angular.module('focaDirectivas')
    .directive('uppercaseOnly', [
        function() {
            return {
                restrict: 'A',
                require: 'ngModel',
                link: function(scope, element, attrs, ctrl) {

                    function parser(value) {
                        if (ctrl.$isEmpty(value)) {
                            return value;
                        }
                        var formatedValue = value.toUpperCase();
                        if (ctrl.$viewValue !== formatedValue) {
                            ctrl.$setViewValue(formatedValue);
                            ctrl.$render();
                        }
                        return formatedValue;
                    }

                    function formatter(value) {
                        if (ctrl.$isEmpty(value)) {
                            return value;
                        }
                        return value.toUpperCase();
                    }

                    ctrl.$formatters.push(formatter);
                    ctrl.$parsers.push(parser);
                }
            };
        }
    ]);