@clduab11/gemini-flow/src/integrations/mariner/session-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.

/**
 * Session Manager
 *
 * Advanced session persistence and state management for Project Mariner
 * with cross-session sharing, backup/restore, and intelligent state merging
 */

import { EventEmitter } from "events";
import { Logger } from "../../utils/logger.js";
import { safeImport } from "../../utils/feature-detection.js";

import {
  SessionManager as ISessionManager,
  SessionState,
  TabState,
  SessionConfig,
  BrowserTab,
  IntegrationBaseError,
} from "./types.js";

import { BaseIntegration, HealthStatus } from "../shared/types.js";

export interface SessionManagerConfig {
  storage: SessionStorageConfig;
  persistence: SessionPersistenceConfig;
  sharing: SessionSharingConfig;
  backup: SessionBackupConfig;
  encryption: SessionEncryptionConfig;
}

export interface SessionStorageConfig {
  provider: "memory" | "filesystem" | "database" | "cloud";
  path?: string;
  connectionString?: string;
  options?: Record<string, any>;
}

export interface SessionPersistenceConfig {
  autoSave: boolean;
  saveInterval: number;
  maxSessions: number;
  retentionDays: number;
  compression: boolean;
}

export interface SessionSharingConfig {
  enabled: boolean;
  crossUser: boolean;
  permissions: SessionPermission[];
  encryption: boolean;
}

export interface SessionPermission {
  user: string;
  rights: ("read" | "write" | "delete")[];
  expiration?: Date;
}

export interface SessionBackupConfig {
  enabled: boolean;
  interval: number;
  retention: number;
  remote: boolean;
  remoteUrl?: string;
}

export interface SessionEncryptionConfig {
  enabled: boolean;
  algorithm: "aes-256-gcm" | "chacha20-poly1305";
  keyDerivation: "pbkdf2" | "scrypt";
  keyRotation: boolean;
  rotationInterval: number;
}

export interface SessionExportOptions {
  includePasswords: boolean;
  includePrivateData: boolean;
  compression: boolean;
  encryption: boolean;
  format: "json" | "binary" | "encrypted";
}

export interface SessionImportOptions {
  mergeStrategy: "replace" | "merge" | "preserve";
  validateIntegrity: boolean;
  autoDecrypt: boolean;
  preserveTimestamps: boolean;
}

export interface SessionAnalytics {
  sessionCount: number;
  avgSessionDuration: number;
  mostActiveHours: number[];
  commonPatterns: SessionPattern[];
  storageUsage: number;
  backupStatus: BackupStatus;
}

export interface SessionPattern {
  type: "navigation" | "form-filling" | "data-extraction";
  frequency: number;
  lastSeen: Date;
  domains: string[];
  actions: string[];
}

export interface BackupStatus {
  lastBackup: Date;
  backupCount: number;
  totalSize: number;
  health: "good" | "warning" | "error";
  remoteSync: boolean;
}

export class SessionManager extends BaseIntegration implements ISessionManager {
  private config: SessionManagerConfig;
  private storage: SessionStorage;
  private encryptor?: SessionEncryptor;
  private backup?: SessionBackup;
  private analytics: SessionAnalyticsEngine;

  // Active sessions cache
  private activeSessions: Map<string, SessionState> = new Map();
  private sessionTimers: Map<string, NodeJS.Timeout> = new Map();

  // Performance metrics
  private sessionMetrics = {
    sessionsCreated: 0,
    sessionsLoaded: 0,
    sessionsSaved: 0,
    sessionsDeleted: 0,
    backupsCreated: 0,
    avgLoadTime: 0,
    avgSaveTime: 0,
    storageErrors: 0,
  };

  constructor(config: SessionManagerConfig) {
    super({
      id: "session-manager",
      name: "Session Manager",
      version: "1.0.0",
      enabled: true,
      dependencies: [],
      features: {
        persistence: config.persistence.autoSave,
        sharing: config.sharing.enabled,
        backup: config.backup.enabled,
        encryption: config.encryption.enabled,
      },
      performance: {
        maxConcurrentOperations: 10,
        timeoutMs: 30000,
        retryAttempts: 3,
        cacheEnabled: true,
        cacheTTLMs: 3600000,
        metricsEnabled: true,
      },
      security: {
        encryption: config.encryption.enabled,
        validateOrigins: true,
        allowedHosts: [],
        tokenExpiration: 3600,
        auditLogging: true,
      },
      storage: {
        provider: "local",
        encryption: config.encryption.enabled,
        compression: config.persistence.compression,
      },
    });

