import ngModule from '../module';
import {kebabToCamel} from '../lib/string';

/**
 * Registers the element controller into the scope as a property whose name is
 * the directive value transformed to lowerCamelCase.
 *
 * @return {Object} The directive
 */
export function directive() {
    return {
        restrict: 'A',
        link: function($scope, $element, $attrs) {
            let id = kebabToCamel($attrs.vnId);
            let controller = $element[0].$ctrl ?
                $element[0].$ctrl : $element.controller($element[0].tagName.toLowerCase());

            if (!id)
                throw new Error(`vnId: Attribute can't be null`);
            if (!controller)
                throw new Error(`vnId: Can't find controller for element '${id}'`);

            $scope[id] = controller;
        }
    };
}
ngModule.directive('vnId', directive);