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https://github.com/MBombeck/HealthLog.git
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Marc-André Bombeck
f3a4da50f6
The glucose UI only converts canonical mg/dL into mmol/L for display via convertGlucose; the reverse helper had no caller outside its own test. The Berlin-only day-key helper was already superseded by userDayKey(date, tz) in v1.4.38 for every read path that consumed it; its remaining presence as a tested module was dead weight.
50 lines
1.4 KiB
TypeScript
50 lines
1.4 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 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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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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