import isArray from './isArray'
import isDate from './isDate';
import isRegExp from './isRegExp';
/**
 * @description 对象深拷贝
 * 来源Vuex https://github.com/vuejs/vuex/blob/dev/src/util.js 解决了循环引用问题
 * 对其深度拷贝进行二次优化, 添加Date其他类型的判断 {time:new Date(), regexp:/\w+/}
 * @param {*} obj 要进行拷贝的源数据
 * @param {Array<any>} [cache=[]] 利用数组存储已经拷贝过的数据, 每次拷贝会从cache中查询有没有拷贝过
 * @return {*}  {*} 返回拷贝的数据
 * @example deepCopy({age:12, time:new Date(), regexp:/\w+/, fn:function(){}}, [])
 */
const deepCopy = (obj: any, cache: Array<any> = []): any => {
	if (obj === null || typeof obj !== 'object') return obj
	let hit: any = cache.filter(function (c) {
		return c.original === obj
	})[0]
	if (hit) return hit.copy
	let copy:any;
	//添加Date和RegExp类型
	if(isDate(obj)) copy = new Date(obj);
	else if(isRegExp(obj)) copy = new RegExp(obj);
	else if (isArray(obj)) copy = []
	else copy = {}
	cache.push({
		original: obj,
		copy,
	})
	Object.keys(obj).forEach((key) => {
		copy[key] = deepCopy(obj[key], cache)
	})
	return copy
}
export default deepCopy