(function () {
    "use strict";
    angular.module('shared')
        .factory('NameUtil', [function () {
            var service = {
                nameConcat: nameConcat,
                formatName: formatName,
                formatUserName: formatUserName,
                formatStudentDisplayName: formatStudentDisplayName,
                hasName: hasName,
            };
            return service;

            //Implementation
            function nameConcat(first, last, delimiter) {
                var result = '';
                var trimFirst = angular.isString(first) ? first.trim() : '';
                var trimLast = angular.isString(last) ? last.trim() : '';
                if (trimFirst.length) {
                    result += trimFirst;
                    if (trimLast.length) {
                        result += delimiter;
                    }
                }
                if (trimLast.length) {
                    result += trimLast;
                }
                return result;
            }

            function formatName(first, last, byLastName) {
                return byLastName ? nameConcat(last, first, ', ') : nameConcat(first, last, ' ');
            }

            function formatUserName(first, last, screenName, byLastName) {
                var name = formatName(first, last, byLastName);
                return name.length ? name : (angular.isString(screenName) ? screenName : '');
            }

            function formatStudentDisplayName(first, last, screenName) {
                return first + " " + last + " "  + (!first && !last ? screenName : "(" + screenName + ")");
            }
            function hasNamePart(name) {
                return angular.isString(name) && name.trim().length;
            }
            function hasName(first, last) {
                return hasNamePart(first) || hasNamePart(last);
            }
        }])
})();