// Comprehensive secrets management system with lifecycle support
import { SecretsManagerClient, GetSecretValueCommand, CreateSecretCommand, UpdateSecretCommand, RotateSecretCommand } from "@aws-sdk/client-secrets-manager";
import { KMSClient, EncryptCommand, DecryptCommand, GenerateDataKeyCommand } from "@aws-sdk/client-kms";
import { CloudWatchLogsClient, PutLogEventsCommand } from "@aws-sdk/client-cloudwatch-logs";
import { randomBytes, createHash, createCipher, createDecipher } from 'crypto';

interface SecretMetadata {
  secretId: string;
  secretName: string;
  description: string;
  secretType: SecretType;
  rotationSchedule?: RotationSchedule;
  accessPolicy: AccessPolicy;
  encryptionKeyId: string;
  createdDate: Date;
  lastRotated?: Date;
  nextRotation?: Date;
  tags: Record<string, string>;
}

interface RotationSchedule {
  enabled: boolean;
  intervalDays: number;
  automaticRotation: boolean;
  rotationWindow: TimeWindow;
  failureNotification: NotificationConfig;
}

interface AccessPolicy {
  allowedServices: string[];
  allowedEnvironments: string[];
  allowedRoles: string[];
  accessPatterns: AccessPattern[];
  ipWhitelist?: string[];
}

interface AccessPattern {
  pattern: string;
  maxRequestsPerHour: number;
  allowedOperations: SecretOperation[];
}

enum SecretType {
  DATABASE_CREDENTIALS = 'DATABASE_CREDENTIALS',
  API_KEY = 'API_KEY',
  ENCRYPTION_KEY = 'ENCRYPTION_KEY',
  CERTIFICATE = 'CERTIFICATE',
  OAUTH_TOKEN = 'OAUTH_TOKEN',
  SYMMETRIC_KEY = 'SYMMETRIC_KEY'
}

enum SecretOperation {
  READ = 'READ',
  CREATE = 'CREATE',
  UPDATE = 'UPDATE',
  DELETE = 'DELETE',
  ROTATE = 'ROTATE'
}

export class CloudNativeSecretsManager {
  private secretsClient: SecretsManagerClient;
  private kmsClient: KMSClient;
  private auditLogger: CloudWatchLogsClient;
  private secretCache: Map<string, CachedSecret> = new Map();
  private rotationTasks: Map<string, NodeJS.Timeout> = new Map();

  constructor(region: string, private defaultKmsKeyId: string) {
    this.secretsClient = new SecretsManagerClient({ region });
    this.kmsClient = new KMSClient({ region });
    this.auditLogger = new CloudWatchLogsClient({ region });
    
    // Initialize automatic cleanup and rotation monitoring
    this.initializeBackgroundTasks();
  }

  async createSecret(metadata: Omit<SecretMetadata, 'secretId' | 'createdDate'>): Promise<string> {
    try {
      // Generate unique secret ID
      const secretId = this.generateSecretId(metadata.secretName);
      
      // Generate the actual secret value based on type
      const secretValue = await this.generateSecretValue(metadata.secretType);
      
      // Encrypt the secret value
      const encryptedValue = await this.encryptSecretValue(secretValue, metadata.encryptionKeyId || this.defaultKmsKeyId);
      
      // Create secret in AWS Secrets Manager
      const createCommand = new CreateSecretCommand({
        Name: secretId,
        Description: metadata.description,
        SecretString: JSON.stringify(encryptedValue),
        KmsKeyId: metadata.encryptionKeyId || this.defaultKmsKeyId,
        ReplicationRegions: await this.getReplicationRegions(),
        Tags: this.formatTags(metadata.tags)
      });

      const result = await this.secretsClient.send(createCommand);
      
      // Store metadata
      const fullMetadata: SecretMetadata = {
        ...metadata,
        secretId,
        createdDate: new Date()
      };
      
      await this.storeSecretMetadata(secretId, fullMetadata);
      
      // Schedule rotation if enabled
      if (metadata.rotationSchedule?.enabled) {
        await this.scheduleRotation(secretId, metadata.rotationSchedule);
      }
      
      // Log creation event
      await this.auditSecretOperation(secretId, SecretOperation.CREATE, {
        userId: 'system',
        operation: 'create_secret',
        metadata: { secretType: metadata.secretType, hasRotation: !!metadata.rotationSchedule?.enabled }
      });
      
      return secretId;
      
    } catch (error) {
      throw new Error(`Failed to create secret: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }

  async getSecret(secretId: string, requestContext: SecretRequestContext): Promise<SecretValue> {
    try {
      // Validate access
      await this.validateAccess(secretId, requestContext, SecretOperation.READ);
      
      // Check cache first
      const cached = this.getCachedSecret(secretId);
      if (cached && !this.isCacheExpired(cached)) {
        await this.auditSecretOperation(secretId, SecretOperation.READ, {
          userId: requestContext.userId,
          operation: 'get_secret_cached',
          metadata: { cacheHit: true }
        });
        return cached.value;
      }
      
      // Retrieve from AWS Secrets Manager
      const getCommand = new GetSecretValueCommand({
        SecretId: secretId,
        VersionStage: 'AWSCURRENT'
      });
      
      const result = await this.secretsClient.send(getCommand);
      
      if (!result.SecretString) {
        throw new Error('Secret value not found');
      }
      
      // Decrypt the secret value
      const encryptedValue = JSON.parse(result.SecretString);
      const decryptedValue = await this.decryptSecretValue(encryptedValue);
      
      // Cache the secret for performance
      this.cacheSecret(secretId, decryptedValue, requestContext);
      
