From 0bab369a6bc6a64bfd8fedd577e69eb27bfb1178 Mon Sep 17 00:00:00 2001
From: Martin Kagamino Lehoux <martin@lehoux.net>
Date: Mon, 5 Oct 2026 07:37:35 +0200
Subject: Show time since done or lateness instead of the last-done date

---
 src/lib/shared/routine-metrics.ts | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'src/lib/shared/routine-metrics.ts')

diff --git a/src/lib/shared/routine-metrics.ts b/src/lib/shared/routine-metrics.ts
index d3c1470..4417539 100644
--- a/src/lib/shared/routine-metrics.ts
+++ b/src/lib/shared/routine-metrics.ts
@@ -38,6 +38,15 @@ function maxInstant(instants: Temporal.Instant[]): Temporal.Instant | null {
 	);
 }
 
+/** Whole UTC-calendar days from an instant to now, floored at 0. */
+function daysAgo(then: Temporal.Instant, now: Temporal.Instant): number {
+	const days = then
+		.toZonedDateTimeISO(UTC)
+		.toPlainDate()
+		.until(now.toZonedDateTimeISO(UTC).toPlainDate()).days;
+	return Math.max(0, days);
+}
+
 function parseCompletions(
 	routineId: number,
 	completions: CompletionInput[],
@@ -75,6 +84,8 @@ export interface RoutineState {
 	/** Spec text, as stored. */
 	frequency: string;
 	lastDoneAt: string | null;
+	/** Whole UTC-calendar days since lastDoneAt (null when never done). */
+	daysSinceDone: number | null;
 	/** When the pending obligation must be done (window end for quotas). */
 	dueAt: string;
 	/** Days past dueAt (0 while the deadline is still ahead). */
@@ -131,6 +142,7 @@ export function computeRoutineState(
 		name: routine.name,
 		frequency: routine.frequency,
 		lastDoneAt: lastDone !== null ? iso(lastDone) : null,
+		daysSinceDone: lastDone !== null ? daysAgo(lastDone, now) : null,
 		dueAt: iso(due),
 		overdueDays: Math.floor(overdueRatio * days),
 		overdueRatio,
@@ -223,6 +235,7 @@ function quotaState(
 		name: routine.name,
 		frequency: routine.frequency,
 		lastDoneAt: lastDone !== null ? iso(lastDone) : null,
+		daysSinceDone: lastDone !== null ? daysAgo(lastDone, now) : null,
 		dueAt: iso(due),
 		overdueDays: Math.max(
 			0,
@@ -396,3 +409,17 @@ export const STATUS_LABELS: Record<RoutineStatus, string> = {
 	late: 'En retard',
 	veryLate: 'Très en retard',
 };
+
+/** Meta stamp next to the frequency: lateness past due, else time since done. */
+export function formatDoneAge(
+	state: Pick<RoutineState, 'daysSinceDone' | 'overdueDays'>,
+): string {
+	if (state.overdueDays > 0) {
+		const n = state.overdueDays;
+		return `${n} jour${n > 1 ? 's' : ''} de retard`;
+	}
+	if (state.daysSinceDone === null) return 'jamais fait';
+	if (state.daysSinceDone === 0) return "fait aujourd'hui";
+	if (state.daysSinceDone === 1) return 'fait hier';
+	return `fait il y a ${state.daysSinceDone} jours`;
+}
-- 
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