import * as _ from 'lodash';

export class ErrorScroll {
  constructor(private $anchorScroll: ng.IAnchorScrollService, private $location: ng.ILocationService) { }

  scrollToError(form: ng.IFormController) {
    const errorField = Object.keys(form).find(key => {
      const field = form[key];
      // Check for both FE validations and BE service error validations
      return (_.has(field, '$invalid') && field.$invalid) || _.has(field, 'serviceError')
    });

    if (errorField) {
      this.$location.hash(errorField);
      this.$anchorScroll();
    }
  }
}