text: import { makeObservable, action, comparer, computed } from "mobx"; 
  import multiGroupBy from "../utils/multiGroupBy";
  import sortGroups from "../utils/sortGroups";
  import flattenGroups from "../utils/flattenGroups";
  import getSorter from "../utils/getSorter";
  import getFilteredIndexes from "../utils/getFilteredIndexes";
  import Base from "../Base";
  
  const stubFalse = () => false;
  
  class Mobx extends Base {
  
      get visibleColumns(){
          return this.columns.filter( col => !this.groupKeys.includes( col.dataKey ) );
      }
  
      get priorityGroupValuesArray(){
          return this.groupKeys.map( dataKey => this.columns.find( c => c.dataKey === dataKey ).priorityGroupValues || [] );
      }
  
      get grouped(){
          return multiGroupBy( this.filteredIndexes, this.groupKeys, this.getRowData, this.priorityGroupValuesArray );
      }
  
      get groupedSorted(){
          if( this.sortDataKey ){
              sortGroups( this.grouped, this.getRowData, this.sortDataKey, this.sortDirection, this.groupKeys.length );
          }
          return this.grouped;
      }
  
      get flattenedGroups(){
          return flattenGroups( this.groupedSorted, this.collapsedGroups );
      }
  
      get filteredIndexes(){
          return getFilteredIndexes( this.rowsQuantity, this.getRowData, this.filtersMap );
      }
  
      get noGroupsSortedIndexes(){
          return this.sortDataKey ? this.filteredIndexes.sort( getSorter( this.getRowData, this.sortDataKey, this.sortDirection ) ) : this.filteredIndexes;
      }
  
      get groupsSortedIndexes(){
          return this.flattenedGroups.rowIndexes;
      }
  
      get hasGrouping(){
          return !!this.groupKeys.length;
      }
  
      get finalIndexes(){
          return this.hasGrouping ? this.groupsSortedIndexes : this.noGroupsSortedIndexes;
      }
  
      constructor(){
          super();
  
          makeObservable( this, {
              grouped: computed,
              flattenedGroups: computed,
              filteredIndexes: computed,
              hasGrouping: computed,
              
              visibleColumns: computed({ equals: comparer.structural }),
              priorityGroupValuesArray: computed({ equals: comparer.structural }),
              
              finalIndexes: computed({ equals: stubFalse }),
              noGroupsSortedIndexes: computed({ equals: stubFalse }),
              groupedSorted: computed({ equals: stubFalse }),
  
              rowsQuantity: true,
              getRowData: true,
              getTotalsFormattingHelper: true,
              columns: true,
              compact: true,
              filtersMap: true,
              groupKeys: true,
              sortDataKey: true,
              sortDirection: true,
              collapsedGroups: true,
          
              setFiltering: action,
              toggleCompact: action,
              setSorting: action,
              setGrouping: action,
              addGrouping: action,
              toggleCollapsedGroup: action,
              removeGrouping: action,
              merge: action,
          });
      }
  }
  
  export default Mobx;