// 事件管理器模块
const eventManager = {
  listeners: {},
  on(event, callback) {
    if (!this.listeners[event]) {
      this.listeners[event] = [];
    }
    this.listeners[event].push(callback);
  },
  off(event, callback) {
    const callbacks = this.listeners[event];
    if (callbacks) {
      this.listeners[event] = callbacks.filter(cb => cb !== callback);
    }
  },
  emit(event, data) {
    const callbacks = this.listeners[event];
    if (callbacks) {
      callbacks.forEach(callback => callback(data));
    }
  }
};

module.exports = eventManager;