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Marc-André Bombeck
170862fdf8
The per-metric target editor receives a glucose range already projected into the user's display unit (mmol/L) along with `unit="mmol/L"`, but it seeded, validated and saved that value verbatim. HealthLog stores glucose canonically in mg/dL, so a user on the mmol/L preference either had a valid target (e.g. 3.9–5.5 mmol/L) rejected by the 40–400 mg/dL bounds, or — when an override already existed — saw a mg/dL number rendered as if it were mmol/L and wrote it straight back. Add `mmolToMgdl` / `toCanonicalMgdl` (the inverse of `convertGlucose`) and teach the edit sheet to treat the display unit at its boundary: seed the persisted mg/dL override into the display unit, validate against bounds expressed in the display unit, and convert the typed value back to canonical mg/dL before the PUT. A no-op for every non-glucose metric and for users on the mg/dL preference. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> (cherry picked from commit 0cc0361058a85f32d7135e5f2fd425c98f62d885)
65 lines
2.0 KiB
TypeScript
65 lines
2.0 KiB
TypeScript
/**
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* Blood-glucose unit conversions.
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*
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* HealthLog stores glucose canonically in **mg/dL**. The UI can display in
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* mmol/L for users who prefer that (SI-unit countries). Conversion factor is
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* 18.0182 (per DGIM / DDG S3 guideline). We round to clinically meaningful
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* precision: 0 fractional digits for mg/dL, 1 for mmol/L.
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*/
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export type GlucoseUnit = "mg/dL" | "mmol/L";
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const MGDL_PER_MMOL = 18.0182;
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export function mgdlToMmol(mgdl: number): number {
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return Math.round((mgdl / MGDL_PER_MMOL) * 10) / 10;
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}
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export function mmolToMgdl(mmol: number): number {
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return Math.round(mmol * MGDL_PER_MMOL);
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}
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export function convertGlucose(value: number, to: GlucoseUnit): number {
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return to === "mmol/L" ? mgdlToMmol(value) : Math.round(value);
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}
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/**
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* Convert a value the user typed in their display unit back to the
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* canonical mg/dL HealthLog stores. The inverse of {@link convertGlucose}
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* for the editor write path: a `5.5 mmol/L` target the user enters must
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* persist as `99 mg/dL`, not as the literal `5.5`. A `mg/dL` display unit
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* is already canonical, so it only rounds.
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*/
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export function toCanonicalMgdl(value: number, from: GlucoseUnit): number {
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return from === "mmol/L" ? mmolToMgdl(value) : Math.round(value);
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}
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export function resolveGlucoseUnit(
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userPreference: string | null | undefined,
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): GlucoseUnit {
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return userPreference === "mmol/L" ? "mmol/L" : "mg/dL";
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}
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/**
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* Threshold metric key corresponding to a glucose context. Keeps the
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* effective-range resolver the single source of truth.
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*/
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export function thresholdMetricForContext(
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context: "FASTING" | "POSTPRANDIAL" | "RANDOM" | "BEDTIME",
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):
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| "BLOOD_GLUCOSE_FASTING"
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| "BLOOD_GLUCOSE_POSTPRANDIAL"
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| "BLOOD_GLUCOSE_RANDOM"
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| "BLOOD_GLUCOSE_BEDTIME" {
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switch (context) {
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case "FASTING":
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return "BLOOD_GLUCOSE_FASTING";
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case "POSTPRANDIAL":
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return "BLOOD_GLUCOSE_POSTPRANDIAL";
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case "RANDOM":
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return "BLOOD_GLUCOSE_RANDOM";
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case "BEDTIME":
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return "BLOOD_GLUCOSE_BEDTIME";
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}
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}
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