// EventMgr.ts

import { EventTarget } from 'cc';

export default class EventMgr {
    private static _eventMgr: EventMgr = null;

    private _eventTarget: EventTarget = null;
    private _listeners: any = null;

    public static get ins(): EventMgr {
        if (this._eventMgr == null) {
            this._eventMgr = new EventMgr();
        }

        return this._eventMgr;
    }

    private constructor() {
        this._eventTarget = new EventTarget();
        this._listeners = {};
    }

    /**
     * 添加事件监听
     */
    addEventListener(eventType: string, callback: (...args: any[]) => void, target: any) {
        this._eventTarget.on(eventType, callback, target);
    }

    /**
     * 添加一次性事件监听
     */
    addEventListenerOnce(eventType: string, callback: (...args: any[]) => void, target: any) {
        this._eventTarget.once(eventType, callback, target);
    }

    /**
     * 移除事件监听
     * 如果只传递 eventType，则移除该类型的所有监听器。
     */
    removeListener(eventType: string, callback?: (...args: any[]) => void, target?: any) {
        this._eventTarget.off(eventType, callback, target);
    }

    /**
     * 通过注册对象移除事件监听
     */
    removeListenerByTarget(target?: any) {
        this._eventTarget.targetOff(target);
    }

    /**
     * 广播分发事件
     * @param eventType
     * @param userData
     */
    dispatchEvent(eventType: string, userData?: any) {
        console.log("事件分发", eventType);
        this._eventTarget.emit(eventType, userData);
    }
}