import { of } from 'rxjs';

import {
  FieldType,
  LoadingState,
  PanelData,
  VariableSupportType,
  getDefaultTimeRange,
  toDataFrame,
} from '@grafana/data';
import { getPanelPlugin } from '@grafana/data/test/__mocks__/pluginMocks';
import { setPluginImportUtils, setRunRequest } from '@grafana/runtime';
import {
  SceneVariableSet,
  CustomVariable,
  SceneGridItem,
  SceneGridLayout,
  VizPanel,
  AdHocFiltersVariable,
} from '@grafana/scenes';
import { mockDataSource } from 'app/features/alerting/unified/mocks';
import { LegacyVariableQueryEditor } from 'app/features/variables/editor/LegacyVariableQueryEditor';

import { DashboardScene } from '../scene/DashboardScene';
import { activateFullSceneTree } from '../utils/test-utils';

import { VariablesEditView } from './VariablesEditView';

setPluginImportUtils({
  importPanelPlugin: (id: string) => Promise.resolve(getPanelPlugin({})),
  getPanelPluginFromCache: (id: string) => undefined,
});

const defaultDatasource = mockDataSource({
  name: 'Default Test Data Source',
  type: 'test',
});

const promDatasource = mockDataSource({
  name: 'Prometheus',
  type: 'prometheus',
});

jest.mock('@grafana/runtime/src/services/dataSourceSrv', () => ({
  ...jest.requireActual('@grafana/runtime/src/services/dataSourceSrv'),
  getDataSourceSrv: () => ({
    get: async () => ({
      ...defaultDatasource,
      variables: {
        getType: () => VariableSupportType.Custom,
        query: jest.fn(),
        editor: jest.fn().mockImplementation(LegacyVariableQueryEditor),
      },
    }),
    getList: () => [defaultDatasource, promDatasource],
    getInstanceSettings: () => ({ ...defaultDatasource }),
  }),
}));

const runRequestMock = jest.fn().mockReturnValue(
  of<PanelData>({
    state: LoadingState.Done,
    series: [
      toDataFrame({
        fields: [{ name: 'text', type: FieldType.string, values: ['val1', 'val2', 'val11'] }],
      }),
    ],
    timeRange: getDefaultTimeRange(),
  })
);

setRunRequest(runRequestMock);

describe('VariablesEditView', () => {
  describe('Dashboard Variables state', () => {
    let dashboard: DashboardScene;
    let variableView: VariablesEditView;

    beforeEach(async () => {
      const result = await buildTestScene();
      dashboard = result.dashboard;
      variableView = result.variableView;
    });

    it('should return the correct urlKey', () => {
      expect(variableView.getUrlKey()).toBe('variables');
    });

    it('should return the dashboard', () => {
      expect(variableView.getDashboard()).toBe(dashboard);
    });

    it('should return the list of variables', () => {
      const expectedVariables = [
        {
          type: 'custom',
          name: 'customVar',
          query: 'test, test2',
          value: 'test',
        },
        {
          type: 'custom',
          name: 'customVar2',
          query: 'test3, test4, $customVar',
          value: 'test3',
        },
        {
          type: 'adhoc',
          name: 'adhoc',
        },
      ];
      const variables = variableView.getVariables();
      expect(variables).toHaveLength(3);
      expect(variables[0].state).toMatchObject(expectedVariables[0]);
      expect(variables[1].state).toMatchObject(expectedVariables[1]);
      expect(variables[2].state).toMatchObject(expectedVariables[2]);
    });
  });

  describe('Dashboard Variables actions', () => {
    let variableView: VariablesEditView;

    beforeEach(async () => {
      const result = await buildTestScene();
      variableView = result.variableView;
    });

    it('should duplicate a variable', () => {
      const variables = variableView.getVariables();
      const variable = variables[0];
      variableView.onDuplicated(variable.state.name);
      expect(variableView.getVariables()).toHaveLength(4);
      expect(variableView.getVariables()[1].state.name).toBe('copy_of_customVar');
    });

    it('should handle name when duplicating a variable twice', () => {
      const variableIdentifier = 'customVar';
      variableView.onDuplicated(variableIdentifier);
      variableView.onDuplicated(variableIdentifier);
      expect(variableView.getVariables()).toHaveLength(5);
      expect(variableView.getVariables()[1].state.name).toBe('copy_of_customVar_1');
      expect(variableView.getVariables()[2].state.name).toBe('copy_of_customVar');
    });

    it('should delete a variable', () => {
      const variableIdentifier = 'customVar';
      variableView.onDelete(variableIdentifier);
      expect(variableView.getVariables()).toHaveLength(2);
      expect(variableView.getVariables()[0].state.name).toBe('customVar2');
    });

    it('should change order of variables', () => {
      const fromIndex = 0; // customVar is first
      const toIndex = 1;
      variableView.onOrderChanged(fromIndex, toIndex);
      expect(variableView.getVariables()[0].state.name).toBe('customVar2');
      expect(variableView.getVariables()[1].state.name).toBe('customVar');
    });

    it('should keep the same order of variables with invalid indexes', () => {
      const fromIndex = 0;
      const toIndex = 3;

