/**
 * Copyright (c) 2020-present, Goldman Sachs
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import React, { useState, useEffect, useCallback, useRef } from 'react';
import { observer } from 'mobx-react-lite';
import {
  FunctionEditorState,
  FUNCTION_EDITOR_TAB,
} from '../../../../stores/editor/editor-state/element-editor-state/FunctionEditorState.js';
import {
  CORE_DND_TYPE,
  type UMLEditorElementDropTarget,
  type ElementDragSource,
} from '../../../../stores/editor/utils/DnDUtils.js';
import {
  assertErrorThrown,
  assertTrue,
  prettyCONSTName,
  returnUndefOnError,
  UnsupportedOperationError,
} from '@finos/legend-shared';
import { useDrag, useDrop } from 'react-dnd';
import {
  clsx,
  CustomSelectorInput,
  createFilter,
  LockIcon,
  PlusIcon,
  TimesIcon,
  ArrowCircleRightIcon,
  PanelEntryDragHandle,
  DragPreviewLayer,
  useDragPreviewLayer,
  Panel,
  PanelContent,
  PanelDnDEntry,
  Dialog,
  ModalBody,
  ModalFooter,
  CaretDownIcon,
  ControlledDropdownMenu,
  BlankPanelContent,
  MenuContent,
  MenuContentItem,
  Modal,
  PauseCircleIcon,
  PlayIcon,
  PanelLoadingIndicator,
  PencilIcon,
  RocketIcon,
  ModalFooterButton,
  BaseCard,
  Snowflake_BrandIcon,
  InputWithInlineValidation,
  LongArrowRightIcon,
  CheckSquareIcon,
  SquareIcon,
  SinglestoreIcon,
} from '@finos/legend-art';
import { LEGEND_STUDIO_TEST_ID } from '../../../../__lib__/LegendStudioTesting.js';
import {
  StereotypeDragPreviewLayer,
  StereotypeSelector,
} from '../uml-editor/StereotypeSelector.js';
import {
  TaggedValueDragPreviewLayer,
  TaggedValueEditor,
} from '../uml-editor/TaggedValueEditor.js';
import { flowResult } from 'mobx';
import { useEditorStore } from '../../EditorStoreProvider.js';
import {
  type ConcreteFunctionDefinition,
  type StereotypeReference,
  type TaggedValue,
  type RawVariableExpression,
  Profile,
  MULTIPLICITY_INFINITE,
  Unit,
  Type,
  Enumeration,
  Class,
  PrimitiveType,
  StereotypeExplicitReference,
  stub_Tag,
  stub_Profile,
  stub_TaggedValue,
  stub_Stereotype,
  stub_RawVariableExpression,
  getFunctionNameWithPath,
  getFunctionSignature,
  RawExecutionResult,
  extractExecutionResultValues,
  RawLambda,
  DatabaseType,
  RelationalDatabaseConnection,
  type FunctionActivator,
  GenericType,
  requireTypeArugments,
  GenericTypeExplicitReference,
  CORE_PURE_PATH,
  TDSExecutionResult,
} from '@finos/legend-graph';
import {
  type ApplicationStore,
  type LegendApplicationPlugin,
  type LegendApplicationConfig,
  type LegendApplicationPluginManager,
  useApplicationNavigationContext,
  useApplicationStore,
  DEFAULT_TAB_SIZE,
} from '@finos/legend-application';
import {
  type PackageableElementOption,
  buildElementOption,
} from '@finos/legend-lego/graph-editor';
import { getElementIcon } from '../../../ElementIconUtils.js';
import {
  function_setReturnGenericType,
  function_setReturnMultiplicity,
  function_addParameter,
  function_deleteParameter,
  annotatedElement_addTaggedValue,
  annotatedElement_addStereotype,
  annotatedElement_deleteStereotype,
  annotatedElement_deleteTaggedValue,
  function_swapParameters,
} from '../../../../stores/graph-modifier/DomainGraphModifierHelper.js';
import {
  rawVariableExpression_setMultiplicity,
  rawVariableExpression_setName,
  rawVariableExpression_setType,
} from '../../../../stores/graph-modifier/RawValueSpecificationGraphModifierHelper.js';
import { LEGEND_STUDIO_APPLICATION_NAVIGATION_CONTEXT_KEY } from '../../../../__lib__/LegendStudioApplicationNavigationContext.js';
import {
  type QueryBuilderState,
  ExecutionPlanViewer,
  LineageViewer,
  FunctionQueryBuilderState,
  getTDSColumnCustomizations,
  LambdaEditor,
  LambdaParameterValuesEditor,
  QUERY_BUILDER_TEST_ID,
  QueryBuilderAdvancedWorkflowState,
  getRowDataFromExecutionResult,
} from '@finos/legend-query-builder';
import type { EditorStore } from '../../../../stores/editor/EditorStore.js';
import { graph_renameElement } from '../../../../stores/graph-modifier/GraphModifierHelper.js';
import { CODE_EDITOR_LANGUAGE } from '@finos/legend-code-editor';
import { CodeEditor } from '@finos/legend-lego/code-editor';
import { PanelGroupItemExperimentalBadge } from '../../panel-group/PanelGroup.js';
import type { FunctionActivatorState } from '../../../../stores/editor/editor-state/element-editor-state/FunctionActivatorState.js';
import { FunctionTestableEditor } from './testable/FunctionTestableEditor.js';
import { DocumentationLink } from '@finos/legend-lego/application';
import { LEGEND_STUDIO_DOCUMENTATION_KEY } from '../../../../__lib__/LegendStudioDocumentation.js';
import {
  DataGrid,
  type DataGridColumnDefinition,
} from '@finos/legend-lego/data-grid';

enum FUNCTION_PARAMETER_TYPE {
  CLASS = 'CLASS',
  ENUMERATION = 'ENUMERATION',
  PRIMITIVE = 'PRIMITIVE',
}

export enum FUNCTION_ACTIVATE_TYPE {
  SNOWFLAKE_NATIVE_APP = 'Snowflake UDTF',
  SNOWFLAKE_M2M_UDF = 'Snowflake M2M UDF',
  HOSTED_SERVICE = 'REST Service',
  MEM_SQL_FUNCTION = 'Mem SQL Function',
  SERVICE_JAR = 'Service JAR',
  REFINER = 'Refiner',
  BIG_QUERY_NATIVE_APP = 'BigQuery Native App',
}

const getFunctionParameterType = (type: Type): FUNCTION_PARAMETER_TYPE => {
  if (type instanceof PrimitiveType) {
    return FUNCTION_PARAMETER_TYPE.PRIMITIVE;
  } else if (type instanceof Enumeration) {
    return FUNCTION_PARAMETER_TYPE.ENUMERATION;
  } else if (type instanceof Class) {
    return FUNCTION_PARAMETER_TYPE.CLASS;
  }
  throw new UnsupportedOperationError(
    `Can't classify function parameter`,
    type,
  );
};

type FunctionParameterDragSource = {
  parameter: RawVariableExpression;
};

const FUNCTION_PARAMETER_DND_TYPE = 'FUNCTION_PARAMETER';