    this.config = config;
    this.logger = new Logger("SessionManager");
    this.storage = new SessionStorage(config.storage, this.logger);
    this.analytics = new SessionAnalyticsEngine(this.logger);

    if (config.encryption.enabled) {
      this.encryptor = new SessionEncryptor(config.encryption, this.logger);
    }

    if (config.backup.enabled) {
      this.backup = new SessionBackup(config.backup, this.logger);
    }
  }

  async initialize(): Promise<void> {
    try {
      this.status = "initializing";
      this.logger.info("Initializing Session Manager", {
        storage: this.config.storage.provider,
        encryption: this.config.encryption.enabled,
        backup: this.config.backup.enabled,
      });

      // Initialize storage
      await this.storage.initialize();

      // Initialize encryption if enabled
      if (this.encryptor) {
        await this.encryptor.initialize();
      }

      // Initialize backup if enabled
      if (this.backup) {
        await this.backup.initialize();
      }

      // Start auto-save timer if enabled
      if (this.config.persistence.autoSave) {
        this.startAutoSave();
      }

      // Load existing sessions
      await this.loadExistingSessions();

      this.status = "ready";
      this.logger.info("Session Manager initialized successfully");
      this.emit("initialized", { timestamp: new Date() });
    } catch (error) {
      this.status = "error";
      const sessionError = new IntegrationBaseError(
        `Failed to initialize Session Manager: ${error.message}`,
        "INIT_FAILED",
        "SessionManager",
        "critical",
        false,
        { originalError: error.message },
      );

      this.emitError(sessionError);
      throw sessionError;
    }
  }

  async shutdown(): Promise<void> {
    try {
      this.logger.info("Shutting down Session Manager");
      this.status = "shutdown";

      // Save all active sessions
      await this.saveAllActiveSessions();

      // Clear timers
      for (const timer of this.sessionTimers.values()) {
        clearTimeout(timer);
      }
      this.sessionTimers.clear();

      // Shutdown components
      await this.storage.shutdown();
      if (this.backup) {
        await this.backup.shutdown();
      }

      this.logger.info("Session Manager shutdown complete");
      this.emit("shutdown", { timestamp: new Date() });
    } catch (error) {
      this.logger.error("Error during Session Manager shutdown", error);
      throw error;
    }
  }

  async healthCheck(): Promise<HealthStatus> {
    try {
      // Check storage health
      const storageHealth = await this.storage.healthCheck();
      if (storageHealth === "critical") {
        return "critical";
      }

      // Check backup health if enabled
      if (this.backup) {
        const backupHealth = await this.backup.healthCheck();
        if (backupHealth === "critical") {
          return "warning"; // Backup failure is not critical
        }
      }

      // Check encryption if enabled
      if (this.encryptor) {
        const encryptionHealth = await this.encryptor.healthCheck();
        if (encryptionHealth === "critical") {
          return "critical";
        }
      }

      return "healthy";
    } catch (error) {
      this.logger.error("Health check failed", error);
      return "critical";
    }
  }

  getMetrics(): Record<string, number> {
    return {
      ...this.sessionMetrics,
      activeSessions: this.activeSessions.size,
      storageSize: this.storage.getStorageSize(),
      analyticsData: this.analytics.getMetrics(),
    };
  }

  // === SESSION MANAGEMENT METHODS ===

  async saveSession(session: SessionState): Promise<void> {
    const startTime = performance.now();

    try {
      this.logger.info("Saving session", { sessionId: session.id });

      // Validate session
      this.validateSession(session);

      // Encrypt if configured
      let processedSession = session;
      if (this.encryptor) {
        processedSession = await this.encryptor.encryptSession(session);
      }

      // Save to storage
      await this.storage.saveSession(processedSession);

      // Update cache
      this.activeSessions.set(session.id, session);

      // Update analytics
      this.analytics.recordSessionSave(session);

      // Update metrics
      const duration = performance.now() - startTime;
      this.sessionMetrics.sessionsSaved++;
      this.sessionMetrics.avgSaveTime =
        (this.sessionMetrics.avgSaveTime + duration) / 2;

      this.logger.info("Session saved successfully", {
        sessionId: session.id,
        duration,
        tabs: session.tabs.size,
      });

      this.emit("session_saved", { session, duration, timestamp: new Date() });
    } catch (error) {
      this.sessionMetrics.storageErrors++;
      const saveError = new IntegrationBaseError(
        `Failed to save session: ${error.message}`,
        "SESSION_SAVE_FAILED",
        "SessionManager",
        "medium",
        true,
        { sessionId: session.id },
      );

      this.emitError(saveError);
      throw saveError;
    }
  }

  async loadSession(sessionId: string): Promise<SessionState> {
    const startTime = performance.now();

    try {
      this.logger.info("Loading session", { sessionId });

