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Marc-André BombeckandClaude Opus 4.7
3048dd6637
Pre-existing format drift accumulated across v1.4.x; running prettier brings the whole tree back to baseline so future diffs read clean. No behaviour change. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
92 lines
3.3 KiB
TypeScript
92 lines
3.3 KiB
TypeScript
/**
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* v1.4.16 phase B8 — comparison overlay helper.
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*
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* The dashboard charts already fetch every measurement for the active
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* type set (paged through `/api/measurements`). When the comparison
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* toggle is active we re-use the SAME daily aggregates and shift them
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* forward by 30 days (lastMonth) or 365 days (lastYear) so the prior
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* period lines up with the current period on the visible x-axis.
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*
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* The shift is integer-day exact because the dashboard's daily bucket
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* keys live at UTC noon of each Berlin calendar day — adding or
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* subtracting 30 / 365 days at noon does NOT cross a DST boundary
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* (only 02:00-03:00 wall-clock crossings can flip the calendar day).
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*
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* Pure & deterministic: the helper takes the already-bucketed
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* `[timestamp, value]` rows the chart computes, and emits a parallel
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* series with timestamps shifted forward and values intact. The chart
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* then merges the two series by visible-day so a single Recharts
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* tooltip can render both at once.
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*/
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export type ComparisonShift = "lastMonth" | "lastYear";
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/** Days the shift moves the prior period forward by. */
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export const COMPARISON_SHIFT_DAYS: Record<ComparisonShift, number> = {
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lastMonth: 30,
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lastYear: 365,
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};
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const MS_PER_DAY = 24 * 60 * 60 * 1000;
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/**
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* Shift a daily-aggregated series forward by the comparison span so
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* each prior-period point lines up with its current-period sibling on
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* the same visible x-axis position. The shift adds days, never
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* subtracts: a "last month" shift on a Jan 15 prior-period point lands
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* the resulting overlay row at Feb 14 — directly under the current Feb
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* 14 reading where the user expects to see the comparison.
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*
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* Empty input → empty output. The chart's empty-state then handles
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* "Comparison unavailable — no data from last month yet" without the
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* helper having to know about i18n.
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*/
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export function shiftDailySeriesForward<T extends { timestamp: number }>(
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rows: T[],
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shift: ComparisonShift,
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): T[] {
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const days = COMPARISON_SHIFT_DAYS[shift];
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return rows.map((row) => ({
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...row,
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timestamp: row.timestamp + days * MS_PER_DAY,
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}));
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}
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/**
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* Compute the average value of a numeric series over the entire window.
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* Returns null when the series has no points so the caller can render
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* "comparison unavailable" instead of a misleading 0.
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*
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* Used by the tile delta callout: each tile sums the current-period
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* average and the prior-period average so the difference is what the
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* user sees in the chart, not a single-day cherry-pick.
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*/
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export function averageValue(
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values: Array<number | null | undefined>,
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): number | null {
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let sum = 0;
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let n = 0;
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for (const v of values) {
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if (typeof v === "number" && Number.isFinite(v)) {
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sum += v;
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n += 1;
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}
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}
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if (n === 0) return null;
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return sum / n;
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}
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/**
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* Compute the delta between the current-period average and the prior-
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* period average. Returns null when either side is missing data so the
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* caller can render the unavailable fallback. Otherwise returns
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* `current - prior` as a signed number — sign convention matches the
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* dashboard's existing trend arrows (positive = up).
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*/
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export function computeComparisonDelta(
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current: number | null,
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prior: number | null,
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): number | null {
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if (current === null || prior === null) return null;
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return current - prior;
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}
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