/**
 * NOTE: every time we update the function signature (parameters, return value), we need to adjust the function path,
 * therefore, we need to update the graph's function index.
 */
const updateFunctionName = (
  editorStore: EditorStore,
  applicationStore: ApplicationStore<
    LegendApplicationConfig,
    LegendApplicationPluginManager<LegendApplicationPlugin>
  >,
  func: ConcreteFunctionDefinition,
): void => {
  try {
    graph_renameElement(
      editorStore.graphManagerState.graph,
      func,
      `${getFunctionNameWithPath(func)}${getFunctionSignature(func)}`,
      editorStore.changeDetectionState.observerContext,
    );
  } catch (error) {
    assertErrorThrown(error);
    applicationStore.notificationService.notifyError(error);
  }
};

const ParameterBasicEditor = observer(
  (props: {
    parameter: RawVariableExpression;
    _func: ConcreteFunctionDefinition;
    deleteParameter: () => void;
    isReadOnly: boolean;
  }) => {
    const ref = useRef<HTMLDivElement>(null);
    const handleRef = useRef<HTMLDivElement>(null);

    const { parameter, _func, deleteParameter, isReadOnly } = props;
    const editorStore = useEditorStore();
    const applicationStore = useApplicationStore();
    // Name
    const changeValue: React.ChangeEventHandler<HTMLInputElement> = (event) =>
      rawVariableExpression_setName(parameter, event.target.value);
    // Type
    const [isEditingType, setIsEditingType] = useState(false);
    const typeOptions =
      editorStore.graphManagerState.usableClassPropertyTypes.map(
        buildElementOption,
      );
    const paramType = parameter.type.value;
    const typeName = getFunctionParameterType(paramType);
    const filterOption = createFilter({
      ignoreCase: true,
      ignoreAccents: false,
      stringify: (option: { data: PackageableElementOption<Type> }): string =>
        option.data.value.path,
    });
    const selectedType = { value: paramType, label: paramType.name };
    const changeType = (val: PackageableElementOption<Type>): void => {
      if (val.value !== parameter.type.value) {
        rawVariableExpression_setType(parameter, val.value);
        updateFunctionName(editorStore, applicationStore, _func);
      }
      setIsEditingType(false);
    };
    const openElement = (): void => {
      if (!(paramType instanceof PrimitiveType)) {
        editorStore.graphEditorMode.openElement(
          paramType instanceof Unit ? paramType.measure : paramType,
        );
      }
    };
    // Multiplicity
    const [lowerBound, setLowerBound] = useState<string | number>(
      parameter.multiplicity.lowerBound,
    );
    const [upperBound, setUpperBound] = useState<string | number>(
      parameter.multiplicity.upperBound ?? MULTIPLICITY_INFINITE,
    );
    const updateMultiplicity = (
      lower: number | string,
      upper: number | string,
    ): void => {
      const lBound = typeof lower === 'number' ? lower : parseInt(lower, 10);
      const uBound =
        upper === MULTIPLICITY_INFINITE
          ? undefined
          : typeof upper === 'number'
            ? upper
            : parseInt(upper, 10);
      if (!isNaN(lBound) && (uBound === undefined || !isNaN(uBound))) {
        rawVariableExpression_setMultiplicity(
          parameter,
          editorStore.graphManagerState.graph.getMultiplicity(lBound, uBound),
        );
        updateFunctionName(editorStore, applicationStore, _func);
      }
    };
    const changeLowerBound: React.ChangeEventHandler<HTMLInputElement> = (
      event,
    ) => {
      setLowerBound(event.target.value);
      updateMultiplicity(event.target.value, upperBound);
    };
    const changeUpperBound: React.ChangeEventHandler<HTMLInputElement> = (
      event,
    ) => {
      setUpperBound(event.target.value);
      updateMultiplicity(lowerBound, event.target.value);
    };

    // Drag and Drop
    const handleHover = useCallback(
      (item: FunctionParameterDragSource): void => {
        const draggingParameter = item.parameter;
        const hoveredParameter = parameter;
        function_swapParameters(_func, draggingParameter, hoveredParameter);
      },
      [_func, parameter],
    );

    const [{ isBeingDraggedParameter }, dropConnector] = useDrop<
      FunctionParameterDragSource,
      void,
      { isBeingDraggedParameter: RawVariableExpression | undefined }
    >(
      () => ({
        accept: [FUNCTION_PARAMETER_DND_TYPE],
        hover: (item) => handleHover(item),
        collect: (
          monitor,
        ): {
          isBeingDraggedParameter: RawVariableExpression | undefined;
        } => ({
          isBeingDraggedParameter:
            monitor.getItem<FunctionParameterDragSource | null>()?.parameter,
        }),
      }),
      [handleHover],
    );
    const isBeingDragged = parameter === isBeingDraggedParameter;

    const [, dragConnector, dragPreviewConnector] =
      useDrag<FunctionParameterDragSource>(
        () => ({
          type: FUNCTION_PARAMETER_DND_TYPE,
          item: () => ({
            parameter: parameter,
          }),
        }),
        [parameter],
      );
    dragConnector(handleRef);
    dropConnector(ref);
    useDragPreviewLayer(dragPreviewConnector);

    return (
      <PanelDnDEntry
        ref={ref}
        placeholder={<div className="dnd__placeholder--light"></div>}
        className="property-basic-editor__container"
        showPlaceholder={isBeingDragged}
      >
        <PanelEntryDragHandle
          dragSourceConnector={handleRef}
          isDragging={isBeingDragged}
        />
        <div className="property-basic-editor">
          {isReadOnly && (
            <div className="property-basic-editor__lock">
              <LockIcon />
            </div>
          )}
          <input
            className="property-basic-editor__name input--dark"
            disabled={isReadOnly}
            value={parameter.name}
            spellCheck={false}
            onChange={changeValue}
            placeholder="Parameter name"
          />
          {!isReadOnly && isEditingType && (
            <CustomSelectorInput
              className="property-basic-editor__type"
              options={typeOptions}
              onChange={changeType}
              value={selectedType}
              placeholder="Choose a type..."
              filterOption={filterOption}
              darkMode={
                !applicationStore.layoutService
                  .TEMPORARY__isLightColorThemeEnabled
              }
            />
          )}
          {!isReadOnly && !isEditingType && (
            <div
              className={clsx(
                'property-basic-editor__type',
                'property-basic-editor__type--show-click-hint',
                `background--${typeName.toLowerCase()}`,
                {
                  'property-basic-editor__type--has-visit-btn':
                    typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE,
                },
              )}
            >
              {typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE && (
                <div className="property-basic-editor__type__abbr">
                  {getElementIcon(paramType, editorStore)}
                </div>
              )}
              <div className="property-basic-editor__type__label">
                {paramType.name}
              </div>
              <div
                className="property-basic-editor__type__label property-basic-editor__type__label--hover"
                onClick={(): void => setIsEditingType(true)}
              >
                Click to edit
              </div>
              {typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE && (
                <button
                  data-testid={LEGEND_STUDIO_TEST_ID.TYPE_VISIT}
                  className="property-basic-editor__type__visit-btn"
                  onClick={openElement}
                  tabIndex={-1}
                  title="Visit element"
                >
                  <ArrowCircleRightIcon />
                </button>
              )}
            </div>
          )}
          {isReadOnly && (
            <div
              className={clsx(
                'property-basic-editor__type',
                `background--${typeName.toLowerCase()}`,
                {
                  'property-basic-editor__type--has-visit-btn':
                    typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE,
                },
              )}
            >
              {typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE && (
                <div className="property-basic-editor__type__abbr">
                  {getElementIcon(paramType, editorStore)}
                </div>
              )}
              <div className="property-basic-editor__type__label">
                {paramType.name}
              </div>
              {typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE && (
                <button
                  data-testid={LEGEND_STUDIO_TEST_ID.TYPE_VISIT}
                  className="property-basic-editor__type__visit-btn"
                  onClick={openElement}
                  tabIndex={-1}
                  title="Visit element"
                >
                  <ArrowCircleRightIcon />
                </button>
              )}
            </div>
          )}
          <div className="property-basic-editor__multiplicity">
            <input
              className="property-basic-editor__multiplicity-bound"
              disabled={isReadOnly}
              spellCheck={false}
              value={lowerBound}
              onChange={changeLowerBound}
            />
            <div className="property-basic-editor__multiplicity__range">..</div>
            <input
              className="property-basic-editor__multiplicity-bound"
              disabled={isReadOnly}
              spellCheck={false}
              value={upperBound}
              onChange={changeUpperBound}
            />
          </div>
          {!isReadOnly && (
            <button
              className="uml-element-editor__remove-btn btn--dark btn--caution"
              disabled={isReadOnly}
              onClick={deleteParameter}
              tabIndex={-1}
              title="Remove"
            >
              <TimesIcon />
            </button>
          )}
        </div>
      </PanelDnDEntry>
    );
  },
);