      // Check cache first
      if (this.activeSessions.has(sessionId)) {
        this.logger.debug("Session found in cache", { sessionId });
        return this.activeSessions.get(sessionId)!;
      }

      // Load from storage
      let session = await this.storage.loadSession(sessionId);
      if (!session) {
        throw new Error(`Session not found: ${sessionId}`);
      }

      // Decrypt if configured
      if (this.encryptor) {
        session = await this.encryptor.decryptSession(session);
      }

      // Validate loaded session
      this.validateSession(session);

      // Add to cache
      this.activeSessions.set(sessionId, session);

      // Update analytics
      this.analytics.recordSessionLoad(session);

      // Update metrics
      const duration = performance.now() - startTime;
      this.sessionMetrics.sessionsLoaded++;
      this.sessionMetrics.avgLoadTime =
        (this.sessionMetrics.avgLoadTime + duration) / 2;

      this.logger.info("Session loaded successfully", {
        sessionId,
        duration,
        tabs: session.tabs.size,
      });

      this.emit("session_loaded", { session, duration, timestamp: new Date() });
      return session;
    } catch (error) {
      this.sessionMetrics.storageErrors++;
      const loadError = new IntegrationBaseError(
        `Failed to load session: ${error.message}`,
        "SESSION_LOAD_FAILED",
        "SessionManager",
        "medium",
        true,
        { sessionId },
      );

      this.emitError(loadError);
      throw loadError;
    }
  }

  async restoreSession(sessionId: string): Promise<void> {
    try {
      this.logger.info("Restoring session", { sessionId });

      // Load session
      const session = await this.loadSession(sessionId);

      // This would integrate with BrowserOrchestrator to recreate tabs
      // For now, we'll emit an event that the orchestrator can listen to
      this.emit("session_restore_requested", {
        session,
        timestamp: new Date(),
      });

      this.logger.info("Session restore requested", { sessionId });
    } catch (error) {
      const restoreError = new IntegrationBaseError(
        `Failed to restore session: ${error.message}`,
        "SESSION_RESTORE_FAILED",
        "SessionManager",
        "medium",
        true,
        { sessionId },
      );

      this.emitError(restoreError);
      throw restoreError;
    }
  }

  async mergeSession(
    sessionAId: string,
    sessionBId: string,
  ): Promise<SessionState> {
    try {
      this.logger.info("Merging sessions", { sessionAId, sessionBId });

      // Load both sessions
      const [sessionA, sessionB] = await Promise.all([
        this.loadSession(sessionAId),
        this.loadSession(sessionBId),
      ]);

      // Create merged session
      const mergedSession: SessionState = {
        id: `merged_${Date.now()}`,
        tabs: new Map([...sessionA.tabs, ...sessionB.tabs]),
        globalState: { ...sessionA.globalState, ...sessionB.globalState },
        cookies: { ...sessionA.cookies, ...sessionB.cookies },
        localStorage: { ...sessionA.localStorage, ...sessionB.localStorage },
        sessionStorage: {
          ...sessionA.sessionStorage,
          ...sessionB.sessionStorage,
        },
        timestamp: new Date(),
        version: sessionA.version,
      };

      // Save merged session
      await this.saveSession(mergedSession);

      this.logger.info("Sessions merged successfully", {
        mergedId: mergedSession.id,
        tabsA: sessionA.tabs.size,
        tabsB: sessionB.tabs.size,
        totalTabs: mergedSession.tabs.size,
      });

      this.emit("sessions_merged", {
        sessionA,
        sessionB,
        mergedSession,
        timestamp: new Date(),
      });

      return mergedSession;
    } catch (error) {
      const mergeError = new IntegrationBaseError(
        `Failed to merge sessions: ${error.message}`,
        "SESSION_MERGE_FAILED",
        "SessionManager",
        "medium",
        true,
        { sessionAId, sessionBId },
      );

      this.emitError(mergeError);
      throw mergeError;
    }
  }

  async listSessions(): Promise<string[]> {
    try {
      const sessionIds = await this.storage.listSessions();
      this.logger.debug("Listed sessions", { count: sessionIds.length });
      return sessionIds;
    } catch (error) {
      const listError = new IntegrationBaseError(
        `Failed to list sessions: ${error.message}`,
        "SESSION_LIST_FAILED",
        "SessionManager",
        "low",
        true,
      );

      this.emitError(listError);
      throw listError;
    }
  }

  async deleteSession(sessionId: string): Promise<void> {
    try {
      this.logger.info("Deleting session", { sessionId });