      const errorSpy = jest.spyOn(console, 'error').mockImplementation(() => {});

      variableView.onOrderChanged(fromIndex, toIndex);
      expect(errorSpy).toHaveBeenCalledTimes(1);
      expect(variableView.getVariables()[0].state.name).toBe('customVar');
      expect(variableView.getVariables()[1].state.name).toBe('customVar2');

      errorSpy.mockRestore();
    });

    it('should change the variable type creating a new variable object', () => {
      const previousVariable = variableView.getVariables()[1] as CustomVariable;
      variableView.onEdit('customVar2');

      variableView.onTypeChange('adhoc');
      expect(variableView.getVariables()).toHaveLength(3);
      const variable = variableView.getVariables()[1];
      expect(variable).not.toBe(previousVariable);
      expect(variable.state.type).toBe('adhoc');

      // Values to be kept between the old and new variable
      expect(variable.state.name).toEqual(previousVariable.state.name);
      expect(variable.state.label).toEqual(previousVariable.state.label);
    });

    it('should reset editing variable when going back', () => {
      variableView.onEdit('customVar2');
      expect(variableView.state.editIndex).toBe(1);

      variableView.onGoBack();
      expect(variableView.state.editIndex).toBeUndefined();
    });

    it('should add default new query variable when onAdd is called', () => {
      variableView.onAdd();
      expect(variableView.getVariables()).toHaveLength(4);
      expect(variableView.getVariables()[3].state.name).toBe('query0');
      expect(variableView.getVariables()[3].state.type).toBe('query');
    });

    afterEach(() => {
      jest.clearAllMocks();
    });
  });

  describe('Dashboard Variables dependencies', () => {
    let variableView: VariablesEditView;
    let dashboard: DashboardScene;

    beforeEach(async () => {
      const result = await buildTestScene();
      variableView = result.variableView;
      dashboard = result.dashboard;
    });

    // FIXME: This is not working because the variable is replaced or it is not resolved yet
    it.skip('should keep dependencies between variables the type is changed so the variable is replaced', () => {
      // Uses function to avoid store reference to previous existing variables
      const getSourceVariable = () => variableView.getVariables()[0] as CustomVariable;
      const getDependantVariable = () => variableView.getVariables()[1] as CustomVariable;

      expect(getSourceVariable().getValue()).toBe('test');
      // Using getOptionsForSelect to get the interpolated values
      expect(getDependantVariable().getOptionsForSelect()[2].label).toBe('test');

      variableView.onEdit(getSourceVariable().state.name);
      // Simulating changing the type and update the value
      variableView.onTypeChange('constant');
      getSourceVariable().setState({ value: 'newValue' });

      expect(getSourceVariable().getValue()).toBe('newValue');
      expect(getDependantVariable().getOptionsForSelect()[2].label).toBe('newValue');
    });

    it('should keep dependencies with panels when the type is changed so the variable is replaced', async () => {
      // Uses function to avoid store reference to previous existing variables
      const getSourceVariable = () => variableView.getVariables()[0] as CustomVariable;
      const getDependantPanel = () =>
        ((dashboard.state.body as SceneGridLayout).state.children[0] as SceneGridItem).state.body as VizPanel;

      expect(getSourceVariable().getValue()).toBe('test');
      // Using description to get the interpolated value
      expect(getDependantPanel().getDescription()).toContain('Panel A depends on customVar with current value test');

      variableView.onEdit(getSourceVariable().state.name);
      // Simulating changing the type and update the value
      variableView.onTypeChange('constant');
      getSourceVariable().setState({ value: 'newValue' });

      expect(getSourceVariable().getValue()).toBe('newValue');
      expect(getDependantPanel().getDescription()).toContain('newValue');
    });
  });
});

async function buildTestScene() {
  const variableView = new VariablesEditView({});
  const dashboard = new DashboardScene({
    title: 'Dashboard with variables',
    uid: 'dash-variables',
    meta: {
      canEdit: true,
    },
    $variables: new SceneVariableSet({
      variables: [
        new CustomVariable({
          name: 'customVar',
          query: 'test, test2',
          value: 'test',
          text: 'test',
        }),
        new CustomVariable({
          name: 'customVar2',
          query: 'test3, test4, $customVar',
          value: '$customVar',
          text: '$customVar',
        }),
        new AdHocFiltersVariable({
          type: 'adhoc',
          name: 'adhoc',
          filters: [
            {
              key: 'test',
              operator: '=',
              value: 'testValue',
            },
          ],
        }),
      ],
    }),
    body: new SceneGridLayout({
      children: [
        new SceneGridItem({
          key: 'griditem-1',
          x: 0,
          body: new VizPanel({
            title: 'Panel A',
            description: 'Panel A depends on customVar with current value $customVar',
            key: 'panel-1',
            pluginId: 'table',
          }),
        }),
      ],
    }),
    editview: variableView,
  });

  activateFullSceneTree(dashboard);

  await new Promise((r) => setTimeout(r, 1));

  dashboard.onEnterEditMode();
  variableView.activate();

  return { dashboard, variableView };
}
