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// Pure routine metrics, shared by server services and UI. No db access.
// All timestamps are ISO strings; all math is done in ms then converted to days.
// Due dates anchor on UTC calendar days, not exact 24h intervals: a daily
// routine done yesterday is due today, whatever the time of day.
const DAY_MS = 24 * 60 * 60 * 1000;
/** Midnight UTC starting the calendar day containing ms. */
function startOfUtcDay(ms: number): number {
const d = new Date(ms);
return Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate());
}
export type RoutineStatus = 'ok' | 'due' | 'late' | 'veryLate';
export interface RoutineInput {
id: number;
version: number;
name: string;
frequencyDays: number;
createdAt: string;
}
export interface CompletionInput {
routineId: number;
doneAt: string;
}
export interface RoutineState {
id: number;
version: number;
name: string;
frequencyDays: number;
lastDoneAt: string | null;
/** When the routine should next be done. */
dueAt: string;
/** Days past dueAt (0 if not yet due). */
overdueDays: number;
/** 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. */
health: number;
}
export function computeRoutineState(
routine: RoutineInput,
completions: CompletionInput[],
now: number,
): RoutineState {
const mine = completions
.filter((c) => c.routineId === routine.id)
.map((c) => Date.parse(c.doneAt));
const lastDoneMs = mine.length > 0 ? Math.max(...mine) : null;
const createdMs = Date.parse(routine.createdAt);
const referenceMs =
lastDoneMs ?? (Number.isFinite(createdMs) ? createdMs : now);
const periodMs = routine.frequencyDays * DAY_MS;
// Calendar-day anchor: the period starts at midnight of the reference day,
// so any new calendar day past the frequency flips the routine to due.
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).
const status: RoutineStatus =
rawRatio < 0
? 'ok'
: overdueRatio < 0.5
? 'due'
: overdueRatio < 1
? 'late'
: 'veryLate';
return {
id: routine.id,
version: routine.version,
name: routine.name,
frequencyDays: routine.frequencyDays,
lastDoneAt: lastDoneMs !== null ? new Date(lastDoneMs).toISOString() : null,
dueAt: new Date(dueMs).toISOString(),
overdueDays: Math.floor(overdueRatio * routine.frequencyDays),
overdueRatio,
status,
health: Math.max(0, Math.round(100 - overdueRatio * 100)),
};
}
/** Average health across routines; 100 when there is nothing to do. */
export function computeHealthScore(states: { health: number }[]): number {
if (states.length === 0) return 100;
const total = states.reduce((sum, s) => sum + s.health, 0);
return Math.round(total / states.length);
}
export interface HealthPoint {
/** Epoch ms of the sample. */
at: number;
/** Health (0-100) at that instant. */
health: number;
}
/**
* 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).
* Each sample anchors on the latest completion at or before it (or creation).
* Uses the routine's current frequency across the whole history.
*/
export function computeHealthSeries(
routine: RoutineInput,
completions: CompletionInput[],
now: number,
): HealthPoint[] {
const createdMs = Date.parse(routine.createdAt);
const startMs = Number.isFinite(createdMs) ? createdMs : now;
const periodMs = routine.frequencyDays * DAY_MS;
const completionMs = completions
.filter((c) => c.routineId === routine.id)
.map((c) => Date.parse(c.doneAt))
.sort((a, b) => a - b);
const points: HealthPoint[] = [];
if (now <= startMs) {
return [{ at: now, health: 100 }];
}
// Reference anchor: latest completion at-or-before the sampled instant.
let refMs = startMs;
let nextCompletion = 0;
const sampleAt = (t: number): number => {
while (
nextCompletion < completionMs.length &&
completionMs[nextCompletion] <= t
) {
refMs = completionMs[nextCompletion];
nextCompletion++;
}
const dueMs = startOfUtcDay(refMs) + periodMs;
const rawRatio = (t - dueMs) / periodMs;
return Math.max(0, Math.round(100 - Math.max(0, rawRatio) * 100));
};
for (let t = startMs; t <= now; t += DAY_MS) {
points.push({ at: t, health: sampleAt(t) });
}
// Final unaligned sample so the curve ends at the present instant.
if (points[points.length - 1].at < now) {
points.push({ at: now, health: sampleAt(now) });
}
return points;
}
export function formatFrequency(days: number): string {
if (days === 1) return 'chaque jour';
if (days === 7) return 'chaque semaine';
if (days === 30) return 'chaque mois';
if (days === 365) return 'chaque année';
return `tous les ${days} jours`;
}
const UNIT_DAYS: Record<string, number> = { d: 1, w: 7, m: 30, y: 365 };
/** Parses "1d | 2w | 3m | 1y" into days; returns null when invalid. */
export function parseIntervalToDays(input: string): number | null {
const match = input
.trim()
.toLowerCase()
.match(/^(\d+)([dwmy])$/);
if (!match) return null;
const days = Number(match[1]) * UNIT_DAYS[match[2]];
return days >= 1 ? days : null;
}
export const STATUS_LABELS: Record<RoutineStatus, string> = {
ok: 'À jour',
due: 'À faire',
late: 'En retard',
veryLate: 'Très en retard',
};
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