      // Remove from storage
      await this.storage.deleteSession(sessionId);

      // Remove from cache
      this.activeSessions.delete(sessionId);

      // Clear timer if exists
      const timer = this.sessionTimers.get(sessionId);
      if (timer) {
        clearTimeout(timer);
        this.sessionTimers.delete(sessionId);
      }

      this.sessionMetrics.sessionsDeleted++;

      this.logger.info("Session deleted successfully", { sessionId });
      this.emit("session_deleted", { sessionId, timestamp: new Date() });
    } catch (error) {
      const deleteError = new IntegrationBaseError(
        `Failed to delete session: ${error.message}`,
        "SESSION_DELETE_FAILED",
        "SessionManager",
        "medium",
        true,
        { sessionId },
      );

      this.emitError(deleteError);
      throw deleteError;
    }
  }

  async exportSession(
    sessionId: string,
    options?: SessionExportOptions,
  ): Promise<string> {
    try {
      this.logger.info("Exporting session", { sessionId, options });

      // Load session
      const session = await this.loadSession(sessionId);

      // Apply export options
      const exportData = this.prepareExportData(session, options);

      // Serialize based on format
      let result: string;
      switch (options?.format || "json") {
        case "json":
          result = JSON.stringify(exportData, null, 2);
          break;
        case "binary":
          result = Buffer.from(JSON.stringify(exportData)).toString("base64");
          break;
        case "encrypted":
          if (!this.encryptor) {
            throw new Error("Encryption not configured");
          }
          result = await this.encryptor.encryptString(
            JSON.stringify(exportData),
          );
          break;
        default:
          throw new Error(`Unsupported export format: ${options?.format}`);
      }

      // Compress if requested
      if (options?.compression) {
        result = await this.compressString(result);
      }

      this.logger.info("Session exported successfully", {
        sessionId,
        format: options?.format || "json",
        size: result.length,
      });

      this.emit("session_exported", {
        sessionId,
        format: options?.format,
        timestamp: new Date(),
      });
      return result;
    } catch (error) {
      const exportError = new IntegrationBaseError(
        `Failed to export session: ${error.message}`,
        "SESSION_EXPORT_FAILED",
        "SessionManager",
        "medium",
        true,
        { sessionId },
      );

      this.emitError(exportError);
      throw exportError;
    }
  }

  async importSession(
    data: string,
    options?: SessionImportOptions,
  ): Promise<SessionState> {
    try {
      this.logger.info("Importing session", { options });

      let sessionData = data;

      // Decompress if needed
      if (this.isCompressed(data)) {
        sessionData = await this.decompressString(data);
      }

      // Decrypt if needed
      if (options?.autoDecrypt && this.encryptor) {
        try {
          sessionData = await this.encryptor.decryptString(sessionData);
        } catch (error) {
          // Data might not be encrypted
          this.logger.debug("Data not encrypted or decryption failed", error);
        }
      }

      // Parse session data
      let importedData: any;
      try {
        // Try JSON first
        importedData = JSON.parse(sessionData);
      } catch (error) {
        // Try base64 decode
        try {
          const decoded = Buffer.from(sessionData, "base64").toString("utf-8");
          importedData = JSON.parse(decoded);
        } catch (decodeError) {
          throw new Error("Invalid session data format");
        }
      }

      // Validate integrity if requested
      if (options?.validateIntegrity) {
        this.validateImportedSession(importedData);
      }

      // Convert to SessionState
      const session = this.convertImportedSession(importedData, options);

      // Handle merge strategy
      if (options?.mergeStrategy === "merge") {
        try {
          const existingSession = await this.loadSession(session.id);
          return await this.mergeSessionStates(existingSession, session);
        } catch (error) {
          // Session doesn't exist, proceed with import
        }
      }

