/*
 * @Author: 丘骏_jun 
 * @Date: 2019-11-21 10:59:17
 * @Last Modified by: 丘骏_jun
 * @Last Modified time: 2019-12-30 16:29:45
 */
// 通用function，通过全局安装，或import引用调用

let scrollBarWidth // 滚动条宽度
// 获取浏览器滚动条宽度
function getScrollBarWidth () {
    if (scrollBarWidth !== undefined) return scrollBarWidth;
    
    const outer = document.createElement('div');
    outer.className = 'el-scrollbar__wrap';
    outer.style.visibility = 'hidden';
    outer.style.width = '100px';
    outer.style.position = 'absolute';
    outer.style.top = '-9999px';
    document.body.appendChild(outer);
    
    const widthNoScroll = outer.offsetWidth;
    outer.style.overflow = 'scroll';
    
    const inner = document.createElement('div');
    inner.style.width = '100%';
    outer.appendChild(inner);
    
    const widthWithScroll = inner.offsetWidth;
    outer.parentNode.removeChild(outer);
    scrollBarWidth = widthNoScroll - widthWithScroll;
    
    return scrollBarWidth;
}
// 获取最近样式
// function getCurrentStyle (obj, prop) {     
//     if (obj.currentStyle) {
//         return obj.currentStyle[prop];     
//     } else if (window.getComputedStyle) {
//         prop = prop.replace(/([A-Z])/g, "-$1");           
//         prop = prop.toLowerCase();        
//         return document.defaultView.getComputedStyle(obj, null)[prop];     
//     }      
//     return null;
// }   
// // 判断是否有滚动条
// function hasScrollBar (obj) {
//     return getCurrentStyle(obj, 'overflow') == 'hidden'
//         ? 0
//         : document.body.scrollHeight > (window.innerHeight || document.documentElement.clientHeight);
// }

// 日期格式化
Date.prototype.format = function(format){ 
	var o = { 
		"M+" : this.getMonth()+1, //month 
		"d+" : this.getDate(), //day 
		"H+" : this.getHours(), //hour
		"m+" : this.getMinutes(), //minute 
		"s+" : this.getSeconds(), //second 
		"q+" : Math.floor((this.getMonth()+3)/3), //quarter 
		"S" : this.getMilliseconds() //millisecond 
	};

	if(/(y+)/.test(format)) { 
		format = format.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); 
	} 

	for(var k in o) { 
		if(new RegExp("("+ k +")").test(format)) { 
			format = format.replace(RegExp.$1, RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length)); 
		} 
	} 
	return format; 
};

// 消除字符串多余空格
if (!String.prototype.trim) {
    String.prototype.trim = function () {
      return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
    };
}  

/**
 * 获取本地缓存 localStorage
 * @param {string} key storage 标记
 * @return {*} 值
 */
function getLocalStorage(key){
    if (!key) {
        return
    }
    var result = localStorage.getItem(key) || ''
	try {
		result = JSON.parse(result)
	} catch(e) {

	}
	return result
}

/**
 * 获取本地缓存 sessionStorage
 * @param {string} key storage 标记
 * @return {*} 值
 */
function getSessionStorage(key){
	var result = sessionStorage.getItem(key) || ''
	try {
		result = JSON.parse(result)
	} catch(e) {

	}
	return result
}

/**
 * 保存本地缓存 localStorage
 * @param {string} key storage 标记
 * @param {*} value 值
 */
function setLocalStorage(key, value){
	if (typeof value === 'object') {
		value = JSON.stringify(value)
	}
	localStorage.setItem(key, value)
}

/**
 * 保存本地缓存 sessionStorage
 * @param {string} key storage 标记
 * @param {*} value 值
 */
function setSessionStorage(key, value){
	if (typeof value === 'object') {
		value = JSON.stringify(value)
	}
	sessionStorage.setItem(key, value)
}

/**
 * 移除本地缓存 localStorage
 * @param {string} key storage 标记
 */
function removeLocalStorage(key){
    localStorage.removeItem(key)
}

/**
 * 移除本地缓存 sessionStorage
 * @param {string} key storage 标记
 */
function removeSessionStorage(key){
    sessionStorage.removeItem(key)
}

