redbadger/pride-london-app

// @flow
import { connect } from "react-redux";
import type { Connector } from "react-redux";
import { createSelector } from "reselect";
import type { NavigationScreenProp, NavigationState } from "react-navigation";
import type { State } from "../../reducers";
import type { Event } from "../../data/event";
import type { HeaderBanner } from "../../data/header-banner";
import type { ImageDetails } from "../../data/image";
import { getImageDetails } from "../../data/image";
import strings from "../../constants/strings";
import { selectData, getFeaturedEventsResolvedEvents } from "../../selectors";
import { selectLoading } from "../../selectors/data";
import { selectHeaderBanners } from "../../selectors/header-banner";
import Component from "./component";
import withIsFocused from "../../components/WithIsFocused";

type OwnProps = {
  navigation: NavigationScreenProp<NavigationState>,
  isFocused: boolean
};

type StateProps = {
  navigation: NavigationScreenProp<NavigationState>,
  headerBanners: HeaderBanner[],
  featuredEventsTitle: string,
  featuredEvents: Event[],
  loading: boolean,
  getImageDetails: string => ?ImageDetails
};

type Props = StateProps;

const getDataLoading = createSelector([selectData], selectLoading);

let cache: StateProps;

// Note we must add a return type here for react-redux connect to work
// with flow correctly. If not provided is silently fails if types do
// not line up. See https://github.com/facebook/flow/issues/5343
const mapStateToProps = (
  state: State,
  { navigation, isFocused }: OwnProps
): StateProps => {
  if (!cache || isFocused) {
    cache = {
      navigation,
      headerBanners: selectHeaderBanners(state),
      featuredEventsTitle: strings.featuredEventsTitle,
      featuredEvents: getFeaturedEventsResolvedEvents(
        state,
        strings.featuredEventsTitle
      ),
      loading: getDataLoading(state),
      getImageDetails: getImageDetails(state.data.images)
    };
  }
  return cache;
};

const mapDispatchToProps = {};

const connector: Connector<OwnProps, Props> = connect(
  mapStateToProps,
  mapDispatchToProps
);

export const Container = connector(Component);

export default withIsFocused(Container);