/**
 * Tel Filter
 *
 * @namespace Filters
 */
(function () {
	'use strict';

	angular.module('vfApp').filter('tel', filter);

	/**
	 * @return {Object} Filter
	 */
	function filter() {
		return function (tel) {
			if (!tel) {
				return '';
			}
			const regex = '/^+/';
			const value = tel.toString().trim().replace(regex, '');
			if (value.match(/[^0-9]/)) {
				return tel;
			}

			let country, city, number;

			switch (value.length) {
				case 1:
				case 2:
				case 3:
					city = value;
					break;
				default:
					if (value.length === 11) {
						country = value.slice(0, 1);
						city = value.slice(1, 4);
						number = value.slice(4);
					} else {
						city = value.slice(0, 3);
						number = value.slice(3);
					}
			}
			if (number && value.length === 11) {
				country = '1';
				number = number.slice(0, 3) + '-' + number.slice(3, 7);
				return (country + ' (' + city + ') ' + number).trim();
			} else if (number) {
				if (number.length > 3) {
					number = number.slice(0, 3) + '-' + number.slice(3, 7);
				}
				return ('(' + city + ') ' + number).trim();
			}
			return '(' + city;
		};
	}
})();