goog.module('grrUi.flow.flowDescriptorsTreeDirective');
goog.module.declareLegacyNamespace();

const {ApiService, stripTypeInfo} = goog.require('grrUi.core.apiService');



/**
 * Controller for FlowDescriptorsTreeDirective.
 * @unrestricted
 */
const FlowDescriptorsTreeController = class {
  /**
   * @param {!angular.Scope} $scope
   * @param {!angular.jQuery} $element
   * @param {!ApiService} grrApiService
   * @ngInject
   */
  constructor($scope, $element, grrApiService) {
    /** @private {!angular.Scope} */
    this.scope_ = $scope;

    /** @private {!angular.jQuery} */
    this.element_ = $element;

    /** @private {!ApiService} */
    this.grrApiService_ = grrApiService;

    /** @type {!Object<string, Array<Object>>} */
    this.flowsDescriptors;

    /** @type {!Object} */
    this.userSettings;

    this.grrApiService_.get('/users/me').then(function(response) {
      this.userSettings = response.data['value']['settings'];
    }.bind(this));

    this.grrApiService_.get('/flows/descriptors').then(function(response) {
      this.flowsDescriptors =
          this.groupDescriptorsByCategory_(response['data']['items']);
    }.bind(this));

    this.scope_.$watchGroup(
        ['controller.userSettings', 'controller.flowsDescriptors'],
        this.onDescriptorsOrSettingsChange_.bind(this));
  }

  /**
   * Converts flow descriptors list to a dictionary where descriptors are
   * grouped by category.
   *
   * @param {Array<Object>} items List of descriptors to convert.
   * @return {!Object<string, Array<Object>>} Dictionary with descriptors
   *     grouped by category.
   * @private
   */
  groupDescriptorsByCategory_(items) {
    var result = {};
    angular.forEach(items, function(item) {
      var category = item['value']['category']['value'];
      result[category] = result[category] || [];
      result[category].push(item);
    }.bind(this));

    return result;
  }

  /**
   * Handles data necessary to build the tree: list of flows descriptors and
   * user settings (settings contain UI mode - BASIC/ADVANCED/DEBUG) necessary
   * to filter the flow tree.
   *
   * @private
   */
  onDescriptorsOrSettingsChange_() {
    if (angular.isUndefined(this.flowsDescriptors) ||
        angular.isUndefined(this.userSettings)) {
      return;
    }

    // Get current UI mode selected by the user. Default to "BASIC" if
    // it's not set.
    // TODO(user): stuff like this should be abstracted away into a
    // dedicated service.
    var mode = this.scope_.$eval('controller.userSettings.value.mode.value');
    if (angular.isUndefined(mode)) {
      mode = 'BASIC';
    }

    var treeNodes = [];
    var descriptorsKeys = Object.keys(this.flowsDescriptors).sort();
    angular.forEach(descriptorsKeys, function(category) {
      var categoryNode = {
        text: category,
        // Id is needed for Selenium tests backwards compatibility.
        li_attr: {id: '_' + category},
        children: []
      };

      var descriptors = this.flowsDescriptors[category].sort(function(a, b) {
        a = stripTypeInfo(a);
        b = stripTypeInfo(b);

        var aName = a['friendly_name'] || a['name'];
        var bName = b['friendly_name'] || b['name'];

        if (aName < bName) {
          return -1;
        } else if (aName > bName) {
          return 1;
        } else {
          return 0;
        }
      });
      angular.forEach(descriptors, function(descriptor) {
        var strippedDescriptor = stripTypeInfo(descriptor);

        // Filter out flows that don't support display mode selected by
        // the user.
        if (mode == 'DEBUG' ||
            strippedDescriptor['behaviours'].indexOf(mode) != -1) {
          categoryNode['children'].push({
            data: {descriptor: descriptor},
            // Id is needed for Selenium tests backwards compatibility.
            li_attr: {id: '_' + category + '-' + strippedDescriptor['name']},
            text:
                (strippedDescriptor['friendly_name'] ||
                 strippedDescriptor['name']),
            icon: 'file'
          });
        }
      }.bind(this));

      treeNodes.push(categoryNode);
    }.bind(this));

    var treeElem = $(this.element_).children('div.tree');
    treeElem.jstree({
      'core': {
        'data': treeNodes,
      }
    });
    treeElem.on('select_node.jstree', function(e, data) {
      data['instance']['toggle_node'](data['node']);

      if (data.node.data !== null) {
        var descriptor = data.node.data.descriptor;

        // Have to call apply as we're in event handler triggered by
        // non-Angular code.
        this.scope_.$apply(function() {
          this.scope_.selectedDescriptor = descriptor;
        }.bind(this));
      }
    }.bind(this));
  }
};



/**
 * FlowDescriptorsTreeDirective definition.

 * @return {angular.Directive} Directive definition object.
 */
exports.FlowDescriptorsTreeDirective = function() {
  return {
    scope: {selectedDescriptor: '=?'},
    restrict: 'E',
    template: '<div class="tree"></div>',
    controller: FlowDescriptorsTreeController,
    controllerAs: 'controller'
  };
};


/**
 * Directive's name in Angular.
 *
 * @const
 * @export
 */
exports.FlowDescriptorsTreeDirective.directive_name = 'grrFlowDescriptorsTree';
