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

/**
 * @interface CiCdConfig
 * @description Configuration for the CI/CD Pipeline.
 */
export interface CiCdConfig {
  environment: 'development' | 'staging' | 'production';
  testCoverageThreshold: number; // e.g., 0.95
  // Add configuration for repository, build steps, deployment targets, etc.
}

/**
 * @interface CiCdOperations
 * @description Defines operations for automated CI/CD pipelines.
 */
export interface CiCdOperations {
  runPipeline(): Promise<void>;
  runAutomatedTests(): Promise<boolean>;
  performCodeQualityChecks(): Promise<boolean>;
  deployApplication(targetEnvironment: 'staging' | 'production'): Promise<void>;
  rollbackDeployment(environment: 'staging' | 'production', version: string): Promise<void>;
  manageFeatureFlag(flagName: string, enable: boolean): Promise<void>;
}

/**
 * @class CiCdPipeline
 * @description Implements automated CI/CD pipelines for testing, building, and deploying Gemini-Flow.
 */
export class CiCdPipeline implements CiCdOperations {
  private config: CiCdConfig;
  private logger: Logger;

  constructor(config: CiCdConfig) {
    this.config = config;
    this.logger = new Logger('CiCdPipeline');
    this.logger.info('CI/CD Pipeline initialized.');
  }

  /**
   * Runs the complete CI/CD pipeline.
   * @returns {Promise<void>}
   */
  public async runPipeline(): Promise<void> {
    this.logger.info(`Running CI/CD pipeline for environment: ${this.config.environment}...`);

    this.logger.info('Running automated tests...');
    const testsPassed = await this.runAutomatedTests();
    if (!testsPassed) {
      this.logger.error('Automated tests failed. Pipeline aborted.');
      return;
    }

    this.logger.info('Performing code quality checks...');
    const qualityChecksPassed = await this.performCodeQualityChecks();
    if (!qualityChecksPassed) {
      this.logger.error('Code quality checks failed. Pipeline aborted.');
      return;
    }

    this.logger.info(`Deploying to ${this.config.environment} environment...`);
    await this.deployApplication(this.config.environment);

    this.logger.info('CI/CD pipeline completed successfully.');
  }

  /**
   * Runs automated tests (unit, integration, performance).
   * @returns {Promise<boolean>} True if tests pass, false otherwise.
   */
  public async runAutomatedTests(): Promise<boolean> {
    this.logger.info('Executing automated tests (conceptual)...');
    // This would integrate with the ComprehensiveTestRunner from Sprint 6.
    await new Promise(resolve => setTimeout(resolve, 1000));
    const testsPassed = Math.random() > 0.1; // 90% pass rate
    this.logger.debug(`Automated tests passed: ${testsPassed}`);
    return testsPassed;
  }

  /**
   * Performs code quality checks and security scanning.
   * @returns {Promise<boolean>} True if checks pass, false otherwise.
   */
  public async performCodeQualityChecks(): Promise<boolean> {
    this.logger.info('Performing code quality and security checks (conceptual)...');
    // This would integrate with linters, static analysis tools, and security scanners.
    await new Promise(resolve => setTimeout(resolve, 800));
    const checksPassed = Math.random() > 0.05; // 95% pass rate
    this.logger.debug(`Code quality checks passed: ${checksPassed}`);
    return checksPassed;
  }

  /**
   * Deploys the application to a target environment.
   * @param {'staging' | 'production'} targetEnvironment The environment to deploy to.
   * @returns {Promise<void>}
   */
  public async deployApplication(targetEnvironment: 'staging' | 'production'): Promise<void> {
    this.logger.info(`Deploying application to ${targetEnvironment} (conceptual)...`);
    // This would involve using Infrastructure as Code tools (Terraform, Kubernetes, Helm).
    await new Promise(resolve => setTimeout(resolve, 2000));
    this.logger.debug(`Application deployed to ${targetEnvironment}.`);
  }

  /**
   * Rolls back a deployment to a previous version.
   * @param {'staging' | 'production'} environment The environment to rollback.
   * @param {string} version The version to rollback to.
   * @returns {Promise<void>}
   */
  public async rollbackDeployment(environment: 'staging' | 'production', version: string): Promise<void> {
    this.logger.warn(`Rolling back deployment in ${environment} to version ${version} (conceptual)...`);
    // This would involve reverting IaC changes or Helm chart revisions.
    await new Promise(resolve => setTimeout(resolve, 1500));
    this.logger.debug(`Deployment in ${environment} rolled back to ${version}.`);
  }

  /**
   * Manages feature flags for gradual rollouts.
   * @param {string} flagName The name of the feature flag.
   * @param {boolean} enable Whether to enable or disable the flag.
   * @returns {Promise<void>}
   */
  public async manageFeatureFlag(flagName: string, enable: boolean): Promise<void> {
    this.logger.info(`Setting feature flag '${flagName}' to ${enable} (conceptual)...`);
    // This would involve interacting with a feature flag service (e.g., LaunchDarkly, Firebase Remote Config).
    await new Promise(resolve => setTimeout(resolve, 100));
    this.logger.debug(`Feature flag '${flagName}' updated.`);
  }
}