const ReturnTypeEditor = observer(
  (props: {
    functionElement: ConcreteFunctionDefinition;
    isReadOnly: boolean;
  }) => {
    const { functionElement, isReadOnly } = props;
    const { returnType, returnMultiplicity } = functionElement;
    const editorStore = useEditorStore();
    const applicationStore = useApplicationStore();
    // Type
    const [isEditingType, setIsEditingType] = useState(false);
    const typeOptions =
      editorStore.graphManagerState.usableClassPropertyTypes.map(
        buildElementOption,
      );
    const typeName = getFunctionParameterType(returnType.value.rawType);
    const filterOption = createFilter({
      ignoreCase: true,
      ignoreAccents: false,
      stringify: (option: { data: PackageableElementOption<Type> }): string =>
        option.data.value.path,
    });
    const selectedType = {
      value: returnType.value.rawType,
      label: returnType.value.rawType.name,
    };
    const changeType = (val: PackageableElementOption<Type>): void => {
      const value = val.value;
      const genericType = new GenericType(value);
      if (requireTypeArugments(value)) {
        genericType.typeArguments = [
          GenericTypeExplicitReference.create(
            new GenericType(
              editorStore.graphManagerState.graph.getType(CORE_PURE_PATH.ANY),
            ),
          ),
        ];
      }
      function_setReturnGenericType(functionElement, genericType);
      setIsEditingType(false);
      updateFunctionName(editorStore, applicationStore, functionElement);
    };

    const openElement = (): void => {
      if (!(returnType.value.rawType instanceof PrimitiveType)) {
        editorStore.graphEditorMode.openElement(
          returnType.value.rawType instanceof Unit
            ? returnType.value.rawType.measure
            : returnType.value.rawType,
        );
      }
    };
    // Multiplicity
    const [lowerBound, setLowerBound] = useState<string | number>(
      returnMultiplicity.lowerBound,
    );
    const [upperBound, setUpperBound] = useState<string | number>(
      returnMultiplicity.upperBound ?? MULTIPLICITY_INFINITE,
    );
    const updateMultiplicity = (
      lower: number | string,
      upper: number | string,
    ): void => {
      const lBound = typeof lower === 'number' ? lower : parseInt(lower, 10);
      const uBound =
        upper === MULTIPLICITY_INFINITE
          ? undefined
          : typeof upper === 'number'
            ? upper
            : parseInt(upper, 10);
      if (!isNaN(lBound) && (uBound === undefined || !isNaN(uBound))) {
        function_setReturnMultiplicity(
          functionElement,
          editorStore.graphManagerState.graph.getMultiplicity(lBound, uBound),
        );
        updateFunctionName(editorStore, applicationStore, functionElement);
      }
    };
    const changeLowerBound: React.ChangeEventHandler<HTMLInputElement> = (
      event,
    ) => {
      setLowerBound(event.target.value);
      updateMultiplicity(event.target.value, upperBound);
    };
    const changeUpperBound: React.ChangeEventHandler<HTMLInputElement> = (
      event,
    ) => {
      setUpperBound(event.target.value);
      updateMultiplicity(lowerBound, event.target.value);
    };

    return (
      <div className="function-editor__return__type-editor">
        {!isReadOnly && isEditingType && (
          <CustomSelectorInput
            className="property-basic-editor__type"
            options={typeOptions}
            onChange={changeType}
            value={selectedType}
            placeholder="Choose a type..."
            filterOption={filterOption}
            darkMode={
              !applicationStore.layoutService
                .TEMPORARY__isLightColorThemeEnabled
            }
          />
        )}
        {!isReadOnly && !isEditingType && (
          <div
            className={clsx(
              'property-basic-editor__type',
              'property-basic-editor__type--show-click-hint',
              `background--${typeName.toLowerCase()}`,
              {
                'property-basic-editor__type--has-visit-btn':
                  typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE,
              },
            )}
          >
            {typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE && (
              <div className="property-basic-editor__type__abbr">
                {getElementIcon(returnType.value.rawType, editorStore)}
              </div>
            )}
            <div className="property-basic-editor__type__label">
              {returnType.value.rawType.name}
            </div>
            <div
              className="property-basic-editor__type__label property-basic-editor__type__label--hover"
              onClick={(): void => setIsEditingType(true)}
            >
              Click to edit
            </div>
            {typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE && (
              <button
                data-testid={LEGEND_STUDIO_TEST_ID.TYPE_VISIT}
                className="property-basic-editor__type__visit-btn"
                onClick={openElement}
                tabIndex={-1}
                title="Visit element"
              >
                <ArrowCircleRightIcon />
              </button>
            )}
          </div>
        )}
        {isReadOnly && (
          <div
            className={clsx(
              'property-basic-editor__type',
              `background--${typeName.toLowerCase()}`,
              {
                'property-basic-editor__type--has-visit-btn':
                  typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE,
              },
            )}
          >
            {typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE && (
              <div className="property-basic-editor__type__abbr">
                {getElementIcon(returnType.value.rawType, editorStore)}
              </div>
            )}
            <div className="property-basic-editor__type__label">
              {returnType.value.rawType.name}
            </div>
            {typeName !== FUNCTION_PARAMETER_TYPE.PRIMITIVE && (
              <button
                data-testid={LEGEND_STUDIO_TEST_ID.TYPE_VISIT}
                className="property-basic-editor__type__visit-btn"
                onClick={openElement}
                tabIndex={-1}
                title="Visit element"
              >
                <ArrowCircleRightIcon />
              </button>
            )}
          </div>
        )}
        <div className="property-basic-editor__multiplicity">
          <input
            className="property-basic-editor__multiplicity-bound"
            disabled={isReadOnly}
            spellCheck={false}
            value={lowerBound}
            onChange={changeLowerBound}
          />
          <div className="property-basic-editor__multiplicity__range">..</div>
          <input
            className="property-basic-editor__multiplicity-bound"
            disabled={isReadOnly}
            spellCheck={false}
            value={upperBound}
            onChange={changeUpperBound}
          />
        </div>
        <button
          className="uml-element-editor__remove-btn btn--dark btn--caution"
          disabled={true}
          tabIndex={-1}
        >
          <TimesIcon />
        </button>
      </div>
    );
  },
);

