/** Browser persistence is optional; the current selection remains usable without it. */
const selectionKey = 'investment-opportunity-selection';
export function readOpportunitySelection(): number[] {
    try {
        const value: unknown = JSON.parse(
            sessionStorage.getItem(selectionKey) ?? '[]',
        );
        if (!Array.isArray(value)) return [];
        return [
            ...new Set(
                value.filter(
                    (id): id is number =>
                        typeof id === 'number' &&
                        Number.isSafeInteger(id) &&
                        id > 0,
                ),
            ),
        ];
    } catch {
        return [];
    }
}
export function persistOpportunitySelection(ids: number[]): boolean {
    try {
        if (ids.length)
            sessionStorage.setItem(selectionKey, JSON.stringify(ids));
        else sessionStorage.removeItem(selectionKey);
        return true;
    } catch {
        return false;
    }
}