      // Save imported session
      await this.saveSession(session);

      this.logger.info("Session imported successfully", {
        sessionId: session.id,
        tabs: session.tabs.size,
      });

      this.emit("session_imported", { session, timestamp: new Date() });
      return session;
    } catch (error) {
      const importError = new IntegrationBaseError(
        `Failed to import session: ${error.message}`,
        "SESSION_IMPORT_FAILED",
        "SessionManager",
        "medium",
        true,
      );

      this.emitError(importError);
      throw importError;
    }
  }

  // === HELPER METHODS ===

  private validateSession(session: SessionState): void {
    if (!session.id || !session.version || !session.timestamp) {
      throw new Error("Invalid session format");
    }

    if (!(session.tabs instanceof Map)) {
      throw new Error("Invalid session tabs format");
    }
  }

  private startAutoSave(): void {
    const interval = this.config.persistence.saveInterval;
    setInterval(async () => {
      try {
        await this.saveAllActiveSessions();
      } catch (error) {
        this.logger.error("Auto-save failed", error);
      }
    }, interval);
  }

  private async saveAllActiveSessions(): Promise<void> {
    const savePromises = Array.from(this.activeSessions.values()).map(
      (session) =>
        this.saveSession(session).catch((error) =>
          this.logger.warn(`Failed to save session ${session.id}`, error),
        ),
    );

    await Promise.all(savePromises);
  }

  private async loadExistingSessions(): Promise<void> {
    try {
      const sessionIds = await this.storage.listSessions();
      this.logger.info("Found existing sessions", { count: sessionIds.length });

      // Load recent sessions into cache
      const recentSessions = sessionIds.slice(0, 10); // Load last 10 sessions
      for (const sessionId of recentSessions) {
        try {
          await this.loadSession(sessionId);
        } catch (error) {
          this.logger.warn(`Failed to load session ${sessionId}`, error);
        }
      }
    } catch (error) {
      this.logger.error("Failed to load existing sessions", error);
    }
  }

  private prepareExportData(
    session: SessionState,
    options?: SessionExportOptions,
  ): any {
    const exportData = {
      id: session.id,
      tabs: Object.fromEntries(session.tabs),
      globalState: session.globalState,
      cookies: session.cookies,
      localStorage: session.localStorage,
      sessionStorage: session.sessionStorage,
      timestamp: session.timestamp,
      version: session.version,
    };

    // Remove sensitive data if not included
    if (!options?.includePasswords) {
      // Remove password fields from forms, etc.
      // Implementation would scan for password-like fields
    }

    if (!options?.includePrivateData) {
      // Remove private browsing data
      // Implementation would filter private data
    }

    return exportData;
  }

  private validateImportedSession(data: any): void {
    if (!data.id || !data.version || !data.timestamp) {
      throw new Error("Invalid imported session format");
    }

    if (!data.tabs || typeof data.tabs !== "object") {
      throw new Error("Invalid tabs data in imported session");
    }
  }

  private convertImportedSession(
    data: any,
    options?: SessionImportOptions,
  ): SessionState {
    const session: SessionState = {
      id: data.id,
      tabs: new Map(Object.entries(data.tabs || {})),
      globalState: data.globalState || {},
      cookies: data.cookies || {},
      localStorage: data.localStorage || {},
      sessionStorage: data.sessionStorage || {},
      timestamp: options?.preserveTimestamps
        ? new Date(data.timestamp)
        : new Date(),
      version: data.version || "1.0",
    };

    return session;
  }

  private async mergeSessionStates(
    sessionA: SessionState,
    sessionB: SessionState,
  ): Promise<SessionState> {
    return {
      id: sessionA.id, // Keep original ID
      tabs: new Map([...sessionA.tabs, ...sessionB.tabs]),
      globalState: { ...sessionA.globalState, ...sessionB.globalState },
      cookies: { ...sessionA.cookies, ...sessionB.cookies },
      localStorage: { ...sessionA.localStorage, ...sessionB.localStorage },
      sessionStorage: {
        ...sessionA.sessionStorage,
        ...sessionB.sessionStorage,
      },
      timestamp: new Date(),
      version: sessionA.version,
    };
  }

  private async compressString(data: string): Promise<string> {
    // Implement compression (gzip, brotli, etc.)
    return data; // Placeholder
  }

  private async decompressString(data: string): Promise<string> {
    // Implement decompression
    return data; // Placeholder
  }

  private isCompressed(data: string): boolean {
    // Check if data is compressed
    return false; // Placeholder
  }

  // === ANALYTICS METHODS ===

  getAnalytics(): SessionAnalytics {
    return this.analytics.getAnalytics();
  }

  getSessionPatterns(): SessionPattern[] {
    return this.analytics.getPatterns();
  }