const FunctionPromoteEditor = observer(
  (props: {
    functionElement: ConcreteFunctionDefinition;
    activatorPromoteState: FunctionActivatorState;
  }) => {
    const { functionElement, activatorPromoteState } = props;
    const applicationStore = useApplicationStore();
    const elementAlreadyExistsMessage =
      activatorPromoteState.functionEditorState.editorStore.graphManagerState.graph.allElements
        .map((s) => s.path)
        .includes(activatorPromoteState.activatorPath)
        ? 'Element with same path already exists'
        : undefined;
    let validationMessage = '';
    const closeModal = (): void => {
      activatorPromoteState.closeFunctionActivateModal();
      activatorPromoteState.setAcitvateType(undefined);
    };
    const promoteFunction = (): void => {
      flowResult(activatorPromoteState.activate(functionElement))
        .then(() => {
          activatorPromoteState.closeFunctionActivateModal();
        })
        .catch(applicationStore.alertUnhandledError);
    };
    const onTargetPathChange: React.ChangeEventHandler<HTMLInputElement> = (
      event,
    ) => {
      activatorPromoteState.updateActivatorPath(event.target.value);
    };
    const validateFunctionActivator = (type: string): boolean => {
      switch (type) {
        case FUNCTION_ACTIVATE_TYPE.SNOWFLAKE_NATIVE_APP: {
          const availableConnections =
            activatorPromoteState.functionEditorState.editorStore.graphManagerState.usableConnections.filter(
              (connection) =>
                connection.connectionValue instanceof
                  RelationalDatabaseConnection &&
                connection.connectionValue.type === DatabaseType.Snowflake,
            );
          if (availableConnections.length > 0) {
            return true;
          } else {
            validationMessage =
              'There is no available connection of type Snowflake';
          }
          return false;
        }
        case FUNCTION_ACTIVATE_TYPE.SNOWFLAKE_M2M_UDF: {
          const availableConnections =
            activatorPromoteState.functionEditorState.editorStore.graphManagerState.usableConnections.filter(
              (connection) =>
                connection.connectionValue instanceof
                  RelationalDatabaseConnection &&
                connection.connectionValue.type === DatabaseType.Snowflake,
            );
          if (availableConnections.length > 0) {
            return true;
          } else {
            validationMessage =
              'There is no available connection of type Snowflake';
          }
          return false;
        }
        case FUNCTION_ACTIVATE_TYPE.MEM_SQL_FUNCTION: {
          const availableConnections =
            activatorPromoteState.functionEditorState.editorStore.graphManagerState.usableConnections.filter(
              (connection) =>
                connection.connectionValue instanceof
                  RelationalDatabaseConnection &&
                connection.connectionValue.type === DatabaseType.MemSQL,
            );
          if (availableConnections.length > 0) {
            return true;
          } else {
            validationMessage =
              'There is no available connection of type MemSQL';
          }
          return false;
        }
        default:
          return true;
      }
    };
    const renderFunctionPromoteTypes = (type: string): React.ReactNode => {
      switch (type) {
        case FUNCTION_ACTIVATE_TYPE.SNOWFLAKE_NATIVE_APP:
          return (
            <BaseCard
              key={FUNCTION_ACTIVATE_TYPE.SNOWFLAKE_NATIVE_APP}
              cardMedia={
                <Snowflake_BrandIcon className="function-promote-editor__type-icon" />
              }
              cardName={type}
              cardContent="Deploy the function as a UDTF(user-defined table function) in snowflake"
              isActive={
                activatorPromoteState.activateType ===
                FUNCTION_ACTIVATE_TYPE.SNOWFLAKE_NATIVE_APP
              }
              onClick={() => {
                activatorPromoteState.setAcitvateType(type);
              }}
            />
          );
        case FUNCTION_ACTIVATE_TYPE.SNOWFLAKE_M2M_UDF:
          return (
            <BaseCard
              key={FUNCTION_ACTIVATE_TYPE.SNOWFLAKE_M2M_UDF}
              cardMedia={
                <Snowflake_BrandIcon className="function-promote-editor__type-icon" />
              }
              cardName={type}
              cardContent="Deploy the function as a UDF(user-defined function) in snowflake"
              isActive={
                activatorPromoteState.activateType ===
                FUNCTION_ACTIVATE_TYPE.SNOWFLAKE_M2M_UDF
              }
              onClick={() => {
                activatorPromoteState.setAcitvateType(type);
              }}
            />
          );
        case FUNCTION_ACTIVATE_TYPE.HOSTED_SERVICE:
          return (
            <BaseCard
              key={FUNCTION_ACTIVATE_TYPE.HOSTED_SERVICE}
              cardMedia={
                <RocketIcon className="function-promote-editor__type-icon" />
              }
              cardName={type}
              cardContent="Create a HostedService that will be deployed to a server environment and executed with a pattern"
              isActive={
                activatorPromoteState.activateType ===
                FUNCTION_ACTIVATE_TYPE.HOSTED_SERVICE
              }
              onClick={() => {
                activatorPromoteState.setAcitvateType(type);
              }}
            />
          );
        case FUNCTION_ACTIVATE_TYPE.MEM_SQL_FUNCTION:
          return (
            <BaseCard
              key={FUNCTION_ACTIVATE_TYPE.MEM_SQL_FUNCTION}
              cardMedia={
                <SinglestoreIcon className="function-promote-editor__type-icon" />
              }
              cardName={type}
              cardContent="Deploy the function as a UDF (user-defined function) in Mem SQL"
              isActive={
                activatorPromoteState.activateType ===
                FUNCTION_ACTIVATE_TYPE.MEM_SQL_FUNCTION
              }
              onClick={() => {
                activatorPromoteState.setAcitvateType(type);
              }}
            />
          );
        case FUNCTION_ACTIVATE_TYPE.SERVICE_JAR:
          return (
            <BaseCard
              key={FUNCTION_ACTIVATE_TYPE.SERVICE_JAR}
              cardMedia={<div className="coming-soon-label">Coming Soon</div>}
              cardName={type}
              cardContent="Deploy the function in the definition of a Store persistence"
              disabled={true}
              isActive={
                activatorPromoteState.activateType ===
                FUNCTION_ACTIVATE_TYPE.SERVICE_JAR
              }
            />
          );
        case FUNCTION_ACTIVATE_TYPE.REFINER:
          return (
            <BaseCard
              key={FUNCTION_ACTIVATE_TYPE.REFINER}
              cardMedia={<div className="coming-soon-label">Coming Soon</div>}
              cardName={type}
              cardContent="Use the service in a refiner context"
              disabled={true}
              isActive={
                activatorPromoteState.activateType ===
                FUNCTION_ACTIVATE_TYPE.REFINER
              }
            />
          );
        case FUNCTION_ACTIVATE_TYPE.BIG_QUERY_NATIVE_APP:
          return (
            <BaseCard
              key={FUNCTION_ACTIVATE_TYPE.BIG_QUERY_NATIVE_APP}
              cardMedia={<div className="coming-soon-label">Coming Soon</div>}
              cardName={type}
              cardContent="Deploy the function as a UDTF(user-defined table function) in BigQuery"
              disabled={true}
              isActive={
                activatorPromoteState.activateType ===
                FUNCTION_ACTIVATE_TYPE.BIG_QUERY_NATIVE_APP
              }
            />
          );
        default:
          return <></>;
      }
    };

