#22

src/app/services/user-input-service.ts

@@ -6,6 +6,60 @@ import dayjs from 'dayjs';
 	providedIn: 'root',
 })
 export class UserInputService {
+	private restoreDate(value: unknown): Date {
+		if (typeof value === 'string' && /^\d{4}-\d{2}-\d{2}$/.test(value)) {
+			const date = new Date(`${value}T00:00:00`);
+			if (dayjs(date).format('YYYY-MM-DD') === value) return date;
+		}
+		throw new Error('Unsupported saved balance date.');
+	}
+
+	private getSavedValues(): VacDay[] | undefined {
+		let stored: string | null = null;
+		try {
+			if (typeof localStorage === 'undefined') return;
+			stored = localStorage.getItem('leaveBalances');
+			if (stored === null) return;
+			const saved: unknown = JSON.parse(stored);
+			if (!Array.isArray(saved)) throw new Error('Saved leave balances must be a list.');
+			return saved.map((value: unknown) => {
+				if (typeof value !== 'object' || value === null)
+					throw new Error('Unsupported saved balance record.');
+				const { id, type, numberOfDays, availableDate, expiryDate } = value as Record<
+					string,
+					unknown
+				>;
+				if (
+					typeof id !== 'string' ||
+					typeof numberOfDays !== 'number' ||
+					!Number.isFinite(numberOfDays) ||
+					(type !== SelectableDayType.CP &&
+						type !== SelectableDayType.RTT &&
+						type !== SelectableDayType.OTHER)
+				)
+					throw new Error('Unsupported saved balance record.');
+				return {
+					id,
+					type,
+					numberOfDays,
+					availableDate:
+						availableDate === undefined ? undefined : this.restoreDate(availableDate),
+					expiryDate: this.restoreDate(expiryDate),
+				};
+			});
+		} catch (error) {
+			console.warn('Failed to restore leave balances from localStorage.', error);
+			if (stored !== null) {
+				try {
+					localStorage.removeItem('leaveBalances');
+				} catch {
+					// Keep the random fallback usable when browser storage is unavailable.
+				}
+			}
+		}
+		return undefined;
+	}
+
 	private getRandomNumber(): number {
 		return Math.floor(Math.random() * 11) + 10;
 	}
@@ -48,7 +102,9 @@ export class UserInputService {
 		};
 	}
 
-	readonly vacationNumberSignal = signal<VacDay[]>(this.getInitialValues());
+	readonly vacationNumberSignal = signal<VacDay[]>(
+		this.getSavedValues() ?? this.getInitialValues(),
+	);
 	readonly remainingVacationDaysSignal = signal<VacDay[]>([]);
 	readonly computeTriggerSignal = signal(0);