      // Log access event
      await this.auditSecretOperation(secretId, SecretOperation.READ, {
        userId: requestContext.userId,
        operation: 'get_secret',
        metadata: { 
          sourceIP: requestContext.sourceIP,
          userAgent: requestContext.userAgent,
          cacheHit: false
        }
      });
      
      return decryptedValue;
      
    } catch (error) {
      await this.auditSecretOperation(secretId, SecretOperation.READ, {
        userId: requestContext.userId,
        operation: 'get_secret_failed',
        metadata: { error: error instanceof Error ? error.message : 'Unknown error' }
      });
      throw new Error(`Failed to retrieve secret: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }

  async rotateSecret(secretId: string, options: RotationOptions = {}): Promise<RotationResult> {
    try {
      const metadata = await this.getSecretMetadata(secretId);
      if (!metadata) {
        throw new Error('Secret metadata not found');
      }
      
      // Pre-rotation validation
      await this.validateRotationEligibility(secretId, metadata);
      
      // Generate new secret value
      const newSecretValue = await this.generateSecretValue(metadata.secretType);
      
      // For database credentials, test connectivity before rotation
      if (metadata.secretType === SecretType.DATABASE_CREDENTIALS) {
        await this.validateDatabaseConnectivity(newSecretValue);
      }
      
      // Encrypt new value
      const encryptedNewValue = await this.encryptSecretValue(newSecretValue, metadata.encryptionKeyId);
      
      // Initiate rotation in AWS Secrets Manager
      const rotateCommand = new RotateSecretCommand({
        SecretId: secretId,
        ForceRotateSecretOnUpdate: true,
        RotationRules: {
          AutomaticallyAfterDays: metadata.rotationSchedule?.intervalDays || 30
        }
      });
      
      const rotationResult = await this.secretsClient.send(rotateCommand);
      
      // Update metadata
      metadata.lastRotated = new Date();
      metadata.nextRotation = new Date(Date.now() + (metadata.rotationSchedule?.intervalDays || 30) * 24 * 60 * 60 * 1000);
      await this.storeSecretMetadata(secretId, metadata);
      
      // Invalidate cache
      this.invalidateSecretCache(secretId);
      
      // Notify dependent services if configured
      if (options.notifyDependentServices !== false) {
        await this.notifyDependentServices(secretId, metadata);
      }
      
      // Log rotation event
      await this.auditSecretOperation(secretId, SecretOperation.ROTATE, {
        userId: options.initiatedBy || 'system',
        operation: 'rotate_secret',
        metadata: { 
          automatic: options.automatic || false,
          versionId: rotationResult.VersionId
        }
      });
      
      return {
        success: true,
        newVersionId: rotationResult.VersionId,
        rotatedAt: new Date(),
        nextRotation: metadata.nextRotation
      };
      
    } catch (error) {
      await this.auditSecretOperation(secretId, SecretOperation.ROTATE, {
        userId: options.initiatedBy || 'system',
        operation: 'rotate_secret_failed',
        metadata: { error: error instanceof Error ? error.message : 'Unknown error' }
      });
      
      return {
        success: false,
        error: error instanceof Error ? error.message : 'Unknown error',
        rotatedAt: new Date()
      };
    }
  }

  private async generateSecretValue(secretType: SecretType): Promise<SecretValue> {
    switch (secretType) {
      case SecretType.DATABASE_CREDENTIALS:
        return this.generateDatabaseCredentials();
      
      case SecretType.API_KEY:
        return this.generateApiKey();
      
      case SecretType.ENCRYPTION_KEY:
        return await this.generateEncryptionKey();
      
      case SecretType.SYMMETRIC_KEY:
        return this.generateSymmetricKey();
      
      case SecretType.CERTIFICATE:
        return await this.generateCertificate();
      
      default:
        return this.generateGenericSecret();
    }
  }

  private generateDatabaseCredentials(): SecretValue {
    const password = this.generateStrongPassword(32);
    return {
      type: SecretType.DATABASE_CREDENTIALS,
      value: {
        username: `app_user_${this.generateRandomString(8)}`,
        password: password,
        engine: 'postgres', // This would be configurable
        host: process.env.DB_HOST,
        port: 5432,
        dbname: process.env.DB_NAME
      },
      metadata: {
        passwordComplexity: 'high',
        generatedAt: new Date().toISOString()
      }
    };
  }

  private generateApiKey(): SecretValue {
    const keyPrefix = 'ak_';
    const keyBody = this.generateRandomString(32, 'base62');
    const checksum = createHash('sha256').update(keyBody).digest('hex').substring(0, 8);
    
    return {
      type: SecretType.API_KEY,
      value: `${keyPrefix}${keyBody}_${checksum}`,
      metadata: {
        keyFormat: 'prefixed_with_checksum',
        generatedAt: new Date().toISOString()
      }
    };
  }

  private async generateEncryptionKey(): Promise<SecretValue> {
    // Generate a 256-bit encryption key using AWS KMS
    const command = new GenerateDataKeyCommand({
      KeyId: this.defaultKmsKeyId,
      KeySpec: 'AES_256'
    });
    
    const result = await this.kmsClient.send(command);
    
    return {
      type: SecretType.ENCRYPTION_KEY,
      value: {
        keyMaterial: result.Plaintext ? Buffer.from(result.Plaintext).toString('base64') : '',
        encryptedKey: result.CiphertextBlob ? Buffer.from(result.CiphertextBlob).toString('base64') : '',
        keyId: this.defaultKmsKeyId
      },
      metadata: {
        keyLength: '256',
        algorithm: 'AES',
        generatedAt: new Date().toISOString()
      }
    };
  }

  private generateSymmetricKey(): SecretValue {
    const keyBytes = randomBytes(32); // 256-bit key
    return {
      type: SecretType.SYMMETRIC_KEY,
      value: keyBytes.toString('base64'),
      metadata: {
        keyLength: '256',
        encoding: 'base64',
        generatedAt: new Date().toISOString()
      }
    };
  }

  private generateStrongPassword(length: number): string {
    const charset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()_+-=[]{}|;:,.<>?';
    let password = '';
    
