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

/**
 * @interface CommunicationCoordinatorConfig
 * @description Configuration for the GCP Communication Coordinator.
 */
export interface CommunicationCoordinatorConfig {
  projectID: string;
  pubSubTopic?: string;
  cloudStorageBucket?: string;
  firebaseDatabaseUrl?: string;
  cdnService?: string;
  endpointsService?: string;
  // Add authentication details if needed
}

/**
 * @interface CommunicationCoordinatorOperations
 * @description Defines operations for coordinating across GCP communication and storage services.
 */
export interface CommunicationCoordinatorOperations {
  publishMessage(topic: string, message: any): Promise<void>;
  subscribeToTopic(topic: string, handler: (message: any) => void): Promise<void>;
  uploadAgentState(agentId: string, state: any): Promise<string>; // Returns file URL
  downloadAgentState(fileUrl: string): Promise<any>;
  syncRealtimeData(path: string, data: any): Promise<void>;
  getRealtimeData(path: string): Promise<any>;
  distributeDataGlobally(data: any): Promise<string>; // Returns CDN URL
}

/**
 * @class CommunicationCoordinator
 * @description Orchestrates real-time messaging, persistent storage, and data distribution across Google Cloud Pub/Sub, Cloud Storage, Firebase Realtime Database, Cloud CDN, and Cloud Endpoints.
 */
export class CommunicationCoordinator implements CommunicationCoordinatorOperations {
  private config: CommunicationCoordinatorConfig;
  private logger: Logger;
  // Placeholders for GCP communication/storage clients
  // private pubSubClient: any;
  // private storageClient: any;
  // private firebaseClient: any;
  // private cdnClient: any;
  // private endpointsClient: any;

  constructor(config: CommunicationCoordinatorConfig) {
    this.config = config;
    this.logger = new Logger('CommunicationCoordinator');
    this.logger.info('GCP Communication Coordinator initialized.');
    // Initialize GCP communication/storage clients here (conceptual)
  }

  /**
   * Publishes a message to a Google Cloud Pub/Sub topic.
   * @param {string} topic The Pub/Sub topic to publish to.
   * @param {any} message The message payload.
   * @returns {Promise<void>}
   */
  public async publishMessage(topic: string, message: any): Promise<void> {
    this.logger.info(`Publishing message to Pub/Sub topic ${topic}...`, message);
    // Simulate Pub/Sub publish
    await new Promise(resolve => setTimeout(resolve, 50)); // Simulate latency
    this.logger.debug('Message published.');
  }

  /**
   * Subscribes to a Google Cloud Pub/Sub topic.
   * @param {string} topic The Pub/Sub topic to subscribe to.
   * @param {(message: any) => void} handler The message handler function.
   * @returns {Promise<void>}
   */
  public async subscribeToTopic(topic: string, handler: (message: any) => void): Promise<void> {
    this.logger.info(`Subscribing to Pub/Sub topic ${topic}...`);
    // Simulate Pub/Sub subscription
    // In a real scenario, this would set up a listener.
    setInterval(() => {
      const simulatedMessage = { data: `Simulated message from ${topic} at ${Date.now()}` };
      handler(simulatedMessage);
    }, 5000); // Simulate message every 5 seconds
    this.logger.debug('Subscribed to topic.');
  }

  /**
   * Uploads agent state to Google Cloud Storage.
   * @param {string} agentId The ID of the agent.
   * @param {any} state The agent's state to upload.
   * @returns {Promise<string>} The URL of the uploaded state file.
   */
  public async uploadAgentState(agentId: string, state: any): Promise<string> {
    this.logger.info(`Uploading state for agent ${agentId} to Cloud Storage bucket ${this.config.cloudStorageBucket}...`);
    // Simulate Cloud Storage upload
    await new Promise(resolve => setTimeout(resolve, 150)); // Simulate latency
    const fileUrl = `gs://${this.config.cloudStorageBucket}/agent_states/${agentId}-${Date.now()}.json`;
    this.logger.debug(`Agent state uploaded: ${fileUrl}`);
    return fileUrl;
  }

  /**
   * Downloads agent state from Google Cloud Storage.
   * @param {string} fileUrl The URL of the state file.
   * @returns {Promise<any>} The downloaded agent state.
   */
  public async downloadAgentState(fileUrl: string): Promise<any> {
    this.logger.info(`Downloading agent state from Cloud Storage: ${fileUrl}...`);
    // Simulate Cloud Storage download
    await new Promise(resolve => setTimeout(resolve, 100)); // Simulate latency
    const state = { status: 'downloaded', data: 'simulated_agent_state' };
    this.logger.debug('Agent state downloaded.', state);
    return state;
  }

  /**
   * Synchronizes real-time data using Firebase Realtime Database.
   * @param {string} path The path in the database.
   * @param {any} data The data to synchronize.
   * @returns {Promise<void>}
   */
  public async syncRealtimeData(path: string, data: any): Promise<void> {
    this.logger.info(`Syncing real-time data to Firebase Realtime Database at path ${path}...`, data);
    // Simulate Firebase write
    await new Promise(resolve => setTimeout(resolve, 60)); // Simulate latency
    this.logger.debug('Real-time data synced.');
  }

  /**
   * Retrieves real-time data from Firebase Realtime Database.
   * @param {string} path The path in the database.
   * @returns {Promise<any>} The retrieved data.
   */
  public async getRealtimeData(path: string): Promise<any> {
    this.logger.info(`Retrieving real-time data from Firebase Realtime Database at path ${path}...`);
    // Simulate Firebase read
    await new Promise(resolve => setTimeout(resolve, 50)); // Simulate latency
    const data = { path, value: 'simulated_realtime_data' };
    this.logger.debug('Real-time data retrieved.', data);
    return data;
  }

  /**
   * Distributes data globally using Cloud CDN.
   * @param {any} data The data to distribute.
   * @returns {Promise<string>} The CDN URL for the distributed data.
   */
  public async distributeDataGlobally(data: any): Promise<string> {
    this.logger.info('Distributing data globally via Cloud CDN...', data);
    // Simulate CDN distribution
    await new Promise(resolve => setTimeout(resolve, 200)); // Simulate distribution time
    const cdnUrl = `https://cdn.example.com/distributed_data/${Date.now()}.json`;
    this.logger.debug(`Data distributed via CDN: ${cdnUrl}`);
    return cdnUrl;
  }
}