25 lines
986 B
TypeScript
25 lines
986 B
TypeScript
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/**
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* The days the analytics chart shows: the last `count` calendar days up to
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* `today`, each one present, with 0 for a day nobody visited.
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*
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* The chart used to take the last 14 *recorded* days, so a quiet week simply
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* vanished and "Last 14 Days" could span a month (QA A-16).
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*
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* Keys are UTC dates (`YYYY-MM-DD`), the way /api/analytics/track writes them,
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* so `today` is read in UTC too — a local date would be a day off either side
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* of midnight.
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*/
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export function lastDays(
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days: Record<string, { pageviews?: number } | undefined>,
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count: number,
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today: Date,
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): Array<{ date: string; pageviews: number }> {
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const end = Date.UTC(today.getUTCFullYear(), today.getUTCMonth(), today.getUTCDate());
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const out: Array<{ date: string; pageviews: number }> = [];
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for (let i = count - 1; i >= 0; i--) {
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const date = new Date(end - i * 86_400_000).toISOString().slice(0, 10);
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out.push({ date, pageviews: days[date]?.pageviews ?? 0 });
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}
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return out;
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}
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