import {
  DataGridProvider,
  FetchByOffsetGridParameters,
  FetchByOffsetGridResults,
  GridItem,
  GridBodyItem,
  GridHeaderItem
} from 'ojs/ojdatagridprovider';
import { EventTargetMixin } from 'ojs/ojeventtarget';

interface DataParams {
  dataArray?: Array<Object>,
}

export class SampleDataGridProvider<D> implements DataGridProvider<D> {
  addEventListener: () => void;
  removeEventListener: () => void;

  constructor(protected dataParams?: DataParams) { }

  public fetchByOffset(
    parameters: FetchByOffsetGridParameters
  ): Promise<FetchByOffsetGridResults<D>> {
    return null;
  }

  public getCapability(capabilityName: string): any {
    return null;
  }

  public isEmpty(): 'yes' | 'no' | 'unknown' {
    return (this.dataParams.dataArray.length <= 0) ? 'yes' : 'no'; // Returns 'yes' if not given any data, returns 'no' otherwise
  }
}

// This is a convenience for registering addEventListener/removeEventListener
EventTargetMixin.applyMixin(SampleDataGridProvider);