import React from 'react';
import { View, FlatList } from 'react-native';
import { type SetSeq } from 'immutable';
import ProductRecord from '../records/ProductRecord';
import { compose, pure } from 'recompose';
import { pipe } from 'ramda';
import { withFilter } from '../enhancers/filterEnhancers';
import { compareQuantity } from '../helpers/QuantityHelpers';

const sortByDistance = (productsSeq: SetSeq<ProductRecord>): SetSeq<ProductRecord> => {
	return productsSeq.sort((left, right) => left.distance - right.distance);
};

const sortByLastUpdated = (productsSeq: SetSeq<ProductRecord>): SetSeq<ProductRecord> => {
	return productsSeq.sort((left, right) => right.lastupdated - left.lastupdated);
};

const sortByQuantity = (productsSeq: SetSeq<ProductRecord>): SetSeq<ProductRecord> => {
	return productsSeq.sort((left, right) => {
		const quantityCompare = compareQuantity(left.quantity, right.quantity);
		return quantityCompare === 0 ? left.distance - right.distance : quantityCompare;
	});
};

const getSortBy = filter => {
	switch (filter.orderby) {
		case 'quantity':
			return sortByQuantity;
		case 'lastupdated':
			return sortByLastUpdated;
		default:
			return sortByDistance;
	}
};

const intoArray = (productsSeq: SetSeq<ProductRecord>): Array<ProductRecord> =>
	productsSeq ? productsSeq.toArray() : [];

const ProductList = props => {
	const { filter, productsSeq, children } = props;

	if (!productsSeq) {
		return null;
	}

	const items = pipe(
		getSortBy(filter),
		intoArray
	)(productsSeq);

	return (
		<View style={{ flexShrink: 2 }}>
			<FlatList
				data={items}
				renderItem={({ item }) => children(item)}
				keyExtractor={item => item.id}
			/>
		</View>
	);
};

export default compose(
	pure,
	withFilter
)(ProductList);