/**
 * Webhook handler with modular callback system
 */
import logger from './logger.js';

export class WebhookHandler {
  constructor() {
    this.callbacks = new Map();
    this.globalCallbacks = [];
  }

  /**
   * Register a callback for a specific event type
   * @param {string} eventType - The Gogs event type (e.g., 'push', 'create', 'delete')
   * @param {Function} callback - Function to handle the event (payload, headers) => void
   */
  on(eventType, callback) {
    if (!this.callbacks.has(eventType)) {
      this.callbacks.set(eventType, []);
    }
    this.callbacks.get(eventType).push(callback);
    logger.info(`Registered callback for event: ${eventType}`);
  }

  /**
   * Register a global callback that runs for all events
   * @param {Function} callback - Function to handle any event (eventType, payload, headers) => void
   */
  onAny(callback) {
    this.globalCallbacks.push(callback);
    logger.info('Registered global callback');
  }

  /**
   * Process an incoming webhook
   * @param {string} eventType - The event type from X-Gogs-Event header
   * @param {object} payload - The parsed webhook payload
   * @param {object} headers - Request headers
   */
  async handle(eventType, payload, headers) {
    logger.webhook(eventType, payload);

    // Execute global callbacks
    for (const callback of this.globalCallbacks) {
      try {
        await callback(eventType, payload, headers);
      } catch (error) {
        logger.error('Error in global callback', error);
      }
    }

    // Execute event-specific callbacks
    const callbacks = this.callbacks.get(eventType);
    if (callbacks && callbacks.length > 0) {
      for (const callback of callbacks) {
        try {
          await callback(payload, headers);
        } catch (error) {
          logger.error(`Error in callback for event '${eventType}'`, error);
        }
      }
    }
  }

  /**
   * Get count of registered callbacks
   */
  getStats() {
    return {
      globalCallbacks: this.globalCallbacks.length,
      eventCallbacks: Object.fromEntries(
        Array.from(this.callbacks.entries()).map(([event, cbs]) => [event, cbs.length])
      )
    };
  }
}