    // Ensure at least one character from each required category
    const categories = [
      'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
      'abcdefghijklmnopqrstuvwxyz',
      '0123456789',
      '!@#$%^&*()_+-=[]{}|;:,.<>?'
    ];
    
    // Add one character from each category
    for (const category of categories) {
      password += category[Math.floor(Math.random() * category.length)];
    }
    
    // Fill remaining length with random characters
    for (let i = password.length; i < length; i++) {
      password += charset[Math.floor(Math.random() * charset.length)];
    }
    
    // Shuffle the password to avoid predictable patterns
    return password.split('').sort(() => Math.random() - 0.5).join('');
  }

  private generateRandomString(length: number, charset: string = 'base64'): string {
    const charsets = {
      base64: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
      base62: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789',
      hex: '0123456789abcdef'
    };
    
    const chars = charsets[charset as keyof typeof charsets] || charsets.base64;
    const bytes = randomBytes(length);
    let result = '';
    
    for (let i = 0; i < length; i++) {
      result += chars[bytes[i] % chars.length];
    }
    
    return result;
  }

  private async validateAccess(secretId: string, context: SecretRequestContext, operation: SecretOperation): Promise<void> {
    const metadata = await this.getSecretMetadata(secretId);
    if (!metadata) {
      throw new Error('Secret not found');
    }
    
    // Check service authorization
    if (!metadata.accessPolicy.allowedServices.includes(context.serviceId)) {
      throw new Error('Service not authorized to access this secret');
    }
    
    // Check environment authorization
    if (!metadata.accessPolicy.allowedEnvironments.includes(context.environment)) {
      throw new Error('Environment not authorized for this secret');
    }
    
    // Check operation authorization
    const allowedOps = metadata.accessPolicy.accessPatterns
      .filter(pattern => new RegExp(pattern.pattern).test(context.requestPath))
      .flatMap(pattern => pattern.allowedOperations);
    
    if (!allowedOps.includes(operation)) {
      throw new Error('Operation not allowed by access policy');
    }
    
    // Check rate limits
    await this.checkRateLimit(secretId, context);
    
    // Check IP whitelist if configured
    if (metadata.accessPolicy.ipWhitelist && metadata.accessPolicy.ipWhitelist.length > 0) {
      if (!metadata.accessPolicy.ipWhitelist.includes(context.sourceIP)) {
        throw new Error('IP address not in whitelist');
      }
    }
  }

  private async scheduleRotation(secretId: string, schedule: RotationSchedule): Promise<void> {
    if (!schedule.enabled || !schedule.automaticRotation) {
      return;
    }
    
    const intervalMs = schedule.intervalDays * 24 * 60 * 60 * 1000;
    
    const timeout = setTimeout(async () => {
      try {
        await this.rotateSecret(secretId, { automatic: true, initiatedBy: 'system' });
        // Reschedule for next interval
        await this.scheduleRotation(secretId, schedule);
      } catch (error) {
        console.error(`Automatic rotation failed for secret ${secretId}:`, error);
        // Implement notification logic here
      }
    }, intervalMs);
    
    this.rotationTasks.set(secretId, timeout);
  }

  private initializeBackgroundTasks(): void {
    // Clean up expired cache entries every 5 minutes
    setInterval(() => {
      this.cleanupExpiredCache();
    }, 5 * 60 * 1000);
    
    // Check for missed rotations every hour
    setInterval(() => {
      this.checkMissedRotations();
    }, 60 * 60 * 1000);
  }

  private cleanupExpiredCache(): void {
    const now = Date.now();
    for (const [secretId, cached] of this.secretCache.entries()) {
      if (now > cached.expiresAt) {
        this.secretCache.delete(secretId);
      }
    }
  }

  private async checkMissedRotations(): Promise<void> {
    // This would query the metadata store for secrets with missed rotation schedules
    // Implementation would depend on your metadata storage solution
  }

  async getSecretUsageMetrics(secretId: string, timeRange: TimeRange): Promise<UsageMetrics> {
    // Implementation would query audit logs to generate usage metrics
    return {
      totalAccesses: 0,
      uniqueServices: 0,
      averageRequestsPerHour: 0,
      peakUsageTime: new Date(),
      accessPatterns: []
    };
  }

  async revokeSecret(secretId: string, reason: string): Promise<void> {
    try {
      // Mark secret as revoked in metadata
      const metadata = await this.getSecretMetadata(secretId);
      if (metadata) {
        metadata.tags['status'] = 'revoked';
        metadata.tags['revokedAt'] = new Date().toISOString();
        metadata.tags['revokeReason'] = reason;
        await this.storeSecretMetadata(secretId, metadata);
      }
      
      // Cancel any scheduled rotations
      const rotationTask = this.rotationTasks.get(secretId);
      if (rotationTask) {
        clearTimeout(rotationTask);
        this.rotationTasks.delete(secretId);
      }
      
      // Invalidate cache
      this.invalidateSecretCache(secretId);
      
      // Log revocation
      await this.auditSecretOperation(secretId, SecretOperation.DELETE, {
        userId: 'system',
        operation: 'revoke_secret',
        metadata: { reason }
      });
      
    } catch (error) {
      throw new Error(`Failed to revoke secret: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }
}

