/*
 * Copyright 2025 coze-dev Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { type Callback } from '../types';

class EventEmitter {
  private eventMap = new Map<string, Callback>();

  on(event: string, callback: Callback): void {
    this.eventMap.set(event, callback);
  }

  off(event: string): void {
    this.eventMap.delete(event);
  }

  getEventCallback(event: string): Callback | undefined {
    return this.eventMap.get(event);
  }

  emit(event: string): Promise<void> | void {
    return this.getEventCallback(event)?.() as any;
  }
}

export const eventEmitter = new EventEmitter();
