const toString = Object.prototype.toString;

export function is(val, type) {
  return toString.call(val) === `[object ${type}]`;
}

export function isDef(val) {
  return typeof val !== 'undefined';
}

export function isUnDef(val) {
  return !isDef(val);
}

export function isObject(val) {
  return val !== null && is(val, 'Object');
}

export function isEmpty(val) {
  if (isArray(val) || isString(val)) {
    return val.length === 0;
  }

  if (val instanceof Map || val instanceof Set) {
    return val.size === 0;
  }

  if (isObject(val)) {
    return Object.keys(val).length === 0;
  }

  return false;
}

export function isDate(val) {
  return is(val, 'Date');
}

export function isNull(val) {
  return val === null;
}

export function isNullAndUnDef(val) {
  return isUnDef(val) && isNull(val);
}

export function isNullOrUnDef(val) {
  return isUnDef(val) || isNull(val);
}

export function isNumber(val) {
  return is(val, 'Number');
}

export function isPromise(val) {
  return is(val, 'Promise') && isObject(val) && isFunction(val.then) && isFunction(val.catch);
}

export function isString(val) {
  return is(val, 'String');
}

export function isFunction(val) {
  return typeof val === 'function';
}

export function isBoolean(val) {
  return is(val, 'Boolean');
}

export function isRegExp(val) {
  return is(val, 'RegExp');
}

export function isArray(val) {
  return val && Array.isArray(val);
}

export function isMap(val) {
  return is(val, 'Map');
}
export function isPhone(phone) {
  const reg = /^(?:(?:\+|00)86)?1(?:(?:3[\d])|(?:4[5-79])|(?:5[0-35-9])|(?:6[5-7])|(?:7[0-8])|(?:8[\d])|(?:9[189]))\d{8}$/;
  return reg.test(phone);
}
export function isEmail(email) {
  const reg = /^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
  return reg.test(email);
}

// 常用正则 
let Regular = {
	digits: /^\d+$/,			// 正整数
	letter: /^[a-zA-Z]*$/,			// 数字
	chinese: /^[\u4e00-\u9fa5]+$/gi,			//中文
	phone: /0?(13|14|15|17|18|19)[0-9]{9}/,				// 手机号
	amount:	/^[1-9]\d*(,\d{3})*(\.\d{1,2})?$|^0\.\d{1,2}$/,			// 金额。值允许两位小数
	email: /^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/,				// 邮箱
	idcard: /^[1-9]\d{5}(18|19|([23]\d))\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/, 	// 身份证
	empty: (value) => {					// 是否为空
		switch (typeof value) {
			case 'undefined':
				return true;
			case 'string':
				if (value.replace(/(^[ \t\n\r]*)|([ \t\n\r]*$)/g, '').length == 0) return true;
				break;
			case 'boolean':
				if (!value) return true;
				break;
			case 'number':
				if (0 === value || isNaN(value)) return true;
				break;
			case 'object':
				if (null === value || value.length === 0) return true;
				for (var i in value) {
					return false;
				}
				return true;
		}
		return false;
	}
}