import type { Aggregator } from './aggregator.interface';
import type { GroupingComparerItem } from './groupingComparerItem.interface';
import type { GroupingFormatterItem } from './groupingFormatterItem.interface';
import type { SortDirectionNumber } from './sortDirectionNumber.enum';

export type GroupingGetterFunction<T = any> = (value: T) => any;

export interface Grouping<T = any> {
  /** Grouping Aggregators array */
  aggregators?: Aggregator[];

  /** Defaults to false, are we aggregating child grouping? */
  aggregateChildGroups?: boolean;

  /** Defaults to false, are the Aggregator Collapsed when grid is loaded */
  aggregateCollapsed?: boolean;

  /** Defaults to false, are we aggregating empty grouping? */
  aggregateEmpty?: boolean;

  /** Defaults to false, is the Group Collapsed when grid is loaded */
  collapsed?: boolean;

  /** Sort Comparer callback method */
  comparer?: (a: GroupingComparerItem, b: GroupingComparerItem) => SortDirectionNumber;

  /** Defaults to false, do we want to display the row with Group Totals */
  displayTotalsRow?: boolean;

  /** String Formatter of the Grouping Header */
  formatter?: (g: GroupingFormatterItem) => string;

  /** Getter of the Column to be Grouped */
  getter?: string | GroupingGetterFunction<T>;

  /** Defaults to false, lazy load the Group Totals Calculation */
  lazyTotalsCalculation?: boolean;

  /** Set some predefined Grouping values */
  predefinedValues?: any[];

  /** defaults to true, so far only used internally by SlickDraggableGrouping */
  sortAsc?: boolean
}