import { injectable } from 'inversify';
import { SelectableTreeNode, TreeSelection, TreeSelectionService } from './tree-selection';
import { DisposableCollection, EmitterProxy } from '@gedit/utils';

@injectable()
export class TreeSelectionProxy implements TreeSelectionService {
  protected toDispose = new DisposableCollection();
  protected readonly onSelectionChangedEmitter = new EmitterProxy<ReadonlyArray<Readonly<SelectableTreeNode>>>(this.selection.onSelectionChanged);
  readonly onSelectionChanged = this.onSelectionChangedEmitter.event;
  constructor(
    protected readonly selection: TreeSelectionService
  ) {
  }
  get selectedNodes(): ReadonlyArray<Readonly<SelectableTreeNode>> {
    return this.selection.selectedNodes;
  }

  dispose(): void {
    this.onSelectionChangedEmitter.dispose();
  }
  addSelection(selectionOrTreeNode: TreeSelection | Readonly<SelectableTreeNode>): void {
    this.selection.addSelection(selectionOrTreeNode);
  }
  storeState(): object {
    return this.selection.storeState();
  }
  restoreState(state: object): void {
    this.selection.restoreState(state);
  }

}