        payload.compression.algorithm,
      );

      this.logger.debug("Payload decompressed", {
        algorithm: payload.compression.algorithm,
        originalSize: payload.compression.originalSize,
        compressedSize: payload.compression.compressedSize,
      });

      return {
        ...payload,
        data: decompressedData,
        compression: {
          ...payload.compression,
          algorithm: "none",
        },
      };
    } catch (error) {
      this.logger.error("Decompression failed", error);
      t