/********************************************************************************
 * Copyright (C) 2019 TypeFox and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/

import { TreeWidget } from './tree-widget';
import { SelectableTreeNode } from './tree-selection';

export type TreeWidgetSelection = ReadonlyArray<Readonly<SelectableTreeNode>> & {
  source: TreeWidget
};
export namespace TreeWidgetSelection {
  export function isSource(selection: Object | undefined, source: TreeWidget): boolean {
    return getSource(selection) === source;
  }

  export function getSource(selection: Object | undefined): TreeWidget | undefined {
    return is(selection) ? selection.source : undefined;
  }

  export function is(selection: Object | undefined): selection is TreeWidgetSelection {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    return Array.isArray(selection) && ('source' in selection) && <any>selection['source'] instanceof TreeWidget;
  }

  export function create(source: TreeWidget): TreeWidgetSelection {
    return Object.assign(source.model.selectedNodes, {source});
  }
}