/**
 *****************************************
 * Created by edonet@163.com
 * Created on 2020-01-16 15:06:08
 *****************************************
 */
'use strict';


/**
 *****************************************
 * 加载依赖
 *****************************************
 */
import { setTimer } from './delay';


/**
 *****************************************
 * 延时执行
 *****************************************
 */
function delay<T>(time: number | undefined, callback?: () => T): Promise<void | T> {
    return new Promise((resolve, reject) => {
        setTimer(time, () => {
            if (typeof callback === 'function') {
                try {
                    resolve(callback());
                } catch (err) {
                    reject(err);
                }
            } else {
                resolve(callback);
            }
        });
    });
}


/**
 *****************************************
 * 延时对象
 *****************************************
 */
function defer(): Promise<void>;
function defer(time: number): Promise<void>;
function defer<T>(time: number, callback: () => T): Promise<T>;
function defer<T>(time: number, callback: T): Promise<T>;
function defer<T>(callback: () => T): Promise<T>;
function defer<T>(callback: () => T, time: number): Promise<T>;
function defer<T>(time?: (() => T) | number, callback?: unknown): Promise<void | T> {

    // 重载参数
    if (typeof time === 'function') {
        return delay(callback as number, time as () => T);
    }

    // 解析函数
    return delay<T>(time as number, callback as () => T);
}


/**
 *****************************************
 * 抛出接口
 *****************************************
 */
export { defer, delay };