6a75db0aae
Session count alone says nothing about consistency, which is what makes pelvic floor training work. Record every completion timestamp and derive streaks from local calendar days: current streak (survives until a full day is missed), best streak, and a 14-day dot strip on the home screen. The done screen now shows the streak so finishing is rewarded. - src/lib/streak.ts: pure day-key / streak logic, covered by node --test - store: new `sessions` array, defaulted for pre-existing installs - home: StreakCard, screen now scrolls for smaller phones - tsconfig: TS 6 no longer auto-includes @types, so declare node types Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
57 lines
1.9 KiB
TypeScript
57 lines
1.9 KiB
TypeScript
// Pure streak logic over local calendar days — no React, no storage. Days are
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// "YYYY-MM-DD" keys in the device's local time zone, so a session at 23:50
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// counts for the day it was actually done, not the UTC one.
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export type DayKey = string;
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export function dayKey(date: Date): DayKey {
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const y = date.getFullYear();
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const m = String(date.getMonth() + 1).padStart(2, "0");
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const d = String(date.getDate()).padStart(2, "0");
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return `${y}-${m}-${d}`;
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}
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/** Local-midnight Date for a day key. */
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export function fromKey(key: DayKey): Date {
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const [y, m, d] = key.split("-").map(Number);
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return new Date(y, m - 1, d);
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}
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function shiftKey(key: DayKey, days: number): DayKey {
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const date = fromKey(key);
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date.setDate(date.getDate() + days);
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return dayKey(date);
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}
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/** Unique, ascending day keys from a list of ISO session timestamps. */
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export function sessionDays(sessionsIso: string[]): DayKey[] {
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return Array.from(new Set(sessionsIso.map((iso) => dayKey(new Date(iso))))).sort();
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}
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/** The last `n` day keys ending on `today`, oldest first. */
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export function lastNDays(n: number, today: DayKey): DayKey[] {
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const out: DayKey[] = [];
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for (let i = n - 1; i >= 0; i--) out.push(shiftKey(today, -i));
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return out;
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}
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/**
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* Current streak = consecutive trained days ending today or yesterday (a
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* streak isn't broken until a full day is missed). Best = longest run ever.
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*/
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export function computeStreaks(days: DayKey[], today: DayKey): { current: number; best: number } {
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const sorted = Array.from(new Set(days)).sort();
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if (sorted.length === 0) return { current: 0, best: 0 };
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let best = 1;
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let run = 1;
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for (let i = 1; i < sorted.length; i++) {
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run = shiftKey(sorted[i - 1], 1) === sorted[i] ? run + 1 : 1;
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if (run > best) best = run;
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}
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const last = sorted[sorted.length - 1];
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const alive = last === today || last === shiftKey(today, -1);
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return { current: alive ? run : 0, best };
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}
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