import { Logger } from '../../utils/logger';

/**
 * @interface SecurityConfig
 * @description Configuration for Enterprise Security.
 */
export interface SecurityConfig {
  enableEncryption: boolean;
  iamIntegration: boolean;
  apiRateLimit: number;
  // Add configuration for audit logging, scanning, compliance
}

/**
 * @interface SecurityOperations
 * @description Defines operations for enterprise-grade security.
 */
export interface SecurityOperations {
  encryptData(data: string): Promise<string>;
  decryptData(encryptedData: string): Promise<string>;
  checkIAMPermissions(userId: string, resource: string, action: string): Promise<boolean>;
  auditLog(action: string, userId: string, details: any): Promise<void>;
  runSecurityScan(target: string): Promise<any>;
  // Conceptual methods for API security, compliance
}

/**
 * @class EnterpriseSecurity
 * @description Implements enterprise-grade security features including encryption, IAM integration, and audit logging.
 */
export class EnterpriseSecurity implements SecurityOperations {
  private config: SecurityConfig;
  private logger: Logger;

  constructor(config: SecurityConfig) {
    this.config = config;
    this.logger = new Logger('EnterpriseSecurity');
    this.logger.info('Enterprise Security initialized.');
  }

  /**
   * Encrypts data using a secure encryption mechanism (conceptual).
   * @param {string} data The data to encrypt.
   * @returns {Promise<string>} The encrypted data.
   */
  public async encryptData(data: string): Promise<string> {
    if (!this.config.enableEncryption) {
      this.logger.warn('Encryption is disabled. Data will not be encrypted.');
      return data;
    }
    this.logger.info('Encrypting data (conceptual)...');
    // Placeholder for actual encryption (e.g., using Cloud KMS)
    await new Promise(resolve => setTimeout(resolve, 20));
    const encrypted = Buffer.from(data).toString('base64'); // Simple base64 for simulation
    this.logger.debug('Data encrypted.');
    return encrypted;
  }

  /**
   * Decrypts data using a secure decryption mechanism (conceptual).
   * @param {string} encryptedData The encrypted data.
   * @returns {Promise<string>} The decrypted data.
   */
  public async decryptData(encryptedData: string): Promise<string> {
    if (!this.config.enableEncryption) {
      this.logger.warn('Encryption is disabled. Data will not be decrypted.');
      return encryptedData;
    }
    this.logger.info('Decrypting data (conceptual)...');
    // Placeholder for actual decryption
    await new Promise(resolve => setTimeout(resolve, 15));
    const decrypted = Buffer.from(encryptedData, 'base64').toString('utf8');
    this.logger.debug('Data decrypted.');
    return decrypted;
  }

  /**
   * Checks Google Cloud IAM permissions for a user/service account (conceptual).
   * @param {string} userId The ID of the user or service account.
   * @param {string} resource The resource to check access for.
   * @param {string} action The action to check (e.g., 'read', 'write').
   * @returns {Promise<boolean>} True if permission is granted, false otherwise.
   */
  public async checkIAMPermissions(userId: string, resource: string, action: string): Promise<boolean> {
    if (!this.config.iamIntegration) {
      this.logger.warn('IAM integration is disabled. All permission checks will return true.');
      return true;
    }
    this.logger.info(`Checking IAM permissions for ${userId} on ${resource} for action ${action} (conceptual)...`);
    // Placeholder for actual IAM API call
    await new Promise(resolve => setTimeout(resolve, 50));
    const hasPermission = Math.random() > 0.1; // 90% chance of permission granted
    this.logger.debug(`Permission granted: ${hasPermission}`);
    return hasPermission;
  }

  /**
   * Logs an audit entry for system operations and user actions (conceptual).
   * @param {string} action The action performed.
   * @param {string} userId The ID of the user or agent performing the action.
   * @param {any} details Additional details about the action.
   * @returns {Promise<void>}
   */
  public async auditLog(action: string, userId: string, details: any): Promise<void> {
    this.logger.info(`Audit Log: Action='${action}', User='${userId}'`, details);
    // Placeholder for sending to Cloud Audit Logs
    await new Promise(resolve => setTimeout(resolve, 10));
  }

  /**
   * Runs a security scan on a specified target (conceptual).
   * @param {string} target The target for the security scan (e.g., 'api_endpoint', 'gcs_bucket').
   * @returns {Promise<any>} The scan results.
   */
  public async runSecurityScan(target: string): Promise<any> {
    this.logger.info(`Running security scan on ${target} (conceptual)...`);
    // Placeholder for integrating with Cloud Security Scanner or custom tools
    await new Promise(resolve => setTimeout(resolve, 500));
    const scanResult = { target, vulnerabilitiesFound: Math.floor(Math.random() * 5), status: 'completed' };
    this.logger.debug('Security scan complete.', scanResult);
    return scanResult;
  }
}