// Dynamic secret injection system for cloud-native workloads
import { ECSClient, DescribeTasksCommand, DescribeTaskDefinitionCommand } from "@aws-sdk/client-ecs";
import { LambdaClient, GetFunctionCommand, UpdateFunctionConfigurationCommand } from "@aws-sdk/client-lambda";
import { SSMClient, GetParametersCommand, PutParameterCommand } from "@aws-sdk/client-ssm";

interface SecretInjectionConfig {
  injectionMethod: InjectionMethod;
  targetWorkload: WorkloadTarget;
  secretMappings: SecretMapping[];
  refreshPolicy: RefreshPolicy;
  failureHandling: FailureHandlingPolicy;
}

interface SecretMapping {
  secretId: string;
  targetKey: string;
  transformationRule?: TransformationRule;
  validationRule?: ValidationRule;
}

interface RefreshPolicy {
  automaticRefresh: boolean;
  refreshInterval: number; // minutes
  refreshTriggers: RefreshTrigger[];
  gracefulFailover: boolean;
}

enum InjectionMethod {
  ENVIRONMENT_VARIABLE = 'ENVIRONMENT_VARIABLE',
  MOUNTED_FILE = 'MOUNTED_FILE',
  IN_MEMORY_CACHE = 'IN_MEMORY_CACHE',
  INIT_CONTAINER = 'INIT_CONTAINER',
  SIDECAR_PROXY = 'SIDECAR_PROXY'
}

enum RefreshTrigger {
  SECRET_ROTATION = 'SECRET_ROTATION',
  SCHEDULE = 'SCHEDULE',
  MANUAL = 'MANUAL',
  HEALTH_CHECK_FAILURE = 'HEALTH_CHECK_FAILURE'
}

export class DynamicSecretInjector {
  private ecsClient: ECSClient;
  private lambdaClient: LambdaClient;
  private ssmClient: SSMClient;
  private secretsManager: CloudNativeSecretsManager;
  private injectionJobs: Map<string, InjectionJob> = new Map();

  constructor(
    region: string,
    secretsManager: CloudNativeSecretsManager
  ) {
    this.ecsClient = new ECSClient({ region });
    this.lambdaClient = new LambdaClient({ region });
    this.ssmClient = new SSMClient({ region });
    this.secretsManager = secretsManager;
    
    this.initializeRefreshScheduler();
  }

  async injectSecrets(config: SecretInjectionConfig): Promise<InjectionResult> {
    try {
      // Validate configuration
      await this.validateInjectionConfig(config);
      
      // Retrieve all required secrets
      const secretValues = await this.retrieveSecretsForInjection(config.secretMappings);
      
      // Apply transformations
      const transformedSecrets = await this.applyTransformations(secretValues, config.secretMappings);
      
      // Inject based on method
      const injectionResult = await this.performInjection(config, transformedSecrets);
      
      // Set up refresh monitoring if enabled
      if (config.refreshPolicy.automaticRefresh) {
        await this.setupRefreshMonitoring(config, injectionResult.jobId);
      }
      
      return injectionResult;
      
    } catch (error) {
      throw new Error(`Secret injection failed: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }

  private async performInjection(config: SecretInjectionConfig, secrets: ProcessedSecret[]): Promise<InjectionResult> {
    switch (config.injectionMethod) {
      case InjectionMethod.ENVIRONMENT_VARIABLE:
        return await this.injectAsEnvironmentVariables(config, secrets);
      
      case InjectionMethod.MOUNTED_FILE:
        return await this.injectAsMountedFiles(config, secrets);
      
      case InjectionMethod.IN_MEMORY_CACHE:
        return await this.injectToMemoryCache(config, secrets);
      
      case InjectionMethod.INIT_CONTAINER:
        return await this.injectViaInitContainer(config, secrets);
      
      case InjectionMethod.SIDECAR_PROXY:
        return await this.injectViaSidecarProxy(config, secrets);
      
      default:
        throw new Error(`Unsupported injection method: ${config.injectionMethod}`);
    }
  }

  private async injectAsEnvironmentVariables(config: SecretInjectionConfig, secrets: ProcessedSecret[]): Promise<InjectionResult> {
    const jobId = this.generateJobId();
    
    try {
      if (config.targetWorkload.type === 'ECS_TASK') {
        return await this.injectToECSTask(config, secrets, jobId);
      } else if (config.targetWorkload.type === 'LAMBDA_FUNCTION') {
        return await this.injectToLambdaFunction(config, secrets, jobId);
      } else {
        throw new Error(`Unsupported workload type for environment variable injection: ${config.targetWorkload.type}`);
      }
    } catch (error) {
      throw new Error(`Environment variable injection failed: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }

  private async injectToECSTask(config: SecretInjectionConfig, secrets: ProcessedSecret[], jobId: string): Promise<InjectionResult> {
    // For ECS, we update the task definition with secrets from AWS Systems Manager Parameter Store
    const parameterPromises = secrets.map(async (secret) => {
      const parameterName = `/secrets/${config.targetWorkload.identifier}/${secret.targetKey}`;
      
      await this.ssmClient.send(new PutParameterCommand({
        Name: parameterName,
        Value: typeof secret.value === 'string' ? secret.value : JSON.stringify(secret.value),
        Type: 'SecureString',
        Overwrite: true,
        Description: `Secret for ${config.targetWorkload.identifier}`,
        Tags: [
          { Key: 'InjectionJob', Value: jobId },
          { Key: 'TargetWorkload', Value: config.targetWorkload.identifier },
          { Key: 'ManagedBy', Value: 'DynamicSecretInjector' }
        ]
      }));
      
      return {
        name: secret.targetKey,
        valueFrom: parameterName
      };
    });
    
    const parameterReferences = await Promise.all(parameterPromises);
    
