const normalize = (value) => value == null || value === 'null' || value === 'undefined' ? '' : String(value);

export const getSheetVisitId = (sheet, direction, year) => JSON.stringify([sheet, normalize(direction), normalize(year)]);

export const rememberSheetVisit = (kind, parentId, sheet, direction, year) => {
	try {
		sessionStorage.setItem(`last-sheet:${kind}:${parentId}`, getSheetVisitId(sheet, direction, year));
	} catch { /* The sheet remains available when browser storage is disabled. */ }
};

export const readSheetVisit = (kind, parentId) => {
	try {
		return sessionStorage.getItem(`last-sheet:${kind}:${parentId}`);
	} catch { return null; }
};