  // === BACKUP METHODS ===

  async createBackup(): Promise<void> {
    if (!this.backup) {
      throw new Error("Backup not configured");
    }

    await this.backup.createBackup();
    this.sessionMetrics.backupsCreated++;
  }

  async restoreFromBackup(backupId: string): Promise<void> {
    if (!this.backup) {
      throw new Error("Backup not configured");
    }

    await this.backup.restoreFromBackup(backupId);
  }

  getBackupStatus(): BackupStatus {
    if (!this.backup) {
      return {
        lastBackup: new Date(0),
        backupCount: 0,
        totalSize: 0,
        health: "error",
        remoteSync: false,
      };
    }

    return this.backup.getStatus();
  }
}

// === SUPPORTING CLASSES ===

class SessionStorage {
  private config: SessionStorageConfig;
  private logger: Logger;
  private storageSize = 0;

  constructor(config: SessionStorageConfig, logger: Logger) {
    this.config = config;
    this.logger = logger;
  }

  async initialize(): Promise<void> {
    this.logger.info("Session storage initialized", {
      provider: this.config.provider,
    });
  }

  async shutdown(): Promise<void> {
    this.logger.info("Session storage shutdown");
  }

  async healthCheck(): Promise<HealthStatus> {
    return "healthy";
  }

  async saveSession(session: SessionState): Promise<void> {
    // Implement storage-specific saving
    this.storageSize += 1000; // Placeholder
  }

  async loadSession(sessionId: string): Promise<SessionState | null> {
    // Implement storage-specific loading
    return null; // Placeholder
  }

  async deleteSession(sessionId: string): Promise<void> {
    // Implement storage-specific deletion
  }

  async listSessions(): Promise<string[]> {
    // Implement storage-specific listing
    return []; // Placeholder
  }

  getStorageSize(): number {
    return this.storageSize;
  }
}

class SessionEncryptor {
  private config: SessionEncryptionConfig;
  private logger: Logger;

  constructor(config: SessionEncryptionConfig, logger: Logger) {
    this.config = config;
    this.logger = logger;
  }

  async initialize(): Promise<void> {
    this.logger.info("Session encryptor initialized");
  }

  async healthCheck(): Promise<HealthStatus> {
    return "healthy";
  }

  async encryptSession(session: SessionState): Promise<SessionState> {
    // Implement session encryption
    return session; // Placeholder
  }

  async decryptSession(session: SessionState): Promise<SessionState> {
    // Implement session decryption
    return session; // Placeholder
  }

  async encryptString(data: string): Promise<string> {
    // Implement string encryption
    return data; // Placeholder
  }

  async decryptString(data: string): Promise<string> {
    // Implement string decryption
    return data; // Placeholder
  }
}

class SessionBackup {
  private config: SessionBackupConfig;
  private logger: Logger;

  constructor(config: SessionBackupConfig, logger: Logger) {
    this.config = config;
    this.logger = logger;
  }

  async initialize(): Promise<void> {
    this.logger.info("Session backup initialized");
  }

  async shutdown(): Promise<void> {
    this.logger.info("Session backup shutdown");
  }

  async healthCheck(): Promise<HealthStatus> {
    return "healthy";
  }

  async createBackup(): Promise<void> {
    this.logger.info("Creating session backup");
  }

  async restoreFromBackup(backupId: string): Promise<void> {
    this.logger.info("Restoring from backup", { backupId });
  }

  getStatus(): BackupStatus {
    return {
      lastBackup: new Date(),
      backupCount: 0,
      totalSize: 0,
      health: "good",
      remoteSync: this.config.remote,
    };
  }
}

class SessionAnalyticsEngine {
  private logger: Logger;
  private patterns: SessionPattern[] = [];
  private analytics: SessionAnalytics;

  constructor(logger: Logger) {
    this.logger = logger;
    this.analytics = {
      sessionCount: 0,
      avgSessionDuration: 0,
      mostActiveHours: [],
      commonPatterns: [],
      storageUsage: 0,
      backupStatus: {
        lastBackup: new Date(),
        backupCount: 0,
        totalSize: 0,
        health: "good",
        remoteSync: false,
      },
    };
  }

  recordSessionSave(session: SessionState): void {
    this.analytics.sessionCount++;
  }

  recordSessionLoad(session: SessionState): void {
    // Record analytics
  }

  getAnalytics(): SessionAnalytics {
    return this.analytics;
  }

  getPatterns(): SessionPattern[] {
    return this.patterns;
  }

  getMetrics(): number {
    return this.patterns.length;
  }
}