    // Create injection job record
    const injectionJob: InjectionJob = {
      jobId,
      config,
      createdAt: new Date(),
      status: 'ACTIVE',
      parameterReferences,
      lastRefresh: new Date()
    };
    
    this.injectionJobs.set(jobId, injectionJob);
    
    return {
      jobId,
      status: 'SUCCESS',
      injectionMethod: config.injectionMethod,
      secretCount: secrets.length,
      targetWorkload: config.targetWorkload.identifier,
      parameterReferences
    };
  }

  private async injectToLambdaFunction(config: SecretInjectionConfig, secrets: ProcessedSecret[], jobId: string): Promise<InjectionResult> {
    const functionName = config.targetWorkload.identifier;
    
    // Get current function configuration
    const getFunctionResult = await this.lambdaClient.send(new GetFunctionCommand({
      FunctionName: functionName
    }));
    
    const currentEnvironment = getFunctionResult.Configuration?.Environment?.Variables || {};
    
    // Add secrets to environment variables
    const updatedEnvironment = { ...currentEnvironment };
    
    for (const secret of secrets) {
      updatedEnvironment[secret.targetKey] = typeof secret.value === 'string' ? secret.value : JSON.stringify(secret.value);
    }
    
    // Update function configuration
    await this.lambdaClient.send(new UpdateFunctionConfigurationCommand({
      FunctionName: functionName,
      Environment: {
        Variables: updatedEnvironment
      }
    }));
    
    // Create injection job record
    const injectionJob: InjectionJob = {
      jobId,
      config,
      createdAt: new Date(),
      status: 'ACTIVE',
      environmentVariables: secrets.map(s => s.targetKey),
      lastRefresh: new Date()
    };
    
    this.injectionJobs.set(jobId, injectionJob);
    
    return {
      jobId,
      status: 'SUCCESS',
      injectionMethod: config.injectionMethod,
      secretCount: secrets.length,
      targetWorkload: config.targetWorkload.identifier,
      environmentVariables: secrets.map(s => s.targetKey)
    };
  }

  private async injectAsMountedFiles(config: SecretInjectionConfig, secrets: ProcessedSecret[]): Promise<InjectionResult> {
    // This would integrate with Kubernetes secrets or EFS/FSx for file-based injection
    const jobId = this.generateJobId();
    
    // Create temporary directory structure
    const secretsPath = `/tmp/secrets/${jobId}`;
    
    // For each secret, create a file
    const filePromises = secrets.map(async (secret) => {
      const filePath = `${secretsPath}/${secret.targetKey}`;
      const fileContent = typeof secret.value === 'string' ? secret.value : JSON.stringify(secret.value, null, 2);
      
      // In a real implementation, this would write to a shared volume or mounted filesystem
      // For demonstration, we'll simulate the file creation
      return {
        path: filePath,
        size: Buffer.byteLength(fileContent, 'utf8'),
        permissions: '600' // Read-write for owner only
      };
    });
    
    const files = await Promise.all(filePromises);
    
    const injectionJob: InjectionJob = {
      jobId,
      config,
      createdAt: new Date(),
      status: 'ACTIVE',
      mountedFiles: files,
      lastRefresh: new Date()
    };
    
    this.injectionJobs.set(jobId, injectionJob);
    
    return {
      jobId,
      status: 'SUCCESS',
      injectionMethod: config.injectionMethod,
      secretCount: secrets.length,
      targetWorkload: config.targetWorkload.identifier,
      mountPath: secretsPath,
      files
    };
  }

  private async injectViaSidecarProxy(config: SecretInjectionConfig, secrets: ProcessedSecret[]): Promise<InjectionResult> {
    const jobId = this.generateJobId();
    
    // Create a sidecar proxy configuration that serves secrets via HTTP API
    const proxyConfig = {
      port: 8080,
      endpoints: secrets.map(secret => ({
        path: `/secrets/${secret.targetKey}`,
        method: 'GET',
        auth: 'bearer_token',
        response: secret.value
      })),
      healthCheck: '/health',
      metrics: '/metrics'
    };
    
    // In a real implementation, this would deploy a sidecar container
    // that provides an API for accessing secrets
    
    const injectionJob: InjectionJob = {
      jobId,
      config,
      createdAt: new Date(),
      status: 'ACTIVE',
      sidecarConfig: proxyConfig,
      lastRefresh: new Date()
    };
    
    this.injectionJobs.set(jobId, injectionJob);
    
    return {
      jobId,
      status: 'SUCCESS',
      injectionMethod: config.injectionMethod,
      secretCount: secrets.length,
      targetWorkload: config.targetWorkload.identifier,
      sidecarEndpoint: `http://localhost:${proxyConfig.port}`
    };
  }

  async refreshSecrets(jobId: string): Promise<RefreshResult> {
    const job = this.injectionJobs.get(jobId);
    if (!job) {
      throw new Error(`Injection job ${jobId} not found`);
    }
    
    try {
      // Retrieve updated secrets
      const updatedSecrets = await this.retrieveSecretsForInjection(job.config.secretMappings);
      const transformedSecrets = await this.applyTransformations(updatedSecrets, job.config.secretMappings);
      
      // Perform refresh based on injection method
      const refreshResult = await this.performRefresh(job, transformedSecrets);
      
      // Update job record
      job.lastRefresh = new Date();
      job.refreshCount = (job.refreshCount || 0) + 1;
      
      return refreshResult;
      
