aretherecookies-mobile/js/enhancers/foodItemEnhancers.js

// @flow
import withProps from 'recompose/withProps';
import compose from 'recompose/compose';
import mapPropsStream from 'recompose/mapPropsStream';
import FoodItems$ from '../streams/FoodItemsStream';
import typeof FoodItemRecord from '../records/FoodItemRecord';
import { Map, Set } from 'immutable';
import { pipe, path, toLower, equals } from 'ramda';

type FindPredicate<A> = (left: A) => (right: A) => Boolean;

const getName: (f: FoodItemRecord) => String = pipe(
	path(['name']),
	toLower
);

const matchesName: FindPredicate<FoodItemRecord> = left => right => {
	return equals(getName(left), getName(right));
};

const addIfNotExisting = (predicate: FindPredicate<FoodItemRecord>) => (
	set: Set<FoodItemRecord>,
	item: FoodItemRecord
) => {
	return !set.find(predicate(item)) ? set.add(item) : set;
};

const intoSet = reducer => items => {
	return items ? items.reduce(reducer, new Set()) : new Set();
};

export const withFoodItems = mapPropsStream(props$ =>
	props$.combineLatest(FoodItems$, (props, foodItems) => {
		return {
			...props,
			foodItemsMap: foodItems && foodItems,
		};
	})
);

export const withFoodItemsAsSeq = mapPropsStream(props$ =>
	props$.combineLatest(FoodItems$, (props, foodItems) => {
		return {
			...props,
			foodItemsSeq: foodItems && foodItems.valueSeq(),
		};
	})
);

export const withFoodItemIdFromRoute = withProps((props: { match: { params: { id: string } } }) => {
	const id: string = path(['match', 'params', 'id'], props) || '';
	return { foodItemId: id };
});

export const withFoodItem = compose(
	withFoodItems,
	withFoodItemIdFromRoute,
	withProps((props: { foodItemsMap: ?Map<number, FoodItemRecord>, foodItemId: number }) => {
		const { foodItemsMap, foodItemId } = props;
		return { foodItem: foodItemsMap && foodItemsMap.get(foodItemId) };
	})
);

export const withFoodItemPlaceId = withProps((props: { foodItem: FoodItemRecord }) => {
	const { foodItem } = props;
	return {
		placeId: foodItem && foodItem.placeId,
	};
});

export const withFoodItemsGroupedByPlace = compose(
	withFoodItems,
	withProps((props: { foodItemsMap: ?Map<number, FoodItemRecord> }) => {
		if (!props.foodItemsMap) {
			return {};
		}
		return {
			foodItemsByPlace: props.foodItemsMap.groupBy(foodItem => foodItem.placeId),
		};
	})
);

export const withUniqueFoodItems = compose(
	withFoodItemsAsSeq,
	withProps(({ foodItemsSeq }) => {
		return {
			foodItemsSeq: intoSet(addIfNotExisting(matchesName))(foodItemsSeq),
		};
	})
);