/**
 *****************************************
 * Created by edonet@163.com
 * Created on 2020-01-16 14:50:19
 *****************************************
 */
'use strict';


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


/**
 *****************************************
 * 设置计时器
 *****************************************
 */
function setTimer(delay: number | undefined, callback: () => void): () => void {

    // 创建帧延时
    if (typeof delay === 'number') {
        let id = setTimeout(callback, delay || 0) as unknown as number;

        // 返回取消函数
        return () => {
            if (id) {
                clearTimeout(id);
                id = 0;
            }
        };
    }

    // 创建帧延时
    return rAF(callback);
}


/**
 *****************************************
 * 延时执行
 *****************************************
 */
function delay(callback: () => void): () => void;
function delay(callback: () => void, time: number): () => void;
function delay(time: number, callback: () => void): () => void;
function delay(time: number | (() => void), callback?: unknown): () => void {

    // 重载函数
    if (typeof time === 'function') {
        return setTimer(callback as number, time);
    }

    // 校验参数
    if (typeof callback !== 'function') {
        throw new Error('`callback` expected a Function');
    }

    // 设置延时
    return setTimer(time, callback as () => void);
}


/**
 *****************************************
 * 抛出模块
 *****************************************
 */
export { delay, setTimer };