    } catch (error) {
      job.lastError = error instanceof Error ? error.message : 'Unknown error';
      job.status = 'ERROR';
      
      throw new Error(`Secret refresh failed: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }

  private async performRefresh(job: InjectionJob, secrets: ProcessedSecret[]): Promise<RefreshResult> {
    switch (job.config.injectionMethod) {
      case InjectionMethod.ENVIRONMENT_VARIABLE:
        return await this.refreshEnvironmentVariables(job, secrets);
      
      case InjectionMethod.MOUNTED_FILE:
        return await this.refreshMountedFiles(job, secrets);
      
      case InjectionMethod.SIDECAR_PROXY:
        return await this.refreshSidecarProxy(job, secrets);
      
      default:
        throw new Error(`Refresh not supported for injection method: ${job.config.injectionMethod}`);
    }
  }

  private async refreshEnvironmentVariables(job: InjectionJob, secrets: ProcessedSecret[]): Promise<RefreshResult> {
    if (job.config.targetWorkload.type === 'LAMBDA_FUNCTION') {
      // For Lambda, we need to update the function configuration
      const result = await this.injectToLambdaFunction(job.config, secrets, job.jobId);
      return {
        success: true,
        updatedSecrets: secrets.length,
        method: 'environment_variable_update',
        timestamp: new Date()
      };
    } else {
      // For ECS, update the parameter store values
      for (const secret of secrets) {
        const parameterName = `/secrets/${job.config.targetWorkload.identifier}/${secret.targetKey}`;
        await this.ssmClient.send(new PutParameterCommand({
          Name: parameterName,
          Value: typeof secret.value === 'string' ? secret.value : JSON.stringify(secret.value),
          Type: 'SecureString',
          Overwrite: true
        }));
      }
      
      return {
        success: true,
        updatedSecrets: secrets.length,
        method: 'parameter_store_update',
        timestamp: new Date()
      };
    }
  }

  private initializeRefreshScheduler(): void {
    // Check for jobs that need refresh every minute
    setInterval(async () => {
      const now = new Date();
      
      for (const [jobId, job] of this.injectionJobs.entries()) {
        if (!job.config.refreshPolicy.automaticRefresh) {
          continue;
        }
        
        const minutesSinceLastRefresh = (now.getTime() - job.lastRefresh.getTime()) / (1000 * 60);
        
        if (minutesSinceLastRefresh >= job.config.refreshPolicy.refreshInterval) {
          try {
            await this.refreshSecrets(jobId);
          } catch (error) {
            console.error(`Scheduled refresh failed for job ${jobId}:`, error);
          }
        }
      }
    }, 60 * 1000); // Every minute
  }

  async revokeInjection(jobId: string): Promise<void> {
    const job = this.injectionJobs.get(jobId);
    if (!job) {
      throw new Error(`Injection job ${jobId} not found`);
    }
    
    try {
      // Clean up based on injection method
      switch (job.config.injectionMethod) {
        case InjectionMethod.ENVIRONMENT_VARIABLE:
          await this.cleanupEnvironmentVariables(job);
          break;
        
        case InjectionMethod.MOUNTED_FILE:
          await this.cleanupMountedFiles(job);
          break;
        
        case InjectionMethod.SIDECAR_PROXY:
          await this.cleanupSidecarProxy(job);
          break;
      }
      
      // Remove job record
      this.injectionJobs.delete(jobId);
      
    } catch (error) {
      throw new Error(`Failed to revoke injection: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }

  async getInjectionStatus(jobId: string): Promise<InjectionStatus> {
    const job = this.injectionJobs.get(jobId);
    if (!job) {
      return {
        jobId,
        status: 'NOT_FOUND',
        error: 'Job not found'
      };
    }
    
    return {
      jobId,
      status: job.status,
      createdAt: job.createdAt,
      lastRefresh: job.lastRefresh,
      refreshCount: job.refreshCount || 0,
      secretCount: job.config.secretMappings.length,
      method: job.config.injectionMethod,
      targetWorkload: job.config.targetWorkload.identifier,
      error: job.lastError
    };
  }
}

// Zero-trust secret distribution system
interface ZeroTrustContext {
  identity: VerifiedIdentity;
  networkContext: NetworkContext;
  deviceAttestation: DeviceAttestation;
  environmentFactors: EnvironmentFactors;
  riskAssessment: RiskAssessment;
}

interface VerifiedIdentity {
  principalId: string;
  principalType: PrincipalType;
  authenticationMethods: AuthMethod[];
  verificationLevel: VerificationLevel;
  certificates: Certificate[];
  attestationData: string;
}

interface NetworkContext {
  sourceIP: string;
  destinationIP: string;
  networkZone: SecurityZone;
  encryptionLevel: EncryptionLevel;
  intermediaryNodes: string[];
  latency: number;
}

interface DeviceAttestation {
  deviceId: string;
  platformType: PlatformType;
  firmwareVersion: string;
  securityFeatures: SecurityFeature[];
  integrityMeasurements: IntegrityMeasurement[];
  trustScore: number;
}

enum PrincipalType {
  SERVICE = 'SERVICE',
  USER = 'USER',
  CONTAINER = 'CONTAINER',
  FUNCTION = 'FUNCTION',
  PIPELINE = 'PIPELINE'
}

enum VerificationLevel {
  BASIC = 'BASIC',
  ENHANCED = 'ENHANCED',
  HIGH_ASSURANCE = 'HIGH_ASSURANCE'
}

export class ZeroTrustSecretDistributor {
  private identityVerifier: IdentityVerifier;
  private riskEngine: RiskAssessmentEngine;
  private encryptionManager: EncryptionManager;
  private auditLogger: AuditLogger;
  private distributionCache: Map<string, DistributionSession> = new Map();

  constructor(
    identityVerifier: IdentityVerifier,
    riskEngine: RiskAssessmentEngine,
    encryptionManager: EncryptionManager,
    auditLogger: AuditLogger
  ) {
    this.identityVerifier = identityVerifier;
    this.riskEngine = riskEngine;
    this.encryptionManager = encryptionManager;
    this.auditLogger = auditLogger;
  }

  async distributeSecret(
    secretId: string,
    distributionRequest: SecretDistributionRequest
  ): Promise<DistributionResult> {
    
