PromucFlow_constructor/app/client/src/selectors/appViewSelectors.tsx

import { createSelector } from "reselect";
import { AppState, DataTree } from "../reducers";
import { AppViewReduxState } from "../reducers/uiReducers/appViewReducer";
import { PageListReduxState } from "reducers/entityReducers/pageListReducer";
import { getDataTree } from "./entitiesSelector";
import createCachedSelector from "re-reselect";
import CanvasWidgetsNormalizer from "normalizers/CanvasWidgetsNormalizer";
import { getValidatedDynamicProps } from "./editorSelectors";
import { CanvasWidgetsReduxState } from "../reducers/entityReducers/canvasWidgetsReducer";

const getAppViewState = (state: AppState) => state.ui.appView;
const getPageListState = (state: AppState): PageListReduxState =>
  state.entities.pageList;
export const getCurrentPageId = (state: AppState) =>
  state.ui.appView.currentPageId;

// For the viewer, this does not need to be wrapped in createCachedSelector, as it will not change in subsequent renders.
// export const getCurrentPageLayoutDSL = createSelector(
//   getAppViewState,
//   getDataTree,
//   (view: AppViewReduxState, dataTree: DataTree) =>
//     injectDataTreeIntoDsl(dataTree, view.dsl),
// );

export const getPageList = createSelector(
  getPageListState,
  (pageList: PageListReduxState) =>
    pageList.pages.length > 0 ? pageList.pages : undefined,
);

export const getIsFetchingPage = createSelector(
  getAppViewState,
  (view: AppViewReduxState) => view.isFetchingPage,
);

export const getCurrentDSLPageId = createSelector(
  getAppViewState,
  (view: AppViewReduxState) => view.currentPageId,
);

export const getPageWidgetId = createSelector(
  getAppViewState,
  (view: AppViewReduxState) => view.pageWidgetId,
);
export const getCurrentPageLayoutDSL = createCachedSelector(
  getPageWidgetId,
  getDataTree,
  getValidatedDynamicProps,
  (
    pageWidgetId: string,
    entities: DataTree,
    validatedDynamicWidgets: CanvasWidgetsReduxState,
  ) => {
    return CanvasWidgetsNormalizer.denormalize(pageWidgetId, {
      ...entities,
      canvasWidgets: validatedDynamicWidgets,
    });
  },
)((pageWidgetId, entities) => entities || 0);