    return (
      <Dialog
        open={activatorPromoteState.isActivatingFunction}
        onClose={closeModal}
        classes={{ container: 'search-modal__container' }}
        PaperProps={{ classes: { root: 'search-modal__inner-container' } }}
      >
        <Modal
          darkMode={
            !applicationStore.layoutService.TEMPORARY__isLightColorThemeEnabled
          }
          className="function-promote-editor"
        >
          <ModalBody className="function-promote-editor__content">
            <div className="function-promote-editor__content__prompt">
              Select any one of the following activator types to continue
            </div>
            <div className="function-promote-editor__content__activator-types">
              {Object.values(FUNCTION_ACTIVATE_TYPE).map((type) =>
                renderFunctionPromoteTypes(type),
              )}
            </div>
            <div className="function-promote-editor__content__prompt">
              Target Path
            </div>
            <InputWithInlineValidation
              className="panel__content__form__section__input"
              spellCheck={false}
              onChange={onTargetPathChange}
              value={activatorPromoteState.activatorPath}
              error={elementAlreadyExistsMessage}
              showEditableIcon={true}
            />
          </ModalBody>
          <ModalFooter>
            <ModalFooterButton
              className="function-promote-editor__action-btn"
              onClick={closeModal}
              title="Close"
              type="secondary"
            >
              Cancel
            </ModalFooterButton>
            <ModalFooterButton
              className="function-promote-editor__action-btn function-promote-editor__action-btn--primitive"
              disabled={
                !activatorPromoteState.activateType ||
                !validateFunctionActivator(activatorPromoteState.activateType)
              }
              title={
                activatorPromoteState.activateType &&
                validateFunctionActivator(activatorPromoteState.activateType)
                  ? ''
                  : validationMessage
              }
              onClick={promoteFunction}
            >
              Activate
            </ModalFooterButton>
          </ModalFooter>
        </Modal>
      </Dialog>
    );
  },
);

const FunctionDefinitionEditor = observer(
  (props: {
    functionEditorState: FunctionEditorState;
    isReadOnly: boolean;
  }) => {
    const { functionEditorState, isReadOnly } = props;
    const editorStore = useEditorStore();
    const applicationStore = useApplicationStore();
    const lambdaEditorState = functionEditorState.functionDefinitionEditorState;
    const functionElement = functionEditorState.functionElement;
    const execResult = functionEditorState.executionResult;

    // Parameters
    const addParameter = (): void => {
      function_addParameter(
        functionElement,
        stub_RawVariableExpression(PrimitiveType.STRING),
      );
      updateFunctionName(editorStore, applicationStore, functionElement);
    };
    const deleteParameter =
      (val: RawVariableExpression): (() => void) =>
      (): void => {
        function_deleteParameter(functionElement, val);
        updateFunctionName(editorStore, applicationStore, functionElement);
      };
    const handleDropParameter = useCallback(
      (item: UMLEditorElementDropTarget): void => {
        if (!isReadOnly && item.data.packageableElement instanceof Type) {
          function_addParameter(
            functionElement,
            stub_RawVariableExpression(item.data.packageableElement),
          );
          updateFunctionName(editorStore, applicationStore, functionElement);
        }
      },
      [applicationStore, editorStore, functionElement, isReadOnly],
    );
    const [{ isParameterDragOver }, dropConnector] = useDrop<
      ElementDragSource,
      void,
      { isParameterDragOver: boolean }
    >(
      () => ({
        accept: [
          CORE_DND_TYPE.PROJECT_EXPLORER_CLASS,
          CORE_DND_TYPE.PROJECT_EXPLORER_ENUMERATION,
        ],
        drop: (item) => handleDropParameter(item),
        collect: (monitor) => ({
          isParameterDragOver: monitor.isOver({ shallow: true }),
        }),
      }),
      [handleDropParameter],
    );
    const ref = useRef<HTMLDivElement>(null);
    dropConnector(ref);