    // Step 1: Comprehensive identity verification
    const verifiedContext = await this.verifyZeroTrustContext(distributionRequest);
    
    // Step 2: Risk assessment
    const riskAssessment = await this.assessDistributionRisk(secretId, verifiedContext);
    
    // Step 3: Policy evaluation
    const policyDecision = await this.evaluateDistributionPolicy(secretId, verifiedContext, riskAssessment);
    
    if (policyDecision.decision !== 'PERMIT') {
      await this.auditLogger.logDistributionDenial(secretId, verifiedContext, policyDecision.reason);
      throw new Error(`Distribution denied: ${policyDecision.reason}`);
    }
    
    // Step 4: Establish secure channel
    const secureChannel = await this.establishSecureChannel(verifiedContext);
    
    // Step 5: Retrieve and prepare secret
    const secretValue = await this.retrieveSecretForDistribution(secretId, verifiedContext);
    
    // Step 6: Apply additional security measures based on risk
    const securityMeasures = this.determineSecurityMeasures(riskAssessment);
    const preparedSecret = await this.applySecurityMeasures(secretValue, securityMeasures);
    
    // Step 7: Distribute secret through secure channel
    const distributionResult = await this.performSecureDistribution(
      preparedSecret,
      secureChannel,
      securityMeasures
    );
    
    // Step 8: Create distribution session for monitoring
    await this.createDistributionSession(secretId, verifiedContext, distributionResult);
    
    // Step 9: Log successful distribution
    await this.auditLogger.logDistributionSuccess(secretId, verifiedContext, distributionResult);
    
    return distributionResult;
  }

  private async verifyZeroTrustContext(request: SecretDistributionRequest): Promise<ZeroTrustContext> {
    // Verify identity using multiple authentication factors
    const identity = await this.identityVerifier.verifyMultiFactor(request.credentials);
    
    // Assess network context
    const networkContext = await this.assessNetworkContext(request.networkInfo);
    
    // Perform device attestation
    const deviceAttestation = await this.performDeviceAttestation(request.deviceInfo);
    
    // Collect environmental factors
    const environmentFactors = await this.collectEnvironmentFactors(request);
    
    // Perform comprehensive risk assessment
    const riskAssessment = await this.riskEngine.assessContext({
      identity,
      networkContext,
      deviceAttestation,
      environmentFactors
    });
    
    return {
      identity,
      networkContext,
      deviceAttestation,
      environmentFactors,
      riskAssessment
    };
  }

  private async performDeviceAttestation(deviceInfo: DeviceInfo): Promise<DeviceAttestation> {
    // Verify device identity and integrity
    const attestationChallenge = await this.generateAttestationChallenge();
    const attestationResponse = await this.requestDeviceAttestation(deviceInfo.deviceId, attestationChallenge);
    
    // Validate attestation response
    const isValid = await this.validateAttestationResponse(attestationResponse, attestationChallenge);
    if (!isValid) {
      throw new Error('Device attestation failed');
    }
    
    // Extract device security features
    const securityFeatures = await this.extractSecurityFeatures(attestationResponse);
    
    // Perform integrity measurements
    const integrityMeasurements = await this.performIntegrityMeasurements(deviceInfo);
    
    // Calculate trust score
    const trustScore = await this.calculateDeviceTrustScore(securityFeatures, integrityMeasurements);
    
    return {
      deviceId: deviceInfo.deviceId,
      platformType: deviceInfo.platformType,
      firmwareVersion: deviceInfo.firmwareVersion,
      securityFeatures,
      integrityMeasurements,
      trustScore
    };
  }

  private async establishSecureChannel(context: ZeroTrustContext): Promise<SecureChannel> {
    // Select encryption level based on risk assessment
    const encryptionLevel = this.selectEncryptionLevel(context.riskAssessment);
    
    // Generate ephemeral keys for this session
    const ephemeralKeys = await this.encryptionManager.generateEphemeralKeyPair();
    
    // Establish mutually authenticated TLS connection
    const tlsConfig = {
      version: 'TLSv1.3',
      cipherSuite: this.selectCipherSuite(encryptionLevel),
      certificateVerification: 'MUTUAL',
      clientCertificate: context.identity.certificates[0],
      ephemeralKeys
    };
    
    const secureChannel = await this.encryptionManager.establishTLSConnection(tlsConfig);
    
