import React from 'react';
import { render, screen, fireEvent, waitFor } from '@testing-library/react';
import Wrapper from './Wrapper';
import { configureStore } from '../../store/configureStore';
import { Provider } from 'react-redux';
import { store } from '../../store/store';
import { setDataSourceSrv } from '@grafana/runtime';
import {
  ArrayDataFrame,
  DataQueryResponse,
  DataSourceApi,
  DataSourceInstanceSettings,
  FieldType,
  QueryEditorProps,
  ScopedVars,
} from '@grafana/data';
import { selectors } from '@grafana/e2e-selectors';

import { setTimeSrv } from '../dashboard/services/TimeSrv';
import { from, Observable } from 'rxjs';
import { updateLocation } from '../../core/reducers/location';
import { LokiDatasource } from '../../plugins/datasource/loki/datasource';
import { LokiQuery } from '../../plugins/datasource/loki/types';
import { fromPairs } from 'lodash';

type Mock = jest.Mock;

jest.mock('react-virtualized-auto-sizer', () => {
  return {
    __esModule: true,
    default: (props: any) => <div>{props.children({ width: 1000 })}</div>,
  };
});

describe('Wrapper', () => {
  it('shows warning if there are no data sources', async () => {
    setup({ datasources: [] });
    // Will throw if isn't found
    screen.getByText(/Explore requires at least one data source/i);
  });

  it('inits url and renders editor but does not call query on empty url', async () => {
    const { datasources } = setup();

    // Wait for rendering the editor
    await screen.findByText(/Editor/i);

    // At this point url should be initialised to some defaults
    expect(store.getState().location.query).toEqual({
      orgId: '1',
      left: JSON.stringify(['now-1h', 'now', 'loki', {}]),
    });
    expect(datasources.loki.query).not.toBeCalled();
  });

  it('runs query when url contains query and renders results', async () => {
    const query = { left: JSON.stringify(['now-1h', 'now', 'loki', { expr: '{ label="value"}' }]) };
    const { datasources } = setup({ query });
    (datasources.loki.query as Mock).mockReturnValueOnce(makeLogsQueryResponse());

    // Make sure we render the logs panel
    await screen.findByText(/^Logs$/i);

    // Make sure we render the log line
    await screen.findByText(/custom log line/i);

    // And that the editor gets the expr from the url
    await screen.findByText(`loki Editor input: { label="value"}`);

    // We did not change the url
    expect(store.getState().location.query).toEqual({
      orgId: '1',
      ...query,
    });

    expect(store.getState().explore.richHistory[0]).toMatchObject({
      datasourceId: '1',
      datasourceName: 'loki',
      queries: [{ expr: '{ label="value"}' }],
    });

    // We called the data source query method once
    expect(datasources.loki.query).toBeCalledTimes(1);
    expect((datasources.loki.query as Mock).mock.calls[0][0]).toMatchObject({
      targets: [{ expr: '{ label="value"}' }],
    });
  });

  it('handles url change and runs the new query', async () => {
    const query = { left: JSON.stringify(['now-1h', 'now', 'loki', { expr: '{ label="value"}' }]) };
    const { datasources } = setup({ query });
    (datasources.loki.query as Mock).mockReturnValueOnce(makeLogsQueryResponse());
    // Wait for rendering the logs
    await screen.findByText(/custom log line/i);

    (datasources.loki.query as Mock).mockReturnValueOnce(makeLogsQueryResponse('different log'));
    store.dispatch(
      updateLocation({
        path: '/explore',
        query: { left: JSON.stringify(['now-1h', 'now', 'loki', { expr: '{ label="different"}' }]) },
      })
    );

    // Editor renders the new query
    await screen.findByText(`loki Editor input: { label="different"}`);
    // Renders new response
    await screen.findByText(/different log/i);
  });

  it('handles url change and runs the new query with different datasource', async () => {
    const query = { left: JSON.stringify(['now-1h', 'now', 'loki', { expr: '{ label="value"}' }]) };
    const { datasources } = setup({ query });
    (datasources.loki.query as Mock).mockReturnValueOnce(makeLogsQueryResponse());
    // Wait for rendering the logs
    await screen.findByText(/custom log line/i);
    await screen.findByText(`loki Editor input: { label="value"}`);

    (datasources.elastic.query as Mock).mockReturnValueOnce(makeMetricsQueryResponse());
    store.dispatch(
      updateLocation({
        path: '/explore',
        query: { left: JSON.stringify(['now-1h', 'now', 'elastic', { expr: 'other query' }]) },
      })
    );

