import {module} from '../module';
import {validateAll} from '../lib/validator';
import {firstUpper} from '../lib/string';

directive.$inject = ['$interpolate', '$compile', '$window']
export function directive(interpolate, compile, $window) {
    return {
        restrict: 'A',
        require: ['ngModel', '^^form'],
        link: link
    };

    function link(scope, element, attrs, ctrl) {
        let vnValidations = $window.validations;

        if (!attrs.vnValidation || !vnValidations)
            return;

        let split = attrs.vnValidation.split('.');

        if (split.length !== 2)
            throw new Error(`vnValidation: Attribute must have this syntax: [entity].[field]`);

        let entityName = firstUpper(split[0]);
        let fieldName = split[1];
        let entity = vnValidations[entityName];

        if (!entity)
            throw new Error(`vnValidation: Entity '${entityName}' doesn't exist`);

        let validations = entity.validations[fieldName];

        if (!validations || validations.length == 0)
            return;

        let errorMsg = angular.element('<span class="mdl-textfield__error"></span>');
        element.after(errorMsg);

        let input = ctrl[0];
        let form = ctrl[1];

        input.$validators.entity = function(value) {
            let parent = element.parent();

            try {
                validateAll(value, validations);
            } catch (e) {
                errorMsg.text(e.message);
                parent.attr('title', e.message);
                return false;
            }

            return true;
        };

        scope.$watch(function() {
            return (form.$submitted || input.$dirty) && input.$invalid;
        }, function(value) {
            let parent = element.parent();

            if (value) {
                parent.addClass('invalid');
                errorMsg[0].style.display = 'block';
            } else {
                parent.removeClass('invalid');
                errorMsg[0].style.display = 'none';
            }
        });
    }
}
module.directive('vnValidation', directive);