    // Add additional encryption layer for highly sensitive secrets
    if (encryptionLevel === EncryptionLevel.QUANTUM_RESISTANT) {
      const additionalEncryption = await this.encryptionManager.createQuantumResistantLayer();
      secureChannel.addEncryptionLayer(additionalEncryption);
    }
    
    return secureChannel;
  }

  private async applySecurityMeasures(
    secretValue: SecretValue,
    measures: SecurityMeasure[]
  ): Promise<PreparedSecret> {
    let preparedSecret: PreparedSecret = {
      value: secretValue,
      metadata: {
        originalSize: this.calculateSecretSize(secretValue),
        preparationTime: new Date(),
        securityMeasures: measures.map(m => m.type)
      }
    };
    
    for (const measure of measures) {
      switch (measure.type) {
        case SecurityMeasureType.TIME_BOUND_ACCESS:
          preparedSecret = await this.applyTimeBounds(preparedSecret, measure.parameters);
          break;
        
        case SecurityMeasureType.GEOGRAPHIC_RESTRICTION:
          preparedSecret = await this.applyGeographicRestriction(preparedSecret, measure.parameters);
          break;
        
        case SecurityMeasureType.USAGE_LIMITATION:
          preparedSecret = await this.applyUsageLimitation(preparedSecret, measure.parameters);
          break;
        
        case SecurityMeasureType.FORWARD_SECRECY:
          preparedSecret = await this.applyForwardSecrecy(preparedSecret, measure.parameters);
          break;
        
        case SecurityMeasureType.SPLIT_KNOWLEDGE:
          preparedSecret = await this.applySplitKnowledge(preparedSecret, measure.parameters);
          break;
      }
    }
    
    return preparedSecret;
  }

  private async applyTimeBounds(secret: PreparedSecret, parameters: any): Promise<PreparedSecret> {
    const expirationTime = new Date(Date.now() + parameters.validityPeriod * 1000);
    
    // Encrypt secret with time-bound key
    const timeBoundKey = await this.encryptionManager.generateTimeBoundKey(expirationTime);
    const encryptedValue = await this.encryptionManager.encrypt(secret.value, timeBoundKey);
    
    return {
      ...secret,
      value: encryptedValue,
      metadata: {
        ...secret.metadata,
        expiresAt: expirationTime,
        timeBoundKeyId: timeBoundKey.keyId
      }
    };
  }

  private async applySplitKnowledge(secret: PreparedSecret, parameters: any): Promise<PreparedSecret> {
    const threshold = parameters.threshold || 2;
    const totalShares = parameters.totalShares || 3;
    
    // Split the secret using Shamir's Secret Sharing
    const shares = await this.encryptionManager.splitSecret(secret.value, threshold, totalShares);
    
    // Distribute shares to different storage locations
    const shareLocations = await this.distributeShares(shares, parameters.shareRecipients);
    
    return {
      ...secret,
      value: {
        type: 'SPLIT_SECRET',
        threshold,
        totalShares,
        shareLocations,
        reconstructionHint: shares.reconstructionHint
      },
      metadata: {
        ...secret.metadata,
        splitIntoShares: totalShares,
        reconstructionThreshold: threshold
      }
    };
  }

  private async performSecureDistribution(
    preparedSecret: PreparedSecret,
    secureChannel: SecureChannel,
    securityMeasures: SecurityMeasure[]
  ): Promise<DistributionResult> {
    
    // Create distribution envelope with integrity protection
    const envelope = await this.createDistributionEnvelope(preparedSecret, securityMeasures);
    
    // Sign envelope for non-repudiation
    const signedEnvelope = await this.encryptionManager.signEnvelope(envelope);
    
    // Transmit through secure channel
    const transmissionId = await secureChannel.transmit(signedEnvelope);
    
    // Verify receipt and integrity
    const receipt = await secureChannel.waitForReceipt(transmissionId);
    
    if (!receipt.integrityVerified) {
      throw new Error('Distribution integrity verification failed');
    }
    
    return {
      distributionId: this.generateDistributionId(),
      transmissionId,
      status: 'SUCCESS',
      timestamp: new Date(),
      securityMeasures: securityMeasures.map(m => m.type),
      integrityHash: receipt.integrityHash,
      encryptionLevel: secureChannel.getEncryptionLevel()
    };
  }

  private async createDistributionSession(
    secretId: string,
    context: ZeroTrustContext,
    result: DistributionResult
  ): Promise<void> {
    
    const session: DistributionSession = {
      sessionId: result.distributionId,
      secretId,
      principalId: context.identity.principalId,
      distributedAt: result.timestamp,
      riskScore: context.riskAssessment.overallScore,
      securityMeasures: result.securityMeasures,
      networkContext: context.networkContext,
      deviceTrustScore: context.deviceAttestation.trustScore,
      expiresAt: this.calculateSessionExpiry(result.securityMeasures),
      isActive: true
    };
    
    this.distributionCache.set(session.sessionId, session);
    
    // Schedule session cleanup
    this.scheduleSessionCleanup(session);
  }

  async validateSecretUsage(
    distributionId: string,
    usageContext: SecretUsageContext
  ): Promise<UsageValidationResult> {
    
    const session = this.distributionCache.get(distributionId);
    if (!session || !session.isActive) {
      return {
        isValid: false,
        reason: 'Distribution session not found or expired'
      };
    }
    
    // Validate usage context against distribution constraints
    const violations = await this.checkUsageViolations(session, usageContext);
    
    if (violations.length > 0) {
      return {
        isValid: false,
        reason: `Usage violations detected: ${violations.join(', ')}`
      };
    }
    
    // Update session usage tracking
    session.lastUsed = new Date();
    session.usageCount = (session.usageCount || 0) + 1;
    
    return {
      isValid: true,
      remainingUsages: this.calculateRemainingUsages(session),
      expiresAt: session.expiresAt
    };
  }

  async revokeDistribution(distributionId: string, reason: string): Promise<void> {
    const session = this.distributionCache.get(distributionId);
    if (session) {
      session.isActive = false;
      session.revokedAt = new Date();
      session.revocationReason = reason;
      
      await this.auditLogger.logDistributionRevocation(distributionId, reason);
    }
  }

  private scheduleSessionCleanup(session: DistributionSession): void {
    const timeUntilExpiry = session.expiresAt.getTime() - Date.now();
    
    setTimeout(() => {
      this.distributionCache.delete(session.sessionId);
    }, timeUntilExpiry);
  }
}