    // Editor renders the new query
    await screen.findByText(`elastic Editor input: other query`);
    // Renders graph
    await screen.findByText(/Graph/i);
  });

  it('handles changing the datasource manually', async () => {
    const query = { left: JSON.stringify(['now-1h', 'now', 'loki', { expr: '{ label="value"}' }]) };
    const { datasources } = setup({ query });
    (datasources.loki.query as Mock).mockReturnValueOnce(makeLogsQueryResponse());
    // Wait for rendering the editor
    await screen.findByText(/Editor/i);
    await changeDatasource('elastic');

    await screen.findByText('elastic Editor input:');
    expect(datasources.elastic.query).not.toBeCalled();
    expect(store.getState().location.query).toEqual({
      orgId: '1',
      left: JSON.stringify(['now-1h', 'now', 'elastic', {}]),
    });
  });

  it('opens the split pane', async () => {
    const { datasources } = setup();
    // Wait for rendering the editor
    const splitButton = await screen.findByText(/split/i);
    fireEvent.click(splitButton);
    const editors = await screen.findAllByText('loki Editor input:');

    expect(editors.length).toBe(2);
    expect(datasources.loki.query).not.toBeCalled();
  });

  it('inits with two panes if specified in url', async () => {
    const query = {
      left: JSON.stringify(['now-1h', 'now', 'loki', { expr: '{ label="value"}' }]),
      right: JSON.stringify(['now-1h', 'now', 'elastic', { expr: 'error' }]),
    };

    const { datasources } = setup({ query });
    (datasources.loki.query as Mock).mockReturnValueOnce(makeLogsQueryResponse());
    (datasources.elastic.query as Mock).mockReturnValueOnce(makeLogsQueryResponse());

    // Make sure we render the logs panel
    await waitFor(() => {
      const logsPanels = screen.getAllByText(/^Logs$/i);
      expect(logsPanels.length).toBe(2);
    });

    // Make sure we render the log line
    const logsLines = await screen.findAllByText(/custom log line/i);
    expect(logsLines.length).toBe(2);

    // And that the editor gets the expr from the url
    await screen.findByText(`loki Editor input: { label="value"}`);
    await screen.findByText(`elastic Editor input: error`);

    // We did not change the url
    expect(store.getState().location.query).toEqual({
      orgId: '1',
      ...query,
    });

    // We called the data source query method once
    expect(datasources.loki.query).toBeCalledTimes(1);
    expect((datasources.loki.query as Mock).mock.calls[0][0]).toMatchObject({
      targets: [{ expr: '{ label="value"}' }],
    });

    expect(datasources.elastic.query).toBeCalledTimes(1);
    expect((datasources.elastic.query as Mock).mock.calls[0][0]).toMatchObject({
      targets: [{ expr: 'error' }],
    });
  });
});

type DatasourceSetup = { settings: DataSourceInstanceSettings; api: DataSourceApi };
type SetupOptions = {
  datasources?: DatasourceSetup[];
  query?: any;
};
function setup(options?: SetupOptions): { datasources: { [name: string]: DataSourceApi } } {
  // Clear this up otherwise it persists data source selection
  // TODO: probably add test for that too
  window.localStorage.clear();

  // Create this here so any mocks are recreated on setup and don't retain state
  const defaultDatasources: DatasourceSetup[] = [
    makeDatasourceSetup(),
    makeDatasourceSetup({ name: 'elastic', id: 2 }),
  ];

  const dsSettings = options?.datasources || defaultDatasources;

  setDataSourceSrv({
    getExternal(): DataSourceInstanceSettings[] {
      return dsSettings.map(d => d.settings);
    },

    get(name?: string | null, scopedVars?: ScopedVars): Promise<DataSourceApi> {
      return Promise.resolve((name ? dsSettings.find(d => d.api.name === name) : dsSettings[0])!.api);
    },
  } as any);

  setTimeSrv({
    init() {},
    getValidIntervals(intervals: string[]): string[] {
      return intervals;
    },
  } as any);

  configureStore();
  store.getState().user = {
    orgId: 1,
    timeZone: 'utc',
  };

  if (options?.query) {
    // We have to dispatch cause right now we take the url state from the action not from the store
    store.dispatch(updateLocation({ query: options.query, path: '/explore' }));
  }

  render(
    <Provider store={store}>
      <Wrapper />
    </Provider>
  );
  return { datasources: fromPairs(dsSettings.map(d => [d.api.name, d.api])) };
}

function makeDatasourceSetup({ name = 'loki', id = 1 }: { name?: string; id?: number } = {}): DatasourceSetup {
  const meta: any = {
    info: {
      logos: {
        small: '',
      },
    },
    id: id.toString(),
  };
  return {
    settings: {
      id,
      uid: name,
      type: 'logs',
      name,
      meta,
      jsonData: {},
    },
    api: {
      components: {
        QueryEditor: (props: QueryEditorProps<LokiDatasource, LokiQuery>) => (
          <div>
            {name} Editor input: {props.query.expr}
          </div>
        ),
      },
      name: name,
      query: jest.fn(),
      meta,
    } as any,
  };
}

function makeLogsQueryResponse(marker = ''): Observable<DataQueryResponse> {
  const df = new ArrayDataFrame([{ ts: Date.now(), line: `custom log line ${marker}` }]);
  df.meta = {
    preferredVisualisationType: 'logs',
  };
  df.fields[0].type = FieldType.time;
  return from([{ data: [df] }]);
}

function makeMetricsQueryResponse(): Observable<DataQueryResponse> {
  const df = new ArrayDataFrame([{ ts: Date.now(), val: 1 }]);
  df.fields[0].type = FieldType.time;
  return from([{ data: [df] }]);
}

async function changeDatasource(name: string) {
  const datasourcePicker = (await screen.findByLabelText(selectors.components.DataSourcePicker.container)).children[0];
  fireEvent.keyDown(datasourcePicker, { keyCode: 40 });
  const option = screen.getByText(name);
  fireEvent.click(option);
}