class Helpers {
    compareValues(key, order = 'asc') {
        return function innerSort(a, b) {
            if (!a.hasOwnProperty(key) || !b.hasOwnProperty(key)) {
                // property doesn't exist on either object
                return 0;
            }

            const varA = (typeof a[key] === 'string')
                ? a[key].toUpperCase() : a[key];
            const varB = (typeof b[key] === 'string')
                ? b[key].toUpperCase() : b[key];

            let comparison = 0;
            if (varA > varB) {
                comparison = 1;
            } else if (varA < varB) {
                comparison = -1;
            }
            return (
                (order === 'desc') ? (comparison * -1) : comparison
            );
        };
    }

    isEmailValid(email) {
        const expression = /(?!.*\.{2})^([a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+(\.[a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+)*|"((([\t]*\r\n)?[\t]+)?([\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|\\[\x01-\x09\x0b\x0c\x0d-\x7f\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))*(([\t]*\r\n)?[\t]+)?")@(([a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.)+([a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.?$/i;
        return expression.test(String(email).toLowerCase());
    }

    generateUUID() { // Public Domain/MIT
        let d = new Date().getTime();//Timestamp
        let d2 = new Date().getUTCMilliseconds() + Math.random();//Time in microseconds since page-load or 0 if unsupported
        return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
            let r = Math.random() * 16;//random number between 0 and 16
            if(d > 0){//Use timestamp until depleted
                r = (d + r)%16 | 0;
                d = Math.floor(d/16);
            } else {//Use microseconds since page-load if supported
                r = (d2 + r)%16 | 0;
                d2 = Math.floor(d2/16);
            }
            return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
        });
    }
}
export default new Helpers();