import { DataQuery, DefaultTimeZone, EventBusExtended, serializeStateToUrlParam, toUtc } from '@grafana/data';
import { ExploreId } from 'app/types';
import { refreshExplore } from './explorePane';
import { setDataSourceSrv } from '@grafana/runtime';
import { configureStore } from '../../../store/configureStore';
import { of } from 'rxjs';

jest.mock('../../dashboard/services/TimeSrv', () => ({
  getTimeSrv: jest.fn().mockReturnValue({
    init: jest.fn(),
  }),
}));

const t = toUtc();
const testRange = {
  from: t,
  to: t,
  raw: {
    from: t,
    to: t,
  },
};

const defaultInitialState = {
  user: {
    orgId: '1',
    timeZone: DefaultTimeZone,
  },
  explore: {
    [ExploreId.left]: {
      initialized: true,
      containerWidth: 1920,
      eventBridge: {} as EventBusExtended,
      queries: [] as DataQuery[],
      range: testRange,
      refreshInterval: {
        label: 'Off',
        value: 0,
      },
      cache: [],
    },
  },
};

function setupStore(state?: any) {
  return configureStore({
    ...defaultInitialState,
    explore: {
      [ExploreId.left]: {
        ...defaultInitialState.explore[ExploreId.left],
        ...(state || {}),
      },
    },
  } as any);
}

function setup(state?: any) {
  const datasources: Record<string, any> = {
    newDs: {
      testDatasource: jest.fn(),
      init: jest.fn(),
      query: jest.fn(),
      name: 'newDs',
      meta: { id: 'newDs' },
    },
    someDs: {
      testDatasource: jest.fn(),
      init: jest.fn(),
      query: jest.fn(),
      name: 'someDs',
      meta: { id: 'someDs' },
    },
  };

  setDataSourceSrv({
    getList() {
      return Object.values(datasources).map((d) => ({ name: d.name }));
    },
    getInstanceSettings(name: string) {
      return { name: 'hello' };
    },
    get(name?: string) {
      return Promise.resolve(
        name
          ? datasources[name]
          : {
              testDatasource: jest.fn(),
              init: jest.fn(),
              name: 'default',
            }
      );
    },
  } as any);

  const store = setupStore({
    datasourceInstance: datasources.someDs,
    ...(state || {}),
  });

  return {
    store,
    datasources,
  };
}

describe('refreshExplore', () => {
  it('should change data source when datasource in url changes', async () => {
    const { store } = setup();
    await store.dispatch(
      refreshExplore(ExploreId.left, serializeStateToUrlParam({ datasource: 'newDs', queries: [], range: testRange }))
    );
    expect(store.getState().explore[ExploreId.left].datasourceInstance?.name).toBe('newDs');
  });

  it('should change and run new queries from the URL', async () => {
    const { store, datasources } = setup();
    datasources.someDs.query.mockReturnValueOnce(of({}));
    await store.dispatch(
      refreshExplore(
        ExploreId.left,
        serializeStateToUrlParam({ datasource: 'someDs', queries: [{ expr: 'count()' }], range: testRange })
      )
    );
    // same
    const state = store.getState().explore[ExploreId.left];
    expect(state.datasourceInstance?.name).toBe('someDs');
    expect(state.queries.length).toBe(1);
    expect(state.queries).toMatchObject([{ expr: 'count()' }]);
    expect(datasources.someDs.query).toHaveBeenCalledTimes(1);
  });

  it('should not do anything if pane is not initialized', async () => {
    const { store } = setup({
      initialized: false,
    });
    const state = store.getState();
    await store.dispatch(
      refreshExplore(
        ExploreId.left,
        serializeStateToUrlParam({ datasource: 'newDs', queries: [{ expr: 'count()' }], range: testRange })
      )
    );

    expect(state).toEqual(store.getState());
  });
});
