/**
 * Simple Event Emitter for Protocol Handler
 */

export type EventHandler = (data: any) => void;

export class SimpleEventEmitter {
  private handlers: Map<string, Set<EventHandler>> = new Map();

  on(event: string, handler: EventHandler): void {
    if (!this.handlers.has(event)) {
      this.handlers.set(event, new Set());
    }
    this.handlers.get(event)!.add(handler);
  }

  off(event: string, handler: EventHandler): void {
    const handlers = this.handlers.get(event);
    if (handlers) {
      handlers.delete(handler);
    }
  }

  emit(event: string, data: any): void {
    const handlers = this.handlers.get(event);
    if (handlers) {
      for (const handler of handlers) {
        try {
          handler(data);
        } catch (e) {
          console.error(`Error in event handler for '${event}':`, e);
        }
      }
    }
  }

  removeAllListeners(event?: string): void {
    if (event) {
      this.handlers.delete(event);
    } else {
      this.handlers.clear();
    }
  }
}