import { Logger } from '../../utils/logger';
import { EventBus } from '../events/event-bus';
import { DatabaseCoordinator } from '../../integrations/gcp/database-coordinator';
import { CommunicationCoordinator } from '../../integrations/gcp/communication-coordinator';

/**
 * @interface CrossCommunicationConfig
 * @description Configuration for Cross-Component Communication.
 */
export interface CrossCommunicationConfig {
  projectID: string;
  // Add configuration for communication protocols, message queues, etc.
}

/**
 * @interface CrossCommunicationOperations
 * @description Defines operations for standardized communication and data synchronization between all system components.
 */
export interface CrossCommunicationOperations {
  publishSystemEvent(eventType: string, payload: any): Promise<void>;
  subscribeToSystemEvent(eventType: string, handler: (payload: any) => void): Promise<void>;
  syncData(sourceComponent: string, targetComponent: string, data: any): Promise<void>;
  requestStatusUpdate(componentName: string): Promise<any>;
  propagateError(error: Error, sourceComponent: string): Promise<void>;
}

/**
 * @class CrossComponentCommunication
 * @description Provides standardized communication protocols, event routing, and data synchronization between all Gemini-Flow system components.
 */
export class CrossComponentCommunication implements CrossCommunicationOperations {
  private config: CrossCommunicationConfig;
  private logger: Logger;
  private eventBus: EventBus;
  private databaseCoordinator: DatabaseCoordinator;
  private communicationCoordinator: CommunicationCoordinator;

  constructor(
    config: CrossCommunicationConfig,
    eventBus: EventBus,
    databaseCoordinator: DatabaseCoordinator,
    communicationCoordinator: CommunicationCoordinator
  ) {
    this.config = config;
    this.logger = new Logger('CrossComponentCommunication');
    this.eventBus = eventBus;
    this.databaseCoordinator = databaseCoordinator;
    this.communicationCoordinator = communicationCoordinator;
    this.logger.info('Cross-Component Communication initialized.');
  }

  /**
   * Publishes a system-wide event to the Event Bus.
   * @param {string} eventType The type of event (e.g., 'system:startup', 'agent:task_completed').
   * @param {any} payload The event payload.
   * @returns {Promise<void>}
   */
  public async publishSystemEvent(eventType: string, payload: any): Promise<void> {
    this.logger.info(`Publishing system event: ${eventType}`);
    await this.eventBus.publish(eventType, payload);
  }

  /**
   * Subscribes to a system-wide event.
   * @param {string} eventType The type of event to subscribe to.
   * @param {(payload: any) => void} handler The handler function for the event.
   * @returns {Promise<void>}
   */
  public async subscribeToSystemEvent(eventType: string, handler: (payload: any) => void): Promise<void> {
    this.logger.info(`Subscribing to system event: ${eventType}`);
    await this.eventBus.subscribe(eventType, handler);
  }

  /**
   * Synchronizes data between different components or between a component and a GCP service.
   * @param {string} sourceComponent The name of the source component.
   * @param {string} targetComponent The name of the target component or GCP service.
   * @param {any} data The data to synchronize.
   * @returns {Promise<void>}
   */
  public async syncData(sourceComponent: string, targetComponent: string, data: any): Promise<void> {
    this.logger.info(`Synchronizing data from ${sourceComponent} to ${targetComponent}...`);
    // Conceptual: Route data based on targetComponent
    if (targetComponent.startsWith('gcp:')) {
      // Example: Sync agent state to Cloud SQL
      if (targetComponent === 'gcp:cloudsql_agent_state') {
        await this.databaseCoordinator.syncAgentState(data.agentId, data.state);
      }
      // Example: Upload agent memory to Cloud Storage
      else if (targetComponent === 'gcp:cloudstorage_agent_memory') {
        await this.communicationCoordinator.uploadAgentState(data.agentId, data.memory);
      }
    } else {
      // Simulate direct component communication or in-memory sync
      await new Promise(resolve => setTimeout(resolve, 50));
    }
    this.logger.debug(`Data synchronized from ${sourceComponent} to ${targetComponent}.`);
  }

  /**
   * Requests a status update from a specific component.
   * @param {string} componentName The name of the component to query.
   * @returns {Promise<any>} The status of the component.
   */
  public async requestStatusUpdate(componentName: string): Promise<any> {
    this.logger.info(`Requesting status update from ${componentName}...`);
    // Conceptual: Send a request message to the component and await response
    await new Promise(resolve => setTimeout(resolve, 100));
    const status = { component: componentName, health: 'healthy', lastUpdate: Date.now() };
    this.logger.debug(`Status for ${componentName}:`, status);
    return status;
  }

  /**
   * Propagates an error across the system for centralized handling.
   * @param {Error} error The error object.
   * @param {string} sourceComponent The component where the error originated.
   * @returns {Promise<void>}
   */
  public async propagateError(error: Error, sourceComponent: string): Promise<void> {
    this.logger.error(`Error propagated from ${sourceComponent}: ${error.message}`);
    // Publish an error event
    await this.publishSystemEvent('system:error', { error: error.message, stack: error.stack, source: sourceComponent });
    // Conceptual: Trigger centralized error handling, alerting, and recovery mechanisms
  }
}