goog.module('grrUi.core.serverErrorPreviewDirective');
goog.module.declareLegacyNamespace();

const {ServerErrorButtonDirective} = goog.require('grrUi.core.serverErrorButtonDirective');



var ERROR_EVENT_NAME = ServerErrorButtonDirective.error_event_name;

var ERROR_PREVIEW_INTERVAL = 5000;  // ms


/**
 * Controller for ServerErrorPreviewDirective.
 * @unrestricted
 */
const ServerErrorPreviewController = class {
  /**
   * @param {!angular.Scope} $rootScope
   * @param {!angular.Scope} $scope
   * @param {!angular.$timeout} $timeout
   * @ngInject
   */
  constructor($rootScope, $scope, $timeout) {
    /** @private {!angular.Scope} */
    this.rootScope_ = $rootScope;

    /** @private {!angular.Scope} */
    this.scope_ = $scope;

    /** @private {!angular.$timeout} */
    this.timeout_ = $timeout;

    /** @type {?{message: string, traceBack: string}} */
    this.error;

    /** @type {boolean} */
    this.labelVisible;

    this.rootScope_.$on(ERROR_EVENT_NAME, this.onErrorEvent.bind(this));
  }

  /**
   * Handles server error events
   *
   * @param {?} unused_event The event object
   * @param {{message: string, traceBack: string}} error The server error
   */
  onErrorEvent(unused_event, error) {
    if (!angular.isObject(error) || !angular.isString(error.message)) {
      return;
    }

    if (error.message.length) {
      this.error = error;
      this.labelVisible = true;

      // hide error preview after ERROR_PREVIEW_INTERVAL ms.
      this.timeout_(function() {
        this.labelVisible = false;
      }.bind(this), ERROR_PREVIEW_INTERVAL);
    } else {
      this.error = null;
      this.labelVisible = false;
    }
  }
};



/**
 * Directive that displays a label with the error message whenever a server
 * error occurs
 *
 * @return {!angular.Directive} Directive definition object.
 * @ngInject
 * @export
 */
exports.ServerErrorPreviewDirective = function() {
  return {
    scope: true,
    restrict: 'E',
    replace: true,
    template: '<div class="navbar-text" ng-show="controller.labelVisible">' +
        '    {$ controller.error.message $}' +
        '</div>',
    controller: ServerErrorPreviewController,
    controllerAs: 'controller'
  };
};

var ServerErrorPreviewDirective = exports.ServerErrorPreviewDirective;

/**
 * Name of the directive in Angular.
 *
 * @const
 * @export
 */
ServerErrorPreviewDirective.directive_name = 'grrServerErrorPreview';

/**
 * The duration of how long the preview is visible.
 *
 * @const
 * @export
 */
ServerErrorPreviewDirective.error_preview_interval = 5000;
