import { act, fireEvent, screen, waitFor } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import React, { ComponentProps } from 'react';
import AutoSizer from 'react-virtualized-auto-sizer';

import { serializeStateToUrlParam } from '@grafana/data';

import { makeLogsQueryResponse } from './spec/helper/query';
import { setupExplore, tearDown, waitForExplore } from './spec/helper/setup';
import * as mainState from './state/main';

jest.mock('app/core/core', () => {
  return {
    contextSrv: {
      hasPermission: () => true,
      hasAccess: () => true,
    },
    appEvents: {
      subscribe: () => {},
      publish: () => {},
    },
  };
});

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

const fetch = jest.fn().mockResolvedValue({ correlations: [] });
jest.mock('@grafana/runtime', () => ({
  ...jest.requireActual('@grafana/runtime'),
  getBackendSrv: () => ({ fetch }),
}));

jest.mock('rxjs', () => ({
  ...jest.requireActual('rxjs'),
  lastValueFrom: () =>
    new Promise((resolve, reject) => {
      resolve({ data: { correlations: [] } });
    }),
}));

describe('ExplorePage', () => {
  afterEach(() => {
    tearDown();
  });

  describe('Handles open/close splits and related events in UI and URL', () => {
    it('opens the split pane when split button is clicked', async () => {
      const { location } = setupExplore();

      await waitFor(() => {
        const editors = screen.getAllByText('loki Editor input:');
        expect(editors.length).toBe(1);

        // initializing explore replaces the first history entry
        expect(location.getHistory().length).toBe(1);
        expect(location.getHistory().action).toBe('REPLACE');
      });

      // Wait for rendering the editor
      const splitButton = await screen.findByRole('button', { name: /split/i });
      await userEvent.click(splitButton);
      await waitFor(() => {
        const editors = screen.getAllByText('loki Editor input:');
        expect(editors.length).toBe(2);
        // a new entry is pushed to the history
        expect(location.getHistory().length).toBe(2);
      });

      act(() => {
        location.getHistory().goBack();
      });

      await waitFor(() => {
        const editors = screen.getAllByText('loki Editor input:');
        expect(editors.length).toBe(1);
        // going back pops the history
        expect(location.getHistory().action).toBe('POP');
        expect(location.getHistory().length).toBe(2);
      });

      act(() => {
        location.getHistory().goForward();
      });

      await waitFor(() => {
        const editors = screen.getAllByText('loki Editor input:');
        expect(editors.length).toBe(2);
        // going forward pops the history
        expect(location.getHistory().action).toBe('POP');
        expect(location.getHistory().length).toBe(2);
      });
    });

    it('inits with two panes if specified in url', async () => {
      const urlParams = {
        left: serializeStateToUrlParam({
          datasource: 'loki-uid',
          queries: [{ refId: 'A', expr: '{ label="value"}', datasource: { type: 'logs', uid: 'loki-uid' } }],
          range: { from: 'now-1h', to: 'now' },
        }),
        right: serializeStateToUrlParam({
          datasource: 'elastic-uid',
          queries: [{ refId: 'A', expr: 'error', datasource: { type: 'logs', uid: 'elastic-uid' } }],
          range: { from: 'now-1h', to: 'now' },
        }),
        orgId: '1',
      };

      const { datasources } = setupExplore({ urlParams });
      jest.mocked(datasources.loki.query).mockReturnValueOnce(makeLogsQueryResponse());
      jest.mocked(datasources.elastic.query).mockReturnValueOnce(makeLogsQueryResponse());

      // Make sure we render the logs panel
      await waitFor(() => {
        const logsPanels = screen.getAllByText(/^Logs$/);
        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
      expect(screen.getByText(`loki Editor input: { label="value"}`)).toBeInTheDocument();
      expect(screen.getByText(`elastic Editor input: error`)).toBeInTheDocument();

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

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

    // TODO: the following tests are using the compact format, we should use the current format instead
    // and have a dedicated test ensuring the compact format is parsed correctly
    it('can close a panel from a split', async () => {
      const urlParams = {
        left: JSON.stringify(['now-1h', 'now', 'loki', { refId: 'A' }]),
        right: JSON.stringify(['now-1h', 'now', 'elastic', { refId: 'A' }]),
      };
      const { location } = setupExplore({ urlParams });
      let closeButtons = await screen.findAllByLabelText(/Close split pane/i);
      await userEvent.click(closeButtons[1]);

      expect(location.getHistory().length).toBe(1);

      await waitFor(() => {
        closeButtons = screen.queryAllByLabelText(/Close split pane/i);
        expect(closeButtons.length).toBe(0);
        // Closing a pane using the split close button causes a new entry to be pushed in the history
        expect(location.getHistory().length).toBe(2);
      });
    });

    it('handles opening split with split open func', async () => {
      const urlParams = {
        left: JSON.stringify(['now-1h', 'now', 'loki', { expr: '{ label="value"}' }]),
      };
      const { datasources, store } = setupExplore({ urlParams });
      jest.mocked(datasources.loki.query).mockReturnValue(makeLogsQueryResponse());
      jest.mocked(datasources.elastic.query).mockReturnValue(makeLogsQueryResponse());

      // Wait for the left pane to render
      await waitFor(async () => {
        expect(await screen.findByText(`loki Editor input: { label="value"}`)).toBeInTheDocument();
      });

      act(() => {
        store.dispatch(mainState.splitOpen({ datasourceUid: 'elastic', query: { expr: 'error', refId: 'A' } }));
      });

      // Editor renders the new query
      expect(await screen.findByText(`elastic Editor input: error`)).toBeInTheDocument();
      expect(await screen.findByText(`loki Editor input: { label="value"}`)).toBeInTheDocument();
    });

    it('handles split size events and sets relevant variables', async () => {
      setupExplore();

      const splitButton = await screen.findByText(/split/i);
      await userEvent.click(splitButton);
      await waitForExplore('left');

      expect(await screen.findAllByLabelText('Widen pane')).toHaveLength(2);
      expect(screen.queryByLabelText('Narrow pane')).not.toBeInTheDocument();

      const panes = screen.getAllByRole('main');

      expect(Number.parseInt(getComputedStyle(panes[0]).width, 10)).toBe(1000);
      expect(Number.parseInt(getComputedStyle(panes[1]).width, 10)).toBe(1000);
      const resizer = screen.getByRole('presentation');

      fireEvent.mouseDown(resizer, { buttons: 1 });
      fireEvent.mouseMove(resizer, { clientX: -700, buttons: 1 });
      fireEvent.mouseUp(resizer);

      expect(await screen.findAllByLabelText('Widen pane')).toHaveLength(1);
      expect(await screen.findAllByLabelText('Narrow pane')).toHaveLength(1);
    });
  });
});