import { DataQueryRequest, dateTime, LoadingState, PanelData, toDataFrame } from '@grafana/data';

import { filterPanelDataToQuery } from './QueryEditorRow';

function makePretendRequest(requestId: string, subRequests?: DataQueryRequest[]): DataQueryRequest {
  return {
    requestId,
    // subRequests,
  } as DataQueryRequest;
}

describe('filterPanelDataToQuery', () => {
  const data: PanelData = {
    state: LoadingState.Done,
    series: [
      toDataFrame({ refId: 'A', fields: [{ name: 'AAA' }], meta: {} }),
      toDataFrame({ refId: 'B', fields: [{ name: 'B111' }], meta: {} }),
      toDataFrame({ refId: 'B', fields: [{ name: 'B222' }], meta: {} }),
      toDataFrame({ refId: 'B', fields: [{ name: 'B333' }], meta: {} }),
      toDataFrame({ refId: 'C', fields: [{ name: 'CCCC' }], meta: { requestId: 'sub3' } }),
    ],
    error: {
      refId: 'B',
      message: 'Error!!',
    },
    request: makePretendRequest('111', [
      makePretendRequest('sub1'),
      makePretendRequest('sub2'),
      makePretendRequest('sub3'),
    ]),
    timeRange: { from: dateTime(), to: dateTime(), raw: { from: 'now-1d', to: 'now' } },
  };

  it('should not have an error unless the refId matches', () => {
    const panelData = filterPanelDataToQuery(data, 'A');
    expect(panelData?.series.length).toBe(1);
    expect(panelData?.series[0].refId).toBe('A');
    expect(panelData?.error).toBeUndefined();
  });

  it('should match the error to the query', () => {
    const panelData = filterPanelDataToQuery(data, 'B');
    expect(panelData?.series.length).toBe(3);
    expect(panelData?.series[0].refId).toBe('B');
    expect(panelData?.error!.refId).toBe('B');
  });

  it('should include errors when missing data', () => {
    const withError = {
      series: [],
      error: {
        message: 'Error!!',
      },
    } as unknown as PanelData;

    const panelData = filterPanelDataToQuery(withError, 'B');
    expect(panelData).toBeDefined();
    expect(panelData?.state).toBe(LoadingState.Error);
    expect(panelData?.error).toBe(withError.error);
  });

  it('should set the state to done if the frame has no errors', () => {
    const withError = {
      ...data,
    };
    withError.state = LoadingState.Error;

    const panelDataB = filterPanelDataToQuery(withError, 'B');
    expect(panelDataB?.series.length).toBe(3);
    expect(panelDataB?.series[0].refId).toBe('B');
    expect(panelDataB?.state).toBe(LoadingState.Error);

    const panelDataA = filterPanelDataToQuery(withError, 'A');
    expect(panelDataA?.series.length).toBe(1);
    expect(panelDataA?.series[0].refId).toBe('A');
    expect(panelDataA?.state).toBe(LoadingState.Done);
  });

  it('should return error for query that returns no data, but another query does return data', () => {
    const withError = {
      ...data,
      state: LoadingState.Error,
      error: {
        message: 'Sad',
        refId: 'Q',
      },
    };

    const panelDataB = filterPanelDataToQuery(withError, 'Q');
    expect(panelDataB?.series.length).toBe(0);
    expect(panelDataB?.error?.refId).toBe('Q');
  });

  it('should not set the state to done if the frame is loading and has no errors', () => {
    const loadingData: PanelData = {
      state: LoadingState.Loading,
      series: [
        toDataFrame({ refId: 'A', fields: [{ name: 'AAA' }], meta: {} }),
        toDataFrame({ refId: 'B', fields: [{ name: 'B111' }], meta: {} }),
      ],
      timeRange: { from: dateTime(), to: dateTime(), raw: { from: 'now-1d', to: 'now' } },
    };

    const panelDataB = filterPanelDataToQuery(loadingData, 'B');
    expect(panelDataB?.state).toBe(LoadingState.Loading);

    const panelDataA = filterPanelDataToQuery(loadingData, 'A');
    expect(panelDataA?.state).toBe(LoadingState.Loading);
  });
});