/**
 * 选中dom元素
 */
export function selector(el) {
    return document.querySelector(el);
}

/**
 * 警告提示
 */
export function warn() {
    let arr = [];
    for (var i = 0; i < arguments.length; i++) {
        arr.push(`${i + 1}. ${arguments[i]}`);
    }
    console.warn(arr.join('\n'));
}

/**
 * 全局监听点击事件
 */
export function listenerClose(data, handler) {
    window.addEventListener('click', (e) => handler(e));
}

/**
 * 安全拷贝数据
 */
export function safety(data) {
    return JSON.parse(JSON.stringify(data));
}

/**
 * 检测对象是否为数组
 */
export function isArray(obj) {
    return Object.prototype.toString.call(obj) == "[object Array]";
}

/**
 * 检测对象是否为函数
 */
export function isFunction(obj) {
    return Object.prototype.toString.call(obj) == "[object Function]";
}

/**
 * 转化为数字
 */
export function toNum(obj) {
    obj -= 0;
    isNaN(obj) && (obj = 0);
    return obj;
}

/**
 * 简单的深度合并
 */
export function deepMerge(obj1, obj2) {
    let key;
    for (key in obj2) {
        // 如果target(也就是obj1[key])存在，且是对象的话再去调用deepMerge，否则就是obj1[key]里面没这个对象，需要与obj2[key]合并
        // 如果obj2[key]没有值或者值不是对象，此时直接替换obj1[key]
        obj1[key] =
            obj1[key] &&
            obj1[key].toString() === "[object Object]" &&
            (obj2[key] && obj2[key].toString() === "[object Object]") ?
            deepMerge(obj1[key], obj2[key]) :
            (obj1[key] = obj2[key]);
    }
    return obj1;
}

/**
 * 数组合并
 */
export function mergeArr(arr1, arr2, prop) {
    let value = prop.value;
    let result = [...arr2];
    for (let i = 0; i <  arr1.length; i++) {
        let item = arr1[i];
        if (!arr2.find(a => a[value] == item[value])) {
            result.push(item);
        }
    }
    return result;
}



export function watch(data) {
    return new Promise((resolve, reject) => {
        for (let key in data) {
            let value = data[key];
            Object.defineProperty(data, key, {
                configurable: false, // 该状态下的属性描述符不能被修改和删除
                enumerable: false, // 该状态下的属性描述符中的属性不可被枚举
                get() {
                    return value;
                },
                set(newVal) {
                    if (newVal !== value) {
                        resolve(key, newVal, value);
                        value = newVal;
                    }
                }
            });
        }
    });
}

export function checkUserAgent() {
    const ua = navigator.userAgent;
    if (ua.indexOf('Mac OS') != -1) {
        return 'mac';
    }
    return 'win';
}

export function IEVersion() {
    var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
    var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1; //判断是否IE<11浏览器
    var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器
    var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1;
    if (isIE) {
        var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
        reIE.test(userAgent);
        var fIEVersion = parseFloat(RegExp["$1"]);
        if (fIEVersion == 7) {
            return 7;
        } else if (fIEVersion == 8) {
            return 8;
        } else if (fIEVersion == 9) {
            return 9;
        } else if (fIEVersion == 10) {
            return 10;
        } else {
            return 6; //IE版本<=7
        }
    } else if (isEdge) {
        return 'edge'; //edge
    } else if (isIE11) {
        return 11; //IE11
    } else {
        return -1; //不是ie浏览器
    }
}

export function exchangeOptionsData(arr, { prop }){
	let { disabled, children, optgroup, value } = prop;
	let newArr = [], group;
	for(let i = 0; i < arr.length; i++){
	    let item = arr[i];
		newArr.push(item);
	    if(item[optgroup]){
			group = item;
			item[children] = [];
	        continue;
	    }
	    let child = item[children];
	    if(isArray(child)){
	        group = null;
			item[optgroup] = true;
            child.forEach(c => newArr.push(c));
	        continue;
	    }
		if(group){
			group[children].push(item);
		}
	}
	return newArr;
}