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export const selectLayoutRender = (state, prefs, rickRollCache) => {
const {layout, feeds, spocs} = state;
let spocIndex = 0;
let bufferRollCache = [];
// Records the chosen and unchosen spocs by the probability selection.
let chosenSpocs = new Set();
let unchosenSpocs = new Set();
function rollForSpocs(data, spocsConfig) {
const recommendations = [...data.recommendations];
for (let position of spocsConfig.positions) {
const spoc = spocs.data.spocs[spocIndex];
if (!spoc) {
break;
}
// Cache random number for a position
let rickRoll;
if (!rickRollCache.length) {
rickRoll = Math.random();
bufferRollCache.push(rickRoll);
} else {
rickRoll = rickRollCache.shift();
bufferRollCache.push(rickRoll);
}
if (rickRoll <= spocsConfig.probability) {
spocIndex++;
recommendations.splice(position.index, 0, spoc);
chosenSpocs.add(spoc);
} else {
unchosenSpocs.add(spoc);
}
}
return {
...data,
recommendations,
};
}
const positions = {};
const DS_COMPONENTS = ["Message", "SectionTitle", "Navigation",
"CardGrid", "Hero", "HorizontalRule", "List"];
const filterArray = [];
if (!prefs["feeds.topsites"]) {
filterArray.push("TopSites");
}
if (!prefs["feeds.section.topstories"]) {
filterArray.push(...DS_COMPONENTS);
}
const placeholderComponent = component => {
const data = {
recommendations: [],
};
let items = 0;
if (component.properties && component.properties.items) {
items = component.properties.items;
}
for (let i = 0; i < items; i++) {
data.recommendations.push({"placeholder": true});
}
return {...component, data};
};
const handleComponent = component => {
positions[component.type] = positions[component.type] || 0;
const feed = feeds.data[component.feed.url];
let data = {
recommendations: [],
};
if (feed && feed.data) {
data = {
...feed.data,
recommendations: [...feed.data.recommendations],
};
}
if (component && component.properties && component.properties.offset) {
data = {
...data,
recommendations: data.recommendations.slice(component.properties.offset),
};
}
// Do we ever expect to possibly have a spoc.
if (data && component.spocs && component.spocs.positions && component.spocs.positions.length) {
// We expect a spoc, spocs are loaded, and the server returned spocs.
if (spocs.loaded && spocs.data.spocs && spocs.data.spocs.length) {
data = rollForSpocs(data, component.spocs);
}
}
let items = 0;
if (component.properties && component.properties.items) {
items = Math.min(component.properties.items, data.recommendations.length);
}
// loop through a component items
// Store the items position sequentially for multiple components of the same type.
// Example: A second card grid starts pos offset from the last card grid.
for (let i = 0; i < items; i++) {
data.recommendations[i] = {
...data.recommendations[i],
pos: positions[component.type]++,
};
}
return {...component, data};
};
const renderLayout = () => {
const renderedLayoutArray = [];
for (const row of layout.filter(r => r.components.filter(c => !filterArray.includes(c.type)).length)) {
let components = [];
renderedLayoutArray.push({
...row,
components,
});
for (const component of row.components.filter(c => !filterArray.includes(c.type))) {
if (component.feed) {
const spocsConfig = component.spocs;
// Are we still waiting on a feed/spocs, render what we have,
// add a placeholder for this component, and bail out early.
if (!feeds.data[component.feed.url] ||
(spocsConfig && spocsConfig.positions && spocsConfig.positions.length && !spocs.loaded)) {
components.push(placeholderComponent(component));
return renderedLayoutArray;
}
components.push(handleComponent(component));
} else {
components.push(component);
}
}
}
return renderedLayoutArray;
};
const layoutRender = renderLayout(layout);
// If empty, fill rickRollCache with random probability values from bufferRollCache
if (!rickRollCache.length) {
rickRollCache.push(...bufferRollCache);
}
// Generate the payload for the SPOCS Fill ping. Note that a SPOC could be rejected
// by the `probability_selection` first, then gets chosen for the next position. For
// all other SPOCS that never went through the probabilistic selection, its reason will
// be "out_of_position".
let spocsFill = [];
if (spocs.loaded && feeds.loaded && spocs.data.spocs) {
const chosenSpocsFill = [...chosenSpocs]
.map(spoc => ({id: spoc.id, reason: "n/a", displayed: 1, full_recalc: 0}));
const unchosenSpocsFill = [...unchosenSpocs]
.filter(spoc => !chosenSpocs.has(spoc))
.map(spoc => ({id: spoc.id, reason: "probability_selection", displayed: 0, full_recalc: 0}));
const outOfPositionSpocsFill = spocs.data.spocs.slice(spocIndex)
.filter(spoc => !unchosenSpocs.has(spoc))
.map(spoc => ({id: spoc.id, reason: "out_of_position", displayed: 0, full_recalc: 0}));
spocsFill = [
...chosenSpocsFill,
...unchosenSpocsFill,
...outOfPositionSpocsFill,
];
}
return {spocsFill, layoutRender};
};
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