    const renderFuncResult = (): React.ReactNode => {
      if (execResult instanceof RawExecutionResult) {
        const val =
          execResult.value === null ? 'null' : execResult.value.toString();
        return (
          <CodeEditor
            language={CODE_EDITOR_LANGUAGE.TEXT}
            inputValue={val}
            isReadOnly={true}
          />
        );
      } else if (execResult instanceof TDSExecutionResult) {
        const colDefs = execResult.result.columns.map(
          (colName) =>
            ({
              minWidth: 50,
              sortable: true,
              resizable: true,
              field: colName,
              flex: 1,
              headerName: colName,
              ...getTDSColumnCustomizations(execResult, colName),
            }) as DataGridColumnDefinition,
        );
        return (
          <div
            data-testid={QUERY_BUILDER_TEST_ID.QUERY_BUILDER_RESULT_VALUES_TDS}
            className="query-builder__result__values__table"
          >
            <div
              className={clsx('query-builder__result__tds-grid', {
                'ag-theme-balham': true,
                'ag-theme-balham-dark': true,
              })}
            >
              <DataGrid
                rowData={getRowDataFromExecutionResult(execResult)}
                gridOptions={{
                  suppressScrollOnNewData: true,
                  getRowId: (data) => `${data.data.rowNumber}`,
                  rowSelection: {
                    mode: 'multiRow',
                    checkboxes: false,
                    headerCheckbox: false,
                  },
                }}
                // NOTE: when column definition changed, we need to force refresh the cell to make sure the cell renderer is updated
                // See https://stackoverflow.com/questions/56341073/how-to-refresh-an-ag-grid-when-a-change-occurs-inside-a-custom-cell-renderer-com
                onRowDataUpdated={(params) => {
                  params.api.refreshCells({ force: true });
                }}
                suppressFieldDotNotation={true}
                suppressContextMenu={false}
                columnDefs={colDefs}
              />
            </div>
          </div>
        );
      } else if (execResult !== undefined) {
        const json =
          returnUndefOnError(() =>
            JSON.stringify(
              extractExecutionResultValues(execResult),
              null,
              DEFAULT_TAB_SIZE,
            ),
          ) ?? JSON.stringify(execResult);
        return (
          <CodeEditor
            language={CODE_EDITOR_LANGUAGE.JSON}
            inputValue={json}
            isReadOnly={true}
          />
        );
      }
      return <BlankPanelContent>Function Did Not Run</BlankPanelContent>;
    };
    return (
      <>
        <PanelLoadingIndicator
          isLoading={
            functionEditorState.isGeneratingPlan ||
            functionEditorState.isRunningFunc
          }
        />
        <div className="function-editor__definition">
          <div className="function-editor__definition__item function-editor__definition__item-params">
            <div className="function-editor__definition__item__header">
              <div className="function-editor__definition__item__header__title">
                PARAMETERS
              </div>
              <button
                className="function-editor__definition__item__header__add-btn btn--dark"
                disabled={isReadOnly}
                onClick={addParameter}
                tabIndex={-1}
                title="Add Parameter"
              >
                <PlusIcon />
              </button>
            </div>
            <DragPreviewLayer
              labelGetter={(item: FunctionParameterDragSource): string =>
                item.parameter.name === '' ? '(unknown)' : item.parameter.name
              }
              types={[FUNCTION_PARAMETER_DND_TYPE]}
            />
            <div
              ref={ref}
              className={clsx('function-editor__definition__item__content', {
                'panel__content__lists--dnd-over':
                  isParameterDragOver && !isReadOnly,
              })}
            >
              {functionElement.parameters.map((param) => (
                <ParameterBasicEditor
                  key={param._UUID}
                  parameter={param}
                  _func={functionElement}
                  deleteParameter={deleteParameter(param)}
                  isReadOnly={isReadOnly}
                />
              ))}
              {functionElement.parameters.length === 0 && (
                <div className="function-editor__definition__item__content--empty">
                  No parameters
                </div>
              )}
            </div>
          </div>
          <div className="function-editor__definition__item function-editor__definition__item-lambda">
            <div className="function-editor__definition__item__header">
              <div className="function-editor__definition__item__header-wrapper">
                <div className="function-editor__definition__item__header__title">
                  LAMBDA
                </div>
                <div className="function-editor__definition__typeAhead">
                  <div className="function-editor__definition__typeAhead__label">
                    (BETA) TypeAhead
                    <DocumentationLink
                      title="Enable TypeAhead for when typing your function. Caution when using against bigger projects as requires compilation to work"
                      documentationKey={
                        LEGEND_STUDIO_DOCUMENTATION_KEY.QUESTION_HOW_TO_ENABLE_TYPEAHEAD
                      }
                    />
                  </div>
                  <button
                    className={clsx(
                      'function-editor__definition__typeAhead__toggler__btn',
                      {
                        'function-editor__definition__typeAhead__toggler__btn--toggled':
                          lambdaEditorState.typeAheadEnabled,
                      },
                    )}
                    onClick={() =>
                      lambdaEditorState.setTypeAhead(
                        !lambdaEditorState.typeAheadEnabled,
                      )
                    }
                    tabIndex={-1}
                  >
                    {lambdaEditorState.typeAheadEnabled ? (
                      <CheckSquareIcon />
                    ) : (
                      <SquareIcon />
                    )}
                  </button>
                </div>
              </div>
              <div>
                <ReturnTypeEditor
                  functionElement={functionElement}
                  isReadOnly={isReadOnly}
                />
              </div>
            </div>
            <div
              className={clsx('function-editor__definition__item__content', {
                backdrop__element: Boolean(
                  functionEditorState.functionDefinitionEditorState.parserError,
                ),
              })}
            >
              <LambdaEditor
                className={clsx(
                  'function-editor__definition__lambda-editor lambda-editor--dark',
                  {
                    'function-editor__definition__lambda-editor-error': Boolean(
                      lambdaEditorState.parserError ??
                        lambdaEditorState.compilationError,
                    ),
                  },
                )}
                disabled={
                  lambdaEditorState.isConvertingFunctionBodyToString ||
                  isReadOnly
                }
                lambdaEditorState={lambdaEditorState}
                forceBackdrop={false}
                autoFocus={true}
              />
            </div>
          </div>
          <div className="function-editor__definition__item function-editor__definition__item-result function-editor__definition__result">
            <div className="function-editor__definition__item__header">
              <div className="function-editor__definition__item__header__title">
                RESULT
                <PanelGroupItemExperimentalBadge />
              </div>
            </div>
            <div className="function-editor__definition__item__content">
              <div className="function-editor__definition__result-viewer">
                {renderFuncResult()}
              </div>
            </div>
          </div>
        </div>
      </>
    );
  },
);

export const FunctionEditor = observer(() => {
  const editorStore = useEditorStore();
  const applicationStore = useApplicationStore();
  const functionEditorState =
    editorStore.tabManagerState.getCurrentEditorState(FunctionEditorState);
  const isReadOnly = functionEditorState.isReadOnly;
  const functionElement = functionEditorState.functionElement;
  const selectedTab = functionEditorState.selectedTab;
  let addButtonTitle = '';
  switch (selectedTab) {
    case FUNCTION_EDITOR_TAB.TAGGED_VALUES:
      addButtonTitle = 'Add stereotype';
      break;
    case FUNCTION_EDITOR_TAB.STEREOTYPES:
      addButtonTitle = 'Add tagged value';
      break;
    default:
      break;
  }
  // Tagged Values
  const add = (): void => {
    if (!isReadOnly) {
      if (selectedTab === FUNCTION_EDITOR_TAB.TAGGED_VALUES) {
        annotatedElement_addTaggedValue(
          functionElement,
          stub_TaggedValue(stub_Tag(stub_Profile())),
        );
      } else if (selectedTab === FUNCTION_EDITOR_TAB.STEREOTYPES) {
        annotatedElement_addStereotype(
          functionElement,
          StereotypeExplicitReference.create(stub_Stereotype(stub_Profile())),
        );
      }
    }
  };
  const handleDropTaggedValue = useCallback(
    (item: UMLEditorElementDropTarget): void => {
      if (!isReadOnly && item.data.packageableElement instanceof Profile) {
        annotatedElement_addTaggedValue(
          functionElement,
          stub_TaggedValue(stub_Tag(item.data.packageableElement)),
        );
      }
    },
    [functionElement, isReadOnly],
  );
  const [{ isTaggedValueDragOver }, taggedValueDropConnector] = useDrop<
    ElementDragSource,
    void,
    { isTaggedValueDragOver: boolean }
  >(
    () => ({
      accept: [CORE_DND_TYPE.PROJECT_EXPLORER_PROFILE],
      drop: (item) => handleDropTaggedValue(item),
      collect: (monitor) => ({
        isTaggedValueDragOver: monitor.isOver({ shallow: true }),
      }),
    }),
    [handleDropTaggedValue],
  );
  const taggedValueRef = useRef<HTMLDivElement>(null);
  taggedValueDropConnector(taggedValueRef);

