52 lines
1.5 KiB
JavaScript
52 lines
1.5 KiB
JavaScript
import {createSelector} from "reselect";
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function calculateSpocs(component, spocs) {
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let spocIndex = 0;
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return component.spocs.positions.map(position => {
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const rickRoll = Math.random();
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if (spocs.data.spocs[spocIndex] && rickRoll <= component.spocs.probability) {
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return {
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...position,
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result: spocs.data.spocs[spocIndex++],
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};
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}
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return position;
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});
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}
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export const selectLayoutRender = createSelector(
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// Selects layout, feeds, spocs so that we only recompute if
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// any of these values change.
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[
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state => state.DiscoveryStream.layout,
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state => state.DiscoveryStream.feeds,
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state => state.DiscoveryStream.spocs,
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],
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// Adds data to each component from feeds. This function only re-runs if one of the inputs change.
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// TODO: calculate spocs
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function layoutRender(layout, feeds, spocs) {
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return layout.map(row => ({
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...row,
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// Loops through all the components and adds a .data property
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// containing data from feeds
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components: row.components.map(component => {
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if (!component.feed || !feeds[component.feed.url]) {
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return component;
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}
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// Calculate if we should display a spoc or not.
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if (component.spocs && spocs.data.spocs && spocs.data.spocs.length) {
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component.spocs = {
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...component.spocs,
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positions: calculateSpocs(component, spocs),
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};
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}
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return {...component, data: feeds[component.feed.url].data};
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}),
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}));
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}
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);
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