import { Iterable } from 'ix';

import {
  IterableLike,
  ObservableLike,
  ObservableOrValue,
} from '../../../WebRx';
import {
  AsyncDataGridViewModel,
  DataSourceResponseSelector,
} from '../DataGrid/AsyncDataGridViewModel';
import {
  DataSourceRequest,
  DataSourceResponse,
} from '../DataGrid/DataGridViewModel';
import { SearchViewModel } from '../Search/SearchViewModel';
import { ItemListPanelContext } from './ItemListPanelViewModel';
import { TreeItemListPanelViewModel } from './TreeItemListPanelViewModel';

export class AsyncTreeItemListPanelViewModel<
  T,
  TRequestContext = any
> extends TreeItemListPanelViewModel<T, TRequestContext> {
  public static displayName = 'AsyncTreeItemListPanelViewModel';

  /**
   * @param responseSelector delegate that produces a response from a request.
   * @param itemsSource delegate to produce sub-items from a source item.
   * @param search search handler. if omitted a default search handler will be created. use null for no search handling.
   * @param context request context included in projection requests. if included requests are bound to context events.
   */
  constructor(
    protected readonly responseSelector: DataSourceResponseSelector<
      T,
      TRequestContext
    >,
    itemsSource: (item: T) => IterableLike<T> | undefined,
    search?: SearchViewModel | null,
    context?: ObservableLike<TRequestContext>,
    rateLimit = AsyncDataGridViewModel.DefaultRateLimit,
  ) {
    super(
      Iterable.empty<T>(),
      itemsSource,
      x => x,
      undefined,
      search,
      context,
      rateLimit,
    );
  }

  getResponse(
    request:
      | DataSourceRequest<ItemListPanelContext<TRequestContext>>
      | undefined,
  ) {
    return this.responseSelector(request);
  }
}