  // Stereotype
  const handleDropStereotype = useCallback(
    (item: UMLEditorElementDropTarget): void => {
      if (!isReadOnly && item.data.packageableElement instanceof Profile) {
        annotatedElement_addStereotype(
          functionElement,
          StereotypeExplicitReference.create(
            stub_Stereotype(item.data.packageableElement),
          ),
        );
      }
    },
    [functionElement, isReadOnly],
  );
  const [{ isStereotypeDragOver }, stereotypeDropConnector] = useDrop<
    ElementDragSource,
    void,
    { isStereotypeDragOver: boolean }
  >(
    () => ({
      accept: [CORE_DND_TYPE.PROJECT_EXPLORER_PROFILE],
      drop: (item) => handleDropStereotype(item),
      collect: (monitor) => ({
        isStereotypeDragOver: monitor.isOver({ shallow: true }),
      }),
    }),
    [handleDropStereotype],
  );
  const stereotypeRef = useRef<HTMLDivElement>(null);
  stereotypeDropConnector(stereotypeRef);

  const _deleteStereotype =
    (val: StereotypeReference): (() => void) =>
    (): void =>
      annotatedElement_deleteStereotype(functionElement, val);
  const _deleteTaggedValue =
    (val: TaggedValue): (() => void) =>
    (): void =>
      annotatedElement_deleteTaggedValue(functionElement, val);
  const changeTab =
    (tab: FUNCTION_EDITOR_TAB): (() => void) =>
    (): void =>
      functionEditorState.setSelectedTab(tab);

  const runFunc = applicationStore.guardUnhandledError(() =>
    flowResult(functionEditorState.handleRunFunc()),
  );

  const executionIsRunning =
    functionEditorState.isRunningFunc || functionEditorState.isGeneratingPlan;

  const cancelQuery = applicationStore.guardUnhandledError(() =>
    flowResult(functionEditorState.cancelFuncRun()),
  );

  const generatePlan = applicationStore.guardUnhandledError(() =>
    flowResult(functionEditorState.generatePlan(false)),
  );

  const generateLineage = applicationStore.guardUnhandledError(() =>
    flowResult(functionEditorState.generateLineage()),
  );

  const debugPlanGeneration = applicationStore.guardUnhandledError(() =>
    flowResult(functionEditorState.generatePlan(true)),
  );
  const embeddedQueryBuilderState = editorStore.embeddedQueryBuilderState;
  useEffect(() => {
    flowResult(
      functionEditorState.functionDefinitionEditorState.convertLambdaObjectToGrammarString(
        {
          pretty: true,
          firstLoad: true,
        },
      ),
    ).catch(applicationStore.alertUnhandledError);
  }, [applicationStore, functionEditorState]);

  useApplicationNavigationContext(
    LEGEND_STUDIO_APPLICATION_NAVIGATION_CONTEXT_KEY.FUNCTION_EDITOR,
  );

  const editWithQueryBuilder = (): (() => void) =>
    applicationStore.guardUnhandledError(async () => {
      try {
        const functionQueryBuilderState = new FunctionQueryBuilderState(
          embeddedQueryBuilderState.editorStore.applicationStore,
          embeddedQueryBuilderState.editorStore.graphManagerState,
          QueryBuilderAdvancedWorkflowState.INSTANCE,
          functionEditorState.functionElement,
          editorStore.applicationStore.config.options.queryBuilderConfig,
        );
        functionQueryBuilderState.initializeWithQuery(
          new RawLambda(
            functionEditorState.functionElement.parameters.map((_param) =>
              functionEditorState.editorStore.graphManagerState.graphManager.serializeRawValueSpecification(
                _param,
              ),
            ),
            functionEditorState.functionElement.expressionSequence,
          ),
        );
        assertTrue(
          Boolean(
            functionQueryBuilderState.isQuerySupported &&
              functionQueryBuilderState.executionContextState.mapping &&
              functionQueryBuilderState.executionContextState.runtimeValue,
          ),
          `Only functions returning TDS/graph fetch using the from() function can be edited via query builder`,
        );
        await flowResult(
          embeddedQueryBuilderState.setEmbeddedQueryBuilderConfiguration({
            setupQueryBuilderState: async (): Promise<QueryBuilderState> =>
              functionQueryBuilderState,
            actionConfigs: [
              {
                key: 'save-query-btn',
                renderer: (
                  queryBuilderState: QueryBuilderState,
                ): React.ReactNode => {
                  const save = applicationStore.guardUnhandledError(
                    async () => {
                      try {
                        const rawLambda = queryBuilderState.buildQuery();
                        await flowResult(
                          functionEditorState.updateFunctionWithQuery(
                            rawLambda,
                          ),
                        );
                        applicationStore.notificationService.notifySuccess(
                          `Function query is updated`,
                        );
                        embeddedQueryBuilderState.setEmbeddedQueryBuilderConfiguration(
                          undefined,
                        );
                      } catch (error) {
                        assertErrorThrown(error);
                        applicationStore.notificationService.notifyError(
                          `Can't save query: ${error.message}`,
                        );
                      }
                    },
                  );
                  return (
                    <button
                      className="query-builder__dialog__header__custom-action"
                      tabIndex={-1}
                      disabled={isReadOnly}
                      onClick={save}
                    >
                      Save Query
                    </button>
                  );
                },
              },
            ],
          }),
        );
      } catch (error) {
        assertErrorThrown(error);
        applicationStore.notificationService.notifyError(
          `Unable to edit via query builder: ${error.message}`,
        );
      }
    });

  const openFunctionCubeViewer =
    editorStore.applicationStore.guardUnhandledError(async () => {
      await functionEditorState.handleOpeningDataCube(
        functionEditorState.element,
        editorStore,
      );
    });

  const visitActivator = (activator: FunctionActivator): void =>
    functionEditorState.editorStore.graphEditorMode.openElement(activator);