/**
 * 输入的价格限制在两位小数
 * @param {string} number 价格
 * @return {string} 过滤后的价格
 */
function toFixed2 (number) {
    number += ''
    if (number == '') {
        return ''
    }
    if (isNaN(number)) {
        return ''
    }

    if (number.indexOf('.')>-1) {
        var arr = number.split('.')
        if (arr[1].length>2) {
            arr[1] = arr[1].substring(0, 2)
        }
        number = arr[0] + '.' + arr[1]
        return number
    }

    return number
}
/**
 * 价格转，分，为单位
 * @param {string|number} price 
 */
function amountFen (price) {
    return parseInt(price*100)
}

/**
 * 获取查询字符串
 * @param {string} name
 * @param {string} url 默认 location.href
 */
function getQueryString(name, url){
    url = url || location.href

    url = url.replace(/\#\S*/g, '')

    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
    var r = /\?/.test(url) && url.split('?')[1].match(reg);
    if(r != null) {
        return r[2];
    }
    return "";
}

// 全局缓存
var g_el = null
/**
 * 绑定div滚动到底部
 * @param {dom} el 
 * @param {function} callback 
 */
function onReachBottom (el, callback) {
    let offsetHeight = el.offsetHeight || window.outerHeight
    let isWindow = el === window
    g_el = el
    
    el.onscroll = ()=>{
        let scrollTop = isWindow ? document.documentElement.scrollTop : el.scrollTop
        let scrollHeight = isWindow ? document.body.scrollHeight : el.scrollHeight
        // console.log(scrollTop, scrollHeight)
        // console.log(offsetHeight, scrollTop, scrollHeight)
        if ((offsetHeight + scrollTop) - scrollHeight >= -1) {
            typeof callback === 'function' && callback()
        }
    }
}
/**
 * 取消绑定
 * @param {dom} el 
 */
function offReachBottom (el) {
    el = el || g_el
    el.onscroll = null
    g_el = null
}
/**
 * 生成唯一id
 */
function uuid () {
    var s = []
    var hexDigits = '0123456789abcdef'
    for (var i = 0; i < 36; i++) {
        s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1)
    }
    s[14] = '4';
    s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1);

    s[8] = s[13] = s[18] = s[23] = '-'
    var uuid = s.join('')
    return uuid
}

/**
 * 替换当前链接，无返回
 * @param {string} href 
 */
function urlReplace (href) {
    if (!href) {
        return;
    }
    if (href && /^#|javasc/.test(href) === false) {
        if (history.replaceState) {
            history.replaceState(null, document.title, href.split('#')[0] + '#');
            location.replace(href);
        } else {
             location.replace(href);
        }
    }
};

var fn = {
    getLocalStorage,
    getSessionStorage,
    setLocalStorage,
    setSessionStorage,
    removeLocalStorage,
    removeSessionStorage,

    // 判断是否有滚动条，并获取滚动宽度
    // getScrollBarWidth () {
    //     return hasScrollBar(document.body) ? getScrollBarWidth() : 0
    // },
    getScrollBarWidth,

    toFixed2,
    amountFen,

    getQueryString,
    onReachBottom,
    offReachBottom,

    uuid,
    urlReplace,

    /**
     * 深拷贝
     * @param {object} obj 被复制的对象
     * @return {object} 复制完成的对象
     */
    deepCopyFN (obj) {
        if (typeof obj !== 'object') {
            return obj
        }

        let cloneObj = {}
        switch (obj.constructor) {
            case Array: 
                cloneObj = []
            case Object:
                for (var property in obj) {
                    cloneObj[property] = typeof obj[property] === 'object' ? this.deepCopyFN(obj[property]) : obj[property]
                }
                break
            case Map:
                cloneObj = new Map()
                obj.forEach((value, key) => {
                    cloneObj.set(key, typeof  value === 'object' ? this.deepCopyFN(value) : value)
                })
                break
            case Set:
                cloneObj = new Set()
                obj.forEach(value => {
                    cloneObj.add(typeof value === 'object' ? this.deepCopyFN(value) : value)
                })
                break
        }
        return cloneObj
    },
}
export default fn