From 6d69c7b1e6a8051338e052cc9d1836f4f1a20f51 Mon Sep 17 00:00:00 2001
From: Martin Kagamino Lehoux <martin@lehoux.net>
Date: Tue, 8 Sep 2026 15:53:07 +0200
Subject: Late only after a full missed period

Status buckets shift a full period out: due until an occurrence is
skipped entirely, late after one, very late after two. Health decay
halves (100 - ratio*50) so 50 marks late and 0 marks veryLate.
---
 src/lib/shared/routine-metrics.ts | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

(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 891a0c9..cffeb85 100644
--- a/src/lib/shared/routine-metrics.ts
+++ b/src/lib/shared/routine-metrics.ts
@@ -39,7 +39,7 @@ export interface RoutineState {
 	/** Time past due, in units of the routine's own frequency (0 if not due). */
 	overdueRatio: number;
 	status: RoutineStatus;
-	/** 100 on schedule, 0 when overdue by a full frequency, floor at 0. */
+	/** 100 on schedule, 50 when a full period overdue, 0 at two periods, floor at 0. */
 	health: number;
 }
 
@@ -61,17 +61,17 @@ export function computeRoutineState(
 	const dueMs = startOfUtcDay(referenceMs) + periodMs;
 	const rawRatio = (now - dueMs) / periodMs;
 	const overdueRatio = Math.max(0, rawRatio);
-	// Buckets on overdue time in units of the routine's own frequency:
-	// not due / due now / late (half a period overdue) / very late (a full
-	// period overdue — a weekly routine two weeks old lands here).
+	// Buckets on overdue time in units of the routine's own frequency: due
+	// until a full period is missed (a daily done yesterday is due today, not
+	// late), late once an occurrence was skipped entirely, very late after two.
 	// A routine that was never done is always at least due: there is
 	// something to do, even right after creation.
 	const status: RoutineStatus =
 		rawRatio < 0 && lastDoneMs !== null
 			? 'ok'
-			: overdueRatio < 0.5
+			: overdueRatio < 1
 				? 'due'
-				: overdueRatio < 1
+				: overdueRatio < 2
 					? 'late'
 					: 'veryLate';
 
@@ -85,7 +85,7 @@ export function computeRoutineState(
 		overdueDays: Math.floor(overdueRatio * routine.frequencyDays),
 		overdueRatio,
 		status,
-		health: Math.max(0, Math.round(100 - overdueRatio * 100)),
+		health: Math.max(0, Math.round(100 - overdueRatio * 50)),
 	};
 }
 
@@ -107,12 +107,13 @@ export interface HealthPoint {
 function healthAtPoint(refMs: number, periodMs: number, t: number): number {
 	const dueMs = startOfUtcDay(refMs) + periodMs;
 	const rawRatio = (t - dueMs) / periodMs;
-	return Math.max(0, Math.round(100 - Math.max(0, rawRatio) * 100));
+	return Math.max(0, Math.round(100 - Math.max(0, rawRatio) * 50));
 }
 
 /**
  * Daily health samples from the routine's creation to now: 100 right after a
- * completion, then a linear decay to 0 once a full period is overdue (sawtooth).
+ * completion, then a linear decay to 0 once two full periods are overdue
+ * (sawtooth).
  * Each sample anchors on the latest completion at or before it (or creation).
  * Uses the routine's current frequency across the whole history.
  */
-- 
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