  const openFunctionActivateModal = (): void => {
    functionEditorState.activatorPromoteState.showFunctionActivateModal();
  };
  return (
    <div
      data-testid={LEGEND_STUDIO_TEST_ID.FUNCTION_EDITOR}
      className="function-editor uml-editor uml-editor--dark"
    >
      <Panel>
        <div className="panel__header">
          <div className="panel__header__title">
            {isReadOnly && (
              <div className="uml-element-editor__header__lock">
                <LockIcon />
              </div>
            )}
            <div className="panel__header__title__label">function</div>
            <div className="panel__header__title__content">
              {functionElement.functionName}
            </div>
          </div>
        </div>
        <div className="panel__header function-editor__tabs__header">
          <div className="function-editor__tabs">
            {Object.values(FUNCTION_EDITOR_TAB).map((tab) => (
              <div
                key={tab}
                onClick={changeTab(tab)}
                className={clsx('function-editor__tab', {
                  'function-editor__tab--active': tab === selectedTab,
                })}
              >
                {prettyCONSTName(tab)}
                {tab === FUNCTION_EDITOR_TAB.TEST_SUITES && (
                  <DocumentationLink
                    documentationKey={
                      LEGEND_STUDIO_DOCUMENTATION_KEY.QUESTION_HOW_TO_WRITE_A_FUNCTION_TEST
                    }
                  />
                )}
              </div>
            ))}
          </div>
          <div className="panel__header__actions">
            {selectedTab === FUNCTION_EDITOR_TAB.DEFINITION && (
              <>
                <div className="btn__dropdown-combo btn__dropdown-combo--primary">
                  <button
                    className="btn__dropdown-combo__label"
                    onClick={editWithQueryBuilder()}
                    title="Edit Query"
                    tabIndex={-1}
                  >
                    <PencilIcon className="btn__dropdown-combo__label__icon" />
                    <div className="btn__dropdown-combo__label__title">
                      Edit
                    </div>
                  </button>
                </div>
                <div className="btn__dropdown-combo btn__dropdown-combo--primary">
                  {functionEditorState.isRunningFunc ? (
                    <button
                      className="btn__dropdown-combo__canceler"
                      onClick={cancelQuery}
                      tabIndex={-1}
                    >
                      <div className="btn--dark btn--caution btn__dropdown-combo__canceler__label">
                        <PauseCircleIcon className="btn__dropdown-combo__canceler__label__icon" />
                        <div className="btn__dropdown-combo__canceler__label__title">
                          Stop
                        </div>
                      </div>
                    </button>
                  ) : (
                    <>
                      <button
                        className="btn__dropdown-combo__label"
                        onClick={runFunc}
                        title="Run Function"
                        disabled={executionIsRunning}
                        tabIndex={-1}
                      >
                        <PlayIcon className="btn__dropdown-combo__label__icon" />
                        <div className="btn__dropdown-combo__label__title">
                          Run
                        </div>
                      </button>
                      <ControlledDropdownMenu
                        className="btn__dropdown-combo__dropdown-btn"
                        disabled={executionIsRunning}
                        content={
                          <MenuContent>
                            <MenuContentItem
                              className="btn__dropdown-combo__option"
                              onClick={generatePlan}
                            >
                              Generate Plan
                            </MenuContentItem>
                            <MenuContentItem
                              className="btn__dropdown-combo__option"
                              onClick={debugPlanGeneration}
                            >
                              Debug
                            </MenuContentItem>
                            <MenuContentItem
                              className="btn__dropdown-combo__option"
                              onClick={generateLineage}
                            >
                              View Lineage
                            </MenuContentItem>
                          </MenuContent>
                        }
                        menuProps={{
                          anchorOrigin: {
                            vertical: 'bottom',
                            horizontal: 'right',
                          },
                          transformOrigin: {
                            vertical: 'top',
                            horizontal: 'right',
                          },
                        }}
                      >
                        <CaretDownIcon />
                      </ControlledDropdownMenu>
                    </>
                  )}
                </div>
                <div className="btn__dropdown-combo btn__dropdown-combo--primary">
                  <button
                    className="btn__dropdown-combo__label"
                    onClick={openFunctionCubeViewer}
                    title="Data Cube (BETA)"
                    tabIndex={-1}
                  >
                    <div className="btn__dropdown-combo__label__title">
                      Data Cube
                    </div>
                  </button>
                </div>
                <div className="btn__dropdown-combo btn__dropdown-combo--primary">
                  <button
                    className="btn__dropdown-combo__label"
                    onClick={openFunctionActivateModal}
                    title="Activate function"
                    tabIndex={-1}
                  >
                    <RocketIcon className="btn__dropdown-combo__label__icon" />
                    <div className="btn__dropdown-combo__label__title">
                      Activate
                    </div>
                  </button>
                </div>
              </>
            )}
            <button
              className="panel__header__action"
              disabled={
                isReadOnly ||
                selectedTab === FUNCTION_EDITOR_TAB.DEFINITION ||
                selectedTab === FUNCTION_EDITOR_TAB.LAMBDAS
              }
              onClick={add}
              tabIndex={-1}
              title={addButtonTitle}
            >
              <PlusIcon />
            </button>
          </div>
        </div>
        <PanelContent>
          {selectedTab === FUNCTION_EDITOR_TAB.DEFINITION && (
            <FunctionDefinitionEditor
              functionEditorState={functionEditorState}
              isReadOnly={isReadOnly}
            />
          )}
          {selectedTab === FUNCTION_EDITOR_TAB.TAGGED_VALUES && (
            <div
              ref={taggedValueRef}
              className={clsx('panel__content__lists', {
                'panel__content__lists--dnd-over':
                  isTaggedValueDragOver && !isReadOnly,
              })}
            >
              <TaggedValueDragPreviewLayer />
              {functionElement.taggedValues.map((taggedValue) => (
                <TaggedValueEditor
                  annotatedElement={functionElement}
                  key={taggedValue._UUID}
                  taggedValue={taggedValue}
                  deleteValue={_deleteTaggedValue(taggedValue)}
                  isReadOnly={isReadOnly}
                  darkTheme={true}
                />
              ))}
            </div>
          )}
          {selectedTab === FUNCTION_EDITOR_TAB.STEREOTYPES && (
            <div
              ref={stereotypeRef}
              className={clsx('panel__content__lists', {
                'panel__content__lists--dnd-over':
                  isStereotypeDragOver && !isReadOnly,
              })}
            >
              <StereotypeDragPreviewLayer />
              {functionElement.stereotypes.map((stereotype) => (
                <StereotypeSelector
                  key={stereotype.value._UUID}
                  annotatedElement={functionElement}
                  stereotype={stereotype}
                  deleteStereotype={_deleteStereotype(stereotype)}
                  isReadOnly={isReadOnly}
                  darkTheme={true}
                />
              ))}
            </div>
          )}
          {selectedTab === FUNCTION_EDITOR_TAB.TEST_SUITES && (
            <FunctionTestableEditor
              functionTestableState={
                functionEditorState.functionTestableEditorState
              }
            />
          )}
          {selectedTab === FUNCTION_EDITOR_TAB.LAMBDAS && (
            <div>
              <div className="hosted-service-function-activator-editor__configuration__items">
                {functionEditorState.activators.map((activator) => (
                  <div
                    key={activator.name}
                    className="hosted-service-function-activator-editor__configuration__item"
                  >
                    <div className="btn--sm btn--icon--dark hosted-service-function-activator-editor__configuration__item__label">
                      {getElementIcon(activator, editorStore)}
                    </div>
                    <input
                      className="panel__content__form__section__input"
                      spellCheck={false}
                      disabled={true}
                      value={activator.path}
                    />
                    <button
                      className="btn--dark btn--sm hosted-service-function-activator-editor__configuration__item__btn"
                      onClick={() => visitActivator(activator)}
                      tabIndex={-1}
                      title="See Lambda"
                    >
                      <LongArrowRightIcon />
                    </button>
                  </div>
                ))}
              </div>
            </div>
          )}
          <ExecutionPlanViewer
            executionPlanState={functionEditorState.executionPlanState}
          />
          <LineageViewer lineageState={functionEditorState.lineageState} />
          {functionEditorState.parametersState.parameterValuesEditorState
            .showModal && (
            <LambdaParameterValuesEditor
              graph={functionEditorState.editorStore.graphManagerState.graph}
              observerContext={
                functionEditorState.editorStore.changeDetectionState
                  .observerContext
              }
              lambdaParametersState={functionEditorState.parametersState}
            />
          )}
        </PanelContent>
        {functionEditorState.activatorPromoteState.isActivatingFunction && (
          <FunctionPromoteEditor
            functionElement={functionElement}
            activatorPromoteState={functionEditorState.activatorPromoteState}
          />
        )}
